EAGLE GEOPHYICAL INC
S-1/A, 1997-06-25
OIL & GAS FIELD EXPLORATION SERVICES
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<PAGE>   1
 
   
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JUNE 25, 1997
    
 
                                                      REGISTRATION NO. 333-28303
================================================================================
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
   
                                AMENDMENT NO. 2
    
                                       TO
                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
 
                            EAGLE GEOPHYSICAL, INC.
             (Exact name of registrant as specified in its charter)
 
<TABLE>
<C>                              <C>                              <C>
            DELAWARE                           1382                          76-0522659
(State or other jurisdiction of    (Primary Standard Industrial           (I.R.S. Employer
 incorporation or organization)    Classification Code Number)          Identification No.)
</TABLE>
 
                              50 BRIAR HOLLOW LANE
                                 6TH FLOOR WEST
                              HOUSTON, TEXAS 77027
                                 (713) 627-1990
         (Address, including zip code, and telephone number, including
            area code, of registrant's principal executive offices)
 
                          JAY N. SILVERMAN, PRESIDENT
                            EAGLE GEOPHYSICAL, INC.
                              50 BRIAR HOLLOW LANE
                                 6TH FLOOR WEST
                              HOUSTON, TEXAS 77027
                                 (713) 627-1990
           (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)
 
                                   Copies to:
 
<TABLE>
<C>                                              <C>
               N. L. STEVENS III
                 W. MARK YOUNG                                  JOSEPH W. ARMBRUST
      GARDERE WYNNE SEWELL & RIGGS, L.L.P.                       BROWN & WOOD LLP
           333 CLAY AVENUE, SUITE 800                         ONE WORLD TRADE CENTER
              HOUSTON, TEXAS 77002                           NEW YORK, NEW YORK 10048
                 (713) 308-5500                                   (212) 839-5300
</TABLE>
 
     APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after the effective date of this Registration Statement.
 
     If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box.  [ ]
 
     If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  [ ]
 
     If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  [ ]
 
     If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  [ ]
 
     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
 
================================================================================
<PAGE>   2
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
     The Registrant estimates that expenses in connection with the Offering
described in this Registration Statement will be as follows. All of the amounts
except the SEC registration fee, NASD fee and the Nasdaq National Market listing
fee are estimates.
 
<TABLE>
<CAPTION>
                            ITEM                              AMOUNT
                            ----                              -------
<S>                                                           <C>
SEC registration fee........................................  $30,750
NASD fee....................................................   10,500
Nasdaq National Market listing fee..........................   39,005
Legal fees and expenses.....................................       **
Accounting fees and expenses................................       **
Printing expenses...........................................       **
Fees and expenses for qualification under state securities
  laws (including legal fees)...............................       **
Transfer agent's and registrar's fees and expenses..........       **
Miscellaneous...............................................       **
                                                              -------
          Total.............................................  $     *
                                                              =======
</TABLE>
 
- ---------------
 
 * None of this amount is to be borne by the Selling Stockholder.
** To be filed by amendment.
 
ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
     The Registrant is incorporated under the laws of Delaware. Section 145 of
the Delaware General Corporation Law provides that a Delaware corporation may
indemnify any person against expenses, fines and settlements actually and
reasonably incurred by any such person in connection with a threatened, pending
or completed action, suit or proceeding in which he is involved by reason of the
fact that he is or was a director, officer, employee or agent of such
corporation, provided that (i) he acted in good faith and in a manner he
reasonably believed to be in or not opposed to the best interests of the
corporation and (ii) with respect to any criminal action or proceeding, he had
no reasonable cause to believe his conduct was unlawful. If the action or suit
is by or in the name of the corporation, the corporation may indemnify any such
person against expenses actually and reasonably incurred by him in connection
with the defense or settlement of such action or suit if he acted in good faith
and in a manner he reasonably believed to be in or not opposed to the best
interest of the corporation, except that no indemnification may be made in
respect to any claim, issue or matter as to which such person shall have been
adjudged to be liable for negligence or misconduct in the performance of his
duty to the corporation, unless and only to the extent that the Delaware Court
of Chancery or the court in which the action or suit is brought determines upon
application that, despite the adjudication of liability but in light of the
circumstances of the case, such person is fairly and reasonably entitled to
indemnity for such expenses as the court deems proper.
 
     As permitted by the Delaware General Corporation Law, the Registrants'
Certificate of Incorporation provides that the directors and officers of the
Registrant shall be indemnified by the Registrant against certain liabilities
that those persons may incur in their capacities as directors or officers. The
Certificate of Incorporation eliminates the liability of directors of the
Registrant, under certain circumstances, to the maximum extent permitted by the
Delaware General Corporation Law. See "Description of Capital Stock -- Special
Provisions of the Certificate of Incorporation and By-laws" included in the
Prospectus.
 
     The Underwriting Agreement to be filed as Exhibit 1.1 hereto contains
reciprocal agreements of indemnity between the Registrant and the underwriters
as to certain liabilities, including liabilities under the Securities Act of
1933, as amended (the "Securities Act"), and in certain circumstances provides
for indemnification of the Registrant's directors and officers.
 
                                      II-1
<PAGE>   3
 
ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES.
 
     During the previous three years, the Registrant has issued and sold the
following securities without registration under the Securities Act (none of
which sales were underwritten):
 
     The Company was formed in December 1996, at which time it issued 1,000 of
its shares of Common Stock for a cash purchase price of $1.00 per share to the
Selling Stockholder. Such issuance of shares was exempt from registration under
the Securities Act pursuant to Section 4(2) thereof as a transaction by the
issuer not involving any public offering.
 
     On May 22, 1997, the Company effected a stock split pursuant to which the
1,000 outstanding shares of Common Stock were subdivided into 3,400,000 shares
of Common Stock. All such shares were issued to the Selling Stockholder as sole
stockholder of the Company. Such issuance was exempt from registration under the
Securities Act pursuant to Section 3(a)(9) thereof as securities exchanged by
the issuer with its existing security holders exclusively where no commission or
other remuneration was given directly or indirectly for soliciting such
exchange.
 
     Prior to consummation of the Offering, the Company intends to issue 25,000
shares of Common Stock to Jay N. Silverman, President of the Company, at a
purchase price equal to the initial public offering price. Such purchase price
will be paid by delivery to the Company of a promissory note by Mr. Silverman.
This issuance of shares will be exempt from registration under the Securities
Act pursuant to Section 4(2) thereof as a transaction by the issuer not
involving any public offering.
 
     Pursuant to an agreement dated June 2, 1997, contemporaneously with the
consummation of the Offering, the Company will issue an aggregate of 600,000
shares of Common Stock to Oliveira Limited, Dormera Limited, Balmedie Limited,
and Larlane Limited in exchange for the 81.0% of the outstanding shares of
Energy Research International owned by such entities. Gerald Harrison, George
Purdie, Neil Campbell, and David Burns, all of whom will be directors, officers
or employees of the Company after the consummation of the Offering, own all of
the issued and outstanding shares of Oliveira Limited, Dormera Limited, Balmedie
Limited, and Larlane Limited, respectively. This issuance of shares will be
exempt from registration under the Securities Act pursuant to Section 4(2)
thereof as a transaction by the issuer not involving any public offering.
 
ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.
 
     (a) Exhibits
 
   
<TABLE>
<CAPTION>
      EXHIBIT NO.                                DESCRIPTION
      -----------                                -----------
<C>                      <S>
         1.1**           -- Form of Underwriting Agreement
         2.1**           -- Stock Purchase Agreement dated June 2, 1997, among Gerald
                            Harrison, George Purdie, Neil Campbell, David Burns,
                            Olivera Limited, Dormera Limited, Balmedie Limited,
                            Larlane Limited and Registrant
         3.1**           -- Certificate of Incorporation, as amended
         3.2**           -- Amended and Restated Bylaws
         4.1*            -- Specimen Certificate for Registrant's common stock, par
                            value $0.01
         5.1*            -- Form of opinion of Gardere Wynne Sewell & Riggs, L.L.P.
        10.1.1           -- Loan and Security Agreement dated July 9, 1996, between
                            Seitel Geophysical, Inc., as Debtor, and Nationsbanc
                            Leasing Corporation of North Carolina, as Secured Party
        10.1.2           -- Assumption and Consent dated December 31, 1996, among
                            Seitel Geophysical, Inc., Eagle Geophysical, Inc.,
                            Nationsbanc Leasing Corporation of North Carolina and
                            Seitel, Inc.
        10.2             -- Loan and Security Agreement dated February 6, 1997,
                            between Eagle Geophysical, Inc., as Debtor, and
                            Nationsbanc Leasing Corporation of North Carolina, as
                            Secured Party
</TABLE> 
    
 
                                      II-2
<PAGE>   4
   
<TABLE>
<CAPTION>
      EXHIBIT NO.                                DESCRIPTION
      -----------                                -----------
<C>                      <S>
        10.3             -- Conditional Sales Agreement dated February 19, 1997,
                            between Input/Output, Inc. and Horizon Exploration
                            Limited ("HEL")
        10.4.1           -- Installment Note ($306,180) by HEL in favor of Teledyne
                            Brown Engineering Marine Products
        10.4.2           -- Promissory Note ($330,000) by HEL in favor of Teledyne
                            Industries, Inc.
        10.5.1           -- Loan and Security Agreement dated February 22, 1996,
                            between Seitel Geophysical, Inc. and MetLife Capital
                            Corporation
        10.5.2           -- Assignment and Assumption Agreement dated December 31,
                            1996 between Seitel Geophysical, Inc. and Eagle
                            Geophysical, Inc.
        10.6.1           -- Master Equipment Lease Agreement dated May 20, 1994,
                            between Seitel Geophysical, Inc. and MetLife Capital,
                            Limited Partnership, as amended
        10.6.2           -- Assignment and Assumption Agreement dated December 31,
                            1996 between Seitel Geophysical, Inc. and Eagle
                            Geophysical, Inc.
        10.7.1           -- Master Lease Agreement dated February 16, 1994 between
                            McCullagh Leasing (a unit of GE Capital Fleet Services)
                            and Seitel Geophysical, Inc., as amended
        10.7.2           -- Partial Assignment dated April 8, 1997 among Seitel
                            Geophysical, Inc., Eagle Geophysical, Inc. and GE Capital
                            Fleet Services
        10.8             -- Term Credit and Security Agreement dated July 15, 1993,
                            between Seitel Geophysical, Inc. and Compass Bank (f/k/a
                            Central Bank of the South), as amended
        10.9.1           -- Bareboat Charter by Way of Subdemise dated July 15, 1994,
                            between Simon-Horizon Limited ("Simon") and HEL
        10.9.2           -- Management Agreement dated December 19, 1990 between
                            Simon and Ervik Marine Services A/S ("Ervik")
        10.9.3           -- Side Letter Agreement dated December 19, 1990, between
                            Simon and Ervik
        10.9.4           -- Assignment Agreement Relating to a Ship Management
                            Agreement dated December 19, 1990 (as amended) dated July
                            15, 1990, between Simon and HEL
        10.9.5           -- Deed of Assignment of Insurances dated July 15, 1994,
                            between HEL and Simon
        10.9.6           -- Deed of Continuing Inter-Company Cross Guarantee and
                            Indemnity dated July 15, 1994, by Horizon Seismic Inc.,
                            Exploration Holdings Limited and HEL in favor of Simon,
                            Simon Petroleum Technology Limited and Simon Engineering
                            Plc
        10.9.7           -- Sublease Contract Number 1 dated July 15, 1994, between
                            Simon and HEL
        10.9.8           -- Sublease Contract Number 2 dated July 15, 1994, between
                            Simon and HEL
        10.9.9           -- Agreement dated July 15, 1994, among Simon, Simon
                            Petroleum Technology Limited, Simon Engineering Plc and
                            HEL
        10.9.10          -- Charterparty by way of Sub-Demise dated December 20,
                            1996, between Royal Bank of Scotland and Simon
        10.9.11          -- Addendum to Charterparty dated March 31, 1992, between
                            Royal Bank of Scotland and Simon
        10.9.12          -- Quadripartite Agreement dated August 18, 1994, among
                            Simon, Royal Bank of Scotland (Industrial Leasing)
                            Limited, HEL and Simon Engineering plc
        10.9.13          -- Master Leasing Agreement dated July 15, 1994 between
                            Simon and HEL
        10.10            -- Contribution and Assumption Agreement dated December 31,
                            1996, between Seitel Geophysical, Inc. and Eagle
                            Geophysical, Inc.
        10.11.1          -- Agreement to Extend the Charterparty of "Pacific Horizon"
                            dated July 11, 1994, by and between J. Marr Limited and
                            HEL
        10.11.2          -- Deed of Novation m.v. "Pacific Horizon" dated July 11,
                            1994, by and among Simon, J. Marr Limited and HEL
        10.11.3          -- Pacific Horizon Charter dated February 4, 1981, between
                            J. Marr and Son, Limited and HEL
        10.12            -- Employment Agreement between Exploration Holdings Limited
                            ("EHL") and Gerald Harrison, as amended
</TABLE>
    
 
                                      II-3
<PAGE>   5
   
<TABLE>
<CAPTION>
      EXHIBIT NO.                                DESCRIPTION
      -----------                                -----------
<C>                      <S>
        10.13            -- Employment Agreement between EHL and George Purdie, as
                            amended
        10.14            -- Employment Agreement between EHL and Neil A.M. Campbell,
                            as amended
        10.15            -- Form of Employment Agreement Amendment between EHL and
                            each of Messrs. Harrison, Purdie and Campbell
        10.16*           -- Form of Employment Agreement between Eagle Geophysical,
                            Inc. and Jay Silverman
        10.17            -- Employment Agreement between Eagle Geophysical, Inc. and
                            Richard McNairy
        10.18            -- Commercial Lease dated March 10, 1994, between Ron Chase
                            dba Chase Properties and Eagle Geophysical, Inc./Seitel
                            Geophysical, Inc.
        10.19            -- Modification and Ratification of Lease dated April 24,
                            1996, between Ron Chase dba Chase Properties and Eagle
                            Geophysical, Inc./Seitel Geophysical, Inc.
        10.20            -- Lease dated May 28, 1996, between Partnership of
                            Perkins-Guidry-Beazley-Ostteen and Seitel Geophysical,
                            Inc.
        10.21*           -- Form of Sublease between Seitel, Inc. and its
                            subsidiaries and Eagle Geophysical, Inc.
        10.22*           -- Form of Master Separation Agreement between Seitel, Inc.
                            and Eagle Geophysical, Inc.
        10.23            -- Form of Registration Rights Agreement between EHI
                            Holdings, Inc. and Eagle Geophysical, Inc.
        10.24*           -- Form of Tax Indemnity Agreement between Seitel, Inc. and
                            Eagle Geophysical, Inc.
        10.25            -- Form of Administrative Services Agreement between Seitel,
                            Inc. and Eagle Geophysical, Inc.
        10.26            -- Amended and Restated Promissory Note ($2,000,000) dated
                            July 3, 1996 by Energy Research International ("ERI") in
                            favor of Seitel, Inc.
        10.27            -- Promissory Note ($2,679,040) dated November 15, 1996 by
                            ERI in favor of Seitel, Inc.
        10.28*           -- Form of Bonus Agreement between Eagle Geophysical, Inc.
                            and Paul A. Frame
        10.29            -- Form of Outside Directors Deferred Compensation Plan
        10.30            -- Form of Independent Directors Stock Option Plan
        10.31            -- Form of Stock Option Plan
        10.32.1          -- Form of Promissory Note payable by Jay Silverman to Eagle
                            Geophysical, Inc.
        10.32.2          -- Form of Subscription Agreement between Eagle Geophysical,
                            Inc. and Jay N. Silverman
        10.32.3          -- Form of Security Agreement -- Pledge between Eagle
                            Geophysical, Inc. and Jay N. Silverman
        10.33.1          -- The Bank of N.T. Butterfield Term Loan Facility dated
                            February 27, 1995
        10.33.2          -- The Bank of N.T. Butterfield & Son Limited Facility
                            Letter dated August 23, 1994
        10.33.3          -- The Bank of N.T. Butterfield & Son Limited Amendment
                            Letter No. 1 dated February 3, 1995
        10.33.4          -- The Bank of N.T. Butterfield & Son Limited Amendment
                            Letter No. 2 dated February 19, 1996
        10.33.5          -- The Bank of N.T. Butterfield & Son Limited Letter dated
                            May 10, 1996
        10.33.6          -- The Bank of N.T. Butterfield & Son Limited Letter dated
                            May 19, 1997
        10.34.1*         -- Abshire Tide Blanket Time Charter dated February 9, 1996,
                            between Tidewater Marine, Inc. and Horizon Seismic Inc.
        10.34.2          -- Letter Agreement dated February 12, 1996 relating to
                            Abshire Tide Blanket Time Charter
        10.34.3          -- Tidewater Marine letter to Horizon Seismic, Inc. dated
                            September 19, 1996 regarding the letter agreement dated
                            February 12, 1996 governing the Time Charter of the MV
                            Abshire Tide
</TABLE>
    
 
                                      II-4
<PAGE>   6
   
<TABLE>
<CAPTION>
      EXHIBIT NO.                                DESCRIPTION
      -----------                                -----------
<C>                      <S>
        10.34.4          -- Tidewater Marine letter to Horizon Seismic, Inc. dated
                            March 25, 1996 regarding the letter agreement dated
                            February 12, 1996 governing the Time Charter of the MV
                            Abshire Tide
        10.35.1          -- Supplemental Security Agreement No. One dated February
                            22, 1996 between Seitel Geophysical, Inc. and MetLife
                            Capital Corporation
        10.35.2          -- Term Promissory Note ($433,000) dated March 14, 1996, by
                            Seitel Geophysical, Inc. in favor of MetLife Capital
                            Corporation
        10.36            -- Service Agreement for MV Discoverer dated April 12, 1994,
                            between Horizon Seismic, Inc. and Shanghai Bureau of
                            Marine Geological Survey, as amended
        10.37            -- Underlease dated April 21, 1997, between Payless
                            Properties Limited and HEL
        10.38            -- Lease Agreement between Pincay Oaks, Inc. and HEL
        10.39            -- Lease dated February 1, 1997, between Tuscan Property
                            Developments Limited and HEL
        10.40            -- Set-off and Charge dated August 30, 1994, between HEL and
                            The Bank of N.T. Butterfield & Son Limited
        10.41            -- Deed relating to 6 Pembroke Road Sevenoaks Kent dated
                            August 25, 1993, between Marley Waterproofing Limited and
                            HEL
        10.42            -- Debenture dated August 12, 1994, between HEL and The Bank
                            of N.T. Butterfield & Son Limited
        10.43            -- Chattel Mortgage between HEL and The Bank of N.T.
                            Butterfield & Son Limited
        10.44            -- Form of Employment Agreement between Eagle Geophysical
                            and David Burns.
        10.45            -- Operating Lease of Marine Seismic Equipment dated as of
                            July 1, 1996, between Seismic Geophysical, Inc. and HEL
        10.46            -- Assignment between HEL and The Bank of NT Butterfield &
                            Sons Limited
        10.47            -- Letter of Hypothecation and Pledge dated August 30, 1994,
                            between Seismic Exploration Ltd. and The Bank of N.T.
                            Butterfield & Son Limited
        10.48            -- Lease Agreement dated January 7, 1997, between DigiCOURSE
                            INC. and HEL
        10.49            -- Lease Agreement dated March 27, 1997, between DigiCOURSE
                            INC. and HEL
        10.50*           -- Initial Definitive Trust Deed -- Horizon Pension Plan
        10.51            -- Operating Lease dated February 3, 1997, between Eagle
                            Geophysical, Inc. and HEL
        10.52            -- Contribution Agreement dated as of May 30, 1997, between
                            Seitel, Inc. and Eagle Geophysical, Inc.
        10.53            -- Assignment of Life Insurance dated December 9, 1993
                            insuring G.M. Harrison.
        10.54            -- Lease dated December 12, 1995, between Newington Bricks
                            Limited and HEL
        10.55            -- Lease dated August 25, 1993, between Marley Waterproofing
                            Limited and HEL
        10.56*           -- Form of Master Agreement for Geophysical Services by and
                            between Eagle Geophysical Onshore, Inc. and Seitel Data,
                            Ltd.
        10.57*           -- Form of Master Agreement for Geophysical Services by and
                            between Eagle Geophysical Onshore, Inc. and DDD Energy,
                            Ltd.
        23.1**           -- Consent of Arthur Andersen LLP, Independent Public
                            Accountants
        23.2**           -- Consent of KPMG, Independent Public Accountants
        23.3             -- Consent of Gardere Wynne Sewell & Riggs, L.L.P.
                            (contained in exhibit 5.1 opinion)
        27**             -- Financial data schedule
</TABLE>
    
 
- ---------------
 
 * To be filed by amendment
 
** Previously filed
 
                                      II-5
<PAGE>   7
 
     (b) Financial Statement Schedules
 
     The following financial statement schedules are included in Part II of the
Registration Statement:
 
          None
 
     All other schedules are omitted because they are inapplicable or the
requested information is shown in the financial statements or noted therein.
 
ITEM 17. UNDERTAKINGS.
 
     (a) Insofar as indemnification for liabilities arising under the Securities
Act may be permitted to directors, officers and controlling persons of the
Registrant pursuant to the foregoing provisions, or otherwise, the Registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Securities Act
and is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Registrant of expenses
incurred or paid by a director, officer or controlling person of the Registrant
in the successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Securities Act and will be governed by the final
adjudication of such issue.
 
     (b) The undersigned Registrant hereby undertakes to provide to the
representatives of the underwriters at the closing specified in the Underwriting
Agreement certificates in such denominations and registered in such names as
required by the representatives of the underwriters to permit prompt delivery to
each purchaser.
 
     (c) The undersigned Registrant hereby undertakes that:
 
          (1) For purposes of determining any liability under the Securities
     Act, the information omitted from the form of prospectus filed as part of
     this Registration Statement in reliance upon Rule 430A and contained in a
     form of prospectus filed by the Registrant pursuant to Rule 424(b)(1) or
     (4) or 497(h) under the Securities Act shall be deemed to be part of this
     Registration Statement as of the time it was declared effective.
 
          (2) For the purpose of determining any liability under the Securities
     Act, each post-effective amendment that contains a form of prospectus shall
     be deemed to be a new registration statement relating to the securities
     offered therein, and the offering of such securities at that time shall be
     deemed to be the initial bona fide offering thereof.
 
     (d) If the Underwriters do not exercise their option to purchase additional
shares of Common Stock to cover over-allotments, if any, or if such option is
partially exercised, the Registrant hereby undertakes to file a post-effective
amendment to the Registration Statement deregistering all such shares as to
which such option shall not have been exercised.
 
                                      II-6
<PAGE>   8
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Amendment No. 2 to Registration Statement to be signed on
its behalf by the undersigned, thereunto duly authorized, in the City of
Houston, State of Texas, on the 25th day of June, 1997
    
 
                                    EAGLE GEOPHYSICAL, INC.
 
                                    By: /s/ JAY N. SILVERMAN
                                       -------------------------------------
                                       Jay N. Silverman
                                       President and Chief Executive Officer
 
                               POWER OF ATTORNEY
 
     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities and on the dates indicated.
 
   
<TABLE>
<CAPTION>
                      SIGNATURE                                     TITLE                     DATE
                      ---------                                     -----                     ----
<S>                                                    <C>                                <C>
 
                          *                            Chairman of the Board of           June 25, 1997
- -----------------------------------------------------  Directors
                  William L. Lurie
 

                /s/ JAY N. SILVERMAN                   President, Chief Executive         June 25, 1997
- -----------------------------------------------------  Officer and Director (Principal
                  Jay N. Silverman                     Executive Officer)
 
                          *                            Executive Vice President and       June 25, 1997
- -----------------------------------------------------  Director
                 Gerald M. Harrison
 
                          *                            Senior Vice                        June 25, 1997
- -----------------------------------------------------  President -- Offshore Operations
                    George Purdie                      and Director
 
               /s/ RICHARD W. MCNAIRY                  Vice President -- Chief            June 25, 1997
- -----------------------------------------------------  Financial Officer and Secretary
                 Richard W. McNairy                    (Principal Financial and
                                                       Accounting Officer)
 
                  /s/ PAUL A. FRAME                    Director                           June 25, 1997
- -----------------------------------------------------
                    Paul A. Frame
 
*By:          /s/ JAY N. SILVERMAN
- -----------------------------------------------------
                  Jay N. Silverman
                  Attorney-in-Fact
 
</TABLE>
    
 
                                      II-7
<PAGE>   9
                               INDEX TO EXHIBITS
 
   
<TABLE>
<CAPTION>
      EXHIBIT NO.                                DESCRIPTION
      -----------                                -----------
<S>                      <C>
          1.1**          -- Form of Underwriting Agreement
          2.1**          -- Stock Purchase Agreement dated June 2, 1997, among Gerald
                            Harrison, George Purdie, Neil Campbell, David Burns,
                            Olivera Limited, Dormera Limited, Balmedie Limited,
                            Larlane Limited and Registrant
          3.1**          -- Certificate of Incorporation, as amended
          3.2**          -- Amended and Restated Bylaws
          4.1*           -- Specimen Certificate for Registrant's common stock, par
                            value $0.01
          5.1*           -- Form of opinion of Gardere Wynne Sewell & Riggs, L.L.P.
         10.1.1          -- Loan and Security Agreement dated July 9, 1996, between
                            Seitel Geophysical, Inc., as Debtor, and Nationsbanc
                            Leasing Corporation of North Carolina, as Secured Party
         10.1.2          -- Assumption and Consent dated December 31, 1996, among
                            Seitel Geophysical, Inc., Eagle Geophysical, Inc.,
                            Nationsbanc Leasing Corporation of North Carolina and
                            Seitel, Inc.
         10.2            -- Loan and Security Agreement dated February 6, 1997,
                            between Eagle Geophysical, Inc., as Debtor, and
                            Nationsbanc Leasing Corporation of North Carolina, as
                            Secured Party
         10.3            -- Conditional Sales Agreement dated February 19, 1997,
                            between Input/Output, Inc. and Horizon Exploration
                            Limited ("HEL")
         10.4.1          -- Installment Note ($306,180) by HEL in favor of Teledyne
                            Brown Engineering Marine Products
         10.4.2          -- Promissory Note ($330,000) by HEL in favor of Teledyne
                            Industries, Inc.
         10.5.1          -- Loan and Security Agreement dated February 22, 1996,
                            between Seitel Geophysical, Inc. and MetLife Capital
                            Corporation
         10.5.2          -- Assignment and Assumption Agreement dated December 31,
                            1996 between Seitel Geophysical, Inc. and Eagle
                            Geophysical, Inc.
         10.6.1          -- Master Equipment Lease Agreement dated May 20, 1994,
                            between Seitel Geophysical, Inc. and MetLife Capital,
                            Limited Partnership, as amended
         10.6.2          -- Assignment and Assumption Agreement dated December 31,
                            1996 between Seitel Geophysical, Inc. and Eagle
                            Geophysical, Inc.
         10.7.1          -- Master Lease Agreement dated February 16, 1994 between
                            McCullagh Leasing (a unit of GE Capital Fleet Services)
                            and Seitel Geophysical, Inc., as amended
         10.7.2          -- Partial Assignment dated April 8, 1997 among Seitel
                            Geophysical, Inc., Eagle Geophysical, Inc. and GE Capital
                            Fleet Services
         10.8            -- Term Credit and Security Agreement dated July 15, 1993,
                            between Seitel Geophysical, Inc. and Compass Bank (f/k/a
                            Central Bank of the South), as amended
         10.9.1          -- Bareboat Charter by Way of Subdemise dated July 15, 1994,
                            between Simon-Horizon Limited ("Simon") and HEL
         10.9.2          -- Management Agreement dated December 19, 1990 between
                            Simon and Ervik Marine Services A/S ("Ervik")
         10.9.3          -- Side Letter Agreement dated December 19, 1990, between
                            Simon and Ervik
         10.9.4          -- Assignment Agreement Relating to a Ship Management
                            Agreement dated December 19, 1990 (as amended) dated July
                            15, 1990, between Simon and HEL
         10.9.5          -- Deed of Assignment of Insurances dated July 15, 1994,
                            between HEL and Simon
</TABLE>
    
<PAGE>   10
   
<TABLE>
<CAPTION>
      EXHIBIT NO.                                DESCRIPTION
      -----------                                -----------
<C>                      <S>
         10.9.6          -- Deed of Continuing Inter-Company Cross Guarantee and
                            Indemnity dated July 15, 1994, by Horizon Seismic Inc.,
                            Exploration Holdings Limited and HEL in favor of Simon,
                            Simon Petroleum Technology Limited and Simon Engineering
                            Plc
         10.9.7          -- Sublease Contract Number 1 dated July 15, 1994, between
                            Simon and HEL
         10.9.8          -- Sublease Contract Number 2 dated July 15, 1994, between
                            Simon and HEL
         10.9.9          -- Agreement dated July 15, 1994, among Simon, Simon
                            Petroleum Technology Limited, Simon Engineering Plc and
                            HEL
         10.9.10         -- Charterparty by way of Sub-Demise dated December 20,
                            1996, between Royal Bank of Scotland and Simon
         10.9.11         -- Addendum to Charterparty dated March 31, 1992, between
                            Royal Bank of Scotland and Simon
         10.9.12         -- Quadripartite Agreement dated August 18, 1994, among
                            Simon, Royal Bank of Scotland (Industrial Leasing)
                            Limited, HEL and Simon Engineering plc
         10.9.13         -- Master Leasing Agreement dated July 15, 1994 between
                            Simon and HEL
         10.10           -- Contribution and Assumption Agreement dated December 31,
                            1996, between Seitel Geophysical, Inc. and Eagle
                            Geophysical, Inc.
         10.11.1         -- Agreement to Extend the Charterparty of "Pacific Horizon"
                            dated July 11, 1994, by and between J. Marr Limited and
                            HEL
         10.11.2         -- Deed of Novation m.v. "Pacific Horizon" dated July 11,
                            1994, by and among Simon, J. Marr Limited and HEL
         10.11.3         -- Pacific Horizon Charter dated February 4, 1981, between
                            J. Marr and Son, Limited and HEL
         10.12           -- Employment Agreement between Exploration Holdings Limited
                            ("EHL") and Gerald Harrison, as amended
         10.13           -- Employment Agreement between EHL and George Purdie, as
                            amended
         10.14           -- Employment Agreement between EHL and Neil A.M. Campbell,
                            as amended
         10.15           -- Form of Employment Agreement Amendment between EHL and
                            each of Messrs. Harrison, Purdie and Campbell
         10.16*          -- Form of Employment Agreement between Eagle Geophysical,
                            Inc. and Jay Silverman
         10.17           -- Employment Agreement between Eagle Geophysical, Inc. and
                            Richard McNairy
         10.18           -- Commercial Lease dated March 10, 1994, between Ron Chase
                            dba Chase Properties and Eagle Geophysical, Inc./Seitel
                            Geophysical, Inc.
         10.19           -- Modification and Ratification of Lease dated April 24,
                            1996, between Ron Chase dba Chase Properties and Eagle
                            Geophysical, Inc./Seitel Geophysical, Inc.
         10.20           -- Lease dated May 28, 1996, between Partnership of
                            Perkins-Guidry-Beazley-Ostteen and Seitel Geophysical,
                            Inc.
         10.21*          -- Form of Sublease between Seitel, Inc. and its
                            subsidiaries and Eagle Geophysical, Inc.
         10.22*          -- Form of Master Separation Agreement between Seitel, Inc.
                            and Eagle Geophysical, Inc.
         10.23           -- Form of Registration Rights Agreement between EHI
                            Holdings, Inc. and Eagle Geophysical, Inc.
         10.24*          -- Form of Tax Indemnity Agreement between Seitel, Inc. and
                            Eagle Geophysical, Inc.
         10.25           -- Form of Administrative Services Agreement between Seitel,
                            Inc. and Eagle Geophysical, Inc.
         10.26           -- Amended and Restated Promissory Note ($2,000,000) dated
                            July 3, 1996 by Energy Research International ("ERI") in
                            favor of Seitel, Inc.
</TABLE>
    
<PAGE>   11
 
   
<TABLE>
<CAPTION>
      EXHIBIT NO.                                                DESCRIPTION
- ------------------------  ------------------------------------------------------------------------------------------
<C>                       <S>
          10.27           -- Promissory Note ($2,679,040) dated November 15, 1996 by ERI in favor of Seitel, Inc.
          10.28*          -- Form of Bonus Agreement between Eagle Geophysical, Inc. and Paul A. Frame
          10.29           -- Form of Outside Directors Deferred Compensation Plan
          10.30           -- Form of Independent Directors Stock Option Plan
          10.31           -- Form of Stock Option Plan
          10.32.1         -- Form of Promissory Note payable by Jay Silverman to Eagle Geophysical, Inc.
          10.32.2         -- Form of Subscription Agreement between Eagle Geophysical, Inc. and Jay N. Silverman
          10.32.3         -- Form of Security Agreement -- Pledge between Eagle Geophysical, Inc. and Jay N.
                             Silverman
          10.33.1         -- The Bank of N.T. Butterfield Term Loan Facility dated February 27, 1995
          10.33.2         -- The Bank of N.T. Butterfield & Son Limited Facility Letter dated August 23, 1994
          10.33.3         -- The Bank of N.T. Butterfield & Son Limited Amendment Letter No. 1 dated February 3,
                             1995
          10.33.4         -- The Bank of N.T. Butterfield & Son Limited Amendment Letter No. 2 dated February 19,
                             1996
          10.33.5         -- The Bank of N.T. Butterfield & Son Limited Letter dated May 10, 1996
          10.33.6         -- The Bank of N.T. Butterfield & Son Limited Letter dated May 19, 1997
          10.34.1*        -- Abshire Tide Blanket Time Charter dated February 9, 1996, between Tidewater Marine,
                             Inc. and Horizon Seismic Inc.
          10.34.2         -- Letter Agreement dated February 12, 1996 relating to Abshire Tide Blanket Time Charter
          10.34.3         -- Tidewater Marine letter to Horizon Seismic, Inc. dated September 19, 1996 regarding the
                             letter agreement dated February 12, 1996 governing the Time Charter of the MV Abshire
                             Tide
          10.34.4         -- Tidewater Marine letter to Horizon Seismic, Inc. dated March 25, 1996 regarding the
                             letter agreement dated February 12, 1996 governing the Time Charter of the MV Abshire
                             Tide
          10.35.1         -- Supplemental Security Agreement No. One dated February 22, 1996 between Seitel
                             Geophysical, Inc. and MetLife Capital Corporation
          10.35.2         -- Term Promissory Note ($433,000) dated March 14, 1996, by Seitel Geophysical, Inc. in
                             favor of MetLife Capital Corporation
          10.36           -- Service Agreement for MV Discoverer dated April 12, 1994, between Horizon Seismic, Inc.
                             and Shanghai Bureau of Marine Geological Survey, as amended
          10.37           -- Underlease dated April 21, 1997, between Payless Properties Limited and HEL
          10.38           -- Lease Agreement between Pincay Oaks, Inc. and HEL
          10.39           -- Lease dated February 1, 1997, between Tuscan Property Developments Limited and HEL
          10.40           -- Set-off and Charge dated August 30, 1994, between HEL and The Bank of N.T. Butterfield
                             & Son Limited
          10.41           -- Deed relating to 6 Pembroke Road Sevenoaks Kent dated August 25, 1993, between Marley
                             Waterproofing Limited and HEL
          10.42           -- Debenture dated August 12, 1994, between HEL and The Bank of N.T. Butterfield & Son
                             Limited
          10.43           -- Chattel Mortgage between HEL and The Bank of N.T. Butterfield & Son Limited
          10.44           -- Form of Employment Agreement between Eagle Geophysical and David Burns.
          10.45           -- Operating Lease of Marine Seismic Equipment dated as of July 1, 1996, between Seismic
                             Geophysical, Inc. and HEL
</TABLE>
    
<PAGE>   12
 
   
<TABLE>
<CAPTION>
      EXHIBIT NO.                                DESCRIPTION
      -----------                                -----------
<C>                      <S>
          10.46           -- Assignment between HEL and The Bank of NT Butterfield & Sons Limited
          10.47           -- Letter of Hypothecation and Pledge dated August 30, 1994, between Seismic Exploration
                             Ltd. and The Bank of N.T. Butterfield & Son Limited
          10.48           -- Lease Agreement dated January 7, 1997, between DigiCOURSE INC. and HEL
          10.49           -- Lease Agreement dated March 27, 1997, between DigiCOURSE INC. and HEL
          10.50*          -- Initial Definitive Trust Deed -- Horizon Pension Plan
          10.51           -- Operating Lease dated February 3, 1997, between Eagle Geophysical, Inc. and HEL
          10.52           -- Contribution Agreement dated as of May 30, 1997, between Seitel, Inc. and Eagle
                             Geophysical, Inc.
          10.53           -- Assignment of Life Insurance dated December 9, 1993 insuring G.M. Harrison.
          10.54           -- Lease dated December 12, 1995, between Newington Bricks Limited and HEL
          10.55           -- Lease dated August 25, 1993, between Marley Waterproofing Limited and HEL
          10.56*          -- Form of Master Agreement for Geophysical Services by and between Eagle Geophysical
                             Onshore, Inc. and Seitel Data, Ltd.
          10.57*          -- Form of Master Agreement for Geophysical Services by and between Eagle Geophysical
                             Onshore, Inc. and DDD Energy, Inc.
          23.1**          -- Consent of Arthur Andersen LLP, Independent Public Accountants
          23.2**          -- Consent of KPMG, Independent Public Accountants
          23.3*           -- Consent of Gardere Wynne Sewell & Riggs, L.L.P. (contained in exhibit 5.1 opinion)
          27**            -- Financial data schedule
</TABLE>
    
 
- ---------------
 
 * To be filed by amendment
 
** Previously filed

<PAGE>   1
                                                                          10.1.1

                          LOAN AND SECURITY AGREEMENT
                                    between
                           SEITEL GEOPHYSICAL, INC.,
                                   as Debtor,
                                      and
               NATIONSBANC LEASING CORPORATION OF NORTH CAROLINA,
                               as Secured Party,
                            dated as of July 9, 1996


         THIS LOAN AND SECURITY AGREEMENT dated as of July 9, 1996 (as amended,
modified, supplemented, restated and/or replaced from time to time, the
"Agreement"),  between  SEITEL GEOPHYSICAL, INC., a Delaware corporation
("Debtor"), and NATIONSBANC LEASING CORPORATION OF NORTH CAROLINA, a North
Carolina corporation ("Secured Party").

PRELIMINARY STATEMENTS:

         (1)     Debtor has requested that Secured Party make loans in the
aggregate principal amount of $7,264,211.13 to Debtor pursuant to the terms of
the Agreement as evidenced by promissory notes in such amount to finance
Debtor's acquisition of the Equipment (hereinafter defined).

         (2)     Secured Party has agreed to make the Loans to Debtor on the
condition, among other things, that Debtor shall have executed and delivered
the Notes (hereinafter defined) payable to Secured Party, this Agreement, any
required amendment or supplement hereto Granting (hereinafter defined) Secured
Party a first priority security interest in the Collateral (hereinafter
defined), related UCC-1 financing statements and other filings reasonably
deemed necessary or prudent by Secured Party to perfect such security interest.

         NOW, THEREFORE, in consideration of the premises and for other good
and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, Debtor and  Secured Party hereby agree as follows:

                                   ARTICLE I

             DEFINED TERMS; CREDIT FACILITIES; CONDITIONS PRECEDENT

         SECTION 1.1      Definitions.  When used in this Agreement, the
following capitalized terms shall have the following meanings (such meanings to
be equally applicable to both the singular and plural forms of the terms
defined):





<PAGE>   2
         "Affiliate" means a Person (i) which directly or indirectly through
one or more intermediaries controls, or is controlled by, or is under common
control with,  Debtor; (ii) which beneficially owns or holds 10% or more of any
class of the voting stock of Debtor, or (iii) of which 10% or more of the
voting stock is beneficially owned or held by Debtor or a Subsidiary.

         "Assigned Agreements" has the meaning set forth in Section 2.1 (b)
hereof.

         "Beneficiary" has the meaning set forth in Section 6.1 hereof.

         "Bills of Sale" means each warranty bill of sale in favor of the
Debtor duly executed by the Seller of the Equipment.

         "Break-Funding Costs" means, in the case of any voluntary prepayment
of all or any portion of the unamortized balance of the Loans, an amount
reasonably determined by Secured Party as shall compensate Secured Party as a
result of the inability of Secured Party in its reasonable discretion to
redeploy the amount so prepaid at an interest rate equal to or greater than the
interest rate on the applicable Loan and for a term equal to the remaining
average life of the applicable Loan.

         "Business Day" means any day other than a day on which banking
institutions in the states of North Carolina or Georgia are authorized or
required by law to close.

         "Closing Date" means July 12, 1996.

         "Collateral" shall have the meaning set forth in Section 2.1 hereof.

         "Default" shall mean an event or occurrence which upon the giving of
notice and/or the lapse of time shall constitute an Event of Default.

         "Equipment" means each item of marine-based or land-based seismic
recordation equipment as more specifically described in Exhibit A attached
hereto and made a part hereof.

         "Equipment Cost" means, with respect to any item of Equipment, an
amount equal to the sum of (a) the total cost paid by Debtor for such item of
Equipment plus (b) all excise, sales and use taxes and registration fees paid
by Debtor on or with respect to the acquisition of such item of Equipment, both
as evidenced by invoices, appraisals and/or bills of sale in form and substance
reasonably satisfactory to Secured Party.

         "ERISA" has the meaning set forth in Section 3.1(t) hereof.

         "Event of Default" has the meaning set forth in Section 5.1 hereof.

         "Event of Loss" with respect to an item of Equipment means any of the
following events:  (i) loss of any item of Equipment or of the use thereof due
to theft or disappearance prior to the





                                       2

<PAGE>   3
expiration or termination of this Agreement, or the non-existence of any item
of Equipment at the expiration or termination of this Agreement, (ii)
destruction, damage beyond repair, or rendition of any item of Equipment
permanently unfit for normal use for any reason whatsoever, (iii) any damage to
any item of Equipment which results in an insurance settlement with respect to
such item of Equipment on the basis of a total loss, or (iv) the condemnation,
confiscation, seizure, or requisition of use or title to any item of Equipment
by any governmental authority under the power of eminent domain or otherwise.

         "Event of Loss Payment Date" has the meaning set forth in Section 4.3
hereof.

         "Grant" means to grant, bargain, sell, warrant, remise, release,
convey, assign, transfer, mortgage, pledge, deposit, set over, confirm or
create a security interest under the North Carolina UCC.  A grant with respect
to any instrument, document or agreement shall include all rights, powers and
options (but none of the obligations) of the granting party thereunder,
including without limitation the right to generally do anything which the
granting party then is or thereafter may be entitled to do thereunder or with
respect thereto.

         "Guarantor" means Seitel, Inc., a Delaware corporation.

         "Guaranty" means the Guaranty Agreement dated as of the date hereof,
as such may be amended, modified, supplemented, restated and/or replaced from
time to time, executed by Guarantor for the benefit of Secured Party.

         "Installment Payment Date" means the last day of each monthly period
with respect to Term Loan A and Term Loan B.

         "Lien" means any lien, claim, charge, security interest, mortgage
and/or other encumbrance.

         "Loans" means each of Term Loan A and Term Loan B.

         "North Carolina UCC" or "UCC" means the North Carolina Uniform
Commercial Code, N.C. Gen. Stat. Chapter 25, Articles 1-11, as now in effect
and as hereafter amended from time to time.

         "Notes" means each of Secured Term Note A and Secured Term Note B.

         "Notice of Borrowing" means a notice of borrowing delivered pursuant
to Section 1.3(b)(i) substantially in the form of Schedule 1.3(b)(i) hereto.

         "PBGC" has the meaning set forth in Section 3.1(t) hereof.

         "Permitted Contest" means any contest by Debtor with respect to any
Lien, tax or imposition referred to in Section 6.2 hereof, so long as Debtor
shall contest, in good faith and





                                       3

<PAGE>   4
at its expense, the existence, the amount or the validity thereof, the amount
of the damages caused thereby, or the extent of its liability therefor, by
appropriate Proceedings which do not result in (i) the collection of, or other
realization upon, the tax, assessment, levy, fee, rent or Lien so contested,
(ii) the sale, forfeiture or loss of any item of Equipment or any material part
thereof, or (iii) any interference with the use of any item of Equipment or any
material part thereof.

         "Permitted  Encumbrances",  with respect to the Collateral, means (i)
this Agreement and any assignment permitted hereby, (ii) any Lien affecting the
Collateral for work or service performed or materials furnished securing
amounts which are not yet due and payable or which are not otherwise delinquent
and (iii) any Lien which is the subject of a Permitted Contest and (iv) any
other Lien incurred in the ordinary course of business which such Lien does not
exceed $50,000.

         "Permitted Lease" shall mean a lease of all the Equipment or any
portion thereof entered into between Debtor and a Permitted Lessee; provided,
that the following conditions shall  be met with respect to each such lease:
(i) Secured Party shall have given its prior written consent to such lease;
(ii) upon the effective date of such lease, there shall exist no Default or
Event of Default and no Liens on any of the Collateral other than the Permitted
Encumbrances; (iii) each such lease shall specify explicitly as a condition to
the effectiveness of such lease that (A) Debtor shall remain fully obligated
and in compliance with the terms and conditions of this Agreement and (B) upon
Secured Party's delivery to the lessee of notice specifying that an Event of
Default has occurred and is continuing and that the Secured Party has commenced
the exercise of remedies with respect to the Equipment, such lease will
automatically terminate and be of no further force or effect and the lessee
will cause each item of Equipment then subject to such lease to be delivered to
Secured Party at a place to be designated by Secured Party.  For purposes of
this definition, the subleases entered between Debtor, as lessor, and Seller,
as lessee, with respect to the Equipment shall be considered a "Permitted
Lease."

         "Permitted Lessee" shall mean any Person which (i) is domiciled in the
United States, (ii) in Debtor's reasonable opinion, is financially responsible
and (iii) at the time Debtor enters into such lease, is not the subject of any
filing by or against such Person of a petition under any federal bankruptcy law
or any federal law replacing or superseding such law or any state bankruptcy
law in which such Person is named as debtor.  For purposes of this definition,
Seller  shall be considered a "Permitted Lessee."

         "Person" means an individual or a corporation, partnership, trust,
association, joint venture,  joint stock company, firm or other enterprise or
government (or a political subdivision or any agency, department or
instrumentality thereof) or other entity of any kind.

         "Plan" means any "employee benefit pension plan" or other  "plan"
(including a "multi-employer plan" as defined in Section 3(37) of ERISA)
established or maintained, as to which contributions have been made, by Debtor
or any Affiliate for either of their respective employees





                                       4

<PAGE>   5
and which is covered by Title IV of ERISA or to which Section 412 of the
Internal Revenue Code of 1986, as amended applies.

         "Proceeding" means any suit in equity, action at law or other judicial
or administrative proceeding.

         "Replacement Equipment" means an item (i) of comparable make, model
and manufacture as the item of Equipment with respect to which an Event of Loss
has occurred, (ii) selected by Debtor and consented to by Secured Party, such
consent not to be unreasonably withheld or delayed, (iii) owned by Debtor free
and clear of all Liens and other encumbrances other than Permitted Encumbrances
and (iv) having a value, utility and useful life at least equal to, and being
in as good operating condition as, the item of Equipment with respect to which
the Event of Loss occurred, assuming such item of Equipment was in the
condition and repair required by the terms hereof immediately prior to the
occurrence of the Event of Loss.

         "Secured Obligations" has the meaning set forth in Section 2.2 hereof.

         "Secured Party" means NationsBanc Leasing Corporation of North
Carolina, a North Carolina corporation, and its successors and assigns.

         "Security Instrument" means each of this Agreement, and any other
instrument, document, financing statement or agreement with respect to which
any right or interest in or with respect to the Collateral has been Granted to
Secured Party or has been recorded with the appropriate filing office.

         "Secured Term Note A" means the promissory note of the Debtor in favor
of the Secured Party dated the Closing Date evidencing Term Loan A as provided
pursuant to Section 1.3 (a) (iii), as amended, modified, supplemented,
extended, renewed or replaced from time to time.

         "Secured Term Note B", means the promissory note of the Debtor in
favor of the Secured Party dated the Closing Date evidencing Term Loan B as
provided pursuant to Section 1. 3 (b) (iii), as amended, modified,
supplemented, extended, renewed or replaced from time to time.

         "Seller" means Horizon Exploration Ltd., a company organized and
existing under the laws of England.

         "Subsidiary" means any corporation, limited liability company,
partnership, joint venture, trust or estate of which (i) more than 50% of the
outstanding capital stock having ordinary voting power to elect a majority of
the board of directors of such corporation; or (ii) the interest in the capital
or profits of such corporation, limited liability company, partnership or joint
venture; or (iii) the beneficial interest of such trust or estate is owned
directly or indirectly by Guarantor and/or one of its Subsidiaries.

         "Taxes or Other Impositions" has the meaning set forth in Section 6.2
hereof.





                                       5

<PAGE>   6
         "Term Loan A" means the term loan made pursuant to the provisions of 
Section 1.3(a).

         "Term Loan A Commitment" has the meaning set forth in Section 1.3(a)
hereof.

         "Term Loan B" means the term loan made pursuant to the provisions of 
Section 1.3(b).

         "Term Loan B Commitment" has the meaning set forth in Section 1.3(b)
hereof.

         "Term Loan B Draw Termination Date" has the meaning set forth in
Section 1.3 (b) hereof.

         "Termination Value" means, with respect to any or all item(s) of
Equipment, an amount equal to the Equipment Cost of such item(s) of Equipment
multiplied by the Termination Value Percentage as of such Installment Payment
Date.

         "Termination Value Percentage" means the termination value percentage
as of each Installment Payment Date as s forth in Exhibit B hereto.

         SECTION 1.2      Other Terms.  Unless otherwise defined in this
Agreement, all terms defined in the North Carolina UCC and used in this
Agreement have the meanings set forth in the North Carolina UCC.

         SECTION 1.3      Term Loans.

                 (a)      Term Loan A.  Subject to and upon the terms and
         conditions and relying upon the representations and warranties herein
         set forth, the Secured Party agrees to   make a term loan ("Term Loan
         A") to the Debtor on the Closing Date in the principal amount of FIVE
         MILLION NINE HUNDRED TWO THOUSAND THREE HUNDRED AND SEVENTY-TWO
         DOLLARS ($5,902,372) (the "Term Loan A Commitment") for the purposes
         hereinafter set forth.  Amounts repaid on Term Loan A may not be
         reborrowed.  The Secured Party will make Term Loan A available to the
         Debtor by deposit in U.S. dollars of immediately available funds to
         the Debtor's account at the offices of Compass Bank in Houston, Texas.

                          (i)     Payment of Principal and Interest.  Principal
                 and interest on Term Loan A shall be payable in sixty (60)
                 consecutive monthly installments on the last day of each
                 monthly period, beginning with the first of such dates to
                 occur after the Closing Date.  Each installment shall be in
                 payments of principal and interest equal to 2.027639% of the
                 Term Loan A Commitment.  Payments received on Term Loan A
                 shall be applied first to accrued interest and then to
                 principal in inverse order of maturity.  In the event the 
                 actual rate of interest exceeds the  assumed rate, additional 
                 payments of interest will be made in the amount of the excess 
                 thereof, payable on demand.





                                       6

<PAGE>   7
                          (ii)  Interest.  Term Loan A shall bear interest at a
                 per annum rate equal to eight percent (8%); provided, however,
                 that upon the occurrence and during the continuation of an
                 Event of Default hereunder, the principal of and, to the
                 extent permitted by law, interest on Term Loan A hereunder
                 shall bear interest, payable on demand, at a rate equal to
                 2.0% per annum in excess of the rate otherwise  applicable
                 hereunder.

                          (iii)   Secured Term Note  A.  Term Loan A shall be
                 evidenced by a duly executed promissory note of the Debtor to
                 the Secured Party dated the Closing  Date in an original
                 principal amount equal to the Term Loan A Commitment and
                 substantially in the form of Schedule 1.3(a) hereto.

                 (b)      Term Loan B.  Subject to and upon the terms and
         conditions and relying upon the representations and warranties herein
         set forth, the Secured Party agrees to make two (2) advances ("Term
         Loan B") to the Debtor from time to time from the Closing Date until
         August 31, 1996 (as such date may be extended from time to time in the
         sole discretion of the Secured Party, (the "Term Loan B Draw
         Termination Date")) in an aggregate principal amount of up to ONE
         MILLION THREE HUNDRED SIXTY-ONE THOUSAND EIGHT HUNDRED AND THIRTY-NINE
         AND 13/100 DOLLARS ($1,361,839.13) (the" Term Loan B  Commitment") for
         the purposes hereinafter set forth.  Amounts repaid on Term Loan B may
         not be reborrowed.

                          (i)     Term Loan B Advances.  So long as the
                 conditions to advances have been satisfied, the Secured Party
                 will make Term Loan B advances to the Debtor from time to time
                 from the Closing Date to the Term Loan B Draw Termination Date
                 upon submission of a Notice of Borrowing substantially in the
                 form of Schedule 1.3(b)(i) to the Secured Party on the
                 Business Day prior to the date of the requested advance.  Each
                 such notice shall specify (A) the date of the requested
                 advance (which shall be a Business Day), (B) shall not exceed,
                 taking into account all prior Term Loan B advances, the Term
                 Loan B Commitment and  (C) shall be accompanied by any
                 supporting invoices and requisitions relating to the requested
                 advance.  The Secured Party shall make such Term Loan B
                 advances available by deposit to the Debtor's account at the
                 office of Compass Bank in Houston, Texas.

                          (ii)    Payment of Principal and Interest.  Term Loan
                 B shall be subject to a draw period during which accrued
                 interest shall be payable monthly in arrears  on the last day
                 of each monthly period beginning with the first of such dates
                 to occur after the Closing Date.  Interest during such draw
                 period shall accrue at the daily equivalent rate of eight and
                 six hundredths percent (8.06%) per annum for the actual number
                 of days elapsed with respect to Term Loan B advances made on
                 the Closing Date and throughout the draw period.  Beginning on
                 the last day of the first monthly period after the Term Loan B
                 Draw Termination Date, Debtor shall make payments of principal
                 and interest on Term Loan B in thirty-six (36)





                                       7

<PAGE>   8
                 consecutive monthly installments on the last day of each
                 monthly period.  Each installment shall be in payments of
                 principal and interest equal to 3.136405% of the Term Loan B
                 Commitment.  Payments received on Term Loan B shall be applied
                 first to accrued interest and then to principal in inverse
                 order of maturity.  In the event the actual rate of interest
                 exceeds the assumed rate, additional payments of interest will
                 be made in the amount of the excess thereof, payable on
                 demand.

                          (iii)   Interest.  Term Loan B shall bear interest at
                 a per annum rate equal to eight and six hundredths percent
                 (8.06%); provided, however, that upon the occurrence and
                 during the continuation of an Event of Default hereunder, the
                 principal of and, to the extent permitted by law, interest on
                 Term Loan B hereunder shall bear interest, payable on demand,
                 at a rate equal to 2.0% per annum in excess of the rate
                 otherwise applicable hereunder.

                          (iv)    Secured Term Note B.  Term Loan B shall be
                 evidenced by a duly executed promissory note of the Debtor to
                 the Secured Party dated the Closing Date in an original
                 principal amount equal to the Term Loan B Commitment and
                 substantially in the form of Schedule 1.3(b) hereto.

                 (c)      Early Termination.  (i)  On any Installment Payment
                 Date on or after the  second anniversary of the Closing Date,
                 Debtor may, upon sixty (60) days' prior written notice to
                 Secured Party, terminate the Loans and this Agreement.  Debtor
                 shall pay to Secured Party on the applicable Installment
                 Payment Date the sum of:  (A) the Termination Value as of such
                 Installment Payment Date, plus (B) any Break- Funding Costs,
                 plus (C) any accrued but unpaid interest with respect to
                 either Loan to the extent the Installment Payment Date for
                 Term Loan A and Term Loan B are not the same date each month,
                 plus (D) all other obligations owing under the Agreement on
                 the termination date.  Upon receipt of the amounts set forth
                 in (A)-(D) above, Secured Party shall release its Lien on the
                 Collateral.

                          (ii)    On any Installment Payment Date on or after
                 the second anniversary of the Closing Date, Debtor may, upon
                 sixty (60) days' prior written notice to Secured Party, prepay
                 a portion of the Loans in accordance with the terms hereof.
                 Debtor shall have the option to make up to three (3)
                 prepayments in the aggregate on the Loans, each prepayment in
                 an amount not less than $200,000.  Debtor shall pay to Secured
                 Party on the applicable Installment Payment Date the sum of:
                 (A) the prepayment amount, plus (B) any Break-Funding Costs,
                 plus (C) any accrued but unpaid interest with respect to the
                 prepayment.  Amounts so prepaid under this subsection (c)(ii)
                 shall be applied to outstanding obligations owing under this
                 Agreement in the reasonable discretion of the Secured Party.

         SECTION 1.4      Conditions Precedent.  The obligation of Secured
Party to make any Loan advance shall be subject to the following conditions, as
appropriate:





                                       8

<PAGE>   9
                 (a)      Conditions to All Advances on Closing Date.  Each
         Loan advance on the Closing Date shall be subject to the delivery to
         Secured Party of the following originally executed documents (unless
         otherwise noted) each in form and substance satisfactory to Secured
         Party and the satisfaction of the other conditions set forth herein:

                          (i)     the Agreement;

                          (ii)    the Notes;

                          (iii)   the Guaranty;

                          (iv)    evidence of payment (or evidence of 
                 exemption) of any and all sales, transfer, use, documentation
                 or similar taxes due in connection with the acquisition of the
                 Equipment by Debtor;

                          (v)     a secretarial certificate from Debtor: (A)
                 certifying Debtor's articles of incorporation, by-laws and
                 resolutions, with such resolutions authorizing the overall
                 transaction and Debtor's execution, delivery and performance
                 of this Agreement and (B) containing an incumbency
                 certification of Debtor with the name(s), title(s) and
                 specimen signature(s) of the person or persons authorized on
                 behalf of Debtor to execute this Agreement.

                          (vi)    an officer's certificate from Debtor:  (A)
                 stating that no material adverse change has occurred in the
                 condition of Debtor (financial or otherwise) since the date of
                 the last financial statement of Guarantor which has been
                 delivered to Secured Party which would impair the ability of
                 Debtor to pay and perform its obligations under this Agreement
                 and (B) stating that no Default or Event of Default shall have
                 occurred and be continuing as of such date;

                          (vii)   a secretarial certificate from Guarantor:
                 (A) certifying Guarantor's articles of incorporation, by-laws
                 and resolutions, with such resolutions authorizing the overall
                 transaction and Guarantor's execution, delivery and
                 performance of the Guaranty and (B) containing an incumbency
                 certification of Guarantor with the name(s), title(s) and
                 specimen signature(s) of the person or persons authorized on
                 behalf of Guarantor to execute the Guaranty;

                          (viii)  an officer's certificate from Guarantor:  (A)
                 stating that no material adverse change has occurred in the
                 condition of Guarantor (financial or otherwise) since the date
                 of the last financial statement of Guarantor which has been
                 delivered to Secured Party which would impair the ability of
                 Guarantor to pay and perform its obligations under the
                 Guaranty and (B) stating that no Default or Event of Default
                 shall have occurred and be continuing as of such date;

                          (ix)    a written opinion of counsel for Debtor and
                 Guarantor;





                                       9

<PAGE>   10
                          (x)     copies of the Bills of Sale;

                          (xi)    certificates of insurance evidencing the
                 coverages required hereunder;

                          (xii)   Uniform Commercial Code filings as deemed
                 appropriate by Secured Party's counsel duly executed by Debtor
                 and necessary third parties;

                          (xiii)  good standing certificates from the Secretary
                 of State of Debtor's state of incorporation and the state of
                 Debtor's chief executive office; and

                          (xiv)   good standing certificates from the Secretary
                 of State of Guarantor's state of incorporation and Guarantor's
                 chief executive office.

                          (xv)    UCC, tax and judgment lien searches as deemed
                 necessary or advisable by Secured Party;

                          (xvi)   the absence on the date hereof of any Liens
                 on the Collateral, other than any Permitted Encumbrance in
                 favor of Secured Party; and

                          (xvii)  Secured Party shall have received such other
                 documents, certificates,  financing statements and other
                 items, in form and substance satisfactory to Secured Party, as
                 Secured Party may request.

                 (b)      Term  Loan B Advances.  The obligation of the Secured
         Party to make Term Loan B advances after the Closing Date is subject
         to satisfaction of the following conditions:

                          (i)     delivery to the Secured Party of a Notice of
                 Borrowing;

                          (ii)    no material adverse change in the condition
                 of the Debtor (financial or otherwise) shall have occurred
                 since the Closing Date;

                          (iii)   the absence on the date of such advance of
                 any Default or Event of Default; and

                          (iv)    no Lien or other interest shall have been
                 permitted to attach to the Collateral superior or subordinate
                 to the interest of the Secured Party under this Agreement,
                 except for Permitted Encumbrances.





                                       10

<PAGE>   11
                                   ARTICLE II

                               SECURITY INTEREST

         SECTION 2.1      Grant of Security Interest.  Debtor hereby Grants to
Secured Party a first priority security interest in the following
(collectively, the items described in subsections (a)-(d) may be referred to
herein as the "Collateral"):

                 (a)      All right,  title and interest of the Debtor in and
         to the Equipment as the same is now and will hereafter be constituted,
         whether now owned by the Debtor or hereafter acquired, together with
         all accessories, equipment, parts and appurtenances appertaining or
         attached to the Equipment whether now owned or hereafter acquired, and
         all substitutions, renewals and replacements of and additions,
         improvements, accessions and accumulations to the Equipment together
         with all the rents, issues, income, profits and avails thereof.

                 (b)      All right, title, interest, claims and demands of
         Debtor in, to and under the following (collectively the "Assigned
         Agreements"):

                          (i)     the Bills of Sale;

                          (ii)    the Permitted Leases; and

                          (iii)   any and all other contracts and agreements
                 (excluding this Agreement and any supplement or modification
                 thereto and the Notes) relating to the Equipment or any rights
                 or interests therein to which Debtor is now or may hereafter
                 be a party, together with all rights, powers, privileges,
                 licenses, easements, options and other benefits of Debtor
                 under each thereof, including without limitation the right to
                 make all waivers and agreements, to give and receive all
                 notices and other instruments or communications, to take such
                 action  upon the occurrence of a default thereunder, including
                 the commencement, conduct and consummation of legal,
                 administrative or other Proceedings, as shall be permitted
                 thereby or by law, and to do any and all other things which
                 Debtor  is or may be entitled to do thereunder.

                 (c)      The proceeds from a sale or transfer of any right,
         title or interest of Debtor in the Equipment or any portion thereof.

                 (d)      All proceeds of any and all of the foregoing
         Collateral, whether now owned or hereafter acquired by Debtor and
         wherever located, including without limitation:

                          (i)     cash, accounts receivable, instruments,
                 contract rights, chattel paper, documents of title and any
                 other obligation due to Debtor with respect to or in
                 connection with the foregoing Collateral; and





                                       11

<PAGE>   12
                          (ii)    to the extent not otherwise included, all
                 payments under any  casualty insurance (whether or not Secured
                 Party is the loss payee thereof),  condemnation award,
                 indemnity, warranty or guaranty, payable by reason of loss or
                 damage to or otherwise with respect to any of the foregoing
                 Collateral.

                 The Collateral shall mean and include all personal property
         and the proceeds of such personal property described in any and all
         amendments to this Agreement hereafter executed by Debtor and Secured
         Party in connection with the Loan.

         SECTION 2.2      Security for Secured Obligations.   This Agreement
secures the payment of all indebtedness and other obligations of Debtor to
Secured Party with respect to:  the Loans, whether now or hereafter existing,
including without limitation Debtor's obligations to Secured Party under the
Notes or any other instrument and all amendments thereto and renewals and
extensions thereof, whether for principal, interest, fees, expenses or
otherwise; all of Debtor's  obligations of payment and performance now or
hereafter existing under this Agreement, including, without limitation, all
amendments hereto and renewals and extensions hereof (all such obligations of
Debtor described in this Section 2.2 being, collectively, the "Secured
Obligations").

         SECTION 2.3      Security Interest Absolute.  All rights of Secured
Party and security  interests hereunder and all Secured Obligations shall be
absolute and unconditional, irrespective of:

                 (i)      any lack of validity or enforceability of the Notes,
         this Agreement or any other Security Instrument or any other agreement
         or instrument relating thereto;

                 (ii)     any change in the time, manner, or place or payment
         of, or in any other term of, all or any of the Secured Obligations or
         any other amendment or waiver of or any consent to any departure from
         the Notes, this Agreement or any other Security  Instrument; or

                 (iii)    any exchange, release or non-perfection of any other
         collateral, or any release, amendment or waiver of or consent to
         departure from any guaranty, for all or any of the Secured
         Obligations.

                                  ARTICLE III

                   REPRESENTATIONS, WARRANTIES AND COVENANTS

         SECTION 3.1      Debtor's  Representations  and   Warranties.  Debtor
hereby represents and  warrants to Secured Party that:

                          (a)     Debtor is a corporation duly organized and
         validly existing under the laws of the State of its incorporation and
         has all requisite corporate power, authority and legal right to own
         its properties, including without limitation the Collateral, to





                                       12

<PAGE>   13
         conduct its business as is now being conducted and to execute, deliver
         and perform its obligations under the Notes, this Agreement, each
         other Security Instrument to which it is a party and each other
         document or agreement related to the Collateral to which it is a
         party.  Debtor is fully qualified to do business and is in good
         standing in each jurisdiction in which the failure to be in good
         standing would have a material adverse effect on the business or
         operations of Debtor.

                 (b)      The execution, delivery and performance by Debtor of
         the Notes, this Agreement and each other Security Instrument to which
         it is a party are within Debtor's corporate powers, have been duly
         authorized by all requisite corporate action, do not contravene
         Debtor's charter or by-laws or any law, governmental rule or
         regulation, or any order, writ, injunction, decree, determination or
         award currently in effect applicable to, or any contractual
         restriction binding on or affecting, Debtor or any of its properties,
         including without limitation the Collateral, and do not result in or
         require the creation of any Lien, security  interest, right of
         acceleration, charge or encumbrance (other than pursuant to this
         Agreement) upon or with respect to any of its properties.

                 (c)      No authorization or approval or other action by, and
         no notice to or filing (other than the filings referred to in
         subparagraph (f) below) with, any governmental authority or regulatory
         body, shareholders or any other Person is required for the due
         execution, delivery and performance by Debtor of this Agreement or any
         other Security Instrument to which it is a party.

                 (d)      The Notes, this Agreement and each other Security
         Instrument to which Debtor is a party are the legal, valid and binding
         obligations of Debtor, enforceable against Debtor in accordance with
         their respective terms, subject, in the case of enforceability, to
         applicable bankruptcy, insolvency, reorganization, moratorium and
         other laws of affecting creditors' rights generally and to the
         application of general principles of equity (regardless of whether
         such enforceability is considered in a proceeding in equity or at
         law).

                 (e)      The proceeds of the Loans will he used only to
         finance the purchase by Debtor of the Equipment; Debtor owns good and
         marketable title to the Equipment; the Collateral is free and clear of
         all Liens (except for Permitted Encumbrances in favor of Secured
         Party); and the Equipment is in good condition and ready for
         operation.  The Equipment is and will retain its character as personal
         property, and neither Debtor, Guarantor, or any Affiliate or
         Subsidiary of either Debtor or Guarantor shall affix or attach any
         item of Equipment in any manner so as to alter the character of the
         Equipment as personal property subject to the UCC.

                 (f)      The filing of Uniform Commercial Code financing
         statements in the office of the Secretary of State of the State of
         Texas will create a valid perfected first priority security interest
         in the Collateral, securing the payment of the Secured Obligations,
         and all filings and other actions necessary or desirable to perfect
         and protect such security





                                       13

<PAGE>   14
         interests will have been taken.  No Person other than Secured Party
         holds any security interest affecting the Collateral.  No effective
         Security Instrument or other instrument similar in effect covering all
         or any part of the Collateral is on file in any recording office,
         except such as may have been filed in favor of Secured Party relating
         to this Agreement.

                 (g)      Debtor's chief executive office is located in Harris
         County, Houston, Texas.  The Debtor has not used any trade names or
         other names, except for "Eagle Geophysical."

                 (h)      Contemporaneously with the execution and delivery of
         this Agreement, Debtor is delivering to Secured Party evidence of
         insurance satisfying the requirements of Section 4.1 hereof.

                 (i)      Debtor is not currently insolvent, as defined in 11
         U.S.C. 101(32) nor will it be rendered insolvent by virtue of entering
         into the Notes, this Agreement or any other Security Instrument to
         which it is a party or carrying out any of the transactions
         contemplated hereby or thereby.

                 (j)      Each financial statement of Guarantor which has been
         furnished to Secured Party fairly presents the financial condition of
         Guarantor as of the date of such financial statement.  There has been
         no material adverse change in Guarantor's financial condition since
         the date of the most current financial statement delivered to Secured
         Party.

                 (k)      There is no pending, or to the Debtor's knowledge,
         threatened, action or Proceeding affecting Debtor, Guarantor or any of
         their properties before any court, governmental agency or arbitrator
         which may materially and adversely affect the condition (financial or
         otherwise) or operations of Debtor, Guarantor or any of their
         properties or which purports to affect the validity or enforceability
         of the Notes, this Agreement or any other Security Instrument to which
         Debtor is a party.

                 (l)      No Default or Event of Default has occurred and is
         continuing.

                 (m)      All sales, transfer, use, documentation or similar
         taxes, fees or other charges due and payable prior to or as of the
         date hereof have been paid to the extent such are in connection with
         the sale to and purchase by Debtor of the Equipment.

                 (n)      Debtor is not a party to, nor bound by, any contract,
         agreement or instrument that would conflict with this Agreement, the
         Notes or any other contracts, agreements or instruments executed in
         connection with the transactions contemplated by this Agreement.

                 (o)      Debtor has agreed, and hereby acknowledges, to accept
         service of process at its address set forth in Section 8.1 hereof in
         person or by registered or certified mail





                                       14

<PAGE>   15
         return receipt requested, postage prepaid, in connection with any
         Proceeding initiated by Secured Party in any of the courts referenced
         in Section 8.11 hereof.

                 (p)      The Debtor has no Subsidiaries, except for African
         Geophysical, Inc., a corporation organized and existing under the laws
         of the Cayman Islands.

                 (q)      Debtor has not incurred any accumulated unfunded
         deficiency within the meaning of the Employee Retirement Income
         Security Act of 1974, as amended from time to time ("ERISA") nor has
         Debtor incurred any material liability to the Pension Benefit Guaranty
         Corporation ("PBGC") established under such Act (or any successor
         thereto under such Act) in connection with any Plan.  Debtor and its
         Affiliates are in compliance in all material respects with those
         provisions of ERISA and the regulations and public interpretations
         thereunder which are applicable to Debtor and its Affiliates, except
         for such noncompliance as would not have a material adverse effect on
         the financial condition of Debtor and its Affiliates, taken as a
         whole.

                 (r)      Debtor has filed all income tax returns required to
         be filed prior to the date hereof with the various governmental
         entities having taxing authority with respect to Debtor.

                 (s)      Debtor (i) is not an "investment company" as such
         term is defined in, or otherwise subject to regulations under, the
         Investment Company Act of 1940 and (ii) is not a "holding company" as
         that term is defined in, and is not otherwise subject to regulations
         under, the Public Utility Holding Company Act of 1935.

                 (t)      Debtor has not sold, extended any offer to sell nor
         accepted any offer to purchase regarding any of Debtor's interest in
         the Collateral or with respect to the transactions described in the
         Security Instruments or the Notes.

                 (u)      Debtor has delivered true and accurate copies of the
         Bills of Sale executed by Seller with respect to the transfer of the
         Equipment to Debtor.

         SECTION 3.2      Affirmative Covenants.  Until all the Secured
Obligations shall have been fully paid and satisfied, Debtor covenants and
agrees that it shall, unless Secured Party shall have otherwise consented in
writing:

                 (a)      promptly pay the principal of, interest on, and any
         other amounts due under the Notes as and when the same become due,
         whether at maturity, by acceleration or otherwise;

                 (b)      (i)  duly, punctually and faithfully perform its
         obligations under the Notes, this Agreement and each other Security
         Instrument to which it is a party; (ii) maintain the Liens and
         security interests created by this Agreement and each other Security
         Instrument to which it is a party as valid and perfected Liens on and
         security interests in all of the





                                       15

<PAGE>   16
         Collateral, prior in right to any other Lien, security interest, claim
         or other encumbrance; (iii) warrant and defend its interest in and to
         the Collateral against the claims and demands of all Persons; and (iv)
         defend, at Debtor's cost, any action, claim or Proceeding affecting
         the Collateral;

                 (c)      use the proceeds of the Loans only to finance the
         purchase by Debtor of the Equipment and maintain good and marketable
         title to the Equipment, free and clear of any Liens, security
         interests, charges or encumbrances except for the security interest
         created by this Agreement and Permitted Encumbrances;

                 (d)      notify Secured Party at least thirty (30) days prior
         to the changing of the chief executive office of the Debtor from the
         location specified in Section 3.1(g);

                 (e)      at no expense to Secured Party, cause each item of
         Equipment to be serviced, maintained and preserved in the same
         condition, repair and working order as when new, ordinary wear and
         tear excepted, and in accordance with any manufacturer's suggested or
         approved maintenance program and warranty requirements, and shall, in
         the case of any loss or damage to any item of Equipment, promptly
         furnish to Secured Party a statement respecting any such loss or
         damage and (unless an Event of Loss shall have occurred with respect
         to an item of Equipment) as quickly as practicable after the
         occurrence thereof make or cause to be made all repairs, replacements
         and other improvements in connection therewith which are necessary or
         desirable to keep each item of Equipment in proper working order;

                 (f)      permit Secured Party to inspect the Equipment during
         normal business hours upon reasonable prior notice to Debtor;

                 (g)      from time to time execute and deliver all such
         supplements and amendments hereto and to any other Security
         Instrument, and all such financing statements, continuation
         statements, instruments of further assurance and other instruments,
         and take such other action, as the Secured Party requests and
         reasonably deems necessary or advisable to:  (i) further Grant,
         maintain or preserve the Lien and security interest contemplated by
         this Agreement or carry out more effectively the purposes hereof; (ii)
         perfect or protect the validity of any Security Instrument or of any
         Grant made or to be made by this Agreement; or (iii) enforce any
         Security Instrument or preserve and defend title to the Collateral and
         the rights of the Secured Party therein against the claims of all
         Persons and parties;

                 (h)      comply with all of its representations, warranties
         and covenants set forth in this Agreement, in the Notes and each
         Security Instrument to which it is a party; and punctually perform and
         observe all of its obligations and agreements contained in this
         Agreement, in the Notes and each Security Instrument to which it is a
         party;





                                       16

<PAGE>   17
                 (i)      promptly notify the Secured Party of any default by
         any Person under any Security Instrument;

                 (j)      remain a duly organized and validly existing
         corporation under the laws of the state of its incorporation and
         remain duly qualified to do business and in good standing in each
         jurisdiction in which the failure to be in good standing would have a
         material adverse effect on the business or operations of Debtor;

                 (k)      comply in all material respects with all applicable
         laws, rules, regulations and orders; and preserve and maintain all
         federal, state and local licenses, privileges, franchises,
         certificates and other permits necessary for the operation of its
         business and the operation of each item of Equipment;

                 (l)      pay or cause to be paid promptly when due (i)
         (subject to the right of Debtor, in accordance with the provisions of
         this Agreement to obtain extensions of the date on which such taxes
         are due) all property and other taxes (including without limitation
         income, sales, use, franchise and gross receipts taxes) and
         governmental charges or levies which are at any time or from time to
         time levied upon or assessed against it or any item of Equipment or
         are otherwise associated with the ownership, use or operation of any
         item of Equipment (except such taxes levied on the net income of
         Secured Party) and (ii) all claims (including without limitation
         claims for labor, materials and supplies) against any item of
         Equipment; provided, that Debtor may contest any such tax or claim by
         appropriate Proceedings so long as such Proceedings shall suspend the
         collection thereof, no part of the Collateral would be subject to
         sale, forfeiture or diminution during the pendency of such
         Proceedings, Debtor shall have furnished such security as may be
         required in the Proceedings or reasonably requested by Secured Party,
         Debtor conducts such contests in good faith and with due diligence,
         and promptly after the final determination of each such contest,
         Debtor pays all amounts which shall be determined to be payable in
         respect thereof;

                 (m)      within 120 days after the end of each fiscal year
         furnish to the Secured Party unaudited year end financial reports of
         the Debtor including without limitation (i) a balance sheet and (ii)
         statements of income and retained earnings, all prepared in accordance
         with generally accepted accounting principles consistently applied and
         certified by the president, chief financial officer or any vice
         president of Debtor who prepared such financial statements as being
         true and accurate and fairly representing the financial condition of
         Debtor;

                 (n)      promptly report to Secured Party the commencement of
         any Proceeding against Debtor if such litigation reasonably would be
         expected to, in the event of an unfavorable outcome, cause an Event of
         Default, have a material adverse effect on Debtor's financial
         condition or operations, affect the validity or enforceability of the
         Notes, this Agreement or any of the Security Instruments or affect
         priority or enforceability of Secured Party's security interest in any
         of the Collateral;





                                       17

<PAGE>   18
                 (o)      promptly notify Secured Party in writing if a Default
         or an Event of Default has occurred;

                 (p)      upon the replacement of an item of Equipment with
         Replacement Equipment, Debtor, at its own expense, will promptly (i)
         cause a supplement hereto, in form and substance satisfactory to
         Secured Party, subjecting such Replacement Equipment to this
         Agreement, to be duly executed by Debtor, (ii) furnish Secured Party
         with such evidence of Debtor's title to such Replacement Equipment, of
         the condition of such Replacement Equipment, and of compliance with
         the insurance provisions hereof with respect to such Replacement
         Equipment and (iii) take such other action as Secured Party may
         request in order that such Replacement Equipment be duly and properly
         titled in Debtor and subject to this Agreement to the same extent as
         the item of Equipment replaced thereby;

                 (q)      (i) at all times, make prompt payment of all
         contributions required under its Plans and required to meet the
         minimum funding standard set forth in ERISA with respect to its Plans;
         (ii) notify Secured Party immediately of any fact, including, but not
         limited to, any Reportable Event (as defined in ERISA) arising in
         connection with any of its Plans, which might constitute grounds for
         termination thereof by the PBGC or for the appointment by the
         appropriate United States District Court of a trustee to administer
         such Plan, together with a statement, if requested by the Secured
         Party, as to the reason therefor and the action, if any, proposed to
         be taken with respect therefor; and (iii) furnish to Secured Party
         upon its request, such additional information concerning any of its
         Plans as may be reasonably requested;

                 (r)      Debtor shall pay, and save Secured Party harmless
         against, any and all losses, judgments, decrees and costs (including,
         without limitation, all reasonable attorneys' fees and expenses) in
         connection with any Permitted Contest and shall promptly after the
         final settlement, compromise or determination (including any appeals)
         of such contest, fully pay and discharge the amounts which shall be
         levied, assessed, charged or imposed or be determined to be payable
         therein or in connection therewith, together with all penalties,
         fines, interest, costs and expenses thereof or in connection
         therewith, and perform all acts, the performance of which shall be
         ordered or decreed as a result thereof.

       SECTION 3.3       Negative Covenants.  Until the Secured Obligations
shall have been fully paid and satisfied, Debtor shall not, without the prior
written consent of Secured Party:

                 (a)     (i) sell, lease, assign, transfer, convey, Grant an
       interest in, exchange or otherwise dispose of any of the Collateral or
       any part thereof or (ii) cause or permit any subleasing of any of the
       Equipment (except that Debtor may lease any or all items of Equipment to
       a Permitted Lessee pursuant to a Permitted Lease);

                 (b)     create or suffer to exist any Lien affecting the
       Collateral or any part thereof, other than in favor of Secured Party or
       other Permitted Encumbrances;





                                       18

<PAGE>   19
                 (c)     use the Equipment for any unlawful purpose;

                 (d)     dissolve, wind up or liquidate or seek or permit the
       dissolution or liquidation of Debtor in whole or in part;

                 (e)     [intentionally omitted];

                 (f)     as against Secured Party, claim any credit on, or make
       any deduction from, the principal or interest payable on the Notes,
       whether by reason of the payment of any taxes levied or assessed upon
       any of the Collateral, or otherwise;

                 (g)     take or permit any action which would result in an
       Event of Default;

                 (h)     [intentionally omitted];

                 (i)     [intentionally omitted];

                 (j)     enter into any new line of business or operation not
       currently in existence with respect to the Debtor or materially alter
       its existing operations;

                 (k)     consolidate with or merge into any other corporation
       or sell, assign, convey, transfer or lease substantially all of its
       assets as an entirety to any Person unless:

                         (i)      Debtor is the surviving entity of any such
                 consolidation or merger; or

                         (ii)     (A) the corporation formed by such
                 consolidation or into which Debtor is merged, or the Person
                 which acquires by conveyance, transfer or lease of
                 substantially all of the assets of Debtor as an entirety,
                 shall be a solvent corporation organized and existing under
                 the laws of the United States or any state thereof or the
                 District of Columbia and shall execute and deliver to Secured
                 Party an agreement containing an effective assumption by such
                 successor, transferee or lessee corporation of the due and
                 punctual performance and observance of each covenant and
                 condition of this Agreement;

                                  (B)      immediately prior to and after
                         giving effect to such transaction, no Default or Event
                         of Default shall have occurred and be continuing;

                                  (C)      Debtor shall have delivered to
                         Secured Party a certificate signed by an officer of
                         Debtor and an opinion of Debtor's counsel satisfactory
                         in form and substance to Secured Party stating that
                         such consolidation, merger, conveyance, transfer or
                         lease and the assumption agreement mentioned in clause
                         3.3(k)(ii)(A) above comply with the





                                       19

<PAGE>   20
                         requirements of this Section 3.3(k) and that all
                         conditions precedent herein provided for relating to
                         such transaction have been complied with.

       Upon any consolidation or merger in which Debtor is not the surviving
corporation, or any conveyance, transfer or lease of substantially all the
assets of Debtor as an entirety in accordance with this Section 3.3(k), the
successor corporation formed by such consolidation or into which Debtor is
merged or to which such conveyance, transfer or lease is made (x) shall succeed
to, and be substituted for (but without release of Debtor from any of its
obligations hereunder) and (y) may exercise every right and power of, Debtor
under this Agreement with the same effect as if such successor corporation had
been named as a Debtor herein.

                 (1)     attach or affix any item of Equipment in any manner so
       as to alter the character of the Equipment as personal property subject
       to the UCC.

                                   ARTICLE IV

              INSURANCE, TRANSFER, CONDEMNATION AND EVENT OF LOSS

       SECTION 4.1       Insurance.

                 (a)     Property and Liability Insurance.  So long as this
       Agreement is in effect, Debtor shall maintain and keep in force, or
       cause to be maintained and kept in force, without cost or expense to
       Secured Party, with respect to all items of Equipment prior to the
       expiration or earlier termination of this Agreement (i) all-risk
       property damage insurance in an amount not less than the aggregate
       Termination Value for all items of Equipment of such type as shall be
       satisfactory to Secured Party and (ii) comprehensive general public
       liability insurance, including blanket contractual and personal injury
       insurance, covering any risks which Secured Party or Debtor might incur
       by reason of the use or operation of the Equipment in or over any area,
       in an amount not less than $6,000,000 per occurrence. Such insurance
       policy or policies referenced to in clause (i) of the preceding sentence
       will name Secured Party as a loss payee to the extent of its interest;
       provided, that upon verification by Secured Party that all amounts owing
       to Secured Party under the Agreement, the Notes or any other Security
       Instrument have been paid in full, then Secured Party shall remit all
       remaining property damage insurance proceeds, respecting any item of
       Equipment, to the extent such proceeds are controlled by Secured Party,
       to Debtor. Such insurance policy or policies referenced to in clause
       (ii) of the preceding sentence will name Secured Party as an additional
       insured.  Each of the policies required by this Section 4.1 will provide
       that (A) the same may not be invalidated against Secured Party by reason
       of (1) any violation of a condition or breach of warranty of the
       policies or the application therefor by any Person excepting Secured
       Party, (2) the use of any item of Equipment for purposes not permitted
       by such policies any Person excepting Secured Party, (3) any foreclosure
       proceeding or notice of sale regarding any item of Equipment or (4) the
       title or beneficial ownership of any item of Equipment being held by a
       party other than Debtor; (B) the policies may be canceled or materially
       amended by





                                       20

<PAGE>   21
       the insurer only after thirty (30) days' prior written notice to Secured
       Party; (C) the interests of Secured Party in such insurance policies are
       assignable and (D) such insurance policies shall be primary insurance.
       Each of the policies required by this Section 4.1 shall otherwise be
       reasonably satisfactory to Secured Party.  The policies of insurance
       required under this Section shall be valid and enforceable policies
       issued by insurers of recognized responsibility acceptable to Secured
       Party.  On or before the date hereof, and thereafter at intervals of not
       more than twelve months, Debtor will furnish or cause to be furnished to
       Secured Party a certificate or other evidence satisfactory to Secured
       Party signed by an independent insurance broker certifying to Secured
       Party's satisfaction that Debtor has insurance in place with respect to
       all items of Equipment which complies with the insurance requirements of
       this Agreement.  If Debtor shall fail to cause the insurance required
       under this Section 4.1 to be carried and maintained, Secured Party may,
       but shall have no obligation to, provide such insurance and Debtor shall
       reimburse Secured Party upon demand for the cost thereof as a
       supplemental payment hereunder in addition to other amounts owing with
       respect to the Notes or this Agreement.

       SECTION 4.2       Transfer of Collateral.  Except as otherwise expressly
provided by the provisions of this Loan and Security Agreement, Debtor will not
(prior to the satisfaction of all Obligations) lease, Grant or otherwise
transfer the Collateral or any part thereof or any interest therein to any
party other than Secured Party without Secured Party's prior written consent
and any and all such transfers shall be made under and subject to Secured
Party's security interest in such Collateral hereunder.  Prior to or
simultaneously with any such transfer, the transferee shall accept, agree to
and execute an agreement assuming Debtor's Obligations to Secured Party, in
form and substance satisfactory to Secured Party.

       SECTION 4.3       Condemnation.  Immediately upon obtaining knowledge
thereof, Debtor shall notify Secured Party of any condemnation or other eminent
domain Proceedings with respect to any item of Equipment.  Secured Party may
participate in any such Proceedings, and Debtor shall provide Secured Party
with all instruments required by it to permit such participation upon obtaining
actual knowledge thereof.  Debtor shall pay all reasonable fees and expenses
incurred by Secured Party in connection with Secured Party's participation in
any such Proceedings.  All proceeds arising from any such eminent domain
Proceedings shall be paid to and applied by the Secured Party as specified in
Section 5.3 hereof.

       SECTION 4.4       Certain Events of Loss.  Upon the occurrence of an
Event of Loss with respect to any item of Equipment, Debtor shall pay Secured
Party within thirty (30) days after receipt of insurance proceeds after the
occurrence of such Event of Loss (but in no event shall such period extend 120
days beyond the date of the occurrence of such Event of Loss) or, if such day
is not a Business Day, on the next occurring Business Day (the "Event of Loss
Payment Date") an amount equal to the sum of (a) the Termination Value
(computed as of the Installment Payment Date immediately preceding the Event of
Loss Payment Date) for the items of Equipment then subject to the Event of
Loss, plus (b) all accrued but unpaid interest, plus (c) any Break-Funding
Costs with respect to the items of Equipment then subject to the Event of Loss,
plus (d) all other obligations owing hereunder on the Event of Loss Payment
Date.  Upon





                                       21

<PAGE>   22
payment of the amounts set forth in (a)-(d) above, Secured Party shall release
its Lien on the items of Equipment then subject to the Event of Loss.

                                   ARTICLE V

                         EVENTS OF DEFAULT AND REMEDIES

       SECTION 5.1       Events of Default.  Any of the following occurrences
or acts shall constitute an event of default under this Agreement
(individually, an "Event of Default"):

                 (a)     Debtor shall fail to pay any principal of, or interest
       on, the Notes or any other indebtedness of Debtor to Secured Party, now
       or hereafter existing, within five (5) Business Days from the date the
       same shall be due and payable, whether at maturity, by acceleration or
       otherwise; or

                 (b)     Except as specified in Section 5.1(a), Debtor shall
       default in the payment of any costs or expenses incurred by Secured
       Party in connection herewith or any other amounts hereunder or under the
       Notes within ten (10) Business Days from the date on which Secured Party
       notifies Debtor of such default; or

                 (c)     Debtor shall fail to observe the terms and covenants
       of Sections 3.2(b)(ii), 3.2(c), 3.2(l), 3.3(a)-(1) or 4.1; or

                 (d)     Except as otherwise specified in Sections 5.1(a)-(c),
       Debtor shall fail to perform or observe any other term, covenant or
       agreement contained in the Notes, this Agreement or any other Security
       Instrument and such failure shall remain unremedied for a period of
       thirty (30) days from either the date Debtor first knows of such failure
       or the date on which Secured Party notifies Debtor of such failure; or

                 (e)     Any representation or warranty made by Debtor in the
       Notes, this Agreement, any other Security Instrument or in any
       certificate or other document delivered pursuant hereto or thereto shall
       prove to have been incorrect or misleading in any material respect when
       made; or

                 (f)     Debtor shall admit in writing its inability to pay its
       debts, or shall make a general assignment for the benefit of creditors;
       or any Proceeding shall be instituted by or against Debtor seeking to
       adjudicate it bankrupt or insolvent, or seeking reorganization,
       liquidation, arrangement, adjustment or composition of it or its debt
       under any law relating to bankruptcy, insolvency or reorganization or
       relief of debtors, or seeking appointment of a receiver, custodian,
       trustee, or other similar official for it or for any substantial part of
       its property, and, in the case of any such Proceeding instituted against
       Debtor, it shall remain undismissed for a period of sixty (60) days; or
       Debtor shall take any action to authorize any of the actions set forth
       in this subsection (f); or





                                       22

<PAGE>   23
                 (g)     This Agreement shall, for any reason, except to the
       extent permitted by the terms hereof, cease to create a valid first
       priority Lien on and perfected first priority security interest in any
       of the Collateral purported to be covered hereby; or

                 (h)     Any provision of the Notes, this Agreement or the
       other Security Instruments shall cease to be valid and binding on
       Debtor, as a signatory thereto, or Debtor shall so state in writing; or
       Secured Party shall be deprived of any of the benefits of the Note, this
       Agreement or any other Security Instrument for any reason whatsoever; or

                 (i)     For any reason whatsoever, Debtor is not entitled to
       or does not possess the property rights or other rights regarding the
       Collateral which have been assigned or transferred to Secured Party; or

                 (j)     Debtor shall dissolve or any action shall be taken by
       Debtor to wind up or liquidate Debtor's business, affairs or property or
       assets or Debtor shall announce its intention to do so without Secured
       Party's prior written consent; or

                 (k)     Any sale, transfer, conveyance, abandonment,
       condemnation, partition or change in ownership of any item or items of
       Equipment in excess of $50,000, or any portion thereof shall occur,
       whether in one transaction or a series of transactions without Secured
       Party's prior written consent; or

                 (l)     An attachment or other Lien shall be filed or levied
       against a substantial part of the property of Debtor (or any Affiliate
       of Debtor) and such judgment shall continue unstayed and in effect, or
       such attachment or Lien shall continue undischarged or unbonded, for a
       period of sixty (60) days; or

                 (m)     Guarantor shall fail to make a payment under the
       Guaranty within five (5) Business Days from the date such payment is
       due; or

                 (n)     Except as specified in Section 5.1(m), Guarantor shall
       fail to perform or observe any other term, covenant or agreement
       contained in the Guaranty and such failure shall remain unremedied for a
       period of thirty (30) days from either the date Guarantor first knows of
       such failure or the date on which Secured Party notifies Guarantor of
       such failure; or

                 (o)     Any representation or warranty made by Guarantor in
       the Guaranty or in any certificate or other document delivered pursuant
       thereto shall prove to have been incorrect or misleading in any material
       respect when made; or

                 (p)     Guarantor shall admit in writing its inability to pay
       its debts, or shall make a general assignment for the benefit of
       creditors; or any Proceeding shall be instituted by or against Guarantor
       seeking to adjudicate it bankrupt or insolvent, or seeking
       reorganization, liquidation, arrangement, adjustment or composition of
       its finances or debt





                                       23

<PAGE>   24
       under any law relating to bankruptcy, insolvency or reorganization or
       relief of debtors, or seeking appointment of a receiver, custodian,
       trustee, or other similar official for its finances or for any
       substantial part of its property, and, in the case of any such
       Proceeding instituted against Guarantor, it shall remain undismissed for
       a period of sixty (60) days; or Guarantor shall take any action to
       authorize any of the actions set forth in this subsection (p); or

                 (q)     Guarantor (or any Affiliate of Guarantor) shall be in
       default (i) under any lease, loan agreement or other agreement,
       instrument or document respecting any such obligation of Guarantor (or
       any Affiliate of Guarantor) in excess of $10,000,000, now or hereafter
       entered into between Guarantor (or any Affiliate of Guarantor) and
       Secured Party, or between Guarantor (or any Affiliate of Guarantor) and
       any parent, subsidiary or affiliate of Secured Party, and such default
       shall have been declared by the party entitled to declare the same, (ii)
       under any promissory note, now or hereafter executed by Guarantor (or
       any Affiliate of Guarantor) and delivered to any party referred to in
       clause (i) above evidencing a loan made by any such party to Guarantor
       (or any Affiliate of Guarantor) or (iii) in the payment of any single
       amount due by Guarantor (or any Affiliate of Guarantor) to any Person
       (other than Secured Party, or any parent, subsidiary or affiliate of
       Secured Party) in excess of $10,000,000 (excluding any such obligation
       which is being contested in good faith by Guarantor (or any Affiliate of
       Guarantor) by appropriate proceedings, and the liability for which has
       not been reduced to judgment) relating to the payment of borrowed money
       or the payment of rent or hire under any lease agreement and such
       default shall have continued for more than thirty (30) days after the
       date Guarantor (or any Affiliate of Guarantor) obtained knowledge or
       received notice thereof; or an attachment or other Lien shall be filed
       or levied against a substantial part of the property of Guarantor or
       Debtor and such judgment shall continue unstayed and in effect, or such
       attachment or Lien shall continue undischarged or unbonded, for a period
       of sixty (60) days; or

                 (r)     Any provision of the Guaranty shall cease to be valid
       and binding on Guarantor, as a signatory thereto, or Guarantor shall so
       state in writing; or Secured Party shall be deprived of any of the
       benefits of the Guaranty for any reason whatsoever; or

                 (s)     Any action shall be taken by Guarantor to wind up or
       liquidate Guarantor's business, affairs or property or assets or
       Guarantor shall announce his intention to do so without Secured Party's
       prior written consent.

       SECTION 5.2       Remedies.  If any Event of Default shall have occurred
and be continuing:

                 (a)     the Secured Party may do one or more of the following:

                         (i)      declare the Notes and all interest thereon
                 and all other Secured Obligations to be forthwith due and
                 payable, whereupon the Notes, all such interest and all
                 Secured Obligations shall become and be forthwith due and





                                       24

<PAGE>   25
                 payable, without presentation, demand, protest or further
                 notice of any kind, all of which are hereby expressly waived
                 by Debtor;

                         (ii)     exercise, in respect of the Collateral, in
                 addition to other rights and remedies provided for herein or
                 otherwise available to it, all the rights and remedies of a
                 secured party on default under the UCC and/or other applicable
                 law and also (A) require Debtor to, and Debtor hereby agrees
                 that it will at its expense and upon the request of Secured
                 Party forthwith, assemble all or part of the Collateral as
                 directed by Secured Party and make it available to Secured
                 Party at a place to be designated by Secured Party and (B)
                 without notice except as specified below, sell the Collateral
                 or any part thereof in one or more parcels at public or
                 private sale, at any of Secured Party's offices or elsewhere,
                 for cash, on credit or for future delivery, and upon such
                 other terms as Secured Party may deem commercially reasonable.
                 Debtor agrees that, to the extent notice of sale shall be
                 required by law, at least fifteen (15) days' notice to Debtor
                 of the time and place of any public sale or the time after
                 which any private sale is to be made shall constitute
                 reasonable notification.  Secured Party shall not be obligated
                 to make any sale of Collateral regardless of notice of sale
                 having been given.  Secured Party may adjourn any public or
                 private sale from time to time by announcement at the time and
                 place fixed therefor, and such sale may, without further
                 notice, be made at the time and place to which it was so
                 adjourned;

                         (iii)    to the extent permitted by applicable law,
                 bring suit at law, in equity or through other appropriate
                 Proceedings, whether for the specific performance of any
                 covenant or agreement contained in this Agreement or any of
                 the other Security Instruments, for an injunction against a
                 violation of any of the terms hereof or thereof, in aid of the
                 exercise of any power Granted hereby or thereby, or by law, to
                 recover judgment for any and all amounts due on the Notes,
                 this Agreement, any of the other Security Instruments or
                 otherwise, including, without limitation, any deficiency
                 remaining after foreclosure hereunder;

                         (iv)     exclude Debtor from the Collateral and take
                 immediate possession of interest therein, and, at the expense
                 of Debtor, maintain, repair, alter, use, add to, improve,
                 insure, lease, operate and manage the Collateral in such
                 manner as Secured Party shall see fit; and

                         (v)      take any other appropriate action to protect
                 and enforce the rights and remedies of Secured Party
                 hereunder, or under or in respect of any other Security
                 Instrument, or otherwise.

                 (b)     Notwithstanding any provision to the contrary
       contained in this Agreement, the Notes or any other Security Instrument,
       the unpaid principal amount of the Notes and all accrued interest and
       other sums payable under the Notes or under this Agreement shall be
       forthwith payable upon a sale of any portion of the Collateral pursuant
       to subsection





                                       25

<PAGE>   26
       (a)(ii) of this Section 5.2.  All earnings, revenues, proceeds, rents,
       issues, profits and income derived pursuant to subsection (a)(iv) of
       this Section 5.2 (after deducting costs and expenses of operation and
       other proper charges), all proceeds of any such sale and all other money
       and property received or recovered by the Secured Party pursuant to this
       Section 5.2 shall be held and applied as set forth in Section 5.3
       hereof.

                 (c)     The power to effect any sale under this Section 5.2
       shall not be exhausted by any one or more sales as to any portion of the
       Collateral remaining unsold, but shall continue unimpaired until all of
       the Collateral shall have been sold or all of the Secured obligations
       shall have been paid in full.

                 (d)     Secured Party may bid for and acquire any portion of
       the Collateral in connection with a sale thereof under this Section 5.2,
       and may pay all or part of the purchase price by crediting against
       amounts owing on the Secured Obligations, all or part of the net
       proceeds of such sale after deducting the costs, charges and expenses
       incurred by Secured Party in connection with such sale.  The Notes need
       not be produced in order to complete any such sale or effect such
       credit.  Secured Party may hold, lease, operate, manage or otherwise
       deal with any property so acquired in any manner permitted by law.

                 (e)     Secured Party shall execute and deliver an appropriate
       instrument of conveyance transferring its interest in any portion of the
       Collateral in connection with a sale thereof under this Section 5.2.  In
       addition, Debtor hereby irrevocably appoints Secured Party as its agent
       and attorney-in-fact to transfer and convey its interest in any portion
       of the Collateral in connection with such a sale thereof and to take all
       action necessary to effect such sale.  No purchaser or transferee at
       such a sale shall be bound to ascertain Secured Party's authority,
       inquire into the satisfaction of any condition precedent or see to the
       application of any monies.

                 (f)     Secured Party's right to seek and recover judgment on
       the Secured Obligations shall not be affected by the seeking, obtaining
       or application of any other relief under or with respect to this
       Agreement.  Neither the Lien of this Agreement nor any rights or
       remedies of Secured Party shall be impaired by the recovery of any
       judgment by Secured Party against Debtor or by the levy of an execution
       under such judgment upon any portion of the Collateral.

                 (g)     All rights and remedies from time to time conferred
       upon or reserved to the Secured Party are cumulative, and none is
       intended to be exclusive of another and shall be in addition to every
       other right or remedy permitted by law.  No delay or omission in
       insisting upon the strict observance or performance of any provision of
       this Agreement, or in exercising any right or remedy, shall be construed
       as a waiver or relinquishment of such provision, nor shall it impair
       such right or remedy.  Every right and remedy may be exercised from time
       to time and as often as deemed expedient in any combination and order
       desired by Secured Party; provided, however, that Secured Party shall
       exercise none





                                       26

<PAGE>   27
       of the remedies referenced in this Section 5.2 with respect to the
       Collateral unless and until an Event of Default shall have occurred and
       be continuing.

                 (h)     Anything contained in this Agreement to the contrary
       notwithstanding, until an Event of Default shall occur and be
       continuing:  (i) all rights, powers, privileges and other benefits of or
       accruing to Debtor under the Assigned Agreements shall be exercisable
       only by Debtor, without the consent or approval of the Secured Party,
       (ii) Debtor shall retain full right to make all waivers and agreements,
       to give and receive all notices and other instruments or communications,
       and to take all action upon the occurrence of a default under any
       Assigned Agreement, including the commencement, conduct and consummation
       of legal, administrative or other proceedings, as shall be permitted
       thereby or by law, and to do any and all other things which Debtor is or
       may be entitled to do under any Assigned Agreement.

       SECTION 5.3       Proceeds of Collateral.  All cash proceeds received by
Secured Party in respect of any sale of, collection from, or other realization
upon all or any part of the Collateral shall be held by Secured Party as
collateral for, and then promptly thereafter applied by Secured Party against,
all or any part of the amounts due under the Notes and the other Secured
Obligations in such order as Secured Party shall elect.  Any surplus of such
cash or cash proceeds held by Secured Party and remaining after payment in full
of all the Secured Obligations shall be paid over to Debtor or to whomsoever
may be lawfully entitled to receive such surplus.

       SECTION 5.4       Waiver of Rights; Receiver.

                 (a)     Debtor consents to the appointment of one or more
       receivers of all or part of the Collateral, upon the request of Secured
       Party, if an Event of Default shall have occurred and be continuing.

                 (b)     To the extent permitted by law, Debtor hereby waives
       its right to seek, and hereby agrees that it will not seek or derive any
       benefit or advantage from, any of the following whether now existing or
       hereafter in effect:

                         (i)      any stay, extension, moratorium or similar
                 law with respect to the Collateral or the Secured Obligations;

                         (ii)     any law allowing for the redemption of any
                 portion of the Collateral after a sale thereof under Section
                 5.2 hereof; and

                         (iii)    any right to have any portion of the
                 Collateral after an Event of Default shall have occurred.

       Debtor covenants not to hinder, delay or impede the exercise of any
       right or remedy of Secured Party under or in respect of this Agreement
       and agrees to suffer and permit the exercise of each such remedy.





                                       27

<PAGE>   28
                                   ARTICLE VI

                             INDEMNITY AND EXPENSES

       SECTION 6.1       General Indemnity.  Debtor hereby assumes liability
for, and does hereby agree, whether or not any of the transactions contemplated
hereby, by the Security Instruments or the Notes are consummated, to indemnify,
protect, save, defend and hold harmless Secured Party and each of its officers,
directors, stockholders, successors, assigns, agents and servants (for purposes
of this Article VI, each of the foregoing may be referred to individually as a
"Beneficiary") from and against any and all obligations, fees, liabilities,
losses, damages, penalties, claims, demands, actions, suits, judgments, costs
and expenses, including, without limitation, reasonable legal fees and
expenses, of every kind and nature whatsoever imposed on, incurred by, or
asserted against any Beneficiary, in any way relating to or arising out of (a)
the manufacture, construction, ordering, purchase, acceptance or rejection,
financing, ownership, titling or retitling, registration or re-registration,
acceptance, leasing, subleasing, possession, use, operation, maintenance,
storage, removal, sale, delivery or other disposition of any item of Equipment,
including, without limitation, any of such as may arise from (i) loss or damage
to any property or death or injury to any person, (ii) patent or latent defects
in any item of Equipment (whether or not discoverable by Debtor or any
Beneficiary), (iii) any claims based on strict liability in tort or otherwise,
(iv) any claims based on patent, trademark or copyright infringement and (v)
any claims based on liability arising under the applicable environmental or
noise or pollution control law or regulation or (b) any failure on the part of
Debtor to perform or comply with any of the terms of the Security Instruments
or the Notes or (c) any Security Instrument or the Notes.  Debtor shall not be
required to indemnify any Beneficiary for any claims resulting from acts which
would constitute the willful misconduct or gross negligence of such
Beneficiary.  Debtor shall give Secured Party prompt notice of any occurrence,
event or condition known to Debtor as a consequence of which any Beneficiary is
or is reasonably likely to be entitled to indemnification hereunder.  Debtor
shall promptly upon demand of any such Beneficiary reimburse such Beneficiary
for amounts expended by it in connection with any of the foregoing or pay such
amounts directly.  Debtor shall be subrogated to a Beneficiary's rights in any
matter with respect to which Debtor has actually reimbursed such Beneficiary
for amounts expended by it or has actually paid such amounts directly pursuant
to this Section 6.1.  In case any action, suit or Proceeding is brought against
any Beneficiary in connection with any claim indemnified against hereunder,
such Beneficiary will, after receipt of notice of the commencement of such
action, suit or Proceeding, notify Debtor thereof, enclosing a copy of all
papers served upon such Beneficiary.  Debtor may, and upon any Beneficiary's
request will, at Debtor's expense, resist and defend such action, suit or
Proceeding, or cause the same to be resisted or defended by counsel selected by
Debtor and reasonably satisfactory to such Beneficiary and in the event of any
failure by Debtor to do so, Debtor shall pay all costs, fees and expenses
(including, without limitation, reasonable attorney's fees and expenses)
incurred by such Beneficiary in connection with such action, suit or
Proceeding.

       SECTION 6.2       General Tax Indemnity.  Debtor agrees to pay, and
indemnify and hold each Beneficiary harmless on an after-tax basis from, any
and all federal, state, local and foreign taxes,





                                       28

<PAGE>   29
fees, withholdings, levies, imposts, duties, assessments and charges of any
kind and nature whatsoever, together with any penalties, fines or interest
therein (herein called "Taxes or Other Impositions") howsoever imposed, whether
levied or imposed upon or asserted against such Beneficiary, Debtor, any item
of Equipment or any part thereof, by any federal, state or local government or
taxing authority in the United States, or by any taxing authority or
governmental subdivision of a foreign country, upon or with respect to (a) any
item of Equipment (b) the manufacture, construction, ordering, purchase,
ownership, financing, delivery, leasing, re-leasing, possession, use,
maintenance, registration, titling, licensing, documentation, return, sale
(including, without limitation, sale to a third party) or other application or
disposition thereof, (c) the payments, receipts or earnings arising from any
item of Equipment or (d) the Bills of Sale, the Security Instruments or the
Notes, or upon the payments by Debtor under the Bills of Sale, the Notes or the
Security Instruments; provided, however, that the foregoing indemnity shall not
apply to any taxes or other impositions to the extent based upon or measured by
any Beneficiary's net income (unless such tax or other imposition is a Covered
Income Tax as hereinafter defined), and which are imposed or levied by any
federal, state or local taxing authority in the United States.  For purposes
hereof, a "Covered Income Tax" shall mean an income tax (including, without
limitation, a tax imposed upon gross income or receipts) imposed on any
Beneficiary by any taxing authority (excluding the United States federal
government) in whose jurisdiction such Beneficiary (including for this purpose
all entities with which it is combined, integrated or consolidated in such
taxing authority's jurisdiction) would not engage in business, would not
maintain an office or other place of business and would not otherwise be
located therein, but for such Beneficiary's role in the transaction associated
with the financing of the Equipment, the operation of the Equipment in such
jurisdiction, the presence of Debtor or any use of the Equipment or the
transactions contemplated by the Bills of Sale, the Security Instruments or the
Notes.

       Each Beneficiary shall furnish Debtor with copies of any requests for
information received by such Beneficiary from any taxing authority relating to
any taxes or other impositions with respect to which Debtor is required to
indemnify hereunder, and if a claim is made against such Beneficiary for any
such taxes or other impositions, with respect to which Debtor is liable for a
payment or indemnity hereunder, such Beneficiary shall give Debtor notice in
writing within (10) Business Days of such Beneficiary's receipt of such claim.
Debtor may, at its sole cost and expense, either in its own name or in the name
of any Beneficiary, contest the validity, applicability or amount of any such
tax or other imposition by means of a Permitted Contest.  If any Beneficiary
shall obtain a refund of any amount paid by Debtor pursuant to this Section
6.2, such Beneficiary shall pay to Debtor the amount of such refund, together
with the amount of any interest actually received by such beneficiary on
account of such refund.  Debtor will promptly notify Secured Party of all
reports or returns required to be made with respect to any tax or other
imposition with respect to which Debtor is required to indemnify hereunder and
will promptly provide each Beneficiary with all information necessary for the
making and timely filing of such reports or returns by such Beneficiary.  If
any Beneficiary requests that any such reports or returns be prepared and filed
by Debtor, Debtor will prepare and file the same if permitted by applicable law
to do so, and if not so permitted, Debtor shall prepare such reports or returns
for signature by such Beneficiary, and shall forward the same, together with





                                       29

<PAGE>   30
immediately available funds for payment of any tax or other imposition due, to
such Beneficiary, at least ten (10) Business Days in advance of the date such
payment is to be made.  Upon written request, Debtor shall furnish each
Beneficiary with copies of all paid receipts or other appropriate evidence of
payment for all taxes or other impositions paid by Debtor pursuant to this
Section 6.2.

                                  ARTICLE VII

                FURTHER ASSURANCES; ATTORNEY-IN-FACT; DISCHARGE

       SECTION 7.1       Further Assurances.

                 (a)     Debtor agrees that from time to time, at the expense
       of Debtor, Debtor will promptly execute and deliver all further
       instruments and documents, and take all further action that Secured
       Party may reasonably deem necessary or desirable, or that Secured Party
       may otherwise reasonably request, in order to perfect and protect any
       security interest Granted or purported to be Granted hereby or to enable
       Secured Party to exercise and enforce its rights and remedies hereunder
       with respect to any Collateral.  Without limiting the generality of the
       foregoing, Debtor will cooperate to execute and file financing or
       continuation statements, or amendments hereto or thereto, and such other
       instruments or notices, as may be necessary or reasonably desirable, or
       as Secured Party may reasonably request, in order to perfect and
       preserve the security interests Granted or purported to be Granted
       hereby.

                 (b)     A carbon, photographic or other reproduction of this
       Agreement or any financing statement covering the Collateral or any part
       thereof shall be sufficient as a financing statement where permitted by
       law.

                 (c)     Debtor will furnish to Secured Party from time to time
       statements and schedules further identifying and describing the
       Collateral and such other reports in connection with the Collateral as
       Secured Party may reasonably request, all in reasonable detail.

       SECTION 7.2       Secured Party Appointed Attorney-in-Fact.  Debtor
hereby irrevocably appoints Secured Party to serve as Debtor's attorney-in-fact
(provided, the parties hereto agree that Secured Party may not act as Debtor's
attorney-in-fact until the occurrence and during the continuation of an Event
of Default), with full authority in the place and stead of Debtor and in the
name of Debtor, Secured Party or otherwise, from time to time in Secured
Party's discretion, to take any action and to execute any instrument, including
without limitation financing statements or amendments thereto, which Secured
Party may deem necessary or advisable to accomplish the purposes of this
Agreement, including without limitation:

                 (a)     to obtain and adjust insurance required to be paid to
       Secured Party hereunder;





                                       30

<PAGE>   31
                 (b)     to ask, demand, collect, sue for, recover, compound,
       receive and give acquittance and receipts for monies due and to become
       due under or in respect of any of the Collateral;

                 (c)     to receive, endorse, and collect any drafts or other
       instruments, documents and chattel paper, in connection with subsections
       (a) or (b) above; and

                 (d)     to file any claims or take any action or institute any
       Proceedings which Secured Party may deem necessary or desirable for the
       collection of any of the Collateral or otherwise to enforce the rights
       of Secured Party with respect to any of the Collateral.

       SECTION 7.3       Secured Party May Perform.  If Debtor fails to perform
any agreement contained herein, Secured Party may itself perform, or cause
performance of, such agreement, and the expenses of Secured Party incurred in
connection therewith shall be payable by Debtor under Section 6.1.

       SECTION 7.4       Secured Party's Duties.  The powers conferred on
Secured Party hereunder are solely to protect its interest in the Collateral
and shall not impose any duty upon it to exercise any such powers.  Secured
Party shall have no duty as to any Collateral or as to the taking of any
necessary steps to preserve rights against other parties or any other rights
pertaining to any Collateral.

       SECTION 7.5       Continuing Security Interest; Transfer of Note;
Termination.  This Agreement shall: (a) create a continuing security interest
in the Collateral and shall remain in full force and effect until payment in
full of the Secured Obligations, be binding upon Debtor, its successors and
assigns and (b) inure to the benefit of Secured Party and its permitted
successors, transferees and assigns.  Without limiting the generality of the
foregoing clause, Secured Party may assign or otherwise transfer all or any
part of Secured Party's interest in the Notes and/or the Security Instruments
to one or more persons or entities, and such other persons or entities shall
thereupon become vested with all the benefits in respect thereof Granted to
Secured Party herein.  Upon the payment in full of the Secured Obligations, the
security interest Granted hereby shall terminate and all rights to the
Collateral shall revert to Debtor.  Upon any such termination, Secured Party
will execute and deliver to Debtor such documents as Debtor shall reasonably
request to evidence such termination.

                                  ARTICLE VIII

                                 MISCELLANEOUS

       SECTION 8.1       Notices.  Except as expressly permitted herein to the
contrary, all notices and other communications provided for hereunder shall be
in writing (including communication by telecopier) and mailed (postage prepaid,
by registered or certified mail, return receipt requested), telecopied or hand
delivered:





                                       31

<PAGE>   32
if to Secured Party, at:

                         NationsBanc Leasing Corporation of
                            North Carolina
                         101 South Tryon Street, NC1-002-38-20
                         Charlotte, North Carolina  28255
                         Attention: Manager of Corporate Lease
                                      Administration
                         Telecopy: (704) 386-0892

or if to Debtor, at:

                         Seitel Geophysical, Inc.
                         50 Briar Hollow Lane, 7th Floor-West
                         Houston, Texas 77027
                         Attention: Debra D. Valice
                         Telecopy: (713) 627-1114

or, as to each party, at such other address as shall be designated by such
party in a written notice to the other party.  All such notices and
communications shall be effective (a) five (5) days after such have been
deposited in the mail or (b) immediately (i) after such have been telecopied to
the appropriate telecopy number and (ii) after such have been hand delivered to
the appropriate address.

       SECTION 8.2       Risk of Loss.  Debtor shall bear all risk of any loss
of or damage to the Collateral and in no event shall Secured Party be liable
for such loss or damage.

       SECTION 8.3       Powers and Agencies.  Whenever in this Agreement
Secured Party is Granted the power of attorney or is appointed the agent and
attorney-in-fact with respect to any Person, such Grant or appointment is
irrevocable and coupled with an interest.  Secured Party shall have full power
of substitution and delegation in respect of all such Grants and appointment.

       SECTION 8.4       Entire Agreement.  The Notes, this Agreement and the
other Security Instruments embody the entire agreement between the parties and
supersede all prior agreements and understandings, if any, relating to the
subject matter hereof.

       SECTION 8.5       Lawful Interest.  No provision in the Notes, this
Agreement or any Security Instrument or other document in favor of Secured
Party shall require or permit the collection of interest in excess of the
maximum lawful rate which Debtor may contract for, stipulate or agree to pay as
determined by a court of competent jurisdiction over the holder of the Notes or
any such document.  In determining whether or not the interest paid or payable
under any specific contingency exceeds such maximum lawful rate, Debtor and
Secured Party shall, to the full extent permitted by applicable law, prorate,
allocate and spread, in equal parts, the total amount of interest throughout
the entire contemplated term of the Notes or other document, as the case may





                                       32

<PAGE>   33
be, so that the interest rate is uniform throughout the entire term of the
Notes or such document.  If it is so determined that any interest in excess of
such maximum lawful rate is provided for, such excess shall be applied first to
any other amounts not constituting interest due or which may become due and
payable to Debtor under the Notes or any of such other documents, and the
balance, if any, shall be refunded to Debtor; provided, however, that in no
event shall Debtor be obligated to pay, and Secured Party hereby waives payment
of, the amount of interest to the extent it is in excess of the amount
permitted by applicable law.

       SECTION 8.6       Survival; Severability.  If any word, phrase,
sentence, paragraph, provision or section of this Agreement, the Notes or any
other Security Instrument shall be held, declared or pronounced void, voidable,
invalid, unenforceable or inoperative for any reason by any court of competent
jurisdiction, governmental authority or otherwise, such holding, declaration or
pronouncement shall not adversely affect any other word, phrase, sentence,
paragraph, provision or section of this Agreement, the Notes or any other
Security Instrument, which shall otherwise remain in full force and effect and
be enforced in accordance with their respective terms, and the effect of such
holding, declaration or pronouncement shall be limited to the territory or the
jurisdiction in which made.  All agreements, covenants, representations,
warranties and conditions contained in this Agreement or made pursuant to the
provisions hereof shall survive the execution and delivery of this Agreement
until the Secured Obligations shall have been paid and performed in full.  All
statements by Debtor contained in any certificate or other instrument delivered
pursuant to the provisions of this Agreement or any other Security Instrument
shall constitute the representations and warranties of Debtor.

       SECTION 8.7       Binding Effect.  This Agreement shall be binding upon
and inure to the benefit of Debtor and Secured Party and their respective
successors and assigns, except that Debtor shall not have the right to assign
its rights hereunder of any interest herein without the prior written consent
of Secured Party.  Secured Party may assign all or any part of, or any interest
in, its rights and benefits hereunder, under the Notes and any Security
Instrument as permitted under Section 7.5 hereof, and to the extent of such
permitted assignment each such assignee shall have the same rights and benefits
against Debtor as it would have had if it were Secured Party hereunder.

       SECTION 8.8       Amendment and Waiver.  No amendment or waiver of any
provision of the Notes, this Agreement or any of the other Security
Instruments, or consent to any departure by Debtor therefrom, shall in any
event be effective unless the same shall be in writing and signed by Secured
Party and Debtor, and such waiver and consent shall be effective only in the
specific instance and for the specific purpose for which given.  No failure on
the part of Secured Party to exercise, and no delay in exercising, any right
under the Notes, this Agreement or any of the other Security Instruments shall
operate as a waiver thereof; nor shall any single or partial exercise of any
right under any such instrument or agreement preclude any other or further
exercise thereof or the exercise of any other right.

       SECTION 8.9       Headings; Execution in Counterpart.  The section and
article headings herein are for convenience of reference only, and shall not
limit or otherwise affect the meaning





                                       33

<PAGE>   34
of any provision herein.  This Agreement may be executed in counterparts, each
of which shall constitute an original, but all of which together shall
constitute one and the same Agreement.

       SECTION 8.10        Transaction Costs.  Debtor shall pay all reasonable
costs and out-of-pocket expenses of Secured Party incurred in connection with
preparation, negotiation, execution, modification and/or enforcement of the
Notes, this Agreement, the other Security Instruments including without
limitation (a) the reasonable legal fees and expenses of Moore & Van Allen,
PLLC, (b) all filing and registration costs, (c) all fees and disbursements
incurred by Secured Party in connection with the custody, preservation, use or
operation of, or the sale of, collection from, or other realization upon, any
of the Collateral, and (d) all fees and disbursements incurred by Secured Party
in connection with the failure by Debtor to perform or observe any of the
provisions hereof.

       SECTION 8.11        APPLICABLE LAW; CONSENT TO JURISDICTION AND VENUE;
WAIVER OF JURY TRIAL.  THIS AGREEMENT,THE NOTES AND THE OTHER SECURITY
INSTRUMENTS AND ALL MATTERS RELATING THERETO SHALL, EXCEPT TO THE EXTENT
OTHERWISE REQUIRED BY APPLICABLE LAW, BE GOVERNED BY AND CONSTRUED AND
INTERPRETED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NORTH CAROLINA WITHOUT
REGARD TO CONFLICT OF LAWS PRINCIPLES.  DEBTOR HEREBY SUBMITS TO THE
JURISDICTION AND VENUE OF THE STATE AND FEDERAL COURTS OF MECKLENBURG COUNTY,
NORTH CAROLINA AND AGREES THAT SECURED PARTY MAY, AT ITS OPTION, ENFORCE ITS
RIGHTS HEREUNDER AND UNDER THE NOTES AND OTHER SECURITY INSTRUMENTS IN SUCH
COURTS.  DEBTOR HEREBY IRREVOCABLY WAIVES THE DEFENSE OF AN INCONVENIENT FORUM
TO MAINTENANCE OF ANY ACTION OR PROCEEDING BY SECURED PARTY IN SUCH COURTS.
DEBTOR HEREBY IRREVOCABLY WAIVES ALL RIGHT TO TRIAL BY JURY IN ANY ACTION,
PROCEEDING OR COUNTERCLAIM ARISING OUT OF OR RELATING TO THIS AGREEMENT, THE
NOTES OR ANY OTHER SECURITY INSTRUMENT OR ANY OF THE TRANSACTIONS CONTEMPLATED
HEREBY OR THEREBY.

       SECTION 8.12        Break-Funding Costs.  Upon any early termination of
this Agreement and/or any early prepayment of the Notes for any reason which is
not expressly permitted under the Notes, Debtor shall promptly pay Secured
Party (in addition to all other amounts due and owing hereunder) an amount
equal to the Break-Funding Costs incurred by Secured Party, as such are (a)
determined by Secured Party at such time in its reasonable discretion and (b)
specified in writing to Debtor.

       SECTION 8.13        Intention of the Parties.  It is the intention of
the parties to this Agreement that the Equipment be and remain personal
property, and at no time (so long as any of the Secured Obligations remain
outstanding) shall such Equipment be attached, affixed or otherwise become a
part of any vehicle or vessel.  Further, each of the parties hereto agree that
it is their intent that the provisions of the UCC govern the creation and
perfection of a security interest in the Collateral.





                                       34

<PAGE>   35
       IN WITNESS WHEREOF, Debtor and Secured Party have caused this Agreement
to be executed by their respective officers thereunto duly authorized as of the
date first above written.

                                          SEITEL GEOPHYSICAL, INC., as Debtor
                                          
                                          
                                          By: /s/ Horace A. Calvert
                                          Name: Horace A. Calvert
                                          Title: Executive Vice President
                                          
                                          
                                          
                                          NATIONSBANC LEASING CORPORATION OF
                                          NORTH CAROLINA, as Secured Party
                                          
                                          
                                          By: /s/ George L. Robinson, Jr.
                                          Name: George L. Robinson, Jr.
                                          Title: Senior Vice President





                                       35

<PAGE>   36
                                SCHEDULE 1.3(a)

                              SECURED TERM NOTE A
                               DUE JULY 12, 2001

$5,902,372.00                                                      July 12, 1996

       FOR VALUE RECEIVED, the undersigned SEITEL GEOPHYSICAL, INC., a Delaware
corporation ("Debtor") HEREBY PROMISES TO PAY to the order of NATIONSBANC
LEASING CORPORATION OF NORTH CAROLINA, a North Carolina corporation ("Secured
Party"), the principal sum of FIVE MILLION NINE HUNDRED TWO THOUSAND THREE
HUNDRED AND SEVENTY-TWO DOLLARS ($5,902,372.00) (the "Original Amount")
pursuant to the terms and conditions of that certain Loan and Security
Agreement dated as the date hereof between the Debtor and the Secured Party, as
amended, modified or replaced from time to time (as so amended, modified or
replaced, the "Agreement" - all the terms, conditions, definitions and
covenants of such Agreement are expressly made a part hereof in the same manner
and with the same effect as if set forth herein at length, any holder of this
Secured Term Note A (the "Note") being entitled to the benefits and remedies
provided for in the Agreement).

       The Bank has made a term loan to the Borrower as provided in Section
1.3(a) of the Loan Agreement.  The outstanding principal balance hereof shall
be due and payable as provided in Section 1.3(a)(i) of the Agreement.
Notwithstanding the foregoing, the final payment made on this Note shall be an
amount sufficient to discharge in full the unpaid Original Amount and all
accrued and unpaid interest on, and any other amounts due under this Note and
under the Agreement.

       This Note shall bear interest on the outstanding balance hereof, and
such interest shall be payable hereunder, as provided in Section 1.3(a)(i) and
(a)(ii) of the Agreement.

       In the event the amounts owing under this Note shall be accelerated in
accordance with the terms of the Agreement, the amounts owing hereunder shall
become immediately due and payable without presentation, demand, protest or
notice of any kind, all of which are hereby expressly waived.  Further, in the
event amounts owing hereunder are not paid when due (including any stated or
accelerated maturity), the Debtor agrees to pay promptly upon demand, in
addition to principal, interest and other amounts owing hereunder, all costs of
collection, including reasonable attorneys' fees.

       All payments shall be payable, in lawful money of the United States and
in immediately available funds without setoff or counterclaim, to Secured Party
at its office at NationsBank Plaza, 101 South Tryon Street, NC1-002-38-20,
Charlotte, North Carolina 28255 or such other address as the holder thereof
shall notify Debtor in writing.

       In determining whether or not the interest paid or payable, under any
specific contingency, exceeds the maximum lawful rate permitted by law, Debtor
and Secured Party shall, to the full





<PAGE>   37
extent permitted by applicable law, exclude voluntary prepayment and the
effects thereof and amortize, prorate, allocate and spread, in equal parts, the
total amount of interest throughout the entire contemplated term of this Note
so that the interest rate is uniform throughout the entire term of this Note.
If it is so determined that any interest in excess of such maximum lawful rate
is provided for, then such excess shall be applied first to any other amounts
not constituting interest due or which may become due under this Note or the
Agreement and the balance, if any, shall be refunded to Debtor; provided,
however, that in no event shall Debtor be obligated to pay, and Secured Party
hereby waives payment of, the amount of interest to the extent it is in excess
of the amount permitted by applicable law.   No provision in this Note or the
Agreement shall require or permit the collection of interest in excess of the
maximum lawful rate.

       This Note may be prepaid by the Debtor in accordance with Section 1.3(c)
of the Agreement only if all amounts owing with respect to this Note, Agreement
and the other Security Instruments are paid in full.  Except as otherwise
provided for herein and in the Agreement, this Note shall not be subject to
prepayment.

       THIS NOTE, THE AGREEMENT AND THE SECURITY INSTRUMENTS AND ALL MATTERS
RELATING THERETO SHALL, EXCEPT TO THE EXTENT OTHERWISE REQUIRED BY APPLICABLE
LAW, BE GOVERNED BY AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH THE LAWS
OF THE STATE OF NORTH CAROLINA WITHOUT REGARD TO CONFLICT OF LAWS PRINCIPLES.
DEBTOR HEREBY SUBMITS TO THE JURISDICTION AND VENUE OF THE STATE AND FEDERAL
COURTS OF NORTH CAROLINA AND AGREES THAT THE SECURED PARTY MAY, AT ITS OPTION,
ENFORCE ITS RIGHTS HEREUNDER AND UNDER THE AGREEMENT AND THE OTHER SECURITY
INSTRUMENTS IN SUCH COURTS.  DEBTOR HEREBY IRREVOCABLY WAIVES THE DEFENSE OF AN
INCONVENIENT FORUM TO MAINTENANCE OF ANY ACTION OR PROCEEDING BY SECURED PARTY
IN SUCH COURTS.  DEBTOR HEREBY IRREVOCABLY WAIVES ALL RIGHT TO TRIAL BY JURY IN
ANY ACTION, PROCEEDING OR COUNTERCLAIM ARISING OUT OF OR RELATING TO THIS NOTE,
THE AGREEMENT OR ANY OTHER SECURITY INSTRUMENT OR ANY OF THE TRANSACTIONS
CONTEMPLATED HEREBY OR THEREBY.

       IN WITNESS WHEREOF, the Debtor has caused this Note to be executed as of
the date appearing above.

                                            SEITEL GEOPHYSICAL, INC.
                                            
                                            
                                            By:                         
                                               --------------------------------
                                            
                                            Name (Printed):                    
                                                           --------------------
                                            
                                            Title:                             
                                                  -----------------------------





<PAGE>   38
                                SCHEDULE 1.3(b)

                              SECURED TERM NOTE B
                              DUE AUGUST 31, 1999

$1,361,839.13                                                      July 12, 1996

       FOR VALUE RECEIVED, the undersigned SEITEL GEOPHYSICAL, INC., a Delaware
corporation ("Debtor") HEREBY PROMISES TO PAY to the order of NATIONSBANC
LEASING CORPORATION OF NORTH CAROLINA, a North Carolina corporation ("Secured
Party"), the principal sum of ONE MILLION THREE HUNDRED SIXTY-ONE THOUSAND
EIGHT HUNDRED THIRTY-NINE AND 13/100 DOLLARS ($1,361,839.13) (the "Original
Amount") pursuant to the terms and conditions of that certain Loan and Security
Agreement dated as of the date hereof between the Debtor and the Secured Party,
as amended, modified or replaced from time to time (as so amended, modified or
replaced, the "Agreement" - all the terms, conditions, definitions and
covenants of such Agreement are expressly made a part hereof in the same manner
and with the same effect as if set forth herein at length, any holder of this
Secured Term Note B (the "Note") being entitled to the benefits and remedies
provided for in the Agreement).

       The Bank has made a term loan to the Borrower as provided in Section
1.3(b) of the Loan Agreement.  The outstanding principal balance hereof shall
be due and payable as provided in Section 1.3(b)(ii) of the Agreement.
Notwithstanding the foregoing, the final payment made on this Note shall be an
amount sufficient to discharge in full the unpaid Original Amount and all
accrued and unpaid interest on, and any other amounts due under this Note and
under the Agreement.

       This Note shall bear interest on the outstanding balance hereof, and
such interest shall be payable hereunder, as provided in Section 1.3(b)(ii) and
(b)(iii) of the Agreement.

       In the event the amounts owing under this Note shall be accelerated in
accordance with the terms of the Agreement, the amounts owing hereunder shall
become immediately due and payable without presentation, demand, protest or
notice of any kind, all of which are hereby expressly waived.  Further, in the
event amounts owing hereunder are not paid when due (including any stated or
accelerated maturity), the Debtor agrees to pay promptly upon demand, in
addition to principal, interest and other amounts owing hereunder, all costs of
collection, including reasonable attorneys' fees.

       All payments shall be payable, in lawful money of the United States and
in immediately available funds without setoff or counterclaim, to Secured Party
at its office at NationsBank Plaza, 101 South Tryon Street, NC1-002-38-20,
Charlotte, North Carolina 28255 or such other address as the holder thereof
shall notify Debtor in writing.





<PAGE>   39
       In determining whether or not the interest paid or payable, under any
specific contingency, exceeds the maximum lawful rate permitted by law, Debtor
and Secured Party shall, to the full extent permitted by applicable law,
exclude voluntary prepayment and the effects thereof and amortize, prorate,
allocate and spread, in equal parts, the total amount of interest throughout
the entire contemplated term of this Note so that the interest rate is uniform
throughout the entire term of this Note.  If it is so determined that any
interest in excess of such maximum lawful rate is provided for, then such
excess shall be applied first to any other amounts not constituting interest
due or which may become due under this Note or the Agreement and the balance,
if any, shall be refunded to Debtor; provided, however, that in no event shall
Debtor be obligated to pay, and Secured Party hereby waives payment of, the
amount of interest to the extent it is in excess of the amount permitted by
applicable law.  No provision in this Note or the Agreement shall require or
permit the collection of interest in excess of the maximum lawful rate.

       This Note may be prepaid by the Debtor in accordance with Section 1.3(c)
of the Agreement only if all amounts owing with respect to this Note, the
Agreement and the other Security Instruments are paid in full.  Except as
otherwise provided for herein and in the Agreement, this Note shall not be
subject to prepayment.

       THIS NOTE, THE AGREEMENT AND THE SECURITY INSTRUMENTS AND ALL MATTERS
RELATING THERETO SHALL, EXCEPT TO THE EXTENT OTHERWISE REQUIRED BY APPLICABLE
LAW, BE GOVERNED BY AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH THE LAWS
OF THE STATE OF NORTH CAROLINA WITHOUT REGARD TO CONFLICT OF LAWS PRINCIPLES.
DEBTOR HEREBY SUBMITS TO THE JURISDICTION AND VENUE OF THE STATE AND FEDERAL
COURTS OF NORTH CAROLINA AND AGREES THAT THE SECURED PARTY MAY, AT ITS OPTION,
ENFORCE ITS RIGHTS HEREUNDER AND UNDER THE AGREEMENT AND THE OTHER SECURITY
INSTRUMENTS IN SUCH COURTS.  DEBTOR HEREBY IRREVOCABLY WAIVES THE DEFENSE OF AN
INCONVENIENT FORUM TO MAINTENANCE OF ANY ACTION OR PROCEEDING BY SECURED PARTY
IN SUCH COURTS.  DEBTOR HEREBY IRREVOCABLY WAIVES ALL RIGHT TO TRIAL BY JURY IN
ANY ACTION, PROCEEDING OR COUNTERCLAIM ARISING OUT OF OR RELATING TO THIS NOTE,
THE AGREEMENT OR ANY OTHER SECURITY INSTRUMENT OR ANY OF THE TRANSACTIONS
CONTEMPLATED HEREBY OR THEREBY.





<PAGE>   40
       IN WITNESS WHEREOF, the Debtor has caused this Note to be executed as of
the date appearing above.

                                            SEITEL GEOPHYSICAL, INC.
                                            
                                            
                                            By:
                                               --------------------------------
                                            
                                            Name (Printed):                    
                                                           --------------------
                                            
                                            Title:                             
                                                  -----------------------------





<PAGE>   41
                               SCHEDULE 1.3(b)(i)

                              NOTICE OF BORROWING


NationsBanc Leasing Corporation of
  North Carolina
101 South Tryon Street, NC1-002-38-20
Charlotte, North Carolina 28255
Attn:  Manager of Corporate Lease Administration
Facsimile No.: (704) 386-0892

Re:    Notice of Borrowing under Loan and Security Agreement dated as of July
       ___, 1996 (the "Loan Agreement") between Seitel Geophysical, Inc.
       ("Debtor") and NationsBanc Leasing Corporation of North Carolina
       ("Secured Party")

Dear Sir:

The Debtor hereby requests an advance under the above-referenced Loan Agreement
in accordance with the following information:

       1.        Debtor:                                            
                         -------------------------------------------

       2.        Date of Requested Advance:                         
                                            ------------------------

       3.        Amount of Requested Advance:                       
                                              ----------------------

       4.        Bill of Sale Supporting Requested Advance:  See Attached Rider

The Debtor hereby certifies that as of the date hereof no Default or Event of
Default currently exists under the Loan Agreement and no Default or Event of
Default shall exist as a result of the making of the Requested Advance.

                                   Sincerely,

                                    [DEBTOR]






<PAGE>   1
                                                                 SCHEDULE 10.1.2

                             ASSUMPTION AND CONSENT


         THIS ASSUMPTION AND CONSENT is entered into effective as of December
31, 1996 (this "Agreement") and is by and among SEITEL GEOPHYSICAL, INC., a
Delaware corporation ("Seitel"), EAGLE GEOPHYSICAL, INC., a Delaware
corporation ("Eagle"), NATIONSBANC LEASING CORPORATION OF NORTH CAROLINA, a
North Carolina corporation ("NBLC") and SEITEL, INC., a Delaware corporation
(the "Guarantor").

         All defined terms used herein but not otherwise defined shall have the
meaning set forth in that certain Loan and Security Agreement dated as of July
9, 1996 (the "Loan Agreement") between Seitel, as debtor, and NBLC, as secured
party.

                              W I T N E S S E T H:

         WHEREAS, Seitel and NBLC are parties to the Loan Agreement.

         WHEREAS, the Guarantor has provided to NBLC a guaranty of all amounts
due and payable by Seitel under the Loan Agreement, the Notes and all other
documents executed in connection therewith.

         WHEREAS, Seitel wishes to assign to Eagle all of its right, title,
interests and obligations in, to and under the Loan Agreement, the Notes, the
Bills of Sales and the Equipment and Eagle wishes to accept such assignment.

         WHEREAS, the parties hereto entered into this Assumption and Consent
to, among other things, (a) acknowledge and consent to the assignment from
Seitel to Eagle and (b) provide for the Guarantor to acknowledge its continuing
obligations under the Guaranty with respect to Eagle.

                               A G R E E M E N T

         NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledge, the parties hereto agree as
follows:

         1.      Assignment and Assumption.  Seitel, in its capacity as Debtor
under the Loan Agreement, the Notes and all other documents executed in
connection therewith, hereby assigns to Eagle all of Seitel's right, title,
interests and obligations in, to and under the Loan Agreement, the Notes, the
Bills of Sale and the Equipment in accordance with that certain Contribution
and Assumption Agreement effective as of December 31, 1996 (the "Contribution
Agreement") between Seitel and Eagle.  Eagle hereby acknowledges and agrees
that from and after December 31, 1996 (the "Effective Date") it shall be a
party to and Debtor under the Loan Agreement, the Notes, the Bills of Sale and
all other documents executed in connection therewith and agrees to be bound by
all of the terms of, and to assume and undertake all the obligations and
liabilities of,
<PAGE>   2
the Debtor as set forth therein whether such obligations and liabilities arise
prior to, on or after the Effective Date.

         2.      Consent to Assignment.  NBLC hereby consents to the assignment
by Seitel to Eagle of all of Seitel's right, title, interests and obligations
in, to and under the Loan Agreement, the Notes, the Bills of Sale, the
Equipment and all other documents executed in connection therewith.

         3.      Acknowledgement by Guarantor.  The Guarantor hereby
acknowledges and consents to the Contribution Agreement and this Agreement.
Further, the Guarantor agrees that the Guaranty Agreement dated as of July 9,
1996 from the Guarantor to NBLC guaranteeing all obligations of Seitel to NBLC
shall guarantee all obligations of Eagle to NBLC as if Eagle were the original
beneficiary of such Guaranty.

         4.      Representations, Warranties and Covenants.  Eagle, as Debtor,
and the Guarantor hereby represent and warrant that as of the date hereof (a)
the representations and warranties of the Debtor set forth in Section 3.1 of
the Loan Agreement are true and correct in all material respects, (b) Debtor
shall comply with all covenants set forth in Sections 3.2 and 3.3 of the Loan
Agreement and (ii) no Default or Event of Default currently exists and is
continuing with respect to the Debtor or the Guarantor.

         5.      Conditions Precedent.  The effectiveness of this Agreement is
contingent upon the receipt by NBLC of the following items, each in form and
substance satisfactory to NBLC: (a) the Contribution Agreement duly executed by
the parties thereto; (b) this Agreement duly executed by the parties hereto;
(c) Amended, Restated and Substituted Secured Term Note A duly executed by
Eagle in favor of NBLC; (d) Amended, Restated and Substituted Secured Term Note
B duly executed by Eagle in favor of NBLC; (e) an Officer's Certificate of
Eagle stating that (i) no Default or Event of Default has occurred and is
continuing and (ii) the assignment to and assumption by Eagle complies with the
terms and conditions of Section 3.3(k) of the Loan Agreement; (f) a Secretarial
Certificate of Eagle certifying as true and accurate the Articles of
Incorporation, By-Laws and Resolutions of Eagle, which such resolutions shall
authorize the transactions contemplated by this Agreement; (f) Good Standing
Certificates from Eagle's state of incorporation and each state where it is
required to qualify in order to do business; (g) a legal opinion of counsel to
Eagle and the Guarantor in form and substance satisfactory to NBLC; and (h)
such other certificates, financing statements, resolutions and opinions as
deemed necessary or advisable by NBLC.

         6.      Counterparts.  This Agreement may be executed in any number of
counterparts, each of which when executed and delivered shall be deemed to be
an original and it shall not be necessary in making proof of this Agreement to
produce or account for more than one such counterpart.

         7.      No Other Amendments.  Except as modified hereby, all of the
terms and conditions of the Operative Agreements shall remain in full force and
effect.





                                       2
<PAGE>   3
         8.      Governing Law.  This Agreement shall be governed by, and
construed in accordance with, the laws of the State of North Carolina.



       [The remainder of this page has been intentionally left blank.]





                                       3
<PAGE>   4
         IN WITNESS WHEREOF, each of the parties hereto has caused this
Agreement to be duly executed and delivered as of the Effective Date.


                                         SEITEL GEOPHYSICAL, INC.         
                                                                          
                                                                          
                                         By: /s/ JAY N. SILVERMAN            
                                            ------------------------------
                                         Name:   Jay N. Silverman           
                                              ----------------------------
                                         Title:  President                 
                                               ---------------------------
                                                                          
                                                                          
                                         EAGLE GEOPHYSICAL, INC.          
                                                                          
                                                                          
                                         By: /s/ JAY N. SILVERMAN            
                                            ------------------------------
                                         Name:   Jay N. Silverman           
                                              ----------------------------
                                         Title:  President                 
                                               ---------------------------
                                                                          


ACKNOWLEDGED, AGREED AND CONSENTED TO:

SEITEL, INC.


By: /s/ DEBRA D. VALICE                                             
   ------------------------------
Name:   Debra D. Valice                              
     ----------------------------
Title:  Sr. Vice President - CFO                             
      ---------------------------


NATIONSBANC LEASING CORPORATION
  NORTH CAROLINA


By: /s/ GEORGE L. ROBINSON JR.             
   ------------------------------
Name:   George L. Robinson Jr.                                       
     ----------------------------
Title:  Senior Vice President                                      
      ---------------------------





                                       4

<PAGE>   1

                                                                            10.2





                          LOAN AND SECURITY AGREEMENT

                                    between

                            EAGLE GEOPHYSICAL, INC.,
                                   as Debtor,

                                      and

               NATIONSBANC LEASING CORPORATION OF NORTH CAROLINA,
                                as Secured Party

                          dated as of February 6, 1997





<PAGE>   2
                               TABLE OF CONTENTS


<TABLE>
<S>                                                                                                                    <C>
ARTICLE I  DEFINED TERMS; CREDIT FACILITIES; CONDITIONS PRECEDENT . . . . . . . . . . . . . . . . . . . . . . . . . .   4
         SECTION 1.1  Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
         SECTION 1.2  Other Terms.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
         SECTION 1.3  Term Loans  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
         SECTION 1.4  Conditions Precedent  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10

ARTICLE II  SECURITY INTEREST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
         SECTION 2.1  Grant of Security Interest  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
         SECTION 2.2  Security for Secured Obligations  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
         SECTION 2.3  Security Interest Absolute  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
         SECTION 2.4  Debtor as Agent for Secured Party . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14

ARTICLE III  REPRESENTATIONS, WARRANTIES AND COVENANTS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
         SECTION 3.1  Debtor's Representations and Warranties . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
         SECTION 3.2  Affirmative Covenants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
         SECTION 3.3  Negative Covenants  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18

ARTICLE IV  INSURANCE, TRANSFER, CONDEMNATION AND EVENT OF LOSS . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
         SECTION 4.1  Insurance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
         SECTION 4.2  Transfer of Collateral  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
         SECTION 4.3  Condemnation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
         SECTION 4.4  Certain Events of Loss  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21

ARTICLE V  EVENTS OF DEFAULT AND REMEDIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
         SECTION 5.1  Events of Default . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
         SECTION 5.2  Remedies  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  23
         SECTION 5.3  Proceeds of Collateral  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  25
         SECTION 5.4  Waiver of Rights; Receiver  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  25

ARTICLE VI  INDEMNITY AND EXPENSES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  26
         SECTION 6.1  General Indemnity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  26
         SECTION 6.2  General Tax Indemnity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  26

ARTICLE VII  FURTHER ASSURANCES; ATTORNEY-IN-FACT; DISCHARGE  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27
         SECTION 7.1  Further Assurances  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27
         SECTION 7.2  Secured Party Appointed Attorney-in-Fact  . . . . . . . . . . . . . . . . . . . . . . . . . . .  28
         SECTION 7.3  Secured Party May Perform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  28
         SECTION 7.4  Secured Party's Duties  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  28
         SECTION 7.5  Continuing Security Interest; Transfer of Note; Termination . . . . . . . . . . . . . . . . . .  28

ARTICLE VIII  MISCELLANEOUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  29
         SECTION 8.1  Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  29
         SECTION 8.2  Risk of Loss  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  29
         SECTION 8.3  Powers and Agencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  29
         SECTION 8.4  Entire Agreement  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  29
         SECTION 8.5  Lawful Interest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
         SECTION 8.6  Survival; Severability  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
         SECTION 8.7  Binding Effect  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
         SECTION 8.8  Amendment and Waiver  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
         SECTION 8.9  Headings; Execution in Counterpart  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  31
         SECTION 8.10 Transaction Costs   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  31
</TABLE>
<PAGE>   3
<TABLE>
         <S>           <C>                                                                                             <C>
         SECTION 8.11  APPLICABLE LAW; CONSENT TO JURISDICTION AND VENUE; WAIVER OF JURY TRIAL  . . . . . . . . . . .  31
         SECTION 8.12  Break-Funding Costs  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  31
         SECTION 8.13  Intention of the Parties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  31
</TABLE>


EXHIBIT A - Equipment Description
Schedule 1.3 - Notice of Borrowing
Schedule 1.3(a) - Form of Secured Term Note A
Schedule 1.3(b) - Form of Secured Term Note B
<PAGE>   4
                          LOAN AND SECURITY AGREEMENT


         THIS LOAN AND SECURITY AGREEMENT dated as of February 6, 1997 (as
amended, modified, supplemented, restated and/or replaced from time to time,
the "Agreement") is between EAGLE GEOPHYSICAL, INC., a Delaware corporation
("Debtor"), and NATIONSBANC LEASING CORPORATION OF NORTH CAROLINA, a North
Carolina corporation ("Secured Party").

PRELIMINARY STATEMENTS:

         (1)     Debtor has requested that Secured Party make loans in the
aggregate principal amount of $7,563,920.18 to Debtor pursuant to the terms of
the Agreement as evidenced by promissory notes in such amount to finance
Debtor's acquisition of the Equipment (hereinafter defined).

         (2)     Secured Party has agreed to make the Loans to Debtor on the
condition, among other things, that Debtor shall have executed and delivered
the Notes (hereinafter defined) payable to Secured Party, this Agreement, any
required amendment or supplement hereto Granting (hereinafter defined) Secured
Party a first priority security interest in the Collateral (hereinafter
defined), related UCC-1 financing statements and other filings reasonably
deemed necessary or prudent by Secured Party to perfect such security interest.

         NOW, THEREFORE, in consideration of the premises and for other good
and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, Debtor and Secured Party hereby agree as follows:

                                   ARTICLE I

             DEFINED TERMS; CREDIT FACILITIES; CONDITIONS PRECEDENT

         SECTION 1.1  DEFINITIONS.

         When used in this Agreement,  the  following  capitalized  terms
shall  have  the  following meanings (such meanings to be equally applicable to
both the singular and plural forms of the terms defined):

         "Affiliate" means a Person (i) which directly or indirectly through
one or more intermediaries controls, or is controlled by, or is under common
control with, Debtor; (ii) which beneficially owns or holds 10% or more of any
class of the voting stock of Debtor, or (iii) of which 10% or more of the
voting stock is beneficially owned or held by Debtor or a Subsidiary.

         "Amortization Rate" means (i) for Term  Loan  A,  the  interpolated
generic  two  year  U.S. Treasury yield as quoted by the Dow Jones/Telerate
Inc. system at approximately 11:00 a.m. (Charlotte, North Carolina time) five
(5) Business Days prior to the Term Loan A Draw Termination Date plus 1.48% and
(ii) for Term Loan B, the interpolated generic three year U.S. Treasury yield
as quoted by the Dow Jones/Telerate Inc. system at approximately 11:00 a.m.
(Charlotte, North Carolina time) plus 1.56%, in each case expressed on a per
annum basis; or, if such data for any reason ceases to be available on the Dow
Jones/Telerate Inc. system, the applicable U.S. Treasury yield shall be
determined from any publicly available  source  of  similar market data
selected by Secured Party; provided, however, to the extent any such date on
which the U.S. Treasury yield is to be determined is not a Business Day, then
the applicable U.S. Treasury  yield  in  effect  on  the immediately preceding
Business Day shall be the effective yield.

         "Assigned Agreements" has the meaning set forth in Section 2.1 lb)
hereof.

         "Beneficiary" has the meaning set forth in Section 6.1 hereof.
<PAGE>   5
         "Bills of Sale" means each warranty bill of sale in favor of the
Debtor duly executed by the Seller of the Equipment or other evidence of title
transfer satisfactory to Secured Party.

         "Break-Funding Costs" means, in the case of any voluntary prepayment
of all or any portion of the unamortized balance of the Loans, an amount
reasonably Secured Party as shall compensate Secured Party as a result of the
inability of Secured Party in its reasonable discretion to redeploy the amount
so prepaid at an interest rate  equal  to  or greater  than  the  interest rate
on the applicable Loan and for a term equal to the remaining average life of
the applicable Loan.

         "Business Day" means any day other than a day on which banking
institutions in the states of North Carolina or Georgia are authorized or
required by law to close.

         "Closing Date" means February 6, 1997.

         "Collateral" shall have the meaning set forth in Section 2.1 hereof.

         "Default" shall mean an event or occurrence which upon the giving of
notice and/or the of time shall constitute an Event of Default.

         "Equipment" means all items of equipment described in Exhibit A
attached hereto, together with any replacement parts which may from time to
time be incorporated in such equipment and title to which shall have vested in
Debtor.

         "Equipment Cost" means, with respect to any item of Equipment, an
amount equal to the sum of (a) the total cost paid by Debtor for such item of
Equipment plus b) all excise, sales and use taxes and registration fees paid by
Debtor on or with respect to the acquisition of such item of Equipment, both as
evidenced by  invoices,  appraisals  and/or bills  of  sale  in  form  and
substance reasonably satisfactory to Secured Party.

         "ERISA" has the meaning set forth in Section 3.1 (t) hereof.

         "Eurodollar Rate" for a particular day means the rate per annum
(rounded upwards, if necessary, to the nearest 1/100 of 1%) appearing on
Telerate Page 3750 (or any successor page) as the London interbank offered rate
for deposits in U.S. dollars at approximately 11:00 a.m. (London  time) for a
period of one month an amount substantially equal to the requested Term Loan A
advance or the requested Term Loan B advance, as appropriate.  If for any
reason such rate is not available, the term "Eurodollar Rate" shall mean the
rate per annum (rounded upwards, if necessary, to the nearest 1/100 of 1%)
appearing on Reuters Screen LIBO Page as the London interbank offered rate for
deposits in U.S. dollars at approximately 11:00 a.m. (London time) for a period
of one month and in an amount substantially equal to the requested Term Loan A
Advance or the requested Term Loan B advance, as appropriate; provided,
however, if more than one rate is specified on Reuters Screen LIBO Page, the
applicable rate shall be the arithmetic  mean of all such rates.

         "Event of Default" has the meaning set forth in Section 5.1 hereof.

         "Event of Loss" with respect to an item of Equipment means any of the
following events: (i) loss of any item of Equipment or of the use thereof due
to theft or disappearance prior to the expiration or termination of this
Agreement, or the non-existence of any item of Equipment at the expiration or
termination of this Agreement, (ii) destruction, damage beyond repair, or
rendition of any item of Equipment permanently unfit for normal use for any
reason whatsoever, (iii) any damage to any item of Equipment which results in
an insurance settlement with respect to such item of Equipment on the basis of
a total loss, or (iv) the condemnation, confiscation, seizure, or requisition
of use or title to any item of Equipment by any governmental authority under
the power of eminent domain or otherwise.





                                       5
<PAGE>   6
         "Event of Loss Payment Date" has the meaning set forth in Section 4.3
hereof.

         "Grant" means to grant, bargain, sell, warrant, remise, release,
convey, assign, transfer, mortgage, pledge, deposit, set over, confirm or
create a security interest under the North Carolina UCC.  A grant with respect
to any instrument, document or agreement shall include all rights, powers and
options (but none of the obligations) of the granting party thereunder,
including without limitation the right to generally do anything which the
granting party then is or thereafter may be entitled to do thereunder or with
respect thereto.

         "Guarantor" means Seitel, Inc., a Delaware corporation.

         "Guaranty" means the Guaranty Agreement dated as of the date hereof,
as such may be amended, modified, supplemented, restated and/or replaced from
time to time, executed by Guarantor for the benefit of Secured Party.

         "Installment Payment Date" means the last day of each calendar month
with respect to Term Loan A and/or Term Loan B.

         "Lien" means any lien, claim, charge, security  interest, mortgage
and/or other encumbrance.

         "Loans" means each of Term Loan A and Term Loan B.

         "North Carolina UCC" or "UCC" means the North Carolina Uniform
Commercial Code, N.C. Gen. Stat. Chapter 25, Articles 1-11, as now in effect
and as hereafter amended from time to time.

         "Notes" means each of Secured Term Note A and Secured Term Note B.

         "Notice of Borrowing" means a notice of borrowing delivered pursuant
to Section 1.3(a) or 1.3(b) substantially in the form of Schedule 1.3 hereto.

         "PBGC" has the meaning set forth in Section 3.1 (t) hereof.

         "Permitted Contest" means any contest by Debtor with respect to any
Lien, tax or imposition referred to in Section 6.2 hereof, so long as Debtor
shall contest, in good faith and at its expense, the existence, the amount or
the validity thereof, the amount of the damages caused thereby, or the extent
of its liability therefor, by appropriate Proceedings which do not result in
(i) the collection of, or other realization upon, the tax, assessment, levy,
fee, rent or Lien so contested, (ii) the sale, forfeiture or loss of any item
of Equipment or any material part thereof, or (iii) any interference with the
use of any item of Equipment or any material part thereof.

         "Permitted Encumbrances", with respect to the Collateral, means (i)
this Agreement and any assignment permitted hereby, (ii) any Lien affecting the
Collateral for work or service performed or materials furnished securing
amounts which are not yet due and payable or which are not otherwise delinquent
and (iii) any Lien which is the subject of a Permitted Contest and (iv) any
other Lien incurred in the ordinary course of business which such Lien does not
exceed $50,000.

         "Permitted Lease" shall mean a lease of all the Equipment or any
portion thereof entered into between Debtor and a Permitted Lessee; provided,
that the following conditions shall be met with respect to each such lease: (i)
Secured Party shall have given its prior written consent to such lease; (ii)
upon the effective date of such lease, there shall exist no Default or Event of
Default and no Liens on any of the Collateral other than the Permitted
Encumbrances; (iii) each such lease shall specify explicitly as a condition to
the effectiveness of such lease that (A) Debtor shall remain fully obligated
and in compliance with the terms and conditions of this Agreement and (B) upon
Secured Party's delivery to the lessee of notice specifying that an Event of
Default has occurred and is continuing and that the Secured Party has commenced
the exercise of remedies with respect to the Equipment, such lease will





                                       6
<PAGE>   7
automatically terminate and be of no further force or effect and the lessee
will cause each item of Equipment then subject to such lease to be delivered to
Secured Party at a place to be designated by Secured Party.

         "Permitted Lessee" shall mean any Person which (i) is domiciled in the
United States, (ii) in Debtor's reasonable opinion, is financially responsible
and (iii) at the time Debtor enters into such lease, is not the subject of any
filing by or against such Person of a petition under any federal bankruptcy law
or any federal law replacing or superseding such law or any state bankruptcy
law in which such Person is named as debtor.

         "Person" means an individual or a corporation, partnership, trust,
association, joint venture, joint stock company, firm or other enterprise or
government (or a political subdivision or any agency, department or
instrumentality thereof) or other entity of any kind.

         "Plan" means any "employee benefit pension plan" or other "plan"
(including a "multiemployer plan" as defined in Section 3(37) of ERISA)
established or maintained, as to which contributions have been made, by Debtor
or any Affiliate for either of their respective employees and which is covered
by Title IV of ERISA or to which Section 412 of the Internal Revenue Code of
1986, as amended applies.

         "Proceeding" means any suit in equity, action at law or other judicial
or administrative proceeding.

         "Replacement Equipment" means an item (i) of comparable make, model
and manufacture as the item of Equipment with respect to which an Event of Loss
has occurred, (ii) selected by Debtor and consented to by Secured Party, such
consent not to be unreasonably withheld or delayed, (iii) owned by Debtor free
and clear of all Liens and other encumbrances other than Permitted Encumbrances
and (iv) having a value, utility and useful life at least equal to, and being
in as good operating condition as, the item of Equipment with respect to which
the Event of Loss occurred, assuming such item of Equipment was in the
condition and repair required by the terms hereof immediately prior to the
occurrence of the Event of Loss.

         "Secured Obligations" has the meaning set forth in Section 2.2 hereof.

         "Secured Party" means NationsBanc Leasing Corporation of North
Carolina, a North Carolina corporation, and its successors and assigns.

         "Security Instrument" means each of this Agreement, and any other
instrument, document, financing statement or agreement with respect to which
any  right  or  interest  in  or  with  respect  to the Collateral has been
Granted to Secured Party or has been recorded with the appropriate  filing
office.

         "Secured Term Note A" means the promissory note of the  Debtor in
favor of the Secured Party dated the Closing Date evidencing Term  Loan  A  as
provided  pursuant  to  Section  1.3(a)(iii),  as  amended, modified,
supplemented, extended, renewed or replaced from time to time.

         "Secured Term Note B" means the promissory note of the Debtor in favor
of the Secured Party dated the Closing Date evidencing Term Loan B as provided
pursuant to Section  1.3(b)(iii), as amended, modified, supplemented, extended,
renewed or replaced from time to time.

         "Seller" means each Person executing a Bill of Sale in favor of Debtor
with respect to any Equipment.

         "Subsidiary" means any corporation, limited liability company,
partnership, joint venture, trust or estate of which (i) more than  50% of the
outstanding capital stock having ordinary voting power to elect a majority of
the board of directors of such corporation; or (ii) the interest in the capital
or profits of such corporation, limited liability company, partnership or joint
venture; or (iii) the beneficial interest of such trust or estate is owned
directly or indirectly by Guarantor and/or one of its Subsidiaries.





                                       7
<PAGE>   8
         "Taxes or Other Impositions" has the meaning set forth in Section 6.2
hereof.

         "Term Loan A" means the term loan made pursuant to the provisions of
Section 1.3(a).

         "Term Loan A Commitment" has the meaning set forth in Section 1.3(a)
hereof.

         "Term Loan B" means the term loan made pursuant to the provisions of
Section 1.3(b).

         "Term Loan B Commitment" has the meaning set forth in Section 1.3(b)
hereof.

         "Term Loan A Draw Termination Date" has the meaning set forth in
Section 1.3(a) hereof.

         "Term Loan B Draw Termination Date" has the meaning set forth in
Section 1.3(b) hereof.

         "Termination Value" means, with respect to any or all item(s) of
Equipment, an amount equal to the Equipment Cost of such item(s) of Equipment
multiplied by the Termination Value Percentage as of such Installment Payment
Date.

         "Termination Value Percentage" means the termination value percentage
for Term Loan A and/or Term Loan B, as appropriate, as of each Installment
Payment Date calculated as of the date on which the Amortization Rate is
determined for each of Term Loan A and Term Loan B.

         SECTION 1.2  OTHER TERMS.

         Unless otherwise defined in this Agreement, all terms defined in the
North Carolina UCC and used in this Agreement have the meanings set forth in
the North Carolina UCC.

         SECTION 1.3  TERM LOANS.

                 (a)      Term Loan A. Subject to and upon the terms and
         conditions and relying upon the representations and warranties herein
         set forth, the Secured Party agrees to make advances ("Term Loan A")
         to the Debtor from time to time from the Closing Date to and including
         February 28, 1997 (as such date may be extended from time to time in
         the sole discretion of the Secured Party, the "Term Loan A Draw
         Termination Date") in an aggregate principal amount of up to FIVE
         HUNDRED FIFTY-SEVEN THOUSAND SEVEN HUNDRED SIXTY-EIGHT AND 14/100
         DOLLARS ($557,768.14) (the "Term Loan A Commitment") for the purposes
         hereinafter set forth.  Amounts repaid on Term Loan A may not be
         reborrowed.

                          (i)     Term Loan A Advances.  So long as the
                 conditions to advances have been satisfied, the Secured Party
                 will make Term Loan A advances to the Debtor from time to time
                 from the Closing Date to the Term Loan A Draw Termination Date
                 upon submission of a Notice of Borrowing substantially in the
                 form of Schedule 1.3 to the Secured Party five (5) Business
                 Days prior to the date of the requested advance.  Each such
                 notice shall specify (A) the date of the requested advance
                 (which shall be a Business Day), (B) shall not exceed, taking
                 into account all prior Term Loan A advances, the Term Loan A
                 Commitment, (C) shall be in a minimum amount of $100,000 and
                 (D) shall be accompanied by any supporting invoices and
                 requisitions relating to the requested advance.  The Secured
                 Party shall make such Term Loan A advances available by
                 deposit to the Debtor's account at the office of Bank One,
                 Texas, N.A. in Houston, Texas.

                 (ii)     Payment of Principal and Interest.





                                       8
<PAGE>   9
                          (A)     Interest During Draw Period.  Term Loan A
                 shall be subject to a draw period during which accrued
                 interest shall be payable monthly in arrears on the last day
                 of each calendar month beginning with the first of such dates
                 to occur after the Closing  Date.  Interest during such draw
                 period shall accrue at the applicable Eurodollar Rate plus
                 1.30% (computed on the basis of the actual number of days
                 elapsed over a year of 360 days) with respect to the Term Loan
                 A advance made on the Closing Date and with respect to each
                 Term Loan A advance made thereafter throughout the draw
                 period.  The Eurodollar Rate applicable to the Term Loan A
                 advance  made on the Closing Date shall be determined five (5)
                 Business Days prior to the Closing Date.  The Eurodollar Rate
                 applicable to each Term Loan A advance made after the Closing
                 Date shall be determined five (5) Business  Days prior to the
                 date of the requested advance.

                          (B)     Principal and Interest after Draw Period.
                 The Term Loan A Commitment shall bear interest at a fixed rate
                 equal to the Amortization Rate.  The Amortization Rate for
                 Term Loan A shall be determined five (5) Business Days prior
                 to the Term Loan A Draw Termination Date.  Principal and
                 interest on Term Loan A shall be amortized and payable in
                 thirty-six (36) consecutive level monthly installments
                 beginning with the payment due on March 31, 1997.  Payments
                 received on Term Loan A shall be applied first to accrued
                 interest and then to principal in inverse order of maturity.

                 Upon the occurrence and during the continuation of an Event of
         Default hereunder, the principal of and, to the extent permitted by
         law, interest on Term Loan A hereunder shall bear interest, payable on
         demand, at a rate equal to 2.0% per annum in excess of the rate
         otherwise applicable hereunder.

                          (iii)   Secured Term Note A.  Term Loan A shall be
                 evidenced by a duly executed promissory note of the Debtor to
                 the Secured Party dated the Closing Date in an original
                 principal amount equal to the Term Loan A Commitment and
                 substantially in the form of Schedule 1.3(a) hereto.

                 (b)      Term Loan B.  Subject to and upon the terms and
         conditions and relying upon the representations and warranties  herein
         set forth, the Secured Party agrees to make advances ("Term Loan B")
         to the Debtor from time to time from the Closing Date to and including
         April 30, 1997 (as such date may be extended from time to time in the
         sole discretion of the Secured Party, the "Term Loan B Draw
         Termination Date") in an aggregate principal amount of up to SEVEN
         MILLION SIX THOUSAND ONE HUNDRED FIFTY-TWO AND 04/100 DOLLARS
         ($7,006,152.04) (the "Term Loan B Commitment") for the purposes
         hereinafter set forth.  Amounts repaid on Term Loan B may not be
         reborrowed.

                          (i)     Term Loan B Advances.  So long as the
                 conditions to advances have been satisfied, the Secured Party
                 will make Term Loan B advances to the Debtor from time to time
                 from the  Closing Date to the Term Loan B Draw Termination
                 Date upon submission of a Notice of Borrowing substantially in
                 the form of Schedule 1.3 to the Secured Party five (5)
                 Business Days prior to the date of the requested advance.
                 Each such notice shall specify (A) the date of the requested
                 advance (which shall be a Business Day), (B) shall not exceed,
                 taking into  account all prior Term Loan B advances, the Term
                 Loan B Commitment, (C) shall be in a minimum amount of
                 $100,000 and (D) shall be accompanied by any supporting
                 invoices and requisitions relating to the requested advance.
                 The Secured Party shall make such Term Loan B advances
                 available by deposit to the Debtor's account at the office of
                 Bank One, Texas, N.A. in Houston, Texas.

                 (ii)     Payment of Principal and Interest.

                          (A)     Interest during Draw Period.  Term Loan B
                 shall be subject to a draw period during which accrued
                 interest shall be payable monthly in arrears on the last day
                 of each calendar month beginning with the first of such dates
                 to occur after the Closing Date.  Interest during such





                                       9
<PAGE>   10
                 draw period shall accrue at the applicable Eurodollar Rate
                 plus 1.30% (computed on the basis of the actual number of days
                 elapsed over a year of 360 days) with respect to the Term Loan
                 B advance made on the closing Date and with respect to each
                 Term Loan B advance  made thereafter throughout the draw
                 period.  The Eurodollar Rate applicable to the Term Loan B
                 advance made on the Closing Date shall be determined five (5)
                 Business Days prior to the Closing Date.  The Eurodollar  Rate
                 applicable to each Term Loan B advance made after the Closing
                 Date shall be determined five (5) Business Days prior to the
                 date of the requested advance.

                          (B)     Principal and Interest after Draw Period. The
                 Term Loan B Commitment shall bear interest at a fixed rate
                 equal to the Amortization Rate.  The Amortization Rate for
                 Term Loan B shall be determined five (5) Business Days prior
                 to the Term Loan 8 Draw Termination Date.  Principal and
                 interest on Term Loan B shall be amortized and payable in
                 sixty (60) consecutive level monthly installments beginning
                 with the payment due on May 31, 1997.  Payments received on
                 Term Loan B shall be applied first to accrued interest and
                 then to principal in inverse order of maturity.

                 Upon the occurrence  and  during  the  continuation  of  an
         Event  of  Default hereunder, the principal of and, to the extent
         permitted by law, interest on Term Loan B shall bear interest, payable
         on demand, at a rate equal to 2.0% per annum in excess of the rate
         otherwise applicable hereunder.

                          (iii)   Secured Term Note B.  Term Loan B shall be
                 evidenced by a duly executed promissory note of the Debtor to
                 the Secured Party dated the Closing Date in an original
                 principal amount equal to the Term Loan B Commitment and
                 substantially in the form of Schedule 1.3(b) hereto.

                 (c)      Early  Termination.  (i) On any Installment Payment
         Date on or after the second anniversary of the Closing Date, Debtor
         may, upon sixty (60) days' prior written notice to Secured Party,
         terminate the Loans and this Agreement.  Debtor shall pay to Secured
         Party on the applicable Installment Payment Date the sum of: (A) the
         Termination Value as of such Installment Payment Date, plus (B) any
         Break-Funding Costs, plus (C) any accrued but unpaid interest with
         respect to either Loan, plus (D) all other obligations owing under the
         Agreement on the termination date.  Upon receipt of the amounts set
         forth in (A)-(D) above, Secured Party shall release its Lien on the
         Collateral.

                 (ii) On any Installment Payment Date on or after the second
         anniversary of the Closing Date, Debtor may, upon sixty (60) days'
         prior written notice to Secured Party, prepay a portion of the Loans
         in accordance with the terms hereof.  Debtor shall have the option to
         make up to three (3) prepayments in the aggregate on the Loans, each
         prepayment in an amount not less than $200,000.  Debtor shall pay to
         Secured Party on the applicable Installment Payment Date the sum of:
         (A) the prepayment amount, plus (B) any Break-Funding Costs, plus (C)
         any accrued but unpaid interest with respect to the prepayment.
         Amounts so prepaid under this subsection (c)(ii) shall be applied to
         outstanding obligations owing under this Agreement in the reasonable
         discretion of the Secured Party.

         SECTION 1.4  CONDITIONS PRECEDENT.

         The obligation of Secured Party to make any Loan advance shall be
subject to the following conditions, as appropriate:

                 (a)      Conditions to All Advances on Closing Date.  Each
         Loan advance on the Closing Date shall be subject to the delivery to
         Secured Party of the following originally executed documents (unless
         otherwise noted) each in form and substance satisfactory to Secured
         Party and the satisfaction of the other conditions set forth herein:





                                       10
<PAGE>   11
                          (i)     the Agreement;

                          (ii)    the Notes;

                          (iii)   the Guaranty;

                          (iv)    evidence of payment (or evidence of
                 exemption) of any and all sales, transfer, use, documentation
                 or similar taxes due in connection with the acquisition of the
                 Equipment by Debtor;

                          (v)     a secretarial certificate from Debtor: (A)
                 certifying Debtor's articles of incorporation, by-laws and
                 resolutions, with such resolutions authorizing the overall
                 transaction and Debtor's execution, delivery and performance
                 of this Agreement and (B) containing an incumbency
                 certification of Debtor with the name(s), title(s) and
                 specimen signature(s) of the person or persons authorized on
                 behalf of Debtor to execute this Agreement.

                          (vi)    an officer's certificate from Debtor: (A)
                 stating that no material adverse change has occurred in the
                 condition of Debtor (financial or otherwise) since the date of
                 the last financial statement of Guarantor which has been
                 delivered to Secured Party which would impair the ability of
                 Debtor to pay and perform its obligations under this Agreement
                 and (B) stating that no Default or Event of Default shall have
                 occurred and be continuing as of such date;

                          (vii)   a secretarial certificate from Guarantor:
                 (A) certifying Guarantor's articles of incorporation, by-laws
                 and resolutions, with such resolutions authorizing the overall
                 transaction and Guarantor's execution, delivery and
                 performance of the Guaranty and (B) containing an incumbency
                 certification of Guarantor with the name(s), title(s) and
                 specimen signature(s) of the person or persons authorized on
                 behalf of Guarantor to execute the Guaranty;

                          (viii)  an officer's certificate from Guarantor:  (A)
                 stating that no material adverse change has occurred in the
                 condition of Guarantor (financial or otherwise) since the date
                 of the last financial statement of Guarantor which has been
                 delivered to Secured Party which would impair the ability of
                 Guarantor to pay and perform its obligations under the
                 Guaranty and (B) stating that no Default or Event of Default
                 shall have occurred and be continuing as of such date;

                          (ix)    a written opinion of counsel for Debtor and
                 Guarantor;

                          (x)     copies of the Bills of Sale;

                          (xi)    certificates of insurance evidencing the
                 coverages required hereunder;

                          (xii)   Uniform Commercial Code filings as deemed
                 appropriate by Secured Party's counsel duly executed by Debtor
                 and necessary third parties;

                          (xiii)  good standing certificates from the Secretary
                 of State of Debtor's state of incorporation and the state of
                 Debtor's chief executive office; and

                          (xiv)   good standing certificates from the Secretary
                 of State of Guarantor's state of incorporation and Guarantor's
                 chief executive office.

                          (xv)    UCC, tax and judgment lien searches as deemed
                 necessary or advisable by Secured Party;





                                       11
<PAGE>   12
                          (xvi)   the absence on the date hereof of any Liens
                 on the Collateral, other than any Permitted Encumbrance in
                 favor of Secured Party; and

                          (xvii)  Secured Party shall have received such other
                 documents, certificates, financing statements and other items,
                 in form and substance satisfactory to Secured Party, as
                 Secured Party may request.

                 (b)      Term Loan Advances after the Closing Date.  The
         obligation of the Secured Party to make Term Loan A advances and/or
         Term Loan B advances after the Closing Date is subject to satisfaction
         of the following conditions:

                          (i)     delivery to the Secured Party of a Notice of
                 Borrowing;

                          (ii)    no material adverse change in the condition
                 of the Debtor (financial or otherwise) shall have occurred
                 since the Closing Date;

                          (iii)   the absence on the date of such advance of
                 any Default or Event of Default; and

                          (iv)    no Lien or other interest shall have been
                 permitted to attach to the Collateral superior or subordinate
                 to the interest of the Secured Party under this Agreement,
                 except for Permitted Encumbrances.

                                   ARTICLE II

                               SECURITY INTEREST

         SECTION 2.1  GRANT OF SECURITY INTEREST.

         Debtor hereby Grants to Secured Party a first priority security
interest in the following (collectively, the items described in subsections
(a)-(d) may be referred to herein as the "Collateral"):

                 (a)      All right, title and interest of the Debtor in and to
         the Equipment as the same is now and will hereafter be constituted,
         whether now owned by the Debtor or hereafter acquired, together with
         all accessories, equipment, parts and appurtenances appertaining or
         attached to the Equipment whether now owned or hereafter acquired, and
         all substitutions, renewals and replacements of and additions,
         improvements, accessions and accumulations to the Equipment together
         with all the rents, issues, income, profits and avails thereof.

                 (b)      All right, title, interest, claims and demands of
         Debtor in, to and under the following (collectively the "Assigned
         Agreements"):

                          (i) the Bills of Sale;

                          (ii) the Permitted Leases; and

                          (iii)   any and all other contracts and agreements
                 (excluding this Agreement and any supplement or modification
                 thereto and the Notes) relating to the Equipment or any rights
                 or interests therein to which Debtor is now or may hereafter
                 be a party (excluding contracts or agreements by the Debtor
                 with vendors providing for the use of certain Equipment by
                 Debtor to record, produce and distribute seismic data),
                 together with all rights, powers, privileges, licenses,
                 easements, options and other benefits of Debtor under each
                 thereof, including without limitation the right to make all
                 waivers and agreements, to give and receive all notices and
                 other instruments





                                       12
<PAGE>   13
                 or communications, to take such action upon the occurrence of
                 a default thereunder, including the commencement, conduct and
                 consummation of legal, administrative or other Proceedings, as
                 shall be permitted thereby or by law, and to do any and all
                 other things which Debtor is or may be entitled to do
                 thereunder.

                 (c)      The proceeds from a sale or transfer of any right,
         title or interest of Debtor in the Equipment or any portion thereof.

                 (d)      All proceeds of any and all of the foregoing
         Collateral, whether now owned or hereafter acquired by Debtor and
         wherever located, including without limitation:

                          (i)     cash, accounts receivable, instruments,
                 contract rights, chattel paper, documents of title and any
                 other obligation due to Debtor with respect to or in
                 connection with the foregoing Collateral; and

                          (ii) to the extent not otherwise included, all
                 payments under any casualty insurance (whether or not Secured
                 Party is the loss payee thereof), condemnation award,
                 indemnity, warranty or guaranty, payable by reason of loss or
                 damage to or otherwise with respect to any of the foregoing
                 Collateral.

                 The Collateral shall mean and include all personal property
         and the proceeds of such personal property described in any and all
         amendments to this Agreement hereafter executed by Debtor and Secured
         Party in connection with the Loan.

         SECTION 2.2  SECURITY FOR SECURED OBLIGATIONS.

         This Agreement secures the payment of all indebtedness and other
obligations of Debtor to Secured Party with respect to: the Loans, whether now
or hereafter existing, including without limitation Debtor's obligations to
Secured Party under the Notes or any other instrument and all amendments
thereto and renewals and extensions thereof, whether for principal, interest,
fees, expenses or otherwise; all of Debtor's obligations of payment and
performance now or hereafter existing under this Agreement, including, without
limitation, all amendments hereto and renewals and extensions hereof (all such
obligations of Debtor described in this Section 2.2 being, collectively, the
"Secured Obligations").

         SECTION 2.3  SECURITY INTEREST ABSOLUTE.

         All rights of Secured Party and security interests hereunder and all
Secured Obligations shall be absolute and unconditional, irrespective of:

                 (i)      any lack of validity or enforceability of the Notes,
         this Agreement or any other Security Instrument or any other agreement
         or instrument relating thereto;

                 (ii)     any change in the time, manner, or place or payment
         of, or in any other term of, all or any of the Secured Obligations or
         any other amendment or waiver of or any consent to any departure from
         the Notes, this Agreement or any other Security Instrument; or

                 (iii)    any exchange, release or non-perfection of any other
         collateral, or any release, amendment or waiver of or consent to
         departure from any guaranty, for all or any of the Secured
         Obligations.





                                       13
<PAGE>   14
         SECTION 2.4  DEBTOR AS AGENT FOR SECURED PARTY.

         Title to each item of Equipment shall at all times remain in Debtor so
long as any Loans or other obligations under this Agreement remain outstanding;
provided, however, that with respect to each item of Equipment subject to motor
vehicle titling and registration laws, Secured Party appoints Debtor as the
agent of Secured Party and grants Debtor a limited power of attorney for the
sole and limited purpose of causing each item of such Equipment to be titled in
the name of Debtor with Secured Party noted as the first, and sole, lienholder.
Debtor shall keep possession of such original certificates of title and upon
reasonable notice Secured Party shall have the right to review such original
certificates of title during Debtor's normal business hours. In the case of a
Default or an Event of Default, Debtor shall promptly deliver within five (5)
Business Days the original certificates of title to Secured Party. The agency
and power of attorney created hereby shall immediately terminate upon the
occurrence of any Default or Event of Default under this Agreement.

                                  ARTICLE III

                   REPRESENTATIONS, WARRANTIES AND COVENANTS

         SECTION 3.1  DEBTOR'S REPRESENTATIONS AND WARRANTIES.

Debtor hereby represents and warrants to Secured Party that:

                 (a)      Debtor is a corporation duly organized and validly
         existing under the laws of the State of Delaware and has all requisite
         corporate power, authority and legal right to own its properties,
         including without limitation the Collateral, to conduct its business
         as is now being conducted and to execute, deliver and perform its
         obligations under the Notes, this Agreement, each other Security
         Instrument to which it is a party and each other document or agreement
         related to the Collateral to which it is a party. Debtor is fully
         qualified to do business and is in good standing in each jurisdiction
         in which the failure to be in good standing would have a material
         adverse effect on the business or operations of Debtor.

                 (b)      The execution, delivery and performance by Debtor of
         the Notes, this Agreement and each other Security Instrument to which
         it is a party are within Debtor's corporate powers, have been duly
         authorized by all requisite corporate action, do not contravene
         Debtor's charter or by-laws or any law, governmental rule or
         regulation, or any order, writ, injunction, decree, determination or
         award currently in effect applicable to, or any contractual
         restriction binding on or affecting, Debtor or any of its properties,
         including without limitation the Collateral, and do not result in or
         require the creation of any Lien, security interest, right of
         acceleration, charge or encumbrance (other than pursuant to this
         Agreement) upon or with respect to any of its properties.

                 (c)      No authorization or approval or other action by, and
         no notice to or filing (other than the filings referred to in
         subparagraph (f) below) with, any governmental authority or regulatory
         body, shareholders or any other Person is required for the due
         execution, delivery and performance by Debtor of this Agreement or any
         other Security Instrument to which it is a party.

                 (d)      The Notes, this Agreement and each other Security
         Instrument to which Debtor is a party are the legal, valid and binding
         obligations of Debtor, enforceable against Debtor in accordance with
         their respective terms, subject, in the case of enforceability, to
         applicable bankruptcy, insolvency, reorganization, moratorium and
         other laws affecting creditors' rights generally and to the
         application of general principles of equity (regardless of whether
         such enforceability is considered in a proceeding in equity or at
         law).

                 (e)      The proceeds of the Loans will be used only to
         finance the purchase by Debtor of the Equipment; Debtor owns good and
         marketable title to the Equipment; the Collateral is free and clear of
         all Liens (except for Permitted Encumbrances in favor of Secured
         Party); and the Equipment is in good





                                       14
<PAGE>   15
         condition and ready for operation. The Equipment is and will retain
         its character as personal property, and neither Debtor, Guarantor, or
         any Affiliate or Subsidiary of either Debtor or Guarantor shall affix
         or attach any item of Equipment in any manner so as to alter the
         character of the Equipment as personal property subject to the UCC.

                 (f)      Except for the notation on the certificates of title
         naming Secured Party as first lienholder with respect to all items of
         Equipment subject to motor vehicle titling and registration laws, the
         filing of Uniform Commercial Code financing statements in the office
         of the Secretary of State of the State of Texas will create a valid
         perfected first priority security interest in the Collateral, securing
         the payment of the Secured Obligations, and all filings and other
         actions necessary or desirable to perfect and protect such security
         interests will have been taken. No Person other than Secured Party
         holds any security interest affecting the Collateral. No effective
         Security Instrument or other instrument similar in effect covering all
         or any part of the Collateral is on file in any recording office,
         except such as may have been filed in favor of Secured Party relating
         to this Agreement.

                 (g)      Debtor's chief executive office is located in Harris
         County, Houston, Texas. The Debtor has not used any trade names or
         other names.

                 (h)       Contemporaneously with the execution and delivery of
         this Agreement, Debtor is delivering to Secured Party evidence of
         insurance satisfying the requirements of Section 4.1 hereof.

                 (i)      Debtor is not currently insolvent, as defined in 11
         U.S.C. 101(32) nor will it be rendered insolvent by virtue of entering
         into the Notes, this Agreement or any other Security Instrument to
         which it is a party or carrying out any of the transactions
         contemplated hereby or thereby.

                 (j)      Each financial statement of Guarantor which has been
         furnished to Secured Party fairly presents the financial condition of
         Guarantor as of the date of such financial statement. There has been
         no material adverse change in Guarantor's financial condition since
         the date of the most current financial statement delivered to Secured
         Party.

                 (k)      There is no pending, or to the Debtor's knowledge,
         threatened, action or Proceeding affecting Debtor, Guarantor or any of
         their properties before any court, governmental agency or arbitrator
         which may materially and adversely affect the condition (financial or
         otherwise) or operations of Debtor, Guarantor or any of their
         properties or which purports to affect the validity or enforceability
         of the Notes, this Agreement or any other Security Instrument to which
         Debtor is a party.

                 (l)      No Default or Event of Default has occurred and is
         continuing.

                 (m)      All sales, transfer, use, documentation or similar
         taxes, fees or other charges due and payable prior to or as of the
         date hereof have been paid to the extent such are in connection with
         the sale to and purchase by Debtor of the Equipment.

                 (n)      Debtor is not a party to, nor bound by, any contract,
         agreement or instrument that would conflict with this Agreement, the
         Notes or any other contracts, agreements or instruments executed in
         connection with the transactions contemplated by this Agreement.

                 (o)      Debtor has agreed, and hereby acknowledges, to accept
         service of process at its address set forth in Section 8.1 hereof in
         person or by registered or certified mail return receipt requested,
         postage prepaid, in connection with any Proceeding initiated by
         Secured Party in any of the courts referenced in Section 8.11 hereof.

                 (p)      The Debtor has no Subsidiaries.





                                       15
<PAGE>   16
                 (q)      Debtor has not incurred any accumulated unfunded
         deficiency within the meaning of the Employee Retirement Income
         Security Act of 1974, as amended from time to time ("ERISA") nor has
         Debtor incurred any material liability to the Pension Benefit Guaranty
         Corporation ("PBGC") established under such Act (or any successor
         thereto under such Act) in connection with any Plan. Debtor and its
         Affiliates are in compliance in all material respects with those
         provisions of ERISA and the regulations and public interpretations
         thereunder which are applicable to Debtor and its Affiliates, except
         for such noncompliance as would not have a material adverse effect on
         the financial condition of Debtor and its Affiliates, taken as a
         whole.

                 (r)      Debtor has filed all income tax returns required to
         be filed prior to the date hereof with the various governmental
         entities having taxing authority with respect to Debtor.

                 (s)      Debtor (i) is not an "investment company" as such
         term is defined in, or otherwise subject to regulations under, the
         Investment Company Act of 1940 and (ii) is not a Holding company" as
         that term is defined in, and is not otherwise subject to regulations
         under, the Public Utility Holding Company Act of 1935.

                 (t)      Debtor has not sold, extended any offer to sell nor
         accepted any offer to purchase regarding any of Debtor's interest in
         the Collateral or with respect to the transactions described in the
         Security instruments or the Notes.

                 (u)      Debtor has delivered true and accurate copies of the
         Bills of Sale executed by each Seller with respect to the transfer of
         the Equipment to Debtor.

         SECTION 3.2  AFFIRMATIVE COVENANTS.

         Until all the Secured Obligations shall have been fully paid and
satisfied, Debtor covenants and agrees that it shall, unless Secured Party
shall have otherwise consented in writing:

                 (a)      promptly pay the principal of, interest on, and any
         other amounts due under the Notes as and when the same become due,
         whether at maturity, by acceleration or otherwise;

                 (b)      (i) duly, punctually and faithfully perform its
         obligations under the Notes, this Agreement and each other Security
         Instrument to which it is a party; (ii) maintain the Liens and
         security interests created by this Agreement and each other Security
         Instrument to which it is a party as valid and perfected Liens on and
         security interests in all of the Collateral, prior in right to any
         other Lien, security interest, claim or other encumbrance; (iii)
         warrant and defend its interest in and to the Collateral against the
         claims and demands of all Persons; and (iv) defend, at Debtor's cost,
         any action, claim or Proceeding affecting the Collateral;

                 (c)      use the proceeds of the Loans only to finance the
         purchase by Debtor of the Equipment and maintain good and marketable
         title to the Equipment, free and clear of any Liens, security
         interests, charges or encumbrances except for the security interest
         created by this Agreement and Permitted Encumbrances;

                 (d)      notify Secured Party at least thirty (30) days prior
         to the changing of the chief executive office of the Debtor from the
         location specified in Section 3.1 (g);

                 (e)      at no expense to Secured Party, cause each item of
         Equipment to be serviced, maintained and preserved in the same
         condition, repair and working order as when new, ordinary wear and
         tear excepted, and in accordance with any manufacturer's suggested or
         approved maintenance program and warranty requirements, and shall, in
         the case of any loss or damage to any item of Equipment, promptly





                                       16
<PAGE>   17
         furnish to Secured Party a statement respecting any such loss or
         damage and (unless an Event of Loss shall have occurred with respect
         to an item of Equipment) as quickly as practicable after the
         occurrence thereof make or cause to be made all repairs, replacements
         and other improvements in connection therewith which are necessary or
         desirable to keep each item of Equipment in proper working order;

                 (f)      permit Secured Party to inspect the Equipment during
         normal business hours upon reasonable prior notice to Debtor;

                 (g)      from time to time execute and deliver all such
         supplements and amendments hereto and to any other Security
         Instrument, and all such financing statements, continuation
         statements, instruments of further assurance and other instruments,
         and take such other action, as the Secured Party requests and
         reasonably deems necessary or advisable to: (i) further Grant,
         maintain or preserve the Lien and security interest contemplated by
         this Agreement or carry out more effectively the purposes hereof; (ii)
         perfect or protect the validity of any Security Instrument or of any
         Grant made or to be made by this Agreement; or (iii) enforce any
         Security Instrument or preserve and defend title to the Collateral and
         the rights of the Secured Party therein against the claims of all
         Persons and parties;

                 (h)      comply with all of its representations, warranties
         and covenants set forth in this Agreement, in the Notes and each
         Security Instrument to which it is a party; and punctually perform and
         observe all of its obligations and agreements contained in this
         Agreement, in the Notes and each Security Instrument to which it is a
         party;

                 (i)      promptly notify the Secured Party of any default by
         any Person under any Security Instrument;

                 (j)      remain a duly organized and validly existing
         corporation under the laws of the state of its incorporation and
         remain duly qualified to do business and in good standing in each
         jurisdiction in which the failure to be in good standing would have a
         material adverse effect on the business or operations of Debtor;

                 (k)      comply in all material respects with all applicable
         laws, rules, regulations and orders; and preserve and maintain all
         federal, state and local licenses, privileges, franchises,
         certificates and other permits necessary for the operation of its
         business and the operation of each item of Equipment;

                 (l)      pay or cause to be paid promptly when due (i)
         (subject to the right of Debtor, in accordance with the provisions of
         this Agreement to obtain extensions of the date on which such taxes
         are due) all property and other taxes (including without limitation
         income, sales, use, franchise and gross receipts taxes) and
         governmental charges or levies which are at any time or from time to
         time levied upon or assessed against it or any item of Equipment or
         are otherwise associated with the ownership, use or operation of any
         item of Equipment (except such taxes levied on the net income of
         Secured Party) and (ii) all claims (including without limitation
         claims for labor, materials and supplies) against any item of
         Equipment; provided, that Debtor may contest any such tax or claim by
         appropriate Proceedings so long as such Proceedings shall suspend the
         collection thereof, no part of the Collateral would be subject to
         sale, forfeiture or diminution during the pendency of such
         Proceedings, Debtor shall have furnished such security as may be
         required in the Proceedings or reasonably requested by Secured Party,
         Debtor conducts such contests in good faith and with due diligence,
         and promptly after the final determination of each such contest,
         Debtor pays all amounts which shall be determined to be payable in
         respect thereof;

                 (m)      within 120 days after the end of each fiscal year
         furnish to the Secured Party unaudited year end financial reports of
         the Debtor including without limitation (i) a balance sheet and (ii)
         statements of income and retained earnings, all prepared in accordance
         with generally accepted accounting principles consistently applied and
         certified by the president, chief financial officer or any vice
         president of Debtor





                                       17
<PAGE>   18
         who prepared such financial statements as being true and accurate and
         fairly representing the financial condition of Debtor;

                 (n)      promptly report to Secured Party the commencement of
         any Proceeding against Debtor if such litigation reasonably would be
         expected to, in the event of an unfavorable outcome, cause an Event of
         Default, have a material adverse effect on Debtor's financial
         condition or operations, affect the validity or enforceability of the
         Notes, this Agreement or any of the Security Instruments or affect
         priority or enforceability of Secured Party's security interest in any
         of the Collateral;

                 (o)      promptly notify Secured Party in writing if a Default
         or an Event of Default has occurred;

                 (p)      upon the replacement of an item of Equipment with
         Replacement Equipment, Debtor, at its own expense, will promptly (i)
         cause a supplement hereto, in form and substance satisfactory to
         Secured Party, subjecting such Replacement Equipment to this
         Agreement, to be duly executed by Debtor, (ii) furnish Secured Party
         with such evidence of Debtor's title to such Replacement Equipment, of
         the condition of such Replacement Equipment, and of compliance with
         the insurance provisions hereof with respect to such Replacement
         Equipment and (iii) take such other action as Secured Party may
         request in order that such Replacement Equipment be duly and properly
         titled in Debtor and subject to this Agreement to the same extent as
         the item of Equipment replaced thereby;

                 (q)      (i) at all times, make prompt payment of all
         contributions required under its Plans and required to meet the
         minimum funding standard set forth in ERISA with respect to its Plans;
         (ii) notify Secured Party immediately of any fact, including, but not
         limited to, any Reportable Event (as defined in ERISA) arising in
         connection with any of its Plans, which might constitute grounds for
         termination thereof by the PBGC or for the appointment by the
         appropriate United States District Court of a trustee to administer
         such Plan, together with a statement, if requested by the Secured
         Party, as to the reason therefor and the action, if any, proposed to
         be taken with respect therefor; and (iii) furnish to Secured Party
         upon its request, such additional information concerning any of its
         Plans as may be reasonably requested;

                 (r)      Debtor shall pay, and save Secured Party harmless
         against, any and all losses, judgments, decrees and costs (including,
         without limitation, all reasonable attorneys' fees and expenses) in
         connection with any Permitted Contest and shall promptly after the
         final settlement, compromise or determination (including any appeals)
         of such contest, fully pay and discharge the amounts which shall be
         levied, assessed, charged or imposed or be determined to be payable
         therein or in connection therewith, together with all penalties,
         fines, interest, costs and expenses thereof or in connection
         therewith, and perform all acts, the performance of which shall be
         ordered or decreed as a result thereof.

         SECTION 3.3  NEGATIVE COVENANTS.

         Until the Secured Obligations shall have been fully paid and
satisfied, Debtor shall not, without the prior written consent of Secured
Party:

                 (a)      (i) sell, lease, assign, transfer, convey, Grant an
         interest in, exchange or otherwise dispose of any of the Collateral or
         any part thereof or (ii) cause or permit any subleasing of any of the
         Equipment (except that Debtor may lease any or all items of Equipment
         to a Permitted Lessee pursuant to a Permitted Lease);

                 (b)      create or suffer to exist any Lien affecting the
         Collateral or any part thereof, other than in favor of Secured Party
         or other Permitted Encumbrances;

                 (c)      use the Equipment for any unlawful purpose;





                                       18
<PAGE>   19
                 (d)      dissolve, wind up or liquidate or seek or permit the
         dissolution or liquidation of Debtor in whole or in part;

                 (e)      [intentionally omitted];

                 (f)      as against Secured Party, claim any credit on, or
         make any deduction from, the principal or interest payable on the
         Notes, whether by reason of the payment of any taxes levied or
         assessed upon any of the Collateral, or otherwise;

                 (g)      take or permit any action which would result in an
         Event of Default;

                 (h)      [intentionally omitted];

                 (i)      [intentionally omitted];

                 (j)      enter into any new line of business or operation not
         currently in existence with respect to the Debtor or materially alter
         its existing operations;

                 (k)      consolidate with or merge into any other corporation
         or sell, assign, convey, transfer or lease substantially all of its
         assets as an entirety to any Person unless:

                          (i)     Debtor is the surviving entity of any such
                 consolidation or merger; or

                          (ii)    (A) the corporation formed by such
                 consolidation or into which Debtor is merged, or the Person
                 which acquires by conveyance, transfer or lease of
                 substantially all of the assets of Debtor as an entirety,
                 shall be a solvent corporation organized and existing under
                 the laws of the United States or any state thereof or the
                 District of Columbia and shall execute and deliver to Secured
                 Party an agreement containing an effective assumption by such
                 successor, transferee or lessee corporation of the due and
                 punctual performance and observance of each covenant and
                 condition of this Agreement;

                                  (B)      immediately prior to and after
                          giving effect to such transaction, no Default or
                          Event of Default shall have occurred and be
                          continuing;

                                  (C)      Debtor shall have delivered to
                          Secured Party a certificate signed by an officer of
                          Debtor and an opinion of Debtor's counsel
                          satisfactory in form and substance to Secured Party
                          stating that such consolidation, merger, conveyance,
                          transfer or lease and the assumption agreement
                          mentioned in clause 3.3(k)(ii)(A) above comply with
                          the requirements of this Section 3.3(k) and that all
                          conditions precedent herein provided for relating to
                          such transaction have been complied with.

         Upon any consolidation or merger in which Debtor is not the surviving
corporation, or any conveyance, transfer or lease of substantially all the
assets of Debtor as an entirety in accordance with this Section 3.3(k), the
successor corporation formed by such consolidation or into which Debtor is
merged or to which such conveyance, transfer or lease is made (x) shall succeed
to, and be substituted for (but without release of Debtor from any of its
obligations hereunder) and (y) may exercise every right and power of, Debtor
under this Agreement with the same effect as if such successor corporation had
been named as a Debtor herein.

                 (l)      attach or affix any item of Equipment in any manner
         so as to alter the character of the Equipment as personal property
         subject to the UCC.





                                       19
<PAGE>   20
                                   ARTICLE IV

              INSURANCE, TRANSFER, CONDEMNATION AND EVENT OF LOSS

         SECTION 4.1  INSURANCE.

                 (a)      Property and Liability Insurance. So long as this
         Agreement is in effect, Debtor shall maintain and keep in force, or
         cause to be maintained and kept in force, without cost or expense to
         Secured Party, with respect to all items of Equipment prior to the
         expiration or earlier termination of this Agreement (i) all-risk
         property damage insurance in an amount not less than the aggregate
         Termination Value for all items of Equipment of such type as shall be
         satisfactory to Secured Party and (ii) commercial general liability
         insurance, including blanket contractual and personal injury
         insurance, covering any risks which Secured Party or Debtor might
         incur by reason of the use or operation of the Equipment in or over
         any area, in an amount not less than $6,000,000 per occurrence. Such
         insurance policy or policies referenced to in clause (i) of the
         preceding sentence will name Secured Party as a loss payee to the
         extent of its interest; provided, that upon verification by Secured
         Party that all amounts owing to Secured Party under the Agreement, the
         Notes or any other Security Instrument have been paid in full, then
         Secured Party shall remit all remaining property damage insurance
         proceeds, respecting any item of Equipment, to the extent such
         proceeds are controlled by Secured Party, to Debtor. Such insurance
         policy or policies referenced to in clause (ii) of the preceding
         sentence will name Secured Party as an additional insured. Each of the
         policies required by this Section 4.1 will provide that (A) the same
         may not be invalidated against Secured Party by reason of (1) any
         violation of a condition or breach of warranty of the policies or the
         application therefor by any Person excepting Secured Party, (2) the
         use of any item of Equipment for purposes not permitted by such
         policies by any Person excepting Secured Party, (3) any foreclosure
         proceeding or notice of sale regarding any item of Equipment or (4)
         the title or beneficial ownership of any item of Equipment being held
         by a party other than Debtor; (B) the policies may be canceled or
         materially amended by the insurer only after thirty (30) days' prior
         written notice to Secured Party; (C) the interests of Secured Party in
         such insurance policies (except with respect to commercial general
         liability) are assignable and (D) such insurance policies shall be
         primary insurance. Each of the policies required by this Section 4.1
         shall otherwise be reasonably satisfactory to Secured Party. The
         policies of insurance required under this Section shall be valid and
         enforceable policies issued by insurers of recognized responsibility
         acceptable to Secured Party. On or before the date hereof, and
         thereafter at intervals of not more than twelve months, Debtor will
         furnish or cause to be furnished to Secured Party a certificate or
         other evidence satisfactory to Secured Party signed by an independent
         insurance broker certifying to Secured Party's satisfaction that
         Debtor has insurance in place with respect to all items of Equipment
         which complies with the insurance requirements of this Agreement. If
         Debtor shall fait to cause the insurance required under this Section
         4.1 to be carried and maintained, Secured Party may, but shall have no
         obligation to, provide such insurance and Debtor shall reimburse
         Secured Party upon demand for the cost thereof as a supplemental
         payment hereunder in addition to other amounts owing with respect to
         the Notes or this Agreement.

         SECTION 4.2  TRANSFER OF COLLATERAL.

         Except as otherwise expressly provided by the provisions of this
Agreement, Debtor will not (prior to the satisfaction of all Obligations)
lease, Grant or otherwise transfer the Collateral or any part thereof or any
interest therein to any party other than Secured Party without Secured Party's
prior written consent and any and all such transfers shall be made under and
subject to Secured Party's security interest in such Collateral hereunder.
Prior to or simultaneously with any such transfer, the transferee shall accept,
agree to and execute an agreement assuming Debtor's Obligations to Secured
Party, in form and substance satisfactory to Secured Party.





                                       20
<PAGE>   21
         SECTION 4.3  CONDEMNATION.

         Immediately upon obtaining knowledge thereof, Debtor shall notify
Secured Party of any condemnation or other eminent domain Proceedings with
respect to any item of Equipment. Secured Party may participate in any such
Proceedings, and Debtor shall provide Secured Party with all instruments
required by it to permit such participation upon obtaining actual knowledge
thereof. Debtor shall pay all reasonable fees and expenses incurred by Secured
Party in connection with Secured Party's participation in any such Proceedings.
All proceeds arising from any such eminent domain Proceedings shall be paid to
and applied by the Secured Party as specified in Section 5.3 hereof.

         SECTION 4.4  CERTAIN EVENTS OF LOSS.

         Upon the occurrence of an Event of Loss with respect to any item of
Equipment, Debtor shall pay Secured Party within thirty (30) days after receipt
of insurance proceeds after the occurrence of such Event of Loss (but in no
event shall such period extend 120 days beyond the date of the occurrence of
such Event of Loss) or, if such day is not a Business Day, on the next
occurring Business Day (the "Event of Loss Payment Date") an amount equal to
the sum of (a) the Termination Value (computed as of the Installment Payment
Date immediately preceding the Event of Loss Payment Date) for the items of
Equipment then subject to the Event of Loss, plus (b) all accrued but unpaid
interest, plus (c) any Break-Funding Costs with respect to the items of
Equipment then subject to the Event of Loss, plus (d) all other obligations
owing hereunder on the Event of Loss Payment Date. Upon payment of the amounts
set forth in (a)-(d) above, Secured Party shall release its Lien on the items
of Equipment then subject to the Event of Loss.

                                   ARTICLE V

                         EVENTS OF DEFAULT AND REMEDIES

         SECTION 5.1  EVENTS OF DEFAULT.

         Any of the following occurrences or acts shall constitute an event of
default under this Agreement (individually, an "Event of Default"):

                 (a)      Debtor shall fail to pay any principal of, or
         interest on, the Notes or any other indebtedness of Debtor to Secured
         Party, now or hereafter existing, within five (5) Business Days from
         the date the same shall be due and payable, whether at maturity, by
         acceleration or otherwise; or

                 (b)      Except as specified in Section 5.1(a), Debtor shall
         default in the payment of any costs or expenses incurred by Secured
         Party in connection herewith or any other amounts hereunder or under
         the Notes within ten (10) Business Days from the date on which Secured
         Party notifies Debtor of such default; or

                 (c)      Debtor shall fail to observe the terms and covenants
         of Sections 3.2(b)(ii), 3.2(c), 3.2(l), 3.3(a)-(l) or 4.1; or

                 (d)      Except as otherwise specified in Sections 5.1
         (a)-(c), Debtor shall fail to perform or observe any other term,
         covenant or agreement contained in the Notes, this Agreement or any
         other Security Instrument and such failure shall remain unremedied for
         a period of thirty (30) days from either the date Debtor first knows
         of such failure or the date on which Secured Party notifies Debtor of
         such failure; or

                 (e)      Any representation or warranty made by Debtor in the
         Notes, this Agreement, any other Security Instrument or in any
         certificate or other document delivered pursuant hereto or thereto
         shall prove to have been incorrect or misleading in any material
         respect when made; or





                                       21
<PAGE>   22
                 (f)      Debtor shall admit in writing its inability to pay
         its debts, or shall make a general assignment for the benefit of
         creditors; or any Proceeding shall be instituted by or against Debtor
         seeking to adjudicate it bankrupt or insolvent, or seeking
         reorganization, liquidation, arrangement, adjustment or composition of
         it or its debt under any law relating to bankruptcy, insolvency or
         reorganization or relief of debtors, or seeking appointment of a
         receiver, custodian, trustee, or other similar official for it or for
         any substantial part of its property, and, in the case of any such
         Proceeding instituted against Debtor, it shall remain undismissed for
         a period of sixty (60) days; or Debtor shall take any action to
         authorize any of the actions set forth in this subsection (f); or

                 (g)      This Agreement shall, for any reason, except to the
         extent permitted by the terms hereof, cease to create a valid first
         priority Lien on and perfected first priority security interest in any
         of the Collateral purported to be covered hereby; or

                 (h)      Any provision of the Notes, this Agreement or the
         other Security Instruments shall cease to be valid and binding on
         Debtor, as a signatory thereto, or Debtor shall so state in writing;
         or Secured Party shall be deprived of any of the benefits of the Note,
         this Agreement or any other Security Instrument for any reason
         whatsoever; or

                 (i)      For any reason whatsoever, Debtor is not entitled to
         or does not possess the property rights or other rights regarding the
         Collateral which have been assigned or transferred to Secured Party;
         or

                 (j)      Debtor shall dissolve or any action shall be taken by
         Debtor to wind up or liquidate Debtor's business, affairs or property
         or assets or Debtor shall announce its intention to do so without
         Secured Party's prior written consent; or

                 (k)      Any sale, transfer, conveyance, abandonment,
         condemnation, partition or change in ownership of any item or items of
         Equipment in excess of $50,000, or any portion thereof shall occur,
         whether in one transaction or a series of transactions without Secured
         Party's prior written consent; or

                 (l)      An attachment or other Lien shall be filed or levied
         against a substantial part of the property of Debtor (or any Affiliate
         of Debtor) and such judgment shall continue unstayed and in effect, or
         such attachment or Lien shall continue undischarged or unbended, for a
         period of sixty (60) days; or

                 (m)      Guarantor shall fail to make a payment under the
         Guaranty within five (5) Business Days from the date such payment is
         due; or

                 (n)      Except as specified in Section 5.1 (m), Guarantor
         shall fail to perform or observe any other term, covenant or agreement
         contained in the Guaranty and such failure shall remain unremedied for
         a period of thirty (30) days from either the date Guarantor first
         knows of such failure or the date on which Secured Party notifies
         Guarantor of such failure; or

                 (o)      Any representation or warranty made by Guarantor in
         the Guaranty or in any certificate or other document delivered
         pursuant thereto shall prove to have been incorrect or misleading in
         any material respect when made; or

                 (p)      Guarantor shall admit in writing its inability to pay
         its debts, or shall make a general assignment for the benefit of
         creditors; or any Proceeding shall be instituted by or against
         Guarantor seeking to adjudicate it bankrupt or insolvent, or seeking
         reorganization, liquidation, arrangement, adjustment or composition of
         its finances or debt under any law relating to bankruptcy, insolvency
         or reorganization or relief of debtors, or seeking appointment of a
         receiver, custodian, trustee, or other similar official for its
         finances or for any substantial part of its property, and, in the case
         of any such Proceeding instituted against





                                       22
<PAGE>   23
         Guarantor, it shall remain undismissed for a period of sixty (60)
         days; or Guarantor shall take any action to authorize any of the
         actions set forth in this subsection (p); or

                 (q)      Guarantor (or any Affiliate of Guarantor) shall be in
         default (i) under any lease, loan agreement or other agreement,
         instrument or document respecting any such obligation of Guarantor (or
         any Affiliate of Guarantor) in excess of $10,000,000, now or hereafter
         entered into between Guarantor (or any Affiliate of Guarantor) and
         Secured Party, or between Guarantor (or any Affiliate of Guarantor)
         and any parent, subsidiary or affiliate of Secured Party, and such
         default shall have been declared by the party entitled to declare the
         same, (ii) under any promissory note, now or hereafter executed by
         Guarantor (or any Affiliate of Guarantor) and delivered to any party
         referred to in clause (i) above evidencing a loan made by any such
         party to Guarantor (or any Affiliate of Guarantor) or (iii) in the
         payment of any single amount due by Guarantor (or any Affiliate of
         Guarantor) to any Person (other than Secured Party, or any parent,
         subsidiary or affiliate of Secured Party) in excess of $10,000,000
         (excluding any such obligation which is being contested in good faith
         by Guarantor (or any Affiliate of Guarantor) by appropriate
         proceedings, and the liability for which has not been reduced to
         judgment) relating to the payment of borrowed money or the payment of
         rent or hire under any lease agreement and such default shall have
         continued for more than thirty (30) days after the date Guarantor (or
         any Affiliate of Guarantor) obtained knowledge or received notice
         thereof; or an attachment or other Lien shall be filed or levied
         against a substantial part of the property of Guarantor or Debtor and
         such judgment shall continue unstayed and in effect, or such
         attachment or Lien shall continue undischarged or unbended, for a
         period of sixty (60) days; or

                 (r)      Any provision of the Guaranty shall cease to be valid
         and binding on Guarantor, as a signatory thereto, or Guarantor shall
         so state in writing; or Secured Party shall be deprived of any of the
         benefits of the Guaranty for any reason whatsoever; or

                 (s)      Any action shall be taken by Guarantor to wind up or
         liquidate Guarantor's business, affairs or property or assets or
         Guarantor shall announce his intention to do so without Secured
         Party's prior written consent.

         SECTION 5.2  REMEDIES.

         If any Event of Default shall have occurred and be continuing:

                 (a)      the Secured Party may do one or more of the
         following:

                          (i)     declare the Notes and all interest thereon
                 and all other Secured Obligations to be forthwith due and
                 payable, whereupon the Notes, all such interest and all
                 Secured Obligations shall become and be forthwith due and
                 payable, without presentation, demand, protest or further
                 notice of any kind, all of which are hereby expressly waived
                 by Debtor;

                          (ii)    exercise, in respect of the Collateral, in
                 addition to other rights and remedies provided for herein or
                 otherwise available to it, all the rights and remedies of a
                 secured party on default under the UCC and/or other applicable
                 law and also (A) require Debtor to, and Debtor hereby agrees
                 that it will at its expense and upon the request of Secured
                 Party forthwith, assemble all or part of the Collateral as
                 directed by Secured Party and make it available to Secured
                 Party at a place to be designated by Secured Party and (B)
                 without notice except as specified below, sell the Collateral
                 or any part thereof in one or more parcels at public or
                 private sale, at any of Secured Party's offices or elsewhere,
                 for cash, on credit or for future delivery, and upon such
                 other terms as Secured Party may deem commercially reasonable.
                 Debtor agrees that, to the extent notice of sale shall be
                 required by law, at least fifteen (15) days' notice to Debtor
                 of the time and place of any public sale or the time after
                 which any private sale is to be made shall constitute
                 reasonable notification. Secured Party shall not be obligated
                 to make any sale of Collateral regardless of notice





                                       23
<PAGE>   24
                 of sale having been given. Secured Party may adjourn any
                 public or private sale from time to time by announcement at
                 the time and place fixed therefor, and such sale may, without
                 further notice, be made at the time and place to which it was
                 so adjourned;

                          (iii)   to the extent permitted by applicable law,
                 bring suit at law, in equity or through other appropriate
                 Proceedings, whether for the specific performance of any
                 covenant or agreement contained in this Agreement or any of
                 the other Security Instruments, for an injunction against a
                 violation of any of the terms hereof or thereof, in aid of the
                 exercise of any power Granted hereby or thereby, or by law, to
                 recover judgment for any and all amounts due on the Notes,
                 this Agreement, any of the other Security Instruments or
                 otherwise, including, without limitation, any deficiency
                 remaining after foreclosure hereunder;

                          (iv)    exclude Debtor from the Collateral and take
                 immediate possession of interest therein, and, at the expense
                 of Debtor, maintain, repair, alter, use, add to, improve,
                 insure, lease, operate and manage the Collateral in such
                 manner as Secured Party shall see fit; and

                          (v)     take any other appropriate action to protect
                 and enforce the rights and remedies of Secured Party
                 hereunder, or under or in respect of any other Security
                 Instrument, or otherwise.

                 (b)      Notwithstanding any provision to the contrary
         contained in this Agreement, the Notes or any other Security
         Instrument, the unpaid principal amount of the Notes and all accrued
         interest and other sums payable under the Notes or under this
         Agreement shall be forthwith payable upon a sale of any portion of the
         Collateral pursuant to subsection (a)(ii) of this Section 5.2. All
         earnings, revenues, proceeds, rents, issues, profits and income
         derived pursuant to subsection (a)(iv) of this Section 5.2 (after
         deducting costs and expenses of operation and other proper charges),
         all proceeds of any such sale and ail other money and property
         received or recovered by the Secured Party pursuant to this Section
         5.2 shall be held and applied as set forth in Section 5.3 hereof.

                 (c)      The power to effect any sale under this Section 5.2
         shall not be exhausted by any one or more sales as to any portion of
         the Collateral remaining unsold, but shall continue unimpaired until
         all of the Collateral shall have been sold or all of the Secured
         Obligations shall have been paid in full.

                 (d)      Secured Party may bid for and acquire any portion of
         the Collateral in connection with a sale thereof under this Section
         5.2, and may pay all or part of the purchase price by crediting
         against amounts owing on the Secured Obligations, all or part of the
         net proceeds of such sale after deducting the costs, charges and
         expenses incurred by Secured Party in connection with such sale. The
         Notes need not be produced in order to complete any such sale or
         effect such credit. Secured Party may hold, lease, operate, manage or
         otherwise deal with any property so acquired in any manner permitted
         by law.

                 (e)      Secured Party shall execute and deliver an
         appropriate instrument of conveyance transferring its interest in any
         portion of the Collateral in connection with a sale thereof under this
         Section 5.2. In addition, Debtor hereby irrevocably appoints Secured
         Party as its agent and attorney-in-fact to transfer and convey its
         interest in any portion of the Collateral in connection with such a
         sale thereof and to take all action necessary to effect such sale. No
         purchaser or transferee at such a sale shall be bound to ascertain
         Secured Party's authority, inquire into the satisfaction of any
         condition precedent or see to the application of any monies.

                 (f)      Secured Party's right to seek and recover judgment on
         the Secured Obligations shall not be affected by the seeking,
         obtaining or application of any other relief under or with respect to
         this Agreement.  Neither the Lien of this Agreement nor any rights or
         remedies of Secured Party shall be impaired by the recovery of any
         judgment by Secured Party against Debtor or by the levy of an
         execution under such judgment upon any portion of the Collateral.





                                       24
<PAGE>   25
                 (g)      All rights and remedies from time to time conferred
         upon or reserved to the Secured Party are cumulative, and none is
         intended to be exclusive of another and shall be in addition to every
         other right or remedy permitted by law. No delay or omission in
         insisting upon the strict observance or performance of any provision
         of this Agreement, or in exercising any right or remedy, shall be
         construed as a waiver or relinquishment of such provision, nor shall
         it impair such right or remedy. Every right and remedy may be
         exercised from time to time and as often as deemed expedient in any
         combination and order desired by Secured Party; provided, however,
         that Secured Party shall exercise none of the remedies referenced in
         this Section 5.2 with respect to the Collateral unless and until an
         Event of Default shall have occurred and be continuing.

                 (h)      Anything contained in this Agreement to the contrary
         notwithstanding, until an Event of Default shall occur and be
         continuing: (i) all rights, powers, privileges and other benefits of
         or accruing to Debtor under the Assigned Agreements shall be
         exercisable only by Debtor, without the consent or approval of the
         Secured Party, (ii) Debtor shall retain full right to make all waivers
         and agreements, to give and receive all notices and other instruments
         or communications, and to take all action upon the occurrence of a
         default under any Assigned Agreement, including the commencement,
         conduct and consummation of legal, administrative or other
         proceedings, as shall be permitted thereby or by law, and to do any
         and all other things which Debtor is or may be entitled to do under
         any Assigned Agreement.

         SECTION 5.3  PROCEEDS OF COLLATERAL.

         All cash proceeds received by Secured Party in respect of any sale of,
collection from, or other realization upon all or any part of the Collateral
shall be held by Secured Party as collateral for, and then promptly thereafter
applied by Secured Party against, all or any part of the amounts due under the
Notes and the other Secured Obligations in such order as Secured Party shall
elect. Any surplus of such cash or cash proceeds held by Secured Party and
remaining after payment in full of all the Secured Obligations shall be paid
over to Debtor or to whomsoever may be lawfully entitled to receive such
surplus.

         SECTION 5.4  WAIVER OF RIGHTS; RECEIVER.

                 (a)      Debtor consents to the appointment of one or more
         receivers of all or part of the Collateral, upon the request of
         Secured Party, if an Event of Default shall have occurred and be
         continuing.

                 (b)      To the extent permitted by law, Debtor hereby waives
         its right to seek, and hereby agrees that it will not seek or derive
         any benefit or advantage from, any of the following whether now
         existing or hereafter in effect:

                          (i)     any stay, extension, moratorium or similar
                 law with respect to the Collateral or the Secured Obligations;

                          (ii)    any law allowing for the redemption of any
                 portion of the Collateral after a sale thereof under Section
                 5.2 hereof; and

                          (iii)   any right to have any portion of the
                 Collateral after an Event of Default shall have occurred.

         Debtor covenants not to hinder, delay or impede the exercise of any
         right or remedy of Secured Party under or in respect of this Agreement
         and agrees to suffer and permit the exercise of each such remedy.





                                       25
<PAGE>   26
                                   ARTICLE VI

                             INDEMNITY AND EXPENSES

         SECTION 6.1  GENERAL INDEMNITY.

         Debtor hereby assumes liability for, and does hereby agree, whether or
not any of the transactions contemplated hereby, by the Security Instruments or
the Notes are consummated, to indemnify, protect, save, defend and hold
harmless Secured Party and each of its officers, directors, stockholders,
successors, assigns, agents and servants (for purposes of this Article VI, each
of the foregoing may be referred to individually as a "Beneficiary") from and
against any and all obligations, fees, liabilities, losses, damages, penalties,
claims, demands, actions, suits, judgments, costs and expenses, including,
without limitation, reasonable legal fees and expenses, of every kind and
nature whatsoever imposed on, incurred by, or asserted against any Beneficiary,
in any way relating to or arising out of (a) the manufacture, construction,
ordering, purchase, acceptance or rejection, financing, ownership, titling or
retitling, registration or re-registration, acceptance, leasing, subleasing,
possession, use, operation, maintenance, storage, removal, sale, delivery or
other disposition of any item of Equipment, including, without limitation, any
of such as may arise from (i) loss or damage to any property or death or injury
to any person, (ii) patent or latent defects in any item of Equipment (whether
or not discoverable by Debtor or any Beneficiary), (iii) any claims based on
strict liability in tort or otherwise, (iv) any claims based on patent,
trademark or copyright infringement and (v) any claims based on liability
arising under the applicable environmental or noise or pollution control law or
regulation or (b) any failure on the part of Debtor to perform or comply with
any of the terms of the Security instruments or the Notes or (c) any Security
Instrument or the Notes. Debtor shall not be required to indemnify any
Beneficiary for any claims resulting from acts which would constitute the
willful misconduct or gross negligence of such Beneficiary. Debtor shall give
Secured Party prompt notice of any occurrence, event or condition known to
Debtor as a consequence of which any Beneficiary is or is reasonably likely to
be entitled to indemnification hereunder. Debtor shall promptly upon demand of
any such Beneficiary reimburse such Beneficiary for amounts expended by it in
connection with any of the foregoing or pay such amounts directly. Debtor shall
be subrogated to a Beneficiary's rights in any matter with respect to which
Debtor has actually reimbursed such Beneficiary for amounts expended by it or
has actually paid such amounts directly pursuant to this Section 6.1. In case
any action, suit or Proceeding is brought against any Beneficiary in connection
with any claim indemnified against hereunder, such Beneficiary will, after
receipt of notice of the commencement of such action, suit or Proceeding,
notify Debtor thereof, enclosing a copy of all papers served upon such
Beneficiary. Debtor may, and upon any Beneficiary's request will, at Debtor's
expense, resist and defend such action, suit or Proceeding, or cause the same
to be resisted or defended by counsel selected by Debtor and reasonably
satisfactory to such Beneficiary and in the event of any failure by Debtor to
do so, Debtor shall pay ail costs, fees and expenses (including, without
limitation, reasonable attorney's fees and expenses) incurred by such
Beneficiary in connection with such action, suit or Proceeding.

         SECTION 6.2  GENERAL TAX INDEMNITY.

         Debtor agrees to pay, and indemnify and hold each Beneficiary harmless
on an after-tax basis from, any and all federal, state, local and foreign
taxes, fees, withholdings, levies, imposts, duties, assessments and charges of
any kind and nature whatsoever, together with any penalties, fines or interest
therein (herein called "Taxes or Other Impositions") howsoever imposed, whether
levied or imposed upon or asserted against such Beneficiary, Debtor, any item
of Equipment or any part thereof, by any federal, state or local government or
taxing authority in the United States, or by any taxing authority or
governmental subdivision of a foreign country, upon or with respect to (a) any
item of Equipment (b) the manufacture, construction, ordering, purchase,
ownership, financing, delivery, leasing, releasing, possession, use,
maintenance, registration, titling, licensing, documentation, return, sale
(including, without limitation, sale to a third party) or other application or
disposition thereof, (c) the payments, receipts or earnings arising from any
item of Equipment or (d) the Bills of Sale, the Security Instruments or the
Notes, or upon the payments by Debtor under the Bills of Sale, the Notes or the
Security Instruments; provided, however, that the foregoing indemnity shall not
apply to any taxes or other impositions to the extent based upon or measured by
any Beneficiary's net income (unless such tax or other imposition is a Covered
Income Tax as hereinafter defined), and





                                       26
<PAGE>   27
which are imposed or levied by any federal, state or local taxing authority in
the United States. For purposes hereof, a "Covered Income Tax" shall mean an
income tax (including, without limitation, a tax imposed upon gross income or
receipts) imposed on any Beneficiary by any taxing authority (excluding the
United States federal government) in whose jurisdiction such Beneficiary
(including for this purpose all entities with which it is combined, integrated
or consolidated in such taxing authority's jurisdiction) would not engage in
business, would not maintain an office or other place of business and would not
otherwise be located therein, but for such Beneficiary's role in the
transaction associated with the financing of the Equipment, the operation of
the Equipment in such jurisdiction, the presence of Debtor or any use of the
Equipment or the transactions contemplated by the Bills of Sale, the Security
Instruments or the Notes.

         Each Beneficiary shall furnish Debtor with copies of any requests for
information received by such Beneficiary from any taxing authority relating to
any taxes or other impositions with respect to which Debtor is required to
indemnify hereunder, and if a claim is made against such Beneficiary for any
such taxes or other impositions, with respect to which Debtor is liable for a
payment or indemnity hereunder, such Beneficiary shall give Debtor notice in
writing within (10) Business Days of such Beneficiary's receipt of such claim.
Debtor may, at its sole cost and expense, either in its own name or in the name
of any Beneficiary, contest the validity, applicability or amount of any such
tax or other imposition by means of a Permitted Contest. If any Beneficiary
shall obtain a refund of any amount paid by Debtor pursuant to this Section
6.2, such Beneficiary shall pay to Debtor the amount of such refund, together
with the amount of any interest actually received by such Beneficiary on
account of such refund. Debtor will promptly notify Secured Party of all
reports or returns required to be made with respect to any tax or other
imposition with respect to which Debtor is required to indemnify hereunder and
will promptly provide each Beneficiary with all information necessary for the
making and timely filing of such reports or returns by such Beneficiary. If any
Beneficiary requests that any such reports or returns be prepared and filed by
Debtor, Debtor will prepare and file the same if permitted by applicable law to
do so, and if not so permitted, Debtor shall prepare such reports or returns
for signature by such Beneficiary, and shall forward the same, together with
immediately available funds for payment of any tax or other imposition due, to
such Beneficiary, at least ten (10) Business Days in advance of the date such
payment is to be made.  Upon written request, Debtor shall furnish each
Beneficiary with copies of all paid receipts or other appropriate evidence of
payment for all taxes or other impositions paid by Debtor pursuant to this
Section 6.2.

                                  ARTICLE VII

                FURTHER ASSURANCES; ATTORNEY-IN-FACT; DISCHARGE

         SECTION 7.1  FURTHER ASSURANCES.

                 (a)      Debtor agrees that from time to time, at the expense
         of Debtor, Debtor will promptly execute and deliver all further
         instruments and documents, and take all further action that Secured
         Party may reasonably deem necessary or desirable, or that Secured
         Party may otherwise reasonably request, in order to perfect and
         protect any security interest Granted or purported to be Granted
         hereby or to enable Secured Party to exercise and enforce its rights
         and remedies hereunder with respect to any Collateral. Without
         limiting the generality of the foregoing, Debtor will cooperate to
         execute and file financing or continuation statements, or amendments
         hereto or thereto, and such other instruments or notices, as may be
         necessary or reasonably desirable, or as Secured Party may reasonably
         request, in order to perfect and preserve the security interests
         Granted or purported to be Granted hereby.

                 (b)      A carbon, photographic or other reproduction of this
         Agreement or any financing statement covering the Collateral or any
         part thereof shall be sufficient as a financing statement where
         permitted by law.





                                       27
<PAGE>   28
                 (c)      Debtor will furnish to Secured Party from time to
         time statements and schedules further identifying and describing the
         Collateral and such other reports in connection with the Collateral as
         Secured Party may reasonably request, all in reasonable detail.

         SECTION 7.2  SECURED PARTY APPOINTED ATTORNEY-IN-FACT.

         Debtor hereby irrevocably appoints Secured Party to serve as Debtor's
attorney-in-fact (provided, the parties hereto agree that Secured Party may not
act as Debtor's attorney-in-fact until the occurrence and during the
continuation of an Event of Default), with full authority in the place and
stead of Debtor and in the name of Debtor, Secured Party or otherwise, from
time to time in Secured Party's discretion, to take any action and to execute
any instrument, including without limitation financing statements or amendments
thereto, which Secured Party may deem necessary or advisable to accomplish the
purposes of this Agreement, including without limitation:

                 (a)      to obtain and adjust insurance required to be paid to
         Secured Party hereunder;

                 (b)      to ask, demand, collect, sue for, recover, compound,
         receive and give acquittance and receipts for monies due and to become
         due under or in respect of any of the Collateral;

                 (c)      to receive, endorse, and collect any drafts or other
         instruments, documents and chattel paper, in connection with
         subsections (a) or (b) above; and

                 (d)      to file any claims or take any action or institute
         any Proceedings which Secured Party may deem necessary or desirable
         for the collection of any of the Collateral or otherwise to enforce
         the rights of Secured Party with respect to any of the Collateral.

         SECTION 7.3  SECURED PARTY MAY PERFORM.

         If Debtor fails to perform any agreement contained herein, Secured
Party may itself perform, or cause performance of, such agreement, and the
expenses of Secured Party incurred in connection therewith shall be payable by
Debtor under Section 6.1.

         SECTION 7.4  SECURED PARTY'S DUTIES.

         The powers conferred on Secured Party hereunder are solely to protect
its interest in the Collateral and shall not impose any duty upon it to
exercise any such powers. Secured Party shall have no duty as to any Collateral
or as to the taking of any necessary steps to preserve rights against other
parties or any other rights pertaining to any Collateral.

         SECTION 7.5  CONTINUING SECURITY INTEREST; TRANSFER OF NOTE;
TERMINATION.

         This Agreement shall: (a) create a continuing security interest in the
Collateral and shall remain in full force and effect until payment in full of
the Secured Obligations, be binding upon Debtor, its successors and assigns and
(b) inure to the benefit of Secured Party and its permitted successors,
transferees and assigns. Without limiting the generality of the foregoing
clause, Secured Party may assign or otherwise transfer all or any part of
Secured Party's interest in the Notes and/or the Security Instruments to one or
more persons or entities, and such other persons or entities shall thereupon
become vested with all the benefits in respect thereof Granted to Secured Party
herein. Upon the payment in full of the Secured Obligations, the security
interest Granted hereby shall terminate and all rights to the Collateral shall
revert to Debtor. Upon any such termination, Secured Party will execute and
deliver to Debtor such documents as Debtor shall reasonably request to evidence
such termination.





                                       28
<PAGE>   29
                                  ARTICLE VIII

                                 MISCELLANEOUS

         SECTION 8.1  NOTICES.

         Except as expressly permitted herein to the contrary, all notices and
other communications provided for hereunder shall be in writing (including
communication by telecopier) and mailed (postage prepaid, by registered or
certified mail, return receipt requested), telecopied or hand delivered:

if to Secured Party, at:

                                  NationsBanc Leasing Corporation of
                                    North Carolina
                                  101 South Tryon Street, NC1-002-38-20
                                  Charlotte, North Carolina  28255
                                  Attention:  Manager of Corporate Lease
                                              Administration
                                  Telecopy:  (704) 386-0892

or if to Debtor, at:

                                  Eagle Geophysical, Inc.
                                  50 Briar Hollow Lane, 7th Floor-West
                                  Houston, Texas 77027
                                  Attention: Debra D. Valice
                                  Telecopy: (713) 627-1114

or, as to each party, at such other address as shall be designated by such
party in a written notice to the other party.  All such notices and
communications shall be effective (a) five (5) days after such have been
deposited in the mail or (b) immediately (i) after such have been telecopied to
the appropriate telecopy number and (ii) after such have been hand delivered to
the appropriate address.

         SECTION 8.2  RISK OF LOSS.

         Debtor shall bear all risk of any loss of or damage to the Collateral
and in no event shall Secured Party be liable for such loss or damage.

         SECTION 8.3  POWERS AND AGENCIES.

         Whenever in this Agreement Secured Party or Debtor is Granted the
power of attorney or is appointed the agent and attorney-in-fact with respect
to any Person, such Grant or appointment is irrevocable and coupled with an
interest.  Secured Party shall have full power of substitution and delegation
in respect of all such Grants and appointment.

         SECTION 8.4  ENTIRE AGREEMENT.

         The Notes, this Agreement and the other Security Instruments embody
the entire agreement between the parties and supersede all prior agreements and
understandings, if any, relating to the subject matter hereof.





                                       29
<PAGE>   30
         SECTION 8.5  LAWFUL INTEREST.

         No provision in the Notes, this Agreement or any Security Instrument
or other document in favor of Secured Party shall require or permit the
collection of interest in excess of the maximum lawful rate which Debtor may
contract for, stipulate or agree to pay as determined by a court of competent
jurisdiction over the holder of the Notes or any such document. In determining
whether or not the interest paid or payable under any specific contingency
exceeds such maximum lawful rate, Debtor and Secured Party shall, to the full
extent permitted by applicable law, prorate, allocate and spread, in equal
parts, the total amount of interest throughout the entire contemplated term of
the Notes or other document, as the case may be, so that the interest rate is
uniform throughout the entire term of the Notes or such document. If it is so
determined that any interest in excess of such maximum lawful rate is provided
for, such excess shall be applied first to any other amounts not constituting
interest due or which may become due and payable to Debtor under the Notes or
any of such other documents, and the balance, if any, shall be refunded to
Debtor; provided, however, that in no event shall Debtor be obligated to pay,
and Secured Party hereby waives payment of, the amount of interest to the
extent it is in excess of the amount permitted by applicable law.

         SECTION 8.6  SURVIVAL; SEVERABILITY.

         If any word, phrase, sentence, paragraph, provision or section of this
Agreement, the Notes or any other Security Instrument shall be held, declared
or pronounced void, voidable, invalid, unenforceable or inoperative for any
reason by any court of competent jurisdiction, governmental authority or
otherwise, such holding, declaration or pronouncement shall not adversely
affect any other word, phrase, sentence, paragraph, provision or section of
this Agreement, the Notes or any other Security Instrument, which shall
otherwise remain in full force and effect and be enforced in accordance with
their respective terms, and the effect of such holding, declaration or
pronouncement shall be limited to the territory or the jurisdiction in which
made. All agreements, covenants, representations, warranties and conditions
contained in this Agreement or made pursuant to the provisions hereof shall
survive the execution and delivery of this Agreement until the Secured
Obligations shall have been paid and performed in full. All statements by
Debtor contained in any certificate or other instrument delivered pursuant to
the provisions of this Agreement or any other Security Instrument shall
constitute the representations and warranties of Debtor.

         SECTION 8.7  BINDING EFFECT.

         This Agreement shall be binding upon and inure to the benefit of
Debtor and Secured Party and their respective successors and assigns, except
that Debtor shall not have the right to assign its rights hereunder of any
interest herein without the prior written consent of Secured Party. Secured
Party may assign all or any part of, or any interest in, its rights and
benefits hereunder, under the Notes and any Security Instrument as permitted
under Section 7.5 hereof, and to the extent of such permitted assignment each
such assignee shall have the same rights and benefits against Debtor as it
would have had if it were Secured Party hereunder.

         SECTION 8.8  AMENDMENT AND WAIVER.

         No amendment or waiver of any provision of the Notes, this Agreement
or any of the other Security Instruments, or consent to any departure by Debtor
therefrom, shall in any event be effective unless the same shall be in writing
and signed by Secured Party and Debtor, and such waiver and consent shall be
effective only in the specific instance and for the specific purpose for which
given. No failure on the part of Secured Party to exercise, and no delay in
exercising, any right under the Notes, this Agreement or any of the other
Security Instruments shall operate as a waiver thereof; nor shall any single or
partial exercise of any right under any such instrument or agreement preclude
any other or further exercise thereof or the exercise of any other right.





                                       30
<PAGE>   31
         SECTION 8.9  HEADINGS; EXECUTION IN COUNTERPART.

         The section and article headings herein are for convenience of
reference only, and shall not limit or otherwise affect the meaning of any
provision herein. This Agreement may be executed in counterparts, each of which
shall constitute an original, but all of which together shall constitute one
and the same Agreement.

         SECTION 8.10  TRANSACTION COSTS.

         Debtor shall pay all reasonable costs and out-of-pocket expenses of
Secured Party incurred in connection with preparation, negotiation, execution,
modification and/or enforcement of the Notes, this Agreement, the other
Security Instruments including without limitation (a) the reasonable legal fees
and expenses of Moore & Van Allen, PLLC, (b) all filing and registration costs,
(c) all fees and disbursements incurred by Secured Party in connection with the
custody, preservation, use or operation of, or the sale of, collection from, or
other realization upon, any of the Collateral, and (d) all fees and
disbursements incurred by Secured Party in connection with the failure by
Debtor to perform or observe any of the provisions hereof.

         SECTION 8.11  APPLICABLE LAW; CONSENT TO JURISDICTION AND VENUE;
WAIVER OF JURY TRIAL.

         THIS AGREEMENT, THE NOTES AND THE OTHER SECURITY INSTRUMENTS AND ALL
MATTERS RELATING THERETO SHALL, EXCEPT TO THE EXTENT OTHERWISE REQUIRED BY
APPLICABLE LAW, BE GOVERNED BY AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH
THE LAWS OF THE STATE OF NORTH CAROLINA WITHOUT REGARD TO CONFLICT OF LAWS
PRINCIPLES. DEBTOR HEREBY SUBMITS TO THE JURISDICTION AND VENUE OF THE STATE
AND FEDERAL COURTS OF MECKLENBURG COUNTY, NORTH CAROLINA AND AGREES THAT
SECURED PARTY MAY, AT ITS OPTION, ENFORCE ITS RIGHTS HEREUNDER AND UNDER THE
NOTES AND OTHER SECURITY INSTRUMENTS IN SUCH COURTS. DEBTOR HEREBY IRREVOCABLY
WAIVES THE DEFENSE OF AN INCONVENIENT FORUM TO MAINTENANCE OF ANY ACTION OR
PROCEEDING BY SECURED PARTY IN SUCH COURTS. DEBTOR HEREBY IRREVOCABLY WAIVES,
TO THE EXTENT PERMITTED BY APPLICABLE LAW, ALL RIGHT TO TRIAL BY JURY IN ANY
ACTION, PROCEEDING OR COUNTERCLAIM ARISING OUT OF OR RELATING TO THIS
AGREEMENT, THE NOTES OR ANY OTHER SECURITY INSTRUMENT OR ANY OF THE
TRANSACTIONS CONTEMPLATED HEREBY OR THEREBY.

         SECTION 8.12  BREAK-FUNDING COSTS.

         Upon any early termination of this Agreement and/or any early
prepayment of the Notes for any reason which is not expressly permitted under
the Notes, Debtor shall promptly pay Secured Party (in addition to all other
amounts due and owing hereunder) an amount equal to the Break-Funding Costs
incurred by Secured Party, as such are (a) determined by Secured Party at such
time in its reasonable discretion and (b) specified in writing to Debtor.

         SECTION 8.13  INTENTION OF THE PARTIES.

         It is the intention of the parties to this Agreement that the
Equipment be and remain personal property, and at no time (so long as any of
the Secured Obligations remain outstanding) shall such Equipment be attached,
affixed or otherwise become a part of any vehicle or vessel. Further, each of
the parties hereto agree that it is their intent that the provisions of the UCC
govern the creation and perfection of a security interest in the Collateral.

        [The remainder of this page has been intentionally left blank.]





                                       31
<PAGE>   32
         IN WITNESS WHEREOF, Debtor and Secured Party have caused this
Agreement to be executed by their respective officers thereunto duly authorized
as of the date first above written.

                                           EAGLE GEOPHYSICAL, INC., as Debtor

                                           By:     /s/ Debra D. Valice
                                           Name:   Debra D. Valice
                                           Title:  Vice President

                                           NATIONSBANC LEASING CORPORATION OF
                                           NORTH CAROLINA, as Secured Party

                                           By:     /s/ George L. Robinson, Jr.
                                           Name:   George L. Robinson, Jr.
                                           Title:  Senior Vice President





                                       32
<PAGE>   33
                                SCHEDULE 1.3(a)

                              SECURED TERM NOTE A
                             DUE FEBRUARY 29, 2000

$557,768.14                                                    February 6, 1997

         FOR VALUE RECEIVED, the undersigned EAGLE GEOPHYSICAL, INC., a
Delaware corporation (-Debtor") HEREBY PROMISES TO PAY to the order of
NATIONSBANC LEASING CORPORATION OF NORTH CAROLINA, a North Carolina corporation
("Secured Party"), the principal sum of FIVE HUNDRED FIFTY-SEVEN THOUSAND SEVEN
HUNDRED SIXTY-EIGHT AND 14/100 DOLLARS ($557,768.14) (the "Original Amount")
pursuant to the terms and conditions of that certain Loan and Security
Agreement dated as of the date hereof between the Debtor and the Secured Party,
as amended, modified or replaced from time to time (as so amended, modified or
replaced, the "Agreement" - all the terms, conditions, definitions and
covenants of such Agreement are expressly made a part hereof in the same manner
and with the same effect as if set forth herein at length, any holder of this
Secured Term Note A (the "Note") being entitled to the benefits and remedies
provided for in the Agreement).

         The Bank has made a term loan to the Borrower as provided in Section
1.3(a) of the Loan Agreement. The outstanding principal balance hereof shall be
due and payable as provided in Section 1.3(a)(ii) of the Agreement.
Notwithstanding the foregoing, the final payment made on this Note shall be an
amount sufficient to discharge in full the unpaid Original Amount and all
accrued and unpaid interest on, and any other amounts due under this Note and
under the Agreement.

         This Note shall bear interest on the outstanding balance hereof, and
such interest shall be payable hereunder, as provided in Section 1.3(a)(ii) of
the Agreement.

         In the event the amounts owing under this Note shall be accelerated in
accordance with the terms of the Agreement, the amounts owing hereunder shall
become immediately due and payable without presentation, demand, protest or
notice of any kind, all of which are hereby expressly waived. Further, in the
event amounts owing hereunder are not paid when due (including any stated or
accelerated maturity), the Debtor agrees to pay promptly upon demand, in
addition to principal, interest and other amounts owing hereunder, all costs of
collection, including reasonable attorneys' fees.

         All payments shall be payable, in lawful money of the United States
and in immediately available funds without setoff or counterclaim, to Secured
Party at its office at NationsBank Plaza, 101 South Tryon Street,
NC1-002-38-20, Charlotte, North Carolina 28255 or such other address as the
holder thereof shall notify Debtor in writing.

         In determining whether or not the interest paid or payable, under any
specific contingency, exceeds the maximum lawful rate permitted by law, Debtor
and Secured Party shall, to the full extent permitted by applicable law,
exclude voluntary prepayment and the effects thereof and amortize, prorate,
allocate and spread, in equal parts, the total amount of interest throughout
the entire contemplated term of this Note so that the interest rate is uniform
throughout the entire term of this Note.  If it is so determined that any
interest in excess of such maximum lawful rate is provided for, then such
excess shall be applied first to any other amounts not constituting interest
due or which may become due under this Note or the Agreement and the balance,
if any, shall be refunded to Debtor; provided, however, that in no event shall
Debtor be obligated to pay, and Secured Party hereby waives payment of, the
amount of interest to the extent it is in excess of the amount permitted by
applicable law. No provision in this Note or the Agreement shall require or
permit the collection of interest in excess of the maximum lawful rate.





                                       1
<PAGE>   34
         This Note may be prepaid by the Debtor in accordance with Section
1.3(c) of the Agreement only if all amounts owing with respect to this Note,
Agreement and the other Security Instruments are paid in full. Except as
otherwise provided for herein and in the Agreement, this Note shall not be
subject to prepayment.

         THIS NOTE, THE AGREEMENT AND THE SECURITY INSTRUMENTS AND ALL MATTERS
RELATING THERETO SHALL, EXCEPT TO THE EXTENT OTHERWISE REQUIRED BY APPLICABLE
LAW, BE GOVERNED BY AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH THE LAWS
OF THE STATE OF NORTH CAROLINA WITHOUT REGARD TO CONFLICT OF LAWS PRINCIPLES.
DEBTOR HEREBY SUBMITS TO THE JURISDICTION AND VENUE OF THE STATE AND FEDERAL
COURTS OF NORTH CAROLINA AND AGREES THAT THE SECURED PARTY MAY, AT ITS OPTION,
ENFORCE ITS RIGHTS HEREUNDER AND UNDER THE AGREEMENT AND THE OTHER SECURITY
INSTRUMENTS IN SUCH COURTS. DEBTOR HEREBY IRREVOCABLY WAIVES THE DEFENSE OF AN
INCONVENIENT FORUM TO MAINTENANCE OF ANY ACTION OR PROCEEDING BY SECURED PARTY
IN SUCH COURTS. DEBTOR HEREBY IRREVOCABLY WAIVES ALL RIGHT TO TRIAL BY JURY IN
ANY ACTION, PROCEEDING OR COUNTERCLAIM ARISING OUT OF OR RELATING TO THIS NOTE,
THE AGREEMENT OR ANY OTHER SECURITY INSTRUMENT OR ANY OF THE TRANSACTIONS
CONTEMPLATED HEREBY OR THEREBY.

         IN WITNESS WHEREOF, the Debtor has caused this Note to be executed as
of the date appearing above.

                                        EAGLE GEOPHYSICAL, INC.

                                        By:
                                           -----------------------------------

                                        Name (Printed):
                                                       -----------------------

                                        Title:
                                              --------------------------------




                                       2
<PAGE>   35
                                SCHEDULE 1.3(b)

                              SECURED TERM NOTE B
                               DUE APRIL 30, 2002

$7,006,152.04                                                   February 6, 1997

         FOR VALUE RECEIVED, the undersigned EAGLE GEOPHYSICAL, INC., a
Delaware corporation ("Debtor") HEREBY PROMISES TO PAY to the order of
NATIONSBANC LEASING CORPORATION OF NORTH CAROLINA, a North Carolina corporation
("Secured Party"), the principal sum of SEVEN MILLION SIX THOUSAND ONE HUNDRED
FIFTY-TWO AND 04/100 DOLLARS ($7,006,152.04) (the "Original Amount") pursuant
to the terms and conditions of that certain Loan and Security Agreement dated
as of the date hereof between the Debtor and the Secured Party, as amended,
modified or replaced from time to time (as so amended, modified or replaced,
the "Agreement" - all the terms, conditions, definitions and covenants of such
Agreement are expressly made a part hereof in the same manner and with the same
effect as if set forth herein at length, any holder of this Secured Term Note B
(the "Note") being entitled to the benefits and remedies provided for in the
Agreement).

         The Bank has made a term loan to the Borrower as provided in Section
1.3(b) of the Loan Agreement. The outstanding principal balance hereof shall be
due and payable as provided in Section 1.3(b)(ii) of the Agreement.
Notwithstanding the foregoing, the final payment made on this Note shall be an
amount sufficient to discharge in full the unpaid Original Amount and all
accrued and unpaid interest on, and any other amounts due under this Note and
under the Agreement.

         This Note shall bear interest on the outstanding balance hereof, and
such interest shall be payable hereunder, as provided in Section 1.3(b)(ii) of
the Agreement.

         In the event the amounts owing under this Note shall be accelerated in
accordance with the terms of the Agreement, the amounts owing hereunder shall
become immediately due and payable without presentation, demand, protest or
notice of any kind, all of which are hereby expressly waived. Further, in the
event amounts owing hereunder are not paid when due (including any stated or
accelerated maturity), the Debtor agrees to pay promptly upon demand, in
addition to principal, interest and other amounts owing hereunder, all costs of
collection, including reasonable attorneys' fees.

         All payments shall be payable, in lawful money of the United States
and in immediately available funds without setoff or counterclaim, to Secured
Party at its office at NationsBank Plaza, 101 South Tryon Street,
NC1-002-38-20, Charlotte, North Carolina 28255 or such other address as the
holder thereof shall notify Debtor in writing.

         In determining whether or not the interest paid or payable, under any
specific contingency, exceeds the maximum lawful rate permitted by law, Debtor
and Secured Party shall, to the full extent permitted by applicable law,
exclude voluntary prepayment and the effects thereof and amortize, prorate,
allocate and spread, in equal parts, the total amount of interest throughout
the entire contemplated term of this Note so that the interest rate is uniform
throughout the entire term of this Note. If it is so determined that any
interest in excess of such maximum lawful rate is provided for, then such
excess shall be applied first to any other amounts not constituting interest
due or which may become due under this Note or the Agreement and the balance,
if any, shall be refunded to Debtor; provided, however, that in no event shall
Debtor be obligated to pay, and Secured Party hereby waives payment of, the
amount of interest to the extent it is in excess of the amount permitted by
applicable law. No provision in this Note or the Agreement shall require or
permit the collection of interest in excess of the maximum lawful rate.

         This Note may be prepaid by the Debtor in accordance with Section
1.3(c) of the Agreement only if ail amounts owing with respect to this Note,
the Agreement and the other Security Instruments are paid in full. Except as
otherwise provided for herein and in the Agreement, this Note shall not be
subject to prepayment.





                                       1
<PAGE>   36
         THIS NOTE, THE AGREEMENT AND THE SECURITY INSTRUMENTS AND ALL MATTERS
RELATING THERETO SHALL, EXCEPT TO THE EXTENT OTHERWISE REQUIRED BY APPLICABLE
LAW, BE GOVERNED BY AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH THE LAWS
OF THE STATE OF NORTH CAROLINA WITHOUT REGARD TO CONFLICT OF LAWS PRINCIPLES.
DEBTOR HEREBY SUBMITS TO THE JURISDICTION AND VENUE OF THE STATE AND FEDERAL
COURTS OF NORTH CAROLINA AND AGREES THAT THE SECURED PARTY MAY, AT ITS OPTION,
ENFORCE ITS RIGHTS HEREUNDER AND UNDER THE AGREEMENT AND THE OTHER SECURITY
INSTRUMENTS IN SUCH COURTS. DEBTOR HEREBY IRREVOCABLY WAIVES THE DEFENSE OF AN
INCONVENIENT FORUM TO MAINTENANCE OF ANY ACTION OR PROCEEDING BY SECURED PARTY
IN SUCH COURTS. DEBTOR HEREBY IRREVOCABLY WAIVES ALL RIGHT TO TRIAL BY JURY IN
ANY ACTION, PROCEEDING OR COUNTERCLAIM ARISING OUT OF OR RELATING TO THIS NOTE,
THE AGREEMENT OR ANY OTHER SECURITY INSTRUMENT OR ANY OF THE TRANSACTIONS
CONTEMPLATED HEREBY OR THEREBY.

        IN WITNESS WHEREOF, the Debtor has caused this Note to be executed as 
of the date

                                        EAGLE GEOPHYSICAL, INC.


                                        By:
                                           -----------------------------------

                                        Name (Printed):
                                                       -----------------------

                                        Title:
                                              --------------------------------




                                       2

<PAGE>   1
                                                                    EXHIBIT 10.3
                                                                      CSA 960930



                           CONDITIONAL SALES AGREEMENT

         THIS CONDITIONAL SALES AGREEMENT (the "Agreement") is made and entered
into by and between INPUT/OUTPUT, INC.  ("I/O"), a Delaware corporation having
offices at 11104 West Airport, Stafford, Texas 77477, and HORIZON EXPLORATION,
LTD. ("Purchaser"), having offices at 6 Pembroker Rd., Sevenoaks, Kent, TN13
1XR England.

         1.      Sale of Equipment.  I/O hereby agrees to sell and Purchaser
hereby agrees to purchase from I/O the goods and equipment described in
attached Schedule A (the "Equipment").

         2.      Sales Price.  The sales price for the Equipment is US
$3,354,825 (the "Sales Price").

         3.      Terms of Payment.  Purchaser agrees to pay the Sales Price to
I/O as follows:

                 (a)      Down Payment.  Purchaser shall make a cash down
payment of the Sales Price in the amount of $100,000 on or before August 30,
1996 and a cash down payment of $235,483 which is due and payable on or before
March 1, 1997.

                 (c)      Payment of Principal and Interest.  The remaining
unpaid balance of the Sales Price in the amount of US $3,019,342 is payable in
thirty (30) monthly installments, including principal and interest in strict
accordance with the amortization schedule attached hereto as Schedule B and
forming part of this Agreement.

                 (e)      Prepayments.  Purchaser may prepay the unpaid
principal balance, in whole or in part, without penalty.  All prepayments shall
be applied to the unpaid principal balance of the Sales Price in the inverse
order of maturity.

         4.      Title and Insurance.  Title to the Equipment shall not pass to
Purchaser, but shall remain with I/O, until Purchaser has paid the Sales Price
in full, all interest accrued thereon and all other amounts due hereunder.
Upon payment of the Sales Price in full, I/O shall deliver to Purchaser an
unconditional bill of sale for the Equipment.  Purchaser shall keep and
maintain insurance on the Equipment against loss, damage, destruction or fire
in an amount not less than the outstanding balance of the Sales Price with an
insurance company or companies acceptable to I/O.  All such policies of
insurance shall name I/O or its assignee as loss payee and named insured and
Purchaser shall provide certificates of insurance to evidence such coverage.

         5.      Default and Remedies.

                 (a)      If Purchaser fails or neglects to comply with any
term or condition of this Agreement, or to make any payment provided for
herein, when due or payable, or violates any of the provisions hereof, or if
the Purchaser becomes insolvent or bankrupt or if the Purchaser makes any
material misrepresentation (hereinafter collectively and individually referred
to as a "default"), and Purchaser has not cured such event of default after 10
days written notice by I/O, I/O, at its option, may declare the entire amount
owing hereunder to I/O immediately due and payable.
<PAGE>   2
                                                                      CSA 960930

                 (b)      In the event of default by Purchaser hereunder I/O
may, without notice to Purchaser, declare all of Purchaser's rights with
respect to the Equipment under this Agreement terminated, and exercise any and
all remedies, legal or equitable that it may have against Purchaser under
applicable law, including, but not limited to, without demand first made, and
with or without legal process, immediately take possession of the Equipment,
together with all additions, equipment and accessories thereto, wherever the
same may be found, using reasonable force if necessary, and hold the same,
together with title thereto, and Purchaser hereby waives all claims for damages
due to or arising from, or connected with any such taking.

                 (c)      If I/O takes possession of the Equipment, all of
Purchaser's rights with respect to the equipment under this Agreement shall
immediately terminate, and all payments theretofore made by Purchaser shall
belong absolutely to I/O, or its assignee.  I/O and its assignee shall be
entitled to apply all such payments, as well as amounts otherwise received in
subsequent sale of the Equipment, first to the payment of all its reasonable
expenses, including attorney's fees and legal expenses, incurred in taking
possession of the Equipment, or any part thereof, for sale or other
disposition, in arranging for any such sale or other disposition, and in
actually selling same, and next toward payment of the balance due hereunder, in
such order and manner as I/O or its assignee, as applicable, may deem
advisable.  I/O shall remit to Purchaser any net surplus received from a sale
of the Equipment after payment in full of the Sales Price, accrued interest and
all costs of repossession and sale.  If such payments and such sales proceeds
are not sufficient to pay the amounts due hereunder, the Purchaser shall remain
fully liable for any deficiency.

                 (d)      In addition to any other obligation of Purchaser or
remedy of I/O herein or at law, Purchaser shall reimburse I/O for all of I/O's
expenses, including legal expenses, which I/O may incur in enforcing the rights
under this Agreement.

                 (e)      Notwithstanding anything contained herein to the
contrary, in the event the Purchaser fails to pay any monies owing hereunder,
such past due amounts shall bear interest at the rate of 1-1/2% per month.

         6.      Confidentiality.  The terms and conditions of this Agreement
are confidential in nature and I/O and Purchaser agree that said terms will not
be disclosed to anyone outside of I/O's and Purchaser's respective
organizations.

         7.      Taxes.  All sales, value added, use, excise and other taxes
arising from the transaction are to be paid by Purchaser.  Purchaser agrees to
indemnify and hold I/O harmless from and against any liability for such sales,
use, excise, or other taxes arising from the transaction.

         8.      Limited Warranty.  I/O hereby agrees to provide a limited
warranty on Equipment covered under this Agreement as per attached Schedule C.

         9.      Arbitration.  In the event Purchaser is an entity formed,
incorporated or existing outside of the United States of America, I/O and
Purchaser agree that any controversy arising between the Parties shall be
submitted to arbitration using the Rules of Conciliation and





                                       2
<PAGE>   3
                                                                      CSA 960930

Arbitration of the International Chamber of Commerce.  In the event Purchaser
is an entity formed, incorporated or existing within the United States of
America, I/O and Purchaser agree that this sale shall not be subject to
arbitration.

         10.     Export Restrictions.  Purchaser agrees that it shall comply
with any and all laws, regulations, orders, or other restrictions of the United
States of America relating to the export and re-export of commodities and
technical data which may be imposed from time to time.  Purchaser will not
export or re-export, directly or indirectly any Products or information to any
destination prohibited by such laws, regulations, orders or other restrictions
without the prior authorization of the appropriate U.S. Government authorities.
Purchaser agrees that its obligations under this section shall survive and
continue after any termination of rights under this Sales Agreement.

         11.     Unanticipated Advice.  If, in the course of completing work
required under this agreement, Purchaser personnel should solicit advice or
information from I/O's personnel not covered by this Agreement, and then
subsequently choose to act upon this advice or information, the Purchaser
agrees to indemnify and hold I/O harmless from any and all subsequent
occurrences arising from the advice or information.

         12.     Location of Equipment.  Purchaser agrees to use the Equipment
offshore within the territorial boundaries of North West Europe until the Sales
Price is paid in full, unless I/O otherwise agreed in writing.  Purchaser
agrees to provide written notice to I/O, on the first day of each month during
which any portion of the Sales Price remains unpaid, stating the location of
the Equipment and shall from time to time, upon twenty-four hours prior notice,
advise I/O in writing of the exact location of the equipment.

         13.     Proprietary Rights, License and Confidentiality.

                 (a)      Purchaser acknowledges that the Equipment contains
certain hardware components and software proprietary to I/O.  I/O hereby grants
to Purchaser a non-exclusive, irrevocable license to use the software for the
purpose of operating the Equipment.  The license granted hereunder is for an
undetermined period and shall survive the termination of this Agreement
provided such termination does not arise from a default by Purchaser under this
Agreement.

                 (b)      Purchaser acknowledges that any hardware and software
proprietary to I/O are trade secrets and constitute a valuable asset of I/O.
Purchaser agrees that it shall exercise at least the same degree of care and
discretion with respect to the hardware and software as it exercises in
protecting its own confidential information; that it shall not disclose or
otherwise make available, without the prior written consent of I/O, the
hardware or software or any copies of it to any other person and that it shall
not copy or reproduce the hardware or software.  Purchaser agrees that this
provision shall survive the expiration or termination of this Agreement.

                 (c)      Purchaser further acknowledges that it shall not,
without the prior written consent of I/O, divulge any information relating to
the terms of this Agreement to any third party, except as to the extent
required by law, and shall take all reasonable action to prevent its employees
and all others, if any, involved in this Agreement from divulging such
information to





                                       3
<PAGE>   4
                                                                      CSA 960930

third parties.  This obligation shall remain in force after the expiration or
termination of this Agreement.

         14.     Other Conditions:

                 (a)      Mandatory Prepayment.  The unpaid principal balance
and accrued unpaid interest on the Sales Price shall be due and payable in full
on or before the expiration of ten (10) days following a "Corporate Change."  A
"Corporate Change" shall mean any of the following:  (A) Purchaser sells or
otherwise disposes of all or substantially all of its assets or (B) Purchaser
issues or sells shares of its common stock (other than issuance of stock to
employees or directors as part of any employee benefit plan) and receives
proceeds from such sale of stock in an amount that is equal to $20 million or
greater.

                 (b)      Vessel Owner Waivers.  Purchaser shall at all times
provide I/O with Vessel Owner Waivers from vessel contractors for all vessels
on which the Equipment is located.

         15.     General.

                 (a)      This Agreement shall be construed in accordance with
the laws of the State of Texas.  All sales of goods or services hereunder will
be F.O.B. I/O's plant in Stafford, Texas, if any of the Equipment is being
shipped by I/O, and shall be deemed to have been delivered and accepted upon
execution with respect to all Equipment which is currently in possession of
Purchaser pursuant to rental agreements with I/O or another party.  All terms
and conditions of this sale, including all payments, are due, performable and
payable in Stafford, Fort Bend County, Texas.  This writing is intended by the
parties as a final expression of their agreement and the parties agree that
there are no understandings, agreements or representations, expressed or
implied, not specified herein, respecting the sale, and that this writing
contains the entire agreement between I/O and Purchaser.

                 (b)      Any action or proceeding relating to or concerning
this Agreement or any breach thereof must be commenced within one (1) year
after the asserted claim or cause of action shall have occurred (whether or not
the party asserting such claim or cause of action had any knowledge or notice
thereof, and, if no action or proceeding is commenced within such one (1) year
period, the party in whose favor the claim or cause of action arises shall be
deemed to have waived the same).

                 (c)      The invalidity in whole or in part of any of the
foregoing provisions will not affect the remainder of such provisions.
Purchaser warrants it is not a consumer and is a Merchant in the type of
equipment sole hereunder and that the goods or services represented by this
sale are purchased for commercial purposes.  If allowed by applicable law,
Purchaser agrees to hold I/O harmless and agrees to indemnify I/O from all
damages resulting from suits under the Texas Deceptive Trade Practices Act
insofar as they include recovery for damages in excess of those allowed
hereunder and the Uniform Commercial Code as adopted by the State of Texas.
Purchaser hereby waives the right to all remedies provided by the Deceptive
Trade Practices/Consumer Protection Act of the Texas Business & Commerce Code,
in accordance with Section 17.42 of the Business & Commerce Code.





                                       4
<PAGE>   5
                                                                      CSA 960930


         16.     Notice Between Parties.  Any notice or delivery to be given
hereunder by either party to the other may be effected by personal delivery in
writing, certified mail, postage prepaid, mailgram or telegram, and shall be
deemed communicated as of delivery, unless otherwise provided in this Agreement
in accordance with this paragraph.

to the Purchaser at:

         HORIZON EXPLORATION, LTD.
         6 Pembroke Rd.
         Sevenoaks, Kent TN13 1XR
         England
         Attention:  Gerry Harrison
         Fax:  44-1732-742-746

to the Seller at:

         INPUT/OUTPUT, INC.
         11104 West Airport
         Stafford, TX 77477
         Attention:  Robert P. Brindley
         Fax:  713-879-3632

         17.     Usury Laws.  Any provision in this agreement or any other
document executed or delivered in connection herewith, or in any other
agreement or commitment, whether written or oral, expressed or implied, to the
contrary notwithstanding, neither I/O nor any holder or assignee hereof shall
in any event be entitled to receive or collect, nor shall or may amounts
received hereunder be credited, so that I/O or any other holder hereof shall be
paid, as interest, a sum greater than the maximum amount permitted by
applicable law to be charged to the person, partnership, firm or corporation
primarily obligated to pay under this Agreement at the time in question.  If
any construction of this Agreement or any document securing this Agreement, or
any and all other papers, agreements or commitments, indicate a different right
given to I/O or any holder hereof to ask for, demand or receive any larger sum
as interest, such is a mistake in calculation or wording which this clause
shall override and control, it being the intention of the parties that this
Agreement, and all other instruments securing the payment of this Agreement or
executed or delivered in connection herewith shall in all things comply with
applicable law and proper adjustments shall automatically be made accordingly.
In the event that I/O or any holder ever receives, collects or applies as
interest, any sum in excess of the maximum rate allowed by law, if any, such
excess amount shall be applied to the reduction of the unpaid principal balance
of this Agreement, and if this Agreement is paid in full, any remaining excess
shall be paid to Purchaser.  In determining whether or not the interest paid or
payable, under any specific contingency, exceeds the maximum rate allowable by
law, if any, Purchaser and I/O or any holder hereof shall, to the maximum
extent permitted under applicable law, (a) exclude voluntary prepayments and
the effects thereof, or (b) "spread" the total amount of interest throughout
the entire term of this Agreement so that the interest rate is uniform
throughout the entire term of this Agreement; provided, that if this Agreement
is paid and performed in full prior to the end of the full contemplated term
hereof, and if the interest received for the actual period of existence





                                       5
<PAGE>   6
                                                                      CSA 960930

thereof exceeds the maximum lawful rate, if any, I/O or any holder hereof shall
refund to Purchaser the amount of such excess or credit the amount of such
excess against the aggregate unpaid principal balance of all advances made by
the I/O or any holder under this Agreement at the time in question.

         18.     Entire Agreement.  This Agreement constitutes the entire
agreement between I/O and Purchaser with respect to the purchase and sale of
the Equipment and no representation or statement not contained herein shall be
binding upon I/O or Purchaser as a warranty or otherwise, unless in writing and
executed by the party to be bound thereby.  This Agreement shall be binding
upon and inure to the benefit of the parties hereto and their respective
successors and assigns.  Purchaser acknowledges that it has read this
Agreement, understands it, and agrees to all terms and conditions stated
herein.

HORIZON EXPLORATION, LTD.                  INPUT/OUTPUT, INC.


By: /s/  G. M. Harrison                    By: /s/  Robert P. Brindley

Name:    G.M. Harrison                     Name:    Robert P. Brindley

Title:   Managing Director                 Title:  Senior Vice President,
                                                   Chief Financial Officer 
Date:    10th February 1997                        and Secretary

                                           Date:   2/19/97

I/O hereby assigns to Global Charter Corporation all of its right, title and
interest in and to the Sales Price and any interest payable with respect
thereto under this Agreement.





                                       6
<PAGE>   7
                                                                      CSA 960930

GLOBAL CHARTER CORPORATION




By:  /s/ Robert P. Brindley

Name:    Robert P. Brindley

Title:   Chief Executive Officer

Date:    2/19/97





                                       7
<PAGE>   8
                               INPUT/OUTPUT INC.


CSA Number:      960930
Customer:        HORIZON EXPLORATION INC
Schedule A

<TABLE>
<CAPTION>
PART NUMBER          SERIAL NUMBER                DESCRIPTION
<S>                      <C>                     <C>
1441200001               218134                  SLIP-RING ELEC/OPTIC W/JNC BOX
                                            
1441200001               218137                  SLIP-RING ELEC/OPTIC W/JNC BOX
                                            
1441200001               218146                  SLIP-RING ELEC/OPTIC W/JNC BOX
                                            
21037803                 No Serial #             KIT, SHIPBOARD SPARES, MSX
                                            
21289300                 60001                   MODULE STREAMER, WG-24A
                                            
21289300                 60002                   MODULE STREAMER, WG-24A
                                            
21289300                 60004                   MODULE STREAMER, WG-24A
                                            
21289300                 60005                   MODULE STREAMER, WG-24A
                                            
21289300                 60006                   MODULE STREAMER, WG-24A
                                            
21289300                 60007                   MODULE STREAMER, WG-24A
                                            
21289300                 60009                   MODULE STREAMER, WG-24A
                                            
21289300                 60012                   MODULE STREAMER, WG-24A
                                            
21289300                 60013                   MODULE STREAMER, WG-24A
                                            
21289300                 60014                   MODULE STREAMER, WG-24A
                                            
21289300                 60015                   MODULE STREAMER, WG-24A
                                            
21289300                 60017                   MODULE STREAMER, WG-24A
                                            
21289300                 60018                   MODULE STREAMER, WG-24A
                                            
21289300                 60019                   MODULE STREAMER, WG-24A
                                            
21289300                 60021                   MODULE STREAMER, WG-24A
                                            
21289300                 60022                   MODULE STREAMER, WG-24A
                                            
21289300                 60023                   MODULE STREAMER, WG-24A
                                            
21289300                 60024                   MODULE STREAMER, WG-24A
                                            
21289300                 60025                   MODULE STREAMER, WG-24A
                                            
21289300                 60031                   MODULE STREAMER, WG-24A
                                            
21289300                 60032                   MODULE STREAMER, WG-24A
                                            
21289300                 60033                   MODULE STREAMER, WG-24A
                                            
21289300                 60035                   MODULE STREAMER, WG-24A
                                            
21289300                 60036                   MODULE STREAMER, WG-24A
                                            
21289300                 60037                   MODULE STREAMER, WG-24A
                                            
21289300                 60038                   MODULE STREAMER, WG-24A
              
</TABLE>      
              
              


                                    Page: 1
<PAGE>   9
                               INPUT/OUTPUT INC.


CSA Number:      960930
Customer:        HORIZON EXPLORATION INC
Schedule A

<TABLE>
<CAPTION>                            
PART NUMBER         SERIAL NUMBER                DESCRIPTION
<S>                     <C>                      <C>
21289300                60039                    MODULE STREAMER, WG-24A
                                     
21289300                60040                    MODULE STREAMER, WG-24A
                                     
21289300                60041                    MODULE STREAMER, WG-24A
                                     
21289300                60043                    MODULE STREAMER, WG-24A
                                     
21289300                60045                    MODULE STREAMER, WG-24A
                                     
21289300                60046                    MODULE STREAMER, WG-24A
                                     
21289300                60048                    MODULE STREAMER, WG-24A
                                     
21289300                60049                    MODULE STREAMER, WG-24A
                                     
21289300                60050                    MODULE STREAMER, WG-24A
                                     
21289300                60051                    MODULE STREAMER, WG-24A
                                     
21289300                60052                    MODULE STREAMER, WG-24A
                                     
21289300                60053                    MODULE STREAMER, WG-24A
                                     
21289300                60054                    MODULE STREAMER, WG-24A
                                     
21289300                60055                    MODULE CABLE HEAD, WG-24A
                                     
21295500                80025                    MODULE CABLE HEAD, WG-24A
                                     
21295500                80035                    MODULE CABLE HEAD, WG-24A
                                     
21295500                80039                    MODULE CABLE HEAD, WG-24A
                                     
21295600                70360                    MODULE CONNECTOR, WG-24A
                                     
21295600                70393                    MODULE CONNECTOR, WG-24A
                                     
21295600                70398                    MODULE CONNECTOR, WG-24A
                                     
21295600                70404                    MODULE CONNECTOR, WG-24A
                                     
21295600                70410                    MODULE CONNECTOR, WG-24A
                                     
21295600                70413                    MODULE CONNECTOR, WG-24A
                                     
21295600                70414                    MODULE CONNECTOR, WG-24A
                                     
21295600                70417                    MODULE CONNECTOR, WG-24A
                                     
21295600                70418                    MODULE CONNECTOR, WG-24A
                                     
21295600                70423                    MODULE CONNECTOR, WG-24A
                                     
21295600                70428                    MODULE CONNECTOR, WG-24A
                                     
21295600                70435                    MODULE CONNECTOR, WG-24A
                                     
21295600                70436                    MODULE CONNECTOR, WG-24A
</TABLE>                             
                                     
              
              


                                    Page: 2
<PAGE>   10
                               INPUT/OUTPUT INC.


CSA Number:      960930
Customer:        HORIZON EXPLORATION INC
Schedule A

<TABLE>
<CAPTION>
PART NUMBER         SERIAL NUMBER              DESCRIPTION
<S>                    <C>                     <C>
21295600               70437                   MODULE CONNECTOR, WG-24A
                                     
21295600               70438                   MODULE CONNECTOR, WG-24A
                                     
21295600               70443                   MODULE CONNECTOR, WG-24A
                                     
21295600               70444                   MODULE CONNECTOR, WG-24A
                                     
21295600               70445                   MODULE CONNECTOR, WG-24A
                                     
21295600               70449                   MODULE CONNECTOR, WG-24A
                                     
21295600               70450                   MODULE CONNECTOR, WG-24A
                                     
21295600               70451                   MODULE CONNECTOR, WG-24A
                                     
21295600               70452                   MODULE CONNECTOR, WG-24A
                                     
21295600               70453                   MODULE CONNECTOR, WG-24A
                                     
21295600               70455                   MODULE CONNECTOR, WG-24A
                                     
21295600               70457                   MODULE CONNECTOR, WG-24A
                                     
21295600               70458                   MODULE CONNECTOR, WG-24A
                                     
21295600               70459                   MODULE CONNECTOR, WG-24A
                                     
21295600               70460                   MODULE CONNECTOR, WG-24A
                                     
21295600               70461                   MODULE CONNECTOR, WG-24A
                                     
21295600               70462                   MODULE CONNECTOR, WG-24A
                                     
21295600               70464                   MODULE CONNECTOR, WG-24A
                                     
21295600               70469                   MODULE CONNECTOR, WG-24A
                                     
21295600               70470                   MODULE CONNECTOR, WG-24A
                                     
21295600               70471                   MODULE CONNECTOR, WG-24A
                                     
21295600               70472                   MODULE CONNECTOR, WG-24A
                                     
21295600               70478                   MODULE CONNECTOR, WG-24A
                                     
21295600               70485                   MODULE CONNECTOR, WG-24A
                                     
21295600               70486                   MODULE CONNECTOR, WG-24A
                                     
21295600               70488                   MODULE CONNECTOR, WG-24A
                                     
21295600               70489                   MODULE CONNECTOR, WG-24A
                                     
21295700               90022                   MODULE TERMINATOR, WG-24A
                                     
21295700               90025                   MODULE TERMINATOR, WG-24A
                                     
21295700               90048                   MODULE TERMINATOR, WG-24A
</TABLE>                             
                                     
                
                


                                    Page: 3
<PAGE>   11
                               INPUT/OUTPUT INC.


CSA Number:      960930
Customer:        HORIZON EXPLORATION INC
Schedule A

<TABLE>                            
<CAPTION>                          
PART NUMBER        SERIAL NUMBER              DESCRIPTION
<S>                 <C>                       <C>
52174               No Serial #               OOKITT, MSX SHIPBOARD SYS
                                   
5750007             596-044020-1              DECABL WG-24, ELECTRICAL, 75 MET
                                   
5750007             596-044020-2              DECABL WG-24, ELECTRICAL, 75 MET
                                   
5750025             5750025-23                DECABL WG-24, OPTICAL, 75 METERS
                                   
5750025             5750025-24                DECABL WG-24, OPTICAL, 75 METERS
                                   
5750027             996-066350-1              JUMPER WG-24, DECK/HUB BOX BYPA
                                   
5750027             996-066350-2              JUMPER WG-24, DECK/HUB BOX BYPA
                                   
57520028            996-064840-3               ELAST MSX24, SERIES 3, HEAD
                                   
57520028            996-064840-4               ELAST MSX24, SERIES 3, HEAD
                                   
57520028            996-064840-6               ELAST MSX24, SERIES 3, HEAD
                                   
57520028            996-064840-7               ELAST MSX24, SERIES 3, HEAD
                                   
5752003             1096-068510-1             ELAST MSX24, 70 METER, HEAD
                                   
5752003             1096-068510-2             ELAST MSX24, 70 METER, HEAD
                                   
5752003             1096-068510-3             ELAST MSX24, 70 METER, HEAD
                                   
5752003             1096-068510-4             ELAST MSX24, 70 METER, HEAD
                                   
5753019             895-014790-2A             LEADIN WG-24, SERIES 2, HAIRED, S
                                   
5753019             895-014790-2B             LEADIN WG-24, SERIES 2, HAIRED, S
                                   
5753019             996-066830-1              LEADIN WG-24, SERIES 2, HAIRED, S
                                   
5754006-75          996-066790-1              CABASY STICK, POWER TAIL SWIVEL
                                   
5754006-75          996-066790-2              CABASY STICK, POWER TAIL SWIVEL
                                   
5801902             No serial # -1            BRACKT TOWING ASSEMBLY, 217" D
                                   
5801902             No serial # -2            BRACKT TOWING ASSEMBLY, 217" D
                                   
5804003             996-067500-1              TRANSITION, MXS, ADAPTER CBL HD
                                   
5804003             996-067500-2              TRANSITION, MXS, ADAPTER CBL HD
                                   
5804003             996-067500-3              TRANSITION, MXS, ADAPTER CBL HD
                                   
5805001             896-63180-10              ELAST MSX24A, TAIL, 85M
                                   
5805001             896-63180-11              ELAST MSX24A, TAIL, 85M
                                   
5805001             896-63180-8               ELAST MSX24A, TAIL, 85M
                                   
5805001             896-63180-9               ELAST MSX24A, TAIL, 85M
                                   
5806002             996-066280-5              ADAPTER MSX-24A, TAIL, SWIVEL, PW
</TABLE>                           
                                   




                                    Page: 4
<PAGE>   12
                               INPUT/OUTPUT INC.


CSA Number:      960930
Customer:        HORIZON EXPLORATION INC
Schedule A

<TABLE>
<CAPTION>
PART NUMBER      SERIAL NUMBER              DESCRIPTION
<S>               <C>                       <C>
5806002           996-066280-6              ADAPTER MSX-24A, TAIL, SWIVEL, PW
                                   
5831002           396-044940-1              ACTIVE MSX-24A, 125M GROUP, 3R
                                   
5831002           396-044940-11             ACTIVE MSX-24A, 125M GROUP, 3R
                                   
5831002           396-044940-12             ACTIVE MSX-24A, 125M GROUP, 3R
                                   
5831002           396-044940-13             ACTIVE MSX-24A, 125M GROUP, 3R
                                   
5831002           396-044940-14             ACTIVE MSX-24A, 125M GROUP, 3R
                                   
5831002           396-044940-15             ACTIVE MSX-24A, 125M GROUP, 3R
                                   
5831002           396-044940-16             ACTIVE MSX-24A, 125M GROUP, 3R
                                   
5831002           396-044940-17             ACTIVE MSX-24A, 125M GROUP, 3R
                                   
5831002           396-044940-18             ACTIVE MSX-24A, 125M GROUP, 3R
</TABLE>                           
                                   
                                   
                                   
                                   

                                    Page: 5

<PAGE>   1
                                                                         10.4.1

NAME OF PROMISSOR:              Horizon Exploration LTD
AMOUNT PROMISED:                $306,180.00 U.S. Dollars
INTEREST RATE:                  11.25% PER ANNUM

                              Installment Note

        1.      For value received, the undersigned, Horizon Exploration LTD
("Borrower") promises to pay to TELEDYNE BROWN ENGINEERING MARINE PRODUCTS, A
DIVISION OF TELEDYNE INDUSTRIES, INC. or its assignee, the principal sum of
$306,180.00 U.S. Dollars, with interest at the rate of 11.25% per annum on the
unpaid balance of that principal sum until paid.  The Borrower promises to pay
that principal sum and interest in installments as follows:  $54,214.00 U.S.
Dollars on the 10th day of April, 1977, and five (5) successive installments of
$54,214.00 U.S. Dollars on the same day of each succeeding calendar month until
all such installment payments have been made, on which date the entire unpaid
balance of principal and interest shall be due and payable.

                           Allocation of Payments

        2.      Each installment, when paid, shall be credited first to the
interest then due, and the remainder shall be credited to principal.  Interest
shall cease to accrue on the principal so credited.

                                Acceleration

        3.      In the event Borrower fails to make payment of any part or
installment of principal or interest when due, the whole sum of the principal
then unpaid, together with accrued interest, shall become immediately due and
payable at the option of the holder of this Note.  Borrower expressly waives
demand for payment, notice of intention to accelerate, and notice of
acceleration.

<PAGE>   2

                              Collection Costs

        4.      Borrower agrees to pay the actual expenditures made in any
attempt to collect the amount due to pursuant to this Note, including any
reasonable attorney's fees incurred by the holder.

                                 Collateral

        5.      Syntrak Active Sections as listed on Teledyne Brown Engineering
Marine Products invoice number 12293 dated 12/25/96 (Serial Numbers
1296-42160A-001 through 1296-42160A-010 and 1296-42160B-011 through
1296-42160B-028).

                            Additional Conditions

        6.      Legal title to the equipment covered by this agreement shall
remain with Teledyne Brown Engineering Marine Products for the term of this
agreement.

        7.      Borrower shall at all times insure the equipment against all
risk of loss or damage from every cause whatsoever, for not less than its full
replacement value as determined by Teledyne Brown Engineering Marine Products,
and shall carry public liability, contractual liability, and proper damage
insurance covering the equipment, its operation and use.  All such insurance
shall be in a form and amount and with companies approved by Teledyne Brown
Engineering Marine Products, and shall be in the joint names of Teledyne Brown
Engineering Marine Products and Borrower.  The Borrower shall pay the premium
therefore and deliver said policies, duplicates or certificates of insurance
thereof to Teledyne Brown Engineering Marine Products.

<PAGE>   3


        The undersigned Corporation has caused this Note to be executed by its
officers duly authorized to execute instruments of indebtedness.


                                BORROWER,



                                BY: /s/ [illegible signature]      
                                   -------------------------------------
                                    signature

                                        
                                            [illegible]               
                                ----------------------------------------
                                         typed name and title



                                BY:   /s/ Neil A.H. Campbell       
                                   -------------------------------------
                                      signature
 


                                Neil A.H. Campbell  Finance Director
                                ----------------------------------------
                                        typed name and title


<PAGE>   1

                                                                          10.4.2
                                PROMISSORY NOTE

NAME OF PROMISSOR:                Horizon Exploration LTD
AMOUNT PROMISED:                  $330,000.00 U.S. Dollars
INTEREST RATE:                    12.00% PER ANNUM


                                INSTALLMENT NOTE

         1.      For value received, the undersigned, Horizon Exploration LTD
("Borrower") promises to pay to TELEDYNE BROWN ENGINEERING MARINE PRODUCTS, an
ALLEGHENY TELEDYNE COMPANY or its assignee, the principal sum of $330,000.00
U.S.  Dollars, with interest at the rate of 12.00% per annum on the unpaid
balance of that principal sum until paid.  The Borrower promises to pay that
principal sum and interest in installments as follows:  $56,941.00 U.S. Dollars
on the 30th day of May, 1997, and five (5) successive installments of
$56,941.00 U.S. Dollars on the same day of each succeeding calendar month until
all such installment payments have been made, on which date the entire unpaid
balance of principal and interest shall be due and payable.

                             ALLOCATION OF PAYMENTS

         2.      Each installment, when paid, shall be credited first to the
interest then due, and the remainder shall be credited to principal.  Interest
shall cease to accrue on the principal so credited.

                                  ACCELERATION

         3.      In the event Borrower fails to make payment of any part or
installment of principal or interest when due, the whole sum of the principal
then unpaid, together with accrued interest, shall become immediately due and
payable at the option of the holder of this Note.  Borrower expressly waives
demand for payment, notice of intention to accelerate, and notice of
acceleration.
<PAGE>   2
                                COLLECTION COSTS

         4.      Borrower agrees to pay the actual expenditures made in any
attempt to collect the amount due to pursuant to this Note, including any
reasonable attorney's fees incurred by the holder.

                                   COLLATERAL

         5.      Teledyne Brown Engineering Marine Products Model 41260 Digital
Active Sections Serial Numbers 297- 42160B-035 through 297-42160B-064.

                             ADDITIONAL CONDITIONS

         6.      Legal title to the equipment covered by this agreement shall
remain with Teledyne Brown Engineering Marine Products for the term of this
agreement.

         7.      Borrower shall at all times insure the equipment against all
risk of loss or damage from every cause whatsoever, for not less than its full
replacement value as determined by Teledyne Brown Engineering Marine Products,
and shall carry public liability, contractual liability, and proper damage
insurance covering the equipment, its operation and use.  All such insurance
shall be in a form and amount and with companies approved by Teledyne Brown
Engineering Marine Products, and shall be in the joint names of Teledyne Brown
Engineering Marine Products and Borrower.  The Borrower shall pay the premium
therefore and deliver said policies, duplicates or certificates of insurance
thereof to Teledyne Brown Engineering Marine Products.





                                       2
<PAGE>   3
                 The undersigned Corporation has caused this Note to be
executed by its officers duly authorized to execute instruments of
indebtedness.

                                           BORROWER



                                           By: /s/ Neil A.M. Campbell
                                                Signature

                                           Neil A.M. Campbell - Director
                                                typed name and title



                                           By: /s/ [illegible signature]
                                                Signature

                                           Director
                                                typed name and title






                                       3

<PAGE>   1
                                                                  EXHIBIT 10.5.1


METLIFE CAPITAL                                      LOAN AND SECURITY AGREEMENT


         THIS LOAN AND SECURITY AGREEMENT entered into as of the 22nd day of
February, 1996, by and between MetLife Capital Corporation, a Delaware
corporation, whose address is 10900 NE 4th, Suite #500, Bellevue, WA 98004
("Lender") and Seitel Geophysical, Inc., a Delaware corporation whose address
is 50 Briar Hollow Lane, West Bldg., 7th Floor, Houston, Texas 77027
("Borrower").

         WHEREAS, Lender has agreed to make a commercial loan or loans to
Borrower; and

         WHEREAS, as a condition to making the loans, and in order to secure
the repayment thereof, Lender has required Borrower to execute and deliver to
Lender this Loan and Security Agreement.

         NOW THEREFORE, for good and valuable consideration, the receipt and
adequacy of which are hereby acknowledged, Borrower and Lender agree as
follows:

         1.      CREATION OF SECURITY INTEREST.  As security for the due and
punctual payment of any and all of the present and future obligations of the
Borrower to Lender, whether direct of contingent or joint or several.  Borrower
hereby conveys, assigns and grants to Lender a continuing security interest in
all of Borrower's rights, title and interests in and to the equipment described
in the Supplemental Security Agreement(s) entered into pursuant to this Loan
and Security Agreement from time to time ("Equipment") including all present
and future additions, attachments and accessories thereto, all substitutions
therefor and replacements thereof and all proceeds thereof, including all
proceeds of insurance (such Equipment and property hereinafter called
"Collateral").

         2.      THE LOANS.  (a) Subject to the terms and conditions of this
Loan and Security Agreement, Lender agrees to make a loan or loans to Borrower.
The maximum principal amount of any loan or loans to be made by Lender to
Borrower shall be within Lender's discretion, subject to the exercise of
Lender's reasonable business judgment, and shall be as stated in the loan
commitment letter issued by Lender, in Lender's internal credit approval (each
such loan or loans shall be referred to as "the Loan Amount").

         (b)     The Loan Amount shall be repaid by Borrower as a term loan or
                 term loans ("Term Loan").  The Term Loan shall be evidenced by
                 a promissory note or notes in the form attached hereto as
                 Exhibit "A" ("Term Note").  The payment provisions of each
                 Term Note shall be stated therein.
<PAGE>   2


         (c)     If requested by Borrower, and in accordance with the terms and
                 conditions of Section 3 hereof, Lender shall make interim
                 fundings to Borrower of a Term Loan as partial advances of the
                 Loan Amount ("Interim Loans").  The Interim Loans shall either
                 be for the payment of the acquisition cost of any items of
                 Equipment delivered and accepted by Borrower prior to the
                 expiration date of Lender's loan commitment to Borrower
                 ("Commitment Expiration Date") or to fund progress payments to
                 the vendor or manufacturer of the Equipment, if the making of
                 progress payments was agreed to by Lender in its commitment or
                 approval to make the loan or loans to Borrower.  The interim
                 Loans shall be evidenced by promissory notes in the form
                 attached hereto as Exhibit "B" ("Interim Note").  Interest on
                 all Interim Loans shall be payable as provided therein. The
                 principal amount due under the Interim Loans shall be due as
                 provided in the Interim Notes, at which time, provided no
                 Event of Default hereunder has occurred and is continuing or
                 event which with the passing of time or giving of notice or
                 both would become an event of default hereunder has occurred
                 and is continuing.  Lender shall consolidate all Interim Loans
                 and convert them to a Term Loan evidenced by a Term Note or
                 Notes.  Whether or not a Term Loan is evidenced by one or more
                 Term Notes shall be as agreed between Lender and Borrower, or
                 in the absence of such an agreement, as decided by Lender, in
                 the exercise of its reasonable business judgment.

         (d)     In the event that the amount loaned pursuant to the Interim
                 Loans is less than the Loan Amount, subject to Borrower's
                 compliance with the terms and conditions of this Loan and
                 Security Agreement (including the satisfaction of the
                 conditions of borrowing set forth in Section 7 of this Loan
                 and Security Agreement, including but not limited to providing
                 Lender with a description of the items of Equipment), Lender
                 shall disburse to Borrower the balance of the Loan Amount on
                 the same date that the Interim Loans are converted into a term
                 loan.

         3.      METHOD FOR BORROWING ON INTERIM LOAN.  Borrower shall give
Lender at least five (5) business days written notice of a request for the
disbursement of an Interim Loan ("Request"), specifying the date on which the
Interim Loan is to disbursed.  Such Request shall be in the form attached
hereto as Exhibit "C".  Such Request shall be accompanied by an original copy
of the invoice or invoices to be paid from the Interim Loan.  Such Request
shall constitute a representation and warranty by the Borrower that (i) as of
the date of the Request no Event of Default or event which with the passing of
time or the giving of notice or both would constitute an Event of Default
hereunder has occurred and is
<PAGE>   3


continuing and (ii) in the event items of Equipment have been delivered to the
Borrower, Borrower has unconditionally accepted the Equipment from the vendor
thereof.  Subject to the conditions of this Loan and Security Agreement, Lender
shall disburse the Interim Loan to the invoicing party, or if Borrower shall
have paid the amount of such invoice, Lender shall reimburse Borrower, upon
receipt of proof of payment from Borrower.

         4.      CROSS COLLATERAL/CROSS DEFAULT.  All Collateral shall secure
the payment and performance of all of Borrower's liabilities and obligations to
Lender hereunder and under any of the loan documents relating hereto including,
but not limited to, all Interim Notes and all Term Notes (the Loan and Security
Agreement, the Interim Notes, the Term Notes, the Supplemental Security
Agreement(s) and all other loan documents may be referred to herein
collectively as the "Loan Documents").  Lender's security interest in the
Collateral shall not be terminated until and unless all of Borrower's
obligations to Lender under any of the Loan Documents are fully paid and
performed.  The occurrence of an event of default under any other of the Loan
Documents shall be deemed to be Event of Default hereunder and an Event of
Default hereunder shall be deemed to be an event of default under any other of
the Loan Documents.

         5.      REPRESENTATION AND WARRANTIES.  Borrower hereby represents and
warrants as follows:

         (a)     POWER AND AUTHORIZATION.  Borrower has the full power and
                 (corporate) authority to execute, deliver and perform
                 Borrower's obligations under the Loan Documents.  The
                 execution and delivery of the Loan Documents have been
                 authorized by all requisite corporate (or partnership) action
                 on the part of Borrower.  The execution, delivery and
                 performance of the Loan Documents have not constituted and
                 will not constitute a breach, default, or violation of or
                 under Borrower's articles of incorporation, by- laws
                 (partnership agreement), or any other agreement, indenture,
                 contract, lease, law, order, decree, judgment, or injunction
                 to which Borrower is a party or may be bound and have not
                 resulted and will not result in the creation of any lien upon
                 the Equipment pursuant to any agreement, indenture, lease,
                 contract or other instrument to which Borrower is a party,
                 except the lien created by this Loan and Security Agreement.

         (b)     EXISTENCE.  If Borrower is a corporation, Borrower (i) is duly
                 incorporated, validly existing and in good standing under the
                 laws of its state of incorporation, (ii) has all corporate
                 powers and all governmental licenses, authorizations, consents
                 and approvals required to carry on its business as now
                 conducted, and (iii) is duly
<PAGE>   4


                 qualified to transact business as a foreign corporation in
                 each jurisdiction where the Equipment will be located and in
                 the jurisdiction where its principal place of business is
                 located.  If Borrower is a partnership, Borrower (i) has been
                 duly formed as a (limited or general) partnership under the
                 laws of the state of its organization, (ii) is comprised of
                 the general partner(s) listed on the Schedule of Partners
                 attached to this Loan and Security Agreement, and (iii) is in
                 good standing under the laws of the state of its formation.

         (c)     BINDING EFFECT.  This Loan and Security Agreement constitutes
                 the valid and binding agreement of the Borrower; the Interim
                 Notes and the Term Note, when executed and delivered, will
                 constitute the valid and binding obligations of the Borrower;
                 and the Loan Documents are enforceable in accordance with
                 their terms except as (i) the enforceability thereof may be
                 limited by the bankruptcy laws, and (ii) rights of
                 acceleration and the availability of equitable remedies may be
                 limited by equitable principles of general applicability.

         (d)     LITIGATION.  There is no action, suit or proceeding against,
                 or to the knowledge of the Borrower, threatened against or
                 affecting the Borrower, before any court or arbitrator or any
                 governmental body, agency or official which has not been
                 previously disclosed to the Lender in writing and in which
                 there is a reasonable possibility of an adverse decision which
                 could materially adversely affect the business, financial
                 condition or results of operations of the Borrower or which
                 would in any manner draw into question the validity of any of
                 the Loan Documents.

         (e)     FILING OF TAX RETURNS.  The Borrower has filed all tax returns
                 required to have been filed and has paid all taxes shown to be
                 due and payable on such returns, including interest and
                 penalties, and all other taxes which are payable by it, to the
                 extent the same have become due and payable.  The Borrower
                 knows of no proposed tax assessment against it and all tax
                 liabilities of the Borrower are adequately provided for.

         (f)     TITLE.  The Borrower has or shall have at the time it executes
                 the Term Note good and indefeasible title to the Collateral
                 free and clear of all liens other than the Lender's lien.

         (g)     COMPLIANCE WITH LAW.  The business and operations of the
                 Borrower have been and are being conducted in accordance with
                 all applicable laws, rules and regulations, other
<PAGE>   5


                 than violations which could not (either individually or
                 collectively) have a material adverse effect on the financial
                 condition or operations of the Borrower.

         (h)     FULL DISCLOSURE.  All documents, records, instruments,
                 certificates, statements (including, but not by way of
                 limitation, financial statements of Borrower) and information
                 provided to Lender by Borrower in connection with this Loan
                 and Security Agreement are true and accurate in all material
                 respects and do not contain any untrue statement, or fail to
                 contain any statement of a material fact necessary to make the
                 statements contained herein or therein not misleading.  There
                 is no fact known to the Borrower that Borrower has not
                 disclosed in writing which could materially and adversely
                 affect the financial condition or operations of Borrower.

         (i)     SECURITY INTEREST.  The security interest granted to Lender
                 hereunder is a valid, first priority security interest in the
                 Collateral and has been or promptly after the execution of the
                 Supplemental Security Agreement describing the Collateral will
                 be, perfected in accordance with the requirements of all
                 states in which any item of the Collateral is located.

         (j)     PERSONAL PROPERTY.  Under the laws of the state(s) in which
                 the Collateral is deemed to consist solely of personal
                 property.

         (k)     POLLUTION AND ENVIRONMENTAL CONTROL.  Borrower has obtained
                 all permits, licenses and other authorizations which are
                 required under, and is in material compliance with, all
                 federal, state, and local laws and regulations relating to
                 pollution, reclamation, or protection of the environment,
                 including laws relating to emissions, discharges, releases or
                 threatened releases of pollutants, contaminants, or hazardous
                 or toxic materials or wastes into air, water, or land, or
                 otherwise relating to the manufacture, processing,
                 distribution, use, treatment, storage, disposal, transport, or
                 handling of pollutants, contaminants or hazardous or toxic
                 materials or wastes.  Borrower shall maintain all such
                 permits, licenses, and authorizations current.

         6.      COVENANTS.  Borrower hereby agrees and covenants as follows:

         (a)     PAYMENT.  Borrower shall pay the indebtedness secured hereby
                 as provided herein and in the Interim Notes and Term Notes.
<PAGE>   6


         (b)     LOCATION OF COLLATERAL.  Borrower will keep the Collateral
                 located at the location or locations stated on the
                 Supplemental Security Agreements, provided, however, that
                 Borrower may change the location of the collateral with
                 Lender's prior written consent.

         (c)     NO LIENS.  Except for the security interest granted hereby or
                 under any other agreement under which Lender is the secured
                 party, whether as mortgagee, beneficiary or otherwise,
                 Borrower shall keep the Collateral free and clear of any
                 security interest, lien or encumbrance of any kind and
                 Borrower shall not sell, assign (by operation of law or
                 otherwise) exchange or otherwise dispose of any of the
                 Collateral.

         (d)     INSURANCE.  Borrower shall procure and continuously maintain
                 and pay for (a) all risk physical damage and property
                 insurance covering loss or damage to the equipment for not
                 less than the full replacement value thereof naming Lender as
                 loss payee and (b) bodily injury and property damage combined
                 single limit liability insurance, all in such amounts and
                 against such risks and hazards as are reasonably required by
                 Lender, with insurance companies and pursuant to contracts or
                 policies with deductibles to Lender.  All contracts and
                 policies shall include provisions for the protection of
                 Borrower, shall provide for payment of insurance proceeds to
                 Lender, shall provide that they may not be modified,
                 terminated or cancelled unless Lender is given at least thirty
                 (30) days advance written notice thereof, and shall provide
                 that the coverage is "primary coverage" for the protection of
                 Borrower or Lender notwithstanding any other coverage carried
                 by Lender protecting against similar risks.  Borrower shall
                 promptly notify any appropriate insurer and Lender of each and
                 every occurrence, which may become the basis of a claim or
                 cause of action against the insured and provide Lender with
                 all data pertinent to such occurrence.  Borrower shall furnish
                 Lender with certificates of such insurance or copies of
                 policies upon request and shall furnish Lender with renewal
                 certificates not less than thirty (30) days prior to the
                 renewal date.  Proceeds of all insurance are payable first to
                 Lender to the extent of its interest.

         (e)     FINANCING STATEMENTS.  At the request of Lender, Borrower will
                 join Lender in executing one or more financing statements
                 pursuant to the Uniform Commercial Code and other documents
                 deemed necessary by Lender under applicable law to record or
                 perfect its security interest in the Collateral, including
                 continuation statements, in
<PAGE>   7


                 form satisfactory to Lender and will pay the cost of filing
                 the same in all public offices wherever filing is deemed by
                 Lender to be necessary or desirable.  Borrower hereby
                 authorizes Lender, in such jurisdictions where such action is
                 authorized by law, to effect any such recordation or filing of
                 financing statements or other documents without Borrower's
                 signature thereto.

         (f)     CHANGE OF NAME OR ADDRESS.  Borrower will immediately notify
                 Lender in writing of any change in its place of business or
                 the adoption or change of any tradename or fictitious business
                 name, and will upon request of Lender, execute any additional
                 financing statements or other similar documents necessary to
                 perfect or maintain its security interest.

         (g)     USE OF EQUIPMENT, MAINTENANCE.  Borrower will cause the
                 Equipment to be used in a careful and proper manner, will
                 comply with and conform to all governmental laws, rules and
                 regulations relating thereto, and will cause the Equipment to
                 be operated in accordance with the manufacture's or supplier's
                 instructions or manuals and only by competent and duly
                 qualified personnel.  Borrower will cause the Equipment to be
                 kept and maintained in good repair, condition and working
                 order and will furnish all parts, replacements, mechanisms,
                 devices and servicing required therefor so that the value,
                 condition and operating efficiency thereof will at all times
                 be maintained and preserved, normal wear and tear excepted.
                 All such repairs, parts, mechanisms, devices and replacements
                 shall immediately, without further act, become part of the
                 Equipment and subject to the security interest created by this
                 Loan and Security Agreement.  Borrower will not make any
                 improvement, change, addition or alteration to the Equipment
                 if such improvement, change, addition or alteration will
                 impair the originally intended function or use of the
                 Equipment or impair the value of the Equipment as it existed
                 immediately prior to such improvement, change, addition or
                 alteration.  Any part added to the Equipment in connection
                 with any improvement, change, addition or alteration shall
                 immediately, without further act, become part of the Equipment
                 and subject to the security interest created by this Loan and
                 Security Agreement.

         (h)     INSPECTION.  Lender may at any reasonable time or times
                 inspect the Equipment and may at any reasonable time or times
                 inspect the books and records of Borrower.

         (i)     TAXES.  Borrower shall promptly pay, when due, all charges,
                 fees, assessments and taxes (excluding all taxes
<PAGE>   8


                 measured by Lender's income) which may now or hereafter be
                 imposed upon the ownership, leasing, possession, sale or use
                 of the Collateral.

         (j)     PERFORMANCE BY LENDER.  If Borrower fails to perform any
                 agreement or obligation contained herein, Lender may itself
                 perform, or cause the performance of such agreement or
                 obligation.  Borrower will pay, or reimburse Lender, on
                 demand, for any and all fees, including attorneys' fees, costs
                 and expenses of whatever kind or nature incurred by Lender in
                 connection with (i) the creation, preservation and protection
                 of Lender's security interest in the Collateral, including,
                 without limitation, all fees and taxes in connection with the
                 recording or filing of instruments and documents in public
                 offices, (ii) payments or discharge of any taxes or liens upon
                 or in respect of the Collateral, (iii) premiums for insurance
                 with respect to the Equipment and (iv) this Loan and Security
                 Agreement and with protecting, maintaining or preserving the
                 Collateral and Lender's interests therein, whether through
                 judicial proceedings or otherwise, or in connection with
                 defending or prosecuting any actions, suits or proceedings
                 arising out of or related to the Loan and Security Agreement
                 and the Loan Documents or in connection with any debt
                 restructuring, loan workout negotiations or bankruptcy or
                 insolvency case or proceedings.  All such amounts shall
                 constitute obligations of Borrower secured by the Collateral,
                 in the event that Borrower fails to perform any of its
                 agreements contained herein, Borrower will, on demand,
                 reimburse Lender for all such expenditure until fully
                 reimbursed at the rate of two percent (2%) per month on the
                 outstanding balance of such expenditures or the highest rate
                 permitted by law, whichever is less.

         (k)     POWER OF ATTORNEY.  Borrower hereby irrevocably appoints
                 Lender Borrower's attorney-in-fact, with full authority in the
                 place and stead of Borrower and in the name of Borrower or
                 otherwise, from time to time in the Lender's discretion, to
                 take any action and to execute any instrument which Lender may
                 deem necessary or advisable to accomplish the purposes of this
                 Loan and Security Agreement, including, without limitation:
                 (i) to obtain, compromise and adjust insurance required to be
                 paid to Lender; (ii) to ask, demand, collect, sue for,
                 recover, receive, and give acquittance and receipts for moneys
                 due and to become due under or in respect of any of the
                 Collateral; (iii) to receive, endorse, and collect any drafts
                 or other instruments, documents, and chattel paper in
                 connection with clause (i) or (ii) above; and (iv) to file any
                 claims or take any action or institute any
<PAGE>   9


                 proceedings which Lender may deem necessary or desirable for
                 the collection of any of the Collateral or otherwise to
                 enforce the rights of lender with respect to any of the
                 Collateral.

         (l)     NO DUTIES.  The powers conferred on Lender hereunder are
                 solely to protect its interest in the Collateral and shall not
                 impose any duty upon it to exercise any such powers.  Except
                 for the safe custody of any Collateral in its possession and
                 the accounting for moneys actually received by it hereunder,
                 Lender shall have no duty as to any Collateral or as to the
                 taking of any necessary steps to preserve rights against prior
                 parties or any other rights pertaining to any Collateral.

         (m)     FINANCIAL DATA.  Borrower will furnish to Lender and will
                 cause any guarantor of Borrower's obligations to furnish to
                 Lender on request (i) annual balance sheet and profit and loss
                 statements prepared in accordance with generally accepted
                 accounting principles and practices consistently applied and,
                 if Lender so requires, accompanied by the annual audit report
                 of an independent certified public accountant reasonably
                 acceptable to Lender, and (ii) all other financial information
                 and reports that Lender may from time to time reasonably
                 request, including, if Lender so requires, income tax returns
                 of Borrower and any guarantor of Borrower's obligations
                 hereunder.

         7.      CONDITIONS OF BORROWING.  Lender shall not be obligated to
make any loan hereunder unless:

         (a)     The Interim Notes or Term Notes evidence such loan shall have
                 been duly executed and delivered to Lender.

         (b)     Borrower shall have executed and delivered to Lender the
                 Supplemental Security Agreement describing the Collateral and
                 stating, except with respect to progress payment fundings, the
                 location thereof.

         (c)     Except with respect to progress payment fundings, Lender shall
                 have received evidence (as described in Section 6d hereof)
                 that insurance has been obtained in accordance with the
                 provisions of this Loan and Security Agreement.

         (d)     Lender shall have received any and all third party consents,
                 waivers, or releases deemed necessary or desirable by it in
                 connection with the loan and the Collateral being financed,
                 including, without limitation, Uniform Commercial Code lien
                 releases and the consent and waiver, in form and substance
                 satisfactory to Lender, of each and every realty owner,
                 landlord and mortgagee
<PAGE>   10


                 holding an interest in or encumbrance on the real property
                 where any of the Collateral is to be located.

         (e)     All filings, recordings and other actions deemed necessary or
                 desirable by Lender in order to establish, protect, preserve
                 and perfect its security interest in the Collateral being
                 financed by such loan as a valid perfected first priority
                 security interest shall have been duly effected, including,
                 without limitation, the filing of financing statements and the
                 recordation of landlord (owners) and/or mortgagee waivers or
                 disclaimers, all in form and substance satisfactory to Lender,
                 and all fees, taxes and other charges relating to such filings
                 and recordings shall have been paid by Borrower.

         (f)     The representations and warranties contained in this Loan and
                 Security Agreement shall be true and correct in all respects
                 on and as of the date of the making of any loan hereunder with
                 the same effect as if made on and as of such date.

         (g)     In the sole judgment of Lender, there shall have been no
                 material adverse change in the financial condition, business
                 or operations of Borrower from the earliest date of any
                 financial statement, credit report, business report or similar
                 document submitted to Lender for its review.

         (h)     All Loan Documents shall be satisfactory to Lender's
                 attorneys; and

         (i)     Lender shall have received, in form and substance satisfactory
                 to Lender, such other documents as Lender shall require
                 including, but not limited to a Request, proof of payment,
                 vendor invoices and certificates of authority and incumbency.

         8.      DEFAULT.  The occurrence of any of the following events,
following the giving of any required notice and/or the expiration of any
applicable period of grace, shall constitute an event of default ("Event of
Default") hereunder.

         (a)     Borrower's default in payment of any installment of the
                 principal of or interest on any Interim Note or Term Note when
                 and after the same shall become due and payable, whether at
                 the due date thereof or by acceleration or otherwise, which
                 default shall continue unremedied for ten (10) days; or

         (b)     The failure by Borrower to make payment of any other
<PAGE>   11


         amount payable hereunder or under any Interim Note or Term Note, and
         the continuance of such failure for more than ten (10) days after
         written notice thereby by Lender to Borrower; or

         (c)     The failure by Borrower to perform or observe any covenant,
                 condition, obligation or agreement to be performed or observed
                 by it hereunder, which failure shall continue unremedied for
                 thirty (30) days after written notice thereof by Lender to
                 Borrower; or

         (d)     The occurrence of a default described in Section 4 hereof; or

         (e)     Any warranty, representation or statement made or furnished
                 with respect to Borrower or the Collateral to Lender by or on
                 behalf of Borrower, in connection with this Loan and Security
                 Agreement, or the indebtedness secured hereby, shall prove to
                 have been false in any adverse, material respect when made or
                 furnished; or

         (f)     Borrower shall become insolvent or bankrupt or make an
                 assignment for the benefit of creditors or consent to the
                 appointment of a trustee or receiver; or a trustee or a
                 receiver shall be appointed for Borrower or for a substantial
                 part of its property without its consent and shall not be
                 dismissed for a period of sixty (60) days; or bankruptcy,
                 reorganization, liquidation, insolvency or dissolution
                 proceedings shall be instituted by or against Borrower and, if
                 instituted against Borrower, shall be consented to or be
                 pending and not dismissed for a period of sixty (60) days; or
                 any execution or writ of process shall be issued under any
                 action or proceeding against Borrower in such capacity whereby
                 any of the Collateral may be taken or restrained; Borrower
                 shall cease doing business as a going concern; or, without the
                 prior written consent of Lender, Borrower shall sell, transfer
                 or dispose of all or substantially all of its assets or
                 property; or

         (g)     The liquidation, merger, consolidation, reorganization,
                 conversion to an "S" status or dissolution, if Borrower is a
                 corporation or partnership, of Borrower, if in Lender's
                 reasonable opinion, such act shall materially and adversely
                 affect Borrower's ability to perform under any of the Loan
                 Documents; or

         (h)     Any item of Collateral is seized or levied on under legal or
                 governmental process or for any reason Lender deems itself
                 insecure.  Lender shall be entitled to deem itself insecure
                 when some event occurs, fails to occur or is
<PAGE>   12


                 threatened or some objective condition exists or is threatened
                 which significantly impairs the prospects that any of
                 Borrower's obligations to Lender will be paid when due, which
                 significantly impairs the value of the Collateral to Lender or
                 which significantly affects the financial or business
                 condition of Borrower.

                          The occurrence of an Event of Default shall terminate
                 any commitment or obligation by Lender to make any of the
                 loans contemplated by this Loan and Security Agreement.

         9.      REMEDIES UPON DEFAULT.  Upon the occurrence of an Event of
Default hereunder.  Lender may, at its option, do any one or more of the
following:

         (a)     Declare all obligations of Borrower to Lender to be
                 immediately due and payable, whereupon all unpaid principal of
                 and interest on said indebtedness and other amounts declared
                 due and payable shall be and become immediately due and
                 payable.

         (b)     Take possession of all or any of the Collateral and exclude
                 therefrom Borrower and all others claiming under Borrower, and
                 thereafter hold, store, use, operate, manage, maintain and
                 control, make repairs, replacements, alterations, additions
                 and improvements to and exercise all rights and powers of
                 Borrower in respect to the Collateral or any part thereof.  In
                 the event Lender demands, or attempts to take possession of
                 the Collateral in the exercise of any rights under this Loan
                 and Security Agreement, Borrower promises and agrees to
                 promptly turn over and deliver complete possession thereof to
                 Lender.

         (c)     Require Borrower to assemble the Collateral, or any portion
                 thereof, at a place designated by Lender and reasonably
                 convenient to both parties, and promptly to deliver such
                 Collateral to Lender, or an agent or representative designated
                 by it;

         (d)     Sell, lease or otherwise dispose of the Collateral at public
                 or private sale, without having the Collateral at the place of
                 sale, and upon terms and in such manner as Lender may
                 determine (and Lender may be a purchaser at any sale); and

         (e)     Exercise any remedies of a secured party under the Uniform
                 Commercial Code as adopted in the state where the Collateral
                 is located or any other applicable law.
<PAGE>   13


                          Except as to portions of the Collateral which are
                 perishable or threaten to decline speedily in value or are of
                 a type customarily sold on a recognized market.  Lender shall
                 give Borrower at least ten (10) days prior written notice of
                 the time and date of any public or private sale of the
                 Collateral or other intended disposition thereof to be made.
                 Such notice may be mailed to Borrower at the address set forth
                 in the first paragraph of this Loan and Security Agreement.
                 Borrower hereby specifically agrees (to the extent that
                 applicable law and public policy allows it to effectively do
                 so) that any public or private sale held in accordance with
                 the terms of this Loan and Security Agreement shall, for the
                 purpose of the Uniform Commercial Code as adopted in the state
                 where the Collateral is located and for all other purposes, be
                 deemed to have been conducted in a commercially reasonable
                 manner and in good faith.

                          The proceeds of any sale under Section 9(d) shall be
                 applied as follows:

                          (i)     To the repayment of the costs and expenses of
                                  taking, holding and preparing for the sale
                                  and the selling of the Collateral (including
                                  legal expenses and attorneys' fees) and the
                                  discharge of all assessments, encumbrances,
                                  charges or liens, if any, on the Collateral
                                  prior to the lien hereof (except any taxes,
                                  assessments, encumbrances, charges or liens
                                  subject to which such sale shall have been
                                  made);

                          (ii)    To the payment of the whole amount then due
                                  and unpaid of the indebtedness of Borrower to
                                  Lender;

                          (iii)   To the payment of other amounts then secured
                                  hereunder; and

                          (iv)    The surplus, if any shall be paid to the
                                  Borrower or to whomsoever may be lawfully
                                  entitled to received the same.

                          Lender shall have the right to enforce one or more
                 remedies hereunder, successively or concurrently, and such
                 action shall not operate to estop or prevent Lender from
                 pursuing any further remedy which it may have, and any
                 repossession or retaking or sale of the Collateral pursuant to
                 the terms hereof shall not operate to release Borrower until
                 full payment of any deficiency has been made in cash.
<PAGE>   14



         10.     LIMITATION ON INTEREST.  It is the intent of the parties to
this Loan and Security Agreement to contract in strict compliance with
applicable usury laws from time to time in effect.  In furtherance thereof, the
parties stipulate and agree that none of the terms and provisions contained in
the Loan Documents shall ever be construed to create a contract to pay for the
use, forbearance or detention of money at a rate in excess of the maximum
interest rate permitted to be charged by applicable law from time to time in
effect.

         11.     PERSONAL PROPERTY/TAGS.  No item of Equipment will be attached
or affixed to realty or any building without Lender's prior knowledge and
written consent and waiver of the landlord and the mortgagee, if any, of the
real property.  If so requested by Lender, Borrower will affix tags supplied by
Lender, reflecting Lender's security interest in the Equipment.

         12.     LOSS AND DAMAGE.  Borrower shall bear the risk of damage,
loss, theft, or destruction, partial or complete of the Equipment, whether or
not such loss or damage is covered by insurance, except that while Borrower is
not in default.  Lender agrees to apply toward payment of obligations of
Borrower insurance proceeds payable to Lender by reason of such damage, loss,
theft or destruction.  In the event of any damage, loss, theft, or destruction,
partial or complete, of any item of Equipment, Borrower shall promptly notify
Lender in writing and at the option of Lender (a) repair or restore the
Equipment to good condition and working order, or (b) replace the Equipment
with similar equipment in good repair, condition and working order, or (c) pay
Lender, in cash, an amount equal to the unamortized equipment cost for the item
or if the Equipment was not purchased with the loan proceeds, the pro rata
portion of the outstanding principal balance due under the interim Note or Term
Note, as the case may be, and all other amounts relating to that item of
Equipment then due and owing hereunder, and upon payment of that amount,
Lender's lien shall be terminated with respect to that item of Equipment only,
and Lender will release its interest in that item of Equipment.

         13.     ASSIGNMENT.  Borrower may not assign or transfer any rights
under this Loan and Security Agreement or to the Collateral without Lender's
prior written consent.

         14.     INDEMNIFICATION.  Borrower shall indemnify and hold harmless
Lender from and against any and all claims, losses, liabilities, causes of
action, costs and expenses (including the fees of Lender's attorneys)
("Claims") in any way relating to or arising out of this Loan and Security
Agreement, the other Loan Documents or the Collateral, except for any Claims
resulting solely and directly from Lender's gross negligence or willful
misconduct.
<PAGE>   15


         15.     NOTICES.  Whenever Borrower or Lender shall desire to give or
service any notice, demand, request or other communication with respect to this
Loan and Security Agreement, each such notice, demand, request or communication
shall be in writing and shall be effective only if the same is physically
delivered or is by certified mail, postage prepaid, return receipt requested,
or by overnight courier, postage prepaid, mailed to the parties at the
addresses set forth in the first paragraph of this Loan and Security Agreement,
with a copy to Lender's Vice President of Credit.  Any party hereto may change
its address for such notices by delivering or mailing to the other parties
hereto, as aforesaid, a notice of such change.

         16.     NO WAIVER BY LENDER.  By exercising or failing to exercise any
of its rights, options or elections hereunder, Lender shall not be deemed to
have waived any breach or default on the part of Borrower from any of the
obligations secured hereby, unless such waiver or release is in writing and is
signed by Lender.  In addition, the waiver by Lender of any breach hereof for
default in payment of an indebtedness secured hereby shall not be deemed to
constitute a waiver of any succeeding breach or default.

         17.     FURTHER AGREEMENTS.  From time to time, Borrower will execute
such further instruments as Lender may reasonably require, in order to protect,
preserve, and maintain the security interest granted hereby.

         18.     BINDING UPON SUCCESSORS.  All agreements, covenants,
conditions and provisions of this Loan and Security Agreement shall apply to
and hold the successors and assigns of all parties hereto.

         19.     GOVERNING LAWS.  This Loan and Security Agreement shall be
governed by the laws of the State of Washington.

         20.     AMENDMENT.  This Loan and Security Agreement can be modified
or rescinded only by a writing expressly referring to this Loan and Security
Agreement, signed by both of the parties hereto.

         21.     INVALIDITY OF PROVISIONS.  Every provision of this Loan and
Security Agreement is intended to be severable.  In the event that any term or
provision hereof is declared by a court to be illegal or invalid for any reason
whatsoever, such illegality or invalidity shall not affect the balance of the
terms and provisions hereof, which terms and provisions shall remain binding
and enforceable, then to the extent possible all of the other provisions shall
nonetheless remain in full force and effect.

IN WITNESS WHERE, Borrower and Lender have duly executed this Loan and Security
Agreement the day and year first above written.
<PAGE>   16


                                        
Lender: MetLife Capital Corporation     Borrower: Seitel Geophysical, Inc.
        ---------------------------              -------------------------

By:    /s/ Judy Johnston                By:   /s/ Debra D. Valice     
    ---------------------------            --------------------------

(Print Name):  Judy Johnston            (Print Name):  Debra D. Valice

Title:  Vice President                  Title:  Secretary/Treasurer

                                        Social Security No.:
                                                            -------------------
                                        (If Borrower is an individual)

                                        Federal Tax
                                        Identification No.:  76-0388456

<PAGE>   1
                                                                  EXHIBIT 10.5.2

                      ASSIGNMENT AND ASSUMPTION AGREEMENT

         This Assignment and Assumption Agreement (the "Agreement") is entered
into as of the 31st day of December, 1996, between SEITEL GEOPHYSICAL, INC.
("Assignor") a Delaware corporation, with its principal place of business at 50
Briar Hollow Lane West, 7th Floor, Houston, Texas 77027 and EAGLE GEOPHYSICAL,
INC. ("Assignee"), a Delaware corporation, with its principal place of business
at 50 Briar Hollow Lane West, 7th Floor, Houston, Texas 77027.

                                  WITNESSETH:

         WHEREAS, Assignor, as Debtor, entered into a certain Loan and Security
Agreement dated February 22, 1996 and Supplemental Security Agreement No. One,
thereto dated February 22, 1996 (the "LSA") with MetLife Capital Corporation, a
Delaware corporation ("MetLife"), as secured party/payee, whereby Assignor
granted to MetLife a security interest in certain collateral more specifically
described in the Supplemental Security Agreement No. One (the "Collateral")
attached hereto as part of Exhibit "A"; and

         WHEREAS, pursuant to such LSA, MetLife made a loan to Assignor and
Assignor executed a certain Term Promissory Note dated March 14, 1996 in the
original principal amount of $433,000.00 ("Note") payable to MetLife to
evidence its obligation to MetLife and to set forth the terms of repayment.
The LSA and the Note are sometimes collectively referred to herein as the
"Loan."  (Copies of the Loan and Security Agreement, Supplemental Security
Agreement No. One and the Note are attached hereto and made a part hereof as
EXHIBIT "A"); and

         WHEREAS, Assignor has assigned or now wishes to assign to Assignee all
of Assignor's right, title and interest in and to the Collateral; and

         WHEREAS, Assignor desires to assign its rights and obligations under
the Loan to Assignee, and Assignee desires to accept such assignment and to
assume Assignor's obligations under the Loan; and

         WHEREAS, the Loan provides that MetLife's prior consent is required
for the effectiveness and enforceability of any such assignment and assumption;
and

         WHEREAS, MetLife is willing to give such consent provided that the
parties enter into the covenants and make the representations and warranties
set forth in this Agreement;

         NOW THEREFORE, for good and valuable consideration the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:
<PAGE>   2
         1.      Defined Terms.  Terms used in this Agreement are, unless
otherwise defined herein, used as defined in the Loan.

         2.      Assignment and Assumption.  Assignor hereby sells, assigns,
transfers and sets over unto Assignee and unto Assignee's successors and
assigns, all right, title, interest and obligations of Assignor under, in and
to the Collateral and the Loan.  Assignee hereby accepts such assignment, and
hereby assumes, and covenants with Assignor and MetLife to perform fully, all
the duties of the Assignor under the Loan.  It is expressly understood and
agreed that Assignee assumes all such obligations notwithstanding the fact that
some of such obligations may have accrued prior to the date hereof.

         3.      Security Interest.  Assignee acknowledges and agrees that it
acquires the Collateral subject to MetLife's prior security interest.  As
security for the obligations referred to in this Agreement, including but not
limited to the Notes, now existing or hereafter arising, Assignee hereby
conveys, warrants, mortgages, assigns, pledges and grants to MetLife, its
successors and assigns, a security interest in all of Assignee's right, title
and interest in and to the properties, rights, interests, and privileges in the
Collateral.

         4.      Representations and Warranties of Assignor and Assignee.
Assignor and Assignee represent and warrant individually and respectively, as
applicable, to MetLife as follows:

                 a.       The Assignee is a corporation duly organized and
         validly existing in good standing under the laws of the State of
         Delaware and has the power and authority to enter into and perform its
         obligations under this Agreement;

                 b.       The execution, delivery and performance of this
         Agreement has been duly authorized by all necessary action on the part
         of the Assignee and the Assignor, does not require any stockholder
         approval, or approval or consent of any general or limited partner,
         trustee or holders of any indebtedness or obligations of the Assignee
         or Assignor except such as have been duly obtained and does not and
         will not contravene any law, judgment, governmental rule, regulation
         or order applicable to or binding on the Assignee or Assignor or any
         of their subsidiaries or the certificates of incorporation or bylaws
         of the Assignee or Assignor or any of their subsidiaries or contravene
         the provisions of, or constitute a default under, or result in the
         creation of any lien (other than as permitted under the Loan) upon the
         property of the Assignee or Assignor under any indenture, mortgage,
         chattel mortgage, deed of trust, conditional sales contract, bank loan
         or agreement or instrument, or other contract or agreement to which
         the Assignee or Assignor or any of their subsidiaries





                                     - 2 -
<PAGE>   3
         are a party or by which they or any of their subsidiaries may be bound
         or affected;

                 c.       This Agreement constitutes the legal, valid and
         binding obligation of Assignee and Assignor enforceable against said
         parties in accordance with its terms;

                 d.       Except for the filings and recordings consummated at
         the time of execution of the Loan and except for the filing and
         recording of this Agreement, no further action, including any filing
         or recording of any document, is necessary or advisable in order to
         establish and protect MetLife's interest in the Collateral as against
         the Assignee, the Assignor, and any third parties in any applicable
         jurisdictions in the United States.

         5.      Assignor's Continuing Obligation and Guaranty.  Assignor
covenants with MetLife that notwithstanding its assignment of the Loan to the
Assignee, Assignor will duly and punctually perform and observe each and every
obligation, covenant, representation, warranty and agreement to be performed
and observed by the Debtor under the provisions of the Loan, notwithstanding
the fact that Assignee is similarly obligated by the terms of this Agreement to
perform or observe those obligations, covenants, representations or warranties
of Debtor arising pursuant to the terms of the Loan; provided, however, that
Assignor shall have no obligation hereunder to make any payment to MetLife
required by any Loan provision to the extent that Assignee has satisfied the
obligations of the Debtor arising pursuant to such Loan provision.  Except as
expressly set forth in the preceding sentence, Assignor is not released in any
respect from its obligations to MetLife arising under the Loan or related
documents.  The Assignor hereby acknowledges and consents that MetLife may
agree with the Assignee to extend the time for making payments for any or all
of the amounts due or to become due under the Loan and documents executed in
conjunction therewith or that the Loan and documents in conjunction therewith
may be changed in any manner at the option of said Assignee and without
Assignor's consent and that Assignor's obligation to perform in accordance with
this Paragraph 5 shall extend to such agreements as changed in the same manner
as if such changes had been part of the agreements as originally executed and
delivered.

         Assignor hereby absolutely and unconditionally guarantees to MetLife
the full and timely performance by Assignee of all obligations whatsoever which
the Assignee has incurred or is under or which the Assignee may at any time
incur or be under to MetLife pursuant to or in connection with any of the
transactions contemplated by the Loan and this Agreement; including but not
limited to all obligations of the Assignee for the payment of money whether by
reason of covenant, indemnity, breach of warranty or otherwise.  MetLife shall
not be bound to exhaust its recourse nor





                                     - 3 -
<PAGE>   4
to take any other action against the Assignee or other parties or on any
Collateral it may hold before being entitled to payment by Assignor of all
amounts hereby guaranteed.  Assignor specifically agrees that it shall not be
necessary or required in order to enforce the obligations of the Assignor
hereunder that there be, and specifically waives: notice of performance or
nonperformance of the Loan; demand of payment from the Assignee; presentment
for payment upon Assignee or the making of any protest; notice of the amount of
guaranteed obligations outstanding at any time; notice of nonpayment or failure
to perform on the part of the Assignee; and any other circumstances which might
otherwise constitute a legal or equitable defense or discharge of a guarantor.

         6.      Financial Data.  During the term of this Agreement, Assignee
will furnish to MetLife and will cause any guarantor of Assignee's obligations
to furnish to MetLife on request (i) annual balance sheet and profit and loss
statements prepared in accordance with generally accepted accounting principles
and practices consistently applied and, if MetLife so requires, accompanied by
the annual audit report of an independent certified public accountant
reasonably acceptable to MetLife, and (ii) all other financial information and
reports that MetLife may from time to time reasonably request, including, if
MetLife so requires, income tax returns of Assignee and any guarantor of
Assignee's obligations hereunder.

         Assignee shall, from time to time, furnish all such information as
MetLife may reasonably request concerning Assignee and its affairs and shall
execute and deliver such documents and perform all such other acts that MetLife
may reasonably request in order to carry out any transactions contemplated by
this Agreement.

         7.      Miscellaneous.

                 a.       The representations, warranties and agreements made
         herein shall survive the execution and delivery of this Agreement or
         any other agreements or documents executed in connection herewith, and
         the performance of this Agreement.

                 b.       This Agreement shall be binding upon, and inure to
         the benefit of the parties hereto and their respective successors and
         assigns.

                 c.       Neither Assignor nor Assignee may assign or transfer
         any rights under this Agreement without MetLife's prior written
         consent.

                 d.       This Agreement shall be governed by and construed
         according to the laws of the State of Washington.

                 e.       This Agreement shall not be altered or amended except
         by an agreement in writing signed by the parties hereto





                                     - 4 -
<PAGE>   5
         or their successors or assigns, and may not be altered or amended
         without the express written consent of MetLife.

                 f.       This Agreement constitutes the entire agreement
         between the parties relating to the assignment from Assignor to
         Assignee of the Assignor's rights and obligations under the Loan or in
         the Collateral, superseding all prior agreements between the parties.

         8.      Counterparts.

         This Agreement may be signed in any number of counterparts required
for the convenience of the parties, all of which when taken together shall form
one and the same Agreement.


IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the
day and year first above written.



ASSIGNOR:                                  ASSIGNEE:
SEITEL GEOPHYSICAL, INC.                   EAGLE GEOPHYSICAL, INC.



By: Jay N. Silverman                       By: /s/ Jay N. Silverman
Its: President                             Its: President


By: /s/ [illegible signature]              By: /s/ [illegible signature]
Its: Assistant Secretary                   Its: Assistant Secretary





                               CONSENT OF METLIFE

On the terms and conditions set forth above, MetLife Capital Corporation hereby
consents to the assignment by SEITEL GEOPHYSICAL, Inc. of its rights and
obligations under the Loan described above to EAGLE GEOPHYSICAL, INC. dated
this 30th day of December, 1996.




                                                   METLIFE CAPITAL CORPORATION



                                                   By: /s/ Judy Johnston
                                                   Its: Vice President





                                     - 5 -
<PAGE>   6
                                  Exhibit "A"


                          LOAN AND SECURITY AGREEMENT


THIS LOAN AND SECURITY AGREEMENT entered into as of the 22nd day of February,
1996 by and between MetLife Capital Corporation, a Delaware corporation, whose
address is 10900 NE 4th, Suite #500, Bellevue, WA 98004 ("Lender") and Seitel
Geophysical, Inc., a Delaware corporation whose address is 50 Briar Hollow
Lane, West Building, 7th Floor, Houston, TX 77027 ("Borrower").

         WHEREAS, Lender has agreed to make a commercial loan or loans to
Borrower; and

         WHEREAS, as a condition to making the loans, and in order to secure
the repayment thereof, Lender has required Borrower to execute and deliver to
Lender this Loan and Security Agreement.

         NOW THEREFORE, for good and valuable consideration, the receipt and
adequacy of which are hereby acknowledged, Borrower and Lender agree as
follows:

         1.      Creation of Security Interest.  As security for the due and
punctual payment of any and all of the present and future obligations of the
Borrower to Lender, whether direct or contingent or joint or several, Borrower
hereby conveys, assigns and grants to Lender a continuing security interest in
all of Borrower's rights, title and interests in and to the equipment described
in the Supplemental Security Agreement(s) entered into pursuant to this Loan
and Security Agreement from time to time ("Equipment") including all present
and future additions, attachments and accessories thereto, all substitutions
therefor and replacements thereof and all proceeds thereof, including all
proceeds of insurance (such Equipment and property hereinafter called
"Collateral").

         2.      The Loans.  (a) Subject to the terms and conditions of this
Loan and Security Agreement, Lender agrees to make a loan or loans to Borrower.
The maximum principal amount of any loan or loans to be made by Lender to
Borrower shall be within Lender's discretion, subject to the exercise of
Lender's reasonable business judgment, and shall be as stated in the loan
commitment letter issued by Lender to Borrower, or in the event a commitment
letter is not issued by Lender, in Lender's internal credit approval (each such
loan or loans shall be referred to as "the Loan Amount").

                 (b)      The Loan Amount shall be repaid by Borrower as a term
                          loan or term loans ("Term Loan"). The Term Loan shall
                          be evidenced by a promissory note or notes in the
                          form attached hereto as Exhibit "A" ("Term Note").
                          The payment provisions of each Term Note shall be
                          stated therein.
<PAGE>   7
                 (c)      If requested by Borrower, and in accordance with the
                          terms and conditions of Section 3 hereof, Lender
                          shall make interim fundings to Borrower of a Term
                          Loan as partial advances of the Loan Amount ("Interim
                          Loans").  The Interim Loans shall either be for the
                          payment of the acquisition cost of any items of
                          Equipment delivered and accepted by Borrower prior to
                          the expiration date of Lender's loan commitment to
                          Borrower ("Commitment Expiration Date") or to fund
                          progress payments to the vendor or manufacturer of
                          the Equipment, if the making of progress payments was
                          agreed to by Lender in its commitment or approval to
                          make the loan or loans to Borrower.  The Interim
                          Loans shall be evidenced by promissory notes in the
                          form attached hereto as Exhibit "B" ("Interim Note").
                          Interest on all Interim Loans shall be payable as
                          provided therein. The principal amount due under the
                          Interim Loans shall be due as provided in the Interim
                          Notes, at which time, provided no Event of Default
                          hereunder has occurred and is continuing or event
                          which with the passing of time or giving of notice or
                          both would become an Event of Default hereunder has
                          occurred and is continuing, Lender shall consolidate
                          all Interim Loans and convert them to a Term Loan
                          evidenced by a Term Note or Notes.  Whether or not a
                          Term Loan is evidenced by one or more Term Notes
                          shall be as agreed between Lender and Borrower, or in
                          the absence of such an agreement, as decided by
                          Lender, in the exercise of its reasonable business
                          judgment.

                 (d)      In the event that the amount loaned pursuant to the
                          Interim Loans is less than the Loan Amount, subject
                          to Borrower's compliance with the terms and
                          conditions of this Loan and Security Agreement
                          (including the satisfaction of the conditions of
                          borrowing set forth in Section 7 of this Loan and
                          Security Agreement, including but not limited to
                          providing Lender with a description of the items of
                          Equipment), Lender shall disburse to Borrower the
                          balance of the Loan Amount on the same date that the
                          Interim Loans are convened into a term loan.

         3.      Method For Borrowing On Interim Loan.  Borrower shall give
Lender at least five (5) business days written notice of a request for the
disbursement of an Interim Loan ("Request"), specifying the date on which the
Interim Loan is to be disbursed. Such Request shall be in the form attached
hereto as Exhibit "C". Such Request shall be accompanied by an original copy of
the invoice or invoices to be paid from the Interim Loan.  Such Request shall
constitute a representation and warranty by the Borrower that





                                     - 7 -
<PAGE>   8
(i) as of the date of the Request no Event of Default or event which with the
passing of time or the giving of notice or both would constitute an Event of
Default hereunder has occurred and is continuing and (ii) in the event items of
Equipment have been delivered to the Borrower, Borrower has unconditionally
accepted the Equipment from the vendor thereof.  Subject to the conditions of
this Loan and Security Agreement, Lender shall disburse the Interim Loan to the
invoicing party, or if Borrower shall have paid the amount of such invoice,
Lender shall reimburse Borrower, upon receipt of proof of payment from
Borrower.

         4.      Cross Collateral/Cross Default.  All Collateral shall secure
the payment and performance of all of Borrower's liabilities and obligations to
Lender hereunder and under any of the loan documents relating hereto including,
but not limited to, all Interim Notes and all Term Notes (the Loan and Security
Agreement, the interim Notes, the Term Notes, the Supplemental Security
Agreement(s) and all other loan documents may be referred to herein
collectively as the "Loan Documents").  Lender's security interest in the
Collateral shall not be terminated until and unless all of Borrower's
obligations to Lender under any of the Loan Documents are fully paid and
performed.  The occurrence of an event of default under any other of the Loan
Documents shall be deemed to be an Event of Default hereunder and an Event of
Default hereunder shall be deemed to be an event of default under any other of
the Loan Documents.

         5.      Representations And Warranties.  Borrower hereby represents
and warrants as follows:

                 (a)      Power and Authorization.  Borrower has the full power
                          and (corporate) authority to execute, deliver and
                          perform Borrower's obligations under the Loan
                          Documents.  The execution and delivery of the Loan
                          Documents have been authorized by all requisite
                          corporate (or partnership) action on the part of
                          Borrower.  The execution, delivery and performance of
                          the Loan Documents have not constituted and will not
                          constitute a breach, default, or violation of or
                          under Borrower's articles of incorporation, by-laws
                          (partnership agreement), or any other agreement,
                          indenture, contract, lease, law, order, decree,
                          judgment, or injunction to which Borrower is a party
                          or may be bound and have not resulted and will not
                          result in the creation of any lien upon the Equipment
                          pursuant to any agreement, indenture, lease, contract
                          or other instrument to which Borrower is a party,
                          except the lien created by this Loan and Security
                          Agreement.

                 (b)      Existence.  If Borrower is a corporation, Borrower
                          (i) is duly incorporated, validly existing and in





                                     - 8 -
<PAGE>   9
                          good standing under the laws of its state of
                          incorporation, (ii) has all corporate powers and all
                          governmental licenses, authorizations, consents and
                          approvals required to carry on its business as now
                          conducted, and (iii) is duly qualified to transact
                          business as a foreign corporation in each
                          jurisdiction where the Equipment will be located and
                          in the jurisdiction where its principal place of
                          business is located.  If Borrower is a partnership,
                          Borrower (i) has been duly formed as a (limited or
                          general) partnership under the laws of the state of
                          its organization, (ii) is comprised of the general
                          partner(s) listed on the Schedule of Partners
                          attached to this Loan and Security Agreement, and
                          (iii) is in good standing under the laws of the state
                          of its formation.

                 (c)      Binding Effect.  This Loan and Security Agreement
                          constitutes the valid and binding agreement of the
                          Borrower; the Interim Notes and the Term Note, when
                          executed and delivered, will constitute the valid and
                          binding obligations of the Borrower; and the Loan
                          Documents are enforceable in accordance with their
                          terms except as (i) the enforceability thereof may be
                          limited by the bankruptcy laws, and (ii) rights of
                          acceleration and the availability of equitable
                          remedies may be limited by equitable principles of
                          general applicability.

                 (d)      Litigation.  There is no action, suit or proceeding
                          pending against, or to the knowledge of the Borrower,
                          threatened against or affecting the Borrower, before
                          any court or arbitrator or any governmental body,
                          agency or official which has not been previously
                          disclosed to the Lender in writing and in which there
                          is a reasonable possibility of an adverse decision
                          which could materially adversely affect the business,
                          financial condition or results of operations of the
                          Borrower or which would in any manner draw into
                          question the validity of any of the Loan Documents.

                 (e)      Filing of Tax Returns.  The Borrower has filed all
                          tax returns required to have been filed and has paid
                          all taxes shown to be due and payable on such
                          returns, including interest and penalties, and all
                          other taxes which are payable by it, to the extent
                          the same have become due and payable.  The Borrower
                          knows of no proposed tax assessment against it and
                          all tax liabilities of the Borrower are adequately
                          provided for.





                                     - 9 -
<PAGE>   10
                 (f)      Title.  The Borrower has or shall have at the time it
                          executes the Term Note good and indefeasible title to
                          the Collateral free and clear of all liens other than
                          the Lender's lien.

                 (g)      Compliance with Law.  The business and operations of
                          the Borrower have been and are being conducted in
                          accordance with all applicable laws, rules and
                          regulations, other than violations which could not
                          (either individually or collectively) have a material
                          adverse effect on the financial condition or
                          operations of the Borrower.

                 (h)      Full Disclosure.  All documents, records,
                          instruments, certificates, statements (including, but
                          not by way of limitation, financial statements of
                          Borrower) and information provided to Lender by
                          Borrower in connection with this Loan and Security
                          Agreement are true and accurate in all material
                          respects and do not contain any untrue statement, or
                          fail to contain any statement of a material fact
                          necessary to make the statements contained herein or
                          therein not misleading.  There is no fact known to
                          the Borrower that Borrower has not disclosed in
                          writing which could materially and adversely affect
                          the financial condition or operations of Borrower.

                 (i)      Security Interest.  The security interest granted to
                          Lender hereunder is a valid, first priority security
                          interest in the Collateral and has been or promptly
                          after the execution of the Supplemental Security
                          Agreement describing the Collateral will be,
                          perfected in accordance with the requirements of all
                          states in which any item of the Collateral is
                          located.

                 (j)      Personal Property.  Under the laws of the state(s) in
                          which the Collateral is to be located, the Collateral
                          is deemed to consist solely of personal property.

                 (k)      Pollution and Environmental Control.  Borrower has
                          obtained all permits, licenses and other
                          authorizations which are required under, and is in
                          material compliance with, all federal, state, and
                          local laws and regulations relating to pollution,
                          reclamation, or protection of the environment,
                          including laws relating to emissions, discharges,
                          releases or threatened releases of pollutants,
                          contaminants, or hazardous or toxic materials or
                          wastes into air, water, or land, or otherwise
                          relating to the manufacture, processing,





                                     - 10 -
<PAGE>   11
                          distribution, use, treatment, storage, disposal,
                          transport, or handling of pollutants, contaminants or
                          hazardous or toxic materials or wastes.  Borrower
                          shall maintain all such permits, licenses, and
                          authorizations current.

         6.      Covenants.  Borrower hereby agrees and covenants as follows:

                 (a)      Payment.  Borrower shall pay the indebtedness secured
                          hereby as provided herein and in the Interim Notes
                          and Term Notes.

                 (b)      Location of Collateral.  Borrower will keep the
                          Collateral located at the location or locations
                          stated on the Supplemental Security Agreements,
                          provided, however, that Borrower may change the
                          location of the collateral with Lender's prior
                          written consent.

                 (c)      No Liens.  Except for the security interest granted
                          hereby or under any other agreement under which
                          Lender is the secured party, whether as mortgagee,
                          beneficiary or otherwise, Borrower shall keep the
                          Collateral free and clear of any security interest,
                          lien or encumbrance of any kind and Borrower shall
                          not sell, assign (by operation of law or otherwise)
                          exchange or otherwise dispose of any of the
                          Collateral.

                 (d)      Insurance.  Borrower shall procure and continuously
                          maintain and pay for (a) all risk physical damage and
                          property insurance covering loss or damage to the
                          equipment for not less than the full replacement
                          value thereof naming Lender as loss payee and (b)
                          bodily injury and property damage combined single
                          limit liability insurance, all in such amounts and
                          against such risks and hazards as are reasonably
                          required by Lender, with insurance companies and
                          pursuant to contracts or policies held with
                          deductibles satisfactory to Lender.  All contracts
                          and policies shall include provisions for the
                          protection of Lender notwithstanding any act or
                          neglect of or breach or default by Borrower, shall
                          provide for payment of insurance proceeds to Lender
                          shall provide that they may not be modified,
                          terminated or cancelled unless Lender is given at
                          least thirty (30) days' advance written notice
                          thereof, and shall provide that the coverage is
                          "primary coverage" for the protection of Borrower or
                          Lender notwithstanding any other coverage carried by
                          Lender protecting against similar risks.





                                     - 11 -
<PAGE>   12
                          Borrower shall promptly notify any appropriate
                          insurer and Lender of each and every occurrence,
                          which may become the basis of a claim or cause of
                          action against the insured and provide Lender with
                          ail data pertinent to such occurrence.  Borrower
                          shall furnish Lender with certificates of such
                          insurance or copies of policies upon request and
                          shall furnish Lender with renewal certificates not
                          less than thirty (30) days prior to the renewal date.
                          Proceeds of all insurance are payable first to Lender
                          to the extent of its interest.

                 (e)      Financing Statements.  At the request of Lender,
                          Borrower will join Lender in executing one or more
                          financing statements pursuant to the Uniform
                          Commercial Code and other documents deemed necessary
                          by Lender under applicable law to record or perfect
                          its security interest in the Collateral, including
                          continuation statements, in form satisfactory to
                          Lender and will pay the cost of filing the same in
                          all public offices wherever filing is deemed by
                          Lender to be necessary or desirable.  Borrower hereby
                          authorizes Lender, in such jurisdictions where such
                          action is authorized by law, to effect any such
                          recordation or filing of financing statements or
                          other documents without Borrower's signature thereto.

                 (f)      Change of Name or Address.  Borrower will immediately
                          notify Lender in writing of any change in its place
                          of business or the adoption or change of any
                          tradename or fictitious business name, and will upon
                          request of Lender, execute any additional financing
                          statements or other similar documents necessary to
                          perfect or maintain its security interest.

                 (g)      Use of Equipment, Maintenance.  Borrower will cause
                          the Equipment to be used in a careful and proper
                          manner, will comply with and conform to all
                          governmental laws, rules and regulations relating
                          thereto, and will cause the Equipment to be operated
                          in accordance with the manufacturer's or supplier's
                          instructions or manuals and only by competent and
                          duly qualified personnel.  Borrower will cause the
                          Equipment to be kept and maintained in good repair,
                          condition and working order and will furnish all
                          pans, replacements, mechanisms, devices and servicing
                          required therefor so that the value, condition and
                          operating efficiency thereof will at all times be
                          maintained and preserved, normal wear and tear
                          excepted.  All such repairs,





                                     - 12 -
<PAGE>   13
                          pans, mechanisms, devices and replacements shall
                          immediately, without further act, become part of the
                          Equipment and subject to the security interest
                          created by this Loan and Security Agreement.
                          Borrower will not make any improvement, change,
                          addition or alteration to the Equipment if such
                          improvement, change, addition or alteration will
                          impair the originally intended function or use of the
                          Equipment or impair the value of the Equipment as it
                          existed immediately prior to such improvement,
                          change, addition or alteration.  Any part added to
                          the Equipment in connection with any improvement,
                          change, addition or alteration shall immediately,
                          without further act, become part of the Equipment and
                          subject to the security interest created by this Loan
                          and Security Agreement.

                 (h)      Inspection.  Lender may at any reasonable time or
                          times inspect the Equipment and may at any reasonable
                          time or times inspect the books and records of
                          Borrower.

                 (i)      Taxes.  Borrower shall promptly pay, when due, all
                          charges, fees, assessments and taxes (excluding all
                          taxes measured by Lender's income) which may now or
                          hereafter be imposed upon the ownership, leasing,
                          possession, sale or use of the Collateral.

                 (j)      Performance by Lender.  If Borrower fails to perform
                          any agreement or obligation contained herein, Lender
                          may itself perform, or cause the performance of such
                          agreement or obligation.  Borrower will pay, or
                          reimburse Lender, on demand, for any and all fees,
                          including attorneys' fees, costs and expenses of
                          whatever kind or nature incurred by Lender in
                          connection with (i) the creation, preservation and
                          protection of Lender's security interest in the
                          Collateral, including, without limitation, all fees
                          and taxes in connection with the recording or filing
                          of instruments and documents in public offices, (ii)
                          payments or discharge of any taxes or liens upon or
                          in respect of the Collateral, (iii) premiums for
                          insurance with respect to the Equipment and (iv) this
                          Loan and Security Agreement and with protecting,
                          maintaining or preserving the Collateral and Lender's
                          interests therein, whether through judicial
                          proceedings or otherwise, or in connection with
                          defending or prosecuting any actions, suits or
                          proceedings arising out of or related to the Loan and
                          Security Agreement and the Loan Documents or in
                          connection with any debt





                                     - 13 -
<PAGE>   14
                          restructuring, loan workout negotiations or
                          bankruptcy or insolvency case or proceedings.  All
                          such amounts shall constitute obligations of Borrower
                          secured by the Collateral.  In the event that
                          Borrower fails to perform any of its agreements
                          contained herein, Borrower will, on demand, reimburse
                          Lender for all such expenditures, together with
                          interest thereon from the date of such expenditure
                          until fully reimbursed at the rate of two percent
                          (2%) per month on the outstanding balance of such
                          expenditures or the highest rate permitted by law,
                          whichever is less.

                 (k)      Power of Attorney.  Borrower hereby irrevocably
                          appoints Lender Borrower's attorney-in-fact, with
                          full authority in the place and stead of Borrower and
                          in the name of Borrower or otherwise, from time to
                          time in the Lender's discretion, to take any action
                          and to execute any instrument which Lender may deem
                          necessary or advisable to accomplish the purposes of
                          this Loan and Security Agreement, including, without
                          limitation:  (i) to obtain, compromise and adjust
                          insurance required to be paid to Lender; (ii) to ask,
                          demand, collect, sue for, recover, receive, and give
                          acquittance and receipts for moneys due and to become
                          due under or in respect of any of the Collateral;
                          (iii) to receive, endorse, and collect any drafts or
                          other instruments, documents, and chattel paper in
                          connection with clause (i) or (ii) above; and (iv) to
                          file any claims or take any action or institute any
                          proceedings which Lender may deem necessary or
                          desirable for the collection of any of the Collateral
                          or otherwise to enforce the rights of Lender with
                          respect to any of the Collateral.

                 (l)      No Duties.  The powers conferred on Lender hereunder
                          are solely to protect its interest in the Collateral
                          and shall not impose any duty upon it to exercise any
                          such powers.  Except for the safe custody of any
                          Collateral in its possession and the accounting for
                          moneys actually received by it hereunder, Lender
                          shall have no duty as to any Collateral or as to the
                          taking of any necessary steps to preserve rights
                          against prior parties or any other rights pertaining
                          to any Collateral.

                 (m)      Financial Data.  Borrower will furnish to Lender and
                          will cause any guarantor of Borrower's obligations to
                          furnish to Lender on request (i) annual balance sheet
                          and profit and loss statements prepared in accordance
                          with generally accepted





                                     - 14 -
<PAGE>   15
                          accounting principles and practices consistently
                          applied and, if Lender so requires, accompanied by
                          the annual audit report of an independent certified
                          public accountant reasonably acceptable to Lender,
                          and (ii) all other financial information and reports
                          that Lender may from time to time reasonably request,
                          including, if Lender so requires, income tax returns
                          of Borrower and any guarantor of Borrower's
                          obligations hereunder.

         7.      Conditions of Borrowing.  Lender shall not be obligated to
make any loan hereunder unless:

                 (a)      The Interim Notes or Term Notes evidencing such loan
                          shall have been duly executed and delivered to
                          Lender;

                 (b)      Borrower shall have executed and delivered to Lender
                          the Supplemental Security Agreement describing the
                          Collateral and stating, except with respect to
                          progress payment fundings, the location thereof;

                 (c)      Except with respect to progress payment fundings,
                          Lender shall have received evidence (as described in
                          Section 6d hereof) that insurance has been obtained
                          in accordance with the provisions of this Loan and
                          Security Agreement;

                 (d)      Lender shall have received any and all third party
                          consents, waivers or releases deemed necessary or
                          desirable by it in connection with the loan and the
                          Collateral being financed, including, without
                          limitation, Uniform Commercial Code lien releases and
                          the consent and waiver, in form and substance
                          satisfactory to Lender, of each and every realty
                          owner, landlord and mortgagee holding an interest in
                          or encumbrance on the real property where any of the
                          Collateral is to be located;

                 (e)      All filings, recordings and other actions deemed
                          necessary or desirable by Lender in order to
                          establish, protect, preserve and perfect its security
                          interest in the Collateral being financed by such
                          loan as a valid perfected first priority security
                          interest shall have been duly effected, including,
                          without limitation, the filing of financing
                          statements and the recordation of landlord (owners)
                          and/or mortgagee waivers or disclaimers, all in form
                          and substance satisfactory to Lender, and all fees,
                          taxes and other charges





                                     - 15 -
<PAGE>   16
                          relating to such filings and recordings shall have
                          been paid by Borrower;

                 (f)      The representations and warranties contained in this
                          Loan and Security Agreement shall be true and correct
                          in all respects on and as of the date of the making
                          of any loan hereunder with the same effect as if made
                          on and as of such date;

                 (g)      In the sole judgment of Lender, there shall have been
                          no material adverse change in the financial
                          condition, business or operations of Borrower from
                          the earliest date of any financial statement, credit
                          report, business report or similar document submitted
                          to Lender for its review;

                 (h)      All Loan Documents shall be satisfactory to Lender's
                          attorneys; and

                 (i)      Lender shall have received, in form and substance
                          satisfactory to Lender, such other documents as
                          Lender shall require including, but not limited to a
                          Request, proof of payment, vendor invoices and
                          certificates of authority and incumbency.

         8.      Default.  The occurrence of any of the following events,
following the giving of any required notice and/or the expiration of any
applicable period of grace, shall constitute an event of default ("Event of
Default") hereunder:

                 (a)      Borrower's default in payment of any installment of
                          the principal of or interest on any Interim Note or
                          Term Note when and after the same shall become due
                          and payable, whether at the due date thereof or by
                          acceleration or otherwise, which default shall
                          continue unremedied for ten (10) days; or

                 (b)      The failure by Borrower to make payment of any other
                          amount payable hereunder or under any Interim Note or
                          Term Note, and the continuance of such failure for
                          more than ten (10) days after written notice thereof
                          by Lender to Borrower; or

                 (c)      The failure by Borrower to perform or observe any
                          covenant, condition, obligation or agreement to be
                          performed or observed by it hereunder, which failure
                          shall continue unremedied for thirty (30) days after
                          written notice thereof by Lender to Borrower; or

                 (d)      The occurrence of a default described in Section 4
                          hereof; or





                                     - 16 -
<PAGE>   17
                 (e)      Any warranty, representation or statement made or
                          furnished with respect to the Borrower or the
                          Collateral to Lender by or on behalf of Borrower, in
                          connection with this Loan and Security Agreement, or
                          the indebtedness secured hereby, shall prove to have
                          been false in any adverse, material respect when made
                          or furnished; or

                 (f)      Borrower shall become insolvent or bankrupt or make
                          an assignment for the benefit of creditors or consent
                          to the appointment of a trustee or receiver; or a
                          trustee or a receiver shall be appointed for Borrower
                          or for a substantial pan of its property without its
                          consent and shall not be dismissed for a period of
                          sixty (60) days; or bankruptcy, reorganization,
                          liquidation, insolvency or dissolution proceedings
                          shall be instituted by or against Borrower and, if
                          instituted against Borrower, shall be consented to or
                          be pending and not dismissed for a period of sixty
                          (60) days; or any execution or writ of process shall
                          be issued under any action or proceeding against
                          Borrower in such capacity whereby any of the
                          Collateral may be taken or restrained; Borrower shall
                          cease doing business as a going concern; or, without
                          the prior written consent of Lender, Borrower shall
                          sell, transfer or dispose of all or substantially all
                          of its assets or property; or

                 (g)      The liquidation, merger, consolidation, 
                          reorganization, conversion to an "S" status or
                          dissolution, if Borrower is a corporation or
                          partnership, of Borrower, if in Lender's reasonable
                          opinion, such act shall materially and adversely
                          affect Borrower's ability to perform under any of the
                          Loan Documents; or

                 (h)      Any item of Collateral is seized or levied on under
                          legal or governmental process or for any reason
                          Lender deems itself insecure.  Lender shall be
                          entitled to deem itself insecure when some event
                          occurs, fails to occur or is threatened or some
                          objective condition exists or is threatened which
                          significantly impairs the prospects that any of
                          Borrower's obligations to Lender will be paid when
                          due, which significantly impairs the value of the
                          Collateral to Lender or which significantly affects
                          the financial or business condition of Borrower.

                                  The occurrence of an Event of Default shall
                          terminate any commitment or obligation by Lender to





                                     - 17 -
<PAGE>   18
                          make any of the loans contemplated by this Loan and 
                          Security Agreement.

         9.      Remedies Upon Default.  Upon the occurrence of an Event of
Default hereunder, Lender may, at its option, do any one or more of the
following:

                 (a)      Declare all obligations of Borrower to Lender to be
                          immediately due and payable, whereupon all unpaid
                          principal of and interest on said indebtedness and
                          other amounts declared due and payable shall be and
                          become immediately due and payable;

                 (b)      Take possession of all or any of the Collateral and
                          exclude therefrom Borrower and all others claiming
                          under Borrower, and thereafter hold, store, use,
                          operate, manage, maintain and control, make repairs,
                          replacements, alterations, additions and improvements
                          to and exercise all rights and powers of Borrower in
                          respect to the Collateral or any pan thereof.  In the
                          event Lender demands, or attempts to take possession
                          of the Collateral in the exercise of any rights under
                          this Loan and Security Agreement, Borrower promises
                          and agrees to promptly turn over and deliver complete
                          possession thereof to Lender;

                 (c)      Require Borrower to assemble the Collateral, or any
                          portion thereof, at a place designated by Lender and
                          reasonably convenient to both parties, and promptly
                          to deliver such Collateral to Lender, or an agent or
                          representative designated by it;

                 (d)      Sell, lease or otherwise dispose of the Collateral at
                          public or private sale, without having the Collateral
                          at the place of sale, and upon terms and in such
                          manner as Lender may determine (and Lender may be a
                          purchaser at any sale); and

                 (e)      Exercise any remedies of a secured party under the
                          Uniform Commercial Code as adopted in the state where
                          the Collateral is located or any other applicable
                          law.

                                  Except as to portions of the Collateral which
                          are perishable or threaten to decline speedily in
                          value or are of a type customarily sold on a
                          recognized market, Lender shall give Borrower at
                          least ten (10) days' prior written notice of the time
                          and place of any public or private sale of the
                          Collateral or other intended disposition thereof to
                          be made.  Such notice may be mailed to Borrower at





                                     - 18 -
<PAGE>   19
                          the address set forth in the first paragraph of this
                          Loan and Security Agreement.  Borrower hereby
                          specifically agrees (to the extent that applicable
                          law and public policy allows it to effectively do so)
                          that any public or private sale held in accordance
                          with the terms of this Loan and Security Agreement
                          shall, for the purpose of the Uniform Commercial Code
                          as adopted in the state where the Collateral is
                          located and for all other purposes, be deemed to have
                          been conducted in a commercially reasonable manner
                          and in good faith.

                                  The proceeds of any sale under Section 9(d) 
                          shall be applied as follows:

                               (i)         To the repayment of the costs and
                                           expenses of retaking, holding and
                                           preparing for the sale and the
                                           selling of the Collateral (including
                                           legal expenses and attorneys' fees)
                                           and the discharge of all
                                           assessments, encumbrances, charges
                                           or liens, if any, on the Collateral
                                           prior to the lien hereof (except any
                                           taxes, assessments, encumbrances,
                                           charges or liens subject to which
                                           such sale shall have been made);

                              (ii)         To the payment of the whole amount
                                           then due and unpaid of the
                                           indebtedness of Borrower to Lender;

                              (iii)        To the payment of other amounts then
                                           secured hereunder; and

                              (iv)         The surplus, if any shall be paid to
                                           the Borrower or to whomsoever may be
                                           lawfully entitled to receive the
                                           same.

                                  Lender shall have the right to enforce one or
                          more remedies hereunder, successively or
                          concurrently, and such action shall not operate to
                          estop or prevent Lender from pursuing any funkier
                          remedy which it may have, and any repossession or
                          retaking or sale of the Collateral pursuant to the
                          terms hereof shall not operate to release Borrower
                          until full payment of any deficiency has been made in
                          cash.

         10.     Limitation on Interest.  It is the intent of the parties to
this Loan and Security Agreement to contract in strict compliance with
applicable usury laws from time to time in effect.  In furtherance thereof, the
parties stipulate and agree that none





                                     - 19 -
<PAGE>   20
of the terms and provisions contained in the Loan Documents shall ever be
construed to create a contract to pay for the use, forbearance or detention of
money at a rate in excess of the maximum interest rate permitted to be charged
by applicable law from time to time in effect.

         11.     Personal Property/Tags.  No item of Equipment will be attached
or affixed to realty or any building without Lender's prior knowledge and
written consent and waiver of the landlord and the mortgagee, if any, of the
real property.  If so requested by Lender, Borrower will affix tags supplied by
Lender, reflecting Lender's security interest in the Equipment.

         12.     Loss and Damage.  Borrower shall bear the risk of damage,
loss, theft, or destruction, partial or complete of the Equipment, whether or
not such loss or damage is covered by insurance, except that while Borrower is
not in default, Lender agrees to apply toward payment of obligations of
Borrower insurance proceeds payable to Lender by reason of such damage, loss,
theft, or destruction.  In the event of any damage, loss, theft, or
destruction, partial or complete, of any item of Equipment, Borrower shall
promptly notify Lender in writing and at the option of Lender (a) repair or
restore the Equipment to good condition and working order, or (b) replace the
Equipment with similar equipment in good repair, condition and working order,
or (c) pay Lender, in cash, an amount equal to the unamortized equipment cost
for the item or if the Equipment was not purchased with the loan proceeds, the
pro rata portion of the outstanding principal balance due under the Interim
Note or Term Note, as the case may be, and all other amounts relating to that
item of Equipment then due and owing hereunder, and upon payment of that
amount, Lender's lien shall be terminated with respect to that item of
Equipment only and Lender will release its interest in that item of Equipment.

         13.     Assignment.  Borrower may not assign or transfer any rights
under this Loan and Security Agreement or to the Collateral without Lender's
prior written consent.

         14.     Indemnification.  Borrower shall indemnify and hold harmless
Lender from and against any and all claims, losses, liabilities, causes of
action, costs and expenses (including the fees of Lender's attorneys)
("Claims") in any way relating to or arising out of this Loan and Security
Agreement, the other Loan Documents or the Collateral, except for any Claims
resulting solely and directly from Lender's gross negligence or willful
misconduct.

         15.     Notices.  Whenever Borrower or Lender shall desire to give or
serve any notice, demand, request or other communication with respect to this
Loan and Security Agreement, each such notice, demand, request or communication
shall be in writing and shall be effective only if the same is physically
delivered or is by certified mail, postage prepaid, return receipt requested,
or by





                                     - 20 -
<PAGE>   21
overnight courier, postage prepaid, mailed to the parties at the addresses set
forth in the first paragraph of this Loan and Security Agreement, with a copy
to Lender's Vice President of Credit.  Any party hereto may change its address
for such notices by delivering or mailing to the other parties hereto, as
aforesaid, a notice of such change.

         16.     No Waiver by Lender.  By exercising or failing to exercise any
of its rights, options or elections hereunder, Lender shall not be deemed to
have waived any breach or default on the pan of Borrower or to have released
Borrower from any of the obligations secured hereby, unless such waiver or
release is in writing and is signed by Lender.  In addition, the waiver by
Lender of any breach hereof for default in payment of an indebtedness secured
hereby shall not be deemed to constitute a waiver of any succeeding breach or
default.

         17.     Further Agreements.  From time to time, Borrower will execute
such further instruments as Lender may reasonably require, in order to protect,
preserve, and maintain the security interest granted hereby.

         18.     Binding upon Successors.  All agreements, covenants,
conditions and provisions of this Loan and Security Agreement shall apply to
and bind the successors and assigns of all parties hereto.

         19.     Governing Laws.  This Loan and Security Agreement shall be
governed by the laws of the State of Washington.

         20.     Amendment.  This Loan and Security Agreement can be modified
or rescinded only by a writing expressly referring to this Loan and Security
Agreement, signed by both of the parties hereto.

         21.     Invalidity of Provisions.  Every provision of this Loan and
Security Agreement is intended to be severable.  In the event that any term or
provision hereof is declared by a court to be illegal or invalid for any reason
whatsoever, such illegality or invalidity shall not affect the balance of the
terms and provisions hereof, which terms and provisions shall remain binding
and enforceable, then to the extent possible all of the other provisions shall
nonetheless remain in full force and effect.

IN WITNESS WHEREOF, Borrower and Lender have duly executed this Loan and
Security Agreement the day and year first above written.


Lender:                                         Borrower:  
        -----------------------                          --------------------- 
                                                                               
By:                                             By: 
    ---------------------------                    --------------------------- 
                                                                               
(Print Name):                                   (Print Name):   
              -----------------                              -----------------
                                                                               
Title:                                        Title:                           
       ------------------------                     --------------------------





                                     - 21 -
<PAGE>   22
                                                  Social Security Number: ______
                                                  (If Borrower is an Individual)

                                                  Federal Tax Identification
                                                  Number: ______________________





                                     - 22 -
<PAGE>   23
SUPPLEMENTAL SECURITY AGREEMENT NO. ONE
LOAN #2004096-001


         This Supplemental Security Agreement is executed by SEITEL
GEOPHYSICAL, INC. ("Borrower") pursuant to the terms of a Loan and Security
Agreement dated February 22, 1996 between Borrower and MetLife Capital
Corporation ("Lender").  All capitalized terms used herein that are not
otherwise defined herein shall have the respective meanings given to such terms
in the Loan and Security Agreement.

         In order to provide security for the payment and performance of
Borrower's obligations under the Loan Documents, Borrower has granted to Lender
a first priority security interest in the Collateral.  In addition to said
grant, Borrower intends by this Supplemental Security Agreement to grant to
Lender a first priority security interest in the items of Equipment identified
herein.

         1.      To further secure the payment and performance of all of
Borrower's obligations to lender under the Loan Documents, Borrower hereby
grants to Lender a first priority security interest in the items of Collateral
described below, including all present and future additions, attachments and
accessories thereto, all substitutions therefor and replacements thereof and
all proceeds thereof, including all proceeds of insurance:

<TABLE>
<CAPTION>
  Qty.   Model/Mfr.    Description     Serial No.    Cost or Appraised Value
  ----   ----------    -----------     ----------    -----------------------
   <S>              <C>               <C>                 <C>
   50               Configurable SAR  830 thru 879        $433,000.00
</TABLE>

         2.      Borrower hereby (a) affirms that the representations and
warranties set forth in Section 5 of the Loan and Security Agreement are true
and correct as of the date hereof; (b) represents and warrants that Lender has
a first priority security interest in the Collateral; and (c) represents and
warrants that the above described equipment will be maintained at the following
location(s):

         59 Highway South
         Rosenberg, TX 77471

         3.      The Loan Amount for loans to be made pursuant to this
Supplemental Security Agreement is $433,000.00.

         4.      The Commitment Expiration Date for loans to be made pursuant
to this Supplemental Security Agreement is March 31, 1996.

         5.      The amount of liability insurance required to be maintained by
Borrower pursuant to Section 6(d) of the Loan and Security Agreement is
$300,000.00.





                                     - 23 -
<PAGE>   24
         6.      All of the terms and provisions of the Loan and Security
Agreement are hereby incorporated in and made a part of this Supplemental
Security Agreement to the same extent as if fully set forth herein.

         In witness whereof, Borrower has executed and delivered this
Supplemental Security Agreement this _____day of ___________, 1996.


                                Borrower:        SEITEL GEOPHYSICAL, INC.

                                By:              
                                                 --------------------------
                                (Print Name):    
                                                 --------------------------
                                Title:           
                                                 --------------------------





                                     - 24 -
<PAGE>   25
No. 2004096-001                                             TERM PROMISSORY NOTE
$433,000.00                                                       March 14, 1996


         FOR VALUED RECEIVED, the undersigned, SEITEL GEOPHYSICAL, INC.,
("Maker"), promises to pay to the order of MetLife Capital Corporation
("Payee"), at its office at P.O. Box C-97550, Bellevue, Washington 98009, the
principal sum of Four Hundred Thirty Three Thousand and no/100ths ($433,000.00)
Dollars together with interest on unpaid principal from the date of
disbursement of such principal amount until payment in full at a rate of 7.52
percent (7.52%) per annum ("Rate") computed on the basis of a 360 day year of
twelve consecutive thirty day months.  Interest hereunder shall be paid on the
unpaid principal, together with principal, in Thirty Six (36) installments of
Thirteen Thousand Four Hundred Seventy Two Dollars and 97/100ths ($13,472.97)
commencing on April 14, 1996 and monthly thereafter until March 14, 1999, on
which date the entire balance of principal and interest unpaid shall be due and
payable.  It is agreed that each installment, when paid, shall be applied by
the holder hereof, first so much as shall be required to the payment of
interest accrued as specified hereto, and the balance thereof to the repayment
of the principal sum.

         Except as may be otherwise expressly provided herein, this Note may
not be prepaid in whole or in part, except with the prior written consent of
Payee.  Maker shall have the privilege of prepaying all (but not part) of the
then outstanding balance under this Note on March 14, 1998 or on any
installment due date thereafter, subject to giving thirty (30) days prior
written notice to Payee specifying the date of prepayment and further subject
to payment of a prepayment premium equal to the amount, if any, required to
offset the adverse impact to Payee of any decline in interest rates.  The
prepayment premium is determined by (i) calculating the decrease, expressed in
basis points (but not less than zero) in the current weekly average yield for
Two (2)-year U.S. Treasury Constant Maturities as published in Federal Reserve
Statistical Release H.15(519) (the "Index") from the weekly average yield of
5.040 as of January 23, 1996 to the Friday (or, if Friday is not a business
day, the last business day) of the week immediately preceding the prepayment
date (ii) dividing the difference by 100, (iii) multiplying the result by the
applicable "Premium Factor" set forth below, and (iv) multiplying the product
by the principal to be prepaid. Any prepayment shall be applied first to the
prepayment premium, if any, next to accrued interest and late charges (if any),
and thereafter to the principal then outstanding.  The Premium Factor shall be
the amount shown on the following chart for the month in which prepayment
occurs.

<TABLE>
<CAPTION>
Number of Months Remaining         (Years)         Premium Factor
- --------------------------         -------         --------------
        <S>                          <C>                <C>

        12 - 1                       (1)                .005
</TABLE>





                                     - 25 -
<PAGE>   26
         In the event the Federal Reserve Board ceases to publish Statistical
Release H.15(519), then the decrease in Two-Year U.S. Treasury Constant
Maturities will be determined from another source designated by Payee.

         If Maker shall have given to Payee notice of Maker's intention to so
prepay, Maker shall not then be entitled to withdraw such notice, and the
indebtedness proposed to be prepaid in such notice together with the aforesaid
prepayment fee, if applicable, shall be due and payable upon the date specified
for such prepayment in such notice.  Upon the occurrence of an Event of Default
and acceleration of payment of indebtedness evidenced hereby during a period
open to prepayment, Maker shall pay to Payee, in addition to any and all other
sums due and payable hereunder, as liquidated damages for the loss of Payee's
investment and not as a penalty, an amount equal to the prepayment fee which
would have been payable hereunder on such date of acceleration in the event of
a voluntary prepayment.  Maker and Payee agree that the foregoing amounts do
not constitute penalties but rather constitute reasonable calculations of the
investment loss that would be sustained by Payee in the event of such
prepayment.

         It is specifically understood and agreed by Maker that, in the event
of a default under this Note or under any instrument securing the Note, a
tender of payment of the unpaid principal and accrued interest then outstanding
shall be deemed a prepayment, and, accordingly, said tender must include the
premium herein above required, or if said tender is made prior to the time this
privilege is operative, then said tender must include a premium equal to six
(6) months' interest at the Rate computed on the principal amount so tendered.
It is further understood and agreed by Maker that Payee shall not be obligated
to accept said tender, and said tender shall for all purposes be deemed
ineffectual and deficient, unless said tender shall include the premium herein
above required.

         In the event that Payee does not receive any payment on the date due,
Maker will pay Payee a late charge of five percent (5%) of the payment
outstanding together with the payment and, provided said sum is received within
ten (10) days of the date due, Payee agrees not to demand immediate payment of
the whole sum of principal and interest as otherwise permitted herein.

         If, from any circumstances whatsoever, payment of any obligation due
under this Note at the time such performance shall be due shall involve
exceeding the maximum amount currently prescribed by any applicable usury
statute or any other applicable law, then such obligation shall be reduced to
such maximum amount, so that in no event shall any payment be possible under
this Note, or under any other instrument evidencing or securing the
indebtedness evidenced hereby, that is in excess of such maximum amount.





                                     - 26 -
<PAGE>   27
         In the event that an Event of Default shall occur under the Loan and
Security Agreement (as hereinafter defined) or any other instrument now or
hereafter securing repayment hereof, following any required notice and/or the
expiration of any applicable period of grace, then, and in such event, the
principal indebtedness evidenced hereby, and any other sums advanced hereunder,
together with all unpaid interest accrued thereon, shall, at the option of
Payee, at once become due and payable and may be collected forthwith,
regardless of the stipulated date of maturity.  TIME is OF THE ESSENCE WITH
RESPECT TO THIS NOTE.  Interest shall accrue on the outstanding principal for
so long as such default continues, regardless of whether or not there has been
an acceleration of the indebtedness evidenced hereby as set forth herein, at
the rate equal to the lesser of fifteen percent (15%) per annum or the maximum
rate allowable under law.  All such interest shall be paid at the time of and
as a condition precedent to the curing of any such default should Payee, at its
sole option, allow such default to be cured.  In the event this Note, or any
part thereof, is collected by or through an attorney-at-law, Maker agrees to
pay all costs of collection including, but not limited to, reasonable
attorneys' fees, whether or not suit is filed.

         This Note is one of the notes referred to in and is secured by the
Loan and Security Agreement dated February 22, 1996 between Maker and Payee.
The terms of the Loan and Security Agreement are incorporated herein by
reference.

         This Note consolidates the following Interim Notes executed by Maker
in favor of Payee

<TABLE>
<CAPTION>

     Interim Note Number                 Date          Principal Amount
     -------------------                 ----          ----------------
     <S>                               <C>             <C>

     Request for Loan Proceeds One   March 14, 1996      $433,000.00
</TABLE>

         Maker waives any right of exemption and waives presentment, protest
and demand and notice of protest, demand and of dishonor and nonpayment of this
Note, and consents that any holder hereof shall have the right, without notice,
to grant any extension or extensions of time for payment of this Note or any
part thereof or any other indulgences or forbearances whatsoever, or may
release any of the security for this Note without in any way affecting the
liability of any other party for the payment of this Note.

         The due payment and performance of Maker's obligations hereunder shall
be without regard to any counterclaim, right of offset, or any other
counterclaim whatsoever which Maker may have against Payee and without regard
to any other obligations of any nature whatsoever which Payee may have to
Maker, and no such counterclaim or offset shall be asserted by Maker in any
action, suit or proceeding instituted by Payee for payment of Maker's
obligations hereunder.





                                     - 27 -
<PAGE>   28
         This Note and the Loan and Security Agreement shall be governed by and
construed in accordance with the laws of the State of Washington.

         Maker acknowledges that there is no presumption that the value of the
property securing this Note is equal to the face amount of the Note, and that a
deficiency judgment may be necessary in proceedings taken for enforcement
hereof.

         No amendment to this Note shall be binding upon Payee unless it is in
writing and duly signed by Payee.


         IN WITNESS WHEREOF, the Maker has caused these presents to be duly
signed the date first above written.




                                    Borrower:        SEITEL GEOPHYSICAL, INC.
                                 
                                    By:  
                                                     ---------------------------
Witness:                            (Print Name)     
         --------------------                        ---------------------------
                                    Title:           
                                                     ---------------------------



                                     - 28 -

<PAGE>   1

[    ]   METROPOLITAN LIFE                                               10.6.1
             AND AFFILIATED COMPANIES
                                                MASTER EQUIPMENT LEASE AGREEMENT
             METLIFE CAPITAL CORPORATION

THIS AGREEMENT is entered into the 20th day of May, 1994 between METLIFE
CAPITAL, LIMITED PARTNERSHIP ("Lessor") whose address is 10900 N. E. 8th
Street, mailing address C-97550, Bellevue, Washington 98009 and Seitel
Geophysical, Inc.  d/v/a Eagle Geophysical ("Lessee") whose address is 50 Briar
Hollow Lane West, 7th Floor, Houston, Texas 77027, Lessor and Lessee from time
to time may enter into written agreements in the form of "Request to Purchase
Addenda" for the purchase by Lessor of equipment and leasing of such equipment
to Lessee.  To facilitate such transactions, Lessor and Lessee are entering
into this Master Equipment Lease Agreement (the "Master Lease"), the terms and
provisions of which shall be incorporated by reference in each such Request to
Purchase, and they MUTUALLY AGREE AS FOLLOWS:

1.       REQUEST TO PURCHASE

If Lessor agrees to acquire and lease equipment when requested by Lessee, the
parties shall sign a Request to Purchase Addendum ("Request to Purchase")
setting forth the particulars regarding the transaction, including, without
limitation, the list of items of equipment (individually, an "Item" and,
collectively, the "Equipment"), the prices of each Item (including disclosure
of all rebates, discounts and other incentives received or receivable with
respect thereto), "Related Costs," including taxes, transportation,
installation and other applicable costs, the aggregate of the foregoing ("Total
Cost"), length of the Basic Term, rental rates and other applicable provisions.
"Cost of an Item" shall mean the price of the Item plus its applicable portion
of Related Costs.  In the absence of a signed Request to Purchase, this Master
Lease shall not constitute a lease or a commitment by either party to enter
into a lease.

2.       PURCHASE; ACCEPTANCE

         (a)     REQUEST; SPECIFICATIONS.  Signing a Request to Purchase shall
constitute the request from Lessee to Lessor to purchase the Equipment, and the
Request to Purchase and this Master Lease shall constitute the lease and
agreement (the "Lease") regarding the Equipment.  Lessee will assign to Lessor
purchase orders or agreements issued or entered into by Lessee for the
Equipment, or Lessor shall issue Lessor's purchase orders to the suppliers of
the Equipment, as Lessor at the time shall deem appropriate, all in form and
substance satisfactory to Lessor.  At the time of signing the Request to
Purchase, Lessee shall furnish Lessor detailed specifications
("Specifications") for the purchase of the Items, including descriptions,
prices, delivery terms and instructions, installation provisions and all other
applicable specifications.  Lessee assumes full responsibility with respect to
the selection of Items supplied for lease and the specification thereof; the
Lessor shall have no liability or responsibility with respect thereto
regardless of whether the specifications prove inadequate for the intended
purpose or use.

         (b)     INSPECTION; ACCEPTANCE.  It is Lessee's responsibility to
receive and promptly inspect and test each Item tendered for delivery by a
supplier and the installation thereof.  Lessee shall give Lessor written notice
of acceptance of an Item as soon as it can be determined that the Item and its
installation are in compliance with Specifications.  As between Lessee and
Lessor, the giving of such written notice shall constitute Lessee's irrevocable
acceptance of the Item or Items designated in the notice, whether or not such
items or their installation or Lessor's title to the same are defective in any
respect, and notwithstanding any failure of an Item or its installation to
conform to Specifications, without prejudice however to rights which Lessor and
Lessee, or either of them, may have against any other person, whether with
respect to design, manufacture, condition or otherwise.

         (c)     PURCHASE CUT-OFF DATE.  If, by the "Purchase Cut-Off Date" set
forth in a Request to Purchase, Lessee shall not have given Lessor written
notice of acceptance of an Item, Lessor shall have no obligation to purchase
the Item or to lease it to Lessee.  In such event, Lessee shall immediately pay
all accrued interim Rental and reimburse Lessor for all sums Lessor may have
paid for or with respect to the Item and for all Lessor's costs and expenses
with respect thereto, and Lessee shall indemnify and defend Lessor against and
hold Lessor harmless from any and all cost, expense, loss, liability and damage
that Lessor may suffer or that may be asserted against Lessor by reason of
Lessor's failure or refusal to purchase such Item.  Any such item shall be
deemed to be deleted from the Request to Purchase and no longer included in the
Equipment.





                                       1
<PAGE>   2
         (d)     CONDITIONS.  Lessee shall deliver to Lessor such further
instruments, documents and certifications as Lessor reasonably may request,
including without limitation evidences of authority (e.g., corporate
certificates, corporate resolutions, partnership documents and authorizations),
evidence of insurance, purchase orders and acceptances thereof, purchase and
sale agreements and financial information, and instruments and documents to
implement, perfect or continue the perfection of Lessor's rights and remedies
as owner and Lessor of the Equipment, including Uniform Commercial Code forms.
Notwithstanding the execution, delivery or filing of any instruments or
documents, it is agreed that this transaction is a lease and is not intended as
security.  Lessee's delivery of the foregoing and of the Specifications are
conditions precedent to any obligation of Lessor to purchase or to make any
commitments to purchase or pay for the Equipment or any item.

         (e)     SUPPLEMENTAL LEASE SCHEDULE.  If at any time prior to the
Closing Date Lessee requests Lessor to add further Items to the Equipment, and
if Lessor so agrees, Lessee shall execute a Supplemental Request to Purchase in
a form supplied by Lessor, which shall become part of the Request to Purchase,
subject to all of its provisions and the provisions of this Master Lease, and
the equipment specified therein shall be Items of Equipment under the Lease.
If at any time after the Closing Date Lessee requests Lessor to add further
Items to the Equipment, and if Lessor so agrees, Lessee shall execute an
additional Request to Purchase Addendum, amending the Lease to include such
Items as part of the equipment and setting forth the particulars with respect
thereto.  The Basic Term with respect to all Equipment, including Items covered
by a Supplemental Lease Schedule, shall terminate in accordance with the
provisions of the original Request to Purchase.

         (f)     CLOSING.  Following the date ("Closing Date") which is the
earlier of (i) the date Lessee gives Lessor written notice of acceptance of the
last Item or (ii) the Purchase Cut-Off Date (or on such other day as is
mutually agreed), Lessor shall send Lessee a Closing Schedule, setting forth
any adjustments to descriptions and Costs of Items and Total Cost and
confirming the Closing Date and amount of Periodic Rental installments and
payment schedules.  Such Closing Schedule and the facts and determinations set
forth therein shall be conclusive unless, within sixty (60) days after the
Closing Schedule is sent by Lessor to Lessee, Lessee shall give Lessor written
notice specifying any claimed error therein.  Notwithstanding any such notice,
Lessee shall pay all rentals as they become due.  If Lessee establishes an
error that affects the amount of rentals, Lessor shall give Lessee a credit for
any overpayment of rentals, and Lessee promptly shall pay Lessor any
underpayments.

3.       LESSEE'S WARRANTIES

         (a)     Lessee represents and warrants to Lessor that it is a
corporation or partnership duly organized, validly existing and in good
standing under the laws of the jurisdiction of its organization and that it is
qualified to do business in every jurisdiction where the failure to qualify
would have a materially adverse effect on Lessor's rights hereunder; it has
taken all corporate or partnership action which may be required to authorize
the execution, delivery and performance of this Lease, and such execution,
delivery and performance will not conflict with or violate any provision of its
Charter or Articles or Certificate of Incorporation, By-laws or any provisions
thereof, or in the case of a partnership, its Certificate of Partnership or
Limited Partnership and its Partnership Agreement, or result in a default or
acceleration of any obligation under any agreement, order, decree or judgment
to which it is a party or by which it is bound, nor is it now in default under
any of the same; there is no litigation or proceeding pending or threatened
against it which may have a materially adverse effect on Lessee or which would
prevent or hinder the performance by it of its obligation hereunder; this lease
and the attendant documents constitute valid obligations of the Lessee, binding
and enforceable against it in accordance with their respective terms; no action
by or with any commission or administrative agency is required in connection
herewith; it has the power to own its assets and to transact business in which
it is engaged; it will give to Lessor prompt notice of any change in its name,
identity or structure.

         (b)     Lessee's written acceptance of an Item and its installation
shall constitute a REPRESENTATION AND WARRANTY BY Lessee to Lessor that: (i)
the Item is personal property in good order and condition and, unless Lessor
otherwise agrees in writing, has not been used prior to the time of such
written notice of acceptance, the Equipment does not constitute "imported
property covered by an Executive order" as defined in Section 168(g)(6) of the
Internal Revenue Code of 1986 ("Code"), and that the recovery period set forth
in the Request to Purchase is the period applicable under the Code to the
Equipment; and (ii) at all times Lessee shall keep the Equipment in Lessee's
possession at the address specified in the Request to Purchase unless Lessor
shall otherwise consent in





                                       2
<PAGE>   3
writing.  Lessee shall not cause, suffer or permit any Item to be attached or
affixed to real property or improvements thereon (collectively, "Realty")
unless Lessor first shall consent thereto in writing and Lessee shall have
obtained from all persons having any interest in the Realty written consents
which approve such attachment, waive any claims to or encumbrances upon
attached Items and consent to the detachment and removal of such Items at any
time by Lessor or Lessee.  Notwithstanding attachment of any Items to Realty,
all the Equipment at all times shall be and remain personal property.  Upon
termination of Lessee's right to possession of the Equipment, whether by
expiration of the Term or otherwise, Lessee at its sole cost and expense shall
detach and remove the Equipment from the Realty and save Lessor harmless from
and indemnify and defend Lessor against any claim, demand, loss, liability, and
damage arising from such detachment, removal or both.

4.       TERM OF LEASE

The term of the Lease ("Term") shall consist of an "Interim Term" and a "Basic
Term."  The Interim Term shall begin on the date that Lessee first gives Lessor
written notice of acceptance of an Item or written approval for partial
payment, whichever is earlier, and shall continue until the time the Basic Term
begins.  The Basic Term shall begin on the Closing Date and shall continue for
the length of the Basic Term set forth in the Request to Purchase.

5.       INTERIM RENTAL

During the Interim Term, Lessee shall pay rent monthly ("Interim Rental"), on a
calendar month basis, in an amount determined by Lessor by applying the
"Interim Rental Rate" set forth in the Request to Purchase to portions of the
Total Cost then or theretofore expended by Lessor, for the number of days such
sums are outstanding during such calendar month.  The "prime rate" referred to
in this Lease shall mean the rate per annum announced by Chase Manhattan Bank,
New York City, from time to time as its prime rate, whether or not such rate is
applied by said bank to any then outstanding loans, changing with each
announced change of such prime rate.  Lessee shall pay Lessor each installment
of Interim Rental on the fifteenth day after the end of such calendar month.

6.       PERIODIC RENTAL

Lessee shall pay rent ("Periodic Rental") for the Basic Term in an amount
calculated by multiplying the Total Cost by the Periodic Rental Rate set forth
in the Request to Purchase multiplied by the number of months constituting the
length of the Basic Term.  Lessee shall pay installments of Periodic Rental to
Lessor in accordance with the payment schedule set forth in the Request to
Purchase.

7.       LATE PAYMENT

If any installment of rent or other sum owing under the Lease shall not be paid
when due and shall remain unpaid for ten (10) days, Lessee shall pay Lessor a
late charge equal to five percent (5%) of the amount delinquent, but in no
event at a rate greater than limited by any applicable law.  Such late charge
is in addition to and not in lieu of other rights and remedies Lessor may have.

8.       INSURANCE

Lessee shall procure and continuously maintain and pay for (a) all risk
physical damage insurance covering loss or damage to the Equipment for not less
than the full replacement value thereof naming Lessor as Loss Payee and (b)
bodily injury and property damage combined single limit liability insurance
naming Lessor as Additional Insured, all in such amounts and against such risks
and hazards as are set forth in the Request to Purchase, with insurance
companies and pursuant to contract or policies and with deductibles thereon
satisfactory to Lessor.  All contracts and policies shall include provisions
for the protection of Lessor notwithstanding any act or neglect of or breach or
default by Lessee, shall provide that they may not be modified, terminated or
cancelled unless Lessor is given at least ten (10) days' advance written notice
thereof, and shall provide that the coverage is "primary coverage" for the
protection of Lessee or Lessor notwithstanding any other coverage carried by
Lessee or Lessor protecting against similar risks.  Lessee shall promptly
notify any appropriate insurer and Lessor of each and every occurrence which
may become the basis of a claim or cause of action against the insureds and
provide Lessor with all data pertinent to such occurrence.  Lessee shall
furnish Lessor with certificates of such insurance or copies of policies upon
request,





                                       3
<PAGE>   4
and shall furnish Lessor with renewal certificates not less than ten (10) days
prior to the renewal date.  Proceeds of all insurance shall be payable first to
Lessor to the extent of its liability or interest as the case may be.

9.       TAXES

Lessee shall pay or reimburse Lessor for the payment of all taxes, fees,
assessments and other governmental charges of whatsoever kind or character and
by whomsoever payable on or relating to any Item of Equipment or the sale,
purchase, ownership, use, value, value added, possession, shipment,
transportation, delivery or operation thereof or the exercise of any option,
election or performance of any obligation by Lessee hereunder, which may accrue
or be levied, assessed or imposed during the Term and any Renewal Term or which
remain unpaid as of the date of surrender of such Item to Lessor, and all taxes
of any kind imposed by any federal, state, local or foreign taxing authority
against Lessor on or measured by any amount payable by Lessee hereunder,
including, without limitation, all license and registration fees and all sales,
use, value, ad valorem, personal property, excise, gross receipts, stamp or
other taxes, imposts, duties and charges together with any penalties, fines or
interest thereon, except taxes of Lessor on net income imposed by the United
States or any state.  Lessee shall reimburse Lessor for any payments made by
Lessor which are the obligation of Lessee under the Lease, but Lessee shall not
be obligated to pay any amount under this Section so long as it shall in good
faith and by appropriate proceedings contest the validity or the amount
thereof, unless such contest would adversely affect the title of Lessor to any
Item of Equipment or would subject any Item to forfeiture or sale.  Lessee
shall indemnify Lessor on an after-tax basis against any loss, claim, demand
and expense, including legal expense, resulting from such nonpayment or
contest, and further agrees to indemnify Lessor against any and all taxes,
assessments and other charges imposed upon Lessor under the laws of any
federal, state, local or foreign government or taxing authority, as a result of
any payment made by Lessee pursuant to this Section.  Whenever this lease
terminates as to any Item, Lessee will, on request, advance to Lessor the
amount estimated by Lessor to equal personal property taxes on the Item which
are not yet payable but for which Lessee will afterward become liable
hereunder;  Lessor will account to Lessee for such advances.  On request of
either Lessor or Lessee, the other will submit written evidence of all payments
required of it under this section.


10.      MAINTENANCE, ETC.

         (a)     Lessee at its expense at all times shall: (i) keep the
Equipment in good and efficient working order, condition and repair, ordinary
wear and tear excepted, and make all inspections and repairs, including
replacement of worn parts, to effect the foregoing and to comply with
requirements of laws, regulations, rules and provisions and conditions of
insurance policies; and (ii) pay all costs, expenses, fees and charges incurred
in connection with the use or operation of the Equipment and of each Item,
including but not limited to repairs, maintenance, storage and servicing.
Lessee shall not make any alterations, substitutions, improvements or additions
to the Equipment or Items, except those required in order to comply with laws,
regulations, rules and insurance policies, unless Lessor first shall have
consented thereto in writing.  Notwithstanding any consent by Lessor, Lessee
shall pay all costs and expenses of the foregoing.  All replacements, repairs,
improvements, alterations, substitutions and additions shall constitute
accessions to the Equipment and title thereto shall vest in Lessor.

         (b)     Lessor hereby transfers and assigns to Lessee, for so long
during the Term and any Renewal Term as Lessee is not in default, Lessor's
right, title and interest in, under and to any assignable factory and dealer
warranty, whether express or implied, with respect to the Equipment.  All
claims and actions upon any warranty shall be made and prosecuted by Lessee at
its sole cost and expense.  Lessor shall have no obligation to make or
prosecute any claim upon or under a warranty.  So long as Lessee shall not be
in default, Lessor shall cooperate with Lessee with respect to a claim on a
non-assignable warranty, at Lessee's expense.  Lessee shall have proceeds of a
warranty claim or recovery paid to Lessor.  Lessor shall make such proceeds
available for any repair, restoration or replacement to correct such warranted
condition.  Excess proceeds shall be used to reduce Lessee's Lease obligations.

11.      USE

So long as Lessee shall not be in default, Lessee shall be entitled to the
possession, use and quiet enjoyment of the Equipment during the Term and any
Renewal Term in accordance with the terms of the Lease.  Unless a purchase
option is exercised, Lessee shall deliver and surrender the Equipment to Lessor
at the end of the Term or Renewal





                                       4
<PAGE>   5
Term in accordance with paragraph 20, hereof.  Lessee warrants that the
Equipment will at all times be used and operated solely in the conduct of
Lessee's business for the purpose for which it was designed and intended and
under and in compliance with applicable laws and all lawful acts, rules,
regulations and orders of any governmental bodies or officers having power to
regulate or supervise the use of such property, except that Lessee may in good
faith and by appropriate proceedings contest the application of any such rule,
regulation or order in any reasonable manner that will not adversely affect the
title of Lessor to any Equipment or subject the same to forfeiture or sale.
Lessee will not permit its rights or interests hereunder to be subject to any
lien, charge or encumbrance and will keep the Equipment free and clear of any
and all liens, charges, encumbrances and adverse claims (except those arising
from acts of Lessor).

12.      NET LEASE; LOSS AND DAMAGE

         (a)     This is a net lease.  Lessee assumes all risk of and shall
indemnify Lessor against all damage to and loss of the Equipment from any cause
whatsoever, whether or not such loss or damage is or could have been covered by
insurance.  Except as otherwise specifically provided herein, the Lease shall
not terminate and there shall be no abatement, reduction, suspension or
deferment of Interim or Periodic Rental for any reason, including damage to or
loss of the Equipment or any one or more Items.  Lessee promptly shall give
Lessor written notice of any material loss or damage, describing completely and
in detail the cause and the extent of loss and damage.  At its option, Lessee
shall (i) repair or restore the damaged or lost Items to good condition and
working order; or (ii) replace the damaged or lost Items with similar equipment
in good condition and working order; or (iii) pay Lessor in cash the Stipulated
Loss Value of the damaged or lost Items.  Upon Lessee's complying with the
foregoing, Lessor shall pay or cause to be paid over to Lessee the net proceeds
of insurance, if any, with respect to such damage or loss.  "Damage" and "loss"
shall include damages and losses of any kind whatsoever including, without
limitation, physical damage and partial or complete destruction, including
intentionally caused damage and destruction, and theft.

         (b)     If Lessee pays Lessor the Stipulated Loss Value for an Item,
then the Lease shall terminate with respect to that Item, that Item shall no
longer be deemed part of the Equipment and Lessee shall be entitled to retain
the Item.  However, it is understood that Lessor makes no representation or
warranty with respect to the Item, and further that Lessor shall have no
obligation to pay any tax with respect thereto.  In the event that Lessee pays
Lessor the Stipulated Loss Value for an Item, no further Interim Rental shall
be payable with respect to the Item, and Periodic Rental for the remainder of
the Term shall be reduced by multiplying the Cost of that Item by the Periodic
Rental Rate by the number of months then remaining in the Basic Term.

13.      STIPULATED LOSS VALUE

The Stipulated Loss Value of an Item shall be a sum computed by Lessor, which
shall not exceed the amount determined by multiplying the Cost of the Item by
the Stipulated Loss Factor as set forth in the Request to Purchase for the
Lease Year during which the loss of the Item occurs.  Stipulated Loss Value is
based on the recovery period specified in the Request to Purchase.

14.      OWNERSHIP AND MARKING

Lessee has not and by execution and performance hereof will not have or obtain
any title to the Equipment or any other interest therein except as Lessee
hereunder and subject to all the terms hereof.  Title to the Equipment shall at
all times remain in Lessor and Lessee at its expense shall protect and defend
the title of Lessor and keep it free of all claims and liens other than the
rights of Lessee hereunder and claims and liens created by or arising through
Lessor.  Lessee will treat this transaction as a lease for tax purposes and
will not claim any credit or deduction inconsistent with Lessor's ownership of
the Equipment.  On or before the delivery thereof, Lessee will cause each Item
of Equipment (to the extent practicable and, to the extent not practicable,
then each major component) to be plainly, permanently and conspicuously marked
by stenciling or by a metal tag or plate or decal affixed thereto with the
following legend:

         PROPERTY OF AND LEASED FROM METLIFE CAPITAL, LIMITED PARTNERSHIP
         10900 N.E. 4TH, SUITE 500 C-97550, BELLEVUE, WASHINGTON 98009





                                       5
<PAGE>   6
Lessee shall replace any such marking which may be removed or destroyed or
become illegible and keep the Equipment free from any markings or labelings
which might be interpreted as a claim of ownership thereof by Lessee or any
other person except Lessor or its assigns.

15.      LESSEE'S INDEMNITIES

         (a)     GENERAL INDEMNITIES.  Lessee will defend, indemnify and hold
harmless Lessor from and against any claim, cause of action, damage, liability,
cost or expense (including but not limited to legal fees and costs) which may
be asserted against or incurred in any manner by or for the account of Lessor
or Lessee (i) relating to the Equipment or any part thereof, including without
limitation the manufacture, construction, purchase, delivery, acceptance or
rejection, installation, ownership, sale, leasing, removal or return of the
Equipment, or as a result of the use, maintenance, repair, replacement,
operation or the condition thereof (whether defects are latent or
discoverable); (ii) by reason or as a result of any act or omission of Lessee
for itself; (iii) as a result of claims for patent, trademark or copyright
infringement; or (iv) as a result of product liability claims or claims for
strict liability.

         (b)     FEDERAL TAX INDEMNITIES.  If Lessor shall lose the right to
claim, suffer a disallowance of or be required to recapture all or any portion
of (i) the accelerated cost recovery deductions pursuant to Code Section 168
with respect to the Total Cost for property with recovery period(s) referred to
in the Request to Purchase, then, unless such result is due to Lessor's act or
omission (other than its exercise of remedies after default) or to a loss for
which Lessee pays the Stipulated Loss Value of the affected Equipment, Lessee
shall pay to Lessor on demand a sum equal to the amount of deductions or
credits lost by Lessor as a result of such event, plus the amount of any
interest, penalties and additions to tax payable by Lessor as a result of such
event.  The amount of lost deductions and credits to be paid by Lessee pursuant
to this Section shall be computed by Lessor so as to cause Lessor's after-tax
rate of return on investment and after-tax cash flows in respect of the Lease
to equal that which would have been realized by Lessor if such event had not
occurred, but without regard to whether Lessor has or would have had taxable
income sufficient to use the lost deductions or credits.

         (c)     Lessee shall indemnify Lessor against any and all taxes,
assessments and other charges imposed upon Lessor under the laws of any
federal, state, local or foreign government or taxing authority, as a result of
any payment made by Lessee pursuant to this Section 15.

16.      PURCHASE AND RENEWAL OPTIONS

         (a)     PURCHASE OPTION.  Lessee may purchase all, but not less than
all of the Equipment on the last day of the Term or any Renewal Term (the
"Option Date"), for cash, at the Equipment's then Fair Market Value, provided
Lessee is not then in breach or default and that Lessee gives Lessor written
notice of election to purchase at least sixty (60) days prior to the Option
Date.  Upon payment of the purchase price and all Rentals and other sums owing
or to become owing to and including the Option Date, Lessor shall transfer to
Lessee all of Lessor's right, title and interest in the Equipment, in its then
condition, without any representation or warranty other than the warranty that
the Equipment is not subject to any liens resulting from acts of Lessor.  For
purposes of this Lease, the term "Fair Market Value" shall be an amount agreed
upon by Lessor and Lessee or if such parties are unable to agree prior to the
Option Date, such value shall be determined by an appraiser chosen by mutual
agreement.  Lessee shall pay the fees and expenses of the appraiser.

         (b)     RENEWAL OPTION.  At the end of the Term or of a Renewal Term
(the "Option Date"), provided there shall be no breach or default by Lessee or
event which with the giving of notice or passage of time, or both, might mature
into an event of default, Lessee may renew the lease for such additional period
of time (the "Renewal Term") as may be agreed upon by Lessor and Lessee, by
giving Lessor written notice of election to renew at least sixty (60) days
before the Option Date.  If Lessor and Lessee do not otherwise agree on the
length of the Renewal Term, it shall be for a period of twelve (12) calendar
months.  The rental for the Renewal Term shall be the Equipment's fair market
rental value as of the first day of the Renewal Term.  If by the Option Date
the parties do not agree as to the rental, the fair market rental value shall
be determined by an independent appraiser selected by mutual agreement.  Lessee
shall pay rental installments based on Lessor's estimate of fair market rental
value until the issue is resolved, at which time appropriate additional
payments or credits shall be made or given.  Lessee shall pay the fees and
expenses of the appraiser.  All provisions of the Lease shall continue in full
force and effect during a Renewal Term except for the amount of the rental.





                                       6
<PAGE>   7
17.      LESSOR MAY PERFORM

If Lessee at any time shall fail to pay to any person any sum which Lessee is
required by the Lease to pay or shall fail to do or perform any other thing
Lessee is required by the Lease to do or perform, Lessor at its option may pay
such sum or do or perform such thing, and Lessee shall reimburse Lessor on
demand for the amount of such payment and for the cost and expense which may be
incurred by Lessor for such acts or performance, together with interest thereon
at the Default Rate from the date of demand until paid.

18.      DEFAULT

         (a)     EVENTS OF DEFAULT.  Each of the following shall constitute an
event of default: (i) failure to perform and comply with the provisions and
conditions of Section 8 hereof or to pay any sum, including installments of
rental, on the date when due; (ii) failure to perform and comply with any other
provision or condition of the Lease within thirty (30) days after Lessor shall
have given Lessee written notice of default with respect thereto, or failure to
make good, within thirty (30) days after written notice by Lessor to Lessee,
any representation or warranty, whether made in the Lease or in any
certificate, agreement, instrument or statement, including income and financial
statements, which shall prove to have been incorrect in any material respect
when made; (iii) any event of default occurs with respect to any obligations of
Lessee to Lessor on or with respect to any transactions, debts, undertakings or
agreements other than the Lease; (iv) the failure of Lessee generally to pay
debts as they become due in the ordinary course of business or the filing of
any application for the appointment of a receiver for a major part of Lessee's
assets or the filing of any petition or application by or against Lessee under
any present or future laws for the relief of debtors or for the subjection of
the property of a debtor to the control of any court, tribunal or agency for
the benefit of creditors, including proceedings under the Bankruptcy Code, if
the proceeding commenced by such filing shall not be dismissed within sixty
(60) days from the date of filing; (v) the execution by Lessee of a general
assignment for the benefit of creditors; (vi) the merger, consolidation,
reorganization, conversion to a Subchapter "S" status or dissolution of a
corporate or partnership Lessee, which has a materially adverse effect upon
Lessor's position under the Lease.

         (b)     EFFECT ON REQUEST TO PURCHASE.  Upon the occurrence of an
Event of Default, Lessor shall have no further obligation to Lessee to purchase
Equipment or Items or to lease any thereof to Lessee.

         (c)     REMEDIES.  (i) Upon the occurrence of an event of default as
provided above, Lessor may at its option (1) proceed by appropriate court
action or actions, either at law or in equity, to enforce performance by the
Lessee of the applicable covenants of this Lease or to recover damages for the
breach thereof; or (2) by notice in writing to the Lessee terminate Lessee's
right of possession of the Equipment, whereupon all rights of the Lessee to use
the Equipment shall absolutely cease and terminate, but Lessee shall remain
liable as herein provided.  Upon such a termination, Lessee at its expense
shall redeliver the Equipment to Lessor.  If Lessee shall fail to do so, Lessor
may retake possession of the Equipment by entering upon any premises at any
reasonable time and thereafter Lessor may hold, possess, sell, upgrade, lease
to others or enjoy the same, free from any right of Lessee, or its successors
or assigns.  If Lessor is required to retake possession, Lessee upon demand
shall reimburse Lessor for all costs and expenses relating thereto.
Notwithstanding such redelivery or retaking Lessor shall have a right to
recover from Lessee any and all amounts which under the terms of the Lease may
be then due or which may have accrued to the date of such termination, and also
to recover forthwith from the Lessee its damages for loss of a bargain and not
as a penalty, an amount equal to the higher of Fair Market Value or the
Stipulated Loss Value of the Equipment as of the rent payment date on or next
preceding the date of default, less: (1) the amount Lessor in fact receives
from the sale of the Equipment, after deduction of all estimated expenses of
such sale (Equipment which Lessor is unable to recover shall at Lessor's option
be deemed worthless.) or, (2) at Lessor's election, the present value of the
non-cancellable regularly scheduled rentals receivable from a subsequent lease
of all or part of the Equipment entered into by Lessor (discounted at the
Default Rate), and taking into account only the rentals receivable from the
commencement date of such subsequent lease until the end of the Lease Term
specified in the Request to Purchase for such Equipment.  In addition, Lessee
shall be liable to Lessor for all costs and expenses incurred by Lessor by
reason of Lessee's breach or default.  In addition to the foregoing, the Lessee
shall be liable for interest on any of the above referenced amounts from and
after the due date at the Default Rate, or the legal limit, whichever is
smaller. (ii) "Lessor's costs and expenses incurred by reason of Lessee's
breach or default" shall include, without limitation, costs and expenses of
receiving or retaking possession of the Equipment, storing, holding,
transporting, insuring,





                                       7
<PAGE>   8
caring for, servicing, maintaining and renting the Equipment or Items and
collecting rents and professional fees and expenses with respect to or incurred
by reason of the breach or default, including legal fees and expenses for
advice and legal services in any actions or proceedings which Lessor may
commence or in which Lessor may appear or participate to exercise or enforce
any rights or remedies or to protect or preserve any rights or interests, and
in all reviews of and appeals from any such actions or proceedings.  (iii) The
"Default Rate" of interest shall be a rate per annum computed monthly which
shall be five (5) percentage points above the prime rate, but not greater than
the maximum rate, if any, limited by applicable law.

19.      RIGHTS CUMULATIVE

Unless otherwise expressly provided herein, all rights and remedies of Lessor
are concurrent and cumulative.  The exercise or partial exercise of any remedy
shall not restrict Lessor from further exercise of that remedy or any other
remedy.

20.      SURRENDER

At any time that Lessee is required to deliver the Equipment to Lessor,  Lessee
shall immediately cease using the Equipment and at Lessee's expense shall
redeliver and surrender the Equipment to Lessor in good order, condition and
repair, ordinary wear and tear excepted, securely crated and safely packed, at
a place to be designated by Lessor in the State where the Equipment by the
terms of the Request to Purchase is required to be kept, and, if Lessor so
specifies, loaded FOB a common or contract carrier designated by Lessor.

21.      HOLDOVER

If Lessee shall not immediately redeliver and surrender any Item of Equipment
to Lessor when required by the terms hereof, Lessee shall pay Lessor, at such
time or times as Lessor may demand, a sum equal to a one-month installment of
Periodic Rental for each calendar month or fraction of a month during which
such failure to redeliver and surrender continues.

22.      INSPECTION; REPORTS

Lessor, its agents and employees shall have the right to enter upon any
premises where the Equipment or Items are then located to inspect and examine
the same during normal business hours and at any other times if Lessor
reasonably believes any Items or Lessor's rights are in jeopardy of damage or
loss.  So long as Lessee's not in default, Lessor shall give Lessee not less
than twenty-four (24) hours notice of such inspection.  Lessee shall
immediately give Lessor written notice of any damage to or loss of the
Equipment or any Items from any cause, including without limitation damage or
loss caused by accident, the elements, intentional acts and theft.  Such notice
shall set forth an itemization of the affected Items and a detailed account of
the event, including names of any injured persons and a description of any
damaged property arising from any such event or from any use or operation of
the Equipment or any Items.  All rights granted to Lessor herein are for the
benefit of Lessor and shall not be construed to impose any obligation on
Lessor, whether or not Lessor makes any inspections or receives any reports.

23.      FINANCIAL AND OTHER DATA

During the Term and any Renewal Term, Lessee: (a) shall furnish Lessor annual
balance sheets and profit and loss statements of Lessee and any guarantor of
Lessee's obligations accompanied, at Lessor's request, by the audit report of
an independent certified public accountant acceptable to Lessor; and (b) at
Lessor's request, shall furnish Lessor all other financial information and
reports reasonably requested by Lessor at any time, including quarterly or
other interim balance sheets and profit and loss statements of Lessee and any
such guarantor.  Lessee shall furnish such other information as Lessor may
reasonably request at any times concerning Lessee and its affairs.

24.      WARRANTY OF INFORMATION

Lessee warrants that all information furnished and to be furnished to Lessor is
accurate and that all financial statements it has furnished and hereafter may
furnish Lessor, including operating statements and statements of condition, are
and will be prepared in accordance with generally accepted accounting
principles, consistently applied,





                                       8
<PAGE>   9
and reasonably reflect and will reflect, as of their respective dates, results
of the operations and the financial condition of Lessee and any other entity
they purport to cover.

25.      NON-WAIVER

Neither the acceptance by Lessor of any payment or any other performance, nor
any act or failure of Lessor to act or to exercise any rights, remedies or
options in any one or more instances shall constitute a waiver of any such
right, remedy or option or of any other then existing or thereafter accruing
right, remedy or option, or of any breach of default then existing or
thereafter occurring.  No purported waiver by Lessor of any right, remedy,
option, breach or default shall be binding unless in writing and signed by an
officer of Lessor.  A written waiver by Lessor of any right, remedy, option,
breach or default shall not constitute a waiver or any other then existing or
thereafter accruing right, remedy or option or of any other then existing or
thereafter occurring breach or default.

26.      NOTICES; PAYMENTS

         (a)     A written notice may be given: (i) by delivering the same to a
corporate officer of the party to whom it is directed (the "Addressee"), or to
a general partner if the Addressee is a partnership, or to the owner if the
Addressee is a sole proprietorship; or (ii) by mailing the notice to the
Addressee by first class mail, registered or certified, with postage prepaid,
addressed to the Addressee at the address following its name in the opening
paragraph of the Request to Purchase or to such other address as Addressee may
specify by notice in writing given in accordance with this Section.  A notice
so mailed shall be deemed given on the third business day following the date of
mailing.  A "business day" shall be any day that is not a Saturday or Sunday or
legal holiday.

         (b)     The Lessee shall make all payments to Lessor at the place
where the notice is to be mailed to Lessor pursuant to subparagraph (a).
Payments are deemed paid when received by Lessor.

27.      ASSIGNMENT

         (a)     Lessee shall not assign the Lease or any rights in or to the
Equipment or Items.  Any attempted assignment shall be of no effect, unless
Lessor first shall have consented thereto in writing.  Lessor's consent to an
assignment in any one or more instances shall not impose any obligation upon
Lessor to consent to any other or further assignments.  Lessor's consent to an
assignment shall not release Lessee from any obligations with respect to the
Lease unless expressly so stated in the written consent.

         (b)     All rights of Lessor hereunder may be assigned, pledged,
mortgaged, transferred or otherwise disposed of, either in whole or in part,
without notice to Lessee but subject always to the rights of Lessee under this
Lease.  If Lessee is given notice of any such assignment, Lessee shall
acknowledge receipt thereof in writing.  In the event that Lessor assigns this
Lease or the rent due or to become due hereunder or any other interest herein,
whether as security for any of its indebtedness or otherwise, no breach of
default by Lessor hereunder or pursuant to any other agreement between Lessor
and Lessee, should there be one, shall excuse performance by Lessee of any
provision hereof, it being understood that in no event of such default or
breach by Lessor that Lessee shall pursue any rights on account thereof solely
against Lessor.  No such assignee shall be obligated to perform any duty,
covenant or condition requested to be performed by Lessor under the terms of
this Lease.

28.      SURVIVAL

The representations warranties, indemnities and agreements of Lessee, and
Lessee's obligations under any and all provisions of the Lease, shall survive
the expiration or other termination of the Lease, shall be binding upon its
successors and assigns and are expressly made for the benefit of and shall be
enforceable by Lessor and its successors and assigns.

29.      MISCELLANEOUS

         (a)     The term "Lessor" shall mean the Lessor named herein and its
successors and assigns.
         (b)     Whenever the context so requires, any pronoun gender includes
all other genders, and the singular includes the plural.  If more than one
person constitute Lessee, whether as a partnership or otherwise, all such
persons are and shall be jointly and severally liable for all agreements,
undertakings and obligations of Lessee.





                                       9
<PAGE>   10
         (c)     All captions and section, paragraph and other divisions and
subdivisions are for convenience of reference only and shall not affect the
construction, interpretation or meaning of the agreement or Lease or of any of
the provisions thereof.

         (d)     This Lease shall be governed by and construed according to the
law of the State of Washington.

         (e)     This Lease shall be binding upon and, except as limited in
Section 27 hereof, shall inure to the benefit of Lessor and Lessee and their
respective successors and assigns.

         (f)     This lease cannot be cancelled or terminated except as
expressly provided herein.

         (g)     Wherever Lessor's consent is required hereunder, such consent
will not be unreasonably withheld.

         (h)     Lessee's obligation to pay or reimburse Lessor for expenses as
provided hereunder shall be limited to reasonable expenses.

30.      LESSOR'S DISCLAIMER

Lessee acknowledges and agrees that it has selected both the Equipment of the
type and quantity which is the subject of this Lease and the supplier from whom
Lessor purchased the Equipment.  LESSOR MAKES NO REPRESENTATION OR WARRANTY,
EXPRESS OR IMPLIED, AS TO THE DESIGN, COMPLIANCE WITH SPECIFICATIONS,
CONDITION, QUALITY, WORKMANSHIP, OR THE SUITABILITY, ADEQUACY, OPERATION, USE
OR PERFORMANCE OF THE EQUIPMENT OR AS TO ITS MERCHANTABILITY OR FITNESS FOR ANY
PARTICULAR PURPOSE.  ANY DELAY IN DELIVERY SHALL NOT AFFECT THE VALIDITY OF
THIS LEASE.  The Lessee understands and agrees that neither the supplier nor
any salesman or any agent of the supplier is an agent of Lessor.  No salesman
or agent of supplier is authorized to waive or alter any term or condition of
this Lease, and no representation as to the Equipment or any other matter by
the supplier shall in any way affect Lessee's duty to pay the rent and perform
its obligations as set forth in this Lease.  Lessor shall not be liable to
Lessee for any incidental, consequential, or indirect damages or for any act,
neglect, omission, breach or default by any third party.

31.      NO AFFILIATION WITH SUPPLIERS

Lessee warrants that neither it nor any of its officers, directors (if a
corporation) or partners (if a partnership) has, directly or indirectly, a
substantial financial interest in the manufacturer or supplier of any Equipment
except as previously disclosed in writing to Lessor.

32.      ENTIRE AGREEMENT.

This Lease and any Requests to Purchase hereto shall constitute the entire
agreement between the parties and shall not be altered or amended except by an
agreement in writing signed by the parties hereto or their successors or
assigns.

IN WITNESS WHEREOF Lessor and Lessee have signed this agreement as of the day
and year first hereinabove written.

LESSOR:                                    LESSEE:
                                           
METLIFE CAPITAL,                           SEITEL GEOPHYSICAL, INC.
Limited Partnership                        dba Eagle Geophysical
                                           
By METLIFE CAPITAL CORPORATION,            By:  /s/ [illegible signature]
         General Partner                   
                                           Its:  President
By:___________________________________     

         Its:  Vice President





                                       10
<PAGE>   11
                                ADDENDUM NO. ONE

Addendum No. One to that certain Master Equipment Lease Agreement ("Lease")
dated May 20, 1994 by and between MetLife Capital, Limited Partnership
("Lessor") and Seitel Geophysical, Inc. DBA Eagle Geophysical ("Lessee").

Whereas, the parties desire to enter into the Lease provided that this Addendum
No. One is executed contemporaneously therewith;

NOW THEREFORE, it is agreed as follows:

Section 2(c) is amended to include the following at the end of the paragraph:

         Notwithstanding anything to contrary herein, Lessee shall not be
         responsible for any sums expended or costs and expenses incurred by
         Lessor that were not pre-approved in writing by Lessee.

Section 10(b) is amended to include the following at the end of the paragraph:

         Notwithstanding the foregoing, Lessor shall only be entitled to the
         proceeds of a warranty claim or recovery to the extent such proceeds
         reflect cost of repair, restoration or replacement of Equipment, and
         Lessee shall retain any proceeds for other costs or damages,
         including, without limitations, consequential damages and attorneys'
         fees.

Section 15(a) is amended to include the following at the end of the paragraph:

         Notwithstanding the above, Lessee shall not be required or obligated
         to indemnify Lessor for claims arising solely from the gross
         negligence or willful misconduct of Lessor.

Section 15 is amended to include the following additional section:

         (d) This Lease assumes that the provisions of the Internal Revenue
         Code of 1986 (as enacted October 22, 1986) govern this transaction. In
         the event a material adverse change in tax law, including but not
         limited to technical corrections, modifications or official
         interpretations of the Tax Reform Act of 1986, occurs prior to the
         Closing Date, then the rental factor shall be adjusted to preserve the
         Lessor's after-tax economics.

Section 18(a)(ii) is amended to include the following:

         The word "written" shall be inserted after the phrase fin the Lease or
         in any" and before the phrase "certificate, agreement, instrument or
         statement".

Section 23(a) is deleted and replaced with the following:

         (a) shall furnish Lessor annual balance sheets and profit and loss
         statements of Lessee. Additionally, Lessee shall furnish Lessor annual
         balance sheets and profit and loss statements of the guarantor of
         Lessee's obligations, Seitel, Inc. accompanied at Lessor's request by
         the audit report of such guarantor's independent certified public
         accountant, Arthur Anderson & Company, or other such independent
         certified public accountant reasonably acceptable to Lessor.





                                       1
<PAGE>   12
IN WITNESS WHEREOF, parties have executed this Addendum No. One this 20th day
of May 1994.

LESSOR:                                          LESSEE:

MetLife Capital, Limited Partnership             Seitel Geophysical, Inc.
                                                 DBA Eagle Geophysical


By:  /s/ [illegible signature]                   By:  /s/ [illegible signature]
Its:  Sr. Vice President                         Its:  President

                                                 By:
                                                 Its:





                                       2
<PAGE>   13
                               Amendment No. One

Amendment No. One to that certain Master Equipment Lease Agreement dated May
20, 1994, ("Agreement") by and between MetLife Capital, Limited Partnership as
Lessor and Seitel Geophysical, Inc. dba Eagle Geophysical as Lessee.

                              W I T N E S S E T H:

WHEREAS, the parties desire to enter into the Agreement provided that this
Amendment No. One is executed contemporaneously therewith;

NOW THEREFORE, it is agreed as follows:

With respect to this Master Equipment Lease Agreement, the representation and
warranty of Lessee set forth in Paragraph 3(b)(ii) of the Master Equipment
Lease Agreement is hereby amended and restated in its entirety to read as
follows:

         3(b)(ii)         Lessee will provide Lessor with an accurate list of
                          all states in which Equipment is located and shall
                          promptly update this list to reflect any changes or
                          additions. Provided that Lessor (i) has properly
                          filed all UCC-1's and/or similar documents that are
                          required pursuant to the law of the applicable
                          jurisdiction as set forth on the list provided by
                          Lessee, and (ii) has filed or will file any and all
                          required continuation statements and/or similar
                          documents required by the laws of the applicable
                          jurisdiction, the security interest granted to Lessor
                          hereunder will be perfected in accordance with the
                          requirements of all states in which any item of the
                          Equipment is located. Lessee hereby notified Lessor
                          that Equipment is or may be located in the states set
                          forth on Exhibit "A" which is attached hereto and
                          incorporated as a part hereof by this reference.

         3(b)(iii)        Location of Equipment. Lessee will keep the Equipment
                          located in the states set forth on Exhibit "A" as
                          such list may be updated from time to time in
                          accordance with Paragraph 3(b)(ii) above.

         3(b)(iv)         Condition of Leasing Related to Location of
                          Equipment. Lessee shall have executed and delivered
                          to Lessor the Master Equipment Lease Agreement No.
                          One describing the Equipment, and the location of
                          such Equipment shall be the states set forth on
                          Exhibit "A" thereto as such list may be updated from
                          time to time in accordance with Paragraph 3(b)(ii)
                          above.





                                       1
<PAGE>   14
         3(b)(v)          Upon the occurrence of an Event of Default under the
                          Master Equipment Lease Agreement, Lessee shall
                          immediately upon Lessor's request provide Lessor with
                          a current listing of the specific location of each
                          item of Equipment.

IN WITNESS WHEREOF, the parties have executed this Amendment No. One this 20th
day of May, 1994.

LESSOR:                                 LESSEE:

METLIFE CAPITAL, LIMITED                SEITEL GEOPHYSICAL, INC.
PARTNERSHIP                             DBA EAGLE GEOPHYSICAL
By:  MetLife Capital Corporation, 
     General Partner


By:  /s/ [illegible signature]          By:  /s/ [illegible signature]
Its: Sr. Vice President                 Its: President

                                        By: 
                                            ----------------------------------
                                        Its: 
                                             ---------------------------------





                                       2
<PAGE>   15
                                  Exhibit "A"

This Exhibit "A" is attached to and made part of that Amendment No. One to that
certain Master Equipment Lease Agreement dated May 20, 1994 by and between
MetLife Capital, Limited Partnership as Lessor and Seitel Geophysical, Inc. dba
Eagle Geophysical as Lessee.

<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------
  Description                                                            Location          Estimated Cost
  <S>                                                                                             <C>
- ------------------------------------------------------------------------------------------------------------------
  Copiers                                                                                             $4,200.00
- ------------------------------------------------------------------------------------------------------------------
                                                                                                     $36,500.00
- ------------------------------------------------------------------------------------------------------------------
  1994 Polaris Big Boss 6x6 400L ATV (Qty:3)
- ------------------------------------------------------------------------------------------------------------------
  1993 Polaris Big Boss 6x6 350 ATV (Qty:1)
- ------------------------------------------------------------------------------------------------------------------
  1994 Polaris 4x4 400L ATV (Qty:2)
- ------------------------------------------------------------------------------------------------------------------
  1994 Circle M 16 ft flatbed trailer for use w/ATV's (Qty:3)                                         $3,800.00
- ------------------------------------------------------------------------------------------------------------------
  Freight, parts & accessories
- ------------------------------------------------------------------------------------------------------------------
          Total Quotation dated 2/1/94
- ------------------------------------------------------------------------------------------------------------------
  TM51-35/T-100 galvanized dual axle trailer with 100' heavy duty                                    $13,000.00
  aluminum crankup tower (100 ft fixed base antenna mast w/cables)
- ------------------------------------------------------------------------------------------------------------------
  One Opseis Eagle recording system 1300 ch complete                                              $3,878,292.00
- ------------------------------------------------------------------------------------------------------------------
  750 two-group marsh phone cables                                                                  $346,850.00
- ------------------------------------------------------------------------------------------------------------------
  750 two-group land phone cables                                                                   $276,700.00
- ------------------------------------------------------------------------------------------------------------------
  One Mark Products MGA geophone analyzer                                                            $11,000.00
- ------------------------------------------------------------------------------------------------------------------
  TOTAL                                                                                           $4,570,342.00
- ------------------------------------------------------------------------------------------------------------------
</TABLE>





                                       3
<PAGE>   16
                               Amendment No. Two

Amendment No. Two to that certain Master Equipment Lease Agreement dated May
20, 1994, ("Agreement") by and between MetLife Capital, Limited Partnership as
Lessor and Seitel Geophysical, Inc. dba Eagle Geophysical as Lessee.
WITNESSETH:

WHEREAS, the parties entered into the Agreement as aforesaid; and

WHEREAS, the parties now desire to amend the Agreement in certain respects;

NOW, THEREFORE, it is agreed as follows:

Exhibit "A" is deleted in its entirety and replaced with the following:

<TABLE>
<CAPTION>
Description                                                 Location                 Cost    
- --------------------------------------------------------------------------------------------------
<S>                                                         <C>                    <C>
One Opseis Eagle Telemetry Seismic Data                     Hwy 59 South            $3,852,119.00
Acquisition System                                          Rosenberg, TX 77471

One Belarus Engine and One Newage                           same as above               $5,636.23
Generator

Two 1994 Polaris ATV's, Model W948140-                      same as above              $10,000.00
400, 4x4L

Two 1993 Polaris ATV's Model 938739 Big                     same as above              $11,892.50
Boss, 6x6

Two 1994 Polaris ATV's Model W948740 Big                    same as above              $12,292.50
Boss, 6x6

Helmets, Polaris Plugs, Brushguards, Bumpers                same as above               $1,169.64

Three 1994 Circle M. Utility Trailers                       same as above               $3,584.16

(750) Cable strings, MJC 20DX 10-395 Land                   same as above             $229,500.00
70%

(750) Cable strings, MJC 20DX 10-395 1K                     same as above             $358,500.00
Marsh

(750) Geophone Connector Assembly                           same as above              $28,585.00
</TABLE>





                                       1
<PAGE>   17
<TABLE>
<S>                                                         <C>                      <C>
One MGA with hardware, Geophone Analyzer                    same as above              $11,366.25
Test Equipment

(1500) Cable, SNGL 20DX 10-395 1 K 901                      same as above              $48,009.60
Single Marsh Drop with geophones

(141,486) SVL 2-225CB-310/F Gel Cable                       same as above             $134,203.83

(100) 610' Single Drop Cables                               same as above

(150) Cables SCL 4-50-250-F 610' w/molded                   same as above
pigtail at 210'

(100) 610' cables SCL 4-50-250/F Gel Wire                   same as above
w/molded pigtail at 210' ~A" end

(100) cables SCL4-50-250-F Gelled Wire                      same as above
610'w/molded pigtails

(150) cables SCL4-50-250-F Gelled Wire                      same as above
610' w/drop pigtail at 210'

(150) cables SCL 4-50-250 Gelled Wire 61                    same as above
w/pigtail drops at 210'

(250) Cable, SNGL MP24L3 1.82K 1 MTR                        same as above              $73,908.05

One IFR/A7550 Spectrum Analyzer                             107 Corne Road              $8,394.35
                                                            Broussard, LA 70518

(1500) RM2F/PCR Pigtail Cables, 20' BC8222                  same as above              $54,071.19

(742) CA-2001 Interconnect CBL, 610' BC-                    same as above             $157,820.60
1009, w/RM2M/PCR, CFM Eagle Conn.

(40) Wireline Opseis Cable Gel Filled at 10020'             same as above              $17,929.52
w/LTI Connectors

(40) Terminators Cables Gel-Filled at 9" w/L TI             same as above
Connectors

(80) B1167 LTI Female connectors                            same as above

(80) B1143 LTI Male Connectors                              same as above

TOTAL                                                                               $5,018,982.42
</TABLE>





                                       2
<PAGE>   18
IN WITNESS WHEREOF, the parties have executed this Amendment No. Two this 16th
day of September, 1994.

LESSOR:                                      LESSEE:

METLIFE CAPITAL, LIMITED                     SEITEL GEOPHYSICAL, INC.
PARTNERSHIP                                  DBA EAGLE GEOPHYSICAL

By: MetLife Capital Corporation, 
    General Partner

By:  /s/ [illegible signature]               /s/ [illegible signature]
Its: Senior Vice President                   Its: President





                                       3
<PAGE>   19
                      REQUEST TO PURCHASE ADDENDUM NO. One

         THIS ADDENDUM is entered into the 20th day of May, 1994 between
MetLife Capital, Limited Partnership ("Lessor") whose mailing address is
C-97550, Bellevue, Washington 98009 and Seitel Geophysical, Inc. DBA Eagle
Geophysical.  ("Lessee") whose address is 50 Briar Hollow Lane West, 7th Floor,
Houston, Texas 77027.

         Lessee has requested that Lessor purchase the following items of
personal property (individually, an "Item" and, collectively, the "Equipment")
for the prices and for delivery as follows:

<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------
Name and Address                   Complete Description of Equipment
of Supplier         Quantity                                                         Price
- ---------------------------------------------------------------------------------------------------
<S>                                <C>                                                <C>
                                   (New unless otherwise specified) See
                                   Attached Schedule, [  ] check if applicable

To be determined
                                   New Opseis Eagle recording system and
                                   ancillary equipment.




                                   ----------------------------------------------------------------
                                                                   TOTAL PRICE        $4,275,392.00
                                   ----------------------------------------------------------------
                                                                   FED. EXCISE TAX    $
                                   ----------------------------------------------------------------
                                                                   TRANSPORTATION     $
                                   ----------------------------------------------------------------
                                                                   OTHER              $
- ---------------------------------------------------------------------------------------------------
</TABLE>



<TABLE>
<CAPTION>
Date                              Delivery instructions to be                               TOTAL COST: $4,275,392.00
Delivery                          as specified by Lessee
Expected: to be determined        to Supplier                                                                        
- ---------------------------       -----------------------------------------------------------------------------------
                 <S>                       <C>                      <C>              <C>
                 Street                    City                     County           State
</TABLE>

SHIP TO
LESSEE AT:  50 Briar Hollow Lane West, 7th Floor Houston, Harris County Texas  





                                       1
<PAGE>   20
Lessee and Lessor AGREE that subject to the conditions and agreements herein
and in the Master Lease referred to below (i) Lessor shall so purchase the
Equipment, (ii) Lessor shall lease the Equipment to Lessee, and (iii) Lessee
shall lease the Equipment from Lessor and perform and comply with the
provisions of this Agreement.

Certain Definitions and Stipulations:
         Purchase Cut-Off Date: December 31, 1994
         Particular Lease Terms:
            Length of Basic Term: Sixty (60) months
            Interim Rental Rate:  Daily rental factor equivalent
            Periodic Rental Rate (for each installment) 1.79636% percent 
            (%) of Lessor's Cost of the Equipment
            Payment Schedule:  monthly in advance
            Premises where Equipment will be kept: Lessee to provide locations 
                                                   periodically (see Amendment
                                                   No. One to Master Lease)

            Lessee warrants and represents that the Equipment is Five (5) year 
            MACRS property.
            The rental factor will be converted to a simple interest
            equivalent rate that is then increased or decreased 1% for
            each 1% (or pro rata for any fraction of 1 %) change in the
            average yield of 3 year U.S. Treasury Notes (as published in
            Federal Reserve Statistical Release H.15 [5191]) from the
            complete one week period immediately preceding the date of
            this proposal and the complete one week period immediately
            preceding date of lease closing. The average yield for the
            week prior to the proposal was 4.43%

Insurance Required:
         Liability. Not less than $1,000,000.00 Combined Single Limit Liability
         insurance, including bodily injury and death and property damage,
         naming Lessor as additional insured.
         Physical Damage. Not less than $4,278,792.00 All risk physical damage
         insurance, including loss by burglary, theft, and malicious mischief,
         for full replacement value of the equipment, naming Lessor as loss
         payee.  
         Other: N/A

Stipulated Loss Factors:
                 First Year    102.53604%
                 Second Year    87.43912%
                 Third Year     70.87822%
                 Fourth Year    53.06907%
                 Fifth Year     34.06900%

 *A "Lease Year" is a twelve-month period beginning on the Closing Date or on
                           any anniversary thereof.

Master Lease:         Lessor and Lessee are entering into or have entered into a
Master Equipment Lease Agreement ("Master Lease") dated May 20, 1994.  All of
the terms, conditions, agreements and provisions of the Master Lease are
incorporated herein by finis reference and constitute a part of this Addendum.
If there shall be any conflict between any provision of the Master Lease and a
provision of this Addendum, the provision of the Addendum shall govern.

Lessor's Disclaimer:  Lessee acknowledges and agrees that it has selected
both the Equipment of the type and quantity which is the subject of this
Addendum and the supplier from whom Lessor purchased the Equipment.  LESSOR
MAKES NO REPRESENTATION OR WARRANTY, EXPRESS OR IMPLIED, AS TO THE DESIGN,
COMPLIANCE WITH SPECIFICATIONS, CONDITION, QUALITY, WORKMANSHIP, OR THE
SUITABILITY, ADEQUACY, OPERATION, USE OR PERFORMANCE OF THE EQUIPMENT OR AS TO
ITS MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.  ANY DELAY IN
DELIVERY SHALL NOT AFFECT THE VALIDITY OF THE MASTER LEASE OR THIS ADDENDUM.
The Lessee understands and agrees that neither the supplier nor any salesman
nor any agent of the supplier is authorized to waive or alter any term or
condition of the Master Lease or this Addendum, and no representation as to the
Equipment or any other matter by the supplier shall in any way affect Lessee's
duty to pay the rent and perform its obligations as set forth in the Master
Lease or this Addendum.  Lessor shall not be liable to Lessee for incidental,
consequential, or indirect damages or for any act, neglect omission, breach or
default by any third party.
                                        
LESSOR:                                   LESSEE:

METLIFE CAPITAL, LIMITED PARTNERSHIP      SEITEL GEOPHYSICAL, INC.
                                          DBA EAGLE GEOPHYSICAL
By: MetLife Capital Corporation, 
    General Partner

By:  /s/ [illegible signature]            By:  /s/ [illegible signature]
Its: Sr. Vice President                   Its: President

                                          By:
                                          Its:





                                       2
<PAGE>   21
                               AMENDMENT NO. ONE

         AMENDMENT NO. ONE to that certain Master Equipment Lease Agreement
("Lease") dated May 20, 1994 and only with respect to Request to Purchase
Addendum No. One by and between MetLife Capital, Limited Partnership ("Lessor")
and Seitel Geophysical, Inc. DBA Eagle Geophysical ("Lessee").

                              W I T N E S S E T H

Section 16(a) Purchase Option is deleted in its entirety and replaced with the
following:

         "Lessee may purchase all, but not less than all of the Equipment on
         the last day of the Term (the Option Date"), for cash, at the
         Equipment's then Fair Market Value or Ten percent (10%) of the
         original Equipment Cost, whichever is greater, provided Lessee is not
         then in breach or default and the Lessee gives Lessor written notice
         of election to purchase at least sixty (60) days prior to the Option
         Date. Upon payment of the purchase price and all rentals and other
         services owing or to become owing to and including the Option Date,
         Lessor shall transfer to Lessee all of Lessor's rights, title and
         interest in the Equipment, in its then condition, without any
         representation or warranty other than the warranty that the Equipment
         is not subject to any liens resulting from acts of Lessor. For
         purposes of this Lease, the term "Fair Market Value" shall be an
         amount agreed upon by Lessor and Lessee or if such parties are unable
         to agree prior to the Option Date, such value shall be determined by
         an appraiser chosen by mutual agreement. Lessee shall pay the fees and
         expenses of the appraiser. If Lessee elects not to purchase the
         Equipment on the last day of the Term then lessee shall exercise the
         renewal option as stated in paragraph 16(b). At the end of the initial
         renewal period stated in paragraph 16(b) or any subsequent renewal
         period Lessee may purchase all but not less than all of the Equipment
         for cash at the Equipment's then Fair Market Value provided Lessee is
         not then in breach or default and gives Lessor at least sixty (60)
         days prior written notice."

Section 1 6(b) Renewal Option is deleted in its entirety and replaced with the
following:

         "At the end of the Term, provided there shall be no breach or default
         by Lessee or event which with the giving of notice or passage of time,
         or both, might mature into event of default and provided Lessee has
         not exercised the purchase option as stated above in paragraph 16(a),
         then Lessee shall exercise a renewal option with respect to all but
         not less than all the Equipment for a period of Twelve (12) months
         beginning with the expiration of the Term at a Periodic Rental Rate of
         .85095% per month. At the expiration of this initial Twelve (12) month
         renewal period, and provided there shall be no breach or default by
         Lessee or event which with the giving of notice or passage of time, or
         both, might mature into an event of default, and provided Lessee
         notifies Lessor of its election to renew, in writing at least sixty
         (60) days prior to the expiration of the initial Twelve (12) month
         period, Lessee shall have the right to renew the Lease with respect to
         all but not less than all of the Equipment on an annual basis for its
         then Fair Market Rental Value as determined below. If the parties
         shall not have agreed upon the rental for the renewal period prior to
         the commencement thereof, then the fair market value shall be
         determined by an independent appraiser selected by mutual agreement;
         Lessee shall pay rental installments based on Lessor's estimate of
         fair market rental value until the rental is determined by appraisal
         or otherwise, at which time appropriate additional payment or credits
         shall be made or given. Lessee shall pay the fees and expenses of the
         appraiser. All provisions of the Lease shall continue in full force
         and effect during the initial Twelve (N) month renewal period and any
         subsequent renewal term except for the amount of the rental during any
         subsequent renewal term."





                                       1
<PAGE>   22
IN WITNESS WHEREOF, the parties have executed this Amendment No. One this 20th
day of May, 1994.
                                          
METLIFE CAPITAL, LIMITED PARTNERSHIP      Seitel Geophysical Inc. DBA Eagle
                                          Geophysical

By:  MetLife Capital Corporation          By:  /s/ [illegible signature]
Its: General Partner                      Its: President


By:  /s/ [illegible signature]            By: 
                                             ----------------------------------
Its: Sr. Vice President                   Its:                                 
                                              ---------------------------------





                                       2
<PAGE>   23
                               AMENDMENT NO. TWO

         Amendment No. TWO to that certain Request to Purchase Addendum No. One
dated May 20, 1994 ("Agreement") by and between Seitel Geophysical, Inc. dba
Eagle Geophysical as Lessee and MetLife Capital, Limited Partnership as Lessor.

                              W I T N E S S E T H:

         WHEREAS, the parties entered into the Agreement as aforesaid; and

         WHEREAS, the parties now desire to amend the Agreement in certain
respects;

         NOW, THEREFORE, it is agreed as follows:


         The purchase price of the equipment is decreased to $3,852,119.00.

         The renewal period stated in Section 16(b) is reduced from twelve (12)
months to eight (8) months.

         IN WITNESS WHEREOF, the parties have executed the Amendment No. TWO
this 16th day of September, 1994.

LESSOR:                                 LESSEE:
                                        
METLIFE CAPITAL, LIMITED                SEITEL GEOPHYSICAL, INC.
PARTNERSHIP                             DBA EAGLE GEOPHYSICAL
By:  MetLife Capital Corporation, 
     General Partner


By:  /s/ [illegible signature]          By:  /s/ [illegible signature]
Its: Senior Vice President              Its: President





                                       1
<PAGE>   24
                      REQUEST TO PURCHASE ADDENDUM NO. TWO

         THIS ADDENDUM is entered into the 20th day of May, 1994 between
MetLife Capital, Limited Partnership ("Lessor") whose mailing address is
C-97550, Bellevue, Washington 98009 and Seitel Geophysical, Inc. DBA Eagle
Geophysical.  ("Lessee") whose address is 50 Briar Hollow Lane West, 7th Floor,
Houston, Texas 77027.

         Lessee has requested that Lessor purchase the following items of
personal property (individually, an "Item" and, collectively, the "Equipment")
for the prices and for delivery as follows:

<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------
  Name and Address                   Complete Description of Equipment
  of Supplier          Quantity                                                        Price
- ---------------------------------------------------------------------------------------------------
  <S>                                <C>                                                <C>
                                     (New unless otherwise specified) See
                                     Attached Schedule, [  ] check if applicable

  To be determined
                                     New All Terrain Vehicles, Cable Strings
                                     and attachments




                                     --------------------------------------------------------------
                                                                     TOTAL PRICE        $700,000.00
                                     --------------------------------------------------------------
                                                                     FED. EXCISE TAX    $
                                     --------------------------------------------------------------
                                                                     TRANSPORTATION     $
                                     --------------------------------------------------------------
                                                                     OTHER              $
- ---------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>
                                                                                                                         
- --------------------------------------------------------------------------------------------------------------------
Date                              Delivery instructions to be                              TOTAL COST: $4,275,392.00
Delivery                          as specified by Lessee
Expected: to be determined        to Supplier                                                                       
- --------------------------------------------------------------------------------------------------------------------
                 <S>                       <C>                      <C>              <C>
                 Street                    City                     County           State
</TABLE>

SHIP TO
LESSEE AT: 50 Briar Hollow Lane West, 7th Floor Houston, Harris County Texas   





                                       1
<PAGE>   25
Lessee and Lessor AGREE that subject to the conditions and agreements herein
and in the Master Lease referred to below (i) Lessor shall so purchase the
Equipment, (ii) Lessor shall lease the Equipment to Lessee, and (iii) Lessee
shall lease the Equipment from Lessor and perform and comply with the
provisions of this Agreement.

Certain Definitions and Stipulations:
         Purchase Cut-Off Date: December 31, 1994
         Particular Lease Terms:
            Length of Basic Term: Thirty Six (36) months
            Interim Rental Rate: Daily rental factor equivalent
            Periodic Rental Rate (for each installment) 2.81507% percent
            (%) of Lessor's Cost of the Equipment 
            Payment Schedule: monthly in advance
            Premises where Equipment will be kept: Lessee to provide locations 
                                                   periodically (see Amendment 
                                                   No. One to Master Lease)

            Lessee warrants and represents that the Equipment is Five (5) year 
            MACRS property.
            The rental factor will be converted to a simple interest
            equivalent rate that is then increased or deceased 1% for each
            1% (or pro rata for any fraction of 1%) change in the average
            yield of 3 year U.S.  Treasury Notes (as published in Federal
            Reserve Statistical Release H.15 [5191) from the complete one
            week period immediately preceding the date of this proposal
            and the complete one week period immediately preceding date of
            lease closing. The average yield for the week prior to the
            proposal was 4.43

Insurance Required:
         Liability. Not less than $1,000,000.00 Combined Single Limit Liability
         insurance, including bodily injury and death and property damage,
         naming Lessor as additional insured.
         Physical Damage. Not less than $700,000.00 All risk physical damage
         insurance, including loss by burglary, theft, and malicious mischief,
         Or full replacement value of the equipment, naming Lessor as loss
         payee.
         Other: N/A

Stipulated Loss Factors:
         First Year              103.2069%
         Second Year              75.5369%
         Third Year              45.77257%

 *A "Lease Year" is a twelve-month period beginning on the Closing Date or on
                           any anniversary thereof.

Master Lease:         Lessor and Lessee are entering into or have entered into a
Master Equipment Lease Agreement ("Master Lease") dated May 20, 1994.  All of
the terms, conditions, agreements and provisions of the Master Lease are
incorporated herein Within reference and constitute a part of this Addendum.
If there shall be any conflict between any provision of the Master Lease and a
provision of this Addendum, the provision of the Addendum shall govern.

Lessor's Disclaimer:  Lessee acknowledges and agrees that it has selected
both the Equipment of the type and quantity which is the subject of this
Addendum and the supplier from whom Lessor purchased the Equipment LESSOR MAKES
NO REPRESENTATION OR WARRANTY, EXPRESS OR IMPLIED, AS TO THE DESIGN, COMPLIANCE
WITH SPECIFICATIONS, CONDITION, QUALITY, WORKMANSHIP, OR THE SUITABILITY,
ADEQUACY, OPERATION, USE OR PERFORMANCE OF THE EQUIPMENT OR AS TO ITS
MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. ANY DELAY IN DELIVERY
SHAWL NOT AFFECT THE VALIDITY OF THE MASTER LEASE OR THIS ADDENDUM. The Lessee
understands and agrees that neither the supplier nor any salesman nor any agent
of the supplier is authorized to waive or alter any term or condition of the
Master Lease or this Addendum, and no representation as to the Equipment or any
other matter by the supplier shall in any way affect Lessee's dud to pay Me
rent and perform its obligations as set forth in the Master Lease or this
Addendum. Lessor shall not be liable to Lessee for incidental, consequential,
or indirect damages or for any act, neglect omission, breach or default by any
third party.

LESSOR:                                   LESSEE:
                                          
METLIFE CAPITAL, LIMITED PARTNERSHIP      SEITEL GEOPHYSICAL, INC.
                                          DBA EAGLE GEOPHYSICAL
By: MetLife Capital Corporation, 
General Partner

By:  /s/ [illegible signature]            By:  /s/ [illegible signature]
Its: Sr. Vice President                   Its: President

                                          By: 
                                             ----------------------------------
                                          Its:                                 
                                              ---------------------------------





                                       2
<PAGE>   26



                               AMENDMENT NO. ONE

         AMENDMENT NO. ONE to that certain Master Equipment Lease Agreement
("Lease") dated May 20, 1994 and only with respect to Request to Purchase
Addendum No. Two by and between MetLife Capital, Limited Partnership ("Lessor")
and Seitel Geophysical, Inc. DBA Eagle Geophysical ("Lessee").

                              W I T N E S S E T H

Section 16(a) Purchase Option is deleted in its entirety and replaced with the
following:

         "Lessee may purchase all, but not less than all of the Equipment on
         the last day of the Term (the "Option Date"), for cash, at the
         Equipment's then Fair Market Value or Ten percent (10%) of the
         original Equipment Cost, whichever is greater, provided Lessee is not
         then in breach or default and the Lessee gives Lessor written notice
         of election to purchase at least sixty (60) days prior to the Option
         Date. Upon payment of the purchase price and all rentals and other
         services owing or to become owing to and including the Option Date,
         Lessor shall transfer to Lessee all of Lessor's rights, title and
         interest in the Equipment, in its then condition, without any
         representation or warranty other than the warranty that the Equipment
         is not subject to any liens resulting from acts of Lessor. For
         purposes of this Lease, the term "Fair Market Value" shall be an
         amount agreed upon by Lessor and Lessee or if such parties are unable
         to agree prior to the Option Date, such value shall be determined by
         an appraiser chosen by mutual agreement. Lessee shall pay the fees and
         expenses of the appraiser. If Lessee elects not to purchase the
         Equipment on the last day of the Term then lessee shall exercise the
         renewal option as stated in paragraph 16(b). At the end of the initial
         renewal period stated in paragraph 16(b) or any subsequent renewal
         period Lessee may purchase all but not less than all of the Equipment
         for cash at the Equipment's then Fair Market Value provided Lessee is
         not then in breach or default and gives Lessor at least sixty (60)
         days prior written notice."

Section 16(b) Renewal Option is deleted in its entirety and replaced with the
following:

         "At the end of the Term, provided there shall be no breach or default
         by Lessee or event which with the giving of notice or passage of time,
         or both, might mature into event of default and provided Lessee has
         not exercised the purchase option as stated above in paragraph 16(a),
         then Lessee shall exercise a renewal option with respect to all but
         not less than all the Equipment for a period of Twelve (12) months
         beginning with the expiration of the Term at a Periodic Rental Rate of
         .88102% per month. At the expiration of this initial Twelve (12) month
         renewal period, and provided there shall be no breach or default by
         Lessee or event which with the giving of notice or passage of time, or
         both, might mature into an event of default, and provided Lessee
         notifies Lessor of its election to renew, in writing at least sixty
         (60) days prior to the expiration of the initial Twelve (12) month
         period, Lessee shall have the right to renew the Lease with respect to
         all but not less than all of the Equipment on an annual basis for its
         then Fair Market Rental Value as determined below. If the parties
         shall not have agreed upon the rental for the renewal period prior to
         the commencement thereof, then the fair market value shall be
         determined by an independent appraiser selected by mutual agreement;
         Lessee shall pay rental installments based on Lessor's estimate of
         fair market rental value until the rental is determined by appraisal
         or otherwise, at which time appropriate additional payment or credits
         shall be made or given. Lessee shall pay the fees and expenses of the
         appraiser. All provisions of the Lease shall continue in full force
         and effect during the initial Twelve (12) month renewal period and any
         subsequent renewal term except for the amount of the rental during any
         subsequent renewal term."





                                       1
<PAGE>   27
IN WITNESS WHEREOF, the parties have executed this Amendment No. One this 20th
day of May, 1994.
                                          
METLIFE CAPITAL, LIMITED PARTNERSHIP      Seitel Geophysical Inc. DBA Eagle
                                          Geophysical

By:  MetLife Capital Corporation          By:  /s/ [illegible signature]
Its: General Partner                      Its: President


By:  /s/ [illegible signature]            By: 
                                             ----------------------------------
Its: Sr. Vice President                   Its:                                 
                                              ---------------------------------





                                       2
<PAGE>   28


                               AMENDMENT NO. TWO

         Amendment No. TWO to that certain Request to Purchase Addendum No. Two
dated May 20, 1994 ("Agreement") by and between Seitel Geophysical, Inc. dba
Eagle Geophysical as Lessee and MetLife Capital, Limited Partnership as Lessor.

                                  WITNESSETH:

         WHEREAS, the parties entered into the Agreement as aforesaid; and

         WHEREAS, the parties now desire to amend the Agreement in certain
respects;

         NOW, THEREFORE, it is agreed as follows:

         The purchase price of the equipment is increased to $1,166,863.42.

         Physical Damage insurance must be provided at an amount not less than
$1,166,863.42.

         The renewal period stated in Section 16(b) is reduced from twelve (12)
months to eight (8) months.

         IN WITNESS WHEREOF, the parties have executed the Amendment No. TWO
this 16th day of September, 1994.

LESSOR:                                   LESSEE:
                                          
METLIFE CAPITAL, LIMITED                  SEITEL GEOPHYSICAL, INC.
PARTNERSHIP                               DBA EAGLE GEOPHYSICAL
By: MetLife Capital Corporation, 
    General Partner


By:  /s/ [illegible signature]            By:  /s/ [illegible signature]
Its: Senior Vice President                Its: President





                                       1
<PAGE>   29
                             LEASE CLOSING SCHEDULE

Lessee Name:              Seitel Geophysical, Inc. dba Eagle Geophysical
Equipment Lease No.:      1004194
Dated:                    May 20, 1994
Schedule No.:             001
Closing Date:             July 29 , 1994

1.       Description of Equipment:

         One (1) Opseis Eagle Telemetry Seismic Data Acquisition System

2.       Location of Equipment: (Lessee agrees that the Equipment will at all
         times remain in the possession and control of Lessee at the
         location(s) specified below, and will not be removed without Lessor's
         prior written consent.)

         Hwy 59 South
         Rosenberg, TX 77471

3.       Total Equipment Cost:    $3,852,119.00

4.       Periodic Rent:
         The total sum of $4,348,934.40
         Dollars in sixty (60) installments of $72,482.24 plus applicable sales
         taxes
         Dollars each, payable commencing on July 29, 1994 and at monthly
         intervals thereafter.

5.       Purchase Option

         "Lessee may purchase all, but not less than all of the Equipment on
         the last day of the Term (the "Option Date"), for cash, at the
         Equipment's then Fair Market Value or Ten percent (10%) of the
         original Equipment Cost, whichever is greater, provided Lessee is not
         then in breach or default and the Lessee gives Lessor written notice
         of election to purchase at least sixty (60) days prior to the Option
         Date. Upon payment of the purchase price and all rentals and other
         services owing or to become owing to and including the Option Date,
         Lessor shall transfer to Lessee all of Lessor's rights, title and
         interest in the Equipment, in its then condition, without any
         representation or warranty other than the warranty that the Equipment
         is not subject to any liens resulting from acts of Lessor. For
         purposes of this Lease, the term "Fair Market Value" shall be an
         amount agreed upon by Lessor and Lessee or if such parties are unable
         to agree prior to the Option Date, such value shall be determined by
         an appraiser chosen by mutual agreement. Lessee shall pay the fees and
         expenses of the appraiser. If Lessee elects not to purchase the
         Equipment on the last day of the Term then lessee shall exercise the
         renewal option as stated in paragraph 16(b). At the end of the initial
         renewal period stated in paragraph 16(b) or any subsequent renewal
         period Lessee may purchase all but not less than all of the Equipment
         for cash at the Equipment's then Fair Market Value provided Lessee is
         not then in breach or default and gives Lessor at least sixty (60)
         days prior written notice.

6.       Renewal Option

         At the end of the Term, provided there shall be no breach or default
         by Lessee or event which with the giving of notice or passage of time,
         or both, might mature into event of default and provided Lessee has
         not exercised the purchase option as stated above in paragraph 16(a),
         then Lessee shall exercise a renewal option with respect to all but
         not less than all the Equipment for a period of twelve (12) months
         beginning





                                       1
<PAGE>   30
         with the expiration of the Term at a Periodic Rental Rate of 0.94081%
         per month.  At the expiration of this initial twelve (12) month
         renewal period, and provided there shall be no breach or default by
         Lessee or event which with the giving of notice or passage of time, or
         both, might mature into an event of default, and provided Lessee
         notifies Lessor of its election to renew, in writing at least sixty
         (60) days prior to the expiration of the initial twelve (12) month
         period, Lessee shall have the right to renew the Lease with respect to
         all but not less than all of the Equipment on an annual basis for its
         then Fair Market Rental Value as determined below. If the parties
         shall not have agreed upon the rental for the renewal period prior to
         the commencement thereof, then the fair market value shall be
         determined by an independent appraiser selected by mutual agreement;
         Lessee shall pay rental installments based on Lessor's estimate of
         fair market rental value until the rental is determined by appraisal
         or otherwise, at which time appropriate additional payment or credits
         shall be made or given. Lessee shall pay the fees and expenses of the
         appraiser. All provisions of the Lease shall continue in full force
         and effect during the initial twelve (12) month renewal period and any
         subsequent renewal term except for the amount of the rental during any
         subsequent renewal term.

7.       Insurance Required (All policies to require at lease 10 days' notice
         of cancellation to Lessor):

         a.      Combined Single Limit Liability, including bodily injury and
                 property damage, of not less than $1,000,000.00 naming Lessor
                 as additional insured.

         b.      All risk physical damage, including burglary and theft, for
                 the full replacement value of the equipment, based on the
                 original equipment cost of $3,852,119.00 and Loss Payable
                 Endorsement naming Lessor as loss payee.

         c.      Other: 

8.       Stipulated Loss Values:

                 First Year:      102.7078%        Fourth Year:      54.2477%
                 Second Year:      88.3686%        Fifth Year:      34.87919
                 Third Year:       72.1251%

Accepted and agreed this 27th day of July, 1994 as Schedule No. One to that
certain Master Equipment Lease Agreement dated May 20, 1994 by and between the
parties hereto.
                                          
LESSOR:                                   LESSEE:
                                          SEITEL GEOPHYSICAL, INC. DBA EAGLE
METLIFE CAPITAL, LIMITED PARTNERSHIP      GEOPHYSICAL


By:  MetLife Capital Corporation          By:  /s/ [illegible signature]
Its: General Partner                      Its: President


By:  /s/ [illegible signature]
Its: Vice President





                                       2
<PAGE>   31
                             LEASE CLOSING SCHEDULE

Lessee Name:              Seitel Geophysical, Inc. dba Eagle Geophysical
Equipment Lease No.:      1004194
Dated:                    May 20, 1994
Schedule No.:             002
Closing Date:             July 7, 1994

1.       Description of Equipment:

         ATV's, Engine and Generator more fully described on the attached
         Exhibit "A" herein incorporated by this reference.

2.       Location of Equipment: (Lessee agrees that the Equipment will at all
         times remain in the possession and control of Lessee at the
         location(s) specified below, and will not be removed without Lessor's
         prior written consent.)

         Hwy 59 South
         Rosenberg, TX 77471

3.       Total Equipment Cost:    $40,990.87

4.       Periodic Rent:
         The total sum of $42,776.64
         Dollars in thirty-six (36) installments of $1,188.24 plus applicable
         sales taxes
         Dollars each, payable commencing on July 7, 1994 and at monthly
         intervals thereafter.

5.       Purchase Option

         "Lessee may purchase all, but not less than all of the Equipment on
         the last day of the Term (the "Option Date"), for cash, at the
         Equipment's then Fair Market Value or Ten percent (10%) of the
         original Equipment Cost, whichever is greater, provided Lessee is not
         then in breach or default and the Lessee gives Lessor written notice
         of election to purchase at least sixty (60) days prior to the Option
         Date. Upon payment of the purchase price and all rentals and other
         services owing or to become owing to and including the Option Date,
         Lessor shall transfer to Lessee all of Lessor's rights, title and
         interest in the Equipment, in its then condition, without any
         representation or warranty other than the warranty that the Equipment
         is not subject to any liens resulting from acts of Lessor. For
         purposes of this Lease, the term "Fair Market Value" shall be an
         amount agreed upon by Lessor and Lessee or if such parties are unable
         to agree prior to the Option Date, such value shall be determined by
         an appraiser chosen by mutual agreement. Lessee shall pay the fees and
         expenses of the appraiser. If Lessee elects not to purchase the
         Equipment on the last day of the Term then lessee shall exercise the
         renewal option as stated in paragraph 16(b). At the end of the initial
         renewal period stated in paragraph 16(b) or any subsequent renewal
         period Lessee may purchase all but not less than all of the Equipment
         for cash at the Equipment's then Fair Market Value provided Lessee is
         not then in breach or default and gives Lessor at least sixty (60)
         days prior written notice.

6.       Renewal Option

         At the end of the Term, provided there shall be no breach or default
         by Lessee or event which with the giving of notice or passage of time,
         or both, might mature into event of default and provided Lessee has
         not exercised the purchase option as stated above in paragraph 16(a),
         then Lessee shall exercise a renewal option with respect to all but
         not less than all the Equipment for a period of eight (8) months
         beginning with the expiration of the Term at a Periodic Rental Rate of
         1.4494% per month.  At the expiration of this





                                       1
<PAGE>   32
         initial eight (8) month renewal period, and provided there shall be no
         breach or default by Lessee or event which with the giving of notice
         or passage of time, or both, might mature into an event of default,
         and provided Lessee notifies Lessor of its election to renew, in
         writing at least sixty (60) days prior to the expiration of the
         initial eight (8) month period, Lessee shall have the right to renew
         the Lease with respect to all but not less than all of the Equipment
         on an annual basis for its then Fair Market Rental Value as determined
         below. If the parties shall not have agreed upon the rental for the
         renewal period prior to the commencement thereof, then the fair market
         value shall be determined by an independent appraiser selected by
         mutual agreement; Lessee shall pay rental installments based on
         Lessor's estimate of fair market rental value until the rental is
         determined by appraisal or otherwise, at which time appropriate
         additional payment or credits shall be made or given. Lessee shall pay
         the fees and expenses of the appraiser. All provisions of the Lease
         shall continue in full force and effect during the initial eight (8)
         month renewal period and any subsequent renewal term except for the
         amount of the rental during any subsequent renewal term.

7.       Insurance Required (All policies to require at lease 10 days' notice
         of cancellation to Lessor):

         a.      Combined Single Limit Liability, including bodily injury and
                 property damage, of not less than $1,000,000.00 naming Lessor
                 as additional insured.

         b.      All risk physical damage, including burglary and theft, for
                 the full replacement value of the equipment, based on the
                 original equipment cost of $40,990.87 and Loss Payable
                 Endorsement naming Lessor as loss payee.

         c.      Other: 

8.       Stipulated Loss Values:

                 First Year:      103.3529%
                 Second Year:      76.1357%
                 Third Year:       46.3118%

Accepted and agreed this 25th day of July, 1994 as Schedule No. One to that
certain Master Equipment Lease Agreement dated May 20, 1994 by and between the
parties hereto.
                                          
LESSOR:                                   LESSEE:
                                          SEITEL GEOPHYSICAL, INC. DBA EAGLE
METLIFE CAPITAL, LIMITED PARTNERSHIP      GEOPHYSICAL

                                          
By:  MetLife Capital Corporation          By:  /s/ [illegible signature]
Its: General Partner                      Its: President


By:  /s/ [illegible signature]
Its: Vice President





                                       2
<PAGE>   33
                This Exhibit "A" is attached to and made a part
       of that Lease Closing Schedule for the transaction by and between
               MetLife Capital, Limited Partnership as Lessor and
            Seitel Geophysical, Inc. dba Eagle Geophysical as Lessee

<TABLE>
<CAPTION>
Vendor/Invoice                    Equipment Description                              Equipment Cost
<S>                               <C>                                                  <C>
Diesel Engine Center/L42221       One (1) Belarus Engine, SN 2984267Z                   3,370 .00
                                  One (1) Newage Generator, SN C041234/05               1,873 .00
                                  Sales Tax                                               393 .23

Sammy Broussard's Lawn
& Tractor
3231                              One (1) 1994 Polaris ATV, Model W948140-400,          5,000 .00
                                  4x4L, SN 2266344, Engine Model No. 38PL01,
                                  Engine SN 9400147, Ignition Key 3110

3232                              One (1) 1994 Polaris ATV, Model W948140-400,          5,000 .00
                                  4x4L, SN 2268384, Engine Model No. 38PL01,
                                  Engine SN 9402472, Ignition Key 3213

3233                              One (1) 1993 Polaris ATV, Model W938739 Big           5,946 .25
                                  Boss 6x6, SN 2105475, Engine Model No. 35PL02,
                                  Engine SN 9328787, Ignition Key 3132

3234                              One (1) 1993 Polaris ATV, Model W938739 Big           5,946 .25
                                  Boss 6x6, SN 2104563, Engine Model No. 35PL02,
                                  Engine SN 9320918, Ignition Key 3108

3235                              One (1) 1994 Polaris ATV, Model W948740 Big           6,146 .25
                                  Boss 6x6, SN 2268972, Engine Model No. 38PL01,
                                  Engine SN 9403930, Ignition Key 3231

3236                              One (1) 1994 Polaris ATV, Model W948740 Big           6,146 .25
                                  Boss 6x6, SN 2269645, Engine Model No. 38PL01,
                                  Engine SN 9405790, Ignition Key 3128

N000000                           (6) Helmets, Oil, Polaris Plugs, Brushguards,         1,169 .64
                                  Aluminum bumpers

                                                   TOTAL 1004194-002                   40,990 .87
</TABLE>





                                       3
<PAGE>   34
                             LEASE CLOSING SCHEDULE

Lessee Name:              Seitel Geophysical, Inc. dba Eagle Geophysical
Equipment Lease No.:      1004194
Dated:                    May 20, 1994
Schedule No.:             003
Closing Date:             July 7, 1994

1.       Description of Equipment:

         Three (3) 1994 Circle M Utility Trailers, 8 x 18 ft long, GVWR 7000
         Ibs, VIN #s 1C9US1829RM364019, 1 C9US1825RM364020, 1 C9US1827RM364021

2.       Location of Equipment: (Lessee agrees that the Equipment will at all
         times remain in the possession and control of Lessee at the
         location(s) specified below, and will not be removed without Lessor's
         prior written consent.)

         Hwy. 59 South
         Rosenberg, TX 77471

3.       Total Equipment Cost:    $3,584.16

4.       Periodic Rent:
         The total sum of $3,740.40
         Dollars in thirty six (36) installments of $103.90
         Dollars each, payable commencing on July 7, 1994 and at monthly
         intervals thereafter.

5.       Purchase Option

         "Lessee may purchase all, but not less than all of the Equipment on
         the last day of the Term (the "Option Date"), for cash, at the
         Equipment's then Fair Market Value or Ten percent (10%) of the
         original Equipment Cost, whichever is greater, provided Lessee is not
         then in breach or default and the Lessee gives Lessor written notice
         of election to purchase at least sixty (60) days prior to the Option
         Date. Upon payment of the purchase price and all rentals and other
         services owing or to become owing to and including the Option Date,
         Lessor shall transfer to Lessee all of Lessor's rights, title and
         interest in the Equipment, in its then condition, without any
         representation or warranty other than the warranty that the Equipment
         is not subject to any liens resulting from acts of Lessor. For
         purposes of this Lease, the term "Fair Market Value" shall be an
         amount agreed upon by Lessor and Lessee or if such parties are unable
         to agree prior to the Option Date, such value shall be determined by
         an appraiser chosen by mutual agreement. Lessee shall pay the fees and
         expenses of the appraiser. If Lessee elects not to purchase the
         Equipment on the last day of the Term then lessee shall exercise the
         renewal option as stated in paragraph 16(b). At the end of the initial
         renewal period stated in paragraph 16(b) or any subsequent renewal
         period Lessee may purchase all but not less than all of the Equipment
         for cash at the Equipment's then Fair Market Value provided Lessee is
         not then in breach or default and gives Lessor at least sixty (60)
         days prior written notice.

6.       Renewal Option

         At the end of the Term, provided there shall be no breach or default
         by Lessee or event which with the giving of notice or passage of time,
         or both, might mature into event of default and provided Lessee has
         not exercised the purchase option as stated above in paragraph 16(a),
         then Lessee shall exercise a renewal option with respect to all but
         not less than all the Equipment for a period of eight (8) months
         beginning





                                       1
<PAGE>   35
         with the expiration of the Term at a Periodic Rental Rate of 1.4494%
         per month. At the expiration of this initial eight (8) month renewal
         period, and provided there shall be no breach or default by Lessee or
         event which with the giving of notice or passage of time, or both,
         might mature into an event of default, and provided Lessee notifies
         Lessor of its election to renew, in writing at least sixty (60) days
         prior to the expiration of the initial eight (8) month period, Lessee
         shall have the right to renew the Lease with respect to all but not
         less than all of the Equipment on an annual basis for its then Fair
         Market Rental Value as determined below. If the parties shall not have
         agreed upon the rental for the renewal period prior to the
         commencement thereof, then the fair market value shall be determined
         by an independent appraiser selected by mutual agreement; Lessee shall
         pay rental installments based on Lessor's estimate of fair market
         rental value until the rental is determined by appraisal or otherwise,
         at which time appropriate additional payment or credits shall be made
         or given. Lessee shall pay the fees and expenses of the appraiser. All
         provisions of the Lease shall continue in full force and effect during
         the initial eight (8) month renewal period and any subsequent renewal
         term except for the amount of the rental during any subsequent renewal
         term.

7. Insurance Required (All policies to require at lease 10 days' notice of
   cancellation to Lessor):

         a.      Combined Single Limit Liability, including bodily injury and
                 property damage, of not less than $1,000,000.00 naming Lessor
                 as additional insured.

         b.      All risk physical damage, including burglary and theft, for
                 the full replacement value of the equipment, based on the
                 original equipment cost of $3,584.16 and Loss Payable
                 Endorsement naming Lessor as loss payee.

         c.      Other:

8.       Stipulated Loss Values:

                 First Year:      103.3529%
                 Second Year:      76.1357%
                 Third Year:       46.3118%

Accepted and agreed this 25th day of July, 1994 as Schedule No. Three to that
certain Master Equipment Lease Agreement dated May 20, 1994 by and between the
parties hereto.
                                          
LESSOR:                                   LESSEE:
                                          SEITEL GEOPHYSICAL, INC. DBA EAGLE
METLIFE CAPITAL, LIMITED PARTNERSHIP      GEOPHYSICAL


By:  MetLife Capital Corporation          By:  /s/ [illegible signature]
Its: General Partner                      Its: President


By:  /s/ [illegible signature]
Its: Vice President





                                       2
<PAGE>   36
                             LEASE CLOSING SCHEDULE

Lessee Name:              Seitel Geophysical, Inc. dba Eagle Geophysical
Equipment Lease No.:      1004194
Dated:                    May 20, 1994
Schedule No.:             004
Closing Date:             July 25 ,1994

1.       Description of Equipment:
         One (1) IFR/A7550 Spectrum Analyzer, SN #2864                 8,394 .35
         (1,500) RM2F/PCR Pigtail Cables, 20' BC822,                  54,071 .19
         One (1) Interconnect Cable 610", BC-1009, CFM Eagle Conn.       218 .60
                                  Total                               $62,684.14

2.       Location of Equipment: (Lessee agrees that the Equipment will at all
         times remain in the possession and control of Lessee at the
         location(s) specified below, and will not be removed without Lessor's
         prior written consent.)

         107 Corne Road
         Broussard, LA 70518

3.       Total Equipment Cost:    $62,684.14

4.       Periodic Rent:
         The total sum of $65,480.76
         Dollars in thirty six (36) installments of $1,818.91 plus applicable
         sales taxes
         Dollars each, payable commencing on July 25, 1994 and at monthly
         intervals thereafter.

5.       Purchase Option

         "Lessee may purchase all, but not less than all of the Equipment on
         the last day of the Term (the "Option Date"), for cash, at the
         Equipment's then Fair Market Value or Ten percent (10%) of the
         original Equipment Cost, whichever is greater, provided Lessee is not
         then in breach or default and the Lessee gives Lessor written notice
         of election to purchase at least sixty (60) days prior to the Option
         Date. Upon payment of the purchase price and all rentals and other
         services owing or to become owing to and including the Option Date,
         Lessor shall transfer to Lessee all of Lessor's rights, title and
         interest in the Equipment, in its then condition, without any
         representation or warranty other than the warranty that the Equipment
         is not subject to any liens resulting from acts of Lessor. For
         purposes of this Lease, the term "Fair Market Value" shall be an
         amount agreed upon by Lessor and Lessee or if such parties are unable
         to agree prior to the Option Date, such value shall be determined by
         an appraiser chosen by mutual agreement. Lessee shall pay the fees and
         expenses of the appraiser. If Lessee elects not to purchase the
         Equipment on the last day of the Term then lessee shall exercise the
         renewal option as stated in paragraph 16(b). At the end of the initial
         renewal period stated in paragraph 16(b) or any subsequent renewal
         period Lessee may purchase all but not less than all of the Equipment
         for cash at the Equipment's then Fair Market Value provided Lessee is
         not then in breach or default and gives Lessor at least sixty (60)
         days prior written notice.

6.       Renewal Option

         At the end of the Term, provided there shall be no breach or default
         by Lessee or event which with the giving of notice or passage of time,
         or both, might mature into event of default and provided Lessee has
         not exercised the purchase option as stated above in paragraph 16(a),
         then Lessee shall exercise a renewal





                                       1
<PAGE>   37
         option with respect to all but not less than all the Equipment for a
         period of eight (8) months beginning with the expiration of the Term
         at a Periodic Rental Rate of 1.45085% per month. At the expiration of
         this initial eight (8) month renewal period, and provided there shall
         be no breach or default by Lessee or event which with the giving of
         notice or passage of time, or both, might mature into an event of
         default, and provided Lessee notifies Lessor of its election to renew,
         in writing at least sixty (60) days prior to the expiration of the
         initial eight (8) month period, Lessee shall have the right to renew
         the Lease with respect to all but not less than all of the Equipment
         on an annual basis for its then Fair Market Rental Value as determined
         below. If the parties shall not have agreed upon the rental for the
         renewal period prior to the commencement thereof, then the fair market
         value shall be determined by an independent appraiser selected by
         mutual agreement; Lessee shall pay rental installments based on
         Lessor's estimate of fair market rental value until the rental is
         determined by appraisal or otherwise, at which time appropriate
         additional payment or credits shall be made or given.  Lessee shall
         pay the fees and expenses of the appraiser.  All provisions of the
         Lease shall continue in full force and effect during the initial eight
         (8) month renewal period and any subsequent renewal term except for
         the amount of the rental during any subsequent renewal term.

7.       Insurance Required (All policies to require at lease 10 days' notice
         of cancellation to Lessor):

         a.      Combined Single Limit Liability, including bodily injury and
                 property damage, of not less than $1,000,000.00 naming Lessor
                 as additional insured.

         b.      All risk physical damage, including burglary and theft, for
                 the full replacement value of the equipment, based on the
                 original equipment cost of $62,684.14 and Loss Payable
                 Endorsement naming Lessor as loss payee.

         c.      Other: 

8.       Stipulated Loss Values:

                 First Year:      103.3568%
                 Second Year:      76.1471%
                 Third Year:       46.3144%

Accepted and agreed this 25th day of July, 1994 as Schedule No. One to that
certain Master Equipment Lease Agreement dated May 20, 1994 by and between the
parties hereto.
                                           
LESSOR:                                   LESSEE:
                                          SEITEL GEOPHYSICAL, INC. DBA EAGLE
METLIFE CAPITAL, LIMITED PARTNERSHIP      GEOPHYSICAL


By:  MetLife Capital Corporation          By:  /s/ [illegible signature]
Its: General Partner                      Its: President


By:  /s/ [illegible signature]
Its: Vice President





                                       2
<PAGE>   38


                             LEASE CLOSING SCHEDULE

Lessee Name:              Seitel Geophysical, Inc. dba Eagle Geophysical
Equipment Lease No.:      1004194
Dated:                    May 20, 1994
Schedule No.:             005
Closing Date:             July 25, 1994

1.       Description of Equipment:
         (750) Cable strings, MIMIC 20DX 10-395 Land 70%            $229,500.00
         (750) Cable strings, MJC 20DX 10-395 1K Marsh               358,500.00
         (750) Geophone Connector Assembly                            28,585.00
         One (1) MGA with hardware, Geophone Analyzer Test Equip.     11,366.25
                                  Total                             $627,951.25

2.       Location of Equipment: (Lessee agrees that the Equipment will at all
         times remain in the possession and control of Lessee at the
         location(s) specified below, and will not be removed without Lessor's
         prior written consent.)

         Hwy 59 South
         Rosenberg, TX 77471

3.       Total Equipment Cost:    $627,951.25

4.       Periodic Rent:
         The total sum of $655,965.36
         Dollars in thirty six (36) installments of $18,221.26 plus applicable
         sales taxes
         Dollars each, payable commencing on July 25, 1994 and at monthly
         intervals thereafter.

5.       Purchase Option

         "Lessee may purchase all, but not less than all of the Equipment on
         the last day of the Term (the "Option Date"), for cash, at the
         Equipment's then Fair Market Value or Ten percent (10%) of the
         original Equipment Cost, whichever is greater, provided Lessee is not
         then in breach or default and the Lessee gives Lessor written notice
         of election to purchase at least sixty (60) days prior to the Option
         Date. Upon payment of the purchase price and all rentals and other
         services owing or to become&.`owing to and including the Option Date,
         Lessor shall transfer to Lessee all of Lessor's rights, title and
         interest in the Equipment, in its then condition, without any
         representation or warranty other than the warranty that the Equipment
         is not subject to any liens resulting from acts of Lessor. For
         purposes of this Lease, the term "Fair Market Value" shall be an
         amount agreed upon by Lessor and Lessee or if such parties are unable
         to agree prior to the Option Date, such value shall be determined by
         an appraiser chosen by mutual agreement. Lessee shall pay the fees and
         expenses of the appraiser. If Lessee elects not to purchase the
         Equipment on the last day of the Term then lessee shall exercise the
         renewal option as stated in paragraph 16(b). At the end of the initial
         renewal period stated in paragraph 16(b) or any subsequent renewal
         period Lessee may purchase all but not less than all of the Equipment
         for cash at the Equipment's then Fair Market Value provided Lessee is
         not then in breach or default and gives Lessor at least sixty (60)
         days prior written notice.

6.       Renewal Option

         At the end of the Term, provided there shall be no breach or default
         by Lessee or event which with the giving of notice or passage of time,
         or both, might mature into event of default and provided Lessee has
         not exercised the purchase option as stated above in paragraph 16(a),
         then Lessee shall exercise a renewal





                                       1
<PAGE>   39
         option with respect to all but not less than all the Equipment for a
         period of eight (8)months beginning with the expiration of the Term at
         a Periodic Rental Rate of 1.45085% per month. At the expiration of
         this initial eight (8) month renewal period, and provided there shall
         be no breach or default by Lessee or event which with the giving of
         notice or passage of time, or both, might mature into an event of
         default, and provided Lessee notifies Lessor of its election to renew,
         in writing at least sixty (60) days prior to the expiration of the
         initial eight (8) month period, Lessee shall have the right to renew
         the Lease with respect to all but not less than all of the Equipment
         on an annual basis for its then Fair Market Rental Value as determined
         below. If the parties shall not have agreed upon the rental for the
         renewal period prior to the commencement thereof, then the fair market
         value shall be determined by an independent appraiser selected by
         mutual agreement; Lessee shall pay rental installments based on
         Lessor's estimate of fair market rental value until the rental is
         determined by appraisal or otherwise, at which time appropriate
         additional payment or credits shall be made or given. Lessee shall pay
         the fees and expenses of the appraiser. All provisions of the Lease
         shall continue in full force and effect during the initial eight (8)
         month renewal period and any subsequent renewal term except for the
         amount of the rental during any subsequent renewal term.

7.       Insurance Required (All policies to require at lease 10 days' notice
         of cancellation to Lessor):

         a.      Combined Single Limit Liability, including bodily injury and
                 property damage, of not less than $1,000,000.00 naming Lessor
                 as additional insured.

         b.      All risk physical damage, including burglary and theft, for
                 the full replacement value of the equipment, based on the
                 original equipment cost of $627,951.25 and Loss Payable
                 Endorsement naming Lessor as loss payee.

         c.      Other:

8.       Stipulated Loss Values:

                 First Year:  103.356868%
                 Second Year:    76.1471%
                 Third Year:     46.3144%

Accepted and agreed this 25th day of July, 1994 as Schedule No. Five to that
certain Master Equipment Lease Agreement dated May 20, 1994 by and between the
parties hereto.
                                          
LESSOR:                                   LESSEE:
                                          SEITEL GEOPHYSICAL, INC. DBA EAGLE
METLIFE CAPITAL, LIMITED PARTNERSHIP      GEOPHYSICAL


By:  MetLife Capital Corporation          By:  /s/ [illegible signature]
Its: General Partner                      Its: President


By:  /s/ [illegible signature]
Its: Vice President





                                       2
<PAGE>   40

                             LEASE CLOSING SCHEDULE



Lessee Name:              Seitel Geophysical, Inc. dba Eagle Geophysical
Equipment Lease No.:      1004194
Dated:                    May 20, 1994
Schedule No.:             006
Closing Date:             July 29, 1994

1.       Description of Equipment:

         Multiple cables more fully described on the attached Exhibit "A"
         herein incorporated by this reference.

2.       Location of Equipment: (Lessee agrees that the Equipment will at all
         times remain in the possession and control of Lessee at the
         location(s) specified below, and will not be removed without Lessor's
         prior written consent.)

         Hwy 59 South
         Rosenberg, TX 77471

3.       Total Equipment Cost:    $182,213.43

4.       Periodic Rent:
         The total sum of $189,961.20
         Dollars in thirty six (36) installments of $5,276.70 plus applicable
         sales taxes
         Dollars each, payable commencing on July 29, 1994 and at monthly
         intervals thereafter.

5.       Purchase Option

         "Lessee may purchase all, but not less than all of the Equipment on
         the last day of the Term (the "Option Date"), for cash, at the
         Equipment's then Fair Market Value or Ten percent (10%) of the
         original Equipment Cost, whichever is greater, provided Lessee is not
         then in breach or default and the Lessee gives Lessor written notice
         of election to purchase at least sixty (60) days prior to the Option
         Date. Upon payment of the purchase price and all rentals and other
         services owing or to become owing to and including the Option Date,
         Lessor shall transfer to Lessee all of Lessor's rights, title and
         interest in the Equipment, in its then condition, without any
         representation or warranty other than the warranty that the Equipment
         is not subject to any liens resulting from acts of Lessor. For
         purposes of this Lease, the term "Fair Market Value" shall be an
         amount agreed upon by Lessor and Lessee or if such parties are unable
         to agree prior to the Option Date, such value shall be determined by
         an appraiser chosen by mutual agreement. Lessee shall pay the fees and
         expenses of the appraiser. If Lessee elects not to purchase the
         Equipment on the last day of the Term then lessee shall exercise the
         renewal option as stated in paragraph 16(b). At the end of the initial
         renewal period stated in paragraph 16(b) or any subsequent renewal
         period Lessee may purchase all but not less than all of the Equipment
         for cash at the Equipment's then Fair Market Value provided Lessee is
         not then in breach or default and gives Lessor at least sixty (60)
         days prior written notice.

6.       Renewal Option

         At the end of the Term, provided there shall be no breach or default
         by Lessee or event which with the giving of notice or passage of time,
         or both, might mature into event of default and provided Lessee has
         not exercised the purchase option as stated above in paragraph 16(a),
         then Lessee shall exercise a renewal option with respect to all but
         not less than all the Equipment for a period of eight (8) months
         beginning with the expiration of the Term at a Periodic Rental Rate of
         1.44794% per month. At the expiration of this





                                       1
<PAGE>   41
         initial eight (8) month renewal period, and provided there shall be no
         breach or default by Lessee or event which with the giving of notice
         or passage of time, or both, might mature into an event of default,
         and provided Lessee notifies Lessor of its election to renew, in
         writing at least sixty (60) days prior to the expiration of the
         initial eight (8) month period, Lessee shall have the right to renew
         the Lease with respect to all but not less than all of the Equipment
         on an annual basis for its then Fair Market Rental Value as determined
         below. If the parties shall not have agreed upon the rental for the
         renewal period prior to the commencement thereof, then the fair market
         value shall be determined by an independent appraiser selected by
         mutual agreement; Lessee shall pay rental installments based on
         Lessor's estimate of fair market rental value until the rental is
         determined by appraisal or otherwise, at which time appropriate
         additional payment or credits shall be made or given. Lessee shall pay
         the fees and expenses of the appraiser. All provisions of the Lease
         shall continue in full force and effect during the initial eight (8)
         month renewal period and any subsequent renewal term except for the
         amount of the rental during any subsequent renewal term.

7. Insurance Required (All policies to require at lease 10 days' notice of
   cancellation to Lessor):

         a.      Combined Single Limit Liability, including bodily injury and
                 property damage, of not less than $1,000,000.00 naming Lessor
                 as additional insured.

         b.      All risk physical damage, including burglary and theft, for
                 the full replacement value of the equipment, based on the
                 original equipment cost of $182,213.43 and Loss Payable
                 Endorsement naming Lessor as loss payee.

         c.      Other:

8.       Stipulated Loss Values:

                 First Year:      103.3465%
                 Second Year:      76.1044%
                 Third Year:       46.2758%

Accepted and agreed this 28th day of July, 1994 as Schedule No. Three to that
certain Master Equipment Lease Agreement dated May 20, 1994 by and between the
parties hereto.
                                          
LESSOR:                                   LESSEE:
                                          SEITEL GEOPHYSICAL, INC. DBA EAGLE
METLIFE CAPITAL, LIMITED PARTNERSHIP      GEOPHYSICAL


By:  MetLife Capital Corporation          By:  /s/ [illegible signature]
Its: General Partner                      Its: President


By:  /s/ [illegible signature]
Its: Vice President





                                       2
<PAGE>   42
1004194-006                                                          Page 1 of 1

                This Exhibit "A" is attached to and made a part
       of that Lease Closing Schedule for the transaction by and between
               MetLife Capital, Limited Partnership as Lessor and
            Seitel Geophysical, Inc. dba Eagle Geophysical as Lessee

<TABLE>
<CAPTION>
Vendor/Invoice            Equipment Description                                      Equipment Cost
- --------------            ---------------------                                      --------------
<S>                       <C>                                                          <C>
Geospace Corporation      (1500) Cable, SNGL 20DX 10-395 1 K 901 Single                48,009 .60
110938                    Marsh Drop with geophones

Steward Cable Repair      (141,486) SVL 2-225CB-310/F Gel Cable                        134,203.83
5103, 5129, 5147, 5193,   (100) 610' Single Drop Cables
5199, 5205, 5220, 5221,   (150) Cables SCL 4-50-250-F 610'w/molded pigtail
5225, 5226, 5204, 5247,   at 210'
5246, 5245                (100) 610' cables SCL 4-50-250/F Gel Wire
                          w/molded pigtail at 210'~A" end
                          (100) cables SCL-4-50-250-F Gelled Wire 610'
                          w/molded pigtails
                          (150) cables SCL 4-50-250-F Gelled Wire 610'
                          w/drop pigtail at 210'
                          (150) cables SCL 4-50-250 Gelled Wire 610'
                          w/pigtail drops at 210'

                                           TOTAL 1004194-006                           182,213.43
</TABLE>





                                       3
<PAGE>   43


                             LEASE CLOSING SCHEDULE

Lessee Name:              Seitel Geophysical, Inc. dba Eagle Geophysical
Equipment Lease No.:      1004194
Dated:                    May 20, 1994
Schedule No.:             007
Closing Date:             July 29, 1994

1.       Description of Equipment:

         Multiple cables more fully described on the attached Exhibit "A"
         herein incorporated by this reference.

2.       Location of Equipment: (Lessee agrees that the Equipment will at all
         times remain in the possession and control of Lessee at the
         location(s) specified below, and will not be removed without Lessor's
         prior written consent.)

         107 Corne Road
         Broussard, LA

3.       Total Equipment Cost:    $175,531.52

4.       Periodic Rent:
         The total sum of $182,995.20
         Dollars in thirty six (36) installments of $5,083.20 plus applicable
         sales taxes
         Dollars each, payable commencing on July 29, 1994 and at monthly
         intervals thereafter.

5.       Purchase Option

         "Lessee may purchase all, but not less than all of the Equipment on
         the last day of the Term (the "Option Date"), for cash, at the
         Equipment's then Fair Market Value or Ten percent (10%) of the
         original Equipment Cost, whichever is greater, provided Lessee is not
         then in breach or default and the Lessee gives Lessor written notice
         of election to purchase at least sixty (60) days prior to the Option
         Date. Upon payment of the purchase price and all rentals and other
         services owing or to become owing to and including the Option Date,
         Lessor shall transfer to Lessee all of Lessor's rights, title and
         interest in the Equipment, in its then condition, without any
         representation or warranty other than the warranty that the Equipment
         is not subject to any liens resulting from acts of Lessor. For
         purposes of this Lease, the term "Fair Market Value" shall be an
         amount agreed upon by Lessor and Lessee or if such parties are unable
         to agree prior to the Option Date, such value shall be determined by
         an appraiser chosen by mutual agreement. Lessee shall pay the fees and
         expenses of the appraiser. If Lessee elects not to purchase the
         Equipment on the last day of the Term then lessee shall exercise the
         renewal option as stated in paragraph 16(b). At the end of the initial
         renewal period stated in paragraph 16(b) or any subsequent renewal
         period Lessee may purchase all but not less than all of the Equipment
         for cash at the Equipment's then Fair Market Value provided Lessee is
         not then in breach or default and gives Lessor at least sixty (60)
         days prior written notice.

6.       Renewal Option

         At the end of the Term, provided there shall be no breach or default
         by Lessee or event which with the giving of notice or passage of time,
         or both, might mature into event of default and provided Lessee has
         not exercised the purchase option as stated above in paragraph 16(a),
         then Lessee shall exercise a renewal option with respect to all but
         not less than all the Equipment for a period of eight (8) months
         beginning with the expiration of the Term at a Periodic Rental Rate of
         1.44794% per month. At the expiration of this





                                       1
<PAGE>   44
         initial eight (8) month renewal period, and provided there shall be no
         breach or default by Lessee or event which with the giving of notice
         or passage of time, or both, might mature into an event of default,
         and provided Lessee notifies Lessor of its election to renew, in
         writing at least sixty (60) days prior to the expiration of the
         initial eight (8) month period, Lessee shall have the right to renew
         the Lease with respect to all but not less than all of the Equipment
         on an annual basis for its then Fair Market Rental Value as determined
         below. If the parties shall not have agreed upon the rental for the
         renewal period prior to the commencement thereof, then the fair market
         value shall be determined by an independent appraiser selected by
         mutual agreement; Lessee shall pay rental installments based on
         Lessor's estimate of fair market rental value until the rental is
         determined by appraisal or otherwise, at which time appropriate
         additional payment or credits shall be made or given. Lessee shall pay
         the fees and expenses of the appraiser. All provisions of the Lease
         shall continue in full force and effect during the initial eight (8)
         month renewal period and any subsequent renewal term except for the
         amount of the rental during any subsequent renewal term.

7. Insurance Required (All policies to require at lease 10 days' notice of
   cancellation to Lessor):

         a.      Combined Single Limit Liability, including bodily injury and
                 property damage, of not less than $1,000,000.00 naming Lessor
                 as additional insured.

         b.      All risk physical damage, including burglary and theft, for
                 the full replacement value of the equipment, based on the
                 original equipment cost of $175,531.52 and Loss Payable
                 Endorsement naming Lessor as loss payee.

         c.      Other:

8.       Stipulated Loss Values:

                 First Year:      103.3465%
                 Second Year:      76.1044%
                 Third Year:       46.2758%

Accepted and agreed this 28th day of July, 1994 as Schedule No. Three to that
certain Master Equipment Lease Agreement dated May 20, 1994 by and between the
parties hereto.
                                          
LESSOR:                                   LESSEE:
                                          SEITEL GEOPHYSICAL, INC. DBA EAGLE
METLIFE CAPITAL, LIMITED PARTNERSHIP      GEOPHYSICAL


By:  MetLife Capital Corporation          By:  /s/ [illegible signature]
Its: General Partner                      Its: President


By:  /s/ [illegible signature]
Its: Vice President





                                       2
<PAGE>   45
1004194-007                                                          Page 1 of 1

                This Exhibit "A" is attached to and made a part
       of that Lease Closing Schedule for the transaction by and between
               MetLife Capital, Limited Partnership as Lessor and
            Seitel Geophysical, Inc. dba Eagle Geophysical as Lessee

<TABLE>
<CAPTION>
Vendor/Invoice                    Equipment Description                              Equipment Cost
- --------------                    ---------------------                              --------------
<S>                               <C>                                                  <C>
Tescorp Seimic Products           (741) CA-2001 Interconnect CBL, 610' BC-1009,        156,041.58
21113, 21063, 21077,              w/RM2M/PCR, CFM Eagle Conn.
21084, 21088, 21101

Steward Cable Repair
5051                              (40) Wireline Opseis Cable Gel Filled at 1000'       17,752 .00
                                  w/LTI Connectors
                                  (40) Terminators Cables Gel-Filled at 9"
                                  w/LTI Connectors
                                  (80) B1167 LTI Female Connectors
                                  (80) B1143 LTI Male Connectors

Louisiana Dept of Revenue         Sales Tax upfront of 1 %                              1,737 .94

                                                            TOTAL 1004194007           175,531.52
</TABLE>





                                       3
<PAGE>   46


                             LEASE CLOSING SCHEDULE

Lessee Name:              Seitel Geophysical, Inc. dba Eagle Geophysical
Equipment Lease No.:      1004194
Dated:                    May 20, 1994
Schedule No.:             008
Closing Date:             September 19, 1994

1.       Description of Equipment:

         Two Hundred fifty (250) Cable, SNGL MP24L3 1.82K 1 MTR

2.       Location of Equipment: (Lessee agrees that the Equipment will at all
         times remain in the possession and control of Lessee at the
         location(s) specified below, and will not be removed without Lessor's
         prior written consent.)

         Hwy. 59 South
         Rosenberg, TX 77471

3.       Total Equipment Cost:    $73,908.05

4.       Periodic Rent:
         The total sum of $77,227.20
         Dollars in thirty six (36) installments of $2,145.20 plus applicable
         sales taxes
         Dollars each, payable commencing on September 19, 1994 and at monthly
         intervals thereafter.

5.       Purchase Option

         "Lessee may purchase all, but not less than all of the Equipment on
         the last day of the Term (the "Option Date"), for cash, at the
         Equipment's then Fair Market Value or Ten percent (10%) of the
         original Equipment Cost, whichever is greater, provided Lessee is not
         then in breach or default and the Lessee gives Lessor written notice
         of election to purchase at least sixty (60) days prior to the Option
         Date. Upon payment of the purchase price and all rentals and other
         services owing or to become owing to and including the Option Date,
         Lessor shall transfer to Lessee all of Lessor's rights, title and
         interest in the Equipment, in its then condition, without any
         representation or warranty other than the warranty that the Equipment
         is not subject to any liens resulting from acts of Lessor. For
         purposes of this Lease, the term "Fair Market Value" shall be an
         amount agreed upon by Lessor and Lessee or if such parties are unable
         to agree prior to the Option Date, such value shall be determined by
         an appraiser chosen by mutual agreement. Lessee shall pay the fees and
         expenses of the appraiser. If Lessee elects not to purchase the
         Equipment on the last day of the Term then lessee shall exercise the
         renewal option as stated in paragraph 16(b). At the end of the initial
         renewal period stated in paragraph 16(b) or any subsequent renewal
         period Lessee may purchase all but not less than all of the Equipment
         for cash at the Equipment's then Fair Market Value provided Lessee is
         not then in breach or default and gives Lessor at least sixty (60)
         days prior written notice.

6.       Renewal Option

         At the end of the Term, provided there shall be no breach or default
         by Lessee or event which with the giving of notice or passage of time,
         or both, might mature into event of default and provided Lessee has
         not exercised the purchase option as stated above in paragraph 16(a),
         then Lessee shall exercise a renewal option with respect to all but
         not less than all the Equipment for a period of eight (8) months
         beginning with the expiration of the Term at a Periodic Rental Rate of
         1.4494% per month. At the expiration of this





                                       1
<PAGE>   47
         initial eight (8) month renewal period, and provided there shall be no
         breach or default by Lessee or event which with the giving of notice
         or passage of time, or both, might mature into an event of default,
         and provided Lessee notifies Lessor of its election to renew, in
         writing at least sixty (60) days prior to the expiration of the
         initial eight (8) month period, Lessee shall have the right to renew
         the Lease with respect to all but not less than all of the Equipment
         on an annual basis for its then Fair Market Rental Value as determined
         below. If the parties shall not have agreed upon the rental for the
         renewal period prior to the commencement thereof, then the fair market
         value shall be determined by an independent appraiser selected by
         mutual agreement; Lessee shall pay rental installments based on
         Lessor's estimate of fair market rental value until the rental is
         determined by appraisal or otherwise, at which time appropriate
         additional payment or credits shall be made or given. Lessee shall pay
         the fees and expenses of the appraiser. All provisions of the Lease
         shall continue in full force and effect during the initial eight (8)
         month renewal period and any subsequent renewal term except for the
         amount of the rental during any subsequent renewal term.

7. Insurance Required (All policies to require at lease 10 days' notice of
   cancellation to Lessor):

         a.      Combined Single Limit Liability, including bodily injury and
                 property damage, of not less than $1,000,000.00 naming Lessor
                 as additional insured.

         b.      All risk physical damage, including burglary and theft, for
                 the full replacement value of the equipment, based on the
                 original equipment cost of $73,908.05 and Loss Payable
                 Endorsement naming Lessor as loss payee.

         c.      Other:

8.       Stipulated Loss Values:

                 First Year:      103.3690%
                 Second Year:      76.2104%
                 Third Year:       46.3894%

Accepted and agreed this 16th day of September, 1994 as Schedule No. Three to
that certain Master Equipment Lease Agreement dated May 20, 1994 by and between
the parties hereto.
                                          
LESSOR:                                   LESSEE:
                                          SEITEL GEOPHYSICAL, INC. DBA EAGLE
METLIFE CAPITAL, LIMITED PARTNERSHIP      GEOPHYSICAL


By:  MetLife Capital Corporation          By:  /s/ [illegible signature]
Its: General Partner                      Its: President


By:  /s/ [illegible signature]
Its: Vice President





                                       2
<PAGE>   48
                     CORRECTION TO LEASE CLOSING SCHEDULES

                                  1004194-001
                                  1004194-002
                                  1004194-003
                                  1004194-004
                                  1004194-005
                                  1004194-006
                                  1004194-007
                                  1004194-008

September 16, 1994

Mr. Horace A. Calvert
SEITEL GEOPHYSICAL, INC. dba EAGLE GEOPHYSICAL
50 Briar Hollow Lane West, 7th Floor
Houston, TX 77027

Dear Mr. Calvert:

During a recent review of our documentation on transactions 1004194-001 through
1004194-008 for equipment being leased to you we found a discrepancy in the
information presently in our files.

As a result, we are making the following corrections to the Lease Closing
Schedules:

5. Purchase Option.        The words "paragraph 16(b)" are replaced with the 
                           words "6. Renewal Option".

Section 6. Renewal Option. The words "paragraph 16(a)" are replaced with the 
                           words "5. Purchase Option".

Accepted and agreed this 16th day of September, 1994.
                                          
LESSOR:                                   LESSEE:

METLIFE CAPITAL, LIMITED PARTNERSHIP      SEITEL GEOPHYSICAL, INC.
                                          DBA EAGLE GEOPHYSICAL
By: MetLife Capital Corporation, 
    General Partner

By:                                       By:
Its: Senior Vice President                Its: President





                                       3

<PAGE>   1

                                                                  EXHIBIT 10.6.2
                      ASSIGNMENT AND ASSUMPTION AGREEMENT

         This Assignment and Assumption Agreement (the "Agreement") is entered
into as of the 31st day of December, 1996, between SEITEL GEOPHYSICAL. INC.,
dba, Eagle Geophysical ("Assignor") a Delaware corporation, with its principal
place of business at 50 Briar Hollow Lane West, 7th Floor, Houston, Texas 77027
and EAGLE GEOPHYSICAL. INC.  ("Assignee"), a Delaware corporation, with its
principal place of business at 50 Briar Hollow Lane West, 7th Floor, Houston,
Texas 77027.

                                    RECITALS

A.       Assignor, as Lessee, has entered into a Master Equipment Lease
         Agreement, dated May 20, 1994, and the respective schedules,
         amendments, and addendums thereto, (collectively referred to herein as
         the "Lease") with MetLife Capital, Limited Partnership, a Delaware
         limited partnership ("MetLife"), as Lessor, whereby Assignor has
         leased from MetLife: Opseis Eagle Recording System and Ancillary
         Equipment; Opseis Eagle Telemetry Seismic Data Acquisition System;
         ATV's, Engine and Generator, Three 1994 Circle M Utility Trailers; One
         Spectrum Analyzer with Cables; Cable Strings Land/Marsh; MGA with
         hardware, Geophone Analyzer Test Equipment; Multiple Cables, all more
         fully described in the attached copies of the Lease documents herein
         as Exhibit "A" (the "Equipment"). Terms used in the agreement are,
         unless defined herein, used as defined in the Lease.

B.       Lease documents attached as Exhibit "A". herein incorporated by this
         reference, are as follows: Master Equipment Lease Agreement dated
         5/20/94; Addendum No. One dated 5/20/94; Amendment No. One dated
         5/20/94; Amendment No. Two dated 9/16/94; Request to Purchase Addendum
         No. One dated 5/20/94 as amended by Amendment No.  One dated 5/20/94
         and Amendment No. Two dated 9/16/94; Request to Purchase Addendum No.
         Two dated 5/20/94 as amended by Amendment No. One dated 5/20/94 and
         Amendment No. Two dated 9/16194; Lease Closing Schedules 001, 002,
         003, 004, 005, 006, 007, and 008 dated 7129194, 717194, 717194,
         7125194, 7125194, 7129194, 7129194, and 9/19/94, consecutively; and
         the 9/16/94 Letter of Correction (collectively referred to herein as
         "the Lease").

C.       The Assignor wishes to assign to the Assignee, and the Assignee wishes
         to accept an assignment from the Assignor, of the Assignor's right,
         title and interest in and to the Lease.

D.       Pursuant to the terms of the Lease, MetLife's consent to the
         assignment of Assignor's interest in the Lease is required. One of the
         conditions to MetLife's willingness to give that consent is that the
         parties enter into the covenants and make the representations and
         warranties set forth in this Agreement.

NOW, THEREFORE, The parties agree as follows:

1.       Assignment and Assumption.

         Assignor hereby sells, assigns, transfers and sets over unto Assignee
         and unto Assignee's successors and assigns, all right, title, and
         interest of Assignor under, in and to the Lease. The Assignee hereby
         assumes, and covenants with Assignor and MetLife to perform fully, all
         the duties of the Assignor under the Lease. It is expressly understood
         and agreed that Assignee assumes all such obligations notwithstanding
         the fact that some of such obligations may have accrued prior to the
         date hereof.

2.       Representations and Warranties of Assignee and Assignor.

         Assignee and Assignor represent and warrant individually and
         respectively as applicable, to MetLife as follows:

         a.      The Assignee is a corporation duly organized and validly
                 existing in good standing under the laws of the State of
                 Delaware and has the power and authority to enter into and
                 perform its obligations under this Agreement. The execution,
                 delivery and performance of this Agreement has been duly





                                       1
<PAGE>   2
                 authorized by all necessary action on the part of the Assignee
                 and the Assignor, does not require any stockholder approval, or
                 approval or consent of any general or limited partner, trustee
                 or holders of any indebtedness or obligations of the Assignee
                 or Assignor except such as have been duly obtained and does not
                 and will not contravene any law, judgment, governmental rule,
                 regulation or order applicable to or binding on the Assignee or
                 Assignor or any of their subsidiaries or the certificates of
                 incorporation or bylaws of the Assignee or Assignor or any of
                 their subsidiaries or contravene the provisions of, or
                 constitute a default under, or result in the creation of any
                 lien (other than as permitted under the Lease) upon the
                 property of the Assignee or Assignor under any indenture,
                 mortgage, chattel mortgage, deed of trust, conditional sales
                 contract, bank loan or agreement or instrument, or other
                 contract or agreement to which the Assignee or Assignor or any
                 of their subsidiaries are a party or by which they or any of
                 their subsidiaries may be bound or affected;
        
         b.      This agreement constitutes the legal, valid and binding
                 obligation of the Assignee and Assignor enforceable against
                 said pa ties in accordance with its terms;

         c.      Except for the filings and recordings consummated at the time
                 of execution of the Lease and except for the filing and
                 recording of this Agreement, no further action, including any
                 filing or recording of any document, is necessary or advisable
                 in order to establish and protect MetLife's title to and
                 interest in the Equipment as against the Assignee, the
                 Assignor, and any third parties in any applicable
                 jurisdictions in the United States.

3.       Assignor's Continuing Obligation and Guaranty.

         Assignor covenants with MetLife that notwithstanding its assignment of
         the Lease to the Assignee, Assignor will duly and punctually perform
         and observe each and every obligation, covenant, representation,
         warranty and agreement to be performed and observed by the Lessee
         under the provisions of the Lease, notwithstanding the fact that
         Assignee is similarly obligated by the terms of this Agreement to
         perform or observe those obligations, covenants, representations or
         warranties of Lessee arising pursuant to the terms of the Lease;
         provided, however, that Assignor shall have no obligation hereunder to
         make any payment to MetLife required by any Lease provision to the
         extent that Assignee has satisfied the obligations of the Lessee
         arising pursuant to such Lease provision. Except as expressly set
         forth in the preceding sentence, Assignor is not released in any
         respect from its obligations to MetLife arising under the Lease or
         related documents. The Assignor hereby acknowledges and consents that
         MetLife may agree with the Assignee to extend the time for making
         payments for any or all of the amounts due or to become due under the
         Lease and documents executed in conjunction therewith or that the
         Lease and documents in conjunction therewith may be changed in any
         manner at the option of said Assignee and without Assignor's consent
         and that Assignor's obligation to perform in accordance with this
         Paragraph 3 shall extend to such agreements as changed in the same
         manner as if such changes had been part of the agreements as
         originally executed and delivered.

         The Assignor hereby absolutely and unconditionally guarantees to
         MetLife the full and timely performance by the Assignee of all
         obligations whatsoever which the Assignee has incurred or is under or
         which the Assignee may at any time incur or be under to MetLife
         pursuant to or in connection with any of the transactions contemplated
         by the Lease and this Agreement; including but not limited to all
         obligations of the Assignee for the payment of money whether by reason
         of covenant, indemnity, breach of warranty or otherwise. MetLife shall
         not be bound to exhaust their recourse nor to take any other action
         against the Assignee or other parties or on any collateral they may
         hold before being entitled to payment by the Assignor of all amounts
         hereby guaranteed. The Assignor specifically agrees that it shall not
         be necessary or required in order to enforce the obligations of the
         Assignor hereunder that there be, and specifically waives: notice of
         performance or nonperformance of the Lease; demand of payment from the
         Assignee; presentment for payment upon Assignee or the making of any
         protest; notice of the amount of guaranteed obligations outstanding at
         any time; notice of nonpayment or failure to perform on the part of
         the Assignee;





                                       2
<PAGE>   3
         and any other circumstances which might otherwise constitute a legal
         or equitable defense or discharge of a Guarantor.

4.       Financial Data. During the term of this Agreement, Assignee will
         furnish to MetLife and will cause any guarantor of Assignees
         obligations to furnish to MetLife on request (i) annual balance sheet
         and profit and loss statements prepared in accordance with generally
         accepted accounting principles and practices consistently applied and,
         if MetLife so requires, accompanied by the annual audit report of an
         independent certified public accountant reasonably acceptable to
         MetLife, and (ii) all other financial information and reports that
         MetLife may from time to time reasonably request, including, if
         MetLife so requires, income tax returns of Assignee and any guarantor
         of Assignee's obligations hereunder.

         Assignee shall, from time to time, furnish all such information as
         MetLife may reasonably request concerning Assignee and its affairs and
         shall execute and deliver such documents and perform all such other
         acts that MetLife may reasonably request in order to carry out any
         transactions contemplated by this Agreement.

5.       Miscellaneous.

         This Agreement may not be amended without the express written consent
         of MetLife. This Agreement supersedes all prior agreements between the
         parties relating to the assignment from Assignor to Assignee of the
         Assignor's interest in the Lease or the Equipment.

6.       Counterparts.

         This Agreement may be signed in any number of counterparts required
         for the convenience of the parties, all of which when taken together
         shall form one and the same Agreement.

IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the
day and year first above written.

                                        

                                ASSIGNOR:

                                SEITEL GEOPHYSICAL, INC., dba EAGLE GEOPHYSICAL


                                By  /s/ Jay N. Silverman
                                Its President

                                By  /s/ Marcia H. Kindrick
                                Its Assistant Secretary

                                ASSIGNEE:

                                EAGLE GEOPHYSICAL, INC.


                                By  /s/ Jay N. Silverman
                                Its President

                                By  /s/ Marcia H. Kindrick
                                Its Assistant Secretary




                                       3
<PAGE>   4
                               CONSENT OF METLIFE

On the terms and conditions set forth above, MetLife Capital, Limited
Partnership hereby consents to the assignment by SEITEL GEOPHYSICAL, INC., dba
Eagle Geophysical of its interest under the Lease described above to EAGLE
GEOPHYSICAL, INC. dated this 30th day of December, 1996.

                                        METLIFE CAPITAL, LIMITED PARTNERSHIP

                                        By: MetLife Capital Corporation
                                        Its: General Partner


                                        By  /s/ [illegible signature]
                                        Its Vice President






                                       4
<PAGE>   5
[    ]   METROPOLITAN LIFE
                 AND AFFILIATED COMPANIES
                                                MASTER EQUIPMENT LEASE AGREEMENT
                 METLIFE CAPITAL CORPORATION

THIS AGREEMENT is entered into the 20th day of May, 1994 between METLIFE
CAPITAL, LIMITED PARTNERSHIP ("Lessor") whose address is 10900 N. E. 8th
Street, mailing address C-97550, Bellevue, Washington 98009 and Seitel
Geophysical, Inc.  d/v/a Eagle Geophysical ("Lessee") whose address is 50 Briar
Hollow Lane West, 7th Floor, Houston, Texas 77027, Lessor and Lessee from time
to time may enter into written agreements in the form of "Request to Purchase
Addenda" for the purchase by Lessor of equipment and leasing of such equipment
to Lessee.  To facilitate such transactions, Lessor and Lessee are entering
into this Master Equipment Lease Agreement (the "Master Lease"), the terms and
provisions of which shall be incorporated by reference in each such Request to
Purchase, and they MUTUALLY AGREE AS FOLLOWS:

1.       REQUEST TO PURCHASE

If Lessor agrees to acquire and lease equipment when requested by Lessee, the
parties shall sign a Request to Purchase Addendum ("Request to Purchase")
setting forth the particulars regarding the transaction, including, without
limitation, the list of items of equipment (individually, an "Item" and,
collectively, the "Equipment"), the prices of each Item (including disclosure
of all rebates, discounts and other incentives received or receivable with
respect thereto), "Related Costs," including taxes, transportation,
installation and other applicable costs, the aggregate of the foregoing ("Total
Cost"), length of the Basic Term, rental rates and other applicable provisions.
"Cost of an Item" shall mean the price of the Item plus its applicable portion
of Related Costs.  In the absence of a signed Request to Purchase, this Master
Lease shall not constitute a lease or a commitment by either party to enter
into a lease.

2.       PURCHASE; ACCEPTANCE

         (a)     REQUEST; SPECIFICATIONS.  Signing a Request to Purchase shall
constitute the request from Lessee to Lessor to purchase the Equipment, and the
Request to Purchase and this Master Lease shall constitute the lease and
agreement (the "Lease") regarding the Equipment.  Lessee will assign to Lessor
purchase orders or agreements issued or entered into by Lessee for the
Equipment, or Lessor shall issue Lessor's purchase orders to the suppliers of
the Equipment, as Lessor at the time shall deem appropriate, all in form and
substance satisfactory to Lessor.  At the time of signing the Request to
Purchase, Lessee shall furnish Lessor detailed specifications
("Specifications") for the purchase of the Items, including descriptions,
prices, delivery terms and instructions, installation provisions and all other
applicable specifications.  Lessee assumes full responsibility with respect to
the selection of Items supplied for lease and the specification thereof; the
Lessor shall have no liability or responsibility with respect thereto
regardless of whether the specifications prove inadequate for the intended
purpose or use.

         (b)     INSPECTION; ACCEPTANCE.  It is Lessee's responsibility to
receive and promptly inspect and test each Item tendered for delivery by a
supplier and the installation thereof.  Lessee shall give Lessor written notice
of acceptance of an Item as soon as it can be determined that the Item and its
installation are in compliance with Specifications.  As between Lessee and
Lessor, the giving of such written notice shall constitute Lessee's irrevocable
acceptance of the Item or Items designated in the notice, whether or not such
items or their installation or Lessor's title to the same are defective in any
respect, and notwithstanding any failure of an Item or its installation to
conform to Specifications, without prejudice however to rights which Lessor and
Lessee, or either of them, may have against any other person, whether with
respect to design, manufacture, condition or otherwise.

         (c)     PURCHASE CUT-OFF DATE.  If, by the "Purchase Cut-Off Date" set
forth in a Request to Purchase, Lessee shall not have given Lessor written
notice of acceptance of an Item, Lessor shall have no obligation to purchase
the Item or to lease it to Lessee.  In such event, Lessee shall immediately pay
all accrued interim Rental and reimburse Lessor for all sums Lessor may have
paid for or with respect to the Item and for all Lessor's costs and expenses
with respect thereto, and Lessee shall indemnify and defend Lessor against and
hold Lessor harmless from any and all cost, expense, loss, liability and damage
that Lessor may suffer or that may be asserted against Lessor by reason of
Lessor's failure or refusal to purchase such Item.  Any such item shall be
deemed to be deleted from the Request to Purchase and no longer included in the
Equipment.





                                       5
<PAGE>   6
         (d)     CONDITIONS.  Lessee shall deliver to Lessor such further
instruments, documents and certifications as Lessor reasonably may request,
including without limitation evidences of authority (e.g., corporate
certificates, corporate resolutions, partnership documents and authorizations),
evidence of insurance, purchase orders and acceptances thereof, purchase and
sale agreements and financial information, and instruments and documents to
implement, perfect or continue the perfection of Lessor's rights and remedies
as owner and Lessor of the Equipment, including Uniform Commercial Code forms.
Notwithstanding the execution, delivery or filing of any instruments or
documents, it is agreed that this transaction is a lease and is not intended as
security.  Lessee's delivery of the foregoing and of the Specifications are
conditions precedent to any obligation of Lessor to purchase or to make any
commitments to purchase or pay for the Equipment or any item.

         (e)     SUPPLEMENTAL LEASE SCHEDULE.  If at any time prior to the
Closing Date Lessee requests Lessor to add further Items to the Equipment, and
if Lessor so agrees, Lessee shall execute a Supplemental Request to Purchase in
a form supplied by Lessor, which shall become part of the Request to Purchase,
subject to all of its provisions and the provisions of this Master Lease, and
the equipment specified therein shall be Items of Equipment under the Lease.
If at any time after the Closing Date Lessee requests Lessor to add further
Items to the Equipment, and if Lessor so agrees, Lessee shall execute an
additional Request to Purchase Addendum, amending the Lease to include such
Items as part of the equipment and setting forth the particulars with respect
thereto.  The Basic Term with respect to all Equipment, including Items covered
by a Supplemental Lease Schedule, shall terminate in accordance with the
provisions of the original Request to Purchase.

         (f)     CLOSING.  Following the date ("Closing Date") which is the
earlier of (i) the date Lessee gives Lessor written notice of acceptance of the
last Item or (ii) the Purchase Cut-Off Date (or on such other day as is
mutually agreed), Lessor shall send Lessee a Closing Schedule, setting forth
any adjustments to descriptions and Costs of Items and Total Cost and
confirming the Closing Date and amount of Periodic Rental installments and
payment schedules.  Such Closing Schedule and the facts and determinations set
forth therein shall be conclusive unless, within sixty (60) days after the
Closing Schedule is sent by Lessor to Lessee, Lessee shall give Lessor written
notice specifying any claimed error therein.  Notwithstanding any such notice,
Lessee shall pay all rentals as they become due.  If Lessee establishes an
error that affects the amount of rentals, Lessor shall give Lessee a credit for
any overpayment of rentals, and Lessee promptly shall pay Lessor any
underpayments.

3.       LESSEE'S WARRANTIES

         (a)     Lessee represents and warrants to Lessor that it is a
corporation or partnership duly organized, validly existing and in good
standing under the laws of the jurisdiction of its organization and that it is
qualified to do business in every jurisdiction where the failure to qualify
would have a materially adverse effect on Lessor's rights hereunder; it has
taken all corporate or partnership action which may be required to authorize
the execution, delivery and performance of this Lease, and such execution,
delivery and performance will not conflict with or violate any provision of its
Charter or Articles or Certificate of Incorporation, By-laws or any provisions
thereof, or in the case of a partnership, its Certificate of Partnership or
Limited Partnership and its Partnership Agreement, or result in a default or
acceleration of any obligation under any agreement, order, decree or judgment
to which it is a party or by which it is bound, nor is it now in default under
any of the same; there is no litigation or proceeding pending or threatened
against it which may have a materially adverse effect on Lessee or which would
prevent or hinder the performance by it of its obligation hereunder; this lease
and the attendant documents constitute valid obligations of the Lessee, binding
and enforceable against it in accordance with their respective terms; no action
by or with any commission or administrative agency is required in connection
herewith; it has the power to own its assets and to transact business in which
it is engaged; it will give to Lessor prompt notice of any change in its name,
identity or structure.

         (b)     Lessee's written acceptance of an Item and its installation
shall constitute a REPRESENTATION AND WARRANTY BY Lessee to Lessor that: (i)
the Item is personal property in good order and condition and, unless Lessor
otherwise agrees in writing, has not been used prior to the time of such
written notice of acceptance, the Equipment does not constitute "imported
property covered by an Executive order" as defined in Section 168(g)(6) of the
Internal Revenue Code of 1986 ("Code"), and that the recovery period set forth
in the Request to Purchase is the period applicable under the Code to the
Equipment; and (ii) at all times Lessee shall keep the Equipment in Lessee's
possession at the address specified in the Request to Purchase unless Lessor
shall otherwise consent in writing.  Lessee shall not cause, suffer or permit
any Item to be attached or affixed to real property or improvements





                                       6
<PAGE>   7
thereon (collectively, "Realty") unless Lessor first shall consent thereto in
writing and Lessee shall have obtained from all persons having any interest in
the Realty written consents which approve such attachment, waive any claims to
or encumbrances upon attached Items and consent to the detachment and removal
of such Items at any time by Lessor or Lessee.  Notwithstanding attachment of
any Items to Realty, all the Equipment at all times shall be and remain
personal property.  Upon termination of Lessee's right to possession of the
Equipment, whether by expiration of the Term or otherwise, Lessee at its sole
cost and expense shall detach and remove the Equipment from the Realty and save
Lessor harmless from and indemnify and defend Lessor against any claim, demand,
loss, liability, and damage arising from such detachment, removal or both.

4.       TERM OF LEASE

The term of the Lease ("Term") shall consist of an "Interim Term" and a "Basic
Term."  The Interim Term shall begin on the date that Lessee first gives Lessor
written notice of acceptance of an Item or written approval for partial
payment, whichever is earlier, and shall continue until the time the Basic Term
begins.  The Basic Term shall begin on the Closing Date and shall continue for
the length of the Basic Term set forth in the Request to Purchase.

5.       INTERIM RENTAL

During the Interim Term, Lessee shall pay rent monthly ("Interim Rental"), on a
calendar month basis, in an amount determined by Lessor by applying the
"Interim Rental Rate" set forth in the Request to Purchase to portions of the
Total Cost then or theretofore expended by Lessor, for the number of days such
sums are outstanding during such calendar month.  The "prime rate" referred to
in this Lease shall mean the rate per annum announced by Chase Manhattan Bank,
New York City, from time to time as its prime rate, whether or not such rate is
applied by said bank to any then outstanding loans, changing with each
announced change of such prime rate.  Lessee shall pay Lessor each installment
of Interim Rental on the fifteenth day after the end of such calendar month.

6.       PERIODIC RENTAL

Lessee shall pay rent ("Periodic Rental") for the Basic Term in an amount
calculated by multiplying the Total Cost by the Periodic Rental Rate set forth
in the Request to Purchase multiplied by the number of months constituting the
length of the Basic Term.  Lessee shall pay installments of Periodic Rental to
Lessor in accordance with the payment schedule set forth in the Request to
Purchase.

7.       LATE PAYMENT

If any installment of rent or other sum owing under the Lease shall not be paid
when due and shall remain unpaid for ten (10) days, Lessee shall pay Lessor a
late charge equal to five percent (5%) of the amount delinquent, but in no
event at a rate greater than limited by any applicable law.  Such late charge
is in addition to and not in lieu of other rights and remedies Lessor may have.

8.       INSURANCE

Lessee shall procure and continuously maintain and pay for (a) all risk
physical damage insurance covering loss or damage to the Equipment for not less
than the full replacement value thereof naming Lessor as Loss Payee and (b)
bodily injury and property damage combined single limit liability insurance
naming Lessor as Additional Insured, all in such amounts and against such risks
and hazards as are set forth in the Request to Purchase, with insurance
companies and pursuant to contract or policies and with deductibles thereon
satisfactory to Lessor.  All contracts and policies shall include provisions
for the protection of Lessor notwithstanding any act or neglect of or breach or
default by Lessee, shall provide that they may not be modified, terminated or
cancelled unless Lessor is given at least ten (10) days' advance written notice
thereof, and shall provide that the coverage is "primary coverage" for the
protection of Lessee or Lessor notwithstanding any other coverage carried by
Lessee or Lessor protecting against similar risks.  Lessee shall promptly
notify any appropriate insurer and Lessor of each and every occurrence which
may become the basis of a claim or cause of action against the insureds and
provide Lessor with all data pertinent to such occurrence.  Lessee shall
furnish Lessor with certificates of such insurance or copies of policies upon
request, and shall furnish Lessor with renewal certificates not less than ten
(10) days prior to the renewal date.  Proceeds of all insurance shall be
payable first to Lessor to the extent of its liability or interest as the case
may be.





                                       7
<PAGE>   8
9.       TAXES

Lessee shall pay or reimburse Lessor for the payment of all taxes, fees,
assessments and other governmental charges of whatsoever kind or character and
by whomsoever payable on or relating to any Item of Equipment or the sale,
purchase, ownership, use, value, value added, possession, shipment,
transportation, delivery or operation thereof or the exercise of any option,
election or performance of any obligation by Lessee hereunder, which may accrue
or be levied, assessed or imposed during the Term and any Renewal Term or which
remain unpaid as of the date of surrender of such Item to Lessor, and all taxes
of any kind imposed by any federal, state, local or foreign taxing authority
against Lessor on or measured by any amount payable by Lessee hereunder,
including, without limitation, all license and registration fees and all sales,
use, value, ad valorem, personal property, excise, gross receipts, stamp or
other taxes, imposts, duties and charges together with any penalties, fines or
interest thereon, except taxes of Lessor on net income imposed by the United
States or any state.  Lessee shall reimburse Lessor for any payments made by
Lessor which are the obligation of Lessee under the Lease, but Lessee shall not
be obligated to pay any amount under this Section so long as it shall in good
faith and by appropriate proceedings contest the validity or the amount
thereof, unless such contest would adversely affect the title of Lessor to any
Item of Equipment or would subject any Item to forfeiture or sale.  Lessee
shall indemnify Lessor on an after-tax basis against any loss, claim, demand
and expense, including legal expense, resulting from such nonpayment or
contest, and further agrees to indemnify Lessor against any and all taxes,
assessments and other charges imposed upon Lessor under the laws of any
federal, state, local or foreign government or taxing authority, as a result of
any payment made by Lessee pursuant to this Section.  Whenever this lease
terminates as to any Item, Lessee will, on request, advance to Lessor the
amount estimated by Lessor to equal personal property taxes on the Item which
are not yet payable but for which Lessee will afterward become liable
hereunder;  Lessor will account to Lessee for such advances.  On request of
either Lessor or Lessee, the other will submit written evidence of all payments
required of it under this section.

10.      MAINTENANCE, ETC.

         (a)     Lessee at its expense at all times shall: (i) keep the
Equipment in good and efficient working order, condition and repair, ordinary
wear and tear excepted, and make all inspections and repairs, including
replacement of worn parts, to effect the foregoing and to comply with
requirements of laws, regulations, rules and provisions and conditions of
insurance policies; and (ii) pay all costs, expenses, fees and charges incurred
in connection with the use or operation of the Equipment and of each Item,
including but not limited to repairs, maintenance, storage and servicing.
Lessee shall not make any alterations, substitutions, improvements or additions
to the Equipment or Items, except those required in order to comply with laws,
regulations, rules and insurance policies, unless Lessor first shall have
consented thereto in writing.  Notwithstanding any consent by Lessor, Lessee
shall pay all costs and expenses of the foregoing.  All replacements, repairs,
improvements, alterations, substitutions and additions shall constitute
accessions to the Equipment and title thereto shall vest in Lessor.

         (b)     Lessor hereby transfers and assigns to Lessee, for so long
during the Term and any Renewal Term as Lessee is not in default, Lessor's
right, title and interest in, under and to any assignable factory and dealer
warranty, whether express or implied, with respect to the Equipment.  All
claims and actions upon any warranty shall be made and prosecuted by Lessee at
its sole cost and expense.  Lessor shall have no obligation to make or
prosecute any claim upon or under a warranty.  So long as Lessee shall not be
in default, Lessor shall cooperate with Lessee with respect to a claim on a
non-assignable warranty, at Lessee's expense.  Lessee shall have proceeds of a
warranty claim or recovery paid to Lessor.  Lessor shall make such proceeds
available for any repair, restoration or replacement to correct such warranted
condition.  Excess proceeds shall be used to reduce Lessee's Lease obligations.

11.      USE

So long as Lessee shall not be in default, Lessee shall be entitled to the
possession, use and quiet enjoyment of the Equipment during the Term and any
Renewal Term in accordance with the terms of the Lease.  Unless a purchase
option is exercised, Lessee shall deliver and surrender the Equipment to Lessor
at the end of the Term or Renewal Term in accordance with paragraph 20, hereof.
Lessee warrants that the Equipment will at all times be used and operated
solely in the conduct of Lessee's business for the purpose for which it was
designed and intended and under and in compliance with applicable laws and all
lawful acts, rules, regulations and orders of any governmental bodies or
officers having power to regulate or supervise the use of such property, except
that Lessee may in good faith and by appropriate proceedings contest the
application of any such rule, regulation or order in any reasonable manner





                                       8
<PAGE>   9
that will not adversely affect the title of Lessor to any Equipment or subject
the same to forfeiture or sale.  Lessee will not permit its rights or interests
hereunder to be subject to any lien, charge or encumbrance and will keep the
Equipment free and clear of any and all liens, charges, encumbrances and
adverse claims (except those arising from acts of Lessor).

12.      NET LEASE; LOSS AND DAMAGE

         (a)     This is a net lease.  Lessee assumes all risk of and shall
indemnify Lessor against all damage to and loss of the Equipment from any cause
whatsoever, whether or not such loss or damage is or could have been covered by
insurance.  Except as otherwise specifically provided herein, the Lease shall
not terminate and there shall be no abatement, reduction, suspension or
deferment of Interim or Periodic Rental for any reason, including damage to or
loss of the Equipment or any one or more Items.  Lessee promptly shall give
Lessor written notice of any material loss or damage, describing completely and
in detail the cause and the extent of loss and damage.  At its option, Lessee
shall (i) repair or restore the damaged or lost Items to good condition and
working order; or (ii) replace the damaged or lost Items with similar equipment
in good condition and working order; or (iii) pay Lessor in cash the Stipulated
Loss Value of the damaged or lost Items.  Upon Lessee's complying with the
foregoing, Lessor shall pay or cause to be paid over to Lessee the net proceeds
of insurance, if any, with respect to such damage or loss.  "Damage" and "loss"
shall include damages and losses of any kind whatsoever including, without
limitation, physical damage and partial or complete destruction, including
intentionally caused damage and destruction, and theft.

         (b)     If Lessee pays Lessor the Stipulated Loss Value for an Item,
then the Lease shall terminate with respect to that Item, that Item shall no
longer be deemed part of the Equipment and Lessee shall be entitled to retain
the Item.  However, it is understood that Lessor makes no representation or
warranty with respect to the Item, and further that Lessor shall have no
obligation to pay any tax with respect thereto.  In the event that Lessee pays
Lessor the Stipulated Loss Value for an Item, no further Interim Rental shall
be payable with respect to the Item, and Periodic Rental for the remainder of
the Term shall be reduced by multiplying the Cost of that Item by the Periodic
Rental Rate by the number of months then remaining in the Basic Term.

13.      STIPULATED LOSS VALUE

The Stipulated Loss Value of an Item shall be a sum computed by Lessor, which
shall not exceed the amount determined by multiplying the Cost of the Item by
the Stipulated Loss Factor as set forth in the Request to Purchase for the
Lease Year during which the loss of the Item occurs.  Stipulated Loss Value is
based on the recovery period specified in the Request to Purchase.

14.      OWNERSHIP AND MARKING

Lessee has not and by execution and performance hereof will not have or obtain
any title to the Equipment or any other interest therein except as Lessee
hereunder and subject to all the terms hereof.  Title to the Equipment shall at
all times remain in Lessor and Lessee at its expense shall protect and defend
the title of Lessor and keep it free of all claims and liens other than the
rights of Lessee hereunder and claims and liens created by or arising through
Lessor.  Lessee will treat this transaction as a lease for tax purposes and
will not claim any credit or deduction inconsistent with Lessor's ownership of
the Equipment.  On or before the delivery thereof, Lessee will cause each Item
of Equipment (to the extent practicable and, to the extent not practicable,
then each major component) to be plainly, permanently and conspicuously marked
by stenciling or by a metal tag or plate or decal affixed thereto with the
following legend:

         PROPERTY OF AND LEASED FROM METLIFE CAPITAL, LIMITED PARTNERSHIP
         10900 N.E. 4TH, SUITE 500 C-97550, BELLEVUE, WASHINGTON 98009

Lessee shall replace any such marking which may be removed or destroyed or
become illegible and keep the Equipment free from any markings or labelings
which might be interpreted as a claim of ownership thereof by Lessee or any
other person except Lessor or its assigns.

15.      LESSEE'S INDEMNITIES





                                       9
<PAGE>   10
         (a)     GENERAL INDEMNITIES.  Lessee will defend, indemnify and hold
harmless Lessor from and against any claim, cause of action, damage, liability,
cost or expense (including but not limited to legal fees and costs) which may
be asserted against or incurred in any manner by or for the account of Lessor
or Lessee (i) relating to the Equipment or any part thereof, including without
limitation the manufacture, construction, purchase, delivery, acceptance or
rejection, installation, ownership, sale, leasing, removal or return of the
Equipment, or as a result of the use, maintenance, repair, replacement,
operation or the condition thereof (whether defects are latent or
discoverable); (ii) by reason or as a result of any act or omission of Lessee
for itself; (iii) as a result of claims for patent, trademark or copyright
infringement; or (iv) as a result of product liability claims or claims for
strict liability.

         (b)     FEDERAL TAX INDEMNITIES.  If Lessor shall lose the right to
claim, suffer a disallowance of or be required to recapture all or any portion
of (i) the accelerated cost recovery deductions pursuant to Code Section 168
with respect to the Total Cost for property with recovery period(s) referred to
in the Request to Purchase, then, unless such result is due to Lessor's act or
omission (other than its exercise of remedies after default) or to a loss for
which Lessee pays the Stipulated Loss Value of the affected Equipment, Lessee
shall pay to Lessor on demand a sum equal to the amount of deductions or
credits lost by Lessor as a result of such event, plus the amount of any
interest, penalties and additions to tax payable by Lessor as a result of such
event.  The amount of lost deductions and credits to be paid by Lessee pursuant
to this Section shall be computed by Lessor so as to cause Lessor's after-tax
rate of return on investment and after-tax cash flows in respect of the Lease
to equal that which would have been realized by Lessor if such event had not
occurred, but without regard to whether Lessor has or would have had taxable
income sufficient to use the lost deductions or credits.

         (c)     Lessee shall indemnify Lessor against any and all taxes,
assessments and other charges imposed upon Lessor under the laws of any
federal, state, local or foreign government or taxing authority, as a result of
any payment made by Lessee pursuant to this Section 15.

16.      PURCHASE AND RENEWAL OPTIONS

         (a)     PURCHASE OPTION.  Lessee may purchase all, but not less than
all of the Equipment on the last day of the Term or any Renewal Term (the
"Option Date"), for cash, at the Equipment's then Fair Market Value, provided
Lessee is not then in breach or default and that Lessee gives Lessor written
notice of election to purchase at least sixty (60) days prior to the Option
Date.  Upon payment of the purchase price and all Rentals and other sums owing
or to become owing to and including the Option Date, Lessor shall transfer to
Lessee all of Lessor's right, title and interest in the Equipment, in its then
condition, without any representation or warranty other than the warranty that
the Equipment is not subject to any liens resulting from acts of Lessor.  For
purposes of this Lease, the term "Fair Market Value" shall be an amount agreed
upon by Lessor and Lessee or if such parties are unable to agree prior to the
Option Date, such value shall be determined by an appraiser chosen by mutual
agreement.  Lessee shall pay the fees and expenses of the appraiser.

         (b)     RENEWAL OPTION.  At the end of the Term or of a Renewal Term
(the "Option Date"), provided there shall be no breach or default by Lessee or
event which with the giving of notice or passage of time, or both, might mature
into an event of default, Lessee may renew the lease for such additional period
of time (the "Renewal Term") as may be agreed upon by Lessor and Lessee, by
giving Lessor written notice of election to renew at least sixty (60) days
before the Option Date.  If Lessor and Lessee do not otherwise agree on the
length of the Renewal Term, it shall be for a period of twelve (12) calendar
months.  The rental for the Renewal Term shall be the Equipment's fair market
rental value as of the first day of the Renewal Term.  If by the Option Date
the parties do not agree as to the rental, the fair market rental value shall
be determined by an independent appraiser selected by mutual agreement.  Lessee
shall pay rental installments based on Lessor's estimate of fair market rental
value until the issue is resolved, at which time appropriate additional
payments or credits shall be made or given.  Lessee shall pay the fees and
expenses of the appraiser.  All provisions of the Lease shall continue in full
force and effect during a Renewal Term except for the amount of the rental.

17.      LESSOR MAY PERFORM

If Lessee at any time shall fail to pay to any person any sum which Lessee is
required by the Lease to pay or shall fail to do or perform any other thing
Lessee is required by the Lease to do or perform, Lessor at its option may pay
such sum or do or perform such thing, and Lessee shall reimburse Lessor on
demand for the amount of such payment





                                       10
<PAGE>   11
and for the cost and expense which may be incurred by Lessor for such acts or
performance, together with interest thereon at the Default Rate from the date
of demand until paid.

18.      DEFAULT

         (a)     EVENTS OF DEFAULT.  Each of the following shall constitute an
event of default: (i) failure to perform and comply with the provisions and
conditions of Section 8 hereof or to pay any sum, including installments of
rental, on the date when due; (ii) failure to perform and comply with any other
provision or condition of the Lease within thirty (30) days after Lessor shall
have given Lessee written notice of default with respect thereto, or failure to
make good, within thirty (30) days after written notice by Lessor to Lessee,
any representation or warranty, whether made in the Lease or in any
certificate, agreement, instrument or statement, including income and financial
statements, which shall prove to have been incorrect in any material respect
when made; (iii) any event of default occurs with respect to any obligations of
Lessee to Lessor on or with respect to any transactions, debts, undertakings or
agreements other than the Lease; (iv) the failure of Lessee generally to pay
debts as they become due in the ordinary course of business or the filing of
any application for the appointment of a receiver for a major part of Lessee's
assets or the filing of any petition or application by or against Lessee under
any present or future laws for the relief of debtors or for the subjection of
the property of a debtor to the control of any court, tribunal or agency for
the benefit of creditors, including proceedings under the Bankruptcy Code, if
the proceeding commenced by such filing shall not be dismissed within sixty
(60) days from the date of filing; (v) the execution by Lessee of a general
assignment for the benefit of creditors; (vi) the merger, consolidation,
reorganization, conversion to a Subchapter "S" status or dissolution of a
corporate or partnership Lessee, which has a materially adverse effect upon
Lessor's position under the Lease.

         (b)     EFFECT ON REQUEST TO PURCHASE.  Upon the occurrence of an
Event of Default, Lessor shall have no further obligation to Lessee to purchase
Equipment or Items or to lease any thereof to Lessee.

         (c)     REMEDIES.  (i) Upon the occurrence of an event of default as
provided above, Lessor may at its option (1) proceed by appropriate court
action or actions, either at law or in equity, to enforce performance by the
Lessee of the applicable covenants of this Lease or to recover damages for the
breach thereof; or (2) by notice in writing to the Lessee terminate Lessee's
right of possession of the Equipment, whereupon all rights of the Lessee to use
the Equipment shall absolutely cease and terminate, but Lessee shall remain
liable as herein provided.  Upon such a termination, Lessee at its expense
shall redeliver the Equipment to Lessor.  If Lessee shall fail to do so, Lessor
may retake possession of the Equipment by entering upon any premises at any
reasonable time and thereafter Lessor may hold, possess, sell, upgrade, lease
to others or enjoy the same, free from any right of Lessee, or its successors
or assigns.  If Lessor is required to retake possession, Lessee upon demand
shall reimburse Lessor for all costs and expenses relating thereto.
Notwithstanding such redelivery or retaking Lessor shall have a right to
recover from Lessee any and all amounts which under the terms of the Lease may
be then due or which may have accrued to the date of such termination, and also
to recover forthwith from the Lessee its damages for loss of a bargain and not
as a penalty, an amount equal to the higher of Fair Market Value or the
Stipulated Loss Value of the Equipment as of the rent payment date on or next
preceding the date of default, less: (1) the amount Lessor in fact receives
from the sale of the Equipment, after deduction of all estimated expenses of
such sale (Equipment which Lessor is unable to recover shall at Lessor's option
be deemed worthless.) or, (2) at Lessor's election, the present value of the
non-cancellable regularly scheduled rentals receivable from a subsequent lease
of all or part of the Equipment entered into by Lessor (discounted at the
Default Rate), and taking into account only the rentals receivable from the
commencement date of such subsequent lease until the end of the Lease Term
specified in the Request to Purchase for such Equipment.  In addition, Lessee
shall be liable to Lessor for all costs and expenses incurred by Lessor by
reason of Lessee's breach or default.  In addition to the foregoing, the Lessee
shall be liable for interest on any of the above referenced amounts from and
after the due date at the Default Rate, or the legal limit, whichever is
smaller. (ii) "Lessor's costs and expenses incurred by reason of Lessee's
breach or default" shall include, without limitation, costs and expenses of
receiving or retaking possession of the Equipment, storing, holding,
transporting, insuring, caring for, servicing, maintaining and renting the
Equipment or Items and collecting rents and professional fees and expenses with
respect to or incurred by reason of the breach or default, including legal fees
and expenses for advice and legal services in any actions or proceedings which
Lessor may commence or in which Lessor may appear or participate to exercise or
enforce any rights or remedies or to protect or preserve any rights or
interests, and in all reviews of and appeals from any such actions or
proceedings.  (iii) The "Default Rate" of interest shall be a rate per





                                       11
<PAGE>   12
annum computed monthly which shall be five (5) percentage points above the
prime rate, but not greater than the maximum rate, if any, limited by
applicable law.

19.      RIGHTS CUMULATIVE

Unless otherwise expressly provided herein, all rights and remedies of Lessor
are concurrent and cumulative.  The exercise or partial exercise of any remedy
shall not restrict Lessor from further exercise of that remedy or any other
remedy.

20.      SURRENDER

At any time that Lessee is required to deliver the Equipment to Lessor,  Lessee
shall immediately cease using the Equipment and at Lessee's expense shall
redeliver and surrender the Equipment to Lessor in good order, condition and
repair, ordinary wear and tear excepted, securely crated and safely packed, at
a place to be designated by Lessor in the State where the Equipment by the
terms of the Request to Purchase is required to be kept, and, if Lessor so
specifies, loaded FOB a common or contract carrier designated by Lessor.

21.      HOLDOVER

If Lessee shall not immediately redeliver and surrender any Item of Equipment
to Lessor when required by the terms hereof, Lessee shall pay Lessor, at such
time or times as Lessor may demand, a sum equal to a one-month installment of
Periodic Rental for each calendar month or fraction of a month during which
such failure to redeliver and surrender continues.

22.      INSPECTION; REPORTS

Lessor, its agents and employees shall have the right to enter upon any
premises where the Equipment or Items are then located to inspect and examine
the same during normal business hours and at any other times if Lessor
reasonably believes any Items or Lessor's rights are in jeopardy of damage or
loss.  So long as Lessee's not in default, Lessor shall give Lessee not less
than twenty-four (24) hours notice of such inspection.  Lessee shall
immediately give Lessor written notice of any damage to or loss of the
Equipment or any Items from any cause, including without limitation damage or
loss caused by accident, the elements, intentional acts and theft.  Such notice
shall set forth an itemization of the affected Items and a detailed account of
the event, including names of any injured persons and a description of any
damaged property arising from any such event or from any use or operation of
the Equipment or any Items.  All rights granted to Lessor herein are for the
benefit of Lessor and shall not be construed to impose any obligation on
Lessor, whether or not Lessor makes any inspections or receives any reports.

23.      FINANCIAL AND OTHER DATA

During the Term and any Renewal Term, Lessee: (a) shall furnish Lessor annual
balance sheets and profit and loss statements of Lessee and any guarantor of
Lessee's obligations accompanied, at Lessor's request, by the audit report of
an independent certified public accountant acceptable to Lessor; and (b) at
Lessor's request, shall furnish Lessor all other financial information and
reports reasonably requested by Lessor at any time, including quarterly or
other interim balance sheets and profit and loss statements of Lessee and any
such guarantor.  Lessee shall furnish such other information as Lessor may
reasonably request at any times concerning Lessee and its affairs.

24.      WARRANTY OF INFORMATION

Lessee warrants that all information furnished and to be furnished to Lessor is
accurate and that all financial statements it has furnished and hereafter may
furnish Lessor, including operating statements and statements of condition, are
and will be prepared in accordance with generally accepted accounting
principles, consistently applied, and reasonably reflect and will reflect, as
of their respective dates, results of the operations and the financial
condition of Lessee and any other entity they purport to cover.

25.      NON-WAIVER

Neither the acceptance by Lessor of any payment or any other performance, nor
any act or failure of Lessor to act or to exercise any rights, remedies or
options in any one or more instances shall constitute a waiver of any such
right, remedy or option or of any other then existing or thereafter accruing
right, remedy or option, or of any breach of





                                       12
<PAGE>   13
default then existing or thereafter occurring.  No purported waiver by Lessor
of any right, remedy, option, breach or default shall be binding unless in
writing and signed by an officer of Lessor.  A written waiver by Lessor of any
right, remedy, option, breach or default shall not constitute a waiver or any
other then existing or thereafter accruing right, remedy or option or of any
other then existing or thereafter occurring breach or default.

26.      NOTICES; PAYMENTS

         (a)     A written notice may be given: (i) by delivering the same to a
corporate officer of the party to whom it is directed (the "Addressee"), or to
a general partner if the Addressee is a partnership, or to the owner if the
Addressee is a sole proprietorship; or (ii) by mailing the notice to the
Addressee by first class mail, registered or certified, with postage prepaid,
addressed to the Addressee at the address following its name in the opening
paragraph of the Request to Purchase or to such other address as Addressee may
specify by notice in writing given in accordance with this Section.  A notice
so mailed shall be deemed given on the third business day following the date of
mailing.  A "business day" shall be any day that is not a Saturday or Sunday or
legal holiday.

         (b)     The Lessee shall make all payments to Lessor at the place
where the notice is to be mailed to Lessor pursuant to subparagraph (a).
Payments are deemed paid when received by Lessor.

27.      ASSIGNMENT

         (a)     Lessee shall not assign the Lease or any rights in or to the
Equipment or Items.  Any attempted assignment shall be of no effect, unless
Lessor first shall have consented thereto in writing.  Lessor's consent to an
assignment in any one or more instances shall not impose any obligation upon
Lessor to consent to any other or further assignments.  Lessor's consent to an
assignment shall not release Lessee from any obligations with respect to the
Lease unless expressly so stated in the written consent.

         (b)     All rights of Lessor hereunder may be assigned, pledged,
mortgaged, transferred or otherwise disposed of, either in whole or in part,
without notice to Lessee but subject always to the rights of Lessee under this
Lease.  If Lessee is given notice of any such assignment, Lessee shall
acknowledge receipt thereof in writing.  In the event that Lessor assigns this
Lease or the rent due or to become due hereunder or any other interest herein,
whether as security for any of its indebtedness or otherwise, no breach of
default by Lessor hereunder or pursuant to any other agreement between Lessor
and Lessee, should there be one, shall excuse performance by Lessee of any
provision hereof, it being understood that in no event of such default or
breach by Lessor that Lessee shall pursue any rights on account thereof solely
against Lessor.  No such assignee shall be obligated to perform any duty,
covenant or condition requested to be performed by Lessor under the terms of
this Lease.

28.      SURVIVAL

The representations warranties, indemnities and agreements of Lessee, and
Lessee's obligations under any and all provisions of the Lease, shall survive
the expiration or other termination of the Lease, shall be binding upon its
successors and assigns and are expressly made for the benefit of and shall be
enforceable by Lessor and its successors and assigns.

29.      MISCELLANEOUS

         (a)     The term "Lessor" shall mean the Lessor named herein and its
successors and assigns.

         (b)     Whenever the context so requires, any pronoun gender includes
all other genders, and the singular includes the plural.  If more than one
person constitute Lessee, whether as a partnership or otherwise, all such
persons are and shall be jointly and severally liable for all agreements,
undertakings and obligations of Lessee.

         (c)     All captions and section, paragraph and other divisions and
subdivisions are for convenience of reference only and shall not affect the
construction, interpretation or meaning of the agreement or Lease or of any of
the provisions thereof.

         (d)     This Lease shall be governed by and construed according to the
law of the State of Washington.

         (e)     This Lease shall be binding upon and, except as limited in
Section 27 hereof, shall inure to the benefit of Lessor and Lessee and their
respective successors and assigns.

         (f)     This lease cannot be cancelled or terminated except as
expressly provided herein.  

         (g)     Wherever Lessor's consent is required hereunder, such consent 
will not be unreasonably withheld.





                                       13
<PAGE>   14
         (h)     Lessee's obligation to pay or reimburse Lessor for expenses as
provided hereunder shall be limited to reasonable expenses.

30.      LESSOR'S DISCLAIMER

Lessee acknowledges and agrees that it has selected both the Equipment of the
type and quantity which is the subject of this Lease and the supplier from whom
Lessor purchased the Equipment.  LESSOR MAKES NO REPRESENTATION OR WARRANTY,
EXPRESS OR IMPLIED, AS TO THE DESIGN, COMPLIANCE WITH SPECIFICATIONS,
CONDITION, QUALITY, WORKMANSHIP, OR THE SUITABILITY, ADEQUACY, OPERATION, USE
OR PERFORMANCE OF THE EQUIPMENT OR AS TO ITS MERCHANTABILITY OR FITNESS FOR ANY
PARTICULAR PURPOSE.  ANY DELAY IN DELIVERY SHALL NOT AFFECT THE VALIDITY OF
THIS LEASE.  The Lessee understands and agrees that neither the supplier nor
any salesman or any agent of the supplier is an agent of Lessor.  No salesman
or agent of supplier is authorized to waive or alter any term or condition of
this Lease, and no representation as to the Equipment or any other matter by
the supplier shall in any way affect Lessee's duty to pay the rent and perform
its obligations as set forth in this Lease.  Lessor shall not be liable to
Lessee for any incidental, consequential, or indirect damages or for any act,
neglect, omission, breach or default by any third party.

31.      NO AFFILIATION WITH SUPPLIERS

Lessee warrants that neither it nor any of its officers, directors (if a
corporation) or partners (if a partnership) has, directly or indirectly, a
substantial financial interest in the manufacturer or supplier of any Equipment
except as previously disclosed in writing to Lessor.

32.      ENTIRE AGREEMENT.

This Lease and any Requests to Purchase hereto shall constitute the entire
agreement between the parties and shall not be altered or amended except by an
agreement in writing signed by the parties hereto or their successors or
assigns.

IN WITNESS WHEREOF Lessor and Lessee have signed this agreement as of the day
and year first hereinabove written.

LESSOR:                                  LESSEE:

METLIFE CAPITAL,                         SEITEL GEOPHYSICAL, INC.
Limited Partnership                      dba Eagle Geophysical

By METLIFE CAPITAL CORPORATION, 
General Partner                          By:  /s/ [illegible signature]

By:  /s/ [illegible signature]           Its  President

Its: Sr. Vice President                  By ___________________________________

                                         Its __________________________________






                                       14

<PAGE>   1

McCULLAGH                                                                10.7.1
- --------------------------------------------------------------------------------
(GE) A Unit of GE Capital Fleet Services

MASTER LEASE AGREEMENT                                          CUSTOMER # 61824
(NATIONAL)
- --------------------------------------------------------------------------------

This Lease Agreement (herein the "Agreement") is made and entered into by and
between Gelco Corporation, a Minnesota corporation with its administrative
offices in Eden Prairie, Minnesota, doing business as MCCULLAGH LEASING (herein
the "LESSOR"), and Seitel Geophysical, Inc., a/an Delaware corporation (herein
the "LESSEE").

         (1)     LEASE OF VEHICLES:

                 (a)      LEASE.  LESSOR hereby agrees to lease to LESSEE and
LESSEE hereby agrees to lease from LESSOR certain automobiles, trucks, trailers
and/or equipment (herein "Vehicle(s)") from time to time during the term of
this Agreement.

                 (b)      NEW VEHICLE ORDER.  LESSEE shall evidence its
agreement to lease a Vehicle hereunder by executing a written or electronic New
Vehicle Order for such Vehicle on the form from time to time established by
LESSOR.  The New Vehicle Order shall set forth complete specifications as to
each Vehicle including all equipment necessary to its lawful operation, and the
place and desired date of delivery, and the lease term of the Vehicle (herein
"Lease Term").  In the event any New Vehicle Order is canceled by LESSEE,
LESSEE agrees to reimburse LESSOR for any expenses or losses incurred as a
result of such cancellation.

                 (c)      ACCEPTANCE AND DELIVERY.  LESSEE's execution of a New
Vehicle Order shall obligate LESSEE to lease the Vehicle specified therein
effective upon its delivery to LESSEE.  At the time of delivery of such
Vehicle, such New Vehicle Order, together with the Delivery Receipt for such
Vehicle, if any, shall become a part of this Agreement.  The Delivery Receipt
shall be on the form from time to time established by LESSOR.  LESSEE's
acceptance of a Vehicle shall constitute a warranty by LESSEE that the party
accepting such Vehicle has the authority to do so on behalf of LESSEE, and that
the Vehicle conforms to the New Vehicle Order.  Upon acceptance of each
Vehicle, LESSEE agrees that LESSEE's obligation to pay rent and other amounts
hereunder with respect to such Vehicle shall be unconditional; and LESSEE shall
not be entitled to any reduction of, or setoff against, such amounts (provided,
however, that any payment by LESSEE shall not prejudice LESSEE's right to claim
adjustment or reimbursement), nor shall this Agreement terminate or the
obligations of LESSEE be affected by reason of any defect in, damage to or loss
of possession, use or destruction of any Vehicle from any cause, unless such
obligations have been terminated pursuant to the express terms hereof.  When a
Vehicle is available for delivery, LESSEE shall take delivery within five (5)
business days of notice.

         (2)     TERM:

                 (a)      TERM OF AGREEMENT.  The term of this Agreement shall
be indefinite commencing on the date hereof, and continuing until canceled in
the manner set forth in this Agreement, or until either party hereto terminates
the same upon thirty (30) days' written notice to the other.  Even after the
cancellation or termination of this Agreement, all Vehicles then leased by
LESSEE shall continue to be subject to the terms, conditions and covenants
contained in this Agreement, until each of such terms, conditions and covenants
has been fulfilled and no such cancellation or termination shall affect any
rights or obligations in existence prior to the effective date of such
cancellation or termination.  Vehicles for which New Vehicle Orders have been
signed by LESSEE but which Vehicles have not been delivered to LESSEE





1991 Gelco Corporation             1 of 11
<PAGE>   2
as of the effective date of such cancellation or termination, at the option of
LESSOR, shall be deemed leased hereunder.

                 (b)      VEHICLE LEASE TERM.  The Lease Term for each Vehicle
shall be as specified in the respective New Vehicle Order.  With respect to any
Vehicle leased pursuant t this Agreement, the minimum non-cancelable term of
lease for such Vehicle shall be twelve (12) months, commencing on the date of
delivery of such Vehicle to LESSEE, and thereafter the term of the lease shall
be on a month-to-month basis.  Unless a different Lease Term is set forth in
the New Vehicle Order, the term of lease for each Vehicle shall not extend
beyond a maximum of fifty (50) months for automobiles, seventy-two (72) months
for light trucks and ninety-six (96) months for medium and heavy duty trucks.
In no event shall LESSEE keep any Vehicle beyond the Lease Term of the Vehicle
set forth in the New Vehicle Order for such Vehicle; or, if a Lease Term is,
for any reason, not so specified beyond the maximum term of lease provided
herein.

         (3)     LESSEE'S OPERATION OF VEHICLES:  LESSEE shall use the Vehicles
in the United States for business purposes and in a safe and lawful manner, and
shall comply with all federal, state, county and municipal statutes, ordinances
and regulations which may be applicable to the leasing, use or operation of the
Vehicles.  In addition, LESSEE shall prepare and furnish to LESSOR all
documents, returns or forms legally required to be prepared by LESSEE.  LESSEE
shall be solely responsible for any fines or penalties assessed for violations
of any statute, ordinance, bylaw or regulation of any governmental authority,
as a result of the use or operation of the Vehicles by any of LESSEE's
employees, agents, sublessees, subcontractors, or any third party, and shall
keep the Vehicles free from any liens and encumbrances.  LESSEE agrees to
operate only those Vehicles which have adequate insurance coverage and to
comply with all conditions of insurance related to the Vehicles, to maintain
the Vehicles and all accessories and equipment thereon in safe and good
mechanical condition and running order at all times and to furnish all
supplies, accessories, and other essentials required for the use or operation
of the Vehicles.  LESSEE shall comply and shall cause all persons operating the
Vehicles to comply with such instructions covering the operation and
maintenance of the Vehicles as LESSOR may furnish from time to time, and with
the manufacturer's operating procedures and warranty requirements.  LESSEE
shall not make any addition, alteration, or improvement to a Vehicle without
the prior written consent of LESSOR, which shall not be unreasonably withheld.
All repairs, replacement parts, additions, alterations, or improvements made to
a Vehicle become the property of LESSOR and shall be surrendered with the
Vehicle at the termination or cancellation of that Vehicle's Lease Term.  In no
event will the Vehicles be used to transport any hazardous substances or for
the transportation of persons for hire.

         (4)     WARRANTIES:

                 (a)      Assignment of Manufacturer's Warranties.  LESSOR
hereby assigns to LESSEE, for and during the Lease Term of a Vehicle, any
warranty of the manufacturer, express or implied, issued on such Vehicle, and
hereby authorizes LESSEE to obtain the customary service furnished by the
manufacturer in connection therewith, at LESSEE's expense.  LESSEE ACKNOWLEDGES
AND AGREES LESSOR IS NOT THE MANUFACTURER, DESIGNED OR A DISTRIBUTOR OF THE
VEHICLES, AND THAT EACH VEHICLE IS OF A SIZE, DESIGN, CAPACITY AND MANUFACTURE
SELECTED BY LESSEE AND SUITABLE FOR ITS PURPOSES.

                 (b)      LESSOR DISCLAIMER.  THERE ARE NO WARRANTIES OR OTHER
RIGHTS PROVIDED BY LESSOR OR THE MANUFACTURER OTHER THAN THE MANUFACTURER'S
WARRANTIES ASSIGNED TO LESSEE, COPIES OF WHICH LESSEE ACKNOWLEDGES HAVING
PREVIOUSLY RECEIVED.  LESSOR MAKES NO REPRESENTATION OR WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, WITH RESPECT TO ANY VEHICLE, INCLUDING, BUT NOT LIMITED TO:
THE MERCHANTABILITY OF A VEHICLE OR ITS FITNESS FOR A PARTICULAR PURPOSE; THE
DESIGN,





1991 Gelco Corporation             2 of 11
<PAGE>   3
QUALITY OR CAPACITY OF A VEHICLE; COMPLIANCE OF A VEHICLE WITH THE REQUIREMENTS
OF ANY LAW, RULE, SPECIFICATION OR CONTRACT PERTAINING THERETO; IT BEING AGREED
THAT THE VEHICLES ARE LEASED "AS IS."  WITHOUT LIMITING THE GENERALITY OF THE
FOREGOING, LESSOR SHALL NOT BE LIABLE TO LESSEE, ITS CUSTOMERS, OR THIRD
PARTIES FOR ANY DEFECTS, EITHER LATENT OR PATENT, IN ANY VEHICLE, OR FOR ANY
DIRECT, INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES OF ANY KIND OR NATURE
DIRECTLY OR INDIRECTLY ARISING OUT OF THIS AGREEMENT OR ANY VEHICLE, OR FOR ANY
DAMAGES BASED ON STRICT OR ABSOLUTE TORT LIABILITY OR NEGLIGENCE, OR FOR ANY
LOSS OF USE OF ANY VEHICLE, OR FOR ANY INTERRUPTION IN LESSEE'S BUSINESS BY ITS
INABILITY TO USE ANY VEHICLE FOR ANY REASON.  LESSOR SHALL HAVE NO LIABILITY
FOR ANY FAILURE OF OR DELAY IN DELIVERY OF THE VEHICLES OR FOR THE BREACH OF
ANY REPRESENTATION OR WARRANTY MADE BY THE MANUFACTURER.  LESSOR MAKES NO
REPRESENTATION AS TO THE TREATMENT BY LESSEE OF THIS LEASE FOR FINANCIAL
STATEMENT OR TAX PURPOSES.

         (5)     COSTS, EXPENSES, FEES AND CHARGES:  LESSEE covenants that it
will pay all costs, expenses, fees, charges and taxes (other than federal
income or state income taxes of LESSOR) incurred in connection with the
titling, registration, delivery, purchase, sale, rental, installation, use or
operation of the Vehicles during the term of this Agreement in addition to the
rental herein provided.  If LESSOR incurs or is compelled to pay any of such
costs, LESSEE shall, upon demand from LESSOR, promptly reimburse LESSOR for the
same.  If LESSOR pays any fines, tickets, penalties or other charges related to
a violation by LESSEE of any local, state or federal law or regulation, or if
LESSOR is served with any legal process, LESSEE shall, upon demand, promptly
reimburse LESSOR for the same and pay the then current administrative charge
assessed by LESSOR for processing each fine, ticket, penalty or other such
charge on behalf of LESSEE.

         (6)     REGISTRATION PLATES, ETC.:  LESSEE shall at its own expense,
obtain in the name of LESSOR all registration plates and other plates, permits
or licenses required to be obtained in connection with the Vehicles, or related
to their operation or use except for the initial registration plates which
LESSOR shall obtain at LESSEE'S expense.  LESSOR shall issue to LESSEE for such
purpose, appropriate limited powers of attorney and/or such authority as may be
necessary or required.  Both LESSOR and LESSEE covenant and agree to cooperate
and to furnish any and all information or documentation which may be reasonably
necessary to enable compliance with the provisions of this Section or any
local, state or federal law or regulation.  LESSEE shall not, without LESSOR's
written consent, permit any Vehicle to be located in a state other than the
state in which such Vehicle is then titled for any continuous period of time
that would require such Vehicle to become subject to the titling and/or
registration laws of such other state.

         (7)     RENTAL CHARGES:

                 (a)      MONTHLY RENTAL.  LESSEE will pay LESSOR and LESSOR
will accept as payment from LESSEE, as rental for each Vehicle, the Monthly
Rental set forth in the Lease Schedule hereto, as such Lease Schedule may be
amended from time to time, plus all other rental charges provided for in this
Agreement.  Monthly Rental shall be paid as follows:

                 (i)      The payment of Monthly Rentals for each Vehicle shall
         begin on the first (1st) day of the calendar month in which the
         Vehicle is delivered to LESSEE, if delivered on or before the
         fifteenth (15th) day of the month, or on the first (1) day of the next
         succeeding calendar month, if delivered on or after the sixteen (16th)
         day of the month.

                 (ii)     The payment of Monthly Rentals for each Vehicle shall
         begin on the first (1st) day of the calendar month in which the
         Vehicle is delivered to LESSEE, if delivered on or before the





1991 Gelco Corporation            3 of 11
<PAGE>   4
         fifteenth (15th) day of the month, or on the first day of the next
         succeeding calendar month, if delivered on or after the sixteenth
         (16th) day of the month.

                 (iii)    Monthly Rentals shall be paid on the first (1st) day
         of each calendar month during the rental payment period with respect
         to each Vehicle.  If a Vehicle is delivered to Lessee on or before the
         fifteenth (15th) day of a month, the first month's rental shall be
         paid on the first (1st) day of the next succeeding calendar month,
         together with the rental payment for such next succeeding calendar
         month.

Monthly Rentals shall be paid without abatement, setoff, counterclaim or
defense for any reason whatsoever, regardless of the actual use of the Vehicles
by LESSEE.

         LESSEE acknowledges that the Monthly Rental has been established based
on a presumed after-tax return to LESSOR.  If any changes in federal or state
tax laws or regulations cause LESSOR's after-tax return to be reduced, LESSOR
may, in compensation, prospectively adjust the Monthly Rental.

                 (b)      INVOICES.  LESSOR shall render to LESSEE each month
an invoice for Monthly Rentals due that month for all Vehicles, together with a
statement of all miscellaneous fees, taxes, costs, expenses, and charges due to
LESSOR from LESSEE.  Time is of the essence.  All charges are due and payable
upon receipt of an invoice.  LESSEE shall pay to LESSOR a late payment penalty
in the amount of one and one-half percent (1 1/2%) or the highest legal
interest rate, whichever is less, per month or fraction thereof on any invoice
the payment of which is not in the possession of LESSOR on or before the tenth
(10th) day from the date of such invoice (or if such 10th day falls on a
weekend or holiday, then the immediately preceding business day).  LESSEE
agrees to carefully review each invoice or other statement provided by LESSOR.
All invoices and statements rendered by LESSOR shall be presumed correct and
accurate and constitute an account stated between LESSOR and LESSEE unless,
within thirty (30) days after receipt thereof, LESSEE shall deliver written
objection thereto specifying any errors in the invoice or statement.  In such
event, LESSOR's sole liability and LESSEE's exclusive remedy shall be to make
appropriate adjustments in LESSEE's account.  All charges are based upon
LESSOR's standard operating routines, computer systems capabilities, and
existing business policy and are subject to change upon notice.  Additional
services and special handling required by LESSEE will be subject to
negotiation.  Nothing contained in this Agreement shall prevent LESSOR from
obtaining compensation from manufacturers, suppliers or other vendors.

         (8)     SURRENDER AND DISPOSITION OF VEHICLES:

                 (a)      EARLY TERMINATION.  So long as LESSEE is not in
default, LESSEE may, at any time after the minimum non-cancelable term of lease
of twelve (12) months, terminate the Lease Term of any Vehicle by giving LESSOR
written notice of surrender as provided below.  If LESSEE surrenders a Vehicle
prior to the end of the minimum Lease Term, LESSEE shall pay the Interest
Adjustment Charge provided for in the Lease Schedule, if any.

                 (b)      NOTICE OF SURRENDER.  At the end of the Lease Term or
in the event of an early termination as provided above, LESSEE shall provide
LESSOR with written notice of its desire to surrender a Vehicle.  LESSOR shall
use its best efforts to pick up or to cause a Vehicle to be picked up within
thirty (30) days of the date of such notice.  In such notice, LESSEE may
designate the date upon which it desires a Vehicle to be picked up, and LESSOR
shall endeavor to accommodate such request.  Vehicles shall continue to be
subject to the terms and conditions of this Agreement through the date of
surrender, which shall be the date LESSOR takes actual possession of the
respective Vehicle.





1991 Gelco Corporation             4 of 11
<PAGE>   5
                 (c)      SURRENDER.  Any Vehicle that LESSOR advises LESSEE is
outside of its custom pickup area shall be surrendered to LESSOR at such place
as LESSOR and LESSEE may agree upon in writing.  Each vehicle, whether picked
up by LESSOR or dropped off by LESSEE, shall be surrendered in good and safe
operating condition.  At the time of surrender, LESSEE shall complete, sign and
deliver to LESSOR, a Used Vehicle Condition Report on a form supplied by LESSOR
with respect to such Vehicle.  Such surrender shall include all license plates,
registration certificates, documents of title and odometer certifications and
other documentation necessary to effect the sale or other disposition of the
Vehicle.  LESSEE shall remove any personal property prior to surrender.  Any
personal property left in a Vehicle after surrender shall be deemed abandoned
and may be disposed of by LESSOR without liability.  LESSOR shall sell each
Vehicle within a reasonable time after the date of surrender.

                 (d)      DISPOSITION OF VEHICLES.  LESSOR shall, and LESSEE
may, solicit from prospective purchasers in the wholesale vehicle market cash
bids for surrendered Vehicles on an AS IS, WHERE IS BASIS, WITHOUT RECOURSE OR
WARRANTY.  Such Vehicles shall be sold in a commercially reasonable manner for
cash payable in full upon delivery.  If repairs to a Vehicle surrendered by
LESSEE shall be deemed advisable by LESSOR before sale, LESSOR shall so notify
LESSEE and LESSEE shall pay all costs for such repairs.  Without limiting the
generality of the foregoing, LESSOR shall have the right to sell Vehicles to
any dealer or broker or any other party, including to or through companies
affiliated with LESSOR.

                 (e)      TERMINAL RENTAL ADJUSTMENT.  From the proceeds
realized from any sale of a Vehicle, there shall first be deducted all direct
expenses paid or incurred by LESSOR in connection with such Vehicle and its
sale from time of surrender through date of sale, the balance remaining to
constitute the net proceeds (herein the "Net Proceeds").  The Net Proceeds from
the sale of any such Vehicle shall be payable to LESSOR.

                          (i)     If the Net Proceeds exceed the Capitalized
                 Cost (as defined in the Lease Schedule) of such Vehicle
                 reduced by an amount equal to the aggregate of the
                 amortization (calculated using the amortization rate set forth
                 in the Lease Schedule) paid on such Vehicle (herein the
                 "Unamortized Book Value"), LESSOR shall retain an amount equal
                 to the Unamortized Book Value on the Vehicle sold, and LESSEE
                 shall receive the remaining excess as a refund of rental;
                 provided, however, if LESSEE is in default hereunder, such
                 remaining excess, if any, shall be applied to reduce the
                 amount of default.

                          (ii)    If the Net Proceeds are less than the
                 Unamortized Book Value of the Vehicle sold, LESSEE shall pay
                 LESSOR, in cash, as a rental charge adjustment, the amount of
                 such deficiency.

         (9)     INSURANCE:

                 (a)      COVERAGES.  LESSEE shall, at LESSEE's expense,
procure from a responsible insurance company acceptable to LESSOR, prior to
delivery of each Vehicle, and shall maintain during the time that any Vehicles
are leased by LESSEE from LESSOR, the following insurance coverage:

                          (i)     Public liability and property damage
                 insurance (comprehensive automobile liability) insuring
                 LESSOR, and its assigns, if any, LESSEE and any person having
                 possession of or using a Vehicle, against liability for death,
                 bodily injury, and property damage resulting from ownership,
                 maintenance, use or operation of a Vehicle with limits of
                 coverage as LESSOR may require but in no event less than one
                 million dollars





1991 Gelco Corporation               5 of 11
<PAGE>   6
                 ($1,000,000.00) combined single limit per occurrence (five
                 million dollars ($5,000,000.00) for multi- passenger or I.C.C.
                 regulated vehicles).

                          (ii)    Comprehensive and collision insurance
                 insuring LESSOR, and its assigns, if any, against loss and/or
                 damage to each Vehicle arising out of any risk covered by such
                 insurance (including without limitation, fire, theft,
                 casualty, malicious mischief, falling objects, missiles, glass
                 breakage, smoke, riot or civil commotion) with limits of
                 coverage as LESSOR may require but in no event less than the
                 actual cash value of each Vehicle subject to a five hundred
                 dollar ($500.00) deductible.  In the event of loss or damage
                 to the Vehicle, LESSEE agrees to immediately reimburse LESSOR
                 the amount of the deductible hereunder, without regard to who
                 is responsible.

The above insurance shall also include the following, in amounts not less than
the applicable minimum legal requirements: (i) uninsured/underinsured motorist
coverage, and (ii) no fault protection.  LESSEE shall in addition provide
general liability insurance covering LESSEE's indemnification responsibilities
hereunder.

                 (b)      CONDITIONS.  LESSOR shall be named as an Additional
Insured on the required liability and property damage insurance, and as the
Loss Payee on the required collision and comprehensive damage insurance.  All
insurance policies required hereunder shall provide for thirty (30) days' prior
written notice to LESSOR and its assigns, if any, of any cancellation or
reduction in coverage.  LESSEE shall deliver to LESSOR, prior to the delivery
of any Vehicle to LESSEE, or prior to the effective date of any cancellation or
expiration of such insurance as the case may be, the insurance policy, a
certificate or other satisfactory evidence of the maintenance of the insurance
required hereunder.  LESSOR shall be under no duty to examine such policies,
certificates, or other evidence of insurance, or to advise LESSEE in the event
that its insurance is not in compliance with this Agreement.  LESSEE, in the
event of default, hereby appoints LESSOR as LESSEE's attorney-in-fact to
receive payment of and endorse all checks and other documents and to take nay
other actions necessary to pursue insurance claims and recover payments if
LESSEE fails to do so.  Any expense of LESSOR in adjusting or collecting
insurance shall be borne by LESSEE.

                 (c)      COOPERATION.  LESSEE, its drivers, employees and
agents shall cooperate fully with LESSOR and the insurance carriers insuring
the hazards enumerated herein in the investigation, defense and prosecution of
any and all claims or suits arising from the operation of the Vehicles.  If any
claim is made or action commenced for death, personal injury or property damage
resulting from the ownership, maintenance, use or operation of any Vehicle,
LESSEE shall promptly notify LESSOR thereof and forward to LESSOR a copy of
every demand, notice, summons or other process received in connection
therewith.  LESSEE shall furnish to LESSOR a report of any accident involving a
Vehicle (on the form furnished by the insurer) within three (3) days of such
accident.  LESSEE shall make all filings or reports required by state, local or
municipal law or regulations as a result of any accident involving a Vehicle.

         (10)    INDEMNIFICATION BY LESSEE:  LESSEE COVENANTS AND AGREES TO
INDEMNIFY, SAVE HARMLESS AND DEFEND LESSOR, ANY EMPLOYEE OF LESSOR, AND ANY
PARENT, SUBSIDIARY OR AFFILIATE OF LESSOR, AGAINST ANY AND ALL LIABILITY,
CLAIMS FOR LOSS, DAMAGE, OR INJURY AND FROM AND AGAINST ANY SUITS, ACTIONS, OR
LEGAL PROCEEDINGS OF ANY KIND BROUGHT AGAINST LESSOR FOR OR ON ACCOUNT OF ANY
PERSON(S) OR LEGAL ENTITY, OR ON ACCOUNT OF ANY INJURIES RECEIVED OR SUSTAINED
BY ANY PERSON(S) OR LEGAL ENTITY IN ANY MANNER, DIRECTLY OR INDIRECTLY CAUSED
BY, INCIDENT TO, OR SUSTAINED BY ANY PERSON(S) OR LEGAL ENTITY IN ANY MANNER,
DIRECTLY OR INDIRECTLY CAUSED BY, INCIDENT TO, OR GROWING OUT OF WHOLLY OR IN
PART, THE LEASING,





1991 Gelco Corporation            6 of 11
<PAGE>   7
MAINTENANCE, USE, CONDITION (INCLUDING, BUT NOT LIMITED TO, PATENT OR LATENT
DEFECTS WHETHER OR NOT DISCOVERABLE BY LESSOR OR LESSEE, PRODUCT LIABILITY
CLAIMS, AND THE CONDITION OF ANY VEHICLE UPON SALE OR OTHER DISPOSITION),
OPERATION, RETURN, SURRENDER, SALE OR OTHER DISPOSITION OF ANY VEHICLE, OR THE
PREACH BY LESSEE OF ANY COVENANT OR CONDITION OF THIS AGREEMENT.  IN THE EVENT
LESSOR SELLS ANY VEHICLE TO LESSEE, TO ANY EMPLOYEE OF LESSEE OR TO ANY
PURCHASER FROM WHOM LESSEE OBTAINS AN OFFER, LESSEE'S COVENANTS OF INDEMNITY
SHALL CONTINUE.  LESSEE FURTHER AGREES TO TAKE UPON ITSELF THE SETTLEMENT OF
ALL SUCH CLAIMS AND THE DEFENSE OF ANY SUIT OR SUITS, OR LEGAL PROCEEDINGS OF
ANY KIND BROUGHT TO ENFORCE SUCH CLAIM OR CLAIMS, AND TO PAY ALL JUDGMENTS
ENTERED IN SUCH SUIT OR SUITS AND ALL COSTS, ATTORNEYS' FEES OR OTHER EXPENSES.
IN ANY INSTANCE WHERE SAID CLAIMS IN ANY WAY AFFECT LESSOR'S INTERESTS UNDER
THIS AGREEMENT, LESSEE SHALL NOT CONSUMMATE ANY SETTLEMENT WITHOUT LESSOR'S
PRIOR WRITTEN CONSENT.

         THE FOREGOING LESSEE'S COVENANTS OF INDEMNITY DO NOT ENCOMPASS ANY
GROSS NEGLIGENCE OR WILLFUL MISCONDUCT BY LESSOR, BUT ARE OTHERWISE ABSOLUTE
AND UNCONDITIONAL AND SHALL CONTINUE IN FULL FORCE AND EFFECT REGARDLESS OF
WHERE, HOW OR BY WHOM ANY VEHICLE IS OPERATED, AND NOTWITHSTANDING ANY
INSURANCE COVERAGE THAT LESSEE MAY CARRY OR THE TERMINATION OR CANCELLATION OF
THIS AGREEMENT.

         THE PROVISIONS OF THIS SECTION COMPREHEND, BUT WITHOUT LIMITATION,
LIABILITY AND CLAIMS, HOWSOEVER ARISING, WHETHER BY REASON OF NEGLIGENCE,
BREACH OF WARRANTY, DEFECT IN MANUFACTURE OR MAINTENANCE OR OTHERWISE, AND EVEN
THOUGH STRICT LIABILITY BE CLAIMED.

         (11)    LESSOR-LESSEE RELATIONSHIP: THE PARTIES INTEND THAT THIS
AGREEMENT BE A TRUE LEASE.  The parties agree that this is not an agreement of
partnership or employment of LESSOR or of any of LESSOR's employees by LESSEE
and that LESSOR is an independent contractor.  Except as may be specifically
provided in an executed Power of Attorney, neither LESSEE nor any employee of
LESSEE shall have any authority to act on behalf of LESSOR or be deemed to be
the agent, servant or employee of LESSOR.  Nothing herein contained shall give
or convey to LESSEE any right, title or interest in and to any Vehicle leased
hereunder except as LESSEE, and LESSEE shall have no option to purchase any
Vehicle.  LESSOR shall have the right at any time to mark the Vehicle stating
its interest as owner and LESSEE will execute such statements as LESSOR may
request confirming LESSOR's ownership.  In the event that, contrary to the
intention of the parties hereto, this Agreement is deemed to be other than a
lease, LESSEE hereby grants LESSOR a security interest in the Vehicles and all
proceeds, accessions, chattel paper, equipment and general intangibles related
thereto to secure all of LESSEE's obligations hereunder.  At LESSOR's request,
LESSEE agrees to execute any financing statements or other instruments
necessary or expedient for filing, recording or perfecting the interest and
title of LESSOR.  A photostatic copy or other reproduction of this Agreement
shall be sufficient as a financing statement.

         (12)    STATEMENTS AND RIGHTS OF INSPECTION:  LESSOR shall have the
right to inspect any Vehicle and the records of LESSEE pertaining to the
Vehicles at any reasonable time upon reasonable notice.  The creditworthiness
of LESSEE and any guarantor is a material condition to this Agreement.  LESSEE
shall provide LESSOR with LESSEE's financial statements and any other
information LESSOR may require from time to time during the term of this
Agreement.

         (13)    DEFAULT:





1991 Gelco Corporation              7 of 11
<PAGE>   8
                 (a)      EVENT OF DEFAULT.  In the event LESSEE shall fail to
make the payments as herein provided or, after ten (10) days' written notice,
shall fail to perform any of its covenants under this Agreement, or in the
event LESSEE or any guarantor shall (i) make an assignment for the benefit of
creditors, or suffer a receiver or trustee to be appointed, or file or suffer
to be filed any petition under any bankruptcy or insolvency law of any
jurisdiction, or (ii) suspend business or commit any act amounting to a
business failure; or (iii) suffer an attachment or tax lien against any of its
property; or (iv) make a voluntary assignment or transfer of any Vehicle or of
any or all of its interest hereunder (in a manner or to a person not permitted
by the terms hereof), or of all or substantially all of its property; or (v)
die (if an individual), or its corporate or partnership existence (as the case
may be) shall cease or terminate; or (vi) commit or omit any act which LESSOR
reasonably determines impairs LESSEE's prospect of making payments or
performing any of the other covenants required by LESSEE hereunder; or (vii) be
in default under any other Agreement it may have with LESSOR or any parent,
subsidiary or affiliate of LESSOR; or (viii) suffer a material adverse change
in operating or financial condition which impairs LESSEE's ability to perform
its obligations hereunder or LESSOR's title or rights to the Vehicles; or (ix)
deliver or make any representation or warranty herein, or in any document
delivered to LESSOR in connection herewith, which shall prove to be false or
misleading in any material respect; or (x) fail to complete an odometer
disclosure form or make a false statement on an odometer disclosure form; then
in such event LESSEE shall be in default under this Agreement, and LESSOR shall
have the rights and remedies hereinafter specified together with all other
remedies available at law or in equity.

                 (b)      REMEDIES.  Upon an event of default, LESSOR may, at
its option:

                          (i)     Cancel this agreement with respect to any or
                 all of the Vehicles hereunder, in which event LESSEE shall
                 immediately deliver, at its sole cost and expense, any and all
                 such Vehicles to a location or locations specified by LESSOR,
                 and collect from LESSEE damages as provided below; or

                          (ii)    Repossess any and all Vehicles hereunder
                 wherever they may be found (and for that purpose LESSOR or its
                 agents may enter upon any premises of or under the control of
                 LESSEE or any other person) without canceling this Agreement
                 and collect damages as provided below.

         LESSOR's rights and remedies are cumulative and not exclusive and the
exercise of one remedy shall not preclude any other remedy.

                 (c)      DAMAGES.  Notwithstanding repossession and sale made
by LESSOR of any Vehicle, LESSOR shall have the right to recover from LESSEE
all damages that LESSOR sustains by reason of LESSEE's default.  Such damages
shall include but not be limited to:

                          (i)     The full amount of Monthly Rentals then due
                 and unpaid, if any;

                          (ii)    Any and all expenses of repossession of the
                 Vehicle(s);

                          (iii)   All other amounts of any nature due under
                 this Agreement including, without limitation, any applicable
                 interest Adjustment Charge and any amount due as a Terminal
                 Rental Adjustment; and

                          (iv)    A sum representing fifteen percent (15%) of
                 the total of the above, in the event that LESSOR is required
                 to refer collection of any balance to its attorney, not a
                 salaried employee of LESSOR.





1991 Gelco Corporation              8 of 11
<PAGE>   9
         Nothing contained in this Agreement shall effect LESSOR's right to
claim against any receiver or trustee or representative of debtor in bankruptcy
or reorganization, or against any of the assets of the LESSEE, for sums due for
any Vehicles used during the period of such bankruptcy or reorganization.

                 (d)      COMPLIANCE.  In case of failure by LESSEE to comply
with any provision of this agreement, LESSOR shall have the right, but not the
obligation, at its option, to effect such compliance as in LESSOR's sole
discretion is appropriate, in whole or in part, and all expenses of LESSOR
incurred in effecting such compliance plus LESSOR's then standard handling fee
shall be immediately due and payable.  LESSOR's effecting such compliance shall
not in any way be deemed to constitute a waiver of any default by LESSEE.

         (14)    FORCE MAJEURE AND NO CONSEQUENTIAL DAMAGES:  LESSOR shall not
be liable for any failure or delay in delivering any Vehicle for any reason, or
for any failure to perform any provisions hereof, resulting from fire or other
casualty, riot, strike, or other labor difficulty, governmental regulation or
restriction or any cause beyond LESSOR's control.  In no event shall LESSOR be
liable for any loss of profits or other consequential damages or any
inconveniences resulting from any theft, damage to, loss of, defect in or
failure of any Vehicle or the time consumed in recovering, repairing,
adjusting, servicing or replacing the same and there shall be no abatement or
apportionment of rental during such time.  LESSEE AGREES THAT LESSEE'S SOLE AND
EXCLUSIVE REMEDY FOR ANY MATTER OR CAUSE OF ACTION RELATED DIRECTLY OR
INDIRECTLY TO ANY BREACH BY LESSOR OF THIS AGREEMENT OR ANY OTHER AGREEMENT
BETWEEN LESSEE AND LESSOR SHALL BE A CAUSE OF ACTION SOUNDING IN CONTRACT AND
WITH DAMAGES LIMITED TO ACTUAL AND DIRECT DAMAGES INCURRED.

         (15)    ASSIGNMENTS:  LESSOR may from time to time assign all or any
part of its right, title and interest in this Agreement, including all moneys
and claims for moneys due and to become due hereunder; provided, however, that
LESSEE may remain in possession of any Vehicle until expiration of its
respective Lease Term as long as LESSEE shall not be in default.

         LESSEE SHALL NOT ASSIGN, SUBLET, LIEN, ENCUMBER OR TRANSFER ANY
INTEREST IN ANY OF THE VEHICLES OR ANY INTEREST IN THIS AGREEMENT TO ANY PARTY
WITHOUT THE WRITTEN CONSENT OF LESSOR.  ANY SUCH CONSENT BY LESSOR SHALL NOT
RELIEVE LESSEE OF ITS OBLIGATIONS AND LIABILITIES HEREUNDER.

         (16)    SUBSIDIARIES, PARENTS AND AFFILIATES:  Any Vehicles leased by
LESSOR to, or operated or used by, present or future subsidiaries, parents or
affiliates of LESSEE shall be within the terms and conditions of this
Agreement, unless covered by a separate lease agreement with such subsidiary,
parent or affiliate, and LESSEE agrees that, in the event such subsidiary,
parent or affiliate does not perform according to the terms and conditions of
the Agreement, LESSEE will, upon fifteen (15) days' notice of any default,
perform according to the tenor of this Agreement regarding the Vehicles on
lease to such subsidiary, parent or affiliate.  Such performance shall be
absolute and unconditional and, with respect to amounts owing, constitute a
guaranty of payment.

         (17)    EXECUTION AND GOVERNING LAW:  THIS AGREEMENT SHALL NOT BECOME
EFFECTIVE UNTIL EXECUTED BY AN AUTHORIZED REPRESENTATIVE OF LESSOR IN EDEN
PRAIRIE, MINNESOTA.  THE LAWS OF THE STATE OF MINNESOTA SHALL GOVERN ALL
QUESTIONS OR DISPUTES, WHETHER SOUNDING IN TORT OR CONTRACT, RELATING TO THE
INTERPRETATION, PERFORMANCE, VALIDITY, ENFORCEMENT, OR EFFECT OF THIS
AGREEMENT, WITHOUT REGARD TO CHOICE OF LAW PRINCIPLES THEREOF.  WITHOUT
LIMITING THE GENERALITY OF THE FOREGOING, ALL VEHICLES LEASED HEREUNDER SHALL
BE SUBJECT TO MINNESOTA STATUTES SECTION 168A.17 SUBD. 1A.





1991 Gelco Corporation             9 of 11
<PAGE>   10
         (18)    SEVERABILITY:  If any portion of this Agreement shall be found
to be illegal, invalid or contrary to public policy, the same may be modified
or stricken by a Court of competent jurisdiction to the extent necessary to
allow the Court to enforce such provision in a manner which is as consistent
with the original intent of the provision as possible.  the striking or
modification by the Court of any provision shall not have the effect of
invalidating the Agreement as a whole.

         (19)    WAIVER OF JURY TRIAL:  BOTH PARTIES TO THIS AGREEMENT HEREBY
WAIVE ANY AND ALL RIGHT TO ANY TRIAL BY JURY IN ANY ACTION OR PROCEEDING
ARISING DIRECTLY OR INDIRECTLY HEREUNDER.

         (20)    MISCELLANEOUS:  This Agreement is for the benefit of and may
be enforced by the respective parties and their successors and permitted
assignees and is not for the benefit of and may not be enforced by any third
party.  This Agreement is the product of negotiations between the parties.
Each provision hereof shall be read and interpreted in accordance with its
common and ordinary meaning and no ambiguity in language shall be read or
interpreted in favor of or against either party.

         (21)    ODOMETER DISCLOSURE STATEMENT:  Federal law (and state law, if
applicable) requires that LESSEE disclose, and LESSEE shall disclose, the
mileage of each Vehicle to LESSOR in connection with the transfer of ownership
of the Vehicle.  Failure to complete an odometer disclosure form or making a
false statement may result in fines and/or imprisonment.

         (22)    LOSS OF OR DAMAGES TO VEHICLES:

                 (a)      RISK OF LOSS.  LESSEE shall bear all risk of los,
damage or destruction to the Vehicle, however caused and included without
limitation, collision, fire, theft, flood, or conversion, abandonment, or
unauthorized sale or concealment by agents or employees of LESSEE, or any other
cause or combination of causes which may occur after the moment of delivery of
the Vehicle to the moment of surrender to or repossession by LESSOR or its
agent.  LESSEE shall advise LESSOR of any loss, destruction or damage to the
Vehicle, within three (3) days from the occurrence thereof.

                 (b)      DAMAGES.  In the event the Vehicle
suffers total loss, destruction or irreparable damage, LESSEE
shall pay to LESSOR the Unamortized Book Value for such Vehicle 
upon receipt of an invoice for the same.  If such total loss, 
destruction or irreparable damage shall occur during the period       Initials 
when LESSEE would be required by the respective Vehicle Order                  
to pay an Early Termination Charge, then LESSEE shall                 /s/ J.S. 
additionally pay the Early Termination Charge.  LESSEE's                       
obligation to pay rental and other expenses shall continue during     -------- 
any period of repairs, and in the case of total loss or irreparable
damage, until LESSOR's receipt of payment thereof.  LESSEE 
understands that such Unamortized Book Value plus Interest 
Adjustment Charge, if any, amy exceed the actual cash value of 
he Vehicle as determined by the insurer of the Vehicle
and that LESSEE shall be required to pay such excess to LESSOR
         
         (23)    MODIFICATIONS:  This Agreement, all Exhibits 
and addenda, and each respective New Vehicle Order and               Initials 
Delivery Receipt contain the entire understanding of the parties              
and merge all oral understandings.  Any modifications, changes,      /s/ J.S. 
or amendments may be made only in writing subscribed by LESSEE                
and LESSOR.  Failure of either party to enforce any right granted    -------- 
herein shall not be deemed a waiver of such right.



1991 Gelco Corporation               10 of 11
<PAGE>   11
IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be signed
by duly authorized representatives.

Effective as of the 2nd of February, 1994.

MCCULLAGH LEASING (LESSOR)            Seitel Geophysical, Inc. (LESSEE)
Address: 30803 Little Mack Avenue     Principal Place of Business and
         Roseville, MI 48066-1787     Mailing Address 50 Briar Hollow Lane West
                                                     --------------------------
                                      
Regional Office Representative:                         Houston, Texas  77027  
                                      -----------------------------------------
                                      
By: /s/ [illegible signature]         By: /s/ Jay N. Silverman
                                      
Title: Regional V.P.                  Title:  President
                                      
Date:  2-22-94                        Date: 2-16-94
                                         
ACCEPTED AT:                             
                                         
Eden Prairie, MN Representative:

By: /s/ [illegible signature]

Date: 2/24/94





1991 Gelco Corporation             11 of 11
<PAGE>   12
EXHIBIT O                                                        Customer #61824
        

This Exhibit amends and modifies that certain Lease Agreement (hereinafter
"Agreement") by and between the undersigned.

1.      For the purposes of this Exhibit, the following definitions shall
        apply:
        
        Contingent Rentals  Costs incurred or assessed by LESSOR to repair or
        recondition Vehicles that are surrendered for sale with excessive wear 
        and tear.

        Guaranteed Residual  Sixteen percent (16%) of the Capitalized Cost for
        Vehicles sold at or prior to twelve (12) months from the date of 
        delivery of the Vehicle to LESSEE, and thirteen percent (13%) of the 
        Unamortized Book Value for Vehicles sold thereafter.

2.      Section 8(e)(ii) of the Agreement is amended in its entirety to read as
        follows:

        If the Net Proceeds are less than the Unamortized Book Value of
        the Vehicle sold, but equal to or greater than the Guaranteed Residual,
        then LESSEE shall pay LESSOR, as a rental charge adjustment, the
        difference between the Net Proceeds and the Unamortized Book Value,
        plus Contingent Rentals, if any. If the Net Proceeds are less than the
        Guaranteed Residual of the Vehicle sold, then LESSEE shall pay LESSOR,
        as a rental charge adjustment, the difference between the Guaranteed
        Residual and the Unamortized Book Value, plus Contingent Rentals, if
        any.

3.      This Amendment is effective as of 2-16-94 for all Vehicles on lease at
        that date and all Vehicles placed in service thereafter. Except as
        amended by this Exhibit, all other terms and conditions of the
        Agreement are ratified and confirmed and remain in full force and
        effect.

McCULLAGH LEASING (LESSOR)              Seitel Geophysical, Inc. (LESSEE)


By:  /s/ [illegible signature]          By:  /s/ Jay N. Silverman

Title:  Regional V.P.                   Title:  President

Date:  2-22-94                          Date:  2-16-94

                                    1 of 1

                                

<PAGE>   1

                                                                  EXHIBIT 10.7.2
GE CAPITAL

Fleet Services                                                Partial Assignment

This is a partial assignment of the Lease Agreement and, if indicated in
Section 2. below, related Service Agreement(s), by and between Gelco
Corporation doing business as GE Capital Fleet Services with its principal
offices at Three Capital Drive, Eden Prairie, Minnesota 55344 ("GECFS") and the
Assignor identified herein to the Assignee identified herein.  The foregoing
Lease Agreement (the "Lease") and, if applicable Service Agreements
("Services"), are collectively referred to herein as the "Agreements".

                                  WITNESSETH:

WHEREAS, a valid Lease dated February 22, 1994 presently exists between GECFS
and Assignor and, if applicable, valid Services, identified on Exhibit B and
Assignor has previously provided Assignee with a copy of each of the Agreements
and Assignee hereby acknowledges receipt of same; and

WHEREAS, the Assignor desires to assign and transfer to the Assignee identified
herein, and the Assignee desires to acquire from the Assignor its interest
under the Lease in certain vehicles (the "Vehicles") described on the Exhibit A
attached hereto; and, if applicable, the related Services.

Assignor Information:

Name: SEITEL GEOPHYSICAL, INC.
Address: 50 Briar Hollow Lane, Houston, TX 77027
State of Incorporation: Delaware

Assignee Information:

Name: EAGLE GEOPHYSICAL, INC.
Address: 50 Briar Hollow Lane, Houston, TX 77027
State of Incorporation: Delaware

WHEREAS, GECFS is willing to consent to such assignment and transfer on the
terms and conditions hereinafter set forth:

NOW, THEREFORE, in consideration of the foregoing recitals and other good and
valuable considerations, the receipt and sufficiency of which are hereby
acknowledged by GECFS, Assignor and Assignee, the parties to this Partial
Assignment, intending to be legally bound, hereby mutually agree as follows:

1.       ASSIGNMENT. As of the Effective Date established herein, Assignor
hereby assigns and transfers to Assignee the Assignor's interest under the
Lease with respect to the Vehicles including its leasehold interest in and to
the Vehicles and its interest in and to the Services; Assignee hereby accepts
and takes the foregoing assignment of the Assignor's interest as Assignee under
the Lease including its leasehold interest in and to the Vehicles and under the
Services; and GECFS consents to the foregoing assignment in each and every case
on and subject to the terms and conditions herein set forth.

2.       SERVICES. Services with respect to the Vehicles which are included in
this Assignment are as provided in the following documents: None





1
<PAGE>   2
3.       SPECIFIC TERMS AND CONDITIONS MODIFYING AGREEMENTS. Nothing to the
contrary in the Agreements notwithstanding, the following provisions shall
apply to Assignee as conditions of GECFS' consent to this Partial Assignment:

A.       Insurance. As of the Effective Date of this Assignment and continuing
for the Lease Term of each Vehicle, Assignee shall maintain the following
coverages with an insurance company acceptable to GECFS and deliver to GECFS a
certificate thereof:

a.       Automobile liability insurance naming GECFS as an Additional Insured
with limits of coverage as GECFS may require, but in no event less than $1
million combined single limit per occurrence ($5 million for Vehicles capable
of transporting 9 or more passengers). No self-insured retention or deductible
is permissible.

b.       Comprehensive and collision insurance naming GECFS as Loss Payee with
coverage for the actual cash value of each Vehicle and subject to a deductible
no greater than $500.  Assignee shall bear all risk of loss, damage or
destruction to the Vehicle (which may exceed actual cash value), however
caused, from the time of acceptance until surrender to GECFS.

c.       Conditions.  All insurance policies shall provide for 30 days' prior
written notice to GECFS of any cancellation or reduction in coverage.  Assignee
authorizes GECFS to endorse Assignee's name to insurance checks related to the
Vehicles.

B.       365-Day Interest Basis.  As of the Effective Date, the interest
component of all rental charges shall be calculated on a 365 day basis.

C.       Further Assignment.  ASSIGNEE SHALL NOT ASSIGN, SUBLET, LIEN,
ENCUMBER, OR TRANSFER ANY INTEREST IN ANY OF THE VEHICLES OR ANY INTEREST IN
THIS AGREEMENT TO ANY PARTY WITHOUT THE WRITTEN CONSENT OF GECFS.  ANY SUCH
CONSENT AS GECFS SHALL NOT RELIEVE ASSIGNEE OF ITS OBLIGATIONS AND LIABILITIES
HEREUNDER UNLESS ASSIGNEE IS RELEASED BY GECFS.

D.       Maximum Lease Term.  The lease term of any Vehicle shall not exceed 50
months for automobiles, 72 months for light trucks and 96 months for medium and
heavy trucks.  If a Vehicle reaches its Maximum Lease Term, Assignee agrees
that it has no right to continued possession of such Vehicle and that it will
surrender such Vehicle to GECFS for sale.  If a Vehicle is or becomes fully
amortized, but has not reached its Maximum Lease Term, Assignee agrees to pay
GECFS an extended administration fee of $50.00 per month.

E.       Execution and Governing Law:  THIS ASSIGNMENT SHALL NOT BECOME
EFFECTivE UNTIL EXECUTED BY GECFS IN EDEN PRAIRIE, MINNESOTA. THE LAWS OF THE
STATE OF MINNESOTA SHALL GOVERN ALL QUESTIONS OR DISPUTES, WHETHER SOUNDING IN
TORT OR CONTRACT, RELATING TO THE INTERPRETATION, PERFORMANCE, VALIDITY,
ENFORCEMENT, OR EFFECT OF THIS AGREEMENT, WITHOUT REGARD TO CHOICE OF LAW
PRINCIPLES THEREOF.  WITHOUT LIMITING THE GENERALITY OF THE FOREGOING, ALL
LEASES OF VEHICLES HEREUNDER SHALL BE SUBJECT TO MINNESOTA STATUTES SECTION
168A.17 SUBD.1A.

F.       Odometer Disclosure Statement:  At the time of surrender of a Vehicle
to GECFS for sale, Federal law (and State law, if applicable) requires that
Assignee disclose, and Assignee shall disclose, the mileage of each Vehicle to
GECFS in connection with the transfer of ownership of the Vehicle.  Failure to
complete an odometer disclosure form or making a false statement may result in
fines and/or imprisonment.

G.       Hazardous Substances: In no event will the Vehicles be used to
transport any hazardous substances.





2
<PAGE>   3
4.       ASSUMPTION OF LEASE AND SERVICES.  The Assignee acknowledges that the
Assignee has read the Lease and Services and all Exhibits and Schedules
attached thereto and hereby assumes as of the Effective Date all of the
obligations, liabilities and duties of Assignor under the Lease and Services
directly or indirectly related to the Vehicles, as though the Assignee had
originally entered into the Agreements including, without limitation, the
covenants of indemnification and GECFS' disclaimer of any warranties provided
that Assignee hereby assumes the obligations of rental payments and other
payments or reimbursements with respect to the Vehicles and Services as of the
Billing Effective Date.

5.       ASSIGNOR GUARANTY.  The Assignor herein agrees that Assignor will
remain fully bound to the observance and performance of each and every term and
condition imposed upon it under the Agreements for the full remainder of the
term of each Vehicle, notwithstanding this Partial Assignment, and that in
event the Assignee fails to perform its obligations, the Assignor agrees to do
so.  Such performance shall be absolute and unconditional and, with respect to
amounts owing, constitute a guaranty of payment.

6.       BILLING EFFECTIVE DATE.  For purposes of monthly rental billing and
other monetary obligations, this Assignment is effective as of the 1st day of
or such subsequent date as the parties mutually agree. (Must be the 1st day of
the month.)

7.       EFFECTIVE DATE.  For purposes of all obligations, liabilities and
duties, other than monthly rental billing and other monetary obligations, the
Effective Date of this Partial Assignment shall be the later of the date upon
which this Partial Assignment is accepted by an authorized representative of
GECFS in Eden Prairie, Minnesota or the date upon which the parties agree that
possession of the Vehicles will be transferred to Assignee.  Date of agreed
transfer of possession: December 31, 1996.

8.       COSTS AND EXPENSES.  Assignor agrees to reimburse GECFS for any out of
pocket expenses related to this assignment and to pay a setup and documentation
fee for this assignment of $330.

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be signed
by duly authorized representatives

SEITEL GEOPHYSICAL, INC.                      EAGLE GEOPHYSICAL, INC.
Assignor                                      Assignee
                                      
By  /s/ Jay N. Silverman                      By  /s/ Jay N. Silverman
                                      
Title  Jay N. Silverman, President            Title  Jay N. Silverman, President

GE Capital Fleet Services

By:  /s/ Melinda L. Ackerman

Title: Authorized Signatory

Effective Date:  4-8-97

No Assignment will be accepted until GECFS receives a Certificate of Insurance
from Assignee providing required coverage.  Certificate should accompany
document or be faxed to (800) 668-8879

                                   EXHIBIT A
                               PARTIAL ASSIGNMENT

SEE ATTACHED VEHICLE LISTING 2





3
<PAGE>   4
GE CAPITAL
Fleet Services

                      Assignee Business Use Certification
                    (Pursuant to the Internal Revenue Code)

1.       Assignee certifies under penalty of perjury that it intends the
         Vehicles leased pursuant to this Agreement to be used more than 50% in
         the trade or business of Assignee; and

2.       Assignee has been advised that GECFS and not Assignee will be treated
         as the owner of the Vehicles for Federal Income Tax purposes.

                          EAGLE GEOPHYSICAL, INC.


                          By:  /s/ Jay N. Silverman

                          Title:  Jay N. Silverman, President





4
<PAGE>   5
                                   EXHIBIT A

<TABLE>
- --------------------------------------------------------------------------------------------------------------------------------
 <S>               <C>                <C>                          <C>              <C>        <C>
 Fleet 61824       Level 2              1 Vin 1FDNF77HXCVA23202    Inservice Date   2/28/94    Name and Address
 Unit #94601106    Level 3              1000 Cont./Sub L2  1400    Lic. No.         0593VU       UNASSIGNED
                   Level 4              Year   1982                Lic. St.         TX         SEITEL GEOPHYSICAL INC.
                   Level 5              Make   FORDX               Lic. Renew       03/31/96   50 BRIAR HOLLOW LAND
                   Level 6              Model  F700                Date                        HOUSTON TX 77027
                   Client Reference No.                            MIS/Term         26 / 36
                                                                   Client Unit No.
- --------------------------------------------------------------------------------------------------------------------------------
 Fleet 61824       Level 2              1 Vin 1NNEF4223BM053637    Inservice Date   2/28/94    Name and Address
 Unit #94601118    Level 3              1000 Cont./Sub L2  1400    Lic. No.         Y38092       UNASSIGNED
                   Level 4              Year   1981                Lic. St.         TX         SEITEL GEOPHYSICAL INC.
                   Level 5              Make   TRLRX               Lic. Renew       03/31/96   50 BRIAR HOLLOW LAND
                   Level 6              Model  TRAILER             Date                        HOUSTON TX 77027
                   Client Reference No.                            MIS/Term         26 / 24
                                                                   Client Unit No.
- --------------------------------------------------------------------------------------------------------------------------------
 Fleet 61824       Level 2              1 Vin 1FBJS31H5THA31629    Inservice Date   3/18/96    Name and Address
 Unit #96000359    Level 3              1000 Cont./Sub L2  0001    Lic. No.                      UNASSIGNED
                   Level 4              Year   1996                Lic. St.         LA         SEITEL GEOPHYSICAL, INC.
                   Level 5              Make   FORDX               Lic. Renew                  107 CORNER ROAD
                   Level 6              Model  E350 CLUBWAG        Date             0 / 60     BROUSSARD LA 70518
                   Client Reference No.                            MIS/Term
                                                                   Client Unit No.
- --------------------------------------------------------------------------------------------------------------------------------
 Fleet 61824       Level 2              1 Vin 1FTEX15B5RKA92137    Inservice Date   2/26/94    Name and Address
 Unit #94601116    Level 3              1000 Cont./Sub L2  0001    Lic. No.         S394896      UNASSIGNED
                   Level 4              Year   1994                Lic. St.         LA         SEITEL GEOPHYSICAL INC.
                   Level 5              Make   FORDX               Lic. Renew       01/31/98   50 BRIAR HOLLOW LAND
                   Level 6              Model  F150 SUPER C        Date                        HOUSTON TX 77027
                   Client Reference No.                            MIS/Term         26 / 36
                                                                   Client Unit No.
- --------------------------------------------------------------------------------------------------------------------------------
 Fleet 61824       Level 2              1 Vin 1FDKF38M5RNB17388    Inservice Date   5/2/94     Name and Address
 Unit #94SG1107    Level 3              1000 Cont./Sub L2  0001    Lic. No.         FL4340       UNASSIGNED
                   Level 4              Year   1994                Lic. St.         TX         SEITEL GEOPHYSICAL INC.
                   Level 5              Make   FORDX               Lic. Renew       05/31/96   50 BRIAR HOLLOW LAND
                   Level 6              Model  F350 REGULAR        Date                        HOUSTON TX 77027
                   Client Reference No.                            MIS/Term         24 / 36
                                                                   Client Unit No.
- --------------------------------------------------------------------------------------------------------------------------------
 Fleet 61824       Level 2              1 Vin 1FDKF38M1RNB17386    Inservice Date   5/2/94     Name and Address
 Unit #94SG1108    Level 3              1000 Cont./Sub L2  0001    Lic. No.         FL4341       UNASSIGNED
                   Level 4              Year   1994                Lic. St.         TX         SEITEL GEOPHYSICAL INC.
                   Level 5              Make   FORDX               Lic. Renew       05/31/96   50 BRIAR HOLLOW LAND
                   Level 6              Model  F350 REGULAR        Date                        HOUSTON TX 77027
                   Client Reference No.                            MIS/Term         24 / 36
                                                                   Client Unit No.
- --------------------------------------------------------------------------------------------------------------------------------
 Fleet 61824       Level 2              1 Vin 1FDKF38M3RNB17387    Inservice Date   5/4/94     Name and Address
 Unit #94SG1109    Level 3              1000 Cont./Sub L2  0001    Lic. No.         HX7900       UNASSIGNED
                   Level 4              Year   1994                Lic. St.         TX         SEITEL GEOPHYSICAL INC.
                   Level 5              Make   FORDX               Lic. Renew       06/30/96   50 BRIAR HOLLOW LAND
                   Level 6              Model  F350 REGULAR        Date                        HOUSTON TX 77027
                   Client Reference No.                            MIS/Term         24 / 36
                                                                   Client Unit No.
- --------------------------------------------------------------------------------------------------------------------------------
 Fleet 61824       Level 2              1 Vin 1FTHX26H9RKB39195    Inservice Date   5/10/94    Name and Address
 Unit #94SG1110    Level 3              1000 Cont./Sub L2  0001    Lic. No.         JJ9206       UNASSIGNED
                   Level 4              Year   1994                Lic. St.         TX         SEITEL GEOPHYSICAL INC.
                   Level 5              Make   FORDX               Lic. Renew       04/30/96   50 BRIAR HOLLOW LAND
                   Level 6              Model  F250 SUPER C        Date                        HOUSTON TX 77027
                   Client Reference No.                            MIS/Term         24 / 36
                                                                   Client Unit No.
- --------------------------------------------------------------------------------------------------------------------------------
</TABLE>




5
<PAGE>   6


<TABLE>
- --------------------------------------------------------------------------------------------------------------------------------
 <S>               <C>                      <C>                          <C>              <C>        <C>                       
 Fleet 61824       Level 2                  1 Vin 1FTHF26H8RLA77219    Inservice Date   3/11/94    Name and Address            
 Unit #94SG1111    Level 3                  1000 Cont./Sub L2  0001    Lic. No.         HD5552       UNASSIGNED                
                   Level 4                  Year   1994                Lic. St.         TX         SEITEL GEOPHYSICAL INC.     
                   Level 5                  Make   FORDX               Lic. Renew       03/31/96   50 BRIAR HOLLOW LAND        
                   Level 6                  Model  F250 REGULAR        Date                        HOUSTON TX 77027            
                   Client Reference No.                                MIS/Term         26 / 36                                
                                                                       Client Unit No.                                         
- --------------------------------------------------------------------------------------------------------------------------------
 Fleet 61824       Level 2                  1 Vin 1FTHF26H4RLA77220    Inservice Date   3/31/94    Name and Address            
 Unit #94SG1112    Level 3                  1000 Cont./Sub L2  0001    Lic. No.         HD5550       UNASSIGNED                
                   Level 4                  Year   1994                Lic. St.         TX         SEITEL GEOPHYSICAL INC.     
                   Level 5                  Make   FORDX               Lic. Renew       03/31/96   50 BRIAR HOLLOW LAND        
                   Level 6                  Model  F250 REGULAR        Date                        HOUSTON TX 77027            
                   Client Reference No.                                MIS/Term         25 / 36                                
                                                                       Client Unit No.                                         
- ----------------------------------------    ------------------------------------------------------------------------------------
 Fleet 61824       Level 2                  1 Vin 1FTEX                Inservice Date   5/2/94     Name and Address            
 Unit #94SG1113    Level 3                  14N3RKB28389               Lic. No.         JY9576       UNASSIGNED                
                   Level 4                  1000 Cont./Sub L2  0001    Lic. St.         TX         SEITEL GEOPHYSICAL INC.     
                   Level 5                  Year   1994                Lic. Renew       04/30/96   50 BRIAR HOLLOW LAND        
                   Level 6                  Make   FORDX               Date                        HOUSTON TX 77027            
                   Client Reference No.     Model  F150 SUPER C        MIS/Term         24 / 36                                
                                                                       Client Unit No.                                         
- ----------------------------------------    ------------------------------------------------------------------------------------
 Fleet 61824       Level 2                  1 Vin 1FTEX14NXRKB28390    Inservice Date   5/2/94     Name and Address            
 Unit #94SG1114    Level 3                  1000 Cont./Sub L2  0001    Lic. No.         JY8941       UNASSIGNED                
                   Level 4                  Year   1994                Lic. St.         TX         SEITEL GEOPHYSICAL INC.     
                   Level 5                  Make   FORDX               Lic. Renew       04/30/96   50 BRIAR HOLLOW LAND        
                   Level 6                  Model  F150 SUPER C        Date                        HOUSTON TX 77027            
                   Client Reference No.                                MIS/Term         24 / 36                                
                                                                       Client Unit No.                                         
- ----------------------------------------    ------------------------------------------------------------------------------------
 Fleet 61824       Level 2                  1 Vin 1FTJW36M6REA30022    Inservice Date   5/17/94    Name and Address            
 Unit #94SG1115    Level 3                  1000 Cont./Sub L2  0001    Lic. No.         FL4019       UNASSIGNED                
                   Level 4                  Year   1994                Lic. St.         TX         SEITEL GEOPHYSICAL INC.     
                   Level 5                  Make   FORDX               Lic. Renew       04/30/96   50 BRIAR HOLLOW LAND        
                   Level 6                  Model  F350 CREW CA        Date                        HOUSTON TX 77027            
                   Client Reference No.                                MIS/Term         23 / 36                                
                                                                       Client Unit No.                                         
- --------------------------------------------------------------------------------------------------------------------------------
</TABLE>




6

<PAGE>   1


                                                                          10.8.1




                       TERM CREDIT AND SECURITY AGREEMENT

         This Term Credit and Security Agreement (the "Agreement") is executed
and delivered this 15th day of July, 1993 by and between SEITEL GEOPHYSICAL,
INC., a Delaware corporation ("Borrower"), with its chief executive office and
its principal place of business at 50 Briar Hollow Lane, 7th  Floor-West,
Houston, Texas 77027 and CENTRAL BANK OF THE SOUTH, an  Alabama  banking
corporation  ("Bank"), with its principal offices at 15 South 20th Street,
Birmingham, Alabama 35233.  Borrower has applied  to Bank for a term loan in
the principal amount of FOUR MILLION THREE HUNDRED THOUSAND AND NO/100 Dollars
($4,300,000) to be evidenced by a Term Note (the "Note") in such amount, and to
be secured by a security interest in all of the Collateral (as defined herein)
on the terms hereinafter set forth.

Bank is willing to extend such $4,300,000 term loan (the "Term Loan") to
Borrower to provide Borrower with financing for the purchase of an Opseis Eagle
seismic data gathering and recording system upon the security of the Collateral
on the terms and subject to the conditions hereinafter set forth.

         Accordingly, Borrower and Bank in consideration of the premises, the
credit to be extended hereunder, and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, agree as follows:

         SECTION 1.  DEFINITIONS - AS HEREIN USED.

                 1.1      "Account" and "Account Receivable" shall include all
         accounts, accounts receivable, notes, notes receivable, contracts,
         contract rights, leases, lease payments, rental agreements, rentals,
         drafts, documents, title retention and lien instruments, security
         agreements, acceptances, instruments, conditional sales contracts,
         chattel mortgages, chattel paper, general intangibles, and other forms
         of obligation and rights to payment and receivables whether or not yet
         earned by performance (including, without limitation, state and
         federal tax refunds).

                 1.2      "Account Debtor" shall mean the party other than
         Borrower who is obligated on  or under any Account Receivable or
         contract right.

                 1.3    "Borrower's Loan Account" shall mean the account on the
         books of Bank in which Bank will record the Term Loan advance made by
         Bank to or on behalf of Borrower pursuant to this Agreement, payments
         received on such Term Loan and other appropriate debits and credits as
         provided by this Agreement or the Note.

                 1.4      "Collateral" shall mean any and all property in which
         Bank acquired, now has, by this Agreement or any of the other Loan
         Documents (as  defined  herein) acquires, or hereafter acquires a
         security interest or other rights or interests as security for the
         Liabilities (as defined herein).

                 1.5      "Insolvency" of Borrower or any other person or
         entity shall mean that there shall have occurred with respect to
         Borrower or such other person or entity one or more of the following
         events: death, incapacity, dissolution, termination of existence,
         liquidation, insolvency, business failure, appointment of a receiver
         of any part of title property of, assignment for the benefit of
         creditors by Borrower or such other person or entity, or institution
         of any action or proceeding by Borrower or such





Term Credit and Security Agreement                                        Page 1
<PAGE>   2
         other person or entity under or pursuant to any insolvency laws
         relating to the relief of debtors by Borrower or such other person or
         entity, institution of proceedings in bankruptcy or with respect to
         the readjustment of indebtedness, reorganization, composition or
         extension by Borrower or such other person or entity (including,
         without limitation, under or pursuant to the United States Bankruptcy
         Code, as amended, or under any similar law at any time enacted (the
         "Bankruptcy Code")), or if any corporate action shall be taken for the
         purpose of effecting any of the foregoing.

                 1.6      "Inventory" shall mean all of Borrower's (or other
         entities', as applicable) inventory (as defined in the Uniform
         Commercial Code as enacted in the State of Alabama, or in any other
         jurisdiction), including, without limitation, all goods, merchandise
         and other personal property now owned or hereafter acquired by
         Borrower (or other entities, as applicable) which are held for sale,
         lease, rental or licensing or are furnished or to be furnished under a
         contract of service and all raw materials, work in process, and
         materials or supplies used or to be used, or consumed or to be
         consumed, in Borrower's (or other entities', as applicable) business,
         and related products, wherever located, and all goods represented
         thereby, and all such goods that may be reclaimed or repossessed from
         or returned by Borrower's (or other  entities', as  applicable)
         customers wheresoever the same may be located, and all shipping and
         packaging materials relating to any of the foregoing.

                 1.7      "Liabilities" shall mean any and all obligations,
         indebtedness and liabilities of (i) Borrower and (ii) Seitel, Inc.
         ("Related Borrower") to Bank of every kind and description, whether
         direct or indirect, absolute or contingent, joint or several, due or
         to become due, liquidated or unliquidated, now existing or hereafter
         arising, and all extensions, modifications, renewals, and refinancings
         thereof, regardless of how such Liabilities arise or by what agreement
         or instrument (if any) they may be evidenced and include obligations
         to perform acts and refrain from taking actions as well as obligations
         to pay money. Without limiting the foregoing, Liabilities shall
         specifically include all liabilities and obligations of (i) Borrower
         arising under or in connection with (a) this Agreement and (b) the
         Note and (ii) Related Borrower arising under or in connection with (a)
         that certain Revolving Credit and Security Agreement executed by
         Related Borrower in favor of Bank on or about the date hereof (the
         "Related Loan Agreement") in connection with Related Borrower's
         $10,000,000 revolving line of credit from Bank (the "Revolving Line"),
         (b) that certain $10,000,000 Master Revolving Promissory Note executed
         by Related Borrower in connection with the Revolving Line (the
         "Revolving Note"), and the other documents and instruments executed in
         connection with the Revolving Line (jointly and severally with the
         Related Loan Agreement and the Revolving, Note as the same may be
         amended, referred to as the "Related Loan Documents") and (c) the
         Continuing Unlimited Guaranty (the "Guaranty") executed by Related
         Borrower in connection with the Term Loan.

                 1.8      "Loan  Documents" shall mean and include the Note,
         this Agreement, the Guaranty, the  Related Loan  Documents, the Side
         Letter Agreement executed by Bank, Borrower and Related Borrower dated
         July 15, 1993, and any other agreement, document or instrument now or
         hereafter evidencing, securing, guaranteeing or relating to the Term
         Loan or any other Liability, obligation or indebtedness of Borrower or
         Related Borrower to Bank, as the same may be amended.

                 1.9      "Net Worth" and "Current Maturities of Long Term
         Debt" shall be defined and calculated in accordance with generally
         accepted accounting principles consistently applied.

                 1.10     "Proceeds" shall mean all cash proceeds, non-cash
         proceeds and all forms of payment and other property received by or
         due to Borrower, et al. from the collection, sale, lease, rental,
         transfer,  exchange, disposition, licensing or use of Accounts and
         other property constituting Collateral hereunder and any and all
         claims against any third party for loss of or damage to any
         Collateral, including insurance, contract and tort claims, and
         further, without limiting the generality of the foregoing, Proceeds
         shall  include all Accounts, checks, cash, money orders, drafts,
         chattel paper, general intangibles, instruments,





Term Credit and Security Agreement                                        Page 2
<PAGE>   3
         notes and other documents evidencing payment and payment obligations
         for the sale, lease, rental, transfer, exchange, use, disposition,
         licensing, or collection of Collateral.

                 1.11     "Tangible Net Worth" shall mean Related Borrower's
         Net Worth less (i) any and all loans and other advances to Related
         Borrower's affiliates, subsidiaries, owners, parent, employees,
         officers, shareholders, directors or other related entities; (ii)
         notes, notes receivable, accounts, accounts receivable, intercompany
         receivables, and other amounts owing from Related Borrower's
         affiliates, subsidiaries, owners, parent, employees, officers,
         shareholders, directors or other related entities; (iii) any and all
         intangibles; plus Related Borrower's existing 12-1/2% subordinated
         debentures due in 1999 and Related Borrower's existing 9% convertible
         subordinated debentures due in 2002 ("Related Borrower's Subordinated
         Debentures").

                 1.12     "Total Debt" shall mean all of Related Borrowers'
         indebtedness and liabilities owing to Bank or any other person or
         entity, whether now or hereafter existing, created or arising,
         absolute or contingent, direct or indirect, joint or several,
         including without limitation, the Liabilities.

                 1.13     "Permitted Encumbrances" shall mean any of the
         following (but only to the extent the same do not or could not, in
         Bank's reasonable opinion, jeopardize Bank's rights or priority in or
         to any  Collateral):

                 (a)      liens of vendors, carriers, warehousemen, landlords,
                          mechanics, laborers and materialmen arising by law
                          for sums which are not yet due or which are being
                          diligently contested in good faith;

                 (b)      liens for taxes not yet due or which are being
                          diligently contested in good faith by appropriate
                          proceedings;

                 (c)      security interests in the Related Borrower's
                          equipment (other than equipment constituting Seismic
                          Data, if any) provided that they are limited to those
                          securing a portion of the purchase price of said
                          equipment;

                 (d)      pledges or deposits in connection with or to secure
                          worker's compensation or unemployment insurance;

                 (e)      Geo Seismic Services, Inc.'s security interest in the
                          Assets (as that term is defined in the letter from
                          Related Borrower to Bank dated October 14, 1992 (the
                          "Letter")) purchased from Geo Seismic Services, Inc.
                          but only to the extent described in and permitted by
                          the Letter; and

                 (f)      security interests in Borrower's equipment (other
                          than the equipment described or referenced in Exhibit
                          B hereto).

                 1.14     Any terms used to describe Bank's security interest
         hereunder not specifically defined herein shall have the meanings and
         definitions given those terms under the Uniform Commercial Code of
         Alabama as in effect on the date hereof.  Any capitalized terms used
         but not defined in this Agreement shall have the meaning given the
         same in the Related Loan Agreement.

         SECTION 2. BORROWER'S REPRESENTATIONS AND WARRANTIES; CERTAIN
COVENANTS.

         To induce Bank to enter into this Agreement, Borrower represents,
warrants and covenants as follows:





Term Credit and Security Agreement                                        Page 3
<PAGE>   4
                 2.1      Borrower (a) is a duly organized Delaware
         corporation, validly existing, and in good standing under the laws of
         the States of Delaware, Texas and Louisiana; (b) has all necessary
         licenses and corporate power and authority to own its assets and
         conduct its business as now conducted or presently proposed to be
         conducted; (c) has no subsidiaries (except as set forth on Schedule
         2.1 hereto; and (d) is duly qualified and in good standing (and will
         remain so qualified and in good standing) in every jurisdiction in
         which it is or shall be doing business or in which the failure so to
         qualify and remain in good standing would or could have a material
         adverse effect on its business or properties or the Collateral.

                 2.2      The execution, delivery, and performance hereof are
         within Borrower's corporate powers, have been duly and validly
         authorized and are not in contravention of the law or the terms of
         Borrower's charter, by-laws, or other incorporation papers, or of any
         indenture, agreement, or undertaking or any law, regulation or order
         to which Borrower is a party or by which it or any of its properties
         is or may be bound.  Upon execution and delivery hereof, this
         Agreement will be a valid and binding obligation of Borrower
         enforceable in accordance with its terms.

                 2.3      Except for the security interests granted to Bank
         hereby or by any of the other Loan Documents in favor of Bank, either
         Related Borrower or Borrower is and, as to the Accounts Receivable and
         other Collateral arising or to be acquired after the date hereof,
         shall be the sole and exclusive owner of the Accounts and all other
         Collateral free from any lien, claim, charge, security interest,
         mortgage, secondary financing or encumbrance or other interests except
         for (i) Permitted Encumbrances; (ii) Approved Seismic Data Licenses
         (defined  below); and (iii) those approved in advance in writing by
         Bank, and Borrower shall defend the Accounts and all other Collateral
         and all Proceeds and products thereof against all claims and demands
         of all persons at any time claiming the same or any interest therein
         adverse to the interests of Bank.

                 2.4      Borrower will promptly pay, all taxes or charges
         levied on or with respect to, and will at all times keep the Accounts
         and all other Collateral, free and clear of all liens, claims,
         charges, security interests, mortgages, secondary financing and
         encumbrances and other interests whatsoever, other than (i) Approved
         Seismic Data Licenses; (ii) the security interests granted to Bank
         hereby or by any of the other Loan Documents, (iii) Permitted
         Encumbrances; and (iv) those approved in advance in writing by Bank.
         Borrower agrees to take all actions that Bank may request to establish
         and maintain a valid title and security interest in the Accounts and
         all other Collateral, free and clear of  all  other  liens,  claims,
         charges,  security interests, mortgages, secondary financing and
         encumbrances whatsoever, including, without  limitation, the payment
         of any amounts, taxes, assessments, fees and/or charges necessary to
         perfect Bank's security interest in the same. If such amounts, taxes
         or assessments, fees and/or charges remain unpaid after the date fixed
         for the payment of same, or if any lien, claim, charge, security
         interest,  mortgage,  secondary financing or encumbrance shall arise,
         or be claimed or asserted with respect to the Accounts  or any other
         Collateral, Bank may, without notice to Borrower, pay such taxes,
         assessments, charges or  claims, or take any and all other actions
         (including the payment of money) deemed desirable by Bank to remove
         any such lien, claim, charge, security interest, mortgage, secondary
         financing or encumbrance, and Borrower agrees that the amounts
         thereof, along with any amounts necessary to perfect and note Bank's
         interest in any Collateral, may be charged to Borrower's Loan Account
         described herein and shall bear interest at the rate of interest borne
         by Borrower's obligations under the Note.

                 2.5      Neither Borrower nor Related Borrower will (nor will
         allow or suffer any other person or entity to) (except-for the
         non-exclusive licensing of Related Borrower's Seismic Data pursuant to
         Participation Agreements and Licensing Agreements entered into in the
         normal and ordinary course of business ("Approved Seismic Data
         Licenses')), sell, transfer, lease, convey or otherwise dispose of the
         Collateral, any portion thereof, or any interest therein (or any of
         the Proceeds thereof, including, without limitation, money, checks,
         money orders, drafts, notes, instruments, documents, chattel paper,
         Accounts, returns or repossessions), without Bank's prior written
         consent.





Term Credit and Security Agreement                                        Page 4
<PAGE>   5
                 2.6      Borrower will deliver to Bank, so long as any of the
         Liabilities shall remain outstanding, such documents, instruments,
         data or information of any type requested by Bank with respect to the
         Accounts Receivable and any other Collateral.

                 2.7      At the time Borrower pledges, sells, assigns or
         transfers to Bank any instruments, document of title, security,
         chattel paper or other property, or any interest therein, Borrower
         shall be the lawful owner thereof and shall have good right to pledge,
         sell, assign or transfer the same; none of such property shall have
         been pledged, sold, assigned or transferred  to  any  person  other
         than Bank or in any way encumbered (except as otherwise allowed under
         the terms of this Agreement), and Borrower shall defend the same
         against the lawful claims and demands of all persons other than Bank.

                 2.8      Borrower shall give Bank written notice of each
         location at which tangible Collateral is or will be kept, whether for
         temporary processing, storage, like purposes or otherwise.  Except as
         such notice is given, all tangible Collateral is and shall be kept at
         (a) Borrower's places of business listed on Schedule 2.9 hereto or (b)
         Related Borrower's places of business noted in Section 2.9 of the
         Related Loan Agreement.

                 2.9      Borrower shall give Bank written notice of each
         office of Borrower at which records of Borrower pertaining to
         Borrower's Accounts Receivable, general intangibles and contract
         rights are kept.  Except as such notice is given, all records of
         Borrower pertaining to Borrower's Accounts Receivable, general
         intangibles and contract rights are and shall be kept at Borrower's
         chief executive office as noted  on the first page of this Agreement
         (which Borrower represents and warrants is Borrower's chief executive
         office).

                 2.10     Subject to any limitations stated therein or in
         connection therewith, all balance sheets, earnings statements and
         other financial data which have been or may hereafter be furnished to
         Bank to induce it to enter into this Agreement, or otherwise furnished
         in connection herewith, do or shall fairly represent the financial
         condition of Borrower or Related Borrower (or other person or entity,
         as applicable) as of the dates and results of operations for the
         periods for which the same are furnished in accordance with generally
         accepted accounting principles consistently applied, and all other
         information, reports and other papers and data furnished to Bank shall
         be accurate, as of the relevant date, and correct in all  material
         respects and complete insofar as completeness may be necessary to give
         Bank a true and accurate knowledge of the subject matter.

                 2.11     With respect to any and all equipment which may now
         or hereafter constitute Collateral hereunder, Borrower or Related
         Borrower shall maintain possession of same, keep the same in good
         repair, and maintain casualty insurance on the same naming Bank as
         loss payee under a New York (long form) standard mortgagee
         endorsement.

                 2.12     Borrower's name, chief executive office and principal
         place of business are and always have been as set forth on the first
         page of this Agreement, except as otherwise disclosed in writing to
         Bank.  Borrower will promptly advise Bank in writing of any charge in
         Borrower's name, chief executive office or principal place of
         business.

                 2.13     Borrower is not now in default under any agreement
         evidencing an obligation for the payment of money, performance,
         delivery, or licensing, demand under which, or acceleration of the
         maturity of which would render Borrower insolvent or  unable to meet
         its other debts as they become due or conduct its business as usual.

                 2.14     In the event (a) any of Borrower's warranties or
         representations shall prove to have been false or misleading when
         made; or (b) an Account Debtor in judicial proceeding, shall assert
         against the





Term Credit and Security Agreement                                        Page 5
<PAGE>   6
         Bank a claim or defense arising out of any transaction between such
         Account Debtor and Borrower,  Borrower agrees to indemnify and hold
         Bank harmless from and against any liability, judgment, cost,
         attorneys' fees or other expense whatsoever arising therefrom.

                 2.15     Borrower will pay any and all taxes, with the
         exception of taxes measured by income, charges and expenses of every
         kind or description paid or incurred by Bank under or with respect to
         the Term Loan or any Collateral therefor or the collection of or
         realization upon the same.  Borrower hereby authorizes Bank to debit
         such and other charges, taxes and expenses provided for in this
         Agreement  (including, without limitation, those taxes, charges and
         expenses for which Borrower is liable under Section 13) to Borrower's
         Loan Account.

                 2.16     None of the Collateral is patented, copyrighted or
         trademarked or subject to any existing copyright, patent or trademark.
         Prior to the time any Collateral is copyrighted, licensed, patented or
         trademarked by Borrower or subjected to any copyright, license, patent
         or trademark by Borrower, Borrower shall notify Bank and shall take
         (or cause to be taken) all actions necessary to preserve the
         perfection and priority of Bank's security interest in such
         Collateral.

                 2.17     Borrower shall notify Bank of any filing under the
         Bankruptcy Code by, for or against Borrower within two (2) business
         days of its having knowledge of such filing.

                 2.18     There are no judgments, actions, suits, claims,
         proceedings or investigations existing, outstanding, pending, or to
         the best of Borrower's knowledge after due inquiry, threatened or  in
         prospect, before any court, agency or tribunal, or governmental
         authority against or involving Borrower which do or could reasonably
         be expected to materially affect the business, properties, prospects,
         financial condition, earnings, results of operations or earnings
         capacity of Borrower or which question the validity of the Term Loan
         or any of the Loan Documents or any action or instrument contemplated
         by any of them.

         Nothing in this Section 2 shall be deemed to extend the maturity date
         of the Term Loan beyond the time noted in Section 14 hereof.

         SECTION 3. BANK'S AGREEMENT TO MAKE ADVANCE.

                 3.1      The $4,300,000 Term Loan advance shall be made
         contemporaneously herewith in a manner acceptable to Bank subject to
         the terms and conditions of this Agreement and Borrower's and Related
         Borrower's (as applicable) performance of and compliance with each of
         the Loan Documents, and so long as no event of default (including,
         without limitation, the breach of any warranty or representation)
         hereunder or under any of the other Loan Documents shall have occurred
         or be continuing (unless waived in writing by Bank).

                 3.2      The Term Loan advance shall be entered as a debit to
         Borrower's Loan Account.  Bank shall also record in Borrower's Loan
         Account all other charges, expenses and items properly chargeable to
         Borrower hereunder, all payments made by Borrower on account of
         indebtedness under the Term Loan and other appropriate debits and
         credits.  The debit balance of Borrower's Loan Account shall reflect
         the amount of Borrower's indebtedness from time to time hereunder.
         Nothing in this Section 3 shall be deemed to extend the maturity date
         of the Term Loan beyond the time noted in Section 14 hereof.

         SECTION 4. INSPECTION OF RECORDS; FURTHER ASSURANCE.

                 4.1      Borrower shall at reasonable times and from time to
         time, and in any event, not less than quarterly, allow Bank, by or
         through any of its officers, agents, employees, attorneys or
         accountants to (i) examine, inspect and make extracts from Borrower's
         books and records; (ii) analyze Borrower's





Term Credit and Security Agreement                                        Page 6
<PAGE>   7
         financial statements; (iii) arrange for verification of Borrower's
         Accounts Receivable under reasonable procedures, directly with Account
         Debtors or by other methods; and (iv) inspect, review and audit any
         Collateral at any time during normal business hours,  without prior
         notice to Borrower.  Borrower shall allow, do, make, execute and
         deliver all such additional and further acts, things, deeds,
         assurances and instruments which Bank may require more completely to
         vest in and assure to Bank its rights hereunder or in any Collateral.

         SECTION 5.  SECURITY INTEREST OF BANK IN COLLATERAL.

                 5.1      As security for the payment and performance of all
         Liabilities, Bank shall have and is hereby granted a continuing lien
         on and security interest in the following Collateral:

                 (a)      Borrower's Opseis Eagle seismic data gathering and
                          recording system, whether now or hereafter owned,
                          existing, created, arising or acquired;

                 (b)      all Borrower's Accounts, Accounts Receivable, notes,
                          notes receivable, contracts, contract rights, leases,
                          lease payments, rental agreements, rentals, drafts,
                          documents, title retention and lien instruments,
                          security agreements, acceptances,  instruments,
                          conditional sales contracts, chattel mortgages,
                          chattel paper, general intangibles and other forms of
                          obligation and rights to payment and receivables
                          whether or not yet earned by  performance, whether
                          now or hereafter owned, existing, created, arising or
                          acquired;

                 (c)      all Borrower's Inventory, goods, merchandise and
                          other personal property held for sale, lease, rental
                          or licensing by Borrower, or furnished or to be
                          furnished under a contract  of service, raw
                          materials, work in process, component parts,
                          materials, and supplies used  or to be used, or
                          consumed or to be consumed in Borrower's business,
                          and related products, wherever located, all goods
                          represented thereby, and all such goods that may  be
                          reclaimed or repossessed from or returned by
                          Borrower's customers and all shipping and packaging
                          materials related to the foregoing, whether now or
                          hereafter owned, existing, created, arising or
                          acquired;

                 (d)      all Borrower's general intangibles, whether now or
                          hereafter owned, existing, created, arising or
                          acquired;

                 (e)      all Borrower's equipment described or referenced in
                          Exhibit B hereto, whether now or hereafter owned,
                          existing, created, arising or acquired;

                 (f)      all goods, instruments, notes, notes receivable,
                          documents, documents of title, contracts, policies
                          and certificates of title and policies and
                          certificates of insurance, securities, chattel paper,
                          deposits, papers, agreements, cash and other property
                          now or hereafter owned by Borrower or in which it now
                          or hereafter has an interest, which are now or may
                          hereafter be in the possession of Bank, or which are
                          otherwise assigned to Bank, or  as to which Bank may
                          now or hereafter control possession by documents of
                          title or  otherwise; and

                 (g)      all substitutions, accessions, additions, parts,
                          accessories, attachments, replacements, Proceeds and
                          products of, to and for any and all of the foregoing,
                          including, without limitation, any and all tort and
                          insurance proceeds and any and all income and other
                          proceeds and payments from the sale, lease,
                          collection, licensing, transfer, exchange,
                          disposition or use of any and all of the foregoing,
                          and any and all substitutions, accessions, additions,
                          parts, accessories, attachments, replacements,
                          Proceeds and





Term Credit and Security Agreement                                        Page 7
<PAGE>   8
                          products in the form of any of the property described
                          or referenced in (a) through (f)  above.

                 No submission by Borrower to Bank of any schedule or other
                 particular identification of Collateral shall be necessary to
                 vest in Bank title to or a security interest in each and every
                 item of Collateral now existing or hereafter created or
                 acquired, but rather, such title and security interest shall
                 vest in tank immediately upon the creation or acquisition of
                 any item of Collateral, without the necessity for any other or
                 further action by Borrower or Bank, provided, however, that
                 Borrower shall execute such other and additional documents,
                 instruments and agreements as reasonably may be required by
                 Bank to evidence the security interests contemplated hereby.

                 5.2      To the extent allowable under applicable law, the
         Uniform Commercial Code of Alabama shall govern the security interests
         provided  for  herein.  In  connection  therewith,  Borrower (at
         Borrower's expense) shall take such steps and execute, deliver and
         file (as  applicable) (or cause the execution, delivery and filing (as
         applicable) of) such financing statements, continuation statements,
         agreements (including, without limitation, security agreements and
         landlord, creditor and mortgagee subordination agreements), documents,
         and papers (all in form and substance acceptable to Bank) as Bank may
         from time to time request to perfect or preserve the perfection and
         priority of Bank's security interests granted hereby or by any of the
         other Loan Documents.

                 5.3      If, notwithstanding the foregoing, by reason of
         location of Borrower, the Collateral or otherwise, the creation,
         validity, or perfection of security interests provided for herein are
         governed by the law of a jurisdiction other than Alabama, Borrower
         shall take such steps and execute and deliver such documents,
         agreements, papers and financing statements as Bank may from time to
         time request to comply with the Uniform Commercial Code, the Uniform
         Trust Receipts Act, the Factors Lien Act, or other laws  of other
         states or jurisdictions.  Borrower hereby appoints and empowers Bank,
         or any employee of Bank  which Bank may designate for the purpose, as
         its attorney-in-fact, to execute (and file, as appropriate) on  its
         behalf any documents, agreements, papers and financing statements (at
         Borrower's expense) which, in Bank's sole judgment, are necessary to
         be executed and/or filed in order to perfect or preserve the
         perfection and priority of Bank's security interests granted hereby or
         by any of the other Loan Documents.

                 5.4      Borrower shall not pledge, mortgage, or create or
         suffer to exist a security interest in any of the Collateral or any
         Proceeds or products thereof,or sell, assign or create a security
         interest in any of the Collateral or any Proceeds or products thereof
         in favor of any person other than Bank unless (i) otherwise allowed
         under the  terms of this Agreement or the Related Loan Agreement or
         (ii) such security interest is expressly subordinate to Bank's
         security interest therein and Bank has approved in writing the
         existence and priority of such security interest.  Nothing in this
         Section 5 shall be deemed to extend the maturity date of the Term Loan
         beyond the time noted in Section 14 hereof.

         SECTION 6.  COLLECTION OF ACCOUNTS RECEIVABLE.

                 6.1      Until  Bank  requests  that  Account  Debtors  on
         Accounts  Receivable  of  Borrower be notified of Bank's security
         interest therein, Borrower shall continue to collect such Accounts
         Receivable.  Proceeds transmitted to Bank may be handled and
         administered in and through a remittance or special  account; the
         maintenance of any such account shall be solely for the convenience of
         Bank, and Borrower shall not have any right, title, or interest in or
         to any such account or in the amounts at any time appearing  to the
         credit thereof.  Bank may apply and credit Proceeds so transmitted or
         otherwise received by Bank  against the outstanding balance in
         Borrower's Loan Account, however, Bank shall not be required to credit
         Borrower's Loan Account with the amount of any check or other
         instrument constituting provisional payment until Bank has received
         final payment thereof at its office in cash or solvent credits
         accepted by  Bank.  After the occurrence of an event of default
         hereunder, Borrower shall, at the request of Bank, notify





Term Credit and Security Agreement                                        Page 8
<PAGE>   9
         the Account Debtors of the security interest of Bank in any Account
         and shall instruct Account Debtors to remit payments directly to Bank;
         and Bank may itself so notify Account Debtors.

                 6.2     Borrower (i) shall (a) deliver any instrument
         evidencing an Account to Bank, and (b) use its best efforts to collect
         all of its Accounts in a commercially reasonable manner; and (ii)
         agrees that no court action or other legal proceeding or garnishment,
         attachment, repossession of property, detinue, sequestration or any
         other repossession shall be attempted by Borrower except by or under
         the direction of competent legal counsel.  Borrower hereby agrees to
         indemnify and hold Bank harmless for any loss or liability of any kind
         or character which may be asserted against Bank by virtue of any suit
         filed, process issued, or any repossession or attempted repossession
         done or attempted by Borrower or by virtue of any other actions or
         endeavors which Borrower may make to collect any Collateral.  Nothing
         in this Section 6 shall be deemed to extend the availability of the
         Revolving Line beyond the time noted in Section 14 hereof.

         SECTION 7.  ADDITIONAL AFFIRMATIVE COVENANTS.

         Until all indebtedness of Borrower to Bank has been paid in full  and
all  Liabilities  have  been satisfied:

                 7.1      Borrower shall submit or cause to be submitted to
         Bank such financial and other information which Bank shall request
         regarding Borrower, Related Borrower, the Collateral and any endorser,
         guarantor or surety of any  of the Liabilities when and as requested
         by Bank, including without limitation: (i) Related Borrower's 10-Q
         reports  together with Related Borrower's internally prepared
         quarterly financial statements within forty-five  (45)  days  after
         the close of each quarter in each fiscal year including a balance
         sheet as of the close of such period, an  income statement, and a
         reconciliation of surplus for such period, prepared and analyzed in
         accordance with  generally accepted accounting principles and attested
         to by an authorized officer of Related Borrower; (ii) Related
         Borrower's 10-K reports and audited fiscal year-end financial
         statements, within ninety (90) days after the close of each fiscal
         year, including a balance sheet as of the close of such period, an
         income statement, and a reconciliation of stockholders' equity
         certified by an independent certified public accountant acceptable to
         Bank and analyzed in accordance with generally accepted accounting
         principles; (iii) Related Borrower's 8-K reports and all other
         documents filed by or on behalf of Related Borrower with the
         Securities and Exchange Commission (the "SEC") within thirty (30)
         days, following the filing thereof with the SEC; and (iv) together
         with each delivery of the financial statements and the 8-K reports
         required by (ii) or (iii) above, the certificate of Borrower stating
         that no event has occurred which constitutes an event of default or
         would constitute an event of default but for the requirement that
         notice be given, or time elapse or both, under any loans,  notes,
         debentures, bonds, leases, or other obligations of Borrower then
         outstanding, including, but not limited to, the Term  Loan (such
         certificate shall publish the accounting calculations used to
         determine compliance or noncompliance with Related Borrower's
         financial obligations, including those noted in this Agreement), or,
         if any such event of default or defaults exists, specifying the nature
         thereof.

                 7.2      Borrower shall (i) maintain insurance (written by
         insurance companies acceptable to Bank) in form, amount and substance
         acceptable to Bank; (ii) furnish to Bank, upon request, a statement of
         the insurance coverage; and (iii) cause Bank to be named as (a) an
         additional insured on all Borrower's liability insurance policies; and
         (b) a payee as to all insurance covering Collateral hereunder,
         pursuant to a New York (long form) standard mortgagee endorsement. All
         insurance policies shall provide for a minimum of ten (10) days'
         written cancellation notice to Bank and, at Bank's request, all
         policies shall be delivered to and held by Bank. In the event of
         default hereunder, Bank is hereby made attorney-in-fact for Borrower
         to obtain, adjust, and settle, in its sole discretion, such insurance
         and to endorse any drafts or checks issued in connection with such
         insurance. In the event of failure to provide and maintain insurance
         required by this Agreement, Bank may, at its option, provide such
         insurance and charge the costs and expenses incurred to Borrower's
         Loan Account.





Term Credit and Security Agreement                                        Page 9
<PAGE>   10
                 7.3      Borrower does and shall at all times while any
         Liabilities remain unsatisfied comply with all laws, ordinances, rules
         and regulations of any governmental authority or entity governing or
         affecting Borrower, any of its property, the Collateral or any part
         thereof, and shall immediately notify Bank of any and all actual,
         alleged or asserted violations of any such laws, ordinances, rules or
         regulations if such violation would or could have a material adverse
         effect on Borrower. Without limitation to the generality of the
         foregoing, Borrower shall comply, and cause to be complied with, all
         laws, governmental standards and regulations applicable to Borrower or
         any Collateral in respect of occupational health and safety, toxic and
         hazardous waste and substances and environmental matters. Borrower
         promptly shall notify Bank of receipt of any notice of any actual,
         alleged or asserted violation of any such law, standard or regulation.
         Borrower hereby agrees to indemnify, defend and hold Bank harmless
         from all loss, cost, damage, claim and expense incurred by Bank on
         account of Borrower's breach of any representation, warranty or
         requirement of this Section, Borrower's failure to perform the
         obligations of this Section, and/or Borrower's or any Collateral's
         violating any applicable laws, ordinances, rules or regulations,
         including, without limitation, any environmental or occupational
         health and safety laws or regulations. This indemnification shall
         survive the closing of the Term Loan, payment of the Term Loan and the
         exercise of any right or remedy under any of the Loan Documents.
         Borrower represents that there are no pending claims or threats of
         claims by private or governmental or administrative authorities
         relating to environmental impairment, conditions, or regulatory
         requirements involving Borrower or any Collateral.

                 7.4      Borrower shall cause Related Borrower to have
         maintained, as tested at the end of each fiscal year, a minimum Gross
         Cash Flow (defined as net profit plus depreciation, amortization and
         any other expenses which would be classified as non-cash expenses in
         accordance with generally accepted accounting principles) to Current
         Maturities of Long Term Debt plus investments in new Seismic Data
         coverage ratio of .75 to 1 for such fiscal year.

                 7.5      Borrower shall cause Related Borrower to maintain a
         minimum Tangible Net Worth of not less than $48,000,000 on and after
         the date hereof. In addition, Borrower shall cause Related Borrower's
         Tangible Net Worth to increase as of the end of each fiscal year by
         not less than the greater of (i) $2,500,000 or (ii) fifty percent
         (50%) of Related Borrower's net income after taxes for the fiscal year
         then ending.

                 7.6      Borrower shall cause Related Borrower to have a
         minimum net earnings each fiscal year of not less than the greater of
         (i) $2,500,000 or (ii) fifty percent (50%) of Related Borrower's net
         income after taxes for the fiscal year then ending.

                 7.7      Promptly after the same shall have become known to
         Borrower, Borrower shall notify Bank in writing of any action, suit or
         proceeding at law or in equity or by or before any governmental
         instrumentality or other agency which, if adversely determined, could
         reasonably be expected to materially impair the ability of Borrower to
         perform its obligations under the Loan Documents, materially impair
         the ability of Borrower to carry on its business substantially as now
         conducted, or which might materially affect the business, operations,
         properties, assets or conditions, financial or otherwise, of Borrower.
         Nothing in this Section 7 shall be deemed to extend the maturity date
         of the Term Loan beyond the time noted in Section 14 hereof.

         SECTION 8. ADDITIONAL NEGATIVE COVENANTS.

         Until all indebtedness of Borrower to Bank has been paid in full and
         all Liabilities have been satisfied:

                 8.1      Borrower shall not create or permit the creation of
         any lien upon any of its property, except for Permitted Encumbrances.





Term Credit and Security Agreement                                       Page 10
<PAGE>   11
                 8.2      Borrower shall not borrow any money other than for
         trade credit in the ordinary course of business unless such loans
         shall be fully subordinated hereto. Borrower shall not guarantee,
         endorse or assume, either directly or indirectly, any indebtedness of
         any other corporation, person, or entity.

                 8.3      Without Bank's prior written consent, Borrower shall
         not (i) liquidate, discontinue or materially reduce its normal
         operations with intention to liquidate; (ii) cause, allow or suffer to
         occur (a) the merger or consolidation of or involving Borrower with or
         into any corporation, partnership, or other entity; or (b) the sale,
         leasing, licensing, transfer or other disposal of all or any
         substantial part of its assets; (iii) acquire any interest(s) in any
         corporation, partnership or other entity, whether by stock or asset
         purchase or acquisition or otherwise; (iv) enter into any lease which
         could be characterized a-s a capitalized lease; or (v) cause, allow,
         or suffer to occur any change in the nature of the business of
         Borrower.

                 8.4      Borrower shall not cause, allow or suffer to occur
         Related Borrower to make any payment of principal upon Related
         Borrower's Subordinated Debentures without Bank's prior written
         consent.

                 8.5      Borrower shall not cause, allow or suffer to occur
         Related Borrower's Total Debt to Tangible Net worth ratio to exceed 1
         to 1.

                 8.6      Borrower shall not make or extend or allow to remain
         outstanding any loans or advances to or investments in Borrower's
         affiliates, parent, subsidiaries, shareholders, owners, directors,
         employees, officers, partners, management or other related persons or
         entities without the prior written consent of Bank in excess of
         $500,000 in the aggregate. Nothing in this Section 8 shall be deemed
         to extend the maturity date of the Term Loan beyond the time noted in
         Section 14 hereof.

         SECTION 9. EVENTS OF DEFAULT; ACCELERATION.

         Any or all of the Liabilities, shall be, at the option of Bank and
         notwithstanding any time or credit allowed by any instrument
         evidencing any of the Liabilities, immediately due and payable without
         notice or demand, and the obligation of Bank to make any advances to
         or on behalf of Borrower shall immediately cease and terminate upon
         the occurrence of any of the following events of default:

                 (a)      default in the payment or performance, when due or
                          payable, of any of the Liabilities, or of any
                          liability or obligation (whether now or hereafter
                          existing, arising or incurred, direct or indirect,
                          conditional or unconditional) of any endorser,
                          guarantor, or surety for any of the Liabilities;

                  (b)     failure by Borrower or any other person or entity, as
                          applicable, to (i) pay or perform any act or
                          obligation imposed hereby or by any of the other Loan
                          Documents, or (ii) comply with any of the terms,
                          conditions, warranties, covenants or requirements
                          contained or referenced in one or more of the Loan
                          Documents;

                 (c)      failure of Borrower or any other person or entity, as
                          applicable, to pay when due (i) any tax (unless such
                          tax is being diligently contested in good faith by
                          appropriate proceedings which contest does not or
                          could not, in Bank's reasonable opinion, materially
                          jeopardize Bank's rights or priority in or to any
                          Collateral) or (ii) any premium on any (a) insurance
                          policy assigned to Bank, or (b) any insurance
                          covering any Collateral;

                 (d)      if any warranty or representation contained herein
                          shall prove false or materially misleading or if
                          Borrower or any endorser, guarantor or surety for any
                          of the Liabilities made or makes any other material
                          misrepresentation to Bank for the purpose of
                          obtaining credit or any extension of credit;





Term Credit and Security Agreement                                       Page 11
<PAGE>   12
                 (e)      failure of Borrower or any endorser, guarantor, or
                          surety for any of the Liabilities to furnish
                          financial information or to permit the inspection of
                          the books or records or Collateral of Borrower or of
                          any endorser, guarantor or surety for any of the
                          Liabilities;

                 (f)      issuance of an injunction, attachment or judgment
                          against Borrower or any endorser, guarantor or surety
                          for any of the Liabilities, or of any property of
                          such persons or entities, if such injunction,
                          attachment or judgment does or could, in Bank's
                          reasonable opinion, materially jeopardize Bank's
                          rights or priority in or to any Collateral and is not
                          dissolved, discharged or bonded within thirty (30)
                          days of the issuance thereof; the general assignment
                          for the benefit of creditors, or filing a petition in
                          bankruptcy, by Borrower or any endorser, guarantor or
                          surety for any of the Liabilities; the filing of a
                          petition in bankruptcy against Borrower or any
                          endorser, guarantor or surety for any of the
                          Liabilities if such petition is not dismissed within
                          sixty (60) days; if Borrower or any endorser,
                          guarantor or surety for any of the Liabilities shall
                          file an application in any court for the appointment
                          of a receiver for Borrower or any such other person
                          or entity; the appointment of a receiver for Borrower
                          or any endorser, guarantor or surety for any of the
                          Liabilities; or the death, dissolution, incapacity or
                          liquidation of Borrower or any endorser, guarantor or
                          surety for any of the Liabilities;

                 (g)      calling of a meeting of creditors, appointment of a
                          committee of creditors or liquidation agents, or
                          offering of a composition or extension to creditors
                          by Borrower or by any endorser, guarantor or surety
                          for any of the Liabilities;

                 (h)      bankruptcy or Insolvency of Borrower or of any
                          endorser, guarantor or surety for any of the
                          Liabilities;

                 (i)      any change in the nature of the business of or
                          acquisition by a person, entity, corporation or group
                          of more than fifty percent (50%) of the outstanding
                          voting stock or securities of Borrower or Related
                          Borrower (except for such an acquisition of Borrower,
                          voting stock or securities by a fifty-one percent
                          (51%) or more owned subsidiary of Related Borrower)
                          without the prior written consent of Bank;

                 (j)      failure of Borrower or any other person or entity, as
                          applicable, to maintain any insurance required
                          hereunder and/or assigned or pledged to Bank in
                          connection herewith;

                 (k)      occurrence or continuation of any default or event of
                          default by or attributable to Borrower under or in
                          connection with any mortgage, lease, Participation
                          Agreement, Licensing Agreement, security agreement,
                          note, bond indenture, loan agreement or similar
                          instrument or agreement to which Borrower is now or
                          may hereafter be a party or by which Borrower or any
                          of its property (including, without limitation, the
                          Collateral) is now or may hereafter be bound or
                          affected if such default or event of default would or
                          could have a material adverse effect on Borrower;

                 (l)      fraud or material misrepresentation by Borrower (or
                          any of its agents or employees) in connection with
                          any transactions contemplated hereby;

                 (m)      such a change in the condition or affairs (financial
                          or otherwise) of Borrower or of any endorser,
                          guarantor or surety for any of the Liabilities or of
                          the Collateral or any other source of repayment of or
                          security for any of the Liabilities which, in the
                          opinion of Bank, impairs Bank's security or increases
                          its risk;





Term Credit and Security Agreement                                       Page 12
<PAGE>   13
                 (n)      breach or violation of or failure to abide by any
                          covenant, term or provision of this Agreement, the
                          Note or any of the other Loan Documents; or the
                          termination, cancellation or revocation of any Loan
                          Document without Bank's consent or the determination
                          by Bank that a material portion of the Accounts or
                          any of the Loan Documents is void, voidable or
                          unenforceable;

                 (o)      Borrower's discontinuing doing business for any
                          reason; or

                 (p)      any default or event of default under the Note, the
                          Related Loan Documents or any of the other Loan
                          Documents.

                 Provided, however, that Borrower shall not be in default
         hereunder upon the failure by Borrower or any other person or entity,
         as applicable, to perform any act or obligation, or comply with any of
         the terms, conditions, covenants or requirements contained in, any of
         Sections 2.6, 7.1 or 7.2 hereof, or upon the occurrence of any event
         of default described in Section 9(c), 9(j) or 9(m) hereof unless
         Borrower has failed to cure any such default within five (5) business
         days after notice from Bank of the existence of such default.

         SECTION 10. POWER TO SELL OR COLLECT COLLATERAL UPON THE OCCURRENCE OF
         ANY OF THE ABOVE EVENTS OF DEFAULT AND AT ANY TIME THEREAFTER.  Upon
         the occurrence of an), of the above events of default and at any time
         thereafter, Bank shall have, in addition to all other rights and
         remedies, the remedies of a secured party under the Uniform Commercial
         Code of Alabama (regardless of whether the Uniform Commercial Code has
         been enacted in the jurisdiction where rights or remedies are
         asserted), including, without limitation, the right to take possession
         of the Collateral, and for that purpose Bank may, so far as Borrower
         can give authority therefor, enter upon any premises on which the
         Collateral may be situated and remove the same therefrom or take
         possession of same and/or store the same on such premises pending
         disposition under the terms of this Agreement or applicable law; and
         insofar as Collateral shall consist of Accounts Receivable, insurance
         policies, instruments, chattel paper, general intangibles, choices in
         action or the like, Bank may demand, collect, receipt for, settle,
         compromise, adjust, sue for, foreclose or realize upon Collateral as
         Bank may determine, whether or not Liabilities or Collateral are then
         due, and for the purpose of realizing Bank's rights therein, Bank may
         receive, open and dispose of mail addressed to Borrower and endorse
         notes, checks, drafts, money orders, documents of title or other
         evidences of payment, shipment or storage or any form of Collateral on
         behalf of and in the name of Borrower as Borrower's attorney-in-fact
         for such purpose. Bank may require Borrower to assemble the Collateral
         and make it available to Bank at a place designated by Bank which is
         reasonably convenient to both parties. Unless the Collateral is
         perishable or threatens to decline speedily in value or is of a type
         customarily sold on a recognized market, Bank shall give to Borrower
         at least five (5) days' written notice of the time and place of any
         public sale of Collateral or of the time after which any private sale
         or any other intended disposition is to be made.  Bank may, at any
         time, in its discretion, transfer any securities or other property
         constituting Collateral into its own name or that of its nominee and
         receive the income therefrom and hold the same as security for the
         Liabilities or apply it on principal, interest, charges or expenses
         due on Liabilities in any manner deemed appropriate by Bank. Bank may
         apply Collateral and the Proceeds from any Collateral against the
         Liabilities secured hereby in any manner deemed appropriate by Bank.
         The enumeration of the foregoing rights is not intended to be
         exhaustive, and the exercise of any right shall not preclude the
         exercise of any other rights, all of which shall be cumulative. As
         against the obligations secured hereby, to the extent allowed by law,
         Borrower hereby expressly waives all claims and all rights to claim
         any exemptions, both as to personal and real property, allowed or
         allowable under the Constitution or laws of the United States, the
         State of Alabama or any other jurisdiction. Any notice to Borrower of
         sale, disposition or other intended action by Bank, required by law to
         be given to Borrower, sent to Borrower at the address of Borrower
         shown on the first page of this Agreement or at such other address





Term Credit and Security Agreement                                       Page 13
<PAGE>   14
         of Borrower as may from time to time be shown on Bank's records, at
         least five (5) days prior to such action, shall constitute reasonable
         notice to Borrower.

         SECTION 11. SET OFF.  Bank and any participant and any holder of all
         or any part of the Liabilities are hereby given as additional security
         for all Liabilities a continuing lien and security interest in and
         upon any and all moneys, securities and other property of Borrower,
         and the Proceeds thereof, now or hereafter held or received by or in
         transit to Bank (or such participant or holder) from or for Borrower,
         whether for safekeeping, custody, pledge, transmission, collection or
         otherwise, and also upon any and all deposit balances (general or
         special) and credits of Borrower with, and any and all claims of
         Borrower against Bank (or such participant or holder) at any time
         existing, and upon the occurrence of an event of default hereunder,
         Bank (or such participant or holder) may apply or set off the same
         against the Liabilities secured hereby in any manner deemed
         appropriate by Bank (or such participant or holder). Borrower agrees
         that any other person or entity purchasing a participation from Bank
         may exercise all its rights of payment (including the right of
         set-off) with respect to such participation as fully as if such person
         or entity were the direct creditor of Borrower in the amount of such
         participation.

         SECTION 12. NO WAIVERS.  Borrower waives demand, presentment, protest,
         notice of protest, notice of intent to accelerate, notice of
         acceleration, notice of acceptance of this Agreement, and notice of
         advances and loans made, credit extended, Collateral received or
         delivered or other action taken in reliance hereon and all other
         demands and notices of any description. With respect both to the
         Liabilities and Collateral, Borrower assents to any extension or
         postponement of the time of payment or any other indulgence, to any
         substitution, exchange or release of any or all of the Collateral, to
         the addition or release of any party or person primarily or
         secondarily liable, to the acceptance of partial payments thereon and
         the settlement, compromising or adjusting of any thereof, all in such
         manner and at such time or times as Bank may deem advisable. Bank
         shall have no duty as to the collection or protection of any or all of
         the Collateral or any income therefrom, nor as to the preservation of
         any rights against prior parties, nor as to the preservation of any
         rights pertaining thereto beyond the safe custody of Collateral in its
         possession. Bank may exercise its rights with respect to Collateral
         without resorting or regard to other Collateral or sources of
         reimbursement for the Liabilities.  Bank shall not be deemed to have
         waived any of its rights upon or under any of the Liabilities or
         Collateral unless such waiver be in writing and signed by Bank. No
         course of dealing and no delay or omission on the part of Bank in
         exercising any right shall operate as a waiver of such right or any
         other right. A waiver on any one occasion shall not be construed as a
         bar to or waiver of any right on any further occasion. All rights and
         remedies of Bank with respect to Liabilities or Collateral, whether
         evidenced hereby, by any of the other Loan Documents or by any other
         instrument or paper, shall be cumulative and may be exercised
         singularly or concurrently.

         SECTION 13. EXPENSES, PROCEEDS OF COLLATERAL.  Irrespective of whether
         the proceeds of the Term Loan are disbursed, Borrower shall pay all
         fees and expenses, including, without limitation, legal fees and
         expenses, filing fees, insurance premiums and expenses, appraisal
         fees, liabilities and expenses, recording costs and taxes incurred by
         Bank or Borrower from time to time in connection with the preparation
         and closing, filing, administration, amendment, and modification of
         the Term Loan, this Agreement, the Note, and other Loan Documents and
         those documents and instruments associated with the perfection and
         creation of the security interests granted pursuant hereto or pursuant
         to any of the other Loan Documents.  Borrower shall pay to Bank on
         demand any and all such fees and expenses together with any and all
         fees, expenses and costs (a) of collection or (b) otherwise incurred
         or paid by Bank in protecting or enforcing its rights upon or with
         respect to any of the Liabilities, the Loan Documents or the
         Collateral (including, without limitation, reasonable counsel fees,
         including, without limitation, those incurred in connection with any
         appeal or any bankruptcy proceedings). After deducting all of said
         expenses, the residue of any proceeds of collection or sale of
         Liabilities or Collateral shall be applied to the payment of principal
         of, interest on, and charges and expenses related to the Liabilities
         in such order or preference as Bank may





Term Credit and Security Agreement                                       Page 14
<PAGE>   15
         determine, and, lo the extent allowed by law, any excess shall be
         returned to Borrower and Borrower shall remain liable for any
         deficiency.

         SECTION 14. DURATION; EXTENSION.  The final maturity date of the Term
         Loan shall be June 1, 1998, at which time all principal, interest,
         charges and expenses outstanding hereunder, under the Note or under
         any of the other Loan Documents (regarding the Term Loan) shall be due
         and payable in full unless due sooner under the terms of the Note,
         this Agreement or any of the other Loan Documents. No modification or
         amendment of this Agreement or extension of the maturity date of the
         Term Loan shall be effective unless placed in writing and.duly
         executed by Bank and Borrower. It is expressly agreed that this
         Agreement shall survive the maturity of the Term Loan in all respects
         necessary for Bank to exercise its rights and remedies hereunder and
         with respect to the Collateral. The maturity of the Term Loan shall in
         no way affect any transactions entered into or rights created or
         obligations incurred prior to such maturity; rather, such rights and
         obligations shall be fully operative until the same are fully disposed
         of, concluded and/or liquidated. Without limitation to the generality
         of the foregoing, such maturity shall not release nor diminish any of
         (i) Borrower's obligations and agreements, or (ii) Bank's rights and
         remedies arising hereunder or in connection herewith until full
         payment and performance of all of the Liabilities. This Agreement
         shall be a continuing agreement in every respect.

         SECTION 15. GENERAL.  Any demand upon or notice to Borrower that Bank
         may elect to give shall be effective upon delivery if such notice is
         given personally, or upon dispatch if deposited in the mails or
         delivered to a telegraph, wireless or radio company addressed to
         Borrower at the address noted on the first page of this Agreement or,
         if Borrower has notified Bank in writing of a change of address, to
         Borrower's last address so notified. Demands or notices addressed to
         Borrower's address at which Bank customarily communicates with
         Borrower shall also be effective. If at any time or times by
         assignment or otherwise Bank transfers any Liabilities (either
         separately or together with the Collateral therefor), such transfer
         shall carry with it Bank's powers and rights under this Agreement with
         respect to the Liabilities and/or Collateral transferred, and the
         transferee shall become vested with said powers and rights whether or
         not they are specifically referred to in the transfer. If and to the
         extent Bank retains any other Liabilities or Collateral, Bank will
         continue to have the rights and powers herein set forth with respect
         thereto. THIS AGREEMENT AND ALL RIGHTS AND OBLIGATIONS HEREUNDER,
         INCLUDING MATTERS OF CONSTRUCTION, VALIDITY, AND PERFORMANCE, SHALL BE
         GOVERNED AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF
         ALABAMA, EXCEPT THAT ANY CONFLICT OF LAWS RULE OF SUCH JURISDICTION
         THAT WOULD REQUIRE REFERENCE TO THE LAWS OF SOME OTHER JURISDICTION
         SHALL BE DISREGARDED. ANY SUITS, CLAIMS OR CAUSES OF ACTION ARISING
         DIRECTLY OR INDIRECTLY FROM THIS AGREEMENT, THE NOTE, OR ANY OTHER
         AGREEMENTS OR INSTRUMENTS BETWEEN BANK AND BORROWER RELATING TO SUCH
         DOCUMENTS SHALL BE BROUGHT IN A COURT OF APPROPRIATE JURISDICTION ONLY
         IN JEFFERSON COUNTY, ALABAMA AND OBJECTIONS TO VENUE AND PERSONAL
         JURISDICTION IN SUCH FORUM ARE HEREBY EXPRESSLY WAIVED.  BORROWER
         AGREES THAT THE TERM LOAN, THIS AGREEMENT AND ALL OF THE OTHER LOAN
         DOCUMENTS, INCLUDING MATTERS OF CONSTRUCTION, VALIDITY AND
         PERFORMANCE, SHALL BE GOVERNED BY AND CONSTRUED UNDER THE LAWS OF THE
         STATE OF ALABAMA, INCLUDING, WITHOUT LIMITATION, APPLICABLE USURY
         LAWS. THIS AGREEMENT HAS BEEN NEGOTIATED AND IS BEING EXECUTED AND
         DELIVERED IN THE STATE OF ALABAMA, OR IF EXECUTED ELSEWHERE, SHALL
         BECOME EFFECTIVE UPON BANK'S RECEIPT AND ACCEPTANCE OF THE EXECUTED
         ORIGINAL OF THIS AGREEMENT IN THE STATE OF ALABAMA; PROVIDED, HOWEVER,
         THAT BANK SHALL HAVE NO OBLIGATION TO GIVE, NOR SHALL BORROWER BE
         ENTITLED TO RECEIVE ANY NOTICE OF SUCH ACCEPTANCE FOR THIS AGREEMENT
         TO BECOME A BINDING OBLIGATION OF BORROWER. IT IS INTENDED, AND
         BORROWER AND BANK SPECIFICALLY AGREE, THAT THE LAWS OF THE STATE OF
         ALABAMA GOVERNING INTEREST SHALL APPLY TO THIS





Term Credit and Security Agreement                                       Page 15
<PAGE>   16
         TRANSACTION. BORROWER HEREBY ACKNOWLEDGES THAT (I) THE NEGOTIATION,
         EXECUTION, AND DELIVERY OF THE LOAN DOCUMENTS CONSTITUTE THE
         TRANSACTION OF BUSINESS WITHIN THE STATE OF ALABAMA, (II) ANY CAUSE OF
         ACTION ARISING UNDER ANY OF SAID LOAN DOCUMENTS WILL BE A CAUSE OF
         ACTION ARISING FROM SUCH TRANSACTION OF BUSINESS, AND (III) BORROWER
         UNDERSTANDS, ANTICIPATES, AND FORESEES THAT ANY ACTION FOR ENFORCEMENT
         OF PAYMENT OF BORROWER'S LIABILITIES OR THE LOAN DOCUMENTS MAY BE
         BROUGHT AGAINST IT IN THE STATE OF ALABAMA. TO THE EXTENT ALLOWED BY
         LAW, BORROWER HEREBY SUBMITS TO JURISDICTION IN THE STATE OF ALABAMA
         FOR ANY ACTION OR CAUSE OF ACTION ARISING OUT OF OR IN CONNECTION WITH
         BORROWER'S LIABILITIES OR THE LOAN DOCUMENTS AND WAIVES ANY AND ALL
         RIGHTS UNDER THE LAWS OF ANY STATE OR JURISDICTION TO OBJECT TO
         JURISDICTION OR VENUE WITHIN JEFFERSON COUNTY, ALABAMA;
         NOTWITHSTANDING THE FOREGOING, NOTHING CONTAINED IN THIS PARAGRAPH
         SHALL PREVENT BANK FROM BRINGING ANY ACTION OR EXERCISING ANY RIGHTS
         AGAINST BORROWER, ANY GUARANTOR, ANY SECURITY FOR THE LIABILITIES, OR
         ANY OF BORROWER'S OR ANY GUARANTOR'S PROPERTIES IN ANY OTHER COUNTY,
         STATE, OR JURISDICTION. INITIATING SUCH ACTION OR PROCEEDING OR TAKING
         ANY SUCH ACTION IN ANY OTHER STATE SHALL IN NO EVENT CONSTITUTE A
         WAIVER BY BANK OF ANY OF THE FOREGOING. Nothing contained herein, or
         in any of the documents contemplated hereby, shall be deemed to render
         Bank on the one hand, and Borrower on the other hand, partners or
         venturers for any purpose. This Agreement is intended to take effect
         as a sealed instrument.

         SECTION 16. COMPLIANCE WITH LAWS.  It is the intention of Bank and
         Borrower to conform strictly to any applicable usury laws (including,
         without limitation, the laws of Texas and the United States if and to
         the extent such laws other than Alabama laws are deemed applicable
         notwithstanding Section 15 above). Accordingly, if the transactions
         contemplated hereby would be usurious under any applicable law
         (notwithstanding Section 15 above) then, in that event,
         notwithstanding anything to the contrary in this Agreement, the other
         Loan Documents, or any other agreement or instrument entered into in
         connection with or as security for or guaranteeing the Term Loan, it
         is agreed as follows: (i) the aggregate of all consideration which
         constitutes interest under applicable law that is contracted for,
         taken, reserved, charged, or received by Bank under the Loan Documents
         or under any other agreement or instrument entered into in connection
         with or as security for or guaranteeing the Term Loan shall under no
         circumstances exceed the Highest Lawful Rate (as defined below), and
         any excess shall be cancelled automatically and, if theretofore paid,
         shall, at the option of Bank, be credited by Bank on the principal
         amount of any indebtedness owed to Bank by Borrower or refunded by
         Bank to Borrower, and (ii) in the event that the payment of the Term
         Loan is accelerated or in the event of any required or permitted
         prepayment, then such consideration that constitutes interest under
         law applicable to Bank may never include more than the Highest Lawful
         Rate and excess interest, if any, to Bank provided for in the Loan
         Documents or otherwise shall be cancelled automatically as of the date
         of such acceleration or prepayment and, if theretofore paid, shall, at
         the option of Bank, be credited by Bank on the principal amount of any
         indebtedness owed to Bank by Borrower or refunded by Bank to Borrower.

         "Highest Lawful Rate" means the maximum non-usurious interest rate
         (computed on the basis of a year of 365 or 366 days, as applicable)
         that at any time or from time to time may be contracted for, taken,
         reserved, charged, or received on amounts due to Bank, under laws
         applicable to Bank with regard to this Agreement that are presently in
         effect or, to the extent allowed by law, under such applicable laws
         that allow a higher maximum non-usurious rate than applicable laws now
         allow.

         SECTION 17. MISCELLANEOUS.  In the event of actual conflict in the
         terms and provisions of this Agreement and any of the other Loan
         Documents or any other document, instrument or agreement executed in
         connection with this Agreement or described or referred to in this
         Agreement, the terms and provisions





Term Credit and Security Agreement                                       Page 16
<PAGE>   17
         most favorable to Bank shall control. No modification, consent,
         amendment or waiver of any provision of this Agreement or any of the
         other Loan Documents, nor consent to any departure by Borrower or
         Related Borrower (as applicable) therefrom, shall be effective unless
         the same shall be in writing and signed by Bank, and then shall be
         effective only in the specific instance and for the purpose for which
         given. This Agreement and each of the other Loan Documents are binding
         upon Borrower and Related Borrower (as applicable), their respective
         successors and assigns, and inure to the benefit of Bank, its
         respective successors and assigns. All representations and warranties
         of Borrower and Related Borrower (as applicable) herein, and all
         covenants and agreements herein, in the other Loan Documents, or in
         any other document delivered hereunder or in connection herewith that
         are not fully performed before the date of this Agreement, shall
         survive such date.

         This Agreement and each of the other Loan Documents shall be deemed to
         be drafted by all parties hereto and shall not be construed against
         any party hereto. In the event any one or more of the terms or
         provisions contained in this Agreement, in any of the other Loan
         Documents or in any other instrument or agreement referred to herein
         or executed in connection with or as security for the Liabilities, or
         any application thereof to any person or circumstances, shall be
         declared prohibited, illegal, invalid or unenforceable to any extent
         in any jurisdiction, as determined by a court of competent
         jurisdiction, such term or provision, in that jurisdiction, shall be
         ineffective only to the extent of such prohibition, illegality,
         invalidity or unenforceability, or as applied to such persons or
         circumstances, without invalidating or rendering unenforceable the
         remaining terms or provisions hereof or thereof or affecting the
         validity or enforceability of such term or provision in any other
         jurisdiction or as to other persons or circumstances in such
         jurisdiction, unless such would effect a substantial deviation from
         the general intent and purpose of the parties, make a significant
         change in the economic effect of the transactions contemplated herein
         on Bank, or impair the validity or perfection of Bank's security
         interest in any Collateral or the validity of any guaranty or other
         security for the Liabilities, in which event a substitute provision
         shall be supplied by the court in order to provide Bank with the
         benefits intended by such invalid term or provision.

         IN WITNESS WHEREOF, the parties hereto have hereunder set their hands
and seals on this 15th day of July, 1993.

                                            BORROWER:
                              
WITNESS:                                    SEITEL GEOPHYSICAL, INC.
                              
                              
By: /s/ [illegible signature]               By: /s/ Debra D. Valice
                                            Its: Secretary/Treasurer
                              
                                            BANK:
                              
                                            CENTRAL BANK OF THE SOUTH
                              
                                            By: /s/ Terry W. Gasken
                                            Its:  Vice President





Term Credit and Security Agreement                                       Page 17
<PAGE>   18
STATE OF 
         -----------
COUNTY OF 
          ----------

         I, the undersigned Notary Public, in and for said County in said
State, hereby certify that Debra D. Valice, whose name as Secretary/Treasurer
of SEITEL GEOPHYSICAL, INC., a Delaware corporation, is signed to the foregoing
instrument and who is known to me, acknowledged before me on this day that,
being informed of the contents of the instrument, she, as such officer and with
full authority, executed the same voluntarily for and as the act of said
corporation.

         Given under my hand this the 15th day of July, 1993.


                                            /s/
                                            Notary Public
[NOTARIAL SEAL]                             My commission expires: 4-18-94


STATE OF 
         --------------
COUNTY OF 
          -------------

         Before me, the undersigned notary public in and for said County in
said State, on this day personally appeared ________________, known to me to be
the person whose name is subscribed to the foregoing instrument, and known to
me to be ______________ of SEITEL GEOPHYSICAL, INC., a Delaware corporation,
and acknowledged to me that _he executed said instrument for the purposes and
consideration therein expressed, and as the act of said corporation.

         Given under my hand this the     day of                   , 1993.
                                      ---        ------------------

                                          
                                          --------------------------------------
                                          Notary Public
[NOTARIAL SEAL]                           My commission expires:





Term Credit and Security Agreement                                       Page 18
<PAGE>   19
STATE OF ALABAMA

COUNTY OF JEFFERSON

         I, the undersigned Notary Public, in and for said County in said
State, hereby certify that Terry W. Gasken, whose name as Vice President of
CENTRAL BANK OF THE SOUTH, an Alabama banking corporation, is signed to the
foregoing instrument and who is known to me, acknowledged before me on this day
that, being informed of the contents of the instrument, he, as such officer and
with full authority, executed the same voluntarily for and as the act of said
corporation.

         Given under my hand this the 15th day of July, 1993.


                                            /s/
                                            Notary Public
[NOTARIAL SEAL]                             My commission expires: 4/18/94





Term Credit and Security Agreement                                       Page 19
<PAGE>   20

                          LOAN MODIFICATION AGREEMENT
                        AND AMENDMENT TO LOAN DOCUMENTS


         THIS LOAN MODIFICATION AGREEMENT AND AMENDMENT TO LOAN DOCUMENTS (this
"Agreement") is being entered into effective as of the 28th day of December,
1995, by and between COMPASS BANK, an Alabama state banking corporation
("Bank") and SEITEL GEOPHYSICAL, INC., a Delaware corporation ("Borrower").

                                P R E A M B L E

         In July, 1993, Bank and Borrower executed that certain Term Credit and
Security Agreement (the "Agreement") governing Borrower's $4,300,000 term loan
(the "Term Loan"). In connection with the Term Loan, Borrower executed in favor
of Bank that certain Term Note in the principal amount of FOUR MILLION THREE
HUNDRED THOUSAND AND NO/100 DOLLARS ($4,300,000.00) (the "Note"), along with
other loan documents and instruments evidencing, securing, relating to,
guaranteeing or otherwise executed or delivered in connection with the Term
Loan (jointly and severally with the Agreement and the Note, the "Loan
Documents").

         Effective as of the date set forth above, Borrower requested, and Bank
agreed, to modify certain financial covenants relating to the Term Loan as more
specifically set forth below.

                               A G R E E M E N T

         NOW, THEREFORE, in consideration of the premises, the mutual
agreements of the parties as set forth herein, and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged,
and to induce Bank to modify certain financial covenants relating to the Term
Loan, the parties, intending to be legally bound hereby, agree as follows:

         1.      AMENDMENT OF AGREEMENT. The Agreement shall be and the same
hereby is amended as follows:





LOAN MODIFICATION AGREEMENT AND
AMENDMENT TO LOAN DOCUMENTS -- 12/27/95                                   Page 1
<PAGE>   21
         (i)     Section 7.4 of the Agreement shall be deleted and replaced as
    follows:

                 "7.4 Reserved for Future Use."

         (ii)    Section 7.5 of the Agreement shall be deleted and replaced as
    follows:

                 "7.5 Reserved For Future Use."

         (iii)   Section 7.6 of the Agreement shall be deleted and replaced as
    follows:

                 "7.6 Reserved For Future Use."

         (iv)    Section 8.5 of the Agreement shall be deleted and replaced as
    follows:

                 "8.5 Reserved For Future Use."

         (v)     New Section 8.7 of the Agreement shall be inserted after
    existing Section 8.6 and read in its entirety as follows:

                 "8.7 The Borrower shall not cause, allow or suffer the Company
                 nor any Subsidiary of the Company to incur any Debt if after
                 giving effect thereto, the ratio of the Company's Consolidated
                 Debt to Total Capitalization would exceed fifty percent
                 (50%)."

         (vi)    New Section 8.8 of the Agreement shall be inserted thereafter
    and read in its entirety as follows: 

                 "8.8 The Borrower shall not cause, allow or suffer to occur at
                 any time the Company's Consolidated Net Worth to be less than
                 the sum of (a) Ninety Million Dollars ($90,000,000) plus (b)
                 an aggregate amount equal to fifty percent (50%) of
                 Consolidated Net Income (but, in each case, only if a positive
                 number) for each completed fiscal year of the Company
                 beginning with the fiscal year ending December 31, 1995."

         (vii) New Section 8.9 of the Agreement shall be inserted thereafter
    and read in its entirety as follows:

                 "8.9 The Borrower shall not cause, allow or suffer to occur at
                 any time (a) EBITDA for the period of four consecutive fiscal
                 quarters of the Company then most recently ended to be less
                 than (b) five hundred percent (500%) of Consolidated Interest
                 Expense for such period."

         (viii) New Section 8.10 shall be inserted thereafter and read in its
    entirety as follows:

                 "8.10 As used in Sections 8.7, 8.8 and 8.9, capitalized terms
                 shall have the meaning attributed to the same in Schedule B
                 hereto."





LOAN MODIFICATION AGREEMENT AND
AMENDMENT TO LOAN DOCUMENTS -- 12/27/95                                   Page 2
<PAGE>   22
         (ix)    By adding Schedule B hereto as Schedule B to the Agreement.

         2.      EFFECT ON LOAN DOCUMENTS. Each of the Loan Documents shall be
deemed amended as set forth hereinabove and to the extent necessary to carry
out the intent of this Agreement. Without limiting the generality of the
foregoing, each reference in the Loan Documents to the Agreement or any other
Loan Documents shall be deemed to be references to said documents, as amended
hereby. Except as is expressly set forth herein, all of the Loan Documents
shall remain in full force and effect in accordance with their respective terms
and shall continue to evidence, secure, guarantee or relate to, as the case may
be, the Term Loan.

         3.      REPRESENTATIONS AND WARRANTIES. Each representation and
warranty contained in the Loan Documents is hereby reaffirmed as of the date
hereof, and Borrower hereby represents that Borrower has no offsets or claims
against Bank arising under, related to, or connected with the Term Loan or any
of the Loan Documents.

         4.      ADDITIONAL DOCUMENTATION: EXPENSES. If Bank shall request,
Borrower shall provide to Bank certified copies of resolutions properly
authorizing the transactions contemplated hereby and the execution of this
Agreement, all other documents and instruments being executed in connection
herewith and all other documents and instruments required by Bank, all in form
and substance satisfactory to Bank. Borrower shall pay any recording fees and
all other expenses (including, without limitation, legal fees) incurred by Bank
and Borrower in connection with the modification of the Term Loan and any other
transactions contemplated hereby.

         5.      EXECUTION AND EFFECTIVENESS. This Agreement has been
negotiated, and is being executed and delivered, in the State of Alabama, or,
if executed elsewhere, shall become effective upon Bank's receipt and
acceptance of the original of this Agreement (or a facsimile thereof) in the
State of Alabama; provided, however, that Bank shall have no obligation to
give, nor shall Borrower be entitled to receive, any notice of such acceptance
for this Agreement to become a binding obligation of Borrower.





LOAN MODIFICATION AGREEMENT AND
AMENDMENT TO LOAN DOCUMENTS -- 12/27/95                                   Page 3
<PAGE>   23
         IN WITNESS WHEREOF, the undersigned have caused this instrument to be
duly executed effective as of the date first set forth above.

                                        BORROWER:
                                  
WITNESS:                                SEITEL GEOPHYSICAL, INC.
                                  
                                  
                                  
/s/ MARCIA H. KENDRICK                  By /s/ DEBRA D. VALICE
- ----------------------------------        ------------------------------------
                                        Its Vice President and Secretary 
                                            Treasurer
                                           -----------------------------------

                                  
                                        BANK:
                                  
WITNESS:                                COMPASS BANK
                                  
                                  
                                  
/s/ ANNE CHANDLER                       By /s/ JAY P. ACKLEY 
- ----------------------------------        ------------------------------------
                                        Its Assistant Vice President
                                           -----------------------------------
                                  


STATE OF TEXAS                    )
         -------------------------  
                                  :
COUNTY OF HARRIS                  )
          ------------------------  

         I, the undersigned, Notary Public in and for said County in said
State, hereby certify that Debra D. Valice whose name as Secretary/Treasurer of
SEITEL GEOPHYSICAL, INC., a corporation, is signed to the foregoing instrument
and who is known to me, acknowledged before me on this day that, being informed
of the contents of the instrument, _he, as such officer, and with full
authority, executed the same voluntarily for and as the act of said
corporation.

         Given under my hand this the 7th day of February 1996.



                                        
                                        /s/ JON R. FONTENOT
                                        ---------------------------------------
                                        Notary Public
[NOTARY SEAL]

                                        My Commission Expires: April 13, 1999
                                                               ----------------




LOAN MODIFICATION AGREEMENT AND
AMENDMENT TO LOAN DOCUMENTS -- 12/27/95                                   Page 4
<PAGE>   24
STATE OF Alabama       )
                       :
COUNTY OF Jefferson    )

         I, the undersigned, Notary Public in and for said County in said
State, hereby certify that Jay P. Ackley whose name as Assistant Vice President
of COMPASS BANK, an Alabama banking corporation, is signed to the foregoing
instrument and who is known to me, acknowledged before me on this day that,
being informed of the contents of the instrument, _he, as such officer, and
with full authority, executed the same voluntarily for and as the act of said
corporation.

         Given under my hand this the 13th day of February 1996.



                                       /s/ ANNE H. CHANDLER
                                       ---------------------------------------
                                       Notary Public
[NOTARY SEAL]                
                                       My Commission Expires: April 13, 1998
                                                             -----------------
                             




LOAN MODIFICATION AGREEMENT AND
AMENDMENT TO LOAN DOCUMENTS -- 12/27/95                                   Page 5
<PAGE>   25
                                   SCHEDULE B
                                 DEFINED TERMS

         As used in Sections 8.7, 8.8, and 8.9 of the Agreement, the following
terms have the respective set forth below:

         Bank -- means Compass Bank, an Alabama state banking corporation.

         Board of Directors -- means the Board of Directors of the Company.

         Borrower -- means Seitel Geophysical, Inc., a Delaware corporation.

         Capital Lease -- means a lease with respect to which the lessee is
required concurrently to recognize the acquisition of an asset and the
incurrence of a liability in accordance with GAAP.

         Capital Lease Obligation -- means, with respect to any Person and a
Capital Lease, the amount of the obligation of such Person as the lessee under
such Capital Lease which would, in accordance with GAAP, appear as a liability
on a balance sheet of such Person.

         Company -- means Seitel, Inc., a Delaware corporation and the parent
corporation of Borrower.

         Consolidated Debt -- means, as of any date of determination, the total
of all Debt of the Company and the Restricted Subsidiaries outstanding on such
date, after eliminating all offsetting debits and credits between the Company
and the Restricted Subsidiaries and all other items required to be eliminated
in the course of the preparation of consolidated financial statements of the
Company and the Restricted Subsidiaries in accordance with GAAP.

         Consolidated Interest Expense -- means, with respect to any period,
the sum (without duplication) of the following (in each case, eliminating all
offsetting debits and credits between the Company and the Restricted
Subsidiaries and all other items required to be eliminated in the course of the
preparation of consolidated financial statements of the Company and the
Restricted Subsidiaries in accordance with GAAP):

                 (a)      all interest in respect of Debt of the Company and
         the Restricted Subsidiaries (including imputed interest on Capital
         Lease Obligations) deducted in determining Consolidated Net Income for
         such period, and

                 (b)      all debt discount and expense amortized or required
         to be amortized in the determination of Consolidated Net Income for
         such period.

         Consolidated Net Income -- means, with reference to any period, the
net income (or loss) of the Company and the Restricted Subsidiaries for such
period (taken as a cumulative whole), as determined in accordance with GAAP,
after eliminating all offsetting debits and credits between the Company and the
Restricted Subsidiaries and all other items required to be eliminated in the
course of the preparation of consolidated financial statements of the Company
and the Restricted Subsidiaries in accordance with GAAP, provided, there shall
be excluded:





                                       1
<PAGE>   26
                 (a)      any gains resulting from any write-up of any assets
         (but not any loss resulting from any write-down of any assets),

                 (b)      the income (or loss) of any Person accrued prior to
         the date it becomes a Restricted Subsidiary or is merged into or
         consolidated with the Company or a Restricted Subsidiary, and the
         income (or loss) of any Person, substantially all of the assets of
         which have been acquired in any manner by the Company or any
         Restricted Subsidiary, realized by such other Person prior to the date
         of acquisition,

                 (c)      in the case of a successor to the Company by
         consolidation or merger or as a transferee of its assets, any earnings
         of the successor corporation prior to such consolidation, merger or
         transfer of assets,

                 (d)      any aggregate net gain (but not any aggregate net
         loss) during such period arising from the sale, conversion, exchange
         or other disposition of capital assets (such term to include, without
         limitation, (i) all non-current assets and, without duplication, (ii)
         the following, whether or not current: all fixed assets, whether
         tangible or intangible, all inventory sold in conjunction with the
         disposition of fixed assets, and all securities),

                 (e)      any portion of such net income that cannot be freely
         converted into United States Dollars,

                 (f)      the income (or loss) of any Person (other than a
         Restricted Subsidiary) in which the Company or any Restricted
         Subsidiary has an ownership interest, except to the extent that any
         such income has been actually received by the Company or such
         Restricted Subsidiary in the form of cash dividends or similar cash
         distributions,

                 (g)      any gain arising from the acquisition of any
         security, or the extinguishment, under GAAP, of any Debt of the
         Company or any Restricted Subsidiary,

                 (h)      any net income or gain or any net loss during such
         period from (i) any change in accounting principles in accordance with
         GAAP or (ii) any prior period adjustments resulting from any change in
         accounting principles in accordance with GAAP, and

                 (i)      any net income or gain (but not any net loss) during
         such period from (i) any extraordinary items or (ii) any discontinued
         operations or the disposition thereof.

         Consolidated Net Worth -- means, at any time, the total stockholders'
equity which would be shown in consolidated financial statements of the Company
and the Restricted Subsidiaries prepared at such time in accordance with GAAP.

         Debt -- means, with respect to any Person, without duplication

                 (a)      its obligations for borrowed money;

                 (b)      its obligations in respect of banker's acceptances,
         other acceptances, letters of credit and other instruments serving a
         similar function issued or accepted by banks and other





                                       2
<PAGE>   27
         financial institutions for the account of such Person (whether or not
         incurred in connection with the borrowing of money);

                 (c)      its obligations that are evidenced by bonds, notes,
         debentures or similar instruments;

                 (d)      its obligations for the deferred purchase price of
         property acquired by such Person (excluding accounts payable arising
         in the ordinary course of business but including, without limitation,
         all obligations created or arising under any conditional sale or other
         title retention agreement with respect to any such property);

                 (e)      its Capital Lease Obligations;

                 (f)      its obligations in respect of all mandatorily
         redeemable preferred stock of such Person;

                 (g)      its obligations for borrowed money secured by any
         Lien with respect to any property owned by such Person (whether or not
         it has assumed or otherwise become liable for such obligations); and

                 (h)      any Guaranty of such Person with respect to
         liabilities of a type described in any of clauses (a) through (g)
         hereof.

Debt of any Person shall include all obligations of such Person of the
character described in clauses (a) through (h) to the extent such Person
remains legally liable in respect thereof notwithstanding that any such
obligation is deemed to be extinguished under GAAP.

         EBITDA -- means, in respect of any period, Consolidated Net Income for
such period minus

                 (a)      to the extent added in the computation of such
         Consolidated Net Income, each of the following:

                          (i)     extraordinary gains net of extraordinary
                losses, and

                          (ii)    gains, net of losses, arising from the
                 disposition of property other than in the ordinary course of
                 business, plus

                 (b)      to the extent deducted in the computation of such
         Consolidated Net Income, each of the following:

                          (i)     Consolidated Interest Expense, net of
                 interest and other investment income,

                          (ii)    taxes imposed on or measured by income or
                 excess profits of the Company and the Restricted Subsidiaries,

                          (iii)   the amount of all depreciation, depletion and
                 amortization allowances and other non-cash expenses of the
                 Company and the Restricted Subsidiaries,





                                       3
<PAGE>   28
                          (iv)    extraordinary losses, net of extraordinary
                 gains, and
 
                          (v)     losses, net of gains, arising from the
                 disposition of property other than in the ordinary course of
                 business.

         Equity Interest -- means

                 (a)      the outstanding Voting Stock of a corporation or
         other business entity,

                 (b)      the interest in the capital or profits of a
         corporation, limited liability company, partnership or joint venture,
         or

                 (c)      the beneficial interest in a trust or estate.

         GAAP -- means accounting principles as promulgated from time to time
in statements, opinions and pronouncements by the American Institute of
Certified Public Accountants and the Financial Accounting Standards Board and
in such statements, options and pronouncements of such other entities with
respect to financial accounting of for-profit entities as shall be accepted by
a substantial segment of the accounting profession in the United States.

         Guaranty -- means, with respect to any Person, any obligation (except
the endorsement in the ordinary course of business of negotiable instruments
for deposit or collection) of such Person guaranteeing or in effect
guaranteeing any indebtedness, dividend or other obligation of any other Person
in any manner, whether directly or indirectly, including (without limitation)
obligations incurred through an agreement, contingent or otherwise, by such
Person:

                 (a)      to purchase such indebtedness or obligation or any
         property constituting security therefor;

                 (b)      to advance or supply funds (i) for the purchase or
         payment of such indebtedness or obligation, or (ii) to maintain any
         working capital or other balance sheet condition or any income
         statement condition of any other Person or otherwise to advance or
         make available funds for the purchase or payment of such indebtedness
         or obligation;

                 (c)      to lease properties or to purchase properties or
         services primarily for the purpose of assuring the owner of such
         indebtedness or obligation of the ability of any other Person to make
         payment of the indebtedness or obligation; or

                 (d)      otherwise to assure the owner of such indebtedness or
         obligation against loss in respect thereof.

In any computation of the indebtedness or other liabilities of the obliger
under any Guaranty, the indebtedness or other obligations that are the subject
of such Guaranty shall be assumed to be direct obligations of such obliger.

         Person -- means an individual, partnership, corporation, limited
liability company, association, trust, unincorporated organization, or a
government or agency or political subdivision thereof.





                                       4
<PAGE>   29
         Restricted Subsidiary -- means and includes each and every Subsidiary
other than any Subsidiary which, at the time of any determination hereunder,
has been designated by the Board of Directors and by written notice to the Bank
to be an Unrestricted Subsidiary; provided in any event, that each of the
following shall at all times constitute a Restricted Subsidiary:

                 (a)      each Subsidiary of the Company as of December 28,
         1995; and

                 (b)      each Subsidiary which owns, directly -or indirectly,
         more than fifty percent (demo) of the Equity Interest of a Restricted
         Subsidiary.

         Subsidiary -- means, as to any Person, any corporation, limited
liability company, partnership, joint venture, trust or estate in which such
Person or one or more of the Subsidiaries or such Person and one or more of the
Subsidiaries own more than fifty percent (judo) of the Equity Interest. Unless
the context otherwise clearly requires, any reference to a "Subsidiary" is a
reference to a Subsidiary of the Company.

         Total Capitalization -- means, at any time, the sum of Consolidated
Debt plus Consolidated Net Worth, in each case at such time.

         Unrestricted Subsidiary -- means each Subsidiary other than a
Restricted Subsidiary.

         Voting Stock -- shall mean the capital stock or similar interest of
any class or classes (however designated) of a corporation or other business
entity, the holders of which are ordinarily, in the absence of contingencies,
entitled to vote for the election of the members of the board of directors (or
Persons performing similar functions) of a corporation or other business
entity.





                                       5
<PAGE>   30


                   ASSUMPTION AND LOAN MODIFICATION AGREEMENT

         THIS ASSUMPTION AND LOAN MODIFICATION AGREEMENT (this "Agreement") is
entered into effective as of December 31, 1996 (this "Agreement") and is by and
among SEITEL GEOPHYSICAL, INC. a Delaware corporation ("Seitel"), EAGLE
GEOPHYSICAL, INC., a Delaware corporation ("Eagle"), COMPASS BANK (f/k/a
Central Bank of the South), an Alabama state banking corporation ("Compass"),
and SEITEL, INC., a Delaware corporation (the "Guarantor").

         All capitalized terms used herein but not otherwise defined herein
shall have the meaning set forth in that certain Term Credit and Security
Agreement dated as of July 15, 1993, together with any Schedules thereto, al as
amended (the "Loan Agreement") between Seitel and Compass.

                              W I T N E S S E T H:

         WHEREAS, Seitel and Compass are parties to the Loan Agreement.

         WHEREAS, the Guarantor has provided to Compass a guaranty of, inter
alia, all amounts due and payable by Seitel under the Loan Agreement, the Note
and all other Loan Documents pursuant to that certain Continuing Guaranty
(Unlimited) dated July 15, 1993 executed by Guarantor in favor of Compass, as
amended (the "Guaranty").

         WHEREAS, Seitel wishes to assign and delegate to Eagle all of its
right, title, interests and obligations in, to and under the Loan Agreement,
the Note, and the Loan Documents and Eagle wishes to accept such assignment and
delegation.

         WHEREAS, the parties hereto have entered into this Agreement to, among
other things, (a) acknowledge and consent to the assignment and delegation from
Seitel to Eagle on the terms and conditions hereinafter set forth and (b)
provide for the Guarantor to acknowledge its continuing obligations under the
Guaranty with respect to Eagle.

                               A G R E E M E N T

         NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:

         1.      Assignment, Assumption and Modification.  Seitel, in its
capacity as Borrower under the Loan Agreement, the Note and all the other Loan
Documents, hereby assigns and delegates to Eagle all of Seitel's rights, title,
interests and obligations in, to and under the Loan Agreement, the Note, and
the other Loan Documents pursuant to that certain Contribution and Assumption
Agreement effective as of December 31, 1996 (the "Contribution Agreement")
between Seitel and Eagle.  Eagle hereby accepts and agrees to perform such
assignment and delegation and acknowledges and agrees that from and after
December 31, 1996 (the "Effective Date") it shall be a party to and be the
"Borrower" for all purposes under the Loan Agreement, the Note, the Guaranty
and all the other Loan Documents executed in connection therewith and agrees to
be bound by all of the terms of, and to assume, undertake and perform all the
obligations and liabilities of, the Borrower as set forth therein whether such
obligations and liabilities arise prior to, on or after the Effective Date.
Without limiting the foregoing, the Loan Documents shall be and the same hereby
are amended by deleting any and all references to the name "Seitel Geophysical,
Inc." and substituting in place thereof the name "Eagle Geophysical, Inc."  The
Loan Documents also shall be and the same hereby are amended by deleting any
and all references to "Central Bank of the South" and substituting in place
thereof "Compass Bank".

         2.      Consent to Assignment.  Compass hereby, subject to the terms
of this Agreement, consents to the Contribution Agreement and the assignment
and delegation by Seitel to Eagle of all of Seitel's right, title, interests
<PAGE>   31
and obligations in, to and under the Loan Agreement, the Note and the other
Loan Documents.

         3.      Acknowledgement by Guarantor.  The Guarantor hereby
acknowledges and consents to the Contribution Agreement and this Agreement.
Further, the Guarantor agrees that the Guaranty from the Guarantor to Compass
guaranteeing all obligations of Seitel to Compass shall guarantee all
obligations of Eagle to Compass.  Without limiting the foregoing, (i) any and
all references in said Guaranty to "Seitel Geophysical, Inc." shall be and
hereby are amended to read and refer to "Eagle Geophysical, Inc." and (ii) any
and all references in said Guaranty to "Central Bank of the South" shall be and
hereby are amended to read and refer to "Compass Bank".

         4.      Absence of Defaults.  Eagle, as Borrower, and the Guarantor
hereby represent and warrant that as of the date hereof no default or event of
default currently exists and is continuing with respect to the Borrower or the
Guarantor under any of the Loan Documents.

         5.      Conditions Precedent.  Eagle, as Borrower, and Guarantor agree
to deliver to Compass the following items on or before the Effective Date, each
in form and substance satisfactory to Compass: (a) the Contribution Agreement
duly executed by the parties thereto; (b) this Agreement duly executed by the
parties hereto; (c) Good Standing Certificates from business; (d) a legal
opinion of counsel to Eagle and the Guarantor in form and substance
satisfactory to Compass; and (e) such other certificates, financing statements,
resolutions and opinions as deemed necessary or advisable by Compass.

         6.      Counterparts.  This Agreement may be executed in any number of
counterparts, each of which when executed and delivered shall be deemed to be
an original and it shall not be necessary in making proof of this Agreement to
produce or account for more than one such counterpart.

        7.       Effect on Loan Documents.  Each of the Loan Documents shall be
deemed amended set forth hereinabove and to the extent necessary to carry out
the intent of this Agreement.  Without limiting the generality of the
foregoing, each reference in the Loan Documents to the Note, the Guaranty or
any other Loan Documents shall be deemed to be references to said documents, as
heretofore and hereby amended.  Except as is expressly set forth herein, all of
the Loan Documents shall remain in full force and effect in accordance with
their respective terms and shall continue to evidence, secure, guarantee or
relate to, as the case may be, the Term Loan.

         8.      Representations, Warranties, Covenants, etc.  Each
representation, warranty, covenant, grant of security interest and other
agreement originally made by Seitel and contained or referenced in the Loan
Documents is hereby expressly affirmed, adopted, stated and ratified and agreed
to by Eagle, and incorporated herein by reference, as if fully set forth
herein.  Seitel, Eagle and Guarantor hereby represent that neither Seitel,
Eagle nor Guarantor has any offsets or claims against Compass arising under,
related to, or connected with the Term Loan, the Loan Agreement, the Guaranty
or any of the other Loan Documents.

         9.      Expenses.  Eagle shall pay any recording fees and all other
expenses incurred by Compass in connection with this Agreement and any other
transactions contemplated hereby, including, without limitation, legal
expenses, filing fees and taxes.

         10.     Execution by Guarantor.  Guarantor has executed this Agreement
to evidence its consent to the modification, amendments and other matters
described herein, and to acknowledge the continuing effect of its Guaranty and
the obligations contained therein.

         11.     Governing Law.  This Agreement shall be governed by, and
construed in accordance with, the laws of the State of Alabama.

         12.     Continuation of Lien and Security Interest.  It is expressly
acknowledged and agreed that Eagle is taking the Assets (as defined in the
Contribution Agreement) subject to all liens and security interests of Compass






<PAGE>   32
in such Assets and nothing contained or implied herein shall be deemed to be,
constitute or result in the release of any such liens and security interests.

         IN WITNESS WHEREOF, each of the parties hereto has caused this
Agreement to be duly executed and delivered as of the Effective Date.


                                        SEITEL GEOPHYSICAL, INC.
                                        
                                        
                                        By:/s/ Jay N. Silverman
                                        Name: Jay N. Silverman
                                        Title:President
                                        
                                        
                                        
                                        EAGLE GEOPHYSICAL, INC.
                                        
                                        
                                        By:/s/ Jay N. Silverman
                                        Name: Jay N. Silverman
                                        Title: President
                                        
                                        
                                        
ACKNOWLEDGED, AGREED AND CONSENTED TO:


SEITEL, INC.


By:/s/ Paul A. Frame
Name: Paul A. Frame
Title:President



COMPASS BANK


By: /s/ Jay  P. Ackley
Name: Jay P. Ackley
Title: Asst. Vice President





<PAGE>   33
                                   TERM NOTE

$4,300,000                                                         July 15, 1993
                                                                         Alabama

         FOR VALUE RECEIVED, the undersigned SEITEL GEOPHYSICAL, INC., a
Delaware corporation ("Borrower"), hereby promises to pay to the order of
CENTRAL BANK OF THE SOUTH ("Bank"; Bank and any subsequent holder hereof being
hereinafter referred to as "Holder"), without grace at its office at 15 South
20th Street, Birmingham, Alabama  35233, or such other place as Holder may
direct, in lawful money of the United States of America, with interest, charges
and expenses, the principal amount of FOUR MILLION THREE HUNDRED THOUSAND AND
NO/1OO DOLLARS ($4,300,000). Payment of principal, interest, charges and
expenses shall be in accordance with the following provisions:

         1.      Payments.        Borrower promises to pay (i) monthly
principal and interest installment payments of $86,388.12 each on the first
(1st) day of each month beginning August 1, 1993; and (ii) a final payment of
all outstanding principal, accrued and unpaid interest and all related charges
and expenses hereunder on June 1, 1998, unless due sooner pursuant to the terms
of this Term Note or any of the Security Documents (defined below).  In the
event Borrower tenders or otherwise desires to make principal reduction
pre-payments with good and immediately available funds, Bank will accept such
pre-payments and apply the same against the principal balance outstanding
hereunder, without penalty.

         2.      Interest.        Except for purposes of calculating the
Highest Lawful Rate (defined  below), interest shall be calculated on the basis
of a 360-day year applied to the actual number of days upon which principal is
outstanding by multiplying the principal amount outstanding by the applicable
interest rate, multiplying the product thereof by the actual number of days
elapsed, and dividing the product so obtained by 360.  The applicable interest
rate is and shall be equal to 7.61%; provided, however, that in no event shall
the interest rate contracted for, taken, reserved, charged or received under
this Promissory Note be greater than the Highest Lawful Rate at any time.
Adjustments due to changes in the Highest Lawful Rate will be made on the
effective date of any change in the Highest Lawful Rate.  Unless changed in
accordance with law, the applicable method of calculating the usury ceiling
rate under Texas law (if and to the extent the same shall be deemed applicable
notwithstanding Section 7 below) shall be the indicated (weekly) ceiling rate
from time to time in effect, as provided in Tex. Rev. Civ. Stat. Ann. art.
5069-1.04, as amended, unless changed in accordance with law.

         It is the intention of Holder and Borrower to conform strictly to any
applicable usury laws (including, without limitation the laws of Texas and the
United States if and to the extent such laws, other than Alabama laws, are
deemed applicable notwithstanding Section 7 below).  Accordingly, if the
transactions contemplated hereby would be usurious under any applicable law,
then, in that event, notwithstanding anything to the contrary in this Term
Note, the Security Documents, or any other agreement or instrument entered into
in connection with or as security for or guaranteeing payment of the
indebtedness evidenced by this Term Note, it is agreed as  follows:  (i) the
aggregate of all consideration which constitutes interest under applicable law
that is  contracted  for,  taken, reserved, charged, or received by Holder
under this Term Note, the Security Documents or under any other agreement or
instrument entered into in connection with or as security for or guaranteeing
payment of the indebtedness evidenced by this Term Note shall under no
circumstances exceed the Highest Lawful Rate, and any excess shall be canceled
automatically and, if theretofore paid, shall, at the option of Holder, be
credited by Holder on the principal amount of any indebtedness owed to Holder
by Borrower or refunded by Holder to Borrower, and  (ii) in the event that the
payment of the indebtedness evidenced by this Term Note or any of the other
Liabilities (as defined in the Term Agreement (defined below)) is accelerated
or in the event of any  required or permitted pre-payment, then such
consideration that constitutes interest under law applicable to Holder may
never include more





                                       1

                                                                   Initials: /s/
<PAGE>   34
than the Highest Lawful Rate and excess interest, if any, to Holder, provided
for in this Term Note, the Security Documents or otherwise shall be canceled
automatically as of the date of such acceleration or pre-payment and, if
theretofore paid, shall, at the option of Holder, be credited by Holder on the
principal amount of any indebtedness owed to Holder by Borrower or refunded by
Holder to Borrower.

         "Highest Lawful Rate" means the maximum non-usurious interest rate
(computed on the basis of a year of 365 or 366 days, as applicable) that at any
time or from time to time may be contracted for, taken, reserved, charged, or
received on amounts due to Holder, under laws applicable to Holder with regard
to this Term Note that are presently in effect or, to the extent allowed by
law, under such applicable laws that allow a higher maximum non-usurious rate
than applicable laws now allow.

         Any principal amounts outstanding hereunder shall continue to bear
interest at the rates set forth herein after maturity.

         3.      Security Documents.       The indebtedness evidenced hereby is
secured by the following, along with other documents (the "Security
Documents"):

                 (a)      Term Credit and Security Agreement executed by
         Borrower on or about the date hereof, and all collateral and security
         referred to therein (the "Term Agreement");

                 (b)      Continuing (Unlimited) Guaranty executed by Seitel,
         Inc. ("Guarantor"); and

                 (c)      Revolving Credit and Security Agreement executed by
         Guarantor on or about the date hereof, and all collateral and security
         referenced to therein.

         This Term Note is included in the indebtedness referred to in the
Security Documents and is entitled to the benefits of those documents, but
neither this reference to those documents nor any provisions thereof shall
affect or impair the absolute and unconditional obligation of Borrower to pay
the principal of, interest on, and charges and expenses related to this Term
Note as and when due.

         4.      Events of Default.        In case of the happening of any one
or more of the following events of default:

                 (a)      Default in the payment of the principal of, interest
         on, or charges and expenses related to this Term Note, as and when
         due;

                 (b)      Failure by Borrower or Guarantor to pay or perform
         any other loan, indebtedness, liability or obligation to as and when
         due;

                 (c)      Failure by Borrower or Guarantor or any other person
         or entity to observe or comply with any covenant, obligation or
         provision contained or referenced in this Term Note or in any of the
         Security Documents or in any other document, agreement or instrument
         executed in connection with or securing this Term Note (which failure
         continues beyond any applicable cure period agreed upon by Bank in the
         Security Documents or otherwise in writing); or

                 (d)      The occurrence or continuation of any default or
         event of default contained, specified or referenced in any of the
         Security Documents or in any other document, agreement or instrument
         executed in connection with or securing this Term Note (which is not
         cured within any applicable cure period agreed upon by Bank in the
         Security Documents or otherwise in writing); then, or at any time
         thereafter, Holder may, with or without notice to Borrower, declare
         this Term Note to be forthwith due and payable, as to principal and
         interest and related charges and expenses, without presentment,
         demand, protest, notice of





                                       2

                                                                   Initials: /s/
<PAGE>   35
         intent to accelerate, notice of acceleration, or other notice of any
         kind, all of which are hereby expressly waived, anything contained
         herein or in any of the Security Documents or in any other instrument
         executed in connection with or securing this Term Note to the contrary
         notwithstanding.

         5.      Waivers.         Borrower and any endorser or guarantor hereof
hereby waive demand, presentment for payment, notice of dishonor, protest,
notice of protest, notice of intent to accelerate, notice of acceleration, and
diligence in collection or bringing suit and agree that Holder may accept
partial payment, or release or exchange security or collateral, without
discharging or releasing any unreleased collateral or the obligations evidenced
hereby.  To the extent permitted by applicable law, Borrower further waives any
and all rights of exemption, both  as to personal and real property, under the
constitution or laws of the United States, the State of Alabama, or any  other
state or jurisdiction.

         6.      Attorneys' Fees and Costs.        Borrower agrees to pay
reasonable attorneys' fees and costs incurred by Holder in collecting or
attempting to collect this Term Note, whether by suit or otherwise.

         7.      Applicable Law: Assigns.  THIS TERM NOTE AND ALL RIGHTS AND
OBLIGATIONS HEREUNDER, INCLUDING MATTERS OF CONSTRUCTION, VALIDITY AND
PERFORMANCE, SHALL BE GOVERNED AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE
STATE OF ALABAMA, EXCEPT THAT ANY CONFLICT OF LAWS RULE OF SUCH JURISDICTION
THAT WOULD REQUIRE REFERENCE TO THE LAWS OF SOME OTHER JURISDICTION SHALL BE
DISREGARDED.  ANY SUITS, CLAIMS OR CAUSES OF ACTION ARISING DIRECTLY OR
INDIRECTLY FROM THIS TERM NOTE, THE SECURITY DOCUMENTS OR ANY OTHER AGREEMENTS
OR INSTRUMENTS BETWEEN BANK AND BORROWER RELATING TO SUCH DOCUMENTS SHALL BE
BROUGHT IN A COURT OF APPROPRIATE JURISDICTION ONLY IN JEFFERSON COUNTY,
ALABAMA AND OBJECTIONS TO VENUE AND PERSONAL JURISDICTION IN SUCH FORUM ARE
HEREBY EXPRESSLY WAIVED.  BORROWER AGREES THAT THIS TERM NOTE AND ALL OTHER
AGREEMENTS, INSTRUMENTS AND DOCUMENTS REFERRED TO HEREIN SHALL BE GOVERNED BY
AND CONSTRUED UNDER THE LAWS OF THE STATE OF ALABAMA (WITHOUT REGARD TO CHOICE
OF LAW CONSIDERATIONS), INCLUDING, WITHOUT LIMITATION, APPLICABLE USURY LAWS.
THIS TERM NOTE HAS BEEN NEGOTIATED, AND IS BEING EXECUTED AND DELIVERED IN THE
STATE OF ALABAMA, OR, IF EXECUTED ELSEWHERE, SHALL BECOME EFFECTIVE UPON BANK'S
RECEIPT AND ACCEPTANCE OF THE EXECUTED ORIGINAL OF THIS TERM NOTE IN THE STATE
OF ALABAMA; PROVIDED, HOWEVER, THAT BANK SHALL HAVE NO OBLIGATION TO GIVE, NOR
SHALL BORROWER BE ENTITLED TO RECEIVE, ANY NOTICE OF SUCH ACCEPTANCE FOR THIS
TERM NOTE TO BECOME A BINDING OBLIGATION OF BORROWER.  IT IS INTENDED, AND
BORROWER AND BANK SPECIFICALLY AGREE, THAT THE LAWS OF THE STATE OF ALABAMA
GOVERNING INTEREST SHALL APPLY TO THIS TERM NOTE AND THIS TRANSACTION.
BORROWER HEREBY ACKNOWLEDGES THAT (I) THE NEGOTIATION, EXECUTION, AND DELIVERY
OF THIS TERM NOTE AND THE SECURITY DOCUMENTS CONSTITUTES THE TRANSACTION OF
BUSINESS WITHIN THE STATE OF ALABAMA; (II) ANY CAUSE OF ACTION ARISING UNDER
THIS TERM NOTE AND/OR ANY OF THE SECURITY DOCUMENTS WILL BE A CAUSE OF ACTION
ARISING FROM SUCH TRANSACTION OF BUSINESS; AND (III) BORROWER UNDERSTANDS,
ANTICIPATES AND FORESEES THAT ANY ACTION FOR ENFORCEMENT OF THIS TERM NOTE
AND/OR ANY OF THE SECURITY DOCUMENTS MAY BE BROUGHT AGAINST BORROWER, ET AL.,
IN THE STATE OF ALABAMA.  TO THE EXTENT ALLOWED  BY LAW, BORROWER HEREBY
SUBMITS TO JURISDICTION IN THE STATE OF ALABAMA FOR ANY  ACTION OR CAUSE OF
ACTION ARISING OUT OF OR IN CONNECTION WITH THIS TERM NOTE AND/OR ANY OF THE
SECURITY DOCUMENTS AND HEREBY WAIVES ANY AND ALL RIGHTS  UNDER THE LAWS OF ANY
STATE OR JURISDICTION TO OBJECT TO JURISDICTION OR VENUE WITHIN JEFFERSON
COUNTY, ALABAMA.  NOTWITHSTANDING THE FOREGOING, NOTHING CONTAINED IN THIS
PARAGRAPH SHALL PREVENT BANK FROM BRINGING ANY ACTION OR





                                       3

                                                                   Initials: /s/
<PAGE>   36
EXERCISING ANY RIGHTS AGAINST BORROWER, ANY GUARANTOR, ANY SECURITY FOR THIS
TERM NOTE OR ANY OF BORROWER'S OR ANY GUARANTOR'S PROPERTIES IN ANY OTHER
COUNTY, STATE  OR  JURISDICTION.  INITIATING SUCH ACTION OR PROCEEDING OR
TAKING ANY SUCH ACTION IN ANY OTHER STATE OR JURISDICTION SHALL IN NO EVENT
CONSTITUTE A WAIVER BY BANK OF ANY OF THE FOREGOING.  As used herein, the terms
"Borrower", "Bank", "Guarantor" and "Holder" shall be deemed to include their
respective successors, legal representatives and assigns,  whether by voluntary
action of the parties or by operation of law.  This Term Note is  given  under
the  seal  of  all parties hereto and it is intended that this Term Note shall
constitute and have the effect of a sealed instrument according to law.

         IN  WITNESS  WHEREOF, Borrower has caused this Term Note to be
executed and delivered by its duly authorized officer in Alabama on this the
15th day of July, 1993.

                                          BORROWER:

                                          
WITNESS:                                  SEITEL GEOPHYSICAL, INC.
                                          
                                          /s/ Debra D. Valice
                                          
By:  /s/ [illegible signature]            By: Debra D. Valice
   ----------------------------------         Secretary/Treasurer
                                          
                                          
                                          
                                          
                                          
STATE OF ALABAMA                          
                                          
COUNTY OF JEFFERSON


         I, the undersigned, Notary Public in and for, said County in said
State, hereby certify that Debra D. Valice, whose name as Secretary/Treasurer
of SEITEL GEOPHYSICAL, INC., a Delaware corporation, is signed to the foregoing
instrument and who is known to me, acknowledged before me on this day that,
being informed of the  contents of the instrument she, as such officer and with
full authority, executed the same voluntarily for and as the act of said
corporation.

          Given under my hand this 15th day of July, 1993.


                                          /s/                               
                                       ----------------------------------------
                                       Notary Public
                                       My Commission Expires:  4-18-94
[NOTARIAL SEAL]





                                       4

                                                                   Initials: /s/
<PAGE>   37

     CENTRAL BANK OF THE SOUTH P.O. BOX 10566 BIRMINGHAM, ALABAMA 35296

                            SIDE LETTER AGREEMENT
        
                                July 15, 1993


Ms. Debra Valice
Seitel, Inc.
Seitel Geophysical, Inc.
50 Briar Hollow Lane
7th Floor West
Houston, Texas 77027

Dear Ms. Valice:

Reference is made to that certain Revolving Credit and Security Agreement (the
"Revolving Agreement") and that certain Master Revolving Promissory Note (the
"Revolving Note") executed by Seitel, Inc. (the "Borrower") on or about the
date hereof in connection with Borrower's $10,000,000 revolving line of credit
(the "Revolving Line") and that certain Term Credit and Security Agreement (the
"Term Agreement") and that certain Term Note (the "Term Note") executed by
Seitel Geophysical, Inc. ("Related Borrower") on or about the date hereof in
connection with Related Borrower's $4,300,000 term loan (the "Term Loan").
Notwithstanding anything to the contrary contained or implied in the Revolving
Agreement, the Term Agreement, the Revolving Note and/or the Term Note
(collectively with all other documents executed in connection therewith, the
"Loan Documents"), Central Bank of the South (the "Bank") agrees as follows:  

        Subject to and conditioned upon (i) Related Borrower paying in full (in
       good and immediately available funds) all interest, charges, principal
       and expenses outstanding under and in connection with the Term Loan,
       (ii) the non-existence of any default or event of default under the
       Revolving Agreement or the Revolving Note, (iii) Bank not having any
       obligation to advance any funds to or on behalf of Related Borrower and
       (iv) Related Borrower not having any Liabilities (as defined in the Term
       Agreement) to Bank under the Term Agreement, the Bank agrees upon the
       written request of Related Borrower (and receipt by Bank of such
       certifications as Bank shall request concerning satisfaction of the
       foregoing conditions) to then release its security interest in Related
       Borrower's accounts, general intangibles, inventory and equipment (the
       "Release") and terminate the Term Agreement (the "Termination"),
       provided that (a) Borrower and Related Borrower shall pay to Bank any
       and all expenses (including legal expenses), costs, taxes, filing fees,
       and other costs and expenses associated or incurred by Bank in
       connection with said Release and Termination and (b) Borrower and
       Related Borrower shall (at Borrower's and Related Borrower's expense)
       execute and deliver to Bank all such other documents, instruments and
       agreements (in form and substance satisfactory to Bank) as may be
       reasonably requested by Bank to effectuate the foregoing; provided,
       however, that if Bank ever is required to repay or disgorge any payment

<PAGE>   38


       received under or in connection with the Term Loan ("Disgorged
       Payment"), the Release and Termination shall be voided and the Term
       Agreement and all of Bank's rights, remedies and interests shall be
       reinstated in full as the same existed prior to the Bank's receiving the
       Disgorged Payment without any loss of lien or priority.  


                                        CENTRAL BANK OF THE SOUTH


                                        By: /s/ Terry W. Gasken
                                        Its: Vice President


Acknowledged and agreed: 

SEITEL, INC.


By: /s/ Debra D. Valice
Its: Vice President - Finance




SEITEL GEOPHYSICAL, INC. 


By: /s/ Debra D. Valice
Its: Secretary/Treasurer

<PAGE>   1
                                                                          10.9.1





                     BAREBOAT CHARTER BY WAY OF SUB-DEMISE


                           SIMON-HORIZON LIMITED (1)

                                    - and -

                        HORIZON EXPLORATION LIMITED (2)





Simmons & Simmons
14 Dominion Street
London EC2M 2RJ
5A/P37800/AZM/1040m
<PAGE>   2
                                     INDEX

<TABLE>
<CAPTION>
Clause               Heading                                                Page
- ------               -------                                                ----
<S>    <C>                                                                   <C>
1      Definitions                                                             1

2      Representations and Warranties                                          9

3      Term of Charter                                                        12

4      Conditions Precedent                                                   15

5      Delivery and Acceptance                                                15

6      Extent of Simon's Liability; Third Party Warranties                    16

7      Charterhire                                                            17

8      Payments, Interest and Calculations                                    18

9      Costs and Indemnities                                                  19

10     Taxation                                                               22

11     General Undertakings                                                   24

       11.1

              (a)    Notification of Relevant Event
              (b)    Consents and Authorisations
              (c)    Preparation of Accounts
              (d)    Supply of Accounts
              (e)    Information concerning the Charterer
              (f)    Information concerning the Ship
              (g)    Observance of Covenants

       11.2   Protection of Owner's and Simon's Rights

              (a)    Disposal of the Ship
              (b)    Encumbrances
              (c)    Notification of Arrest
              (d)    Prevention of and Release from Arrest
              (e)    No pledging of Simon's or Owner's Credit
              (f)    Protection of Simon's and the Owner's Rights in the Ship
</TABLE>





                                      (i)
<PAGE>   3
<TABLE>
<S>    <C>                                                                   <C>
              (g)    Notice of Owner's and Simon's Rights
              (h)    Release from Arrest: Owner's and Simon's Vessels

12     Sub Chartering                                                         28

13     Use and Trade of the Ship                                              28

       13.1   Permitted Use
       13.2

              (a)    Ship's Registration
              (b)    Employment
              (c)    Payment of Outgoing and Evidence of Payments
              (d)    Operation in the U.S.A. or Canada
              (e)    Use for Qualifying Purpose
              (f)    Bills of Lading

14     Title, Registration, Name and House Flag                               30

       14.1   Title
       14.2   Initial Registration
       14.3   Transfer of Flag or Registry
       14.4   Name and House Flag

15     Maintenance and Operation                                              32

       15.1   Possession and Control of Ship by Charterer
       15.2   Undertakings concerning Maintenance and Operation

              (a)    Maintenance of Classification; Compliance with Regulations
              (b)    Supply and Crewing
              (c)    Surveys
              (d)    Repair
              (e)    Drydocking
              (f)    Inspection of the Ship
              (g)    Manuals and Technical Records
              (h)    Modification; Removal of Parts; Equipment owned by Third
                     Parties
              (i)    Manager
              (j)    Notification of certain Events
              (k)    Repairers' Liens
              (l)    Health and Safety
              (m)    No Operational Interest
              (n)    Safe Operation
              (o)    Fitness to go to Sea
</TABLE>





                                      (ii)
<PAGE>   4
<TABLE>
<S>    <C>                                                                   <C>
16     Insurance Undertakings; Wreck Removal and Insurance Assignment         37

       16.1   Insurance

              (a)    Insured Risks
              (b)    Brokers and Insurers
              (c)    Fleet Cover
              (d)    Payment of Premiums
              (e)    Renewal
              (f)    Guarantees
              (g)    Custody of Policy Documents; Letters of Undertaking; Loss
                     Payable Clauses
              (h)    Club Letters of Undertaking; Certificates of Entry
              (i)    Broker's Report
              (j)    Collection
              (k)    Compliance with Insurances
              (l)    Application of Recoveries
              (m)    Other Insurances and Assureds
              (n)    Information concerning Insurances

       16.2   Wreck Removal
       16.3   Further Requirements
       16.4   Insurance Assignment

17     Powers of Simon and/or the Owner to Remedy Defaults                    42

       17.1   Failure to Perform Insurance Undertakings
       17.2   Failure to Perform Maintenance Undertakings
       17.3   Failure to Prevent or Release from Arrest
       17.4   Failure to comply with other Obligations
       17.5   Costs of Remedying Defaults
       17.6   Hire Still Payable

18     Redelivery                                                             43

       18.1   Redelivery Procedure and Condition
       18.2   Redelivery Survey

19     Consumable Stores                                                      44

       19.1   Upon Delivery
       19.2   Upon Redelivery
</TABLE>





                                     (iii)
<PAGE>   5
<TABLE>
<S>    <C>                                                                   <C>
20     Use of Equipment and Replacement                                       44

       20.1   Use of Equipment and Manuals and Technical Records
       20.2   Renewal of Equipment
       20.3   Alteration of Equipment; Additional Equipment

21     Loss and Damage                                                        46

22     Salvage                                                                49

23     Requisition                                                            49

24     Termination Events                                                     50

25     Simon's Rights Following a Termination Event                           54

26     Increased Costs, Funding Problems and Illegality                       56

27     Notices                                                                56

28     Assignment                                                             58

29     Miscellaneous                                                          58

30     Law                                                                    59

Schedule

1      List of Documents and Evidence                                         60

2      Excluded Equipment, Retained Equipment and Additional Equipment        62

3      Charterhire                                                            63

4      Termination Sum                                                        81

5      Forms of Loss Payable Clauses                                          86

6      Payment of Charterhire                                                 87
</TABLE>





                                      (iv)
<PAGE>   6
A CHARTERPARTY BY WAY OF SUB-DEMISE dated 15 July, 1994, and made

BETWEEN:

(1)    SIMON-HORIZON LIMITED registered no. 467924 whose registered office is
       at Horizon House, Azalea Drive, Swanley, Kent BR8 8JR ("Simon"); and

(2)    HORIZON EXPLORATION LIMITED registered no. 2804983 of 6 Pembroke Road,
       Sevenoaks, Kent TN13 1XR (the "Charterer")

BY WHICH IT IS AGREED as follows:

1 Definitions

1.1    In this Charterparty, unless the context otherwise requires:

       "Additional Equipment" means the equipment so defined in and for the
       purposes of Clause 3.2.1(a) of the Agreement and which (to the extent
       the same has been identified at the date hereof) is referred in Part III
       of Schedule 2;

       "Agreement" means the agreement of even date herewith between Simon and
       the Charterer pursuant to which Simon has agreed, inter alia, to enter
       into this Charterparty, certain sub-lease contracts and other
       transactions relating to the Ship;

       "Approved Brokers" means such firm of insurance brokers, appointed by
       the Charterer, as may from time to time be approved in writing by or on
       behalf of Simon for the purposes of this Charterparty;

       "Assignment Agreement" means the agreement so defined in and for the
       purposes of the Agreement;

       "Banking Day" means a day (other than a Saturday) on which banks are
       open for business in London and Edinburgh;

       "BFE" means the equipment, machinery and parts supplied by Simon to the
       Owner pursuant to the Conversion and Supply Agreement;

       "CAA" means the Capital Allowances Act 1990;

       "Casualty Amount" means Two hundred and fifty thousand Pounds
       (L.250,000) (or the equivalent in any other currency);





                                       1
<PAGE>   7
       "Charterhire Payment Dates" means, subject to Clause 8.2, in relation to
       the Primary Period, each of the dates referred to in paragraph 2.2 of
       Schedule 3 and, in relation to the Secondary Period, means each of the
       dates referred to in paragraph 6.2 of Schedule 3;

       "Charter Period" means the period during which the Charterer shall be
       entitled to the possession and use of the Ship in accordance with this
       Charterparty;

       "Charterer" means Horizon Exploration Limited of 6 Pembroke Road,
       Sevens, Kent TN13 1XR and includes its successors and permitted
       assignees and transferees;

       "Classification" means "DNV + Al (MV), EO, SF, Supply Vessel, Helidecke"
       with the Classification Society or such other classification as the
       Owner and Simon shall, at the request of the Charterer, have agreed in
       writing shall be treated as the Classification for the purposes of this
       Charterparty;

       "Classification Society" means Det Norske Veritas or such other
       classification society which the Owner and Simon shall at the request of
       the Charterer, have agreed in writing shall be treated as the
       Classification Society for the purposes of this Charterparty;

       "Compulsory Acquisition" means requisition of title or other compulsory
       acquisition, requisition, appropriation, expropriation, deprivation or
       confiscation for any reason of the Ship by any Government Entity or
       other competent authority, whether de jure or de facto, but shall
       exclude requisition for use or hire not involving requisition of title;

       "Conversion and Supply Agreement" means the agreement dated 20th
       December 1990 between the Owner and Simon with regard to the Ship and
       relating to certain conversion works carried out to the Ship and the
       purchase of certain equipment installed thereon;

       "Conversion and Supply Price" means the aggregate amount in Pounds of
       the payments made to Simon pursuant to certificates presented under
       Clauses 2.5 and 3.4 of the Conversion and Supply Agreement;

       "Corporation Tax" means corporation tax in the context of the scheme of
       taxation contained in the United Kingdom Tax Acts (as defined in section
       831 ICTA) and any applicable Finance Act or any other tax on companies
       imposed in the United Kingdom in substitution for corporation tax;

       "Deed of Assignment" means the deed so defined under and for the
       purposes of the Agreement;

       "Delivery" means the time specified in the Protocol of Delivery and
       Acceptance in respect of the Ship signed by the Charterer and Simon
       pursuant to Clause 7 of the Agreement;





                                       2
<PAGE>   8
       "Delivery Date" means the date specified in the Protocol of Delivery and
       Acceptance in respect of the Ship aforesaid;

       "Encumbrance" means any mortgage, charge (whether fixed or floating),
       pledge, lien, hypothecation, assignment, security interest, title
       retention or other encumbrance of any kind securing, or any right
       conferring a priority of payment in respect of, any obligation of any
       person;

       "Excluded Equipment" means the equipment machinery and parts owned by or
       leased to Simon listed in Part I of Schedule 2 which although installed
       by Simon on the Ship by the Delivery Date are not chartered by the Owner
       to Simon pursuant to the Simon Charterparty;

       "Goods" means any goods the subject of the Goods Contracts;

       "Goods Contracts" means the Master Lease and any other contract or
       guarantee between Simon and the Charterer relating to the Goods;

       "Government Entity" means and includes (whether having a distinct legal
       personality or not) any national or local government authority, board,
       commission, department, division, organ, instrumentality, court or
       agency and any association, organisation or institution of which any of
       the foregoing is a member or to whose jurisdiction any of the foregoing
       is subject or in whose activities any of the foregoing is a participant;

       "Guarantees" means the guarantees issued or, as the context may require,
       to be issued by the Guarantors in favor of Simon;

       "Guarantors" means Horizon Seismic Inc., Exploration Holdings Limited,
       HEL and each of their subsidiaries from time to time;

       "ICTA" means the Income and Corporation Taxes Act 1988;

       "Indebtedness" means any obligation for the payment or repayment of
       money, whether as principal or as surety, and whether present or future,
       actual or contingent;

       "Insurances" means all policies and contracts of insurance (which
       expression includes all entries of the Ship in a protection and
       indemnity or war risks association) which are from time to time during
       the Charter Period in place or taken out or entered into by the
       Charterer pursuant to Clause 16 for the benefit of itself, Simon and the
       Owner in respect of the Ship or otherwise howsoever in connection with
       the Ship and all benefits thereof (including claims of whatsoever nature
       and return of premiums);

       "Loss Payable Clauses" means the provisions regulating the manner of
       payment of sums receivable under the Insurances which are to be
       incorporated in the relevant insurance





                                       3
<PAGE>   9
       documents, such Loss Payable Clauses to be in the forms set out in
       Schedule 5 or in such other forms as may from time to time be agreed in
       writing by Simon and the Owner;

       "Manager" means Ervik Marine Services A/S of Brunholmgt 2, N6004
       Aalesund, Norway or any other person appointed by the Charterer, with
       the prior written consent of Simon and the Owner, as the manager of the
       Ship;

       "Management Agreement" means the agreement (as the same may be amended,
       supplemented and/or novated from time to time) approved by the Owner
       dated 19th December, 1990 and made between Simon and the Manager or any
       other agreement, previously agreed in writing by Simon and the Owner,
       between the Charterer and the Manager providing (inter alia) for the
       Manager to manage the Ship;

       "Manuals and Technical Records" means all such books, records, logs,
       manuals, technical data, drawings and other materials and documents
       (whether kept or to be kept in compliance with any applicable laws or
       the requirements of the Classification Society or otherwise) relating to
       the Ship;

       "Master Leases" means the master lease of even date herewith between
       Simon and the Charterer and the sub lease contracts entered into
       pursuant thereto;

       "month" means a period beginning in one calendar month and ending in the
       next calendar month on the day numerically corresponding to the day of
       the calendar month on which it started, provided that (i) if the period
       started on the last Banking Day in a calendar month or if there is no
       such numerically corresponding day, it shall end on the last Banking Day
       in such next calendar month and (ii) if such numerically corresponding
       day is not a Banking Day, the period shall end on the preceding Banking
       Day and "months" and "monthly" shall be construed accordingly;

       "MWB Conversion Contract" means the agreement dated 18th October, 1990
       and made between Simon and the Yard relating to certain conversion works
       carried out and for the supply of certain equipment, to the Ship;

       "Net Sale Proceeds" means, in relation to a sale of the Ship, the amount
       actually received by the Owner from a purchaser of the Ship after
       deducting the Owner's expenses in connection with such sale including
       without limitation (where applicable) broker's commissions, Owner's
       marketing expenses, legal costs, agency fees and port charges, insurance
       premiums, stamp duties, registration fees and any expenses relating to
       the overhaul or repair of the Ship (including putting the Ship in class)
       incurred to restore the Ship to the condition required by this
       Charterparty and the Simon Charterparty or pursuant to the provisions of
       any sale and purchase agreement in respect of the sale of the Ship;

       "Original Cost" means an amount equal to the aggregate of:





                                       4
<PAGE>   10
              (i)    the Purchase Price; and

              (ii)   the Conversion and Supply Price;

       "Owner" means Royal Bank of Scotland (Industrial Leasing) Limited and
       includes successors and assignees of the Owner;

       "Permitted Encumbrance" means in respect of the Ship:

       (a)    any Encumbrance arising from the Owner's own acts or defaults;

       (b)    any Encumbrance for Taxes either not yet assessed or, if
              assessed, not yet due and payable or being contested in good
              faith by appropriate proceedings (and for the payment of which
              adequate reserves have been provided) so long as any such
              proceedings or the continued existence of such Encumbrance does
              not involve any likelihood of the sale, forfeiture or loss of or
              of any interest in, the Ship;

       (c)    liens arising in the ordinary course of business by statute or by
              operation of law in respect of obligations which are not overdue
              or which are being contested in good faith by appropriate
              proceedings (and for the payment of which adequate reserves have
              been provided) so long as any such proceedings or the continued
              existence of such items do not involve any likelihood of the
              sale, forfeiture or loss of or of any interest in, the Ship; and

       (d)    any lien for General Average or for Master's, officer's or crew's
              wages outstanding in the ordinary course of trading, any lien for
              salvage and any ship repairer's or outfitters' possessory lien
              for a sum not exceeding the Casualty Amount;

       "Pounds" and the sign "L." means pounds sterling of the United Kingdom;

       "Pre-Primary Period" means the period commencing on the "Delivery Date"
       (as defined pursuant to the Simon Charterparty) and terminating, subject
       to the terms and conditions of this Charterparty, on the Start Date;

       "Primary Period" means the period commencing on the Start Date and
       terminating, subject to the terms and conditions of this Charterparty,
       on 1st April 2001;

       "Purchase Agreement" means the Memorandum of Agreement dated December,
       1990 and made between Simon and the Owner under which Simon sold and the
       Owner purchased the Ship;

       "Purchase Price" means the sum of Five million five hundred thousand
       Pounds (L.5,500,000) paid by the Owner to Simon for the Ship under the
       Purchase Agreement;





                                       5
<PAGE>   11
       "Relevant Documents" means this Charterparty, the Agreement, the
       Conversion and Supply Agreement, the Guarantees, the Goods Contracts,
       the Assignment Agreement, the Deed of Assignment and any other document
       or instrument from time to time executed as a guarantee and/or security
       for the obligations of the Charterer and/or any sums of money from time
       to time owing, whether actually or contingently, under or pursuant to
       this Charterparty and all notices, consents, certificates and other
       documents and agreements issued or, as the case may be, to be issued
       pursuant to any of the foregoing, and until expiry of the warranties
       given to Simon pursuant to the MWB Conversion Contract, includes the MWB
       Conversion Contract;

       "Relevant Event" means any Termination Event or any event which with the
       giving of notice or lapse of time or the satisfaction of any other
       condition (or any combination thereof) would constitute a Termination
       Event;

       "Relevant Party" means all or any one of the Charterer, the Guarantors
       or any other party (other than the Owner and Simon) to any of the
       Relevant Documents;

       "Relevant Rate of Interest" means the rate of interest determined by the
       Owner to be two per cent (2%) per annum above the base rate of The Royal
       Bank of Scotland plc;

       "Requisition Compensation" means all moneys or other compensation from
       time to time payable in respect of the Compulsory Acquisition of the
       Ship;

       "Retained Equipment" means the equipment, machinery and parts set out in
       Part II of Schedule 2;

       "Secondary Period" means the period for which the Charter is extended or
       further extended in accordance with Clause 3.2;

       "Ship" means the m.v. "Simon Labrador" (ex "Seaway Labrador") purchased
       by the Owner pursuant to the Purchase Contract presently registered
       under the Bahamian flag at the Port of Nassau with Official Number
       715224 and includes any share or interest therein and her engines,
       machinery, boats, tackle, outfit equipment, compressors, computers,
       seismic survey equipment, spare gear, fuel, consumables or other stores
       belongings and appurtenances whether on board or ashore (but excluding
       Excluded Equipment, Retained Equipment, Additional Equipment, consumable
       stores and provisions, bunkers, domestic fuel, lubricants, rented
       equipment, and Charterer's additions as contemplated in Clause 20.3)
       which became the property of the Owner pursuant to the Purchase Contract
       and the Conversion and Supply Agreement and belong to the Owner as at
       Delivery or installed on the Ship thereafter or which, having been
       removed therefrom remain the property of the Owner pursuant to this
       Charterparty or the Simon Charterparty together with any and all
       substitutions therefor and replacements and renewals thereof from time
       to time made in or to her in accordance with the provisions of this
       Charterparty and, where the context permits, "Ship" shall include the
       Manuals and Technical Records and "Ship" shall include





                                       6
<PAGE>   12
       Goods while such Goods are on board the Ship, save that where there is
       reference herein to insurance of the Ship, "Ship" shall not include
       Goods if the Goods on board the ship are insured separately from the
       Ship in accordance with the terms of the Master Lease;

       "Simon Charterparty" means that Charterparty by way of Demise dated 20th
       December, 1990 and made between the Owner and Simon in respect of the
       Ship as amended and supplemented from time to time;

       "Simon RBS Documents" means all documents between Simon and the Owner
       relating to the Ship, the Goods or otherwise relating to any of them,
       including (without limitation)

              (a)    Master Lease Agreement between the Owner and Simon and
                     dated 31st March 1992

              (b)    Lease Contract RS920/0017 dated 31st March 1992 and made
                     between the Owner and Simon

              (c)    Lease Contract RS920/0022 dated 31st March 1992 and made
                     between the Owner and Simon

              (d)    the Simon Charterparty

              (e)    Addendum to the Simon Charterparty dated 31st March 1992
                     and made between the parties thereto

              (f)    Letters dated 30th April 1992 from Royal Bank Leasing
                     Limited to Neil Campbell, Finance Director of Simon
                     relating to each of documents (b) and (c) above
                     incorporating a "drop-lock" provision into such contracts.
                     Countersigned 13th May 1992 by Mr. Campbell.

              (g)    Letter of same date between same parties and countersigned
                     on same date relating to amendment to insurance provisions
                     of Clause 11.01(b) of the Master Lease Agreement referred
                     to above;

       "Start Dates" means 31st March, 1991;

       "Subsidiary" of a person means any company or entity directly or
       indirectly controlled by such person for which purpose "control" means
       either ownership of more than 50 per cent of the voting share capital
       (or equivalent right of ownership) of such company or entity, or power
       to direct its policies and management whether by contract or otherwise;

       "Taxes" includes all present and future taxes, levies, imposts, duties,
       fees or charges of whatever nature, including, without limitation,
       corporation, capital gains, income, gross receipts, franchise, transfer,
       sales, use, business, occupation, transaction, purchase, value





                                       7
<PAGE>   13
       added, excise, personal property, real property, stamp, documentary,
       national insurance, or similar taxes at the rate applicable for the time
       being imposed by any national or local taxing authority or any other
       agency or government, together with interest thereon and penalties in
       respect thereof and "Taxation" shall be construed accordingly;

       "Termination Events" means any of the events or circumstances described
       in Clause 24;

       "Termination Sum" means at any relevant time the amount calculated in
       accordance with Schedule 4 as being applicable at such time in respect
       of the Ship excluding the Goods;

       "Total Loss" means any of the following events:

                (i)  the actual or constructive total loss of the Ship
                     (including any damage to the Ship which results in an
                     insurance settlement on the basis of a total loss, or
                     requisition for use or hire of the Ship which results in
                     an insurance settlement on the basis of a total loss);

               (ii)   the Compulsory Acquisition of the Ship; or

              (iii)  the hijacking, theft, condemnation, confiscation, arrest,
                     capture, detention, seizure or requisition for use or hire
                     of the Ship (other than where the same amounts to
                     Compulsory Acquisition of the Ship) unless the Ship be
                     released and restored to the Charterer from such
                     hijacking, theft, condemnation, confiscation, arrest,
                     capture, detention, seizure or requisition for use or hire
                     within thirty (30) days after the occurrence thereof,

       "Total Loss Date" shall have the meaning ascribed thereto in Clause
       21.2(b);

       "Value Added Tax" or "VAT" means value added tax as provided for in the
       Value Added Tax Act 1983 or any similar tax replacing or introduced in
       addition to the same;

       "Yard" means Motorenwerk Bremerhaven GmbH of Barkhausenstrasse, D-2850
       Bremerhaven, Federal Republic of Germany.

1.2    Insurance Definitions

In Clause 16:

       (i)           "excess risks" means the proportion (if any) of claims for
                     general average, salvage and salvage charges and under the
                     ordinary collision clause not recoverable in consequence
                     of the value at which a vessel is assessed for the purpose
                     of such claims exceeding her insured value;





                                       8
<PAGE>   14
       (ii)          "fire and usual marine risks" mean hull and machinery
                     coverage in accordance with Institute Time Clauses Bulls
                     including Institute Additional Perils Clause, or
                     equivalent thereof;

       (iii)         "protection and indemnity risks" means the usual risks
                     covered by an English protection and indemnity association
                     including the proportion (if any) not recoverable in case
                     of collision under the ordinary collision clause; and

       (iv)          "war risks" includes the risk of mines and all risks
                     excluded from the standard form of English marine policy
                     by the free of capture and seizure clause.

1.3    Clause headings and the Index are inserted for convenience of reference
       only and shall be ignored in the interpretation of this Charterparty.

1.4    In this Charterparty, unless the context otherwise requires:

       (a)    references to Clauses and Schedules are to be construed as
              references to the clauses of, and schedules to, this Charterparty
              and references to this Charterparty include its Schedules;

       (b)    references to (or to any specified provision of) this
              Charterparty or any other document shall be construed as
              references to this Charterparty, that provision or that document
              as in force for the time being and as amended in accordance with
              the terms thereof, or as the case may be, with the agreement of
              the relevant parties and (where such consent is, by the terms of
              this Charterparty or the relevant document required to be
              obtained as a condition to such amendment being permitted) the
              prior written consent of the Owner;

       (c)    words importing the plural shall include the singular and vice
              versa;

       (d)    references to a person shall be construed as including, without
              limitation, references to an individual, firm, company,
              corporation, unincorporated body of persons and any Government
              Entity; and

       (e)    without prejudice to any provisions in this Charterparty
              providing for payments to be made or for adjustments to be made
              to amounts payable hereunder in the event of a change in any
              statute or statutory provisions references to statutory
              provisions shall be construed as references to those provisions
              as respectively amended or re-enacted (whether before or after
              the date hereof) from time to time and shall include any
              provisions of which they are re-enactments (whether with or
              without modification) and any subordinate legislation made under
              such provisions so far as such modification or re-enactment
              applies or is capable of





                                       9
<PAGE>   15
              applying to any transactions entered into prior to the date
              hereof and (so far as liability thereunder may exist or can
              arise) shall include also any past statutory provisions or
              regulations (as from time to time modified or re-enacted) which
              such provisions or regulations have directly or indirectly
              replaced.

2      Representations and Warranties

2.1    The Charterer represents and warrants to Simon that:

       (a)    the Charterer is duly incorporated and validly existing under the
              laws of England as a limited liability company and has power to
              carry on its business as it is now being conducted and to own its
              property and other assets;

       (b)    the Charterer has the power to execute, deliver and perform its
              obligations under the Relevant Documents to which it is a party
              and all necessary corporate, shareholder and other action has
              been taken to authorise the execution, delivery and performance
              of the same;

       (e)    the Relevant Documents to which the Charterer is a party,
              constitute or will, upon execution thereof constitute valid and
              legally binding obligations of the Charterer enforceable in
              accordance with their respective terms;

       (d)    the execution and delivery of, the performance of its obligations
              under, and compliance with the provisions of the Relevant
              Documents to which it is a party by the Charterer will not (i)
              contravene any existing applicable law, statute, rule or
              regulation, or any judgment, decree or permit to which the
              Charterer is subject (ii) conflict with, or result in any breach
              of any of the teems of, or constitute a default under, any
              agreement or other instrument to which the Charterer is a party
              or is subject or by which it or any of its property is bound,
              (iii) contravene or conflict with any provision of the
              Charterer's Memorandum and Articles of Association;

       (e)    no litigation, arbitration or administrative proceeding is taking
              place, pending or, to the knowledge of the officers of the
              Charterer, threatened against the Charterer which has not been
              notified to Simon in writing and which is neither frivolous nor
              vexatious and could have a material adverse effect on the
              business, assets or financial condition of the Charterer or its
              ability to perform its obligations under the Relevant Documents
              and such proceedings remain unstayed or unresolved for a period
              exceeding thirty (30) days unless contested by the Charterer in
              good faith;

       (f)    the audited financial statements of the Charterer in respect of
              the financial year ended on 31st December, 1993 as delivered to
              Simon have been prepared in accordance with generally accepted
              accounting principles and practices in the United Kingdom which
              have been consistently applied and present fairly and





                                       10
<PAGE>   16
              accurately the financial position of the Charterer as at such
              date and the results of the operations of the Charterer for the
              financial year ended on such date, and as at such date the
              Charterer did not have any significant liabilities (contingent or
              otherwise) which are not disclosed by, or reserved against in,
              such financial statements and the Charterer did not have any
              unrealised or anticipated losses.

2.2    The Charterer further represents and warrants to Simon that

       (a)    there has been no material adverse change in the financial
              position of the Charterer from that set forth in the financial
              statements referred to in Clause 2.1 (f);

       (b)    every consent, authorisation, license or approval of, or
              registration with, or declaration to, governmental or public
              bodies or authorities or courts required by the Charterer to
              authorise, or required by the Charterer in connection with the
              execution, delivery, validity, enforceability or admissibility in
              evidence of the Relevant Documents, or the performance by the
              Charterer of its obligations under the Relevant Documents has
              been obtained or made and is in full force and effect, and there
              has been no default in the observance of the conditions or
              restrictions (if any) imposed in, or in connection with, any of
              the same;

       (c)    the obligations of the Charterer under the Relevant Documents are
              direct, general and unconditional obligations of the Charterer
              and rank at least pari passu with all other present and future
              unsecured and unsubordinated obligations (including contingent
              obligations) of the Charterer with the exception of such
              obligations as are mandatorily preferred by law and not by
              contract;

       (d)    the Charterer is not (nor would with the giving of notice or
              lapse of time or both be) in breach of or in default under any
              agreement relating to Indebtedness to which it is a party or by
              which it may be bound;

       (e)    the information, exhibits and reports furnished by the Charterer
              to Simon in connection herewith or with the negotiation and
              preparation of this Charterparty are true and accurate in all
              material respects and not misleading, do not omit material facts
              and all reasonable enquiries have been made to verify the facts
              and statements contained therein; there are no other facts the
              omission of which would make any fact or statement therein
              misleading;

       (f)    no Relevant Event has occurred and is continuing; and

       (g)    neither the Charterer's interest in the Insurances or any
              Requisition Compensation nor any part thereof will on Delivery be
              subject to any Encumbrances save for any Permitted Encumbrance.





                                       11
<PAGE>   17
2.3    The representations and warranties in Clause 2.1 (and so that the
       representation and warranty in Clauses 2.1(f) shall for this purpose
       refer to the then latest audited financial statements delivered to Simon
       under Clause 11.1(d)) shall be deemed to be repeated by the Charterer on
       and as of each day from the date of this Charterparty until the end of
       the Charter Period as if made with reference to the facts and
       circumstances existing on each such date.

2.4    The rights and remedies of Simon in relation to any misrepresentation or
       breach of warranty on the part of the Charterer shall not be prejudiced
       by any investigation by or on behalf of Simon into the affairs of any
       person (other than Simon) being a party to any of the Relevant
       Documents, by the performance of any of the Relevant Documents or by any
       other act or thing which may be done or omitted to be done by Simon
       under any of the Relevant Documents and which would or might, but for
       this Clause 2.4, prejudice such rights and remedies.

3      Term of Charter

3.1    Simon shall let and sub-demise and the Charterer shall take on hire the
       Ship, subject to the terms and conditions of this Charterparty, for the
       Primary Period and, if applicable, for the Secondary Period.

3.2    The Charterer shall be entitled (subject as hereinafter provided) on
       giving to Simon notice (which notice, when given shall be irrevocable)
       not less than two hundred and ten (210) days prior to the end of the
       Primary Period, to extend the Charter Period for a period of ten years
       from the last day of the Primary Period.

3.3    Subject to the Charterer indemnifying Simon for all losses, costs and
       expenses incurred by Simon as a result of such termination, the
       Charterer shall be entitled on giving to Simon not less than one hundred
       and fifty (150) days notice (which notice, when given, shall be
       irrevocable) to terminate the Charter Period on any date falling on or
       after the first anniversary of the Delivery Date.  Upon such termination
       the Charterer shall re-deliver the Ship to Simon in accordance with
       Clause 18 and shall pay to Simon an amount equal to the Termination Sum
       on the date of such termination together with all amounts of Charterhire
       and other moneys then due and owing to Simon under this Charterparty or
       any of the other Relevant Documents PROVIDED THAT the Charterer shall,
       not later than one hundred and thirty (130) days prior to such proposed
       termination date have provided to Simon such security as Simon may
       reasonably require for the payment of such amount equal to the
       Termination Sum and all such amounts of Charterhire and such other
       moneys.

3.4    If (a) the Charter terminates on the expiry of the Primary Period, or
       (b) the Charterer shall give notice to terminate the Charter Period
       pursuant to Clause 3.3, then, provided that the Ship shall have been
       returned to Simon in accordance with the subsequent provisions of this
       Clause 3.4 and in accordance with Clause 18 and that Simon shall not be
       prevented





                                       12
<PAGE>   18
       from so doing for any reason whatsoever, Simon shall use all reasonable
       endeavors to procure the Owner to sell the Ship pursuant to the Simon
       Charterparty for delivery on, or as soon as possible after, in the case
       of (a) above, the expiry of the Primary Period or, in the case of (b)
       above, the date of the termination of the Charter Period pursuant to
       Clause 3.2.  All costs and expenses (including legal, advisory,
       printing, advertising, agency and out-of-pocket expenses) incurred by
       Simon in connection with the negotiation, preparation, and execution of
       all documents, the sale of the Ship and delivery shall be for the
       account of the Charterer and shall be reimbursed to Simon from the
       proceeds of sale or, if not sold, on demand.  Notwithstanding anything
       to the contrary in this Charterparty, where the Charter Period expires
       by effluxion of time or if the Charterer gives notice to terminate the
       Charter Period pursuant to Clause 3.3, the Charter Period shall continue
       until and end on the date on which the Ship shall be delivered to a
       purchaser thereof pursuant to a sale of the Ship as contemplated by
       Clause 3.6, whenever such delivery shall take place; it being agreed
       that if by reason of the foregoing the Charter Period continues beyond
       1st April 2001, the Secondary Period shall be deemed to have commenced
       and charterhire shall be payable accordingly.  Immediately prior to such
       termination of the Charter Period the Charterer shall re-deliver the
       Ship to Simon in accordance with Clause 18 and shall pay to Simon an
       amount equal to the Termination Sum on the date of such termination
       together with all amounts of charterhire and other moneys then due and
       owing to Simon under this Charterparty and/or any of the other Relevant
       Documents.

3.5    Upon the termination of the Charter Period and the sale of the Ship in
       accordance with the foregoing provisions of this Clause 3, the Net Sale
       Proceeds shall be applied by Simon (subject to Clause 10.4) as follows:

       (a)    The proportion of the Net Sale Proceeds attributable to the Goods
              shall be calculated and subject to the rights and obligations of
              Simon to the Owner under the Simon Charterparty having first been
              discharged from them (or, if Simon shall previously have
              discharged any such obligations, subject to Simon first
              reimbursing itself in respect thereof) paid to Simon for
              application in accordance with the terms of the Master Lease; and
              the balance shall be applied:

       (b)    Firstly, in or towards settlement of any amounts due and owing by
              the Charterer to Simon under the Charterparty or any other
              Relevant Documents other than the Goods Contracts (including any
              interest due in respect thereof);

       (c)    Secondly, in settlement of all sums due to Simon under the Goods
              Contracts insofar as such sums have not been satisfied by
              application of the sums referred to in Clause 3.5(a);

       (d)    Thirdly, if the Charterer shall on or before the date of
              application of the Net Sale Proceeds by Simon have paid the
              Termination Sum, or a part thereof in accordance with Clauses 3.3
              or 3.4, in or towards refunding by way of rebate of





                                       13
<PAGE>   19
              charterhire to the Charterer the amount of the Termination Sum or
              part thereof so paid by the Charterer; and

       (e)    Subject always to the proviso that an amount equal to two per
              cent (2%) of the Net Sale Proceeds shall be retained by the
              Owner, any balance remaining shall (provided Simon shall receive
              the same from the Owner) be paid by Simon to the Charterer by way
              of rebate of charterhire and/or payment of sales commission or
              otherwise as appropriate.

3.6    In respect of any sale or the Ship on termination or expiry of the
       Charter Period (other than pursuant to Clauses 21.3 or 25.1), the
       Charterer shall act as the sole and exclusive agent of Simon and sub-
       agent of the Owner for the purpose of negotiating the sale of the Ship
       on the following terms:

       (a)    the Charterer will endeavor to arrange the sale of the Ship for a
              cash consideration on the best terms (including price) reasonably
              obtainable on the open market provided that the Ship shall not be
              sold to

              (i)    the Charterer or Simon or any person or persons connected
                     with the Charterer or Simon (as the term "connected
                     persons" is used in section 839 ICTA); or

              (ii) any person acting in trust for, as nominee or as agent or
              otherwise as representative of or on behalf of any of the persons
              referred to in (i) above;

       and the Charterer will keep Simon informed from time to time of its
       progress;

       (b)    the Charterer's authority will not extend to concluding a
              contract for the sale of the Ship for which the Owner's and
              Simon's specific written authority will be required;

       (c)    the Ship shall be offered for sale and for delivery on, or as
              soon as practicable after, such termination or expiry of the
              Charter Period and any contract for its sale shall include terms
              to the following effect:

              (i)    that all conditions, representations or warranties,
                     expressed or implied by statute or otherwise, whether as
                     to the state or quality of the Ship or as to description,
                     fitness for purpose, merchantable quality or otherwise,
                     are, so far as is permitted by law, expressly excluded as
                     between the Owner and Simon and the buyer save in respect
                     of the warranty that the Owner shall be passing such title
                     to the Ship as received from Simon free from any
                     Encumbrances created by the Owner and that Simon has not
                     created any Encumbrances; and





                                       14
<PAGE>   20
              (ii)   that the sale is conditional upon the Owner first
                     recovering possession of the Ship;

              Provided always that nothing in this Clause 3.6(c) shall prevent
              the Charterer including any other representations and warranties
              to be given directly by the Charterer to a buyer in connection
              with such sale; and

       (d)    the Charterer's agency and authority pursuant to the foregoing
              provisions shall terminate if a Relevant Event shall occur and
              Simon shah give notice to the Charterer terminating such
              sub-agency.

4       Conditions Precedent

4.1    The obligation of Simon to charter the Ship to the Charterer under this
       Charterparty is subject to the condition that on Delivery Simon shall
       have received the documents and evidence specified in Schedule 1 in form
       and substance satisfactory to Simon.

4.2    The obligation of Simon to charter the Ship to the Charterer under this
       Charterparty is subject to the further conditions:

       (a)    that the representations and warranties set out in Clause 2.1 and
              2.2 are true and correct as if each were made with respect to the
              facts and circumstances existing immediately prior to the time
              when Delivery is to take place;

       (b)    that no Relevant Event shall have occurred and be continuing or
              would arise by reason of Delivery taking place.

4.3    The conditions specified in Clauses 4.1 and 4.2 are inserted for the
       sole benefit of Simon and may be waived in whole or in part and with or
       without conditions by Simon provided that if any of the said conditions
       are outstanding after Delivery has taken place then, unless Simon shall
       have given a specific written waiver or deferral in respect thereof the
       Charterer shall ensure that such outstanding conditions are fulfilled
       within thirty (30) days of the Delivery Date and Simon shall be entitled
       to treat the failure of the Charterer to perform such outstanding
       conditions within such period of thirty (30) days as a Termination
       Event.

5      Delivery and Acceptance

5.1    On Delivery the Ship shall be delivered to the Charterer and the
       Charterer shall take delivery of the Ship under this Charterparty.  The
       Ship shall become subject to and governed by this Charterparty and the
       Charter Period shall commence.

5.2    The Charterer acknowledges and confirms that the conversion works
       carried out to the Ship and the equipment supplied thereto and BFE
       pursuant to the Conversion and Supply





                                       15
<PAGE>   21
       Agreement and/or the MWB Conversion Contract, shall be part of the Ship
       and deemed delivered to the Charterer and shall become subject to and
       governed by this Charterparty and the Charterer shall be deemed to have
       taken delivery thereof under this Charterparty.

5.3    The Charterer acknowledges that prior to Delivery the Charterer has in
       accordance with management arrangements with Simon conducted its seismic
       survey business on and by use of the Ship through the services of its
       own employed personnel and has thereby had sufficient opportunity to
       carry out any inspections of the Ship, her condition and any and all
       equipment installed or used thereon and the condition of the Ship on
       delivery to the Charterer shall be the sole responsibility of the
       Charterer, and the Charterer shall not be entitled for any reason
       whatsoever to refuse to accept delivery of the Ship under this
       Charterparty and Simon shall not be liable for any loss or expense, or
       any loss of profit, resulting directly or indirectly from any defect or
       alleged defect in the Ship or failure or alleged failure of the Ship to
       comply in all respects with the terms of the Simon Charterparty and the
       Charterer agrees that upon delivery the Charterer shall accept the Ship
       "as is, where is" and shall indemnify and hold Simon harmless in respect
       of any failure of the Ship to comply with the terms of the Simon
       Charterparty or any failure of any Goods to comply with the terms of any
       of the Simon RBS Documents.

6      Extent of Simon's Liability: Third Party Warranties

       6.1.1  Simon warrants that, subject to Clause 21.1 and Clause 25, Simon
              shall not interfere during the Charter Period with the use,
              possession and quiet enjoyment of the Ship by the Charterer on
              the terms of this Charterparty.

       6.1.2  If the Owner shall be in breach of the Owner's obligations
              pursuant to Clause 6.1 of the Simon Charterparty, Simon will at
              the cost and request of the Charterer take such steps as the
              Charterer may reasonably require to enforce Simon's rights
              against the Owner to have such breach remedied.

6.2    The Charterer expressly agrees and acknowledges that, save only as
       provided in Clauses 6.1 and 14.2, no condition, warranty or
       representation of any kind is or has been given by or on behalf of Simon
       in respect of the Ship or any part thereof or any work during conversion
       or any part or equipment then installed or any BFE, and accordingly the
       Charterer confirms that it has not, in entering into this Charterparty,
       relied on any condition, warranty or representation by Simon or any
       person on Simon's behalf (whether authorised or not), express or
       implied, whether arising by law or otherwise in relation to the Ship or
       any part thereof or any work during conversion or any part or equipment
       then installed or any BFE, including, without limitation, warranties or
       representations as to the description, seaworthiness, merchantability,
       fitness for any purpose, value, condition, design or operation of any
       kind or nature of the Ship or any part thereof or any work during
       conversion or any part or equipment then installed or any BFE, and the
       benefit of any such condition, warranty or representation by the Owner
       is hereby irrevocably and unconditionally waived by Simon.  To the
       extent permissible under applicable lam,





                                       16
<PAGE>   22
       Charterer hereby also waives any rights which it may have in tort in
       respect of any of the matters referred to above and irrevocably agrees
       that Simon shall have no greater liability in tort in respect of any
       such matter than it would be in contract after taking account of all of
       the foregoing exclusions.  No third party making any representation or
       warranty relating to the Ship or any part thereof is the agent of Simon
       nor has any such third party authority to bind Simon thereby.

6.3    During the Charter Period Simon will use reasonable endeavors to extend
       to the Charterer the benefit of all warranties and indemnities given by
       any manufacturer or supplier of any part of the Ship or any work during
       conversion or any part or equipment then installed or any BFE or the
       Goods.  The Charterer shall be entitled during the Charter Period, with
       the prior written approval of Simon, to take such action upon any such
       warranty or indemnity in the name of Simon and (with the consent of the
       Owner) the Owner against any such manufacturer or supplier as the
       Charterer shall see fit, but subject to the Charterer first ensuring
       that each of Simon and the Owner is indemnified and secured to its
       reasonable satisfaction against all costs and expenses thereby incurred
       or to be incurred.

7      Charterhire

7.1    During the Primary Period the Charterer shall pay to Simon on the
       respective Charterhire Payment Dates installments of Charterhire for the
       Ship in arrears, each such installment being of the amount specified in
       paragraph 2 of Schedule 3 one such installment being payable on each
       Charterhire Payment Date falling during the Primary Period.

7.2    During the Secondary Period the Charterer shall pay to Simon on the
       respective Charterhire Payment Dates installments of charterhire for the
       Ship in advance, each such installment being of the amount specified in
       paragraph 6 of Schedule 3 one such installment being payable on each
       Charterhire Payment Date falling during the Secondary Period.

7.3    The installments of Charterhire and all other sums payable by the
       Charterer to Simon under this Charterparty are exclusive of any Value
       Added Tax or similar tax payable in respect thereof which shall in each
       case be paid in addition thereto.

7.4    The Charterer's obligation to pay Charterhire and make other payments in
       accordance with this Charterparty shall subject to Clause 21.3, be
       absolute and unconditional irrespective of any contingency whatsoever
       including (but not limited to) (i) any right of set-off, counterclaim,
       recoupment, defense or other right which either party hereto may have
       against the other, (ii) any unavailability of the Ship for any reason,
       including, but not limited to, any lack or invalidity of title or any
       other defect in the title, seaworthiness, merchantability, fitness for
       any purpose, condition, design, or operation of any kind or nature of
       the Ship, or the ineligibility of the Ship for any particular use or
       trade, or for registration or documentation under the laws of any
       relevant jurisdiction, or any damage





                                       17
<PAGE>   23
       to the Ship, (iii) any failure or delay on the part of either party
       hereto, whether with or without fault on its part, in performing or
       complying with any of the terms or conditions of this Charterparty, (iv)
       any insolvency, bankruptcy, administration, reorganisation, arrangement
       readjustment of debt, dissolution, liquidation or similar proceedings by
       or against Simon, or the Charterer, (v) any lack of due authorisation of
       or other defect in this Charterparty.

7.5    The provisions of this Clause 7 with regard to the calculation and
       payment of charterhire during the Pre-Primary Period and the Primary
       Period are subject to adjustment in accordance with the charterhire
       adjustment provisions contained in Schedule 3.

7.6    No charterhire paid in advance shall (except as expressly contemplated
       by the provisions of this Charterparty) be repayable by or recoverable
       from Simon.

7.7    Notwithstanding any other Clause of this Charterparty, payments of
       charterhire pursuant to this Charterparty shall be in respect of the
       Ship excluding the Goods.

8      Payments, Interest and Calculations

8.1    Subject as provided in Schedule 6 the Charterer shall pay the stipulated
       charterhire on the Charterhire Payment Dates falling on or after the
       date hereof.  All payments to be made by the Charterer under this
       Charterparty shall be made (unless specifically otherwise provided in
       this Charterparty) without prior demand and in full, without any set-off
       or counterclaim whatsoever and, subject as provided in Clause 10.3, free
       and clear of any deductions or withholdings in Pounds (or, in the case
       of indemnity payments, in the currency in which the cost or expense
       which is the subject of the indemnity payment is incurred) for value on
       the day on which payment is due to the account of the Owner with The
       Royal Bank of Scotland plc, 45 The Promenade, Cheltenham,
       Gloucestershire GL50 1PY (Sort Code: 16-16-13 and Account Number:
       12176088) or to such other account as Simon may from time to time notify
       to the Charterer in writing.

8.2    Other than any sum payable on demand, which shall be payable in
       accordance with such demand, when any payment under any of the Relevant
       Documents would otherwise be due on a day which is not a Banking Day,
       the due Date for payment shall be the preceding Banking Day.

8.3    If the Charterer fails to pay any sum (including without limitation, any
       sum payable pursuant to this Clause 8.3) on its due date for payment
       under this Charterparty the Charterer shall pay to Simon on demand
       interest on such sum compounded daily, from the due date up to the date
       of actual payment (as well after as before any relevant judgment) at the
       Relevant Rate of Interest.

8.4    All interest under this Charterparty shall accrue from day to day and
       shall be calculated on the basis of the actual days elapsed and a 365
       day year.





                                       18
<PAGE>   24
8.5    Any certificate or determination of the Owner or Simon as to any rate of
       interest or any other amount payable under this Charterparty shall in
       the absence of manifest error, be conclusive and binding on the
       Charterer in the case of a certificate or determination of the Owner and
       prima facie evidence of such rate or amount in the case of a certificate
       or determination of Simon.

8.6    If any sum due from the Charterer under any of the Relevant Documents or
       under any order or judgment given or made in relation thereto has to be
       converted from the currency ("the first currency") in which the same is
       payable under any of the Relevant Documents or under such order or
       judgment into another currency ("the second currency") for the purpose
       of (i) making or filing a claim or proof against the Charterer, (ii)
       obtaining an order or judgment in any court or other tribunal or (iii)
       enforcing any order or judgment given or made in relation to such
       Relevant Document, the Charterer shall indemnify and hold harmless Simon
       from and against any loss suffered as a result of any difference between
       (a) the rate of exchange used for such purpose to convert the sum in
       question from the first currency into the second currency and (b) the
       rate or rates of exchange at which Simon may in the ordinary course of
       business purchase the first currency with the second currency upon
       receipt of a sum paid to it in satisfaction, in whole or in part, of any
       such order, judgment, claim or proof. Any amount due from the Charterer
       under this Clause 8.6 shall be due as a separate debt and shall not be
       affected by judgment being obtained for any other sums due under or in
       respect of any of the Relevant Documents and the term "rate of exchange"
       includes any premium and costs of exchange payable in connection with
       the purchase of the first currency with the second currency.

9      Costs and Indemnities

9.1    The Charterer shall pay promptly all costs or expenses of or arising
       from, delivery, import, export, design, registration, classification,
       ownership, possession, control, use, management, manning, victualling,
       the provision of bunkers and lubricating oils, chartering,
       sub-chartering, insurance, maintenance, conversion, repair, dry docking,
       survey, refurbishment, condition, service, overhaul, modification,
       change, alteration, loss, damage, storage, laying up, removal,
       re-delivery, sale or disposal of in or to the Ship, and all costs or
       expenses otherwise arising in connection with the Ship or the
       performance of the Charterer's obligations under any of the Relevant
       Documents.

9.2    The Charterer shall pay all stamp, documentary, registration or other
       like Taxes (including any such Taxes payable by Simon) imposed on or in
       connection with the Relevant Documents and shall indemnify Simon against
       any liability arising by any delay or omission of the Charterer to pay
       such duties or Taxes.

9.3    The Charterer shall pay to Simon on demand all expenses (including
       legal, survey and other costs) incurred by Simon in contemplation of, or
       otherwise in connection with, the enforcement of, or preservation of any
       rights under, any of the Relevant Documents, or otherwise in respect of
       moneys owing under any of the Relevant Documents, or in respect





                                       19
<PAGE>   25
       of breach of any representation, warranty, covenant, agreement,
       condition or stipulation therein contained or in respect of the
       repossession of the Ship.  All expenses payable pursuant to this Clause
       9.3 shall be paid together with any irrecoverable Value Added Tax or
       similar tax thereon, and in the currency in which the same are incurred
       by Simon.

9.4    The Charterer shall indemnify and hold harmless Simon, without prejudice
       to any of Simon's or the Owner's other rights under any of the Relevant
       Documents, from and against:

       (a)    any costs or expenses which the Charterer has agreed to pay but
              which shall nevertheless be claimed from or assessed against or
              paid by Simon, and against any liability incurred by Simon by
              reason of any delay or failure of the Charterer to pay any such
              costs or expenses;

       (b)    any Taxes which the Charterer has agreed to pay but which shall
              nevertheless be claimed from or assessed against or paid by
              Simon, and against any liability incurred by Simon by reason of
              any delay or failure of the Charterer to pay any such Taxes
              including without limitation, any delay or failure of the
              Charterer to make any such deduction or withholding as is
              referred to in Clause 10.3 or by reason of any increased payment
              as is referred to in Clause 10.3 not being made on the due date
              for such payment.

9.5    Without prejudice to the Charterer's obligations under Clauses 9.1 to
       9.4 inclusive, the Charterer agrees at all times, whether before, during
       or after the Charter Period, to indemnify and hold harmless Simon from
       and against all costs, expenses, payments, charges, losses, demands,
       liabilities, claims, actions, proceedings (whether civil or criminal),
       penalties, fines, damages, judgments, orders or other sanctions, liens,
       salvage, General Average (in this Clause 9.5 together referred to as
       "Losses") which may be incurred by, or made or asserted against Simon or
       the Owner at any time:

       (a)    relating to, or arising directly or indirectly in any manner or
              for any cause or reason whatsoever out of the design, nature,
              description, manufacture, testing, purchase, delivery, import,
              export, registration, flag, classification, certification,
              ownership, possession, control, use, operation, manning, crewing,
              navigation, victualling, supply or servicing (whether at sea or
              not), provision of bunkers and lubricating oils, chartering, sub-
              chartering, insurance, maintenance, conversion, repair, dry
              docking, surveys, refurbishment, condition, service, overhaul,
              modification, change, alteration, loss, damage, removal, laying
              up, storage, re-delivery, sale or disposal of, in or to the Ship,
              conversion works, parts and equipment installed and BFE or
              otherwise in connection with the Ship, conversion works, parts,
              equipment and BFE, or relating to loss or destruction of or
              damage to any property, or death or injury of, or other loss of
              whatsoever nature suffered by, any person caused by, relating to,
              or arising from or out of (in each case whether directly or
              indirectly) any of the foregoing matters;





                                       20
<PAGE>   26
       (b)    which may be made or brought on the ground that any design,
              article or material in the Ship or in respect of the conversion
              works, parts, equipment and BFE installed and supplied or to be
              installed and supplied to the Ship pursuant to the Conversion and
              Supply Agreement or the operation or use thereof constitutes an
              infringement of patent, intellectual property right or any other
              right whatsoever;

       (c)    in preventing or attempting to prevent the arrest confiscation,
              seizure, taking in execution, impounding, forfeiture or detention
              of the Ship, or in securing the release of the Ship or any of the
              parts, equipment or BFE installed or to be installed on the Ship
              except to the extent any Losses are incurred in this respect as a
              result of Simon's breach of Clause 6.1 due to any Encumbrance on
              the Ship directly created by Simon (or by the Owner) which
              adversely affects the operation of the Ship;

       (d)    as a consequence of any default in payment by the Charterer of
              any sum under any of the Relevant Documents when due or any other
              default by the Charterer in the due and punctual performance of
              its obligations under any of the Relevant Documents.

9.6    Notwithstanding anything to the contrary contained in this Charterparty,
       the indemnities by the Charterer in favor of Simon contained in this
       Charterparty shall continue in full force and effect notwithstanding any
       breach by Simon or the Charterer of the terms of this Charterparty
       (including any fundamental breach) or any of the other Relevant
       Documents, the termination of the chartering of the Ship to the
       Charterer under this Charterparty, the repudiation by Simon or the
       Charterer of this Charterparty, the termination of the leasing of the
       Goods under Clause 3.03 of the Master Lease or the expiration of the
       Charter Period by effluxion of time or otherwise.

9.7    Moneys becoming due by the Charterer to Simon under the indemnities
       contained in this Clause 9 or elsewhere in the Relevant Documents shall
       be paid on demand made by Simon and shall be paid together with interest
       thereon at the Relevant Rate of Interest from the date of demand by
       Simon to the date of reimbursement by the Charterer to Simon (after as
       well as before judgment).

10     Taxation

10.1   The Charterer shall pay promptly all Taxes levied or assessed on or in
       respect of the Ship, any payments made under any of the Relevant
       Documents or any of the transactions contemplated by any of the Relevant
       Documents but, subject to the remaining provisions of this Clause 10,
       excluding any Taxes assessed against Simon (or the Owner) by reference
       to its overall profits, or by reference to its gains, if any, realised
       in connection with the ultimate disposal of the Ship, or arising out of
       a Total Loss.





                                       21
<PAGE>   27
10.2   (a) Sums payable to Simon by the Charterer under any Relevant Document
       by way of indemnity or reimbursement shall be calculated on an after-tax
       basis.  Accordingly, if and to the extent that any such sum payable to
       Simon is taxable in the hands of Simon as the auditors of Simon (acting
       as experts and not as arbitrators) shall certify from time to time such
       sum shall be increased to an amount which (after subtracting any
       Taxation suffered by Simon on the increased payment and after taking
       into account any deduction for Taxation purposes available to Simon in
       respect of the discharge by Simon of any corresponding liability to a
       third party) shall equal the amount which Simon would have received had
       the sum payable by the Charterer not been taxable in the hands of Simon.
       If the sum payable by the Charterer is initially paid on the basis that
       it is not taxable in the hands of Simon and it is subsequently
       determined to be taxable or vice versa, such adjustment and payment
       shall be made between Simon and the Charterer as the auditors of Simon
       (acting as experts and not as arbitrators) shall certify as appropriate
       to restore the after-tax position of Simon to that which it would have
       been had the adjustment not been necessary.

       (b)    If and to the extent that any sum (the "indemnity sum")
              constituting (directly or indirectly) an indemnity to Simon but
              paid by the Charterer to any person other than Simon, shall be
              treated as taxable in the hands of Simon, the Charterer shall pay
              to Simon such sum (the "compensating sum") as (after subtracting
              any Taxation suffered by Simon on the compensating sum and after
              taking into account any deductions for the purposes of Taxation
              available to such person in respect of any corresponding payment
              treated as made by Simon to such person) shall reimburse Simon
              for any Taxation suffered by it in respect of the indemnity sum.

       (c)    For the purposes of this Clause 10.2 a sum shall be deemed to be
              taxable in the hands of Simon if it fails to be taken into
              account in computing the profits or gains of Simon for the
              purposes of Taxation and if so Simon shall be deemed to have
              suffered Taxation thereon at the rate of Taxation applicable to
              Simon's profits or gains for the period in which the payment
              fails to be taken into account for the purposes of such Taxation.

10.3   If at any time any applicable law, regulation or regulatory requirement,
       or any governmental authority, monetary agency or central bank requires
       the Charterer to make any deduction or withholding in respect of Taxes
       from any payment due under the Relevant Documents:

       (i)    the sum due from the Charterer in respect of such payment shall
              be increased to the extent necessary to ensure that, after the
              making of such deduction or withholding, Simon receives on the
              due date for such payment a net sum equal to the sum which it
              would have received had no such deduction or withholding been
              required to be made;





                                       22
<PAGE>   28
       (ii)   the Charterer shall pay to the relevant authority within the
              period for payment permitted by applicable law the full amount of
              the deduction or withholding (including, but without prejudice to
              the generality of the foregoing, the full amount of any deduction
              or withholding from any increased amount paid pursuant to this
              Clause 10.3); and

       (iii)  the Charterer shall furnish to Simon within the period for
              payment permitted by applicable law, evidence of payment to the
              relevant authority of all amounts deducted or withheld as
              aforesaid.

10.4   If Simon is required to pay any sum to the Owner, the Charterer or any
       other party under any of the Relevant Documents and such sum is payable
       out of or represents a reimbursement of an amount which is brought into
       account in computing the profits or gains of Simon for the purposes of
       Taxation and such payment will not be allowed to Simon as a deductible
       trading expense or as a basis for, or otherwise as, a deduction or
       off-set for Taxation purposes in the accounting period of Simon in which
       it is required to be paid as the auditors of Simon (acting as experts
       and not as arbitrators) shall certify from time to time, the Charterer
       shall pay to Simon such amount as shall put Simon in the same after-tax
       position as Simon would have been in had the payment been allowed as a
       deductible trading expense or as a basis for, or otherwise as, a
       deduction or set-off as aforesaid.  If any such payment is initially
       made on the basis that it is a deductible trading expense, or that it
       will be allowed as a basis for, or otherwise as, a deduction or off-set
       of Simon for tax purposes in the accounting period of Simon in which it
       is incurred and it is subsequently determined that it is not, or vice
       versa, such adjustment and payments, if any, shall be made between the
       Owner and the Charterer as Simon's auditors from time to time (acting as
       experts and not as arbitrators) may certify as appropriate in order to
       restore the after-tax position of Simon to that which it would have been
       had the adjustment not been necessary.

11     General Undertakings

11.1   The Charterer undertakes with Simon that it will :

       (a)    Notification of Relevant Event

              promptly inform Simon of any Relevant Event forthwith upon
              becoming aware thereof;

       (b)    Consents and Authorisations

              without prejudice to Clauses 2.2 and 4, obtain or cause to be
              obtained, maintain in full force and effect and comply in all
              material respects with the conditions and restrictions (if any)
              imposed in, or in connection with, every consent, authorisation,
              license or approval of governmental or public bodies or
              authorities





                                       23
<PAGE>   29
              or courts and do, or cause to be done, all other acts and things,
              which may from time to time be necessary or desirable under
              applicable law for the continued due performance of all its
              obligations under any of the Relevant Documents;

       (c)    Preparation of Accounts

              cause to be prepared in each financial year and cause to be
              certified by its auditors consolidated financial statements which
              are prepared in accordance with generally accepted accounting
              principles and practices in England which have been consistently
              applied and present fairly and accurately the financial position
              of the Charterer as at the end of the relevant financial year and
              the results of the operations of the Charterer for the relevant
              financial year, which discloses all significant liabilities
              (contingent or otherwise) of the Charterer;

       (d)    Supply of Accounts

              deliver to Simon a copy of the financial statements referred to
              in Clause 11.1 (c) as soon as practicable but not later than two
              hundred and forty (240) days after the end of the financial
              period to which they relate and a copy of every report, notice or
              like document issued by it to its shareholders or creditors
              generally (in each case at the time of issue thereof);

       (e)    Information concerning the Charterer and the Guarantors

              promptly provide to the Owner following a request by Simon or the
              Owner with financial and other information concerning the
              Charterer and the Guarantors and their respective affairs as the
              Owner (or Simon, in order to comply with its obligations pursuant
              to the Simon charterparty) may from time to time reasonably
              require;

       (f)    Information concerning the Ship

              upon request by Simon or the Owner furnish:

              (i)    Simon promptly with all such information as it may from
                     time to time reasonably require regarding the Ship, her
                     insurance, condition, and maintenance; and

              (ii)   the Owner promptly with all such information as it may
                     from time to time reasonably require regarding the Ship,
                     her insurance, condition, maintenance, employment,
                     position and engagements, particulars of all towages and
                     salvages, and copies of all charters and other contracts
                     for her employment, or otherwise howsoever concerning her;
                     and





                                       24
<PAGE>   30
       (g)    Observance of Covenants

              duly and punctually perform each of its obligations under this
              Charterparty and the other Relevant Documents.

11.2   Protection of Owner's and Simon's Rights

       The Charterer hereby further undertakes with Simon that throughout the
       Charter Period it will :

       (a)    Disposal of the Ship

              not attempt or hold itself out as having any power to sell agree
              to sell transfer or otherwise dispose of or (except to avoid loss
              of life or personal injury or as otherwise agreed pursuant to
              Clause 21) abandon the Ship, any share or interest therein;

       (b)    Encumbrances

              not create or agree or purport to create any Encumbrance over the
              Ship, any share or interest therein or in the Insurances or
              Requisition Compensation or any part thereof (other than
              Permitted Encumbrances);

       (c)    Notification of Arrest

              notify Simon promptly by telex or fax of any arrest or detention
              of the Ship or any exercise or purported exercise of a lien or
              other claim on the Ship or the Insurances or any part thereof;

       (d)    Prevention of and Release from Arrest

              promptly pay and discharge all debts, damages, liabilities and
              outgoings whatsoever which have given or may give rise to
              maritime, statutory or possessory liens on, or claim enforceable
              against, the Ship or the Insurances or any part thereof and, in
              the event of a writ or libel being filed against the Ship or the
              Insurances or any part thereof or of any of the same being
              arrested, attached or levied upon pursuant to legal process or
              purported legal process or in the event of detention of the Ship
              in exercise or purported exercise of any such lien or claim as
              aforesaid, to procure the release of the Ship and the Insurances
              from such arrest, detention, attachment or levy or, as the case
              may be, the discharge of the writ or libel forthwith upon
              receiving notice thereof by providing bail or procuring the
              provision of security or otherwise as the circumstances may
              require;





                                       25
<PAGE>   31
       (e)    No Pledging of Simon's Credit

              not pledge the credit of Simon or the Owner for any maintenance,
              service, repairs, drydocking, or modifications to, or changes or
              alterations in, the Ship or for any other purpose whatsoever;

       (f)    Protection of Simon's and the Owner's Rights in the Ship

              not do or permit to be done any act or thing which might
              jeopardise the title, rights and interest of Simon and the Owner
              in the Ship and/or omit or permit to be omitted to be done any
              act which might prevent that title and those rights and interest
              from being jeopardised;

       (g)    Notice of Owner's and Simon's Rights

              generally on all occasions when the ownership of the Ship is
              relevant make clear to third parties that the same is the
              property of the Owner and is chartered by way of sub-demise from
              Simon and the Charterer agrees to fasten to the Ship in a
              conspicuous place and to keep so fastened during the Charter
              Period a notice reading as follows:

                     "This Ship is the property of and is registered in the
                     name of ROYAL BANK OF SCOTLAND (INDUSTRIAL LEASING)
                     LIMITED.  It is under demise charter to SIMON-HORIZON
                     LIMITED ("Simon") and chartered by sub-demise by Simon to
                     Horizon Exploration Limited and, by the terms of each such
                     Charterparty, neither the Charterer nor the Master nor any
                     servant or agent thereof nor any other person has any
                     right, power or authority whatsoever to contract on behalf
                     of the Owner or Simon or to pledge the Owner's or Simon's
                     credit or to involve the Owner or Simon in any liability
                     whatsoever and neither has the Owner nor Simon nor the
                     Charterer nor the Master nor any servant or agent thereof
                     nor any other person has any right, power or authority
                     whatsoever to create, incur, or permit to be imposed on
                     the Ship any lien whatsoever except for General Average,
                     crews' wages and salvage."

              or in such other form as the Owner or (subject to the Owner's
              consent) Simon may require from time to time;

              the Charterer shall not remove or cover up such notice, and will
              not place or permit to be placed any other notice (affecting the
              ownership of the Ship or otherwise relating to the rights of the
              Owner or Simon and dealing with the rights of any person other
              than the Owner in or on the Ship or any part thereof) without
              prior written consent of the Owner or (subject to the Owner's
              consent) Simon such consent not to be unreasonably withheld so
              long as the some is not inconsistent with the rights of the Owner
              of the Ship;





                                       26
<PAGE>   32
              the Charterer agrees to give written instructions with regard to
              the foregoing matters to the Master of the Ship, such
              instructions to be in such terms as may from time to time be
              required by the Owner or (subject to the Owner's consent) Simon;
              and

       (h)    Release from Arrest: Owner's and Simon's Vessels

              if the Ship or any other vessel for the time being owned (in
              whole or in part) by or chartered to the Owner or Simon shall at
              any time have a writ or libel filed against it or be arrested,
              attached or levied upon pursuant to any legal process or
              purported legal process or be detained in exercise or purported
              exercise of any, lien or claim of whatsoever nature, whether
              arising out of the use or operation of the Ship or out of the use
              or operation of any other vessel owned by or chartered to the
              Charterer or other company (other than the Owner or Simon)
              associated with, the Charterer or its subsidiaries or associated
              companies or otherwise by reason of the act or omission of any of
              the aforesaid Charterer or other company (other than the Owner or
              Simon) associated with the Charterer or its subsidiaries or
              associated companies, the Charterer shall forthwith upon
              receiving notice thereof at its expense procure the release of
              the Ship or such other vessel (as the case may require) from such
              arrest, detention, attachment or levy or, as the case may be, the
              discharge of the writ or libel by providing bail or procuring the
              provision of security or otherwise as the circumstances may
              require and the Charterer shall be responsible for discharging
              each and every liability in connection with any such process,
              claim, lien or other action.  Without prejudice to the generality
              of the other indemnities contained in this Charterparty, should
              any other vessel owned by the Owner or Simon and chartered by the
              Owner or Simon otherwise than to the Charterer be arrested,
              detained, attached or levied upon or be the subject of a writ or
              libel in such circumstances, the Charterer shall indemnify the
              Owner and Simon against all claims made on the Owner and Simon by
              the charterers of such other vessel in connection with such
              arrest, detention, attachment levy, writ or libel.

12     Sub-Chartering

       The Charterer will not at any time without the prior written consent of
       Simon (which shall be subject to the consent of the Owner under the
       Simon Charterparty and Simon shall have full liberty to withhold except
       in the case of a sub-charter to a Guarantor, if the prior written
       consent of the Owner shall have been obtained, when Simon shall not
       unreasonably withhold or delay consent) and, if such consent is given,
       only subject to such conditions as Simon may impose, part with the
       possession or operational control of the Ship (except for the purpose of
       maintenance, service, repair or overhaul work or any modifications,
       changes or alterations permitted under this Charterparty and the
       Conversion and Supply Agreement) or sub-charter the Ship:





                                       27
<PAGE>   33
       (a)    on demise charter for any period;

       (h)    by any time or consecutive voyage charter for a term which
              exceeds or which by virtue of any optional extensions therein
              contained may exceed thirteen months' duration;

       (c)    on terms whereby more than two months' hire (or the equivalent)
              is payable in advance;

       (d)    below the market rate prevailing at the time when the Ship is
              fixed or on any other than arms' length terms;

       (e)    on any charter for a period extending or capable of extending
              beyond the end of the Charter Period as extended pursuant to
              Clause 3.2;

       (f)    on terms involving any transfer or purported transfer of title or
              interest in the Ship or part thereof or which would contravene
              the provisions of this Charterparty or any of the other Relevant
              Documents (including, without limitation, the provisions of
              Clause 13.2(d) relating to qualifying use during the requisite
              period as therein referred to).

13     Use and Trade of the Ship

13.1   Permitted Use

       Subject to the other terms and conditions of this Charterparty and the
       other Relevant Documents, the Charterer shall have the full and
       exclusive use control and command of the Ship during the Charter Period
       and may operate the Ship or employ her throughout the world in any
       lawful trade for which she is suitable.

13.2   Undertakings concerning Use

       The Charterer hereby undertakes with Simon that throughout the Charter
       Period it will:

       (a)    Ship's Registration

              not do or suffer to be done anything whereby the documentation of
              the Ship for the time being in accordance with the provisions of
              Clause 14.2 may be forfeited or imperilled;

       (b)    Employment

              not employ the Ship or permit her employment in any manner, trade
              or business which is forbidden by international law, or which is
              unlawful or illicit under the





                                       28
<PAGE>   34
              law of any relevant jurisdiction, or in carrying illicit or
              prohibited goods, or in any manner whatsoever which may render
              her liable to condemnation in a Prize Court, or to destruction,
              seizure, confiscation, penalty or sanctions and, in the event of
              hostilities in any part of the world (whether war be declared or
              not), not employ the Ship or permit her employment in carrying
              any contraband goods, or enter or trade to or continue to trade
              in any zone which is declared a war zone by any government or by
              the Ship's war risks insurers unless such special insurance cover
              as Simon may require shall have been effected by the Charterer
              and at its expense;

       (c)    Payment of Outgoings and Evidence of Payments

              pay all tolls, dues and other outgoings whatsoever in respect of
              the Ship and the Insurances and keep proper books of account in
              respect of the Ship and, as and when Simon may so require, make
              such books available for inspection on behalf of Simon or the
              Owner and furnish satisfactory evidence that the wages and
              allotments and the insurance and pension contributions of the
              Master and crew are being promptly and regularly paid and that
              all deductions from crew's wages in respect of United Kingdom tax
              liability are being properly accounted for and that the Master
              has no claim for disbursements other than those incurred by him
              in the ordinary course of trading on the voyage then in progress;

       (d)    Operation in the U.S.A. or Canada

              give Simon at least fourteen (14) Banking Days prior written
              notice if the Ship is to be operated in or into or offshore from
              the United States of America or Canada, and prior to the
              commencement of such operation, to increase the amount of
              protection and indemnity, pollution risk and other legal
              liability insurance referred to in Clause 16.1 (a) to such amount
              as the Owner may require;

       (e)    Use for a Qualifying Purpose

              not to use the Ship or permit the Ship to be used and shall
              procure that the Ship is not used other than for a qualifying
              purpose during the requisite period (as each such term is defined
              in section 40 CAA) so as to result in the application of sections
              42, 43, 44 and 46 CAA and shall immediately notify Simon if at
              any time within such requisite period the Ship is used for
              leasing to a non-resident within the meaning of section 50 CAA
              and also notify Simon of any event or matter which under section
              48 CAA ought to be notified by the Owner to the Board of the
              Inland Revenue or any Inspector of Taxes in connection with the
              Ship or the chartering thereof and shall promptly furnish when
              the Owner or Simon may require such information as may properly
              be required to be so furnished by the Owner to the Board of the
              Inland Revenue and Inspector of Taxes regarding the chartering of
              the Ship or the use to which it is being put or has been put, in
              order





                                       29
<PAGE>   35
              to enable the Owner to comply with the provisions of section 48
              CAA or to respond to such a request; and

       (f)    Bills of Lading

              if applicable, procure that all Bills of Lading issued for
              carriage of goods by the Ship shall contain a Paramount Clause
              incorporating any legislation relating to carrier's liability for
              cargo compulsorily acquired applicable in the trade or, if no
              such legislation exists, Bills of Lading incorporating the
              British Carriage of Goods by Sea Act 1971 and that all such Bills
              of Lading shall also contain the amended New Jason Clause and the
              Both-Blame Collision Clause and, without prejudice to provisions
              of Clause 30.4, provide that the General Average, if any, shall
              be settled according to the York-Antwerp Rules of 1974 in London.

14     Title, Registration, Name and House Flag

14.1   Title

       Title to the Ship shall remain vested in the Owner.  The Charterer shall
       have no right, title or interest in or to the Ship or any part thereof
       except the right to use the same upon the terms and conditions contained
       in this Charterparty.  It is hereby expressly declared that the
       Charterer shall not have any option or right to acquire title to or any
       proprietary interest in the Ship or any part thereof Subject to Clause
       6.1, nothing in this Clause 14.1 shall be construed as imposing any
       liability on or on the part of Simon or the Owner to the Charterer in
       respect of or arising out of the acts or omissions of any third party
       (including any charterer or lessee of any other vessel or assets of the
       Owner or Simon) affecting the Charterer or the Ship or otherwise.

14.2   Initial Registration

       The Ship is registered under the laws of the Commonwealth of the Bahamas
       at the Port of Nassau in the name of the Owner as owner and subject to
       Clause 14.3 Simon shall during the Charter Period use all reasonable
       endeavors on its part to maintain such registration in force.

14.3   Transfer of Flag or Registry

       The Charterer may at any time and from time to time during the Charter
       Period, request that Simon approaches the Owner to transfer the register
       of the Ship to any port and/or to re-document the Ship under laws of any
       jurisdiction other than the port and/or jurisdiction at which the Ship
       is for the time being registered and/or under whose laws the Ship is for
       the time being documented.  If the Owner approves of such transfer of
       register and/or re-documentation of the Ship, Simon shall, at the
       request and for the account of the Charterer (but subject to any
       requirements of the Owner), co-operate with





                                       30
<PAGE>   36
       and permit the Charterer to take all necessary steps within its power to
       comply with such request and thereafter shall during the Charter Period
       co-operate with the Charterer to take such actions as the Charterer may
       reasonably require to maintain the documentation of the Ship at the port
       to which the register of the Ship is so transferred and/or under the
       laws of the jurisdiction under whose laws the Ship is so re-documented.
       For the purposes of this Clause 14.3, the Owner shall be deemed to
       approve the transfer of the register of the Ship to any port of registry
       in the United Kingdom or in any relevant British possession (as that
       expression is defined in section 9 of the Merchant Shipping
       (Registration etc.) Act 1993) and having their principal place of
       business in the United Kingdom or any such possession.

       If, in the reasonable opinion of the Owner it shall become impossible,
       unlawful, impracticable or undesirable for the Owner to maintain the
       documentation of the Ship under the laws of any jurisdiction (other than
       the United Kingdom or any other such relevant British possession) under
       whose laws the Ship is for the time being documented and, the Owner
       shall have given notice thereof to Simon and/or the Charterer, Simon and
       the Charterer shall forthwith enter into negotiations in good faith with
       a view to agreeing with the Owner upon an alternative jurisdiction for
       the documentation of the Ship as a British ship, but if no such
       agreement shall be reached within thirty (30) days after the Owner shall
       have given such notice to Simon neither the Charterer nor Simon shall be
       able to prevent the Owner from re-documenting the Ship as a British ship
       at a port of registry in the United Kingdom or in any other relevant
       British possession and/or to transfer the registry of the Ship to a port
       of registry in the United Kingdom or in any other such relevant British
       possession and in either case the Charterer shall do all that may be
       necessary on its part to give effect to such re-documentation and/or
       transfer of register.  Without prejudice to the generality of the
       provisions of Clause 9, the Charterer shall indemnify and hold harmless
       Simon and the Owner against all losses, costs, expenses and liabilities
       of whatsoever nature (including penalties, claims, demands, orders and
       or judgments) which Simon and the Owner may suffer or incur and which
       arise directly or indirectly out of the documentation of the Ship under
       the laws of any jurisdiction at the request of the Charterer as
       aforesaid.

14.4   Name and House Flag

       (a)    Subject to the prior written consent of the Owner having been
              obtained the name of the Ship shall at the cost of the Charterer
              as soon as possible after the Delivery Date be changed to such
              name as the Charterer shall select (not being a name including
              "Simon" or any other name indicating any continuing relationship
              with Simon or the Simon Engineering plc group of companies) and
              the Ship shall be painted in such colors, display such funnel
              insignia and fly such house flag as the Charterer may require.
              The Charterer shall notify Simon and the Owner of any intended
              change in the name of the Ship.  No future name shall include
              "Simon" or otherwise indicate or imply any continuing
              relationship with Simon or the Simon Engineering plc group of
              companies; and





                                       31
<PAGE>   37
       (b)    Simon will use all reasonable endeavors to procure the consent of
              the Owner to such change of name.

15     Maintenance and Operation

15.1   Possession and Control of Ship by Charterer

       During the Charter Period the Ship shall, subject to the terms and
       conditions of this Charterparty, be in the full and exclusive possession
       and at the absolute disposal of the Charterer for all purposes and under
       its complete control in every respect.

       Notwithstanding any other provision of this Charterparty, without
       prejudice to any of the obligations of the Charterer under this
       Charterparty or any of the other Relevant Documents imposing any higher
       standard of performance upon the Charterer, the Charterer shall make or
       procure to be made, and shall have sole responsibility for making or
       procuring to be made, all such arrangements as may be necessary to
       ensure that the Ship is fit to go to sea without serious danger to human
       life.

15.2   Undertakings concerning Maintenance and Operation

       The Charterer further undertakes with Simon that throughout the Charter
       Period it will:

       (a)    Maintenance of Classification; Compliance with Regulations

              maintain the Classification as the present class of the Ship with
              the Classification Society and with such other certificates
              required by statute and the Ship's insurers in force at all times
              and so as to comply with the provisions of all other regulations
              and requirements (statutory or otherwise) from time to time
              applicable to vessels registered at the Ship's port of registry
              or otherwise applicable to the Ship, her Master, officers and
              crew wherever the Ship may proceed or trade and (without
              prejudice to the generality of the foregoing) at its own expense
              maintain in force for the Ship all safety, radio, loadline and
              other certificates whatsoever and all licenses and permits which
              may from time to time be prescribed by any legislation in force
              in the United Kingdom or other applicable jurisdiction.

       (b)    Supply and Crewing

              ensure that at all times during the Charter Period the Ship is
              properly manned, victualled, navigated, operated, supplied,
              fuelled and repaired;

       (c)    Surveys

              submit the Ship to continuous surveys and such periodical or
              other surveys as may be required for classification purposes,
              comply with all recommendations and





                                       32
<PAGE>   38
              requirements of the Classification Society in accordance with
              their terms and, upon the Owner's or Simon's request supply to
              the Owner or Simon copies of all survey reports issued in respect
              thereof;

       (d)    Repair

              keep the Ship and every part of her in a good and efficient state
              of repair, in efficient operating condition, seaworthy in all
              respects and in accordance with good maintenance practice (fair
              wear and tear excepted and having regard to the type and age of
              the Ship) and procure that all repairs to, or replacement of, any
              damaged, worn or lost parts or equipment are effected in such
              manner (both as regards workmanship and quality of materials) as
              not to diminish the value of the Ship;

       (e)    Drydocking

              drydock the Ship and clean and paint her underwater parts in
              accordance with good commercial practice for vessels of the type
              and age of the Ship;

       (f)    Inspection of the Ship

              permit the Owner and/or Simon by surveyors or other persons
              appointed by them or either of them for such purpose to board the
              Ship at all reasonable times for the purpose of inspecting her
              and to afford all proper facilities for such inspections and for
              this purpose to give the Owner and/or Simon on request reasonable
              advance notice of any intended drydocking of the Ship (whether
              for the purpose of classification, survey or otherwise). The cost
              of any such inspection and survey shall be paid by the Charterer.
              All time taken in respect of such inspection or survey shall form
              part of the Charter Period.  Inspection or survey of the Ship in
              drydock shall be made only when the Ship shall be in drydock for
              the purpose of the surveys referred to in Clause 15.1(e);

       (g)    Manuals and Technical Records

              maintain all such other records, logs, manuals, technical data
              and other materials and documents which are required to be
              maintained in respect of the Ship to comply with any applicable
              laws or the requirements of the Classification Society and, keep
              accurate, complete and up to date logs and records of all voyages
              made by the Ship and of all maintenance, repairs, alterations,
              modifications and additions to the Ship and, on reasonable
              advance notice from the Owner or Simon permit the Owner or Simon
              or their respective representatives at any time to examine and
              take copies of such logs and records and other records;

       (h)    Modification: Removal of Parts: 





                                       33
<PAGE>   39
              Equipment owned by Third Parties

              not without the prior written consent of the Owner and Simon (and
              then only on and subject to such terms as Simon and the Owner may
              agree and, in the case of Simon such consent not to be
              unreasonably withheld or delayed):

              (i)    make any modification to the Ship in consequence of which
                     her structure, type or performance characteristics could
                     or might be materially altered or her value materially
                     reduced; or

              (ii)   remove any material part of the Ship or any equipment the
                     value of which is such that its removal from the Ship
                     would materially reduce the value of the Ship without
                     replacing the same with equivalent parts or equipment
                     which are owned by the Owner free from Encumbrances (other
                     than Permitted Encumbrances); or

              (iii)  install on the Ship any equipment owned by a third party
                     which cannot be removed without causing damage to the
                     structure or fabric of the Ship.

       (i)    Manager

              not without the previous consent in writing of Simon and the
              Owner (which Simon shall not unreasonably withhold or delay) and
              subject to such terms as Simon and the Owner may require
              (including approval of the new manager and the terms of any
              Management Agreement), appoint any manager of the Ship other than
              the Manager or to terminate or amend the terms of the Management
              Agreement (and for the purposes of this Charterparty "manager"
              shall include any ship manager or other person providing to the
              Charterer analogous specialised services in respect of the Ship)

       (j)    Notification of certain Events

              notify Simon and the Owner forthwith by telex of:

              (i)    any damage to the Ship requiring repairs the cost of which
                     will or might exceed the Casualty Amount and furnish Simon
                     and the Owner with full information regarding any single
                     casualty or other accident or damage to the Ship which may
                     involve repairs costing more than the Casualty Amount;

              (ii)   any occurrence in consequence of which the Ship has or may
                     become a Total Loss;

              (iii)  any requisition of the Ship for hire;





                                       34
<PAGE>   40
              (iv)   any requirement or recommendation made by any insurer or
                     the Classification Society or by any competent authority
                     which is not complied with in accordance with its terms;

              (v)    any serious injury to a third party caused by, or in
                     connection with, the Ship;

              (vi)   any substantial damage to property caused by, or in
                     connection with the Ship;

              (vii)  any assistance which has been given to the Ship which has
                     resulted or may result in a lien for salvage being
                     acquired over the Ship; and

              (viii) any other event which occurs in connection with the Ship
                     which affects or might affect the rights of Simon or the
                     Owner or involves any material loss or liability.

       (k)    Repairers' Liens

              not without the previous consent in writing of Simon (which shall
              not be unreasonably withheld but which may be given only on and
              subject to such terms as Simon and/or the Owner may agree) put
              the Ship into the possession of any person for the purpose of
              work being done upon her in an amount exceeding or likely to
              exceed the Casualty amount unless such person shall first have
              given to Simon and the Owner and in terms satisfactory to each
              other, a written undertaking not to exercise any lien on the Ship
              for the cost of such work or otherwise;

       (1)    Health and Safety

              take such steps as are reasonably practicable to ensure that the
              Ship and all constituent parts thereof will be safe and without
              risk to health when properly used and specifically (without
              prejudice to the generality of the foregoing) that it will:

              (i)    take such steps as are reasonably practicable to ensure
                     that any defects in the Ship and all constituent parts
                     thereof which could be or cause a danger to safety and a
                     risk to health shall be made good;

              (ii)   for such purpose, have a detailed inspection of the Ship
                     carried out from time to time including all electrical,
                     fluid, oil and gas connections (being either supplies to
                     or discharges from the Ship) and all constituent parts
                     thereof as well as all life saving and other safety
                     equipment;





                                       35
<PAGE>   41
              (iii)  take such action as is reasonably practicable to see that
                     appropriate safety measures are adopted; and

              (iv)   not use or permit the Ship or any constituent parts
                     thereof to be used beyond their limits and capacities.

       (m)    No Operational Interest

              procure that neither Simon nor the Owner is at any time
              represented as carrying goods or passengers or providing any
              other service on or from the Ship, or as being in any way
              connected or associated with any operation of carriage or other
              service which may be undertaken by the Charterer, or as having
              any operational interest in, or responsibility for, the Ship;

       (n)    Safe Operation

              take all reasonable steps to secure that the Ship is navigated
              and operated in a proper, safe and seaman-like manner; and

       (o)    Fitness to go to Sea

              shall procure that the Ship shall at all times be fit to go to
              sea without serious danger to life (by reason of the condition,
              or the unsuitability for its purpose, of either the Ship or its
              machinery or equipment or any part of the Ship or its machinery
              or equipment or undermanning or overloading or unsafe or improper
              loading or any other matter relevant to the safety of the Ship)
              unless arrangements have been made which are appropriate to
              ensure that before the Ship goes to sea it is made fit to do so
              without serious danger to human life by reason of any such
              matters or it is reasonable for such arrangements not to be made
              at such time.

16     Insurance Undertakings: Wreck Removal and Insurance Assignment

16.1   Insurance Undertakings

       The Charterer hereby covenants with Simon and undertakes that throughout
       the Charter Period and thereafter until sale of Ship pursuant to any
       provision of this Charterparty it will:

       (a)    Insured Risks

              insure and keep the Ship insured free of cost and expense to
              Simon and the Owner and in the joint names of the Charterer,
              Simon and the Owner (but without liability on the part of Simon
              and the Owner for premiums or calls) and, at the request of the
              Charterer, the Manager or other third party providing specialist





                                       36
<PAGE>   42
              services to the Charterer in connection with the operation of the
              Ship (each as their interests may appear):

              (i)    against fire and usual marine risks (including excess
                     risks) and war risks, on an agreed value basis, in such
                     amounts (but not in any event less than whichever shall be
                     the greater of the market value of the Ship for the time
                     being and One hundred and ten per cent (110%) of the
                     Termination Sum applicable during the period of the
                     policy) and upon such terms as shall from time to time be
                     approved in writing by Simon and the Owner;

              (ii)   against protection and indemnity risks (including
                     pollution risks) for the full value and tonnage of the
                     Ship in a protection and indemnity association (as
                     approved in writing by Simon and the Owner) for a full and
                     unlimited entry (other than for oil pollution risks which
                     shall be for a minimum sum of U.S. $500,000,000 or
                     equivalent thereof) and upon such terms as shall from time
                     to time be approved in writing by Simon and the Owner; and

              (iii)  in respect of such other matters of whatsoever nature and
                     howsoever arising in respect of which insurance would be
                     maintained by a prudent owner of the Ship having regard to
                     the financial resources and liabilities of the Charterer
                     and to the situation and method of operation of the Ship;

       (b)    Brokers and Insurers

              effect the insurances aforesaid in Pounds or such other currency
              as Simon and the Owner may approve and through the Approved
              Brokers and with such insurance companies and/or underwriters as
              shall from time to time be approved in writing by Simon and the
              Owner provided however that the insurances against war risks and
              protection and indemnity risks may be effected by the entry of
              the Ship with such war risks and protection and indemnity
              associations as shall from time to time be approved in writing by
              Simon and the Owner;

       (c)    Fleet Cover

              If any of the insurances referred to in Clause 16.1(a) form part
              of a fleet cover, procure that the Approved Brokers and/or
              insurers and protection and indemnity or war risks associations
              (as appropriate) shall undertake to Simon and the Owner that they
              shall neither set off against any claims in respect of the Ship
              any premiums due in respect of other vessels under such fleet
              cover or any premiums due for other insurances, nor cancel the
              insurance for reason of non-payment of premiums for other vessels
              under such fleet cover or of premiums for such other insurances,
              and shall undertake to issue a separate policy in respect of the
              Ship if and when so requested by Simon and/or the Owner;





                                       37
<PAGE>   43
       (d)    Payment of Premiums

              Punctually pay all premiums, calls, contributions or other sums
              payable in respect of all such insurances and to produce all
              relevant receipts or other evidence of payment when so required
              by Simon or the Owner;

       (e)    Renewal

              at least 14 days before the relevant policies, contracts or
              entries expire, notify Simon and the Owner of the names of the
              brokers and/or the war risks and protection and indemnity risks
              associations proposed to be employed by the Charterer for the
              purposes of the renewal of such insurances and of the amounts in
              which such insurances are proposed to be renewed and the risks to
              be covered and, subject to compliance with any requirements of
              Simon and/or the Owner pursuant to this Clause 16.1, procure that
              appropriate instructions for the renewal of such insurances on
              the terms so specified are given to the Approved Brokers and/or
              to the approved war risks and protection and indemnity risks
              associations at least ten (10) days before the relevant policies,
              contracts or entries expire, and that the Approved Brokers and/or
              the approved war risks and protection and indemnity risks
              associations will at least seven (7) days before such expiry (or
              within such shorter period as Simon and/or the Owner may from
              time to time agree) confirm in writing to Simon and the Owner as
              and when such renewals have been effected in accordance with the
              instructions so given;

       (f)    Guarantees

              arrange for the execution and delivery of such guarantees or
              indemnities as may from time to time be required by any
              protection and indemnity or war risks association;

       (g)    Custody of Policy Documents: Letters of Undertaking: Loss Payable
              Clauses

              deposit with the Approved Brokers (or procure the deposit of) all
              slips, cover notes, policies, certificates of entry or other
              instruments of insurance from time to time issued in connection
              with such of the insurances referred to in Clause 16.1(a) as are
              effected through the Approved Brokers and procure that the
              interest of the Owner shell be endorsed thereon by incorporation
              of the relevant Lose Payable Clause and that the Owner shall be
              furnished with pro forma copies thereof and a letter or letters
              of undertaking from the Approved Brokers in such form as shall
              from time to time be required by the Owner;

       (h)    Club Letters of Undertaking: Certificates of Entry





                                       38
<PAGE>   44
              procure that any protection and indemnity and/or war risks
              associations in which the Ship is for the time being entered
              shall endorse the relevant Loss Payable Clause on the relevant
              certificate of entry or policy and shall furnish Simon and the
              Owner with a copy of such certificate of entry or policy and a
              letter or letters of undertaking in such form as shall from time
              to time be required by Simon and the Owner;

       (i)    Broker's Report

              if so requested by Simon or the Owner but at the cost of the
              Charterer (except where the insurances maintained on the Ship
              have not been Changed since the time of the last such report),
              furnish Simon or (as the case may be) the Owner from time to time
              with a detailed report signed by an independent firm of marine
              insurance brokers appointed by the Owner dealing with the
              insurances maintained on the Ship and stating the opinion of such
              firm as to the adequacy thereof;

       (j)    Collection

              do all things necessary and provide all documents, evidence and
              information to enable the Owner and/or Simon to collect or
              recover any moneys which shall at any time become due in respect
              of the Insurances;

       (k)    Compliance with Insurances

              comply with the terms and conditions of the Insurances, not do,
              consent to or permit any act or omission which might invalidate
              or render unenforceable the whole or any part of the Insurances
              and not (without first obtaining the consent of the insurers to
              such employment and complying with such requirements as to extra
              premium or otherwise as the insurers may prescribe) employ the
              Ship or suffer the ship to be employed otherwise than in
              conformity with the terms of the Insurances (including any
              warranties express or implied therein);

       (l)    Application of Recoveries

              apply all sums receivable under the Insurances which are paid to
              the Charterer in accordance with the Loss Payable Clauses and
              Clause 21 in repairing all damage and/or in discharging the
              liability in respect of which such sums shall have been received;

       (m)    Other Insurances and Assureds

              not, without the prior written consent of Simon and the Owner,
              take out additional insurances for the Charterer's sole benefit,
              or permit the Charterer or Simon or the Owner or any other person
              to be named insured in insurances with respect to the





                                       39
<PAGE>   45
              Ship, other than as required under this Charterparty or the
              Conversion and Supply Agreement, where such additional insurances
              will or may prejudice the Insurances or recovery thereunder or
              will exceed the amount permitted by the warranties or other
              conditions of the Insurances (unless the insurers under the
              Insurances have consented thereto) and will upon Simon's or the
              Owner's request, immediately furnish Simon and/or the Owner with
              particulars of any such additional insurances (including copies
              of any cover notes or policies) and of the written consent of the
              insurers under the Insurances in any case where such consent is
              necessary;

       (n)    Information concerning Insurances

              supply to Simon and the Owner all necessary information,
              documentation and assistance which may be required by Simon and
              the Owner in connection with making any claim under the
              Insurances.

       Provided however that if, in the event of requisition of the Ship for
       hire, it is proved to the satisfaction of Simon and the Owner that such
       requisition is upon terms whereby the requisitioning authority has
       assumed the responsibility of the Charterer to Simon and to the Owner to
       indemnify or recompense it in respect of or otherwise to make good all
       losses which would ordinarily be covered by the insurances required to
       be effected by the Charterer under this Charterparty, the Charterer
       shall be relieved from its insurance obligations under this Charterparty
       in respect of such period of requisition or in the event that the
       requisitioning authority shall have assumed only a partial
       responsibility as aforesaid the insurance obligations of the Charterer
       under this Charterparty shall be modified in such manner and to such
       extent as Simon and the Owner may approve, and provided further that in
       this Clause 16, wherever a matter is subject to the approval of the
       Owner and Simon and the Owner and Simon shall not be in complete
       agreement or their respective requirements shall be different then the
       Owner's requirements shall prevail unless, within seven days after
       receiving written notice from the Charterer requiring it to do so, Simon
       shall have demonstrated in writing to the Charterer that Simon's
       interest differs from the interest of the Owner in respect of such
       matter and (subject to any necessary approval or consent of the Owner
       having previously been obtained by Simon) notified the Charterer of its
       requirements and provided that the Charterer can (or ought reasonably to
       have been able to) place the insurance in the open market within seven
       days of notification, the Charterer will then at the Charterer's expense
       take out such additional coverage.

16.2   Wreck Removal

       In the event of the Ship becoming a wreck or obstruction to navigation
       the Charterer shall (in addition to any other obligation it may have
       under Clause 9 to indemnify and hold harmless the Owner and Simon as
       therein provided) indemnity and hold harmless the Owner and Simon
       against all costs, expenses, payments, charges, losses, demands, any
       liabilities, claims, actions, proceedings (whether civil or criminal),
       penalties, fines,





                                       40
<PAGE>   46
       damages, judgments, orders or other sanctions which may be incurred, by,
       or made or asserted against the Owner and/or Simon by reason that the
       Ship shall have become a wreck or obstruction to navigation (including,
       without limitation) in respect of the removal or destruction of the
       wreck or obstruction under statutory powers but only to the extent that
       such has not been recovered from the Ship's insurers.

16.3   Further Requirements

       Notwithstanding the other provisions of this Clause 16, the Charterer
       shall comply with such further reasonable requirements relative to
       insurance (and if applicable any requirements relative to reinsurance)
       as the Owner and/or Simon may from time to time request.

16.4   Insurance Assignment

       As continuing security for the payment of all sums due and payable to
       the Owner by Simon under the Simon Charterparty and by the Charterer to
       Simon under or pursuant to this Charterparty and the other Relevant
       Documents, the Charterer as beneficial owner assigns and agrees to
       assign to the Owner and/or Simon all its right, title and interest in
       and to the Insurances and any Requisition Compensation and agrees and
       undertakes to do all that may be necessary (by way of giving notice,
       lending its name to any action or otherwise howsoever) to enable Simon
       and the Owner to perfect and/or enjoy the full benefits of such
       assignment. Simon shall (subject to the rights of the Owner in respect
       thereof) reassign to the Charterer the property so assigned upon receipt
       by Simon of all such sums and provided the Charter Period shall have
       ended.

17     Powers of Simon and/or the Owner to Remedy Defaults

17.1   Failure to Perform Insurance Undertakings

       If the Charterer fails to comply with any of the provisions of Clause
       16.1, Simon and/or the Owner may, without being in any way obliged so to
       do, or responsible for so doing, and without prejudice to the ability of
       Simon to treat that non-compliance as a Termination Event (but only
       after the expiry of seven days after Simon shall have given the
       Charterer written notice of its requirements where these differ from
       those of the Owner and the second proviso to Clause 16.1 applies), to
       effect and thereafter to maintain all such insurances upon the Ship as
       in its discretion it may think fit in order to procure the compliance
       with such provisions or alternatively, to require the Ship (at the
       Charterer's risk) to remain in, or to proceed to and remain in a port
       designated by Simon until such provisions are fully complied with.

17.2   Failure to Perform Maintenance Undertakings





                                       41
<PAGE>   47
       If the Charterer fails to comply with any of the provisions of Clauses
       15.2(a), (c), (d) or (e), Simon may, without being in any way obliged so
       to do, or responsible for so doing, and without prejudice to the ability
       of Simon to treat that non-compliance as a Termination Event, to arrange
       for the carrying out of such repairs, changes or surveys as it may deem
       expedient or necessary in order to procure the compliance with such
       provisions.

17.3   Failure to Prevent or Release from Arrest

       If the Charterer fails to comply with any of the provisions of Clause
       11.2(d) Simon may, without being in any way obliged so to do, or
       responsible for so doing, and without prejudice to the ability of Simon
       to treat that non-compliance as a Termination Event, pay and discharge
       all such debts, damages, liabilities and outgoings as are therein
       mentioned and/or take any such measures as it may deem expedient or
       necessary for the purpose of securing the release of the Ship in order
       to procure the compliance with such provisions.

17.4   Failure to comply with other Obligations

       If the Charterer fails to comply with any of its other obligations under
       this Charterparty or any of the other Relevant Documents, Simon may,
       without being in any way obliged to do so or responsible for so doing,
       and without prejudice to the ability of Simon to treat that
       non-compliance as a Termination Event take such action as it may deem
       expedient or necessary in order to procure the compliance with such
       provisions.

17.5   Costs of Remedying Defaults

       Without prejudice to Clause 25.1, all losses, liabilities, costs,
       charges, expenses, damages and outgoings of whatsoever nature
       (including, without limitation, Taxes, repair costs, registration fees
       and insurance premiums) suffered, incurred or paid by Simon in
       connection with the exercise by Simon of any of its powers under Clauses
       17.1, 17.2, 17.3 and 17.4 and interest on all such losses, liabilities,
       costs, charges, expenses, damages and outgoings from the date on which
       the same were suffered, incurred or paid by Simon until the date of
       receipt or recovery thereof (both before and after any relevant
       judgment) at the Relevant Rate of Interest shall be repayable by the
       Charterer to Simon on demand.

17.6   Hire Still Payable

       Notwithstanding any exercise by Simon of any of the powers contained in
       this Clause 17, charterhire shall continue to accrue during such time.

18     Redelivery

18.1   Redelivery Procedure and Condition





                                       42
<PAGE>   48
       Except in the event of a Total Loss of the Ship and subject to the
       provisions of Clause 23.5, the Charterer shall at the end of the Charter
       Period redeliver the Ship to Simon free of all Encumbrances (other than
       Permitted Encumbrances), and Simon shall accept such redelivery, at a
       safe port to be mutually agreed between the parties or, in the absence
       of such agreement, at such nearby safe port in the United Kingdom as
       Simon may require.  Subject to the provisions of Clause 23.5, the
       Charterer shall at its expense before such redelivery make all such
       repairs and do all such work as may be necessary so that the Ship at the
       date of redelivery shall have installed the machinery and other
       equipment installed pursuant to the MWB Conversion Contract, or
       replacements for the same made in accordance with the provisions of this
       Charterparty, shall maintain the Classification unexpired and shall be
       in as good structure, state and condition as at Delivery or, fair wear
       and tear and changes and alterations properly made by the Charterer as
       permitted under this Charterparty excepted.

18.2   Redelivery Survey

       At or about the time of redelivery a survey shall, if Simon so requires,
       be made to determine the state and condition of the Ship, her machinery
       and equipment.  In that event, the Charterer and Simon shall each
       appoint surveyors to be present at such survey and the surveyors present
       shall determine the condition of the Ship, her machinery and equipment
       and shall state the repairs or work necessary to place the Ship at the
       date of redelivery in the structure state, condition and classification
       referred to in Clause 18.1.  If the said surveyors disagree they shall
       refer the matter to a senior surveyor of the Classification Society
       whose decision shall be final and binding on the parties hereto.  All
       reasonable costs occasioned by any such survey including the costs of
       the said surveyors appointed by the Charterer and Simon and, if
       appointed, the costs of the senior surveyor of the Classification
       Society shall be payable by the Charterer but if the ship is found to be
       in the condition provided for Clause 18.1 fair wear and tear and changes
       and alterations properly made by the Charterer as permitted under this
       Charterparty excepted, such cost shall be payable by Simon.

19.    Consumable Stores

19.1   Upon Delivery

       All consumable stores on board the Ship at Delivery (including, but not
       limited to, lubricating oils, fuel, water, provisions and stores) shall
       pass to the Charterer without payment therefor by the Charterer to
       Simon.

19.2   Upon Redelivery

       All consumable stores, unused diesel and lubricating oils and bunkers on
       board the Ship at the time of re-delivery shall be purchased by Simon
       from the Charterer and sold by the





                                       43
<PAGE>   49
       Owner to the purchaser of the Ship.  The price payable by Simon to the
       Charterer shall be the same as that received from the said purchaser of
       the Ship.

20.    Use of Equipment and Replacement

20.1   Use of Equipment and Manuals and Technical Records

       The Charterer shall have the use of all outfit, equipment (including
       cabin, crew and galley equipment), furnishings, furniture and fittings,
       spare and replacement parts which are chartered or leased by Simon from
       the Owner on board the Ship at the time of Delivery and the Manuals and
       Technical Records and the Goods and the same or their substantial
       equivalent shall be returned to Simon on redelivery in good order and
       condition fair wear and tear alone and changes and alterations properly
       made by the Charterer as permitted under this Charterparty or the Master
       Lease excepted.

20.2   Renewal of Equipment

       The Charterer shall at its own expense from time to time during the
       Charter Period replace, renew or obtain substitutes for such items of
       equipment as shall be so damaged or worn as to be unfit for use provided
       always that in any such case title to any part replaced, renewed or
       substituted shall remain with the Owner until the part which replaced it
       or the new or substituted part becomes the property of the Owner or is
       replaced, renewed or substituted by a part which thereupon becomes the
       property of the Owner and the Charterer agrees that if any replaced,
       renewed or substituted part is not the property of the Owner it will as
       soon as practicable replace the same with a part which thereupon becomes
       the property of the Owner.

20.3   Alteration of Equipment: Additional Equipment

       The Charterer may at any time alter or remove all or any items of
       equipment or may fit any additional equipment required to render the
       Ship available for any purpose for which the Charterer may require to
       use her under the provisions of Clause 13 provided that the Charterer
       shall first have obtained the prior written consent of Simon (and, where
       appropriate, the Owner) thereto if and to the extent such consent may be
       required pursuant to Clause 15.2(h) (or otherwise).  Notwithstanding any
       other provision of this Charterparty any such equipment which is
       Additional Equipment shall become the property of Simon immediately upon
       its installation (or, where acquired upon leasing terms previously
       agreed between Simon and the Charterer, immediately upon payment out of
       the relevant lease), but be deemed either to be chartered to the
       Charterer pursuant to the terms hereof or leased to the Charterer
       pursuant to the terms of the Master Lease as appropriate, taking into
       account the nature of the equipment and the basis of its installation
       upon the Vessel, at no additional charterhire or rental payment, for the
       Charter Period or until such time as title thereto is transferred to HEL
       pursuant to Clause 5 of the Agreement.  The Charterer shall deliver to
       Simon promptly after acquiring any such equipment which is





                                       44
<PAGE>   50
       Additional Equipment (whether purchased or leased) details of the
       equipment acquired and either (where such equipment is purchased) Bills
       of Sale in respect thereof so as formally to implement such transfer of
       title or (where such equipment is leased) a copy of the relevant lease
       contract or contracts.  The Charterer hereby undertakes that it will if
       required by Simon forthwith upon payment out of the relevant lease or
       leases deliver to Simon Bills of Sale in respect of any such Additional
       Equipment so as to transfer title thereto to Simon.  Unless Simon shall
       otherwise require by notice to the Charterer (except where the Charterer
       shall remove such equipment in accordance with the terms of this
       Charterparty) the Charterer shall not without the prior written consent
       of Simon remove any such equipment as is referred to in this Clause
       20.3.  The cost of fitting or removing any equipment together with the
       cost of making good any damage caused by such fitting or removal shall
       be payable in full by the Charterer who shall redeliver the Ship's
       equipment to Simon in accordance with the provisions of Clause 18.1
       unless it is agrees by Simon that any extra fittings or equipment which
       have been supplied by the Charterer during the Charter Period shall
       remain on the Ship after redelivery to the Owner in which event such
       fittings or equipment shall as from redelivery become the property of
       the Owner.

21     Loss and Damage

21.1   Notwithstanding Clause 6.1, the Ship shall throughout the Charter Period
       be in every respect at the risk of the Charterer who shall bear all
       risks howsoever arising whether of navigation, operation and maintenance
       of the Ship or otherwise and of any other occurrence of whatever kind
       which shall deprive the Charterer of the use, possession or enjoyment
       thereof provided however that nothing in this Clause 21.1 shall restrict
       any claim by the Charterer against Simon for any default of Simon in
       respect of its obligations under Clause 6.1.

21.2   (a)    If the Ship shall become a Total Loss during the Charter Period,
              the Charterer shall pay, or procure that the insurers pay, to the
              Owner within one hundred and twenty (120) days (or such longer
              period as may be agreed between the Owner, Simon and the
              Charterer) of the Total Loss Date, the Termination Sum as at the
              Total Loss Date together with interest thereon calculated at the
              Relevant Rate of Interest from the Total Loss Date to the date of
              payment and together with all amounts of charterhire and any
              other amounts then due and payable under this Charterparty and
              the other Relevant Documents.

       (b)    For the purposes of this Charterparty a Total Loss shall be
              deemed to have occurred on the following date (Total Loss Date):

              (i)    in the rare of an actual total loss, at noon (London time)
                     on the actual date the Ship was lost, or if such date is
                     not known, noon (London time) on the day on which the Ship
                     was last reported;





                                       45
<PAGE>   51
              (ii)   in the case of a constructive total loss of the Ship, upon
                     the date and at the time notice of abandonment of the Ship
                     is given to the insurers of the Ship for the time being
                     (provided a claim for such constructive total loss is
                     admitted by the insurers) or, if the insurers do not admit
                     such a claim, at the date and time at which a constructive
                     total loss is subsequently ad judged by a competent court
                     of law to have occurred;

              (iii)  in the case of a compromised or arranged total loss, at
                     the date upon which a binding agreement as to such
                     compromised or arranged total loss has been entered into
                     by the insurers of the Ship;

              (iv)   in the case of Compulsory Acquisition, upon the date upon
                     which the relevant compulsory acquisition, requisition,
                     appropriation, expropriation, deprivation or confiscation
                     occurs; and

              (v)    in the case of any of the events described in subparagraph
                     (c) of the definition of Total Loss, upon the expiry of
                     the period of thirty (30) days referred to in such
                     sub-paragraph (c) after the date upon which the relevant
                     hijacking, theft, condemnation, confiscation, capture,
                     detention, seizure or requestion for use or hire occurred.

21.3   The Charter Period shall terminate on the Total Loss Date and, subject
       to the payment by the Charterer to Simon of all amounts of charterhire
       then due and payable under this Charterparty, the Charterer shall cease
       to be under any liability to pay charterhire (but not any other amounts)
       thereafter becoming due and payable under this Charterparty or any of
       the other Relevant Documents.

21.4   In the event of the Compulsory Acquisition of the Ship after Delivery,
       all Requisition Compensation received by Simon shall be applied by Simon
       (or, if received by the Charterer, shall be held in trust by the
       Charterer for application) in accordance with Clause 21.5.  Where such
       Requisition Compensation is received by the Owner, Simon shall use all
       reasonable endeavors to procure that the Owner shall apply it in
       accordance with Clause 21.5.

21.5   Simon shall at the cost of the Charterer endeavor to procure that all
       moneys received by the Owner as loss payee under the Insurances from
       insurers or others in respect of a Total Loss shall be applied by the
       Owner subject to Clause 10.4 as follows:

       (a)    the proportion (as calculated by Simon) attributable to the Goods
              shall subject to the rights and obligations of the Owner in
              respect thereof be paid to Simon for application in accordance
              with the terms of the Master Lease; and the balance shall be
              applied:





                                       46
<PAGE>   52
       (b)    Firstly, in or towards settlement of any amounts due and owing by
              the Charterer to Simon under this Charterparty or any of the
              other Relevant Documents other than the Goods Contracts;

       (c)    Secondly, in settlement of all sums due to Simon under the Goods
              Contract insofar as such sums have not been satisfied by
              application of the sums referred to in Clause 21.5(a);

       (d)    Thirdly, if the Charterer shall on or before the date of
              application of such moneys have paid the Termination Sum or a
              part thereof, in accordance with Clause 21.2(a) in or towards
              refunding by way of rebate of hire or otherwise as appropriate to
              the Charterer the amount of the Termination Sum or part thereof
              so paid by the Charterer; and

       (e)    Subject always to the proviso that an amount equal to two per
              cent (2%) of such moneys received by the Owner as loss payee
              under the insurances shall be retained by the Owner, any balance
              shall be paid to the Charterer or to its order by way of rebate
              of Charterhire or otherwise as appropriate.

21.6   In the event of repairable damage to the Ship, Simon shall at the cost
       of the Charterer, use all reasonable endeavors to procure that the Owner
       as loss payee under the Insurances shall pay any insurance moneys
       received by it to the Charterer upon the Charterer furnishing evidence
       to the Owner that such damage has been made good or repaired or put in
       hand for repair Provided always that if a Relevant Event has occurred
       and is continuing, the Owner show be entitled to require that such
       insurance moneys be applied in or towards settlement of any amounts
       owing by the Charterer to Simon under this Charterparty or any of the
       Relevant Documents or by Simon to the Owner under the Simon Charterparty
       or any other of the Simon RBS Documents.

21.7   Any insurance moneys paid under the insurances taken out or entries made
       referred to in Clause 16.1 (a) (ii) shall be paid to the person to whom
       the liability (or alleged liability) covered by such insurances or entry
       was incurred or if the liability (or alleged liability) to such person
       has previously been discharged by the Charterer, Simon shall at the cost
       of the Charterer endeavor to procure that such moneys shall be paid to
       the Charterer in reimbursement of the moneys so expended by it in
       satisfaction of such liability or alleged liability and, in such case
       Simon shall at the cost of the Charterer endeavor to procure that the
       Owner shall pay any insurance moneys received by it in respect of such
       liability or alleged liability to the Charterer upon the Charterer
       furnishing evidence to the Owner that such liability or alleged
       liability has previously been discharged provided always that if a
       Relevant Event has occurred and is continuing, the Owner shall be
       entitled to apply such insurance moneys in or towards settlement of any
       amounts due and owing by the Charterer to the Owner under this
       Charterparty or any of the other Relevant Documents.





                                       47
<PAGE>   53
21.8   In the event of repairable damage to the Ship or a liability or alleged
       liability covered by the insurances taken out or entries mate referred
       to in Clause 16.1(a) being incurred or alleged, and of the insurance
       moneys paid in respect thereof are insufficient to pay the cost or
       estimated cost of making good or repairing such damage or discharging
       the liability or alleged liability, the Charterer will pay the
       deficiency.

21.9   (a)    The Charterer shall have the sole right to determine whether or
              not a case has arisen for the giving of notice of abandonment to
              abandon the Ship to the insurers and/or claim a constructive
              total loss and the Charterer is hereby irrevocably authorised by
              Simon to give the same on behalf of itself and Simon if it so
              determines.

       (b)    Simon shall at the cost of the Charterer endeavor to procure that
              the Owner shall upon the request of the Charterer promptly
              execute such documents as may be required to enable the Charterer
              to abandon the Ship to the insurers and/or claim a constructive
              total loss and Simon shall use all reasonable endeavors to
              procure that the Owner shall give the Charterer all possible
              assistance in pursuing the said claim on behalf of itself and
              Simon.

21.10  Any moneys payable under the Insurances shall be payable in accordance
       with the terms of the relevant Loss Payable Clause and, unless and until
       a Relevant Event shall occur (whereupon all insurance recoveries shell
       be receivable by the Owner and applied in accordance with the foregoing
       provisions of this Clause 21), the Owner shall not give any notice or
       direction to the contrary to the insurers as contemplated by the Loss
       Payable Clauses.

21.11  If the insurers of the Ship have satisfied or admitted in full their
       obligations under the Insurances and have expressly waiver any rights
       they may have, or would or might acquire, in the Ship, Simon shall use
       all reasonable endeavors to procure that the Owner shall as soon as
       practicable after the date of Total Loss of the Ship endeavor to sell
       the Ship, to the extent that the Owner retains title therein.  Any such
       sale shall comply with Clauses 3.5 and 3.6.

22     Salvage

22.1   All salvage and towage and all proceeds from derelicts shall, subject to
       the Owner's prior right to retain thereout any sums which may be due
       from Simon to the Owner under the Simon Charterparty or any of the other
       Relevant Documents, be for the Charterer's benefit and the cost of
       repairing damage occasioned thereby shall be borne by the Charterer.

23     Requisition

23.1   If the Ship is requisitioned for hire by any Government Entity or other
       competent authority during the Charter Period then, unless and until the
       Ship becomes a Total Loss





                                       48
<PAGE>   54
       following such requisition and the Charterer shall have made payment of
       all sums due pursuant to Clause 21.2 (a), the charter of the Ship to the
       Charterer under this Charterparty shall continue in full force and
       effect (subject always to the provisions of Clause 25) for the remainder
       of the Charter Period and the Charterer shall remain fully responsible
       for the due compliance with all its obligations under this Charterparty
       other than such obligations which the Charterer is unable to comply with
       solely by virtue of such requisition.

23.2   If the Charterer shall duly comply with all of its obligations under
       this Charterparty, save as mentioned in Clause 23.1, the Charterer shall
       during the Charter Period, be entitled as between the Charterer and
       Simon to all requisition hire paid to the Owner, Simon or to the
       Charterer on account of such requisition.

23.3   The Charterer shall as soon as practicable after the end of any
       requisition for hire, cause the Ship to be put into the condition
       required by this Charterparty, and where that requisition shall end
       after the expiry or termination of the Charter Period, the Charterer
       shall, as soon as practicable, cause the Ship to be put into the
       redelivery condition required by Clause 18, allowance being made for
       fair wear and tear in respect of the period from the expiry or
       termination of the Charter Period.

23.4   Simon shall be entitled to all compensation payable in respect of any
       change in the structure, state or condition of the Ship arising during
       the period of requisition for hire.  Simon shall apply such compensation
       in reimbursing the Charterer for the cost of complying with its
       obligations under Clause 23.3, provided always that if a Relevant Event
       has occurred and is continuing, Simon shall be entitled to apply such
       compensation in or towards settlement of any amounts owing by the
       Charterer under this Charterparty and any of the other Relevant
       Documents.

23.5   Should the Ship be under requisition for hire at the end of the Chanter
       Period:

       (a)    the charter of the Ship under this Charterparty shall (unless
              otherwise agreed between the parties hereto) nevertheless be
              terminated at such end but without prejudice to the accrued
              rights of the parties, including, without prejudice to the
              generality of the foregoing, the obligations of the Charterer
              contained in Clause 23.3, and (as between the Charterer and
              Simon) Simon shall be entitled to receive and retain any
              requisition hire payable in respect of the period from the expiry
              or termination of the Charter Period;

       (b)    the Charterer shall, if it is prevented by reason of the
              requisition for hire from redelivering the Ship under Clause 18,
              be relieved from its obligations so to do, but shall consult with
              Simon as to the most convenient method of enabling Simon to
              obtain redelivery of the Ship when the Ship is released from such
              requisition; and





                                       49
<PAGE>   55
       (c)    after such release the Charterer shall be given a reasonable
              opportunity of removing any additional equipment as is referred
              to in Clause 20.3 on the terms therein referred.

23.6   If the Ship shall be requisitioned for hire upon terms whereby the
       Charterer is not relieved from its insurance obligations pursuant to the
       proviso to Clause 16.1, insurance recoveries in respect of all claims
       whatsoever (otherwise than in respect of a Total Loss) arising during
       the period or requisition shall (to the extent to which such recoveries
       have not been expended by the Charterer in repairs to the Ship) at the
       end of the Charter Period be paid to the Owner and in respect of any
       amount so paid the Charterer shall to that extent be relieved from its
       obligations under the last sentence of Clause 18.1 and under Clause
       20.3.

24.    Termination Events

24.1   If the Charterer commits a repudiatory breach of any Relevant Document
       or any Guarantor commits a repudiatory breach of the Guarantee Simon may
       accept such breach as repudiation of this Charterparty.

24.2   Without prejudice to the generality of Clause 24.1, Simon and the
       Charterer agree that it is a fundamental term and condition of this
       Charterparty that none of the following events shall occur during the
       Charter Period and that the occurrence of any of the following events
       shall constitute a repudiatory breach of this Charterparty

       (a)    any Relevant Party fails to pay any sum payable by it under any
              of the Relevant Documents when due or on demand within two (2)
              Banking Days of such due date or date of demand (as the case may
              be) or

       (b)    the Charterer falls to obtain and/or maintain the Insurances or
              if any insurer in respect of any part of the Insurances cancels
              any part of the Insurances or disclaims or repudiates liability
              by reason, in either case, of any misstatement in any proposal
              for the Insurances or for any other failure or default on the
              part of the Charterer; or

       (c)    any Relevant Party commits any breach of or omits to observe any
              of the obligations or undertakings expressed to be assumed by it
              under any of the Relevant Documents (other than those referred to
              in sub-clauses (a) and (b) above) and in respect of any such
              breach or omission which in the opinion of Simon is capable of
              remedy, such action as Simon may require shall not have been
              taken within fourteen (14) days of Simon notifying any Relevant
              Party of such default and of such required action;

       (d)    any representation or warranty made or deemed to be made or
              repeated by any Relevant Party in or pursuant to any of the
              Relevant Documents or any document, certificate or statement
              referred to in or delivered under any of the Relevant





                                       50
<PAGE>   56
              Documents is or proves to have been incorrect in any material
              respect when made or deemed repeated; or

       (e)    any Indebtedness of any Relevant Party becomes due or capable of
              being declared due prior to the date when it would otherwise have
              become due whether or not such breach or default shall be waived
              by the person to whom the same is payable or is not paid on the
              due date and in the opinion of Simon the ability of any Relevant
              Party to perform all or any of its obligations under, or
              otherwise to comply with the terms of any Relevant Documents
              shall or may reasonably be expected to be materially adversely
              prejudiced as a consequence thereof; or

       (f)    any consent, authorisation, license or approval of or
              registration with or declaration to governmental or public bodies
              or authorities or courts required by any Relevant Party to
              authorise, or required by any Relevant Party in connection with,
              the execution, delivery, validity, enforceability or
              admissibility in evidence of any of the Relevant Documents or the
              performance by any Relevant Party of its obligations under any of
              the Relevant Documents is modified in a manner unacceptable to
              Simon or is not granted or is revoked or terminated or expires
              and is not renewed or otherwise ceases to be in full force and
              effect; or

       (g)    a creditor attaches or takes possession of, or a distress,
              execution, sequestration or other process is levied or enforced
              upon or sued out against any of the undertakings, assets, rights
              or revenues of any Relevant Party and is not discharged within
              seven days; or

       (h)    any Relevant Party (other than Horizon Seismic Inc., where it is
              affected by any of the following events or circumstances only as
              a result of litigation successfully prosecuted against it)
              suspends payment of its debts or becomes or is deemed to be
              insolvent or unable to pay its debts within the meaning of
              Section 123 of the Insolvency Act 1986 as they fall due or
              commences negotiations with one or more of its creditors with a
              view to the general re-adjustment or re-scheduling of all or part
              of its Indebtedness or proposes or enters into any composition or
              other arrangement for the benefit of its creditors generally or
              any class of creditors or proceedings are commenced in relation
              to any Relevant Party under any law, regulation or procedure
              relating to reconstruction or readjustment of debts; or

       (i)    any Relevant Party takes any action or any legal proceedings are
              started or other steps taken for (or for the consideration of)
              (i) any Relevant Party to be adjudicated or found bankrupt or
              insolvent, (ii) the winding-up or dissolution of any Relevant
              Party or (iii) the appointment of a liquidator, trustee,
              receiver, administrator or similar officer of any Relevant Party
              of the whole or any part of their respective undertakings,
              assets, rights or revenues; or





                                       51
<PAGE>   57
       (j)    any event occurs or proceeding is taken with respect to any
              Relevant Party in any jurisdiction to which it is subject which
              has an effect equivalent or similar to any of the events
              mentioned in Clauses 24.2 (g), (h) or (i); or

       (k)    any Relevant Party suspends or ceases or threatens to suspend or
              cease to carry on its business; or

       (l)    all or a material part of the undertakings, assets, rights or
              revenues of or shares or other ownership interests in, any
              Relevant Party are seized, nationalised, expropriated or
              compulsorily acquired by or under the authority of any
              government; or

       (m)    any Relevant Party disposes or threatens to dispose of all or a
              material part of its assets, whether by one or a series of
              transactions, related or not, other than for the purpose of a
              reconstruction or amalgamation the terms of which have received
              the previous consent in writing of Simon; or

       (n)    there occurs, in the reasonable opinion of Simon, a material
              adverse change in the financial condition of the Charterer or any
              Guarantor by reference to the financial statements referred to in
              Clause 2.1(f) of this Charterparty and Clause 5.1(i) of the
              Guarantee respectively; or

       (o)    any of the Relevant Documents at any time and for any reason is
              or becomes invalid or unenforceable or otherwise ceases to remain
              in full force and effect, or the validity or enforceability of
              any of the Relevant Documents at any time and for any reason is
              contested by any party thereto (other than Simon), or any such
              party denies that it has any, or any further, liability
              thereunder or it becomes impossible or unlawful for the Charterer
              or any other Relevant Party to fulfil any of its covenants and
              obligations contained in any of the Relevant Documents; or

       (p)    any Relevant Party repudiates any of its obligations under the
              Relevant Documents or does or causes or permits to be done any
              act or thing evidencing an intention to repudiate any of its
              obligations under the Relevant Documents; or

       (q)    the Ship is arrested, confiscated, seized, taken in execution,
              impounded, forfeited, detained in exercise or purported exercise
              of any possessory lien or other claim, or otherwise taken from
              the possession of any Relevant Party or any operator thereof
              other than pursuant to a breach of Clause 6.1 by Simon, as a
              result of any Encumbrance directly created by Simon which
              adversely affects the operation of the Ship and any Relevant
              Party shall fail to procure the release of the Ship at the
              earliest possible time and in any event within a period of
              fourteen (14) days; or





                                       52
<PAGE>   58
       (r)    the registration of the Ship is cancelled or terminated
              (otherwise than upon the Ship being redocumented or its
              registration transferred as contemplated by Clause 14.3) except
              by reason of Simon's default in its obligations under Clause
              14.2; or

       (s)    any other event (other than a Total Loss) occurs or state of
              affairs exists which has or may reasonably be expected to have a
              prejudicial effect on Simon's or the Owner's title to the Ship
              (other than pursuant to a breach of Clause 6.1 by Simon or the
              Owner as a result of any Encumbrance directly created by Simon or
              the Owner which adversely affects the operation of the Ship) or a
              prejudicial effect on its rights under any of the Relevant
              Documents, or an adverse effect on the ability of any Relevant
              Party to perform all or any of its obligations under, or
              otherwise to comply with the terms of, any of the Relevant
              Documents; or

       (t)    in the "requisite period", the Ship shall be used for any purpose
              other than a "qualifying purpose" as those expressions are
              described in Clause 13.2(e); or

       (u)    there shall occur a material adverse change, from the position
              applicable immediately following Delivery, in the business,
              affairs or condition (financial or otherwise) of any Relevant
              Party the effect of which is (in the reasonable opinion of Simon)
              materially to imperil, delay or prevent the due fulfillment by
              any Relevant Party of any of their obligations and undertakings
              contained in any of the Relevant Documents; or

       (v)    except with the prior written consent of Simon less than the
              whole, or none, of the legal and beneficial ownership of the
              issued share capital of the Charterer shall be owned, directly or
              indirectly, by Exploration Holdings Limited.

25     Simon's Rights Following a Termination Event

25.1   At any time after any repudiation of this Charterparty by the Charterer,
       including the occurrence of any Termination Event (and provided that the
       same is continuing) Simon may, by notice to the Charterer, accept such
       repudiation and immediately terminate the Charter Period (whereupon, as
       the Charterer hereby agrees and acknowledges, the Charterer's right,
       title and interest in and to the Ship and to possess and operate the
       Ship, shall terminate) and retake possession of the Ship, (the Charterer
       agreeing, in such circumstances, that Simon shall be entitled to retain
       as part of the Ship (as between itself and the Charterer), any and all
       equipment belonging to the Charterer (but not any such equipment as may
       be leased from third parties who are not Relevant Parties or the Owner)
       installed in or on the Ship (whether such equipment shall have been
       installed pursuant to Clause 20.3 or otherwise, if for any reason title
       thereto shall remain with the Charterer), and the Charterer agrees that
       Simon may for this purpose enter upon any premises belonging to or in
       the occupation or under the control of the Charterer where the Ship or
       any part thereof may be located, and the Charterer shall pay to Simon
       forthwith upon such termination such sum as shall equal the aggregate
       of:





                                       53
<PAGE>   59
       (a)    all amounts due under the Charterparty or any of the other
              Relevant Documents as shall be payable and remain outstanding;

       (b)    all losses incurred by Simon in connection with such termination
              including, without prejudice to the generality of the foregoing,
              all costs and expenses so incurred in recovering possession of
              the Ship, and in carrying out any works or modifications required
              to bring the Ship up to the condition specified in Clause 18.1;

       and the Charterer shall also pay to Simon forthwith upon such
       termination by way of agreed compensation and not as a penalty, the
       amount of the Termination Sum at the date of termination.

25.2   Without prejudice to the obligation of the Charterer to make the
       payments referred to in Clause 25.1, upon any such termination as is
       referred to in Clause 25.1 and provided that Simon shall not be
       prevented from so doing for any reason whatsoever, Simon may (but shall
       not be obliged to) elect (with the prior written consent of the Owner)
       to endeavor to sell the Ship as soon as practicable.  The Net Sale
       Proceeds from any such sale shall be applied by Simon subject to Clause
       10.4 as follows:

       (a)    the proportion of the Net Sale Proceeds attributable to the Goods
              shall be calculated and subject to the rights and obligations of
              the Owner in respect thereof paid to Simon for application in
              accordance with the terms of the Master Lease; and the balance
              shall be applied:

       (b)    Firstly, in or towards settlement of any amounts due and owing by
              the Charterer to Simon under this Charterparty or any of the
              other Relevant Documents other than the Goods Contracts
              (including any interest due in respect thereof);

       (c)    Secondly, in settlement of all sums due to Simon under the Goods
              Contracts insofar as such sums have not been satisfied by
              application of the sums referred to in Clause 25.2(a);

       (d)    Thirdly, if the Charterer shall on or before the date of
              application of the Net Sale Proceeds by Simon have paid the
              Termination Sum, or a part thereof, in accordance with Clause
              25.1, in or towards refunding by way of rebate of charterhire or
              otherwise as appropriate to the Charterer the amount of the
              Termination Sum or part thereof so paid by the Charterer

       PROVIDED THAT an amount equal to two per cent (2%) of the Net Sale
       Proceeds shall be retained by the Owner.

25.3   If the Charterer fails to comply with any of its obligations under this
       Charterparty or any of the other Relevant Documents Simon may, without
       being in any way obliged so to do,





                                       54
<PAGE>   60
       or responsible for so doing, and without prejudice to the ability of
       Simon to treat that non-compliance as a Termination Event, effect
       compliance on the Charterer's behalf, and if Simon incurs any
       expenditure in effecting such compliance Simon shall be entitled
       (without prejudice to Clause 25.1) to recover such expenditure from the
       Charterer together with interest thereon at the Relevant Rate of
       Interest from the date on which such expenditure is incurred by Simon
       until the date of reimbursement thereof by the Charterer (both before
       and after any relevant judgment).

25.4   The rights and remedies of Simon provided in this Charterparty are
       cumulative and are not exclusive of any rights and remedies provided by
       law.

26     Increased Costs, Funding Problems and Illegality

26.1   If the Owner notifies Simon that adequate and fair means do not exist
       for calculating the variable portion of the charterhire then Simon shall
       give notice thereof to the Charterer and Simon and the Charterer shall
       meet together with the Owner to discuss the matter in good faith and,
       unless within thirty (30) days of the giving of such notice the Owner,
       Simon and the Charterer arrive, by negotiation in good faith, at an
       alternative basis acceptable to each of them for continuing the Owner's
       funding of its purchase of the Ship and/or continuing the chartering of
       the Ship by the Owner to Simon and calculating the variable portion of
       charterhire (and any alternative basis agreed in writing shall be
       retroactive to and effective from the commencement of the relevant
       period and shall continue until the Owner determines that circumstances
       are such that such alternative basis may cease to be effective) the
       Charterer shall indemnify Simon from and against all liability, loss or
       expense suffered or incurred by Simon during the relevant period
       (provided that Simon shall take all reasonable steps as may be open to
       it to mitigate the effect of this Clause) and charterhire shall be
       adjusted as provided and for so long as shall apply pursuant to Clause
       26.1 of the Simon Charterparty.

26.2   If any law, regulation or regulatory requirement or any judgment, order
       or direction of any court, tribunal or authority binding upon Simon in
       the jurisdiction in which it is formed or in which any action is
       required to be performed by it for the purposes of any of the Relevant
       Documents (whether or not in force before the date of this Charterparty)
       renders it unlawful for Simon to continue to charter the Ship to the
       Charterer under this Charterparty or for the Owner to continue to
       charter the Ship to Simon under the Simon Charterparty, Simon shall
       promptly inform the Charterer and Simon and the Charterer shall both be
       entitled by written notice to the other to terminate the Charter Period.
       Such termination shall be deemed to be a voluntary termination of the
       Charter Period in accordance with Clause 3.3 (notwithstanding that such
       termination shall not have occurred on a date falling on or after the
       first (1st) anniversary of the Delivery Date or that Simon shall not
       have received two hundred and ten (210) days' notice thereof) and the
       provisions of Clauses 3.3 to 3.5 shall apply thereto.

27     Notices





                                       55
<PAGE>   61
27.1   Every notice, request, demand or other communication under this
       Charterparty shall:

       (a)    be in writing delivered personally or by prepaid first class
              letter, telex or facsimile transmission (confirmed in the case of
              a telex or facsimile transmission, by prepaid first class letter
              sent within 24 hours of despatch but so that the non-receipt of
              such confirmation shall not affect in any way the validity of the
              telex or facsimile transmission in question);

       (b)    be deemed to have been received, subject as otherwise provided In
              this Charterparty, in the case of a telex, at the time of
              despatch with confirmed answerback of the addressee appearing at
              the beginning and end of the communication, in the case of a
              facsimile translation, at the time of despatch with confirmation
              that the communication was well received (Provided that, in the
              case of a telex or facsimile transmission, if the date of
              despatch is not a business day in the country of the addressee it
              shall be deemed to have been, received at the opening of business
              on the next such business day), and in the case of a letter, when
              delivered personally or five (5) days after being put in the
              post;

       (c)    be sent:

              (1)    to Simon:

                     Simon-Horizon Limited
                     Horizon House
                     Azalea Drive
                     Swanley
                     Kent BR8 8JR
                     Telex: 8960SO EXPLOR G
                     Fax: 0322 613650
                     (Attention: Company Secretary)

                     and copied to:

                     Simon Engineering plc
                     Simon House
                     Bird Ball Lane
                     Stockport
                     Cheshire SK3 ORT
                     Telex: 665923 SIKENG G
                     Fax: 061 491 2472
                     (Attention: Company Secretary)

              (2)    to the Charterer:





                                       56
<PAGE>   62
                     Horizon Exploration Limited
                     6 Pembroke Road
                     Sevenoaks Kent TN13 1XR
                     Telex: 957840 EXPLOR G
                     Fax: 0732 742977
                     (Attention: Company Secretary)

              or to such other address, telex number or facsimile number as is
              notified by one party to the other under this Charterparty.

28     Assignment

28.1   Save as hereinafter provided, neither Simon nor the Charterer may assign
       or otherwise transfer any of its rights or obligations under this
       Charterparty without the prior written consent of the other party hereto
       PROVIDED ALWAYS that Simon may with the consent of the Owner assign or
       otherwise transfer any or all of its rights under, and the benefit of,
       this Charterparty without the consent of the Charterer, except that
       Simon shall not without the prior written consent of the Charterer (such
       consent not to be unreasonably withheld or delayed) so assign or
       otherwise transfer any or all of such rights and benefit to an assignee
       who is a business competitor of the Charterer (which shall, for the
       purposes hereof have the same meaning as "Business Competitor of HEL" as
       defined in the Agreement).  In the event of any such assignment or
       transfer by Simon, such assignment or transfer shall not impose any
       greater liabilities on the Charterer at the date of completion thereof
       towards Simon than those liabilities which the Charterer would have had
       to Simon had no such assignment or transfer taken place.

29     Miscellaneous

29.1   This Charterparty contains the entire agreement between Simon and the
       Charterer relating to the chartering of the Ship, and the terms and
       conditions of this Charterparty shall not be varied otherwise than by an
       instrument in writing of even date herewith or subsequent hereto
       executed by or on behalf of Simon and the Charterer.

29.2   No failure or delay on the part of Simon in exercising any right, power
       or remedy under this Charterparty shall operate as a waiver thereof nor
       shall any single or partial exercise by Simon of any such right, power
       or remedy preclude any other or further exercise thereof or the exercise
       of any other right, power or remedy.  The remedies provided in this
       Charterparty are cumulative and are not exclusive of any remedies
       provided by law.

29.3   Subject to the periods of grace referred to in Clause 24, time shall be
       of the essence as regards the performance by the Charterer of its
       obligations under this Charterparty.

29.4   All rights and liabilities in respect of the Ship by way of General
       Average shall be for the account of the Charterer.





                                       57
<PAGE>   63
29.5   If any term or provision of this Charterparty or any of the other
       Relevant Documents or the application thereof to any person or
       circumstances shall to any extent be invalid or unenforceable, the
       remainder of this Charterparty and the other Relevant Documents or
       application of such term or provision to persons or circumstances (other
       than those as to which it is already invalid or unenforceable) shall not
       be affected thereby and each term and provision of this Charterparty and
       the other Relevant Documents shall be valid and be enforceable to the
       fullest extent permitted by law.

29.6   The Charterer authorises Simon without prejudice to any of Simon's
       rights of set-off at law, in equity or otherwise, at any time and with
       notice to the Charterer to set off or withhold from any sum or sums
       expressed in this Charterparty or one of the other Relevant Documents to
       be payable to the Charterer by Simon any amount due and payable to Simon
       from the Charterer under this Charterparty or any of the other Relevant
       Documents.  For any such purpose Simon is authorised to purchase with
       the sums which would but for this Clause 29.6 be so payable to the
       Charterer, such other currencies as may be necessary to effect such set
       off or withholding.  Simon shall not be obliged to exercise any right
       given to it by this Clause 29.6.  Simon shall notify the Charterer
       forthwith upon the exercise or purported exercise of any right of
       set-off or withholding full details in relation thereto.

29.7   The Charterer undertakes that it will at its expense execute, sign,
       perfect and do any and every such further assurance, document, act or
       thing as in the reasonable opinion of Simon may be necessary or
       desirable to carry out the purpose of this Charterparty or any of the
       other Relevant Documents or protect or enforce any right of Simon
       hereunder or thereunder or the title of Simon or the Owner in the Ship.

29.8   In the event of any conflict between this Charterparty and any of the
       other Relevant Documents, the provisions of this Charterparty shall
       prevail.

30     Law

30.1   This Charterparty is governed by and shall be construed in accordance
       with English law.


IN WITNESS whereof the parties hereto have entered into this Charterparty the
day and year first above written.





                                       58
<PAGE>   64
                                   SCHEDULE 1

                         List of Documents and Evidence

1.     A copy certified by a Director or the Secretary of the relevant person
       to be a true, complete and up-to-date copy, of the Certificate of
       Incorporation and Memorandum and Articles of Association of the
       Charterer and each of the Relevant Parties.

2.     A copy, certified by a Director or the Secretary (or similar officer) of
       the relevant person to be a true copy, and as being in full force and
       effect and not amended or rescinded, of resolutions of the board of
       directors of each of the Charterer and the other Relevant Parties:

       (i)    approving the transactions contemplated by such of the Relevant
              Documents to which the relevant person is a party;

       (ii)   authorising a person or persons to sign and deliver on behalf of
              the relevant person or, as the case may be, authorising the
              sealing by the relevant person of the Relevant Documents to which
              it is a party and any notices or other documents to be driven
              pursuant thereto.

3.     A copy certified by a Director or the Secretary (or similar officer) of
       the relevant person to be a true copy, and as being in full force and
       effect and not revoked or withdrawn, of any power of attorney issued by
       the relevant person pursuant to the said resolutions.

4.     A list, certified as true, complete and up to date by a Director or the
       Secretary (or similar officer) of each of the Relevant Parties of its
       directors and officers.

5.     Evidence that all governmental and other licenses, approvals, consents,
       registrations and filings necessary for any matter or thing contemplated
       by the Relevant Documents and for the legality, validity,
       enforceability, admissibility in evidence and effectiveness thereof have
       been obtained or effected on an unconditional basis and remain in full
       force and effect (or, in the case of effecting of any registrations and
       filings, that arrangements satisfactory to Simon have been made for the
       effecting of the same within any applicable time limit).

6.     Evidence that, on Delivery, the Ship is and will remain insured in
       accordance with the provisions of this Charterparty and all requirements
       of this Charterparty in respect of such insurance have been complied
       with.


7.     Evidence that on delivery, the Goods will be insured in accordance with
       the provisions of the Master Lease and all requirements of the Master
       Lease in respect of such insurance have been complied with.





                                       59
<PAGE>   65
8.     The Agreement duly executed by the Charterer.

9.     The Guarantees duly executed by the Guarantors.

10.    An Assignment Agreement between Simon and the Charterer in respect of
       the Management Agreement.

11.    Such legal opinions as Simon may require in relation to the laws of any
       jurisdiction to which any Relevant Party is or may be subject or which
       may affect the perforce of the obligations of any Relevant Party.





                                       60
<PAGE>   66
                                   SCHEDULE 2

Excluded Equipment, Retained Equipment and Additional Equipment


Part I        EXCLUDED EQUIPMENT

       1      Herringbone System
    64        TI Sleeve Guns
       2      Umbilical Winches, MPD
       2      Umbilical Winches, low pull, MPD
       4      Slipring Units
       4      Stowing Winches
       1      Air Conditioning Unit, Instrument Room
       1      Streamer Reel, MPD
       1      Litton Streamer, 20 Sections
    36        Syntrak Digitising Modules
       1      Uninterruptible Power Supply Unit 1040 S/25
       1      Uninterruptible Power Supply Unit AST 3350/380/60
       1      Umbilical Reel, accessories, scrivers
       4      Hamworthy Compressors 4TH 565W 100
       1      Lasertrak System


PART II       RETAINED EQUIPMENT

       1      IBM RS 6000/370W/128Mb
       4      IBM Disc Drives & Enclosure
       2      IBM Disc Drives Internal
       1      IBM Exabyte Tape Drive
       2      Fujitsu Cartridge Tape Controller
       3      Fujitsu Tape Streamer & Autoloader
       3      Power Supply Unit
       1      Laser Printer, QMS PS815
       1      Colour Monitor, Keyboard, Mouse
              SCSI Controllers, Planers, Graphics Adapter, Plotter Board,
              Sterling Card


PART III      ADDITIONAL EQUIPMENT

              Digicourse Acoustic System          US$750,000
              3D Binning System                   US$200,000





                                       61
<PAGE>   67
                                   SCHEDULE 3

                                  Charterhire


1      Definitions

1.1    In addition to the definitions comprised in Clause 1 and Schedule 4 of
       this Charterparty the following expressions shall have the following
       meanings:

       "Accounting Period"             means an accounting period for the
                                       purposes of section 12 ICTA;

       "Applicable Rate"               means in relation to any Interest
                                       Reference Period where the Applicable
                                       Rate is being applied to a negative
                                       balance of Notional Capital Outstanding,
                                       the greater of (i) LIBOR for that period
                                       and (ii) 7 per cent per annum, in either
                                       case, plus the Reserve Asset Rate for
                                       that period;

       "Assumptions"                   means the assumptions set out in
                                       paragraph 3 of this Schedule 3;

       "Corporation Tax
           Applicable Rate"          means in relation to any Accounting Period
                                     of the Owner, the effective rate of
                                     Corporation Tax which is or would be
                                     applicable to companies generally in
                                     respect of taxable profits (if there were
                                     such profits and ignoring for this purpose
                                     the special rate applicable to small
                                     companies) of such Accounting Period, such
                                     rate to be a weighted average calculated
                                     on a time apportionment basis where
                                     different rates apply for more than one
                                     Financial Year within which such
                                     Accounting Period falls.  Without
                                     prejudice to the foregoing, if, at any
                                     date on which a calculation is to be made
                                     hereunder, the Corporation Tax rates are
                                     fixed retrospectively or for some other
                                     reason the relevant rate is not known at
                                     the time, such calculation shall (without
                                     prejudice to any provision of this
                                     Schedule providing for such calculation to
                                     be adjusted





                                       62
<PAGE>   68
                                       once the rate of Corporation Tax is
                                       fixed by law) be made on the basis that
                                       the rate of Corporation Tax last fixes
                                       will not change;

       "Final Date"                    means the date falling nine months and
                                       one day after the last day of the
                                       Accounting Period of the Owner in which

                                       (i)   the last Primary Period
                                             Charterhire (or any adjustment
                                             thereto) falls due to be paid; or

                                       (ii)  any Termination Sum (or any
                                             adjustment thereto) falls due to
                                             be paid;

                                       whichever is later;

       "Financial Year"                has the meaning given to that expression
                                       in Schedule 1 of the Interpretation Act
                                       1978;

       "Interest Payment Date"         means, for any Interest Reference
                                       Period, the date specified in respect
                                       thereof in Column 2 of the table annexed
                                       to this Schedule 3, or if any such date
                                       is not a Banking Day, the immediately
                                       preceding Banking Day;

       "Interest Reference
           Period"                     means each of the following successive
                                       periods:

                                       (i)   the period commencing on 1st
                                             April, 1991 and ending on 30th
                                             June, 1991, and thereafter each
                                             successive period of three (3)
                                             months commencing on the date
                                             specified in Column 1 of the table
                                             annexed to this Schedule 3 and
                                             ending on the day immediately
                                             preceding the first day of the
                                             next Interest Reference Period;
                                             and

                                       (ii)  the period from the expiry of the
                                             last three (3) month period
                                             referred to in (1) above to the
                                             Final Date;





                                       63
<PAGE>   69
       "LIBOR"                         means in relation to any Interest
                                       Reference Period, the annual percentage
                                       rate of interest (as certified by The
                                       Royal Bank of Scotland plc whose
                                       certificate shall in the absence of
                                       manifest error be conclusive and
                                       binding) at which deposits in Pounds for
                                       the period in question in amounts
                                       comparable with the sum in respect of
                                       which such interest rate falls to be
                                       determined were offered by The Royal
                                       Bank of Scotland plc to prime banks in
                                       the London Interbank Market at or about
                                       11.00 a.m. on the first day of such
                                       period or, if such day is not a Banking
                                       Day then on the immediately preceding
                                       day which is a Banking Day;

       "Notional Capital
          Outstanding"                 means the amount of the Owner's
                                       investment in the Charterparty from time
                                       to time;

       "Owner's Group"                 means all those companies which at any
                                       particular time constitute a group of
                                       companies for the purposes of the
                                       provisions relating to group relief
                                       contained in Chapter IV Part X ICTA and
                                       of which the Owner is a member;

       "Owner's Return"                means the Owner's after-tax profit take
                                       out rate of return;

       "Pre-Primary
          Applicable Rate"             means in relation to any Pre-Primary
                                       Interest Reference Period where the
                                       Pre-Primary Applicable Rate is being
                                       applied to a negative balance of
                                       Notional Capital Outstanding, the
                                       greater of (i) Pre-Primary LIBOR for
                                       that period and (ii) 7 per cent per
                                       annum, in either case, plus the Reserve
                                       Asset Rate for that period;

       "Pre-Primary Interest
          Payment Date"                means each of 31st December 1990 and
                                       31st March 1991;


       "Pre-Primary Interest
          Reference Period"            means each of the following successive
                                       periods:





                                       64
<PAGE>   70
                                   (i)       the period commencing on the
                                             "Delivery Date" (which, for the
                                             purposes of this and the two next
                                             following definitions means
                                             "Delivery Date" as defined for the
                                             purpose of the Simon Charterparty)
                                             and ending on 31st December 1990;

                                   (ii)      the period commencing on the
                                             expiry of the period referred to
                                             in (i) above and ending on the
                                             date three (3) months thereafter;

       "Pre-Primary LIBOR"         means, in relation to any Pre-Primary
                                   Interest Reference Period, the annual
                                   percentage rate of interest (as certified by
                                   The Royal Bank of Scotland plc whose
                                   certificate shall in the absence of manifest
                                   error be conclusive and binding) at which
                                   deposits in Pounds for a period of one month
                                   in amounts comparable with the sum in
                                   respect of which such interest rate falls to
                                   be determined were offered by The Royal Bank
                                   of Scotland plc to prime banks in the London
                                   Interbank Market at or about 11.00 a.m. on
                                   the first day of such period or, if such day
                                   is not a Banking Day then on the immediately
                                   preceding day which is a Banking Day;

       "Pre-Primary Period"        means the period commencing on the "Delivery
                                   Date" and ending on the last day of the last
                                   Pre-Primary Interest Reference Period;

       "Primary Period
          Charterhire"             means the charterhire calculated and payable
                                   in accordance with paragraph 2 of this
                                   Schedule 3 and, where applicable, as
                                   adjusted in accordance with paragraph 4 of
                                   this Schedule 3;
                                 
       "Reference Rate"            means thirteen (13) per cent per annum;





                                       65
<PAGE>   71
       "Reserve Asset Rate"      means for any period the annual percentage
                                 rate of interest derived from the following
                                 formula:

                                 CL+D(L-X)+(M-D)(L-T)+S(L-Z)% per annum

                                             100-(C+S+M)

                                 Where

                                 C =   The amount required to be held on
                                       non-operational non-interest bearing
                                       deposit account with the Bank of England
                                       pursuant to the Cash Ratio deposit
                                       requirement of the Bank of England,
                                       expressed as a percentage of The Royal
                                       Bank of Scotland plc's Eligible
                                       Liabilities (the "Cash Ratio Deposit")

                                 L =   LIBOR

                                 D =   The amount required to be held on
                                       secured Loans to members of the London
                                       Discount Market Association and/or on
                                       secured call Loans with those money
                                       brokers and gilt-edged primary market
                                       makers recognised for this purpose by
                                       the Bank of England, expressed as the
                                       normal average percentage of The Royal
                                       Bank of Scotland plc's Eligible
                                       Liabilities to be so maintained
                                       ("Discount House Deposits")

                                 X =   The rate of interest per annum at which
                                       Sterling deposits can be places on
                                       secured Loan with a member of the London
                                       Discount Market Association at or about
                                       11.00 on the relevant day for a period,
                                       comparable to the relevant Interest
                                       Reference Period or for three months,





                                       66
<PAGE>   72
                                       whichever is the shorter. ("Discount
                                       House Deposit Rate")

                                 M =   The amount required by the Bank of
                                       England to be maintained in specific
                                       liquid assets, expressed as the normal
                                       average percentage of The Royal Bank of
                                       Scotland plc's Eligible Liabilities to
                                       be so maintained ("Mandatory Liquid
                                       Assets")

                                 T =   The yield on Treasury Bills having a
                                       period remaining to maturity comparable
                                       to the relevant Interest Reference
                                       Period, or for 91 days, whichever is
                                       shorter.  If for 91 days the yield shall
                                       be calculated by reference to the
                                       average discount rate for Treasury Bills
                                       at the tender as published by the Bank
                                       of England weekly, usually on Friday; if
                                       for any lesser period the yield shall be
                                       calculated by reference to the discount
                                       rate quoted for the sale of Treasury
                                       Bills having that period remaining to
                                       maturity by a member of the London
                                       Discount Market Association at or about
                                       11.00 a.m. on the relevant day
                                       ("Treasury Bill Yield")

                                 S =   The amount required to be placed as
                                       Special Deposits with the Bank of
                                       England, expressed as a percentage of
                                       The Royal Bank of Scotland plc's
                                       Eligible Liabilities ("Special
                                       Deposits")

                                 Z =   The rate of interest, per annum, allowed
                                       by the Bank of England, from time to
                                       time, on Special Deposits ("Interest on
                                       Special Deposits")





                                       67
<PAGE>   73
                                       In making any calculation under this
                                       formula:

                                             any negative factor shall be given
                                             the value zero; and

                                             each calculation shall be rounded 
                                             up to the next one-sixteenth per 
                                             cent.

                                       Provided that if such formula ceases in
                                       the reasonable opinion of The Royal Bank
                                       of Scotland plc to be a realistic and
                                       accurate basis for calculating the cost
                                       of The Royal Bank of Scotland plc
                                       complying with any reserve assets,
                                       interest free, special deposit or other
                                       requirements of a similar nature imposed
                                       on it by any competent authority
                                       (including, without limitation, the Bank
                                       of England) with similar intent (whether
                                       or not such requirements have the force
                                       of law) or if such a cost is imposed
                                       directly on the Owner then the Owner
                                       shall be entitled to modify, expand or
                                       replace such formula to the extent that
                                       the Owner in its discretion and acting
                                       in good faith considers necessary to
                                       make it a realistic basis for recovery
                                       of any reserve asset costs arising in
                                       connection with the funding of the
                                       transactions contemplated by this
                                       Charterparty provided that any
                                       modification, expansion or replacement
                                       shall be of similar effect to other
                                       formulae having a like purpose being or
                                       to be applied by clearing banks or
                                       (where such cost is imposed directly on
                                       the Owner) of undertakings comparable to
                                       the Owner in the United Kingdom;

       "Secondary Period
           Charterhire"                means the charterhire calculated and
                                       payable in accordance with paragraph 6
                                       of this Schedule 3;

       "Variable Assumption"           means each of the Assumptions set out in
                                       paragraphs 3(i) - (xx) (inclusive) of
                                       this Schedule 3;





                                       68
<PAGE>   74
1.2    For the purposes of this Schedule 3, references to the Ship shall
       exclude references to the Goods.

2      Primary Period Charterhire

       2.1.1  During the Primary Period the Charterhire payable on each
              Charterhire Payment Date shall be L.14.768 per L.1000 of Original
              Cost.

       2.1.2  The Charterhire equates to a monthly rental of L.172,434 based on
              a capital cost of L.11,699,962.05.

2.2    Charterhire in respect of the Primary Period shall be payable in monthly
       installments in arrears on the first day of each month up to (and
       including) 1st April 2001.

2.3    Each Primary Period Charterhire shall be subject to adjustment in the
       manner specified in paragraph 4 of this Schedule 3.

3      Assumptions in relation to Primary Period

       The Primary Period Charterhire has been calculated on the following
       Assumptions:

       (i)    that the Original Cost would be incurred in seven installments in
              the following amounts on the following dates:


<TABLE>
<CAPTION>
              Date                                Amount per L.1,000
                                                  of Original Cost
              <S>                                     <C>
              20.12.90                                 470.09
              31.12.90                                 109.63
              25.02.91                                  65.17
              28.03.91                                 355.11
</TABLE>

              and;

       (ii)   that the Primary Period would commence on 31st March 1991; and

       (iii)  that in accordance with the provisions of Chapter I Part II CAA
              writing down allowances of 25 per cent per annum on a reducing
              balance basis in respect of Original Cost will be available to
              the Owner such writing down allowances to commence in respect of
              all installments of Original Cost in the Accounting Period of the
              Owner ending 31st March 1991 and to continue in each subsequent
              Accounting Period of the Owner until the Accounting Period of the
              Owner in which the Primary Period expires by effluxion of time,
              that the writing down





                                       69
<PAGE>   75
              allowances so available will not be withdrawn, either wholly or
              in part, and that there will be no delay in the agreement of the
              Owner's claim for such allowances; and

       (iv)   that the Ship will be sold in the Accounting Period of the Owner
              in which the Primary Period expires by effluxion of time and that
              the amount which the Owner is required to bring into account as
              disposal value on such sale in accordance with section 24 (6) CAA
              will be the balance of the Original Cost on which writing down
              allowances are assumed to be available for that Accounting Period
              by assumption (iii) above; and

       (v)    that any interest paid or assumed to be paid in respect of funds
              borrowed or assumed to be borrowed by the Owner for the purpose
              of this transaction is or would had it actually been paid have
              been allowed as a trading expense or as a charge on income in the
              Accounting Period of the Owner to which such interest relates or
              is paid (or assumed to be paid); and

       (vi)   that in the "requisite period" (as that expression is defined in
              section 40 CAA) the Ship will not be used for a purpose which
              results in section 42 CAA applying; and

       (vii)  that, in relation to Original Cost, no charge will arise under
              section 46 CAA in respect of any excess relief (as therein
              defined) or under section 42 CAA as the same may be amended,
              extended, substituted or replaced from time to time; and

       (viii) that any losses for taxation purposes arising to the Owner in
              connection with the transactions contemplated by this
              Charterparty (including losses arising as a result of the
              availability of the said allowances) will be available for offset
              against other profits of the Owner pursuant to section 393(2)
              ICTA or for surrender by way of group relief in accordance with
              the provisions of sections 402 to 413 ICTA (as amended, and in
              force, as at the date hereof) and that there will be no change in
              the law or practice in relation to group relief which would
              affect or in any way restrict the Owner's ability to surrender
              such losses to any company in the Owner's Group or the ability of
              any company in the Owner's Group to whom such losses are
              surrendered to claim or enjoy the benefit of such surrender; and

       (ix)   that the Corporation Tax Applicable Rate applicable to Accounting
              Periods of the Owner commencing on or after 1st April 1990 and
              ending with the Accounting Period of the Owner in which the Final
              Date falls will be 35 per cent; and

       (x)    that the Owner will not be required to bring into account as
              disposal value (within the meaning of and in accordance with the
              provisions of section 24 CAA) in respect of the Original Cost an
              amount greater than the Net Sale Proceeds and/or insurance
              proceeds in respect of the Ship actually received by the Owner;
              and





                                       70
<PAGE>   76
      (xi)    that no change occurs in the nature, method or application of any
              relevant United Kingdom taxation by reason of any enactment,
              provision, practice or ruling of or by any authority, whether
              legislative, judicial, administrative or revenue, after the date
              of this Charterparty; and
              
      (xii)   that the provisions of section 10 ICTA will not be amended after
              the date hereof so as to result in the Owner first becoming
              liable to pay any Corporation Tax on profits for any Accounting
              Period on a date other than the date which is nine months and one
              day after the end of that Accounting Period; and
              
      (xiii)  that the Owner will not be required by law or accounting practice
              to draw up its accounts for any period other than 12 months
              and/or as at any date other than 31st March in any year; and
              
      (xiv)   that the only amounts which the Owner will be required to bring
              into account as income in calculating its profits by reference to
              the chartering of the Ship will be the charterhire in Pounds
              payable pursuant to paragraph 2 of Schedule 3 to the Simon
              Charterparty; and
              
      (xv)    that all installments of charterhire to be received by the Owner
              under the Simon Charterparty will be fully taxable on their full
              amount in the Accounting Period of the Owner in which they fall
              due to be paid; and
              
      (xvi)   that the Pre-Primary Applicable Rate will be equal to the
              Reference Rate; and
              
      (xvii)  that the Owner would incur professional fees and disbursements of
              L.2 per L.1000 of Original Cost (exclusive of Value Added Tax) in
              respect of the transactions contemplated by the Simon
              Charterparty excluding the funding arrangements; and
              
      (xviii) that the fees incurred by the Owner referred to in paragraph 
              (xvii) above would be deductible as a trading expense in the 
              Accounting Period of the Owner in which such fees are (or were) 
              payable; and
              
      (xix)   that the interest assumed to be received and paid in Assumptions
              (xxii) and (xxiv) will be treated as accruing on a daily basis
              for the purpose of Corporation Tax and will be accrued on
              positive or negative balances of Notional Capital Outstanding (as
              the case may be) until the Final Date; and
              
      (xx)    (1)    that all losses arising in an Accounting Period of the
                     Owner as referred to in assumption (viii) will be
                     surrendered to members of the Owner's Group;

              (2)    that the Owner will receive payments for group relief on
                     the date assumed to be the date for payment of Corporation
                     Tax by the Owner in assumption (xii), that no refund of
                     such payments shall be made by the Owner and





                                       71
<PAGE>   77
                     that, in accordance with section 402(6) ICTA, such
                     payments will not be taken into account (either as a
                     receipt or a deduction) for Corporation Tax purposes; and

      (xxi)   that the Inland Revenue will not treat the respective disposal
              values of the Ship (excluding the Goods) and the Goods as being
              any amount different from that assumed by the Owner; and
              
      (xxii)  that on the Interest Payment Date in respect of each Interest
              Reference Period during which the Notional Capital Outstanding is
              
              
              (i)    a negative figure the Owner will pay interest calculated
                     on a daily basis using a 365 day year on the daily
                     balances of Notional Capital Outstanding during such
                     Interest Reference Period at the Reference Rate; or
              
              (ii)   a positive figure the Owner will receive interest
                     calculated on a daily basis using a 365 day year on the
                     daily balances of Notional Capital Outstanding during such
                     Interest Reference Period at a rate of 7 per cent per
                     annum; and
              
      (xxiii) the acquisition of the Ship by the Owner, its conversion pursuant
              to the Conversion and Supply Agreement, the chartering of the
              Ship under the Simon Charterparty, the sale of the Ship by the
              Owner under the Simon Charterparty and the funding of the
              transactions in relation thereto are the only transactions
              carried out by the Owner and the Owner shall be regarded as
              having no assets in respect of which capital allowances are
              available other than the Ship provided that nothing in this
              paragraph shall deem a balancing allowance to be received by the
              Owner at any time; and
              
      (xxiv)  that on each Pre-Primary Interest Payment Date in respect of each
              Pre-Primary Interest Reference Period during which Notional
              Capital Outstanding is a negative figure, the Owner will pay
              interest at the Pre-Primary Applicable Rate calculated on a daily
              basis using a 365 day year on the daily balances of Notional
              Capital Outstanding during each Pre-Primary Interest Reference
              Period and that such interest is compounded on 31st December 1990
              and 31st March 1991; and
              
      (xxv)   that no fees would be payable to London Financial Group Limited;
              and
              
      (xxvi)  that the interest referred to in assumptions (xxii) and (xxiv)
              will be payable to a person carrying on a bona fide banking
              business in the UK.

4     Adjustments to Primary Period Charterhire

4.1   Change in Assumptions





                                       72
<PAGE>   78
       On or as soon as reasonably practicable after any date on which the
       Owner becomes aware or is notified by Simon or the Charterer that there
       has been a change in any of the Variable Assumptions on the basis of
       which the Primary Period Charterhire has been calculated and the effect
       of such change would require the Primary Period Charterhire to be
       adjusted if the Owner's Return is neither to be increased or decreased,
       the Owner shall notify Simon who shall notify the Charterer of the
       amount by which the Primary Period Charterhire is required to be
       adjusted upwards or downwards.  Any such adjustment shall:

       (a)    subject to sub-paragraphs (b) and (c) below, be calculated on the
              same basis as the Primary Period Charterhire was calculated and
              by reference to the Assumptions in order to ensure that the
              Owner's Return is neither increased nor decreased; and

       (b)    take into account any changes in any of the Variable Assumptions
              which have occurred (and are known to the Owner) between the date
              of this Charterparty and the date of notification of such
              adjustment; and

       (c)    be such as to ensure that, subject to the payment by the
              Charterer of the adjusted Primary Period Charterhire on each
              subsequent Charterhire Payment Date and on the basis that each
              installment of the adjusted Charterhire shall bear to each other
              such installment the same ratio as each installment of the
              Primary Period Charterhire has to each other Primary Period
              Charterhire installment, the Notional Capital Outstanding on the
              Final Date will be zero or as near thereto as may be.

4.2    Adjusted Primary Period Charterhire

       As from the date any notification of adjusted Primary Period Charterhire
       is to take effect in accordance with this Charterparty the amount of
       Charterhire to be paid on each Charterhire Payment Date during the
       Primary Period shall be the adjusted Primary Period Charterhire so
       notified.

4.3    Change in Assumptions after the Primary Period

       If the Owner shall become aware or is notified by Simon or the Charterer
       that there has been a change in any of the Variable Assumptions on the
       basis of which any Primary Period Charterhire has been calculated at a
       time when no Primary Period Charterhire remains to be paid the Owner
       shall as soon as reasonably practicable determine a single amount
       calculated on the basis of the Assumptions but taking into account any
       changes in any of the Variable Assumptions which have occurred and are
       known to the Owner between the date of the Simon Charterparty and the
       date of such calculation which shall be either payable by Simon to the
       Owner by way of additional Charterhire or by the Owner to Simon by way
       of rebate of Charterhire and which amount shall be calculated so that
       the Owner's Return is neither increased nor decreased.  No account shall
       be taken of a change in a Variable Assumption occurring more than six
       years after the last day of





                                       73
<PAGE>   79
       the Accounting Period in which the final installment of Primary Period
       Charterhire falls to be paid.

4.4    Correcting adjustments

       If a Variable Assumption which has been regarded as incorrect
       subsequently proves to have been correct or to be incorrect in a
       different manner or with a different effect from that which such
       Assumption was originally regarded as incorrect, then, such further
       adjustments shall be made under paragraph 4 as may be required to ensure
       that the Owner's Return is the same as it would have been had the
       relevant Assumption (and all such other Assumptions) proved to be
       correct at all times (but fully taking into account the amount of any
       previous adjustments).

4.5    Exclusion of Adjustments

       No adjustment of charterhire shall be made under Paragraph 4 if and to
       the extent that any of the Variable assumptions shall prove to be
       incorrect solely as a result of:

   (i)        otherwise than as a result of Assumption (xi) proving to be
              incorrect, the Owner not being or ceasing to be resident in the
              UK for the purpose of Corporation Tax or not being or ceasing to
              be within the charge to Corporation Tax in respect of the Ship;

  (ii)        otherwise than as a result of Assumption (xi) proving to be
              incorrect or a default by Simon under the Simon Charterparty or
              by the Charterer, the Owner (or any member of the Owner's Group
              to which it might surrender or purport or wish to surrender group
              relief) not having a sufficiency of profits, or gains or income,
              in any Accounting Period or part thereof;

 (iii)        otherwise than as a result of Assumption (xi) proving to be
              incorrect, the Owner (or member of the Owner's Group as
              aforesaid) voluntarily causing any or permitting any of its
              Accounting Periods to be other than twelve months ending on a
              date other than on 31st March in each year;

  (iv)        the Owner failing duly to claim in the appropriate amount and in
              the correct manner or disclaiming any capital allowance to which
              it is properly entitled (or to which but for any of the facts or
              circumstances referred to in this paragraph 4.5 it would be
              properly entitled) in respect of the Ship;

   (v)        the Owner disposing of the Ship (or any interest therein)
              otherwise than in accordance with or as contemplated by the Simon
              Charterparty;

  (vi)        the Owner materially failing to meet its obligations under clause
              2.5 and/or clause 3.4 of the Conversion and Supply Agreement;





                                       74
<PAGE>   80
4.6    Notification and Disputes

       (a)    Simon shall endeavor to procure that the Owner shall certify in
              writing the amount of any calculation or adjustment under
              Schedule 3 or Schedule 4 or the determination of any rate of
              interest or other amount payable together with reasonably
              sufficient detail to substantiate such calculation, adjustment or
              determination and in the event of there being a dispute as to the
              amount of such calculation, adjustment or determination, then
              without prejudice to the obligation of the Charterer to pay
              amounts as certified pending resolution of such dispute, the same
              shall immediately be referred to the auditors for the time being
              of the Owner ("the Accountants") (acting as experts and not as
              arbitrators) whose decision shall, in the absence of manifest
              error, be final and binding on the parties.

       (b)    Simon shall endeavor to procure that the Owner shall supply to
              the Accountants a copy of the example cash flow on which the
              Owner has based the calculation of Primary Period Charterhire and
              the Owner shall provide the Accountants with any revised cash
              flow on the basis of which the Owner calculates an adjustment to
              the charterhire payable hereunder.

       (c)    Where the decision of the Accountants results in an adjustment to
              any calculation certified as aforesaid by the Owner, such payment
              shall be made between the parties as the Accountants (acting as
              experts and not as arbitrators) shall certify as appropriate to
              give effect to such adjustment (after taking into account any
              financial or cash flow advantage or disadvantage to either of the
              parties resulting from the making of such adjustments and
              payments).  The costs of and in connection with such reference to
              the Accountants shall unless otherwise agreed, be payable by the
              Charterer unless the Accountants' decision shall reveal that the
              Owner's calculation of such adjustment or determination was
              significantly inaccurate, having regard to the size of the
              transaction of which the Simon Charterparty forms part and the
              result thereof would have been adverse to Simon and the
              Charterer.

       (d)    Simon shall notify the Charterer of any notification received by
              it from the Owner of any communication ("Claim") it receives from
              the Inland Revenue indicating that any matter relating to or
              affecting the correctness of any of the Variable Assumptions
              and/or Variable Termination Assumptions is being disputed by the
              Inland Revenue and as a result there is or it appears that there
              is likely to be an upward adjustment of charterhire under the
              Agreement or upward adjustment in the Termination Sum.

       (e)    Following such notification and provided that Simon continues to
              receive from the Charterer all amounts of Charterhire and all
              other sums payable under this Charterparty Simon shall endeavor
              to procure discussions with the Owner concerning the Claim with
              Simon and the Charterer and Simon shall (subject to





                                       75
<PAGE>   81
              the prior written consent of the Owner having been obtained)
              provide the Charterer such relevant extracts of the
              correspondence with the Inland Revenue concerning such Claim as
              it receives from the Owner.  It is, for the avoidance of doubt,
              accepted and agreed by the Charterer that the Owner shall not be
              required to provide any information or correspondence which is in
              the opinion of the Owner confidential or of a sensitive nature
              having regard to the business of the Owner or of the Owner's
              Group.  Such discussions (if any) shall take place with a view to
              agreeing the form and content of the Owner's response to such
              Claim.

       (f)    If the subject matter of the Claim is not resolved by negotiation
              with the Inland Revenue Simon will at the request of the
              Charterer require the Owner to obtain (at the expense of the
              Charterer) the opinion of leading tax counsel ("Counsel")
              concerning the merits of the subject matter of the claim.  The
              Owner and Simon, after consultation with the Charterer, will
              instruct such Counsel as the Owner and Simon may mutually agree
              provided that if the parties shall not reach such agreement the
              Owner shall instruct the Counsel of its choice.  The Owner's
              legal advisers will prepare Instructions to Counsel.  Simon,
              after consultation with the Charterer, may make representations
              as to the contents of such Instructions but the Owner shall not
              be obliged to reflect those representations in the Instructions
              submitted to Counsel.  Simon, after consultation with the
              Charterer and its professional advisers, may attend any
              conference with Counsel save that Simon and its professional
              advisers shall withdraw from such conference at the request of
              the Owner when in the opinion of the Owner matters which in the
              Owner's opinion are confidential or of a sensitive nature having
              regard to the business of the Owner or the Owner's Group may be
              discussed during such conference.

       (g)    The Owner shall have the sole right to decide whether to pursue
              any appeal to the Special or General Commissioners (as the case
              may be) or beyond.  The Owner and Simon, after consultation with
              the Charterer, agree to consult in such circumstances with a view
              to agreeing whether or not any application for postponement of
              payment of tax should be made.

       (h)    Simon has agreed, but as between Simon and the Charterer, for the
              account of the Charterer to keep the Owner indemnified against
              any costs, expenses or charges (including, without limitation,
              interest or penalties in respect of Taxes) arising to or incurred
              by the Owner in respect of any action taken by the Owner under
              the provisions of sub-paragraph 4.6(d) to (g) or their equivalent
              in the Simon Charterparty (inclusive) and it shall be a condition
              precedent to the Owner's obligations under those sub-paragraphs
              that Simon (but only if properly indemnified and secured to
              Simon's satisfaction by the Charterer) shall provide or procure
              security to the reasonable satisfaction of the Owner in respect
              of its obligations under this paragraph 4.6(h).






                                       76
<PAGE>   82
4.7    Limitation

       In the event of any assignment or transfer of the Simon Charterparty by
       the Owner pursuant to Clause 28 other than to a member of the Owner's
       Group the Charterer shall have or incur (at that or at any subsequent
       time) no greater liability to pay any charterhire, additional
       charterhire, Termination Sum or other moneys under the Charterparty or
       have or enjoy (at that or any subsequent time) any lesser entitlement to
       a reduction, refund, repayment or rebate of any charterhire, additional
       charterhire, Termination Sum or any other moneys than it would have had
       if no such sale or disposal had been made and had Royal Bank of Scotland
       (Industrial Leasing) Limited continued to be the Owner at all material
       times.

5.  Adjustment to Charterhire for chances in Interest Rates

5.1    The Primary Period Charterhire has been calculated on the assumption
       that the Applicable Rate for each Interest Reference Period will be 13
       per cent per annum.  Where for any Interest Reference Period the
       Applicable Rate shall be more or less than 13 per cent per annum then on
       the relevant Interest Payment Date the Charterer shall pay to Simon by
       way of additional charterhire or Simon shall pay to the Charterer
       (provided Simon shall have received such amount from the Owner pursuant
       to the Simon Charterparty) by way of rebate of Charterhire the amount
       calculated by multiplying for each 1 per cent increase or decrease in
       the Applicable Rate above or below 13 per cent (with adjustments for
       variation other than an integral multiple of 1 per cent being made pro
       rata to two decimal places) the Original Cost by the amount listed
       opposite the relevant Interest Reference Period in Column 3 of the Table
       annexed to this Schedule 3 and dividing the result by 1,000.

5.2    The amounts specified in Column 3 of the Table annexed to this Schedule
       3 are calculated by the Owner on the basis of the Assumptions.  In the
       event that any of the Variable Assumptions proves to be incorrect then
       the Owner will provide Simon, who will provide it to the Charterer, with
       a revised Table prepared on the same basis as the Table annexed to this
       Schedule 3 except in so far as is necessary to reflect the change in any
       Variable Assumptions which have proved to be incorrect.  Thereupon this
       paragraph shall continue to apply in respect of such revised Table
       mutatis mutandis and so on.

5.3    The Primary Period Charterhire payable under paragraph 2 of this
       Schedule 3 (including any adjustments thereto which may be required
       pursuant to the terms of this Schedule) may be replaced by agreement
       between the Owner and Simon, after consultation with the Charterer, by
       Primary Period Charterhire calculated on the same basis but adjusted to
       reflect the availability of fixed-rate funding to be obtained by the
       Owner in place of variable rate fuming obtained or assumed to be
       obtained by the Owner for the purposes of the transactions contemplated
       by this Charterparty.  In such event the Owner and Simon shall enter
       into a memorandum specifying the terms on which the Primary Period
       Charterhire shall be adjusted and the Table annexed to this Schedule 3
       (or replacement Table) shall be revised accordingly to take account of
       such fixed rate funding on the basis that the Owner's Return shall





                                       77
<PAGE>   83
                                   SCHEDULE 4
                                Termination Sum

1.1    In addition to the definitions comprised in Clause 1 and paragraph 1 of
       Schedule 3 to this Charterparty the following expressions shall have the
       following meanings:

       "Table"                     means the table annexed to this Schedule 4;

       "Revised Table"             means any revised Table produced pursuant to
                                   paragraph 3 of this Schedule 4;

       "Settlement Date"           means each of the dates set out in Column 1
                                   of the Table or any Revised Table

       "Variable Termination       means the assumptions set out in
       Assumptions"                paragraph 3.2 of this Schedule 4.

1.2    For the purposes of this Schedule 4, references to the Ship shall
       exclude references to the Goods.

2      The Termination Sum on any relevant date shall be the sum calculated
       according to the following formula:

                     A X B
                     -----
                     1000

       where:

       (i)    A =    Original Cost of the Ship; and
       (ii)   B =    the amount listed in Column 2 of the Table or any Revised
                     Table opposite, where the relevant date is not a
                     Settlement Date, the next following Settlement Date or
                     where the relevant date is a Settlement Date, that
                     Settlement Date.

3.1    The amounts specified in Column 2 of the Table are calculated on the
       basis of the Assumptions and the Variable Termination Assumptions.

3.2    The Variable Termination Assumptions are:

       (a)    that for the purposes of section 24 CAA the amount of the Net
              Sale Proceeds (in the case of a sale of the Ship) and/or any
              moneys actually received by the Owner in respect of a Total Loss
              will be equal to the qualifying expenditure in respect of the
              Original Cost at the commencement of the Accounting Period of the
              Owner in which the Termination Sum is payable;





                                       78
<PAGE>   84
       (b)    that for the purposes of section 24 CAA the Ship will be sold or
              a Total Loss will occur and Net Sales Proceeds or, as the case
              may be, insurance proceeds will be received by the Owner in the
              same Accounting Period as that in which the Termination Sum is
              payable;

       (c)    that the refund of charterhire or payment of sales agency
              commission in respect of Net Proceeds of Sale and/or moneys
              received by the Owner in respect of a Total Loss due in
              accordance with Clauses 3.5, 21.5 and 25.2 of the Simon
              Charterparty:

              (i)    will occur in the Accounting Period of the Owner in which
                     the Termination Sum is payable;

              (ii)   that any refund of charterhire will be wholly deductible
                     for Corporation Tax purposes as a trading expense in the
                     Accounting Period of the Owner in which the Termination
                     Sum is payable;

              (iii)  that any payment of sales agency commission (excluding
                     recoverable Value Added Tax) will be deductible from and
                     in computing the amount to be brought into account as
                     disposal value under section 24 CAA in the Accounting
                     Period of the Owner in which such disposal value falls to
                     be brought into account;

              (iv)   that the Owner will be able effectively to deduct the
                     trading expense referred to in paragraph 3.2(c)(ii) above
                     in computing its Corporation tax liability in respect of
                     the Net Proceeds of Sale and/or any moneys received by the
                     Owner in respect of a Total Loss; and

       (d)    that all and no more or no less of the Net Proceeds of Sale (less
              any sales agency commission) and/or any moneys received by the
              Owner in respect of Total Loss in excess of Original Cost shall
              be treated as a Chargeable gain for United Kingdom Corporation
              Tax purposes in the Accounting Period of the Owner in which the
              Termination Sum falls due and that the rate of Corporation Tax in
              respect of chargeable gains is the same as the rate assumed in
              paragraph 3.1(ix) of Schedule 3;

3.3    On or as soon as reasonably practicable after any date on which the
       Owner becomes aware that any of the Variable Assumptions or any of the
       Variable Termination Assumptions has become or will become incorrect
       (which shall be referred to in this Schedule 4 as a change in a Variable
       Assumption or Variable Termination Assumption) then the Owner will
       provide Simon who will provide it to the Charterer with a Revised Table
       (but only if such Revised Table would differ from the existing Table)
       prepared on the same basis as the Table except that the preparation of
       such Revised Table shall take account of the change in any Variable
       Assumption or Variable Termination Assumption





                                       79
<PAGE>   85
       and except that such Revised Table shall take account of the Termination
       Sum due and payable on the Termination Date where the Revised Table is
       produced after such date and which Revised Table shall be calculated so
       that the Owner's Return shall be neither increased nor decreased.
       Insofar as a Change in Variable Termination Assumption 3.2(d) is
       concerned no account shall be taken in preparing any Revised Table of
       (a) any rollover or holdover of gains to another asset or (b) of any
       allowable losses arising to the Owner from the disposal of assets other
       than losses arising to the Owner from the disposal of assets other than
       the Ship or (c) of relief for any losses for the purpose of capital
       gains tax or Corporation Tax on chargeable gains arising from the
       disposal of the Ship.  Any Revised Table shall be deemed to take effect
       from the date when the change in any such Variable Assumption or
       Variable Termination Assumption occurs.

3.4    Following production by the Owner to Simon who will produce it to the
       Charterer of a Revised Table pursuant to paragraph 3.3 of Schedule 4 to
       the Simon Charterparty at a time after the Termination Sum has been paid
       or the obligation to pay the Termination Sum has been discharged the
       Owner shall recalculate the amount of the Termination Sum using such
       Revised Table with effect from the date on which the Termination Sum was
       first calculated and shall notify Simon who will notify the Charterer of
       the amount thereof and of the amount of difference between the
       Termination Sum as so calculated and as immediately previously
       calculated.  Within 30 days of such notification the Charterer shall pay
       to the Owner by way of additional charterhire the amount of the
       difference so notified where that amount is a positive figure or the
       Owner shall pay to Simon who will remit the Charterer by way of rebate
       of charterhire the amount of the difference so notified where the amount
       is a negative figure.

3.5    As from the date any Revised Table is to take effect in accordance with
       this Charterparty the same shall be deemed to be incorporated herein in
       substitution for the Table or any previous Revised Table and payments to
       be made hereunder shall be determined by reference thereto.

3.6    No Revised Table may be produced pursuant to paragraph 3.3 above if the
       date on which the Owner became aware that there has been any change in a
       Variable Assumption or Variable Termination Assumption falls seven years
       after the date which is nine months and one day after the last day of
       the Accounting Period of the Owner in which the Termination Sum
       initially fell due to be paid.

4.     Paragraphs 4.4 to 4.7 of Schedule 3 to this Charterparty shall apply
       with all necessary and/or appropriate adaptations to this Schedule in
       relation to Variable Termination Assumptions, revisions to the Table and
       adjustments to or repayments of Termination Sums (and other matters
       contemplated hereby) as it applies to that Schedule in relation to
       Variable Assumptions or adjustments of charterhire (and other matters
       contemplated thereby).





                                       80
<PAGE>   86
                               Table to Schedule

<TABLE>
<CAPTION>
Termination          Termination                  Termination        Termination
- -----------          -----------                  -----------        -----------
Date                 Amount                       Date               Amount     
- ----                 ------                       ----               ------     
<S>                  <C>                          <C>                  <C>
1 May 1991           1053.68                      1 January 1995       829.35
1 June 1991          1051.50                      1 February 1995      823.29
1 July 1991          1048.89                      1 March 1995         816.30
1 August 1991        1046.59                      1 April 1995         797.80
1 September 1991     1044.34                      1 May 1995           791.13
1 October 1991       1037.63                      1 June 1995          784.63
1 November 1991      1035.10                      1 July 1995          777.80
1 December 1991      1032.28                      1 August 1995        771.13
1 January 1992       1029.83                      1 September 1995     764.37
1 February 1992      1026.73                      1 October 1995       757.28
1 March 1992         1022.83                      1 November 1995      750.34
1 April 1992         1009.96                      1 December 1995      743.07
1 May 1992           1006.28                      1 January 1996       735.95
1 June 1992          1002.92                      1 February 1996      728.77
1 July 1992           999.15                      1 March 1996         721.00
1 August 1992         995.70                      1 April 1996         702.17
1 September 1992      992.20                      1 May 1996           694.38
1 October 1992        988.30                      1 June 1996          686.73
1 November 1992       984.71                      1 July 1996          678.75
1 December 1992       980.71                      1 August 1996        ------
1 January 1993        977.02                      1 September 1996     662.94
1 February 1993       972.96                      1 October 1996       654.67
1 March 1993          967.82                      1 November 1996      646.50
1 April 1993          952.12                      1 December 1996      638.02
1 May 1993            947.46                      1 January 1997       629.65
1 June 1993           943.09                      1 February 1997      621.25
1 July 1993           938.32                      1 March 1997         612.14
1 August 1993         933.82                      1 April 1997         593.45
1 September 1993      929.26                      1 May 1997           584.46
1 October 1993        924.31                      1 June 1997          575.55
1 November 1993       919.63                      1 July 1997          566.34
1 December 1993       914.56                      1 August 1997        557.20
1 January 1994        909.75                      1 September 1997     547.94
1 February 1994       904.72                      1 October 1997       538.39
1 March 1994          898.68                      1 November 1997      528.89
1 April 1994          881.20                      1 December 1997      519.11
1 May 1994            875.56                      1 January 1998       509.37
1 June 1994           870.16                      1 February 1998      499.65
1 July 1994           864.38                      1 March 1998         489.33
</TABLE>





                                       81
<PAGE>   87
<TABLE>
<CAPTION>
Termination          Termination                  Termination        Termination
- -----------          -----------                  -----------        -----------
Date                 Amount                       Date               Amount     
- ----                 ------                       ----               ------     
<S>                  <C>                          <C>                  <C>
1 August 1994         858.83                      1 April 1998         471.22
1 September 1994      853.20                      1 May 1988           460.91
1 October 1994        847.21                      1 June 1998          450.63
1 November 1994       841.43                      1 July 1998          440.08
1 December 1994       835.29                      1 August 1998        429.54
1 September 1998      418.86                      1 January 2000       224.15
1 October 1998        407.93                      1 February 2000      211.39
1 November 1998       396.98                      1 March 2000         198.29
1 December 1998       385.77                      1 April 2000         182.39
1 January 1999        374.55                      1 May 2000           169.08
1 February 1999       363.38                      1 June 2000          155.66
1 March 1999          351.74                      1 July 2000          142.06
1 April 1999          334.57                      1 August 2000        128.28
1 May 1999            322.83                      1 September 2000     114.35
1 June 1999           311.05                      1 October 2000       100.24
1 July 1999           299.04                      1 November 2000       85.97
1 August 1999         286.96                      1 December 2000       71.61
1 September 1999      274.73                      1 January 2001        57.18
1 October 1999        262.28                      1 February 2001       42.66
1 November 1999       249.75                      1 March 2001          28.04
1 December 1999       236.99                      1 April 2001          14.43
</TABLE>

Where a Termination Sum falls due on a rental payment date the rental payable
on such a date is included in the Termination Sum quoted.





                                       82
<PAGE>   88
                                   SCHEDULE 5

                         Forms of Loss Payable Clauses

(A)    Hull and Machinery (Marine and War Risks)

       By a Charterparty by way of Demise made the          day of December,
       1990, Royal Rank of Scotland (Industrial Leasing) Limited (the "Owner")
       has demise chartered m.v. "Seaway Labrador" (the "Ship") to
       Simon-Horizon Limited ("Simon") and Simon has pursuant to a first
       priority assignment contained in such Charterparty assigned to the Owner
       all of Simon's right, title and interest in all policies and contracts
       of insurance from time to time taken out or entered into by or for the
       benefit of Simon or the Owner; Simon has by a Charterparty by way of
       sub-demise dated [          1994] chartered the Ship to Horizon
       Exploration Limited (the "Charterer") and the Charterer has pursuant to
       a first priority assignment (the "Horizon Assignment") contained in such
       Charterparty assigned to Simon all of the right, title and interest of
       the Charterer in any and all policies and contracts of insurance from
       time to time taken out or entered into by or for the benefit of the
       Charterer and Simon and the Owner in respect of the Ship Simon has
       pursuant to a further assignment dated [          1994] assigned to the
       Owner all of the rights, title and interest so assigned to Simon
       pursuant to the Horizon Assignment.

       All recoveries under this policy shall be applied as follows:

       -      all claims hereunder shall be paid in full to the Owner or to its
              order;

(B)    Protection and Indemnity Risks

       Payment of any recovery which Royal Bank of Scotland (Industrial
       Leasing) Limited of 42 St. Andrew Square, Edinburgh EH2 2YE (the
       "Owner") or Simon-Horizon Limited of Horizon House, Azalea Drive,
       Swanley, Kent BR8 8JR ("Simon") or Horizon Exploration Limited (the
       "Charterer") is entitled to make out of the funds of the Association in
       respect of any liability, costs or expenses incurred by the Owner or
       Simon or the Charterer, shall be paid to the person to whom the
       liability (or alleged liability) covered by the entry was incurred or if
       the liability (or alleged liability) to such person has previously been
       discharged by the Owner or Simon or the Charterer, such moneys shall be
       paid to the Owner or its order or, as the case may be, to Simon or the
       Charterer or to their respective order in reimbursement of the moneys so
       expended by them in satisfaction of such liability or alleged liability,
       unless and until the Association receives notice to the contrary from
       the Owner; provided that no liability whatsoever shall attach to the
       Association, its Managers or their agents for failure to comply with the
       later obligation until the expiry of two clear business days from the
       receipt of such notice.





                                       83
<PAGE>   89
                                   SCHEDULE 6

Notwithstanding the other terms of this Charterparty by way of Sub-Demise Simon
and the Charterer agree that:

1.     (a)    Simon shall continue to be responsible for payments to the Owner
              currently provided for in respect of the Simon Charterparty
              without variation or alteration thereof and the Charterer's
              obligation to pay charterhire under this Charterparty shall not
              (except in case of default by the Charterer in respect of any of
              its obligations hereunder) commence until such time as the
              aggregate amount of such payments by Simon to the Owner after
              30th June 1994 shall exceed, in aggregate, L.2,336,000;

       (b)    Simon shall notify the Charterer in writing of the payment or
              payments to be made by Simon which will cause such aggregate
              figure to be exceeded and Simon shall direct the Charterer to pay
              direct to the Owner the balance of such payment or payments and
              the Charterer shall make such payments on the due date or dates
              therefor; and

       (c)    the Charterer shall thereafter make payments in full under this
              Charterparty strictly in accordance with the terms hereof.

2.     (a)    If, in relation to any period prior to 30th June 1994, there
              shall be any increase or decrease in rental payable by Simon by
              way of adjustment of rental pursuant to paragraph 4 of Schedule 3
              to the Simon Charterparty or any amount shall be payable or
              received by Simon pursuant to paragraph 4 of such Schedule 3,
              such increase or decrease in rental or amount payable shall be
              for the exclusive account or benefit of Simon whenever such
              adjustment shall become effective or such payment be made;

       (b)    If any such adjustment or payment as aforesaid shall relate to
              any period after 30th June 1994, such increase or decrease in
              rental or such amount payable shall be for the exclusive account
              or benefit of the Charterer.

       Provided always that the obligation of Simon to pay such aggregate
       L.2,336,000 sum referred to in paragraph 1 above in respect of
       charterhire payable after 30th June 1994 shall be to pay such aggregate
       sum net of all such adjustments of rental and such amounts as may be
       payable in relation to the period after 30th June 1994.





                                       84
<PAGE>   90
SIGNED by                          )
for and on behalf of               )
SIMON-HORIZON LIMITED              )
in the presence of:                )

/s/ Andrew R. Murray
Andrew R. Murray
Solicitor
14 Diminion St.
ECZ



SIGNED by                          )
for and on behalf of               )       /s/ J.M. Harrison
HORIZON EXPLORATION LIMITED        )
in the presence of:                )

/s/ Andrew R. Murray





                                       85

<PAGE>   1


                                                                          10.9.2
                              MANAGEMENT AGREEMENT



                                    between


                             SIMON-HORIZON LIMITED

                                      and

                           ERVIK MARINE SERVICES A/S


                             M.V. "SEAWAY LABRADOR"
<PAGE>   2
                              MANAGEMENT AGREEMENT

                                      for

                             M.V. "SEAWAY LABRADOR"


It is agreed between Simon-Horizon Limited, Horizon House, Azalea Drive,
Swanley, Kent BR8 8JR, United Kingdom (hereinafter called the "Company") (being
disponent owners of M.V. "SEAWAY LABRADOR" (hereinafter called the "Vessel")
under a demise charterparty ("the Head Charter") to be entered into between
Company and the Royal Bank of Scotland (Industrial leasing) Limited ("the
Registered Owners") as registered owners of the vessel) of the first part and
Ervik Marine Services A/S, Brunholmgt 2, N-6004, Alesund, Norway (hereinafter
called the "Mangers") of the second part as follows:

1.       Nature of Service

1.1      Company hereby appoints Managers to manage the Vessel and to perform
         and provide, inter alia, the services specified in this Agreement and
         Managers hereby agree to manage the vessel as described in Schedule A
         herein and to perform and provide such services from the time
         specified in Clause 2.1 of this agreement.

1.2      Company shall employ the Vessel throughout the world in lawful
         activities for marine geophysical and/or oceanographic and/or
         associated or related duties as required by Company.

2.       Commencement

2.1      Management of the Vessel by Mangers shall commence on the 20th day of
         December, 1990.

2.2      Upon commencement of the Management of the Vessel under this Agreement
         by Managers, a joint survey of the Vessel shall be undertaken by
         Company and Managers to determine the precise condition of the Vessel
         and its equipment.

3.       Managers to Provide

3.1      In consideration of the payment by Company of the Management Fees in
         accordance with Clause 9.1. of this Agreement, Managers shall provide
         (except as otherwise specified) all services, spares, replacement
         parts (excluding same for seismic equipment) and other items referred
         to herein entirely at the cost of Managers without any right of
         reimbursement from Company.





                                       1
<PAGE>   3
3.2      The Managers shall provide and pay for all wages for Officers and Crew
         (including all overtime and bonus payments), travel expenses within
         the United Kingdom for Officers and Crew, provisions, insurance of the
         Vessel (including hull and machinery and protection and indemnity
         insurance) for all deck and engineroom store, and the expenses of
         maintaining the hull and machinery (excluding seismic equipment) in
         the thoroughly efficient state during the duration of this agreement
         including (but not limited to) the expenses of providing replacement
         parts, equipment or spares, drydocking and other external services
         provided in relation to the maintenance of the hull and machinery as
         aforesaid.

3.3      The Managers shall also provide and pay for all bedding, crockery and
         galley equipment, including the necessary renewal of same, for
         officers, Crew and Company's personnel and their representatives,
         cleaning materials for all cabins, common areas and work areas.

4.       Managers to Provide and Company to Pay

4.1      Company shall be responsible for bunkers.  Managers shall provide at
         the best available price (with benefit of any reductions, rebates or
         commissions) and Company shall reimburse Managers in respect of all
         lubricating oils and fresh water (it being understood that the
         acceptance of each supply (including bunkers) is the responsibility of
         the Chief Engineer).  Managers shall pay for and Company shall
         reimburse Managers in respect of port charges, pilotages (whether
         compulsory or not), canal charges and steersman, boatage, lights, tug
         assistance in port when compulsory or at the Company's request or in a
         situation when the Master deems same necessary for safety, consular
         charges (except those pertaining to the Master, Officers and Crew),
         agencies, meals supplied to Company or officials in their service and
         their clients' representatives.

4.2      Company shall be responsible for reimbursing Managers for any
         extraordinary or special taxes, other than those of the Nation of the
         Vessel's Registry, levied on the Managers and/or the Vessel and/or the
         Crew.

5.       Excluded Ports

5.1      The Vessel shall not be ordered to nor bound to enter any place where
         fever or epidemics are prevalent or to which the Master, Officers and
         Crew are by Law not bound to follow the Vessel.

5.2      The Vessel shall not be ordered to nor bound to enter any ice bound
         place where lights, lightships, marks or buoys are or are likely to be
         withdrawn by reason of ice on the Vessel's arrival or where there is
         risk that ordinarily the Vessel will not be able on account of ice to
         reach her destination or get out.  If, on account of ice, the Master
         considers it dangerous to remain in any area or place for fear of the
         Vessel being frozen in and/or damaged, he has liberty to sail to a
         convenient open place and await the Company's fresh instructions.





                                       2
<PAGE>   4
5.3      The Vessel shall not be obligated to force ice.

5.4      Save the above, the Company shall be entitled to require Managers to
         sail the Vessel to any port or ports around the world without
         exclusion.

6.       The Vessel

6.1      From the time the Management of the Vessel commences this Agreement,
         Managers warrant that the Vessel shall fully conform to the
         specifications stated in Schedule A herein and shall in every way be
         fitted and ready for service throughout the world (unless otherwise
         stated in Schedule A).

6.2      Unless otherwise agreed in writing, the Vessel shall remain under the
         Bahamas flag for the duration of the Management Agreement.

6.3      The Mangers may, subject to the approval of Company, appoint a
         sub-manager for the Vessel.  The Managers shall ensure that the
         sub-managers duly appointed are made aware of the Managers obligations
         under this Management Agreement.

6.4      The Managers shall not make any changes in the appointment of the
         Vessel's sub-managers during the first year of this agreement unless
         otherwise mutually agreed between Company and Managers beforehand.

6.5      The Company reserves the right, should they be dissatisfied with the
         original sub-managers, to require the appointment of an alternative
         sub-management company.  Any alternative sub-manager shall be
         nominated by Managers subject to Company's approval.

6.6      During the period of the Agreement, with the exception only of the
         standby period, as per Clauses 7.2 and 9.2 herein, the Vessel shall at
         all times with a minimum crew of twelve, namely:

                 Master
                 Chief Officer
                 Second Officer
                 Chief Engineers
                 Motorman
                 Second Engineer
                 Electrician
                 Two Able Seamen
                 Three Catering Personnel

                 See also Clause 9.3 herein.





                                       3
<PAGE>   5
6.7      The Managers warrant that throughout the period of this agreement the
         Vessel will be manned only by Officers and Senior Crew members who
         shall be British Nationals and up to a maximum of four other Crew
         members who can be Foreign Nationals however, should the Company and
         Managers agree to amend this requirement any savings made shall be
         divided equally between the Company and Managers.  Should the Company
         have reason to be dissatisfied with any amended crewing arrangement,
         then Managers shall revert back to a one hundred percent complement of
         British Nationals.

6.8      Throughout the duration of this agreement, the Managers warrant the
         Vessel will be fully certificated and shall conform in every respect
         with the Bahamas Flag and that all national and international trading
         certificates, loadline, firefighting, life saving and other relevant
         regulations are fully complied with and remain in full force and
         effect.

6.9      The Managers warrant and agree to, at their sole expense: (1) keep the
         Vessel in a thoroughly efficient state in hull, machinery and
         equipment in good running order and in every respect seaworthy (2) pay
         all wages, salaries, taxes and other benefits prescribed by Law for
         the Master, Officers and Crew (3) operate and maintain the Vessel,
         excluding seismic equipment, in accordance with all applicable State
         and Federal Laws, rules and regulations of jurisdictions in which the
         Vessel is working and carry onboard required documents.

6.10     Mangers shall comply with the requirements of Company in ensuring the
         whole reach and burden and lawful decks of the Vessel shall be
         available for Company's marine activities.

6.11     Managers have receive from Company copies of the following documents:

         1.      the Head Charter
         2.      The Conversion Contract dated 18 October, 1990 between
                 Moterenwerk Bremerhaven GMBH, Shipyard Germany.  
         3.      the Conversion Contract to be entered into between the 
                 Registered Owners and Company.

         and hereby warrants to Company that Managers are fully aware of the
         contents thereof and will comply at all times with the provisions
         thereof.

7.       Period of Management

7.1      Subject to Clause 8., Company's appointment of Managers as Managers of
         the Vessel shall continue for a period of 10 years from the date of
         commencement of the Management of the Vessel hereunder.





                                       4
<PAGE>   6
7.2      The period of management will comprise of three parts:

                 AA.      Pre-Conversion Period

                          An interim management period from the time the Vessel
                          is taken over by the Managers in December, 1990 until
                          the Vessel arrives at Motorenwerk Bremerhaven GMBH
                          (MWB) Shipyard, Germany on or about early January,
                          1991.  During this period the terms of this agreement
                          shall apply in full.

                 BB.      Conversion Period

                          A standby management period during the time the
                          Vessel arrives at the shipyard until the Vessel is
                          ready for Sea Trials on or about mid March, 1990.
                          During this period only limited management services
                          are required as may be specified by the Company to
                          the Managers.

                 CC.      Post-Conversion Period

                          Upon completion of the conversion of the vessel, when
                          the Vessel is ready to commence Sea Trials, the terms
                          of the agreement shall apply in full thereafter, for
                          the remainder of this agreement.

8.       Early Termination of Management Agreement

8.1      The Company shall have the sole right to terminate this Management
         Agreement upon 35 days notice to Managers at any time and upon the
         expiry of such notice the Company shall pay a lumpsum cancellation fee
         of L. 150,000.00 (One Hundred and Fifty Thousand Pounds Sterling) to
         the Managers.  However, should the Company terminate this agreement in
         accordance with Clause 17. of this agreement, no cancellation fee
         shall then apply.

8.2      In the event of a termination of this Agreement in accordance with
         Clause 8.1. above the liability of Company to pay the Management Fees
         to Managers shall cease forthwith without prejudice to the rights of
         the parties in respect of any amounts due from one to the other at the
         time of termination and without prejudice to any claims which have
         arisen between the parties prior to the date of termination.

8.3      In the event of a termination of this Agreement for any reason
         whatsoever, Company and Managers shall undertake a joint survey of the
         Vessel to determine the condition of the Vessel and its equipment at
         such time, and Managers hereby warrant that the Vessel shall at the
         time of termination of this Agreement be in the same condition as at
         the time management of the Vessel commenced under Clause 2.1. above,
         fair wear and tear





                                       5
<PAGE>   7
         excepted, and Managers shall indemnify Company in respect of any
         breach of this warranty.

9.       Management Fees

9.1      Commencing from the time of commencement of the management of the
         Vessel by Managers until the time such management terminates in
         accordance with the provisions hereof and subject to Clauses 15, 19
         and 36, and the other relevant provisions of this Agreement Company
         shall pay to Managers the following fixed daily Management Fees (or
         pro rata for part thereof):

         AA.     Pre-Conversion Period     -       L. 2,625 (Two Thousand Six
                                                   Hundred and Twenty Five 
                                                   Pounds Sterling) Per day.

         BB.     Conversion Period         -       As AA, less the costs not
                                                   incurred whilst under 
                                                   conversion.

         CC.     Post-Conversion Period    -       As AA, plus "escalation" 
                                                   Clause 9.5 plus any insurance
                                                   rate differential.

         DD.     Should the Vessel operate outside Europe, the daily rates as
                 hereinabove stated shall be increased, whilst specifically in
                 such areas, by the following maximum percentages:

                 Mediterranean/Middle East/Africa      -   1.58% (One Point
                                                           Five Eight Percent)
                 United States Gulf and the Americas   -   2.37% (Two Point 
                                                           Three Seven Percent)
                 Far East/Australasia/Pacific          -   3.15% (Three Point 
                                                           One Five Percent)

9.2      The daily management fee stated in BB, hereinabove shall apply from
         the time the Vessel is delivered to Shipyard, whilst the Vessel is
         being converted by the Shipyard and shall be payable until such time
         that the Vessel proceed to sea after conversion or until latest 1st
         April 1991, whichever the earlier.  It is agreed that during the
         standby period, Managers will maintain a skeleton crew onboard, which
         will include at least one engineer and one catering member.  Company
         shall have use of the Vessel's passenger accommodation during the
         standby period and Managers shall provide catering facilities for the
         Company's personnel, as required, with Company paying Managers the
         victualling rate stated in Clause 10 herein.





                                       6
<PAGE>   8
9.3      Should the Company require Managers to increase the manning level, as
         stated in Clause 6. herein, Managers shall immediately increase the
         manning levels whereupon Company shall pay Managers daily increases in
         total costs, including all travelling expenses.

9.4      If due to special Local Legislation in any areas where the Vessel may
         operate during the currency of the agreement, where the Managers are
         required to change part of all of the Crew or increase the manning
         levels of the Vessel to comply with such special Legislation, Company
         shall reimburse Managers for any proven increase in crewing costs.

         This Clause shall not be construed to relieve Managers from their
         responsibility to provide at all times a fully qualified and
         certificated Crew onboard the Vessel for worldwide trading.

9.5      The daily Management Fees stated in Clause 9.1.CC shall be firm and
         remain fixed (subject to adjustment in accordance with the provisions
         of Clause 9.1.DD, 9.3. and 9.4. herein) until 31st March 1991.
         Thereafter the daily Management Fees referred to in clause 9.1.CC
         shall be increased on 1st April each year during the term of this
         Agreement by an amount equal to 85% of the percentage increase (if
         any) in the United Kingdom Retail Prices Index (or such other official
         United Kingdom Retail Price Index published in substitution thereof)
         for the month of March in that year over the figure of the United
         Kingdom Retail Price Index in respect of the month of March in the
         previous year.

10.      Victualling.

10.1     Managers will provide victualling, which shall include three main
         meals per day for the Company's personnel and/or their representatives
         onboard the Vessel at the fixed rate of L. 9 (Nine Pounds Sterling)
         per man per day.  For the Pre-Conversion Period, then at a rate to be
         agreed by latest 15th March, 1991 covering the balance of this
         Agreement.  However, this shall be subject to regular review between
         Company and Managers.

10.2     Managers shall maintain a qualified catering team consisting of three
         persons onboard the Vessel and meals shall be of high standard and
         menus will be varied.  The cook will provide the Company's Party
         Manager onboard with a monthly menu in advance and Company reserves
         the right to amend proposed menus, to ensure an acceptable level of
         victualling is always maintained.

10.3     Company's personnel on night duty shall be allowed access to the
         galley or other suitably designated area, where they can obtain cold
         salads or light snacks, it always being understood that the Vessel's
         catering personnel will not be on duty and that Company's own
         personnel shall not interfere with galley equipment.

10.4     The Vessels' stewards shall clean Company's cabins at least twice per
         week and change the linen once a week.  Company's personnel shall have
         access to at least one washing machine and a drying machine onboard.





                                       7
<PAGE>   9
10.5     The Master shall maintain a bond onboard the Vessel limited to beer,
         spirits and tobacco, which he shall procure at his own expense.  The
         Company's Party Chief, solely on behalf of the Company's own
         personnel, shall be at liberty to purchase such items from the Master
         at cost plus ten percent.

10.6     Company and Managers agree that any personnel in their employment
         found to be under the influence of alcohol or drugs whilst onboard the
         Vessel, shall be subject to instant dismissal.

11.      Payment

11.1     Managers shall invoice Management Fees and victualling charges or
         other amounts due from time to time hereunder per calendar month,
         whereby Managers shall invoice Company on the fifteenth day of each
         month worked and Company shall pay Managers so that the funds are
         received by managers within thirty days of their invoice date.

11.2     In default of payment the Managers shall immediately inform Company in
         writing of such default and should such default not be rectified
         within seven days from such notice being given, the Mangers shall have
         the right to withdraw their services from the Vessel after first
         proceeding to a safe port, without noting any protest and without
         interference by any Court or any other formality whatsoever and
         without prejudice to any claim the Managers may otherwise have on the
         Company under this Agreement.

11.3     Managers invoices for other costs due from Company shall be
         accompanied by supporting documentation and shall be submitted to
         Company whereafter Company shall make payment to Mangers within thirty
         days from the invoice date.

12.      Modifications and Additions to Vessel

12.1     Upon commencement of the management of the Vessel under Clause 2.1.
         herein, Managers shall always ensure Company, their agents and
         servants have full access at all times to the Vessel to undertake
         modifications to the Vessel and embark and install their equipment.

12.2     All structural modifications and alterations undertaken by the Company
         their agents or servants to the Vessel shall be at the Company's own
         cost and shall be to the approval of the Vessel's Classification
         Society and/or other relevant safety authorities.

13.      Responsibility & Exemption

13.1     Company shall not be responsible for loss or damage to any property of
         Managers, nor any personal injury or death of Managers personnel
         howsoever or by whomsoever caused, even if caused by act, neglect,
         default of Company, and Managers agree to indemnify





                                       8
<PAGE>   10
         Company against all consequences and liabilities arising from and in
         connection with such loss or damage of personal injury or death of
         Managers' personnel.

13.2     Provided Managers shall have complied with the insurance requirements
         of Clause 14. hereof Managers shall not be responsible for damage to
         property of Company nor for personal injury or death of Company's
         personnel howsoever or by whomsoever caused, even if caused by act,
         neglect or default of Managers and Company agrees to indemnify
         Managers against all consequences and liabilities arising from or in
         connection with such loss or damages or personal injury or death of
         Company's personnel.

13.3     The Managers hereby agree to indemnify and hold harmless Company from
         and against any loss of liability (including legal expenses) arising
         out of any claim or cause of action for loss of damage to property of
         third parties or for injury to or loss of life of any third person,
         caused by neglect or default on the part of Company.

14.      Insurance

14.1     The Managers agree to maintain at their expense, for the
         Pre-Conversion Period, until the Vessel enters the Shipyard, the
         marine insurance policies for the Vessel within Norwegian trading
         warranties, namely:

                 "Hull and Machinery" (All Risks) including War Risks and
                 Collision Liability - sum insured up to full value of the
                 vessel being N.Kr 100,000,000 (One Hundred Million Norwegian
                 Kroner).

                 "Protection & Indemnity" - sum insured up to full value of the
                 Vessel, including Wreck Removal with unlimited, as per rules
                 of P&I Club and including Oil Pollution liability indemnity up
                 to a maximum of US$ 500,000,000 (Five Hundred Million United
                 States Dollars).

                 "Workman's Compensation and Employees' Liability" insurance or
                 coverage of a comparable nature to the full extent required by
                 the Laws applicable in any jurisdiction relative to Managers
                 employees.

                 The above insurances will be subject to review prior to the
                 Vessel completing conversion.

14.2     The Registered Owners and Company shall be named as joint assured in
         Managers placed in insurance policies for Hull & Machinery for the
         Protection & Indemnity.  In the context of this provision, Company
         shall include any of its named clients having an interest in the
         operation for which the activities as described in Clause 1 hereof are
         being performed.





                                       9
<PAGE>   11
14.3     Whenever called for under any contracts with Company's clients,
         managers to produce to Company a certificate or a certified copy of
         the insurance policies effected in accordance with the provisions of
         this Agreement or such other confirmation as may be acceptable to the
         Company.

         If Managers fail to or refuse to obtain or maintain any insurances
         required by the clients under Company's contracts with them, then
         Company shall have the right to procure such insurance at Managers'
         expense in which event any amount paid to secure such insurance shall
         immediately become due and payable by Managers.

14.4     Neither party to this agreement shall be liable to the other for any
         consequential or special damage.

15.      Damage or Breakdown of Vessel

15.1     Subject to Clause 19, any event of whatsoever nature which hinders or
         prevents the full working of the Vessel including (but not limited to
         the generality of the foregoing) drydocking or other necessary
         measures to maintain the efficient operation of the Vessel, deficiency
         of men or stores, strike of Master, officers or crew, breakdown of
         machinery or equipment, damage to hull or other accident (whether or
         not required by Company and whether or not due to negligence of
         Managers), no Management Fees shall be payable by Company during the
         period in which the Vessel and her equipment is not fully operational
         (whether or not required for service) and pro rata for any part
         thereof.

15.2     The provisions of Clause 15.1 herein shall include the specific events
         stipulated in Clause 36 whereby Company shall be released from any
         liability to pay Management Fees for the duration of such events as
         further specified in Clause 36 herein.

16.      Loss of Vessel

16.1     Should the Vessel be lost or missing, this Agreement shall be deemed
         to have been terminated and management fees to cease from the date
         when the Vessel was lost.  If the date cannot be ascertained, fifty
         percent of the daily management fee shall be paid from the date the
         Vessel was last reported until the calculated date of arrival at her
         destination.


17.      Cancellation

17.1     In the event of Company being released from its liability to pay to
         Managers the management Fees in accordance with the terms of this
         Management Agreement for thirty consecutive days or in the event of a
         material breach by Managers of the provisions of this Agreement,
         Company shall have the option of cancelling this Agreement.  Company,
         if required by Managers, to declare within forty-eight hours after
         receiving notice whether they cancel this Agreement or not.  In
         default of any written notice from Managers





                                       10
<PAGE>   12
         Company have the right of automatically cancelling this Agreement at
         any time after the said period of 30 days or breach, without noting
         any protest and without interference by any Court, any formality
         whatsoever and without prejudice to any claim the Company may
         otherwise have on the Managers.

18.      Masters and Crew

18.1     The Master to prosecute all voyages and operations with the utmost
         diligence and despatch, and, so comply fully and accurately with the
         operating schedules laid down by the Company and their party manager,
         without compromising the safety of the ship and/or of the Crew.  The
         Master to be under the orders of Company as regards employment or
         agency.

                 The Company shall advise the Master as to general location of
                 the Vessel's operational area and the Master shall be solely
                 responsible for the selection of the route from and to such
                 area.

                 If the Master shall reasonably consider that the instructions
                 given by the Company or their party manager may endanger the
                 safety of the Vessel and/or of the Crew, he must advise the
                 party manager accordingly and the Master is entitled not to
                 follow such instructions.

                 The Master, Officers and Manager's Crew will fully
                 co-operation with the Company, their party manager and crew,
                 with a view to the full and satisfactory performance of the
                 service.

18.2     If the Company has good reason to be dissatisfied with the conduct of
         the Master, Officers or ratings of Managers crew, the Manager shall as
         soon as possible replace the person or persons in question.
         Immediately after such replacement or replacements a joint
         investigation by Company and Managers shall be conducted in order to
         ascertain that such complaint or replacement was reasonable to ensure
         a continuous smooth operation.  Notwithstanding the foregoing, any
         member of the Vessel's crew found to be under the influence of alcohol
         or drugs, shall be, as far as practically possible, immediately
         removed from the Vessel.


18.3     The Vessel to work day and night, if required, without any extra
         payment by the Company.

18.4     The Master and engineer to keep full and correct logs accessible to
         the Company or their agents at all times.

18.5     Decisions concerning the safety of the Vessel and/or the personnel
         onboard shall be the responsibility of the Vessel's Master.  The
         safety of the Company's seismic equipment,





                                       11
<PAGE>   13
         whether on board or deployed from the Vessel, is, however, the sole
         responsibility of the Company, through the auspices of the Party
         Chief.

18.6     Should the Company have reason to be dissatisfied with anything for
         which the Managers are responsible, Company shall promptly inform
         Managers in writing whereafter Managers will promptly look into the
         matter.

19.      Maintenance of Vessel

19.1     Notwithstanding the provisions of Clause 15 herein, Company shall
         allow Managers one day of 24 hours per calendar month or pro rata for
         part thereof for maintenance and/or overhaul and/or repairs at times
         to be mutually agreed between both parties and during such period
         Company shall continue to be liable to pay to Managers the Management
         Fees.  Days can be accumulated up to a maximum of twelve days but days
         not taken by managers will not be compensated by Company at the end of
         this agreement.  Any planned drydocking and/or overhauls and/or
         repairs are to be coordinated with Company but should be scheduled
         between 1st December and 1st March each year.  Company shall, however,
         have the right to request Managers to bring forward planned
         maintenance and/or drydockings and/or overhauls and/or repairs or,
         subject to classification approval, delay same to be coordinated with
         Company's own planned maintenance, repairs and renewals.

19.2     Notwithstanding the provisions of Clause 15 herein, Company shall
         allow Managers to carry out maintenance or overhaul of the Vessel when
         Company's own equipment is being maintained, repaired or overhauled
         provided that the services of the Vessel are not immediately required
         by Company and during such period Company shall continue to pay to
         Managers the Management Fees.  Should, however, the Vessel not be
         ready to sail as required by Company the Management Fees for such
         period shall cease to be payable by Company to the Managers, backdated
         to the time Managers originally commenced any maintenance or overhaul
         of the Vessel (other than days allowed in accordance with Clause 19.1
         above).

20.      Salvage

20.1     All salvage and all proceeds from derelicts other than Company's
         property shall be divided equally between the company and Managers
         after deducting the Master's, Officers', Crews' and Company's
         personnel's share, hire of Vessel for time lost and cost of the fuel
         consumed and all other expenses (including Crew and Company's
         personnel costs) incurred.  Apportionment of all loss of time and all
         expenses paid, excluding damage to or loss of the Vessel incurred in
         saving or attempting to save life and in unsuccessful attempts to
         salve shall be mutually agreed between Company and Managers prior to
         any salvage attempts.  No attempt to undertake salvage shall be made
         by the Vessel unless such has been mutually agreed between the parties
         or unless there is a legal obligation upon the Master or Managers to
         carry out salvage.





                                       12
<PAGE>   14
21.      War

21.1     The Vessel, unless the consent of the Managers be first obtained, not
         to be ordered nor continue to any place or on any voyage nor be used
         on any service which will bring her within a zone which is dangerous
         as a result of any actual or threatened act of war, war hostilities,
         warlike operations, acts of piracy or of hostility or malicious damage
         against this or any other Vessel or its cargo by any person, body or
         state whatsoever, revolution, civil war, civil commotion or the
         operation of international law, nor be exposed in any way to any risks
         or penalties whatsoever consequent upon the imposition of sanctions
         nor carry any goods that may in any way expose her to any risks of
         seizure, capture, penalties or any other interference of any kind
         whatsoever by the belligerent or fighting powers or parties or by any
         Government or Ruler.

21.2     Should the Vessel approach or be brought or ordered within such zone,
         or be exposed in any way to the said risks (1) Managers to be entitled
         from time to time to insure their interests against any of the risks
         likely to be involved thereby on such terms as they shall think fit,
         Company to make a refund to the managers of the premium on demand and
         (2) notwithstanding the provisions of Clause 15 Management Fees to be
         paid by Company to Managers for all time lost, including any time lost
         owing to loss or injury to the Master, officers or crew or to the
         action of the crew in refusing to proceed to such zone or to be
         exposed to such risks.

21.3     Any action of Managers in accordance with the provisions of this
         Clause 21 shall not be deemed contrary to the instructions of Company.

21.4     If in the compliance of the provisions of this Clause anything is done
         or is not done, such not to be deemed a deviation.

22.      Secrecy

22.1     All information regarding Company's and their clients' operation,
         investigations and findings, together with the nature and
         specification of Company's equipment installed on board the Vessel
         shall be regarded as confidential to Company and under no
         circumstances shall any such information be divulged to unauthorized
         persons or the Press without the prior written permission of Company.

23.      Assignment

23.1     Managers rights and obligations under this Agreement are not
         assignable or transferable in whole or in part without Company's prior
         written approval which it shall have the right to withhold.





                                       13
<PAGE>   15
24.      Travel Expenses

24.1     Outside United Kingdom traveling expenses related to crew changes
         shall be borne by Company and shall be re- invoiced by managers to
         Company at cost in accordance with Clause 11 herein.

25.      Vessel's Name/Colours/Markings

25.1     During this Agreement Managers shall not change the name, markings or
         colours of the Vessel without Company's permission or unless Company
         instructs Managers to do so.

26.      Force Majeure

26.1     Any delay or failure to carry out the duties imposed upon either party
         under this agreement shall not be deemed to be a breach thereof if
         such delay or failure results from a force majeure event beyond the
         control of the party affected.  In the event that a force majeure
         situation occurs, both parties shall promptly consult and agree a
         course of action.

27.      Arbitration

         This agreement shall be governed by English law and any dispute
         arising under this Charter shall be referred to arbitration in London.
         One Arbitrator to be nominated by Company and the other by the
         Managers and in case the Arbitrators shall not agree then to the
         decision of an Umpire to be appointed by them, the award of the
         Arbitrators or the Umpire to be final and binding upon both parties.

28.      Notices

         All notices due under this agreement shall be given in writing to:
<TABLE>
<CAPTION>
                 Company                           Managers
                 <S>                               <C>
                 Simon-Horizon Limited             Ervik Marine Services A/S
                 Horizon House,                    Brunholmgt 2,
                 Azalea Drive,                     N-6004 Alesund,
                 Swanley,                          Norway.
                 Kent, BR8 8JR
                 United Kingdom

                 Mr. B.E. Timmins                  Mr. E.A. With
                 Corporate Development Director    Member of the Board


                 For the Company                   For the Managers
</TABLE>





                                       14
<PAGE>   16
SCHEDULE A


<TABLE>
<CAPTION>
1.       Main Description
<S>      <C>                               <C>
         Vessel                            "SEAWAY LABRADOR"
         Flag                              Bahamas
         Built                             Brattvag Skipsinredning A/S
                                           (1982/1983)
         Converted                         Brattvag/Liaaen (1983)
         Design                            ME 202 Platform Supply/Liaaen 
                                           ROV-Survey
         Classification                    DnV + 1A1 (MV), EO, SF Supply 
                                           Vessel, Helideck
         Call Sign                         C6DQ3


2.       Measurements

         Dimensions

         Length o.a.                       67.2m (220.4')
         Length b.p.                       60.0m (196.8')
         Breadth                           16.8m (55.1')
         Depth moulded                     7.1m (23.3')
         Max Draft                         6.07m (19.9')
         Draft                             5.5m (18.03')
         Gross Registered Tons             1905 tons
         Max. Speed                        12.5 knots
         Max. Deck Load                    abt. 300 tons (as presently 
                                           configured)


3.       Capacities

         Fuel oil                          950 m3
         Fresh water                       650 m3
         Ballast water                     1130 tons
         Lube oil                          29,000 litres


4.       Lube Oil Consumption

         Lube Oil                          83 litres per day
</TABLE>





                                       15
<PAGE>   17
<TABLE>
<CAPTION>
5.       Machinery
         <S>                               <C>
         Main Engines                      4 x Wartsila WASA 8 R 22 HF each 
                                           1725 BHP, total 6900 BHP. Diesel 
                                           electric system designed to burn MDO.

         Bow thrusters                     2 x 900 BHP (1324 kw) Brunvoll var.
                                           pitch. Thrust: 2 x 10.6 tons.

         Stern thrusters                   2 x 2000 BHP (2940 kw), Main 
                                           Azimuth, 360 degrees rotating 
                                           thrusters.  Two speeds available 
                                           for economical operations.

         Main Generators                   4 x 1220 kw

         Harbour Generator                 165 kw
</TABLE>

         Power for computers and other electronic equipment (3 Phae, 440 V, 60
         Hz) is available through a "smooth current" clean power system.


7.       Helicopter Deck

         Helideck installed midship designed for BELL 212 helicopters according
         to Norwegian Maritime Directorate regulations and in compliance with
         Helicopter service's recommendations.


8.       Stabilization

         Passive stabilization for roll reduction.


<TABLE>
<CAPTION>
9.       Moonpool
         <S>                               <C>
         Dimensions                        2.8 x 4.5 m (nominal)
</TABLE>


<TABLE>
<CAPTION>
10.      Navigation and Electrical Instrumentation
         <S>                               <C>
         Radar                             Two Furuno FR 1221 (3 cm)
         Gyro                              Two Robertson SKR 82 Gyros
         Autopilot                         Robertson
         Radiodirection finder             Furuno FD 120B
         AP Navigator                      Type FD (decca main chain)
</TABLE>





                                       16
<PAGE>   18
<TABLE>
         <S>                               <C>
         Echosounder                       Furuno FE 881
         Echosounder                       Simrad EA 200 with dual transducers
                                           (38 and 200 KHz) and Anschutz heave
                                           compensator
         Electromagnetic log
         (Doppler)                         JRC Type JLN 203

         Magnetic Compass                  Neptun 10" RK10

         Two SSB radios                    SKANTI TRP 500 (Radiostation is not
                                           approved for Worldwide trading).
         One Telex                         SAIT XH 5111 TP
         Four VHF Radios                   Sailor RT 143/145

         3 Handheld UHF radios
</TABLE>

       A platform above obstructions for mounting of navigation antennae.


<TABLE>
<CAPTION>
11.      Accommodation
         <S>                               <C>
         Cabin capacity:                   21 single cabins w/shower (11-12 available to charterer)
                                           8 double cabins w/shower (305 available to charterer)
                                           4 double cabins without shower (4 available to charterer)
                                           1 hospital
</TABLE>

         All accommodation fully air conditioned.


                                  +++++++++++

         Post-Conversion specifications to be inserted and attached to this
agreement.





                                       17
<PAGE>   19
         FIRST ADDENDUM OF M.V. "SEAWAY LABRADOR" MANAGEMENT AGREEMENT DATED
19TH DECEMBER, 1990 BETWEEN SIMON-HORIZON LIMITED AND ERVIK MARINE SERVICES

- --------------------------------------------------------------------------------



This first Addendum dated 19th December, 1990 is deemed to be incorporated in
the Management Agreement dated 19th December, 1990.


36.      Special Conditions

         If any of the undermentioned events shall occur Company's liability to
         pay the Management Fees shall be suspended in full for the duration of
         such event or events when and as often as the same shall from time to
         time occur.

         The right of Company to suspend payment of the Management Fees during
         the occurrence of such event may be waived temporarily by the Party
         Chief on behalf of Company but cannot be permanently waived unless
         expressly agreed in writing between Company and Managers.  A temporary
         waiver may be withdrawn at any time by notice from the Party Chief to
         the Master.  During the period of any such waiver the full daily
         Management Fees shall continue to be paid.

36.1     Accommodation

         Failure to provide accommodation as follows:

A.       All accommodation in the aft deck module shall be available to the
         Company at all times unless, if required through operational necessity
         of legal requirement, there is a need to release one berth for
         Manager's Radio Officer.

B.       The conference room and offices (within the module) may be
         redesignated by the Party Chief even if this curtails their use as
         public areas by Crew.

C.       The Party Chief shall be allocated the former Chief Engineer's suite
         in the bridge accommodation.

D.       All other accommodation shall be available to Manager's Crew.  It is
         recognised that Manager's accommodation exceeds actual requirements
         and when necessary this excess accommodation shall be made available
         to Company's personnel.





                                       18
<PAGE>   20
36.2     Catering

         Failure to provide the following catering facilities:

A.       Company requires three cooked means per day.

B.       Company requires reasonable access between 1900 and 0500 hours to cold
         and dry stores to provide light refreshments and means for themselves.

36.3     Propulsion

         Failure to meet the minimum technical requirements set out below:

A.       The Vessel should have four working diesel generators sets at all
         times.  Any one diesel generator set may be shut down for up to twelve
         continuous hours for minor repairs and maintenance, after prior notice
         (if possible) to Company's representative.  This condition can be
         waived by prior agreement between Company and Managers.

B.       The Vessel shall have two fully operational azimuth thrusters at all
         times.

C.       The Vessel shall have one of the two bow thrusters fully operational
         at all times.

36.4     Electrical Supply

         Failure to meet the following electrical requirements:

A.       A minimum of one megawatt of power 600 volts is required at a
         distribution point in the aft working module.

B.       A domestic power supply suitable for domestic appliances and
         instrument room and work shop lighting shall be maintained.

         4A and 4B are required 24 hours a day.

36.5     Specific Equipment

         Failure of any of the following specific equipment to operate as
         reasonably expected by Company or to manufacturer's specifications:

A.       Bridge radar (both radars to be working when Vessel leaves port).

B.       Auto pilot.

C.       Gyro compass.





                                       19
<PAGE>   21
D.       Aft deck crane.

E.       Ship's intercom.

F.       VHF/MF radios.

36.6     General Equipment, Services, Crew

A.       Any failure to meet the requirements of the appropriate classification
         society, flagging authority or insurance requirements.

36.7     Performance

         Failure to meet any of the following performance requirements:

A.       The Vessel shall be capable of an average cruising speed of 10 knots
         at an average fuel consumption of 10 tonnes per twenty four hours, or
         less.

B.       The Vessel shall be able to demonstrate and maintain a speed of 12
         knots in a sea state of up to force four, using an average of 15
         tonnes of fuel oil, or less, per twenty four hours.

C.       The Vessel shall be capable of meeting the requirements of 4B and 9E
         (electrical supply) whilst in port, by using a standby or 'shore
         generator' with a fuel consumption or less than 2 tonnes per twenty
         four hours.

D.       The Vessel shall be capable of anchoring in water depths of up to 100
         metres.

36.8     Endurance

         Failure to maintain the following:

         The Vessel shall have a potential endurance of 65 days and in
         particular shall have the following usable tank capacities:

<TABLE>
         <S> <C>                                   <C>
         A.  Fuel oil tank capacity                950 cubic metres
         B.  Lube oil tank capacity                29 cubic metres
         C.  Fresh water tanker capacity           650 cubic metres
</TABLE>

36.9     Provision of Equipment

         Managers shall provide the following equipment for unsupervised use by
         Company's personnel.  Maintenance, repair and provision of consumables
         for the equipment shall be for Company's account:





                                       20
<PAGE>   22
A.       Echosounder Type Simrad EA 200 or similar.

B.       Satellite Communications System Type Magnavox and one Telefax machine.

C.       Instrument Room Radar Repeater System Type Furuno or similar.

36.10    Additional

A.       Fuel, port calls and other charges accuring during the period where
         Company is not liable to pay the Management Fees in accordance with
         the terms of this Agreement shall be charged to Managers Account.

B.       No Management Fees shall be payable by Company to Managers should the
         Vessel fail to maintain course/speed to Company's requirements due to
         Vessel malfunctions or operator error/deficiency.

C.       Company shall not pay to Managers the Management Fees in respect of
         delays to the Vessel in leaving port due to the Vessel/personnel not
         being ready and any consequential delays (e.g., tides, etc.) provided
         reasonable notice shall have been given to Managers by Company for
         departure.

D.       In relation to any event where Company is relieved from its obligation
         to pay Management Fees in accordance with this Agreement Company shall
         only be obliged to recommence payment of the Management Fees upon
         reasonable evidence from Managers to Company that the relevant event
         has ceased and the Vessel is returned to an equally favourable
         position after the occurrence of such event.





         /s/ B.E. Timmins            /s/ [signature illegible]
         For the Company             For the Managers
                           
         19 Dec '90        





                                       21

<PAGE>   1
                                                                  EXHIBIT 10.9.3

                                               [SIMON GEOPHYSICAL SERVICES LOGO]

                                                          Simon-Horizon Ltd.
                                                          Horizon House
                                                          Azalea Drive
                                                          Swanley
                                                          Kent BR8 8JR
                                                          England

                                                          Telephone 0322 68011 
                                                          Telex 896050 EXPLOR G
                                                          Facsimile 0322 613650
                                                        

Ervik Marine Services A/S
Brunholmst 2
N-6004 Alesund
Norway




Dear Sirs,


                          RE:  M.V. "SEAWAY LABRADOR"


In consideration of Simon-Horizon Limited ("SHL") entering into an agreement to
sell the M.V. "Seaway Labrador" to Royal Bank of Scotland (Industrial Leasing)
Limited and charter the vessel back under a demise charter party to be entered
into, for a period of 10 years, it is agreed that:

"Net Residual Value" - the market value of the vessel (excluding all seismic
equipment on board the vessel) at the expiry if the ten year demise charter
term, less the termination costs of the demise charter, less the costs of
valuation, broking and legal fees.

1.       SHL covenants to Ervik Marine Services A/S ("EMS") (or substitute
         company thereof as approved by SHL) the right to 56% of the Net
         Residual Value of the vessel on completion of the 10 year Management
         Agreement.

2.       Should SHL exercise their right under the Management Agreement dated
         19th December, 1990, to terminate the Management Agreement in
         accordance with Clause 8.1. thereof, EMS's right to x% of the New
         Residual Value of the vessel shall remain frozen from the time the
         Management Agreement is terminated until the expiry of the ten year
         demise charter term.

         "x" percent is to be 24% from the outset to year one, rising after
         year one from 24% to 56% after 10 years.  Pro-rata values apply to
         interim periods at monthly intervals.
<PAGE>   2
                                      -2-




3.       In the event that SHL exercise their right to cancel the Management
         Agreement under Clause 17, subject to Clause 26, thereof, EMS's right
         to y% of the New Residual Value of the vessel shall remain frozen from
         the time the Management Agreement is terminated until the expiry of
         the ten year demise charter term.

         "y" percent is to be 24% after one year and 49% after ten years.
         Pro-rata values apply to interim periods at monthly intervals.


                 Signed                                Signed
                                                       
                                                       
                 /s/ B.E. Timmons                      /s/ [illegible signature]
                                                       
                 Simon-Horizon Ltd.                    Ervik Marine Services A/S
                                                       
                                                       
                                                       
                                                       Dated 19th December, 1990

<PAGE>   3
                                                          Draft illustrations to
                                                      side letter No. 2 19/12/91

                          Proposed pro-rata accrual
                           of "Net Residual Value"

                                      
                                      


                              [DIAGRAM NOT SHOWN]





                 1.       Where termination of the agreement is undo clause two
                          of the side letter the proportion of "Net Residual
                          Value" earned is higher proportion of the value.

                 2.       Where termination of the agreement is under clause
                          three the proportion is as previously agreed.

                 3.       In both cases EMS is entitled to 24% of NRV after the
                          first year.

                 4.       All time points in between should be given pro-rata
                          values.

<PAGE>   1

                                                                          10.9.4

DATED                                                            15th July 1994
- --------------------------------------------------------------------------------




                             SIMON-HORIZON LIMITED

                                    - and -

                          HORIZON EXPLORATION LIMITED





- --------------------------------------------------------------------------------

                              ASSIGNMENT AGREEMENT

                                  Relating to

                          A Ship Management Agreement
                     dated 19th December, 1990 (as amended)

- --------------------------------------------------------------------------------






                               SIMMONS & SIMMONS
                               14 Dominion Street
                                London LC2M 2RJ
<PAGE>   2
THIS ASSIGNMENT AGREEMENT is made the 15th day of July 1994

B E T W E E N:

(1)      SIMON-HORIZON LIMITED registered no. 467924 whose registered office is
         at Horizon House, Azalea Drive, Swanley, Kent BR8 8JR (the
         "Assignors); and

(2)      HORIZON EXPLORATION LIMITED registered no. 2804983 of 6 Pembroke Road,
         Sevenoaks, Kent TN13 1XR (the Assignees)

WHEREAS:

(A)      By a management agreement (the "Management Agreement") dated 19th
         December, 1990 as amended by a First Addendum thereto of the same date
         the Assignor appointed Ervik Marine Services A/S as manager (the
         "Manager") of the Vessel M.V. "SIMON LABRADOR".

(B)      The Assignor has by three "side letters" (the "Side Letters") each
         signed by Simon Petroleum Technology and addressed to and
         countersigned by the Manager by way of agreement with the terms
         thereof and dated 19th December, 1990 agreed certain other matters

(C)      The Assignor and Assignee have agreed subject to the satisfaction of
         certain terms and conditions that the Assignor shall (inter alia)
         charter the M.V. "Simon Labrador" (the "Vessel") to the Assignee by
         way of sub-demise and that the Assignee shall (inter alia) assume and
         be responsible for the discharge of all liabilities of the Assignor in
         respect of the Vessel including under and in connection with the
         Management Agreement

(D)      It has been agreed that, upon and subject to the terms and conditions
         of this Agreement, the Assignor will assign to the Assignee all rights
         and benefits of the Assignor under the Management Agreement.

NOW THEREFORE IT IS HEREBY AGREED as follows:

1.       Definitions

         (a)     Terms defined in the Management Agreement shall, unless
                 otherwise defined herein, have the same meanings in this
                 Agreement and, in addition to the expressions defined above,
                 in this Agreement and in the Recitals:

                 "Agreement" means this agreement as amended or modified from
                 time to time and includes all other documents supplemental to,
                 collateral with, or derived from this Agreement;





                                     - 2 -
<PAGE>   3
                 "Assigned Rights" means all of the right, title and interest
                 of the Assignor in and to and all benefits of the Assignor
                 under the Management Agreement and the Side Letters; and

                 "Effective Date" means 30th June, 1994.

         (b)     Unless the context forbids, any references in this Agreement
                 to:

                 (1)      an "agreement" also includes a concession, contract,
                          deed, franchise, license, treaty or undertaking and
                          any waiver or release (in each case whether oral,
                          written, implied or by operation of law);

                 (2)      a "consent" also includes an approval, authorization,
                          exemption, filing, license, order, permission,
                          recording or registration (and references to
                          obtaining consents shall be construed accordingly);

                 (3)      a "law" includes common or customary law and any
                          decree, judgment, legislation, order, regulation,
                          statute, treaty or other legislative measure, in each
                          case of any jurisdiction whatever (and "legislation",
                          "lawful" and "unlawful" shall be construed
                          accordingly);

                 (4)      a "person" includes any individual, company,
                          corporation, firm, partnership, joint venture,
                          association, organization or trust (in each case,
                          whether or not having separate legal personality) and
                          references to any of the same shall include a
                          reference to the others;

                 (5)      "writing" or "written" includes any means of visible
                          reproduction;

                 (6)      words denoting the singular shall include the plural
                          and vice versa;

                 (7)      any legislation are to that legislation as from time
                          to time amended or re-enacted, and to any document,
                          agreement or deed whatsoever shall include the same
                          as it or they may at any time be amended, varied or
                          supplemented;

                 (8)      Clauses, references to clauses hereof; and





                                     - 3 -
<PAGE>   4
                 (9)      subclauses are, unless otherwise stated, references
                          to subclauses of the Clause in which the reference
                          appears.

         (c)     Clause headings and sub-headings are for convenience only and
                 shall not affect the construction hereof.

2.       Assignment

         (a)     With effect from the Effective Date the Assignor hereby
                 assigns (subject to the terms and conditions of this
                 Agreement) to the Assignee without recourse the Assigned
                 Rights together with all (subject as otherwise provided
                 herein) rights and benefits accruing to the Assignor in
                 relation thereto under the Management Agreement, such
                 assignment being made in consideration of the undertakings by
                 the Assignee contained in Clause 3 below.

         (b)     Immediately following the execution and delivery of this
                 Agreement by the parties hereto they shall jointly give notice
                 to the Manager of the assignment to the Assignee of the
                 Assigned Rights.

3.       Undertakings

In consideration of the assignment by the Assignor to the Assignee of the
Assigned Rights, the Assignee agrees with effect from the Effective Date to
accept the assignment in Clause 2 without recourse, and undertakes to perform
the obligations of the Assignor arising on or after the Effective Date under
the Management Agreement and in respect of the Assigned Rights and the Side
Letters and to be bound by the terms of the Management Agreement and the Side
Letters as if originally named therein as a party thereto in place of the
Assignor.

In addition, the Assignee undertakes in consideration of the assignment
aforesaid that it will use all reasonable endeavors to supply at the cost of
the Assignor all information that may reasonably be requested by the Assignor
in respect of any matter or thing that may have occurred in connection with the
Management Agreement and/or the Side Letters prior to the Effective Date and
otherwise to assist the Assignor in connection with any dispute or discussion
with the Manager in respect of any matter or thing prior to the Effective Date
arising out of the Management Agreement and/or the Side Letters.

4.       Excluded Rights

         (a)     The Assignee shall not be entitled to sums due or owing by or
                 claimed against the Manager arising, accruing or paid prior to
                 the Effective Date to the Assignor in connection filth the
                 Assigned Rights and all such amounts





                                     - 4 -
<PAGE>   5
                 (together "Retained Amounts") shall belong to and be retained 
                 by the Assignor.

         (b)     If any amount (other than any Retained Amounts) is received or
                 recovered by the Assignor in respect of the Assigned Rights on
                 or after the Effective Date, the Assignor shall promptly (and
                 in any event within 15 days of receipt) pay such amount to the
                 Assignee.

         (c)     If any amount of the Retained Amounts is received or recovered
                 by the Assignee, the Assignee shall promptly (and in any event
                 within 15 days of receipt) pay such amount to the Assignor.

5.       Payments

Any payment to be made between the Assignor and the Assignee hereunder shall be
made in the currency in which such amount was received by the party so paying
and shall be made in immediately available funds and clear of all withholdings
for or on account of any taxes, counterclaims or set-offs or otherwise
howsoever arising.

6.       Representations

The Assignee represents and warrants to the Assignor that:

         (a)     it has full power and authority and has taken all action
                 necessary to execute this Agreement and all other documents to
                 be executed in accordance herewith and no governmental
                 authorisations are required in connection with the execution,
                 delivery or performance of this Agreement and such other
                 documents; and

         (b)     this Agreement constitutes its legal, valid and binding
                 obligations.
 
7.       Regulations and other Requirements

         (a)     Neither the Assignor nor any of the Assignor's directors,
                 officers, employees or agents shall be responsible for the due
                 execution, legality, validity, effectiveness, enforceability
                 or sufficiency of the Management Agreement or the Side
                 Letters, or any notice, certificate or document executed or
                 delivered thereunder nor for any action taken or omitted to be
                 taken thereunder or for any loss, liability or expense
                 suffered or incurred in consequence thereof by the Assignee
                 and the Assignee hereby acknowledges the absence of any such
                 obligation as is referred to in this sub-clause.





                                     - 5 -
<PAGE>   6
         (b)     The Assignee acknowledges that the Assignor is not agent for
                 the Manager or Royal Bank of Scotland (Industrial Leasing)
                 Limited ("RBS") nor does the Assignor have any responsibility
                 for either of them.

         (c)     The Assignor makes no representation or warranty and assumes
                 no responsibility with respect to any statement, warranty or
                 representation by RBS or the Manager or by any other person in
                 or in connection with the Management Agreement or the Side
                 Letters or in any notice, certificate or document executed
                 thereunder or with respect to the performance by either of
                 them or any other person of any of its or their respective
                 obligations under or in relation to the Management Agreement
                 or the Side Letters or any notice, certificate or document
                 executed or delivered thereunder; in particular, without
                 limitation, if the Manager shall fail to perform any of its
                 obligations under the Management Agreement or any document
                 relating thereto, the Assignee shall have no recourse to the
                 Assignor in respect of such failure and the Assignee hereby
                 acknowledges the absence of any such obligation as is referred
                 to in this sub-clause.

         (d)     The Assignor and the Assignee agree and acknowledge that the
                 Assignor does not have and shall not at any time hereafter
                 have any obligation to repurchase or accept a re-assignment of
                 the Assigned Rights or any part thereof.

8.       Indemnity by Assignee

         (a)     The Assignee shall indemnify the Assignor and keep the
                 Assignor indemnified from and against all losses, costs,
                 expenses, demands and damages whatsoever which the Assignor
                 may suffer or incur in respect of any liability or obligation
                 arising on or after the Effective Date under the Management
                 Agreement and the Side Letters in respect of any period
                 commencing on or after the Effective Date and in respect of
                 any other of the Assigned Rights or any part thereof.

         (b)     This indemnity shall continue in full force and effect
                 notwithstanding completion of the other matters referred to in
                 or connected with this Agreement.

         (c)     The certificate of the Assignor as to the amount of any such
                 loss, cost, expense, demand or damage suffered or incurred by
                 it as aforesaid shall be prima facie evidence of such matters.





                                     - 6 -
<PAGE>   7
9.       Indemnity by Assignor

         (a)     Save as otherwise provided in Clauses 5 and 8, the Assignor
                 shall indemnify the Assignee and keep the Assignee indemnified
                 from and against all losses, costs, expenses, demands and
                 damages whatsoever which the Assignee may suffer or incur in
                 respect of any liability or obligation arising at any time
                 under the Management Agreement in respect of any period prior
                 to the Effective Date and in respect of the Assigned Rights or
                 any part thereof notwithstanding that such liability or
                 obligation may not actually become due and payable until on or
                 after the Effective Date.

         (b)     This indemnity shall continue in full force and effect
                 notwithstanding completion of the other matters referred to in
                 or connected with this Agreement.

         (c)     The certificate of the Assignee as to the amount of any such
                 loss, cost, expense, demand or damage suffered or incurred by
                 it as aforesaid shall be prima facie evidence of such matters.

10.      Notices

All notices, demands or other communications under or in connection with this
Agreement shall be sent by letter, telefax or telex:

         (a)     if to the Assignor

                 Horizon House
                 Azalea Drive
                 Swanley
                 Kent TN13 1XR
                 Attn: Company Secretary
                 Telex No: 896050 EXPLOR G
                 Fax No: 0322 613650

         (b)     if to the Assignee to its office at

                 6 Pembroke Road
                 Sevenoaks
                 Kent TN1 1XR
                 Attn: Company Secretary
                 Telex No: 957840 EXPLOR G
                 Fax No: 0732 742977

                 or to such other address or telex number as such party may
                 from time to time notify to the other party hereto





                                     - 7 -
<PAGE>   8
11.      Costs

All costs and expenses (including legal fees) incurred in connection with the
negotiation, preparation and execution of this Agreement and in the completion
of the transactions contemplated hereby shall be for the account of the party
incurring the same.

12.      Severability

If any provision hereof shall be held to be void, illegal or unenforceable it
shall be deemed severable from the remaining provisions hereof which shall
remain in full force and effect.

13.      Assignments

This Agreement shall be binding upon and shall enure to the benefit of each of
the parties hereto and their respective successors and assigns.

14.      Counterparts

This Agreement may be executed in any number of counterparts and all such
counterparts taken together shall be deemed to constitute one and the same
instrument.

15.      Further Assurance

Each party will promptly execute and deliver all further instruments and
documents, and take all further action, as may be necessary or appropriate to
implement the terms of this Agreement.

16.      Law and Jurisdiction

This Agreement shall be governed by and construed in accordance with English
law and any dispute or difference shall be referred to the exclusive
Jurisdiction of the English Courts.

IN WITNESS whereof this Agreement has been executed by the parties hereto the
day and year first above written.



THE ASSIGNOR

SIMON HORIZON LIMITED


By:  /s/ [illegible signature]





                                     - 8 -
<PAGE>   9
THE ASSIGNEE

HORIZON EXPLORATION LIMITED



By: /s/ G.M. Harrison





                                     - 9 -

<PAGE>   1

                                                                          10.9.5

DATED                                 July                                  1994
- --------------------------------------------------------------------------------




(1) HORIZON EXPLORATION LIMITED





(2) SIMON-HORIZON LIMITED




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                     D E E D    O F    A S S I G N M E N T

                                       of
                                   Insurances

                 Relating to Goods used in connection with the
                             M.V. "SIMON LABRADOR"

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SIMMONS & SIMMONS
14 Dominion Street
London ECZM 2RJ
<PAGE>   2
T H I S   D E E D   O F   A S S I G N M E N T   is made the 15th day of July,
1994

BETWEEN:

(1)      HORIZON EXPLORATION LIMITED, a company incorporated in England and
         Wales with registration number 2804983 (the "Assignor"); and

(2)      SIMON-HORIZON LIMITED, a company incorporated in England and Wales
         with registration number 467924 (the "Assignee")

WHEREAS:

(A)      The Assignor has by a charterparty (the "Charter") by way of
         sub-demise dated the date hereof agreed to sub-charter the m.v. Simon
         Labrador (the "Vessel") from the Assignee and by a Master Lease
         Agreement and two Lease Contracts (together, the "Leases") all of even
         date herewith has further agreed to sub-lease certain equipment from
         the Assignee to be used in connection with the Vessel.

(B)      It is a condition precedent to the obligations of the Assignee to
         deliver to the Assignor the Vessel and the Goods pursuant to the terms
         of the Charter and the Leases respectively that (inter alia) the
         Assignor execute this Assignment and thereby secure all of its
         obligations to the Assignee under or pursuant to the Charter and the
         Leases

NOW THIS ASSIGNMENT WITNESSES:

1.       Interpretation

(A)      Terms used herein and in the recitals hereto and not otherwise defined
         shall have the meanings given to them in the Charter and/or the
         Leases.

(B)      In this Assignment:

         (a)     "Approved Brokers" means such insurance brokers as the
                 assignee may have approved in writing;

         (b)     "Insurers" means the underwriters or insurance companies with
                 whom any of the Insurances are effected and (to the extent, if
                 any, applicable) the managers of any protection and indemnity
                 or war risks association in which the Vessel may at any time
                 be entered if cover in respect of the Goods is provided
                 thereby;

         (c)     "Insurances" means all policies and contracts of insurance and
                 (to the extent, if any, applicable) all entries in a
                 protection and indemnity or war risks





                                       2
<PAGE>   3
                 association which are now or may hereafter be taken out or
                 effected in respect of the Goods, earnings or profits
                 therefrom or otherwise howsoever and all the benefits thereof,
                 including all claims whatsoever and returns of premiums;

         (d)     any reference to a total loss shall be read to include a
                 reference to an actual total or constructive total or an
                 agreed, arranged or compromised total loss.

2.       Representations

The Assignor represents that:

(A)      it has power to enter into and perform this Assignment and has taken
         all necessary corporate or other action required to authorise the
         execution and delivery of this Assignment and its performance
         according to its terms;

(B)      it is not necessary to ensure the legality, validity, enforceability
         or admissibility in evidence of this Assignment (i) that it be filed,
         except for registration with the registrar of Companies in England and
         Vales, in the United Kingdom or in any country where the Assignor
         carries on business or (ii) that it be stamped with any stamp or
         similar transaction tax in any such country;

(C)      all consents, licenses, approvals or authorisations of or declarations
         to or registrations with governmental authorities or agencies or
         courts required to make this Assignment legal, valid, enforceable or
         admissible in evidence and to enable it lawfully to enter into and
         perform its obligations hereunder have been obtained or made and are
         in full force and effect;

(D)      the execution and delivery of this Assignment and its performance
         according to its terms will not violate (i) the Memorandum and
         Articles of Association of the Assignor, (ii) any applicable law or
         regulation or order or decree of any governmental authority or agency,
         or (iii) any mortgage, deed or agreement which is binding upon the
         Assignor or any of its assets; and

(E)      it has not heretofore assigned, charged or pledged all or any part of
         the Insurances.

3.       Title to Insurances

The Assignor:

(A)      as beneficial owner assigns all its right, title and interest in and
         to the Insurances to the Assignee provided that on discharge by the
         Assignor of all of its obligations under the





                                       3
<PAGE>   4
         Charter and Leases, provided the Assignor is under no further actual
         or contingent liability under the Agreement or any other of the HEL
         Documents (as such phrase is defined in and for the purposes of the
         Agreement), the Assignee will at the request and cost of the Assignor
         without recourse or warranty as to the subject-matter of such
         assignment re-assign the Insurances to the Assignor or whomsoever may
         be entitled thereto;

(B)      shall forthwith on the execution hereof give notice of the aforesaid
         assignment to the Insurers (or will procure that the Approved Brokers
         do so) substantially in the following form:

                              NOTICE OF ASSIGNMENT

SIMON-HORIZON LIMITED (the "Assignee") and HORIZON EXPLORATION LIMITED (the
"Assignor") HEREBY GIVE NOTICE that by a first assignment dated 15th July 1994
the Assignor assigned to the Assignee all of its right, title and interest in
and to the benefit of all insurances now or hereafter taken out in respect of
the [Goods] the subject of the insurances [constituted by the policy]
[evidenced by the certificate of entry] whereon this notice is endorsed.

Dated [  ] [July] 1994


For and on behalf of                       For and on behalf of
The Assignor                                       The Assignee





(C)      shall forthwith upon the coming into effect of any of the Insurances
         after the date hereof, give (or procure that the Approved Brokers, if
         any, give) to the Insurers notice of the aforesaid assignment in the
         form specified in sub-clause (B) of this Clause;

(D)      shall execute all such documents and do all such things as may be
         necessary to create in the Assignee a legal title to each of the
         Insurances and will, in particular but without limitation, (i) notify
         the Approved Brokers and the Insurers of the interest of the Assignee
         in each of the Insurances, and (ii) secure that each of the Insurances
         contains a Loss Payable and Notice of Cancellation Clause
         substantially in the following form (or otherwise as may reasonably be
         agreed between the Owner, the Assignee and the Assignor):





                                       4
<PAGE>   5
                          "LOSS PAYABLE AND NOTICE OF
                              CANCELLATION CLAUSE

By an assignment dated [ ] July, 1994 the Assignor has assigned to
Simon-Horizon Limited (the "Assignee") this policy and all benefits thereof
including all claims of whatsoever nature thereunder.

(A)      Until the Assignee notifies the underwriters to the contrary:

         -       all claims hereunder whatsoever shall be paid to the Assignee
                 without any deduction or deductions whatsoever unless the
                 Assignee has given prior written instructions to the contrary.

(B)      The Assignee shall be advised:

         (1)     immediately of any material changes which are proposed to be
                 made in the terms of the insurances or if the underwriters
                 cease to be underwriters for any purposes connected with the
                 insurances;

         (2)     not later than fourteen days prior to the expiry of any of the
                 insurances if instructions have not been received for the
                 renewal or further renewal thereof and, in the event of
                 instructions being received to renew or further to renew, of
                 the details thereof;

         (3)     immediately of any instructions or notices received by
                 underwriters with regard to the cancellation or invalidity of
                 any of the insurances aforesaid."

(E)      shall cause the Insurers (or, in the case of any of the Insurances
         which are effected through Approved Brokers, the Approved Brokers) and
         (to the extent, if any, applicable) the managers of any relevant
         protection and indemnity or war risks association (i) to hold to the
         order of the Assignee the originals of all policies, contracts,
         binders, insurance slips, cover notes and, where applicable,
         certificates of entry relating to the Goods and the benefits thereof
         and to deliver certified copies thereof to the Assignee on request,
         and (ii) to agree to advise the Assignee promptly:

                 (a)      if any underwriter, insurance company or protection
                          and indemnity or war risks association cancels any of
                          the Insurances;

                 (b)      of any alteration to any of the Insurances or any
                          default in the payment of any premium, call or
                          contribution or any failure to renew any of the
                          Insurances at least fourteen days before its expiry;
                          and





                                       5
<PAGE>   6
                 (c)      of any other act, omission or event of which they
                          have knowledge which would or might render invalid or
                          unenforceable any of the Insurances in whole or in
                          part;

(F)      shall not hereafter assign, charge or pledge its right, title and
         interest in and to the Insurances in whole or in part without the
         Assignee's prior written consent;

(G)      shall not without the prior written consent of the Assignee settle,
         compromise or abandon any claim under any of the Insurances.

4.       Application of Insurance Moneys

All monies payable under, pursuant to or in respect of the insurances shall be
applied as provided pursuant to Clause 11 of the Master Lease.

5.       Law

This Assignment shall be governed by and construed in accordance with the laws
of England.

IN WITNESS whereof the Assignor has caused this Deed to be executed as its Deed
the day and year first before written.

SIGNED by                                  )
and by                                     )       /s/ Neil A.M. Campbell
and thereby executed by                    )       /s/ G.M. Harrison
HORIZON EXPLORATION LIMITED                )
as its Deed                                )



SIGNED by                                  )
for and on behalf of                       )       /s/ [illegible signature]
SIMON-HORIZON LIMITED                      )
in the presence of:                        )





                                       6

<PAGE>   1
                                                                          10.9.6


DATED                           15th July, 1994                             1994





                              HORIZON SEISMIC INC.

                                      and

                          EXPLORATION HOLDINGS LIMITED

                                      and

                          HORIZON EXPLORATION LIMITED



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                        DEED OF CONTINUING INTER-COMPANY
                        CROSS GUARANTEE AND INDEMNITY

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                                  in favour of

                             SIMON-HORIZON LIMITED

                       SIMON PETROLEUM TECHNOLOGY LIMITED

                                      and

                             SIMON ENGINEERING PLC



SIMMONS & SIMMONS
14 DOMINION STREET
LONDON EC2M 2RJ
(Ref: 5A/P.37800/AZM/2566m)





<PAGE>   2


T H I S   D E E D is made the 15th day of July, 1994

- -------------------------------

BETWEEN:

(1)      THE COMPANIES whose names, registration numbers and registered offices
         are specified in the Schedule hereto (the "Companies") of the one
         part; and

(2)      SIMON-HORIZON LIMITED, registration number 467924, a company
         incorporated in England and Wales with registered office at Horizon
         House, Azalea Drive, Swanley, Kent, BR8 8JR SIMON PETROLEUM TECHNOLOGY
         LIMITED registration number 2720413, a company incorporated in England
         and Wales with registered office at Ty'n-y-Coed, Llanrhos, Llandudno,
         North Wales; and SIMON ENGINEERING PLC registration number 52665, a
         company incorporated in England and Wales with registered office at
         Simon House, Bird Hall Lane, Stockport, Cheshire SK3 ORJ (hereinafter
         together called the "Beneficiaries" and each a "Beneficiary" which
         expression shall include their respective successors and assigns) of
         the other part.

WHEREAS:

(A)      By an Agreement of even date herewith (the "Agreement") made between
         the Beneficiaries and Horizon Exploration Limited ("HEL") HEL is to
         enter into the Charterparty by way of sub-demise referred to in
         Recital (B) below with Simon-Horizon Limited ("Simon") and certain
         other arrangements with the Beneficiaries in relation to the m.v.
         "SIMON LABRADOR" registered under the Bahamian flag at the port of
         Nassau under Official Number 715224 (the "Ship") upon the terms and
         conditions therein mentioned.

(B)      By a Charterparty by way of Sub-Demise (the "Charterparty") of even
         date herewith and made between Simon (1) and HEL (2) Simon has agreed
         to let and DEL has agreed to take the Ship on demise charter upon the
         terms and conditions therein mentioned.

(C)      By the Agreement HEL has agreed with the Beneficiaries (inter alia) to
         procure that certain works be carried out to the Ship and equipment be
         installed thereon at the expense of HEL upon the terms and conditions
         therein mentioned.

(D)      The execution and delivery of this Deed of Inter-Company
         Cross-Guarantee and Indemnity by the Companies is one of the
         conditions precedent (inter alia) to Simon letting and demising the
         Ship to HEL pursuant to the Charterparty.





                                     - 2 -
<PAGE>   3
IT IS AGREED as follows:

1.       INTERPRETATION

1.1      In this Deed of Continuing Inter-Company Cross Guarantee and
         Indemnity, unless the context otherwise requires or unless otherwise
         defined herein, words and expressions defined in the Charterparty and
         used herein shall have the same meaning where used in this Deed.

1.2      In this Deed, unless the context otherwise requires:

         "Deed" means this Deed of Continuing Inter-Company Cross Guarantee and
         Indemnity;

         "Guarantee" includes each separate or independent stipulation or
         agreement by the Companies and each one of them contained in this
         Deed;

         "Guaranteed Indebtedness" means the Indebtedness of HEL to the
         Beneficiaries guaranteed pursuant to Clause 2.1 and indemnified
         pursuant to Clause 2.2;

         "Guaranteed Liabilities" means the Liabilities of HEL to the
         Beneficiaries, the discharge of which is guaranteed pursuant to Clause
         2.1 and indemnified pursuant to Clause 2.2;

         "Guarantors" means the Companies and each of them;

         "Incapacity" means in relation to a person the death, bankruptcy,
         unsoundness of mind, insolvency, liquidation, dissolution, winding-up,
         administration, receivership, amalgamation, reconstruction or other
         incapacity of that person whatsoever (and, in the case of a
         partnership, includes the termination or change in the composition of
         the partnership);

         "Indebtedness" means any obligation for the payment or repayment of
         money, whether as principal or as surety and whether present or
         future, actual or contingent;

         "Liabilities" means all obligations and liabilities whatsoever,
         whether express or implied, whether as principal or surety, whether
         present or future, actual or contingent, whether joint or several in
         whatever style, name or form and in whatever currency denominated.

1.3      Clause headings are inserted for convenience of reference only and
         shall be ignored in the interpretation of this Deed.

1.4      In this Deed, unless the context otherwise requires:

         (a)     references to Clauses are to be construed as references to the
                 clauses of this Deed;





                                     - 3 -
<PAGE>   4
         (b)     references to (or to any specifies provision of) this Deed or
                 any other document shall be construed as references to this
                 Deed, that provision or that document as in force for the time
                 being and as amended in accordance with the terms thereof, or,
                 as the case may be, with the agreement of the relevant parties
                 and (where such consent is, by the terms of this Deed or the
                 relevant document, required to be obtained as a condition to
                 such amendment being permitted) the prior written consent of
                 the Beneficiaries or any of them;

         (c)     words importing the plural shall include the singular and vice
                 versa;

         (d)     references to a person shall be construed as references to an
                 individual, firm, company, corporation, unincorporated body of
                 persons or any Government Entity; and

         (e)     references to statutory provisions shall be construed as
                 references to those provisions as replaced, amended or
                 reenacted from time to time.

2.       GUARANTEE

In consideration of Simon chartering the Ship to HEL pursuant to the
Charterparty and of each of the Beneficiaries entering into the Agreement and
of other good and valuable consideration (the adequacy whereof is hereby
acknowledged by the Guarantors and each of them) the Guarantors jointly and
severally agree:

2.1      As a primary obligation and not merely as a surety, they hereby
         guarantee:

         (a)     the full, due and punctual performance of all obligations of
                 HEL to the Beneficiaries howsoever arising, including, without
                 limitation, procuring the fulfillment of all the works and
                 supply of equipment to the Ship as contemplated by the
                 Agreement; and

         (b)     payment when due of all moneys due on any account whatsoever
                 by HEL to the Beneficiaries or to any of them, howsoever
                 arising, together with all other Indebtedness or Liabilities
                 whatsoever of HEL to the Beneficiaries or to any of them,
                 howsoever arising, whether under the Agreement the
                 Charterparty, any of the Relevant Documents or otherwise

         so that in case of either (a) or (b), if HEL shall default, each of
         the Guarantors shall itself be liable fully to perform the same or
         make the relevant payment.

2.2      Unconditionally and irrevocably as a primary obligation to indemnify
         the Beneficiaries on a full and unqualified indemnity basis and hold
         the Beneficiaries harmless against any breach, default or failure by
         HEL duly and punctually to perform and observe the terms,





                                     - 4 -
<PAGE>   5
         conditions, covenants or obligations on its part contained in the
         Charterparty, the Agreement or any of the other Relevant Documents.

2.3      The Guarantee and the rights of the Beneficiaries under it shall not
         be affected or prejudiced by the Beneficiaries or any of them holding
         or taking any other or further securities or guarantees or by any
         Beneficiary varying, releasing, exchanging, enforcing or omitting or
         neglecting to enforce any such securities or guarantees (including
         this Guarantee in whole or in part and against one Guarantor or more
         than one Guarantor or by the introduction of any new Guarantor) or by
         the Beneficiaries giving time for payment or granting any other
         indulgence to or making any other arrangements with or accepting any
         composition from the Guarantors or any of them or any person liable on
         any securities or guarantees or indemnities held or to be held by the
         Beneficiaries or by any other act or thing (including the invalidity
         or unenforceability of any guarantee herein contained) which (apart
         from this provision) would or might afford an equitable defense to a
         surety.  Each of the Guarantors agrees that the Beneficiaries shall
         have no duty to any of the Guarantors in the enforcement or
         realization of any such security, suretyship or indemnity and, in
         particular, but without prejudice to the foregoing, the Beneficiaries
         shall owe no duty to any of the Guarantors in the conduct of any
         enforcement of any security over any of the assets of HEL or any other
         Guarantor or any co-surety and each of the Guarantors' liability
         hereunder shall not be reduced by the sale of any such assets at an
         undervalue.

2.4      The Beneficiaries shall be at liberty but not bound to resort for
         their own benefit to any other means of payment at any time and in any
         order they think fit without thereby diminishing the liability of any
         of the Guarantors and the Beneficiaries may enforce any of the
         guarantees herein contained either for the payment of the ultimate
         balance after resorting to other means of payment (including any other
         of such guarantees) or for the balance due at any time notwithstanding
         that any such other means of payment have not been resorted to and in
         each case without entitling any of the Guarantors to any benefit from
         such other means of payment so long as any Guaranteed Indebtedness or
         Guaranteed Liabilities remain due or owing or payable or undischarged.

2.5      The bankruptcy, winding-up, liquidation, dissolution administration,
         receivership or insolvency of any one or more of the Guarantors shall
         not affect or determine the liability of the other Guarantors or any
         of them under this Deed.  All dividends, compositions and moneys
         received by the Beneficiaries or any of them from any Guarantor
         subject to such Incapacity or from any other company, person or estate
         capable of being applied by the Beneficiaries in reduction of the
         indebtedness, liabilities or obligations of any of any such Guarantor
         shall be regarded for all purposes as payments in gross and the
         Beneficiaries shall be entitled to prove in the bankruptcy,
         winding-up, liquidation, dissolution, receivership or insolvency of
         any such Guarantor in respect of the whole of such Guarantor's
         obligations to the Beneficiaries and without any right on the part of
         any other Guarantor to be subrogated to the Beneficiaries or any of
         them in respect of any such proof to the intent that this Guarantee
         shall apply to and secure the whole of any ultimate





                                     - 5 -
<PAGE>   6
         balance which shall remain due to the Beneficiaries or any of them
         from each of the Guarantors.

2.6      Any settlement or discharge between the Beneficiaries and any of the
         Guarantors shall be subject to the condition that no security or
         payment to the Beneficiaries by any of the Guarantors or any other
         person shall be avoided, invalidated, reduced, repaid or surrendered
         by virtue of any provisions or enactments relating to bankruptcy,
         winding-up, liquidation, dissolution, administration, receivership or
         insolvency for the time being in force and if any such security or
         payment shall be so avoided or reduced the Beneficiaries shall be
         entitled to recover the value or amount thereof from such Guarantor
         subsequently just as if such settlement or discharge had not occurred.

2.7      The Guarantee shall take effect as a guarantee of the whole and every
         part of the Guaranteed Indebtedness and the Guaranteed Liabilities and
         none of the Guarantors shall be entitled as against the Beneficiaries
         to any right of proof in the bankruptcy, winding-up, liquidation,
         dissolution or insolvency of any other Guarantor or any other surety
         or other right of a surety (including any right of contribution from
         any other surety) discharging, in whole or in part, his liability in
         respect of the principal debt or to share in any security, suretyship
         or indemnity held or money received by any Beneficiary on account of
         the obligations of such Guarantor or any other surety or to have or
         exercise any rights as surety (including any such right of
         contribution as aforesaid) in competition with the Beneficiaries
         unless and until the whole of the Guaranteed Indebtedness and the
         Guaranteed Liabilities shall have first been completely discharged and
         satisfied nor until the Guaranteed Indebtedness and Guaranteed
         Liabilities shall have been discharged and satisfied in full shall any
         of the Guarantors take any step to enforce any right or claim against
         any other Guarantor in respect of any moneys paid by such first
         Guarantor to the Beneficiaries hereunder or to exercise any other
         rights, claims or remedies of any kind which may accrue howsoever to
         any of the Guarantors in respect either of the amount so payable or so
         paid (including any such right of contribution as aforesaid) or of any
         other moneys for the time being due or owing to any of the Guarantors
         from any other Guarantor or any other surety or otherwise, provided
         that in the event of the bankruptcy, winding-up, liquidation,
         dissolution or insolvency of any of the Guarantors or any other surety
         each other Guarantor shall, if so directed by the Beneficiaries, but
         not otherwise, prove for (to the fullest extent permitted by law) the
         whole or any part of the moneys due or owing to it from such other
         Guarantor or any other surety as aforesaid on terms that the benefit
         of such proof and of all moneys received by it in respect thereof
         shall be held on trust for the Beneficiaries.  Furthermore, for the
         purpose of enabling the Beneficiaries to sue any of the Guarantors or
         any other surety or prove in the bankruptcy, winding-up, liquidation,
         dissolution or insolvency of any of the Guarantors (the First
         Guarantors) or any other surety in relation to or in respect of the
         whole of the Guaranteed Indebtedness and the Guaranteed Liabilities,
         or to preserve intact the liability of any other party, the
         Beneficiaries may at any time place and keep, for such time as it may
         think prudent, any moneys received, recovered or realized on account
         of the obligations of the First Guarantor whether from any other
         Guarantor hereunder or under any other guarantee or





                                     - 6 -
<PAGE>   7
         security to the credit either of such other Guarantor or of such other
         person or transaction (if any) as the Beneficiaries may think fit,
         without any intermediate obligation on the part of the Beneficiaries
         to apply the same or any part thereof in or towards the discharge of
         the Guaranteed Indebtedness and the Guaranteed Liabilities, or any
         intermediate right on the part of such other Guarantor to sue the
         First Guarantor or any other surety or prove in the bankruptcy,
         winding-up, liquidation, dissolution or insolvency of the First
         Guarantor or any other surety in competition filth or so as to
         diminish any dividend or other advantage that would or might come to
         the Beneficiaries or to treat the liability of the First Guarantor as
         diminished provided that any such moneys shall be held in an interest
         bearing account with whichever bank the Beneficiary shall designate.
         As used in this Clause 2.7 and Clause 2.11 hereof the expression "any
         other surety" includes, without prejudice to the generality of such
         term, any other person constituting any of the Guarantors and any
         party to any security, suretyship or indemnity or other person
         referred to in Clause 2.3.

2.8      For all purposes, including any legal proceedings, a certificate
         signed by any of the officers of any Beneficiary as to the sums,
         obligations and liabilities for the time being due or incurred to it
         by HEL and/or any other of the Guarantors shall be prima facie
         evidence thereof against each Guarantor.

2.9      As a separate and independent stipulation each of the Guarantors
         agrees, both severally and also jointly with every other Guarantor,
         that any Indebtedness, Liability or obligation incurred or purported
         to be incurred by any of the Guarantors or by any person purporting to
         act on behalf of any of the Guarantors which may not be recoverable
         from or enforceable against such Guarantor by reason of any legal
         limitation, disability or incapacity on or of such Guarantor or any
         other fact or circumstance and whether known to the Beneficiaries or
         any of them or to any of the Guarantors or not, shall nevertheless be
         recoverable from the other Guarantors as though the same had been
         incurred or undertaken by the other Guarantors and the other
         Guarantors were jointly and severally liable as sole or principal
         debtors in respect thereof and shall be paid by the other Guarantors
         on demand.

2.10     This Deed shall continue to bind the Guarantors and continue to apply
         to future or subsequent Indebtedness, Liabilities and other
         obligations incurred or undertaken or to be incurred or undertaken by
         any of HEL and the other Guarantors to or in favour of the
         Beneficiaries or any of them notwithstanding any amalgamation or
         merger that may be effected by the Beneficiaries or any of them with
         any other company and notwithstanding any reconstruction by any
         Beneficiary involving the formation of and transfer of the whole or
         any of its undertaking and assets to a new company and notwithstanding
         the sale or transfer of all or any part of its undertaking to another
         company whether the company with which the Beneficiary amalgamates or
         merges or the company to which it transfers all or any part of its
         undertaking and assets either on a reconstruction or sale or transfer
         as aforesaid shall or shall not differ from such Beneficiary in its
         objects, character or constitution and notwithstanding any transfer or
         assignment of the benefit of the





                                     - 7 -
<PAGE>   8
         provisions herein contained and any rights conferred on the
         Beneficiaries hereby to any other person, it being the intent of each
         of the Guarantors that the Guarantee shall remain valid and effectual
         in all respects in favour of, against and with reference to, and that
         the benefit thereof and all rights conferred upon the Beneficiaries
         hereby may be assigned to and enforced by, any such company or other
         person and proceeded on in the same manner to all intents and purposes
         as if such company or other person had been named herein instead of or
         in addition to the Beneficiaries and the Beneficiaries shall be at
         liberty (subject to the provisions of Clause 6, but otherwise without
         liability to any of the Guarantors) to disclose any information
         regarding the financial affairs of any of the Guarantors to any
         transferee or assignee or proposed transferee or assignee or other
         person entering into or proposing to enter into contractual
         arrangements with the Beneficiaries in relation to this Deed and/or
         the liabilities or obligations of any of the Guarantors to the
         Beneficiaries.

2.11     While any amount from time to time remains payable under this Deed any
         right of any of the Guarantors, arising whether by way of subrogation
         or otherwise out of or in connection with the performance of any of
         its duties and obligations, whether express or implied, under this
         Deed, to be indemnified by HEL or any other Guarantor or to proceed
         on, take the benefit of or enforce any other mortgage, security,
         guarantee, indemnity or other right shall only be exercised or
         enforced by such Guarantor with the previous written consent of the
         Beneficiaries and subject to such terms and conditions as such consent
         may specify.  Any proceeds of or amounts received or recovered
         pursuant to or in connection with any such exercise or enforcement
         shall in any event and without prejudice to the provisions of Clause
         2.7 hereof be paid and transferred immediately to the Beneficiaries or
         as the Beneficiaries may otherwise direct and pending such payment and
         transfer shall be held in trust absolutely for the benefit of the
         Beneficiaries.  Each of the Guarantors declares that it has not
         received any mortgage, pledge, charge or other security from any of
         HEL and the other Guarantors or any other surety for the giving of the
         guarantee on its part herein contained and each of the Guarantors
         agrees that it will not, so long as such guarantee remains in force,
         take any mortgage, pledge, charge or other security in respect of its
         liability hereunder or exercise any right of lien or set-off against
         any of HEL and the other Guarantors or any other surety without first
         obtaining the written consent of the Beneficiaries.

2.12     No assurance, security, guarantee or payment which may be avoided
         under any law relating to bankruptcy, insolvency, administration or
         winding-up (including without limitation sections 238, 239, 242, 243,
         or 245 of the Insolvency Act 1986), and no release, settlement,
         discharge or arrangement given or made by the Beneficiaries on the
         faith of any such assurance, security, guarantee or payment, shall
         prejudice or affect the right of the Beneficiaries to enforce this
         security to the full extent of the indebtedness, liabilities and
         obligations referred to in Clause 2 hereof.  The Beneficiaries may in
         their absolute discretion retain the security so created for a period
         of one month plus such statutory period within which any assurance,
         security, guarantee or payment can be avoided or invalidated after all
         financial accommodation from time to time made available





                                     - 8 -
<PAGE>   9
         to any Guarantor by the Beneficiaries shall have ceased to be
         available or (if longer) all such liabilities and obligations shall
         have been paid and discharged in full, notwithstanding any release,
         settlement, discharge or arrangement given or made by the
         Beneficiaries on, or as a consequence of, such cessation or, as the
         case may be, payment.  If at any time within such period a petition
         shall be presented to a competent court for an order for the
         bankruptcy, insolvency or winding-up of any of the Guarantors or any
         of the Guarantors shall commence to be wound up voluntarily, or an
         application for an administration order shall be made to a competent
         court in respect of that Guarantor the Beneficiaries may,
         notwithstanding as aforementioned, continue to retain the security or
         any part thereof for and during such further period as the
         Beneficiaries in their absolute discretion shall determine.  Each
         Guarantor agrees that such security shall be deemed to have been and
         to have remained held by the Beneficiaries as and by way of security.
         In the event that any Beneficiary shall be required under section 234
         of the Insolvency Act 1986 to pay any sum to an office-holder (as
         defined in the said section) of any of the Guarantors, then such sum
         when paid by the Beneficiary shall be deemed to form part of the
         liabilities hereby secured and any release, settlement, discharge or
         arrangement given or made by the Beneficiary on the faith of any
         payment on account of such liabilities which the Beneficiary shall be
         so required to pay to the said office-holder shall be treated as
         having been given or made by the Beneficiary, and accepted by such
         Guarantor, upon the express condition that the same shall be subject
         and without prejudice to the Beneficiary's right to recover the same
         under this Deed.

3.       PAYMENTS

3.1      The obligations of each of the Guarantors hereunder shall be to make
         payment to the Beneficiaries in the currency in which the applicable
         obligation ought to have been or ought to be discharged by the party
         concerned, strictly in accordance with the terms and provisions of the
         relevant agreement, express or implied, between the relevant
         Beneficiary or Beneficiaries and such party applicable to each
         respective obligation of such party, regardless of any law, regulation
         or decree, now or hereafter in effect, which affects or might in any
         manner affect any of such terms or provisions or the rights of the
         Beneficiaries as against such party.

3.2      Each payment to be made by any of the Guarantors hereunder shall be
         made to the Beneficiaries, in the appropriate currency in accordance
         with the terms hereof, to the credit of the relevant Beneficiary's
         account with whichever bank or banks located in the country of such
         currency as shall be designated by such Beneficiary.  All such
         payments shall be made without set-off or counterclaim and free and
         clear of and without deduction or withholding for any tax of any
         nature now or hereafter imposed by any country or any sub-division or
         taxing authority thereof or therein or any federation or organization
         of which such country is a member.  If any such payment shall be
         subject to any such tax or if any of the Guarantors shall be required
         to make any such seduction or withholding, such Guarantor shall pay to
         the relevant Beneficiary such additional amount as may be necessary to
         enable the Beneficiary to receive and retain, after all deductions and





                                     - 9 -
<PAGE>   10
         withholdings, a net amount equal to the full amount payable hereunder.
         As used in this Clause the term "tax" includes all levies, imposts,
         duties, charges, fees, deductions, withholdings, turnover tax,
         transaction tax, stamp tax, stamp duty and any restrictions or
         conditions of any nature resulting in a charge.

3.3      It is further agreed by each of the Guarantors, both severally and
         also jointly with every other Guarantor, that the Guarantors will
         indemnify each Beneficiary against any loss incurred as a result of
         any judgment or order being given or made for the payment of any
         amount due hereunder and such judgment or order being expressed in a
         currency other than that in which such amount is payable by the
         Guarantors hereunder and as a result of any variation having occurred
         in rates of exchange between the date as at which such amount is
         converted into such other currency for the purposes of such judgment
         or order and the date of actual payment pursuant thereto.  The
         foregoing indemnity shall constitute a separate and independent
         obligation of the Guarantors and shall apply irrespective of any
         indulgence granted to any of the Guarantors from time to time and
         shall continue in full force and effect notwithstanding any such
         judgment or order as aforesaid.

4.       REPRESENTATIONS AND WARRANTIES

4.1      The Guarantors jointly and severally represent and warrant to the
         Beneficiaries and to each of them that:

         (a)     each Guarantor is duly incorporated and validly existing in
                 good standing under the laws of England or the State of Texas
                 as the case may be, as limited company and has power to carry
                 on its businesses as now being conducted and to own its
                 property and other assets;

         (b)     each Guarantor has power to execute, deliver and perform its
                 obligations under this Deed, and all necessary corporate,
                 shareholder and other action has been taken to authorize its
                 execution, delivery and performance of the same and no
                 limitation on the power of any Guarantor to borrow or give
                 guarantees will be exceeded as a result of this Deed;

         (c)     this Guarantee constitutes valid, binding and enforceable
                 obligations of each Guarantor;

         (d)     the execution and delivery of this Deed, the performance of
                 its obligations hereunder, and compliance with the provisions
                 of this Deed by each of the Guarantors will not (i) contravene
                 any existing applicable law, statute, rule or regulation or
                 any judgment, decree or permit to which such Guarantor is
                 subject, or (ii) contravene or conflict with any provision of
                 any Guarantor's respective Memorandum and Articles of
                 Association, By-Laws, Statutes or other constitutional
                 documents;





                                     - 10 -
<PAGE>   11
         (e)     it is not necessary to ensure the legality, validity,
                 enforceability or admissibility in evidence of this Deed that
                 it or any other instrument be notarized, filed, recorded,
                 registered or enrolled in any court, public office or
                 elsewhere in England or in any other Jurisdiction or that any
                 stamp, registration or similar tax or charge be paid in
                 England or in any other Jurisdiction on or in relation to this
                 Deed and this Deed is in proper form for its enforcement in
                 the courts of England, the State of Texas and the Federal
                 Courts of the United States of America;

         (f)     neither is any Guarantor or any of its assets entitled to
                 immunity on the grounds of sovereignty or otherwise from any
                 legal action or proceeding (which shall include, without
                 limitation, suit, attachment prior to judgment, execution or
                 other enforcement).

4.2      Each Guarantor further represents and warrants that:

         (a)     every consent, authorization, license or approval of, or
                 registration with or declaration to, governmental or public
                 bodies or authorities or courts required by the Guarantor to
                 authorize, or required by the Guarantor in connection with,
                 the execution, delivery, validity, enforceability or
                 admissibility in evidence of this Deed or the performance by
                 the Guarantor of its obligations under this Deed has been
                 obtained or made and is in full force and effect and there has
                 been no default in the observance of the conditions or
                 restrictions (if any) imposed in, or in connection with, any
                 of the same;

         (b)     the obligations of the Guarantor under this Deed are direct,
                 general and unconditional obligations of the Guarantor and
                 rank at least pari passu with all other present and future
                 unsecured and unsubordinated Indebtedness of the Guarantor
                 with the exception of any obligations which are mandatorily
                 preferred by law and not by contract;

         (c)     as at the date of this Deed, Exploration Holdings Limited is
                 the holding company (and "holding company" shall have the
                 meaning ascribed thereto pursuant to section 736 of the
                 Companies Act 1985) and is, directly or indirectly, the
                 beneficial owner of all of the issued share capital of HEL;

         (d)     no Relevant Event has occurred and is continuing; and

         (e)     save as disclosed, no action, suit, proceeding, litigation or
                 dispute against the Guarantor is taking place or pending or to
                 the Guarantors's knowledge threatened before any court, board
                 of arbitration or other body nor is there subsisting any
                 judgment or award given against the Guarantor which in each
                 case would or might result in any material adverse change in
                 the business or condition (financial or otherwise) of the
                 Guarantor.





                                     - 11 -
<PAGE>   12
4.3      The representations and warranties in Clauses 4.1 and 4.2 shall be
         deemed to be repeated by the Guarantors on and as of each day from the
         date of this Deed until all the Guaranteed Indebtedness and Guaranteed
         Liabilities shall have been fully and finally paid and discharged
         whether by HEL and/or by the Guarantors or any of them pursuant to
         this Deed as if made with reference to the facts and circumstances
         existing on each such day.

5.       UNDERTAKINGS

5.1      Each of the Guarantors undertakes that as from the date of this Deed
         until all the Guaranteed Indebtedness and Guaranteed Liabilities shall
         have been fully and finally paid and discharged, it will:

         (a)     promptly inform the Beneficiaries of any occurrence of which
                 it becomes aware which might adversely affect its ability to
                 perform its obligations under this Deed forthwith upon
                 becoming aware thereof;

         (b)     without prejudice to Clause 4.2, obtain or cause to be
                 obtained, maintain in full force and effect and comply in all
                 material respects with the conditions and restrictions (if
                 any) imposed in or in connection with, every consent,
                 authorization, license or approval of governmental or public
                 bodies or authorities or courts and do, or cause to be done,
                 all other acts and things which may from time to time be
                 necessary or desirable under applicable law for the continued
                 due performance of all its obligations under this Deed; and

         (c)     prepare financial statements in accordance with generally
                 accepted accounting principles and practices in England or the
                 United States, as appropriate, consistently applied in respect
                 of each financial year and cause the same to be reported on by
                 its auditors and deliver copies of the same to Simon as soon
                 as practicable but not later than 180 days after the end of
                 the financial period to which they relate.

5.2      Each Guarantor further undertakes with the Beneficiaries that it will:

         (a)     pay to the Beneficiaries on demand (whether any such
                 Indebtedness, Liabilities or obligations shall be its sole
                 Indebtedness, Liabilities or obligations or shall be joint
                 with any person, firm or company) all of its present and
                 future Indebtedness to the Beneficiaries on any account
                 whatsoever, all of its other Liabilities whatsoever to the
                 Beneficiaries, present or future, actual or contingent,
                 howsoever arising (including, but without prejudice to the
                 provisions of Clause 2 hereof, liabilities and obligations as
                 surety or guarantor whether pursuant to this Deed or
                 otherwise) and that it will fully and faithfully perform and
                 discharge all of its other obligations to the Beneficiaries,
                 howsoever arising; and





                                     - 12 -
<PAGE>   13
         (b)     it will (except in the case of HEL which shall itself so
                 perform and discharge all of such obligations) use its best
                 endeavors to procure that HEL shall fully and faithfully
                 perform and discharge all of its obligations to the
                 Beneficiaries pursuant to the Agreement and the Relevant
                 Documents.

6.       BENEFIT OF THIS DEED AND ASSIGNMENT

6.1      This Deed shall be binding upon the Guarantors and their respective
         successors in title and shall enure for the benefit of the
         Beneficiaries and their respective successors in title, assignees and
         transferees.

6.2      The Guarantors may not assign or transfer any of their respective
         rights or obligations under this Deed.  The Beneficiaries or any of
         them may at any time transfer all or any part of their or its rights,
         benefits and obligations under this Deed by assigning to any other of
         them or to any third party (each of which is hereinafter in this
         Clause called an "Assignee") which is not a Business Competitor of HEL
         (as such term is defined in and for the purposes of the Agreement) all
         or any part of its respective rights and benefits hereunder in
         consideration (except in the case of any assignment to Royal Bank of
         Scotland (Industrial Leasing) Limited or any other company within the
         Royal Bank of Scotland plc group of companies when no such
         consideration shall be required) of the agreement of each such
         Assignee to perform, or to reimburse the assignor for having
         performed, the assignor's obligations hereunder as so assigned to such
         Assignee.  If any such third party is a Business Competitor of HEL the
         Beneficiaries shall not, without the prior written consent of HEL
         (such consent not to be unreasonably withheld or delayed), so transfer
         all or any part of its respective rights, benefits and obligations.
         If any of the Beneficiaries does so transfer its rights, benefits and
         obligations in accordance with the provisions of this Clause 6, all
         references in this Deed to it shall thereafter be construed as a
         reference to the Assignee.

6.3      The Beneficiaries may not disclose to a potential assignee or any
         other person proposing to enter into contractual arrangements with any
         of them in relation to the HEL Documents (as such term is defined in
         and for the purposes of the Agreement) information about the HEL, the
         Guarantors, the m.v. "Simon Labrador" and the HEL Documents except
         with the prior written consent of HEL (such consent not to be
         unreasonably withheld or delayed).

7.       NOTICES

Any demand or notice by the Beneficiaries hereunder shall be in writing and may
be served on the Guarantor on whom the demand is to be made by leaving the
same, or sending it through the post or by telex or facsimile transmission
addresses to such Guarantor, at the address set out opposite its name in the
Schedule to this Deed or at the address last known to the Beneficiaries as the
registered or principal office or, as the case may be, place of business of
such Guarantor, and a demand or notice so served shall be effective
notwithstanding that it may later be returned





                                     - 13 -
<PAGE>   14
undelivered if left at such address, at the time it was so left or, if sent by
post, 48 hours after the time it was posted and in proving such service by post
it shall be sufficient to prove that the envelope containing the demand or
notice was properly addressed, stamped and posted.  Any such demand or notice
by telex or facsimile transmission shall be deemed to have been duly served at
the time when in the ordinary course of transmission it would have been
received.

8.       OTHER MATTERS

8.1      No delay or omission of the Beneficiary in exercising any right, power
         or privilege hereunder shall impair such right, power or privilege or
         be construed as a waiver of such right, power or privilege nor shall
         any single or partial exercise of any such right, power or privilege
         preclude any further exercise thereof or the exercise of any other
         right, power or privilege. The rights and remedies of the Beneficiary
         herein provided are cumulative and not exclusive of any rights or
         remedies provided by law.

8.3      The illegality, invalidity or unenforceability of any provision of
         this Deed under the law of any Jurisdiction shall not affect its
         legality, validity or enforceability under the law of any other
         jurisdiction or the legality, validity, or enforceability of any other
         provision of this Deed.

8.4      This Deed may be executed in one or more parts or counterparts and all
         such parts or counterparts shall be construed and read together as one
         Deed.

8.5      This Deed shall be governed by and construed in accordance with
         English law and each of the Guarantors hereby irrevocably agrees for
         the benefit of the Beneficiaries that the English Courts are to have
         jurisdiction to settle any suit, action or proceeding which may arise
         out of or in connection with this Deed and accordingly any suit,
         action or proceeding so arising (in this Clause referred to as
         "Proceedings") may be brought in such court.  Without prejudice to the
         foregoing, the parties hereto further irrevocably agree that any
         Proceedings may be brought in the Courts of such other jurisdiction or
         jurisdictions as the relevant Beneficiary may from time to time select
         and each of the Guarantors hereby waives absolutely any immunity to
         which it is or may be entitled in any Jurisdiction. Horizon Seismic
         Inc. hereby irrevocably appoints Exploration Holdings Limited at its
         address set out in the Schedule hereto as its agent for service of
         process in England.

IN WITNESS whereof each of the Companies has caused this Continuing
Inter-Company Cross Guarantee and Indemnity to be executed as its deed, and the
Companies and the Beneficiaries have (with the intention of giving full effect
to any provision of this Continuing Inter-Company Cross Guarantee and Indemnity
which may for any reason not be made fully effective and binding on each of the
Companies by its execution of this Continuing Inter-Company Cross Guarantee and
Indemnity as its deed) caused this Continuing Inter-Company Cross Guarantee and
Indemnity to be signed, on their respective behalves on the day and year first
before written.





                                     - 14 -
<PAGE>   15

SIGNED by                      )
and                            )       /s/ Neil A.M. Campbell
and thereby executed by        )       /s/ G.M. Harrison
HORIZON SEISMIC INC.           )
as its deed                    )
                            
                            
SIGNED by                      )
and                            )       /s/ Neil A.M. Campbell
and thereby executed by        )       /s/ G.M. Harrison
EXPLORATION HOLDINGS           )
LIMITED as its deed            )
                            
                            
SIGNED by                      )
and                            )       /s/ Neil A.M. Campbell
and thereby executed by        )       /s/ G.M. Harrison
HORIZON EXPLORATION            )
LIMITED as its deed            )
                            




                                     - 15 -
<PAGE>   16
                                  THE SCHEDULE




<TABLE>
<CAPTION>


                                                                    REG OFFICE/
                                                                    ADDRESS
COMPANY                           REG NO.                           FOR NOTICES
- -------                           -------                           -----------

<S>                               <C>                               <C>
Exploration                       2812999                           6 Pembroke Road
Holdings Limited                                                    Sevenoaks
                                                                    Kent TN13 1XR

                                                                    Attn: The Company Secretary
                                                                    Telex: 957840 EXPLOR G
                                                                    Fax: 0732 742977

Horizon Seismic Inc.                                                11200 Westheimer
                                                                    Suite 200
                                                                    Houston
                                                                    Texas 77042

                                                                    Attn: The Senior
                                                                              Vice-President
                                                                    Fax: (0101) 713 977 3408


Horizon Exploration               2804983                           6 Pembroke Road
Limited                                                             Sevenoaks
                                                                    Kent TN13 1XR

                                                                    Attn: The Company Secretary
                                                                    Telex: 957840 EXPLOR G
                                                                    Fax: 0732 742977
</TABLE>





                                     - 16 -

<PAGE>   1

                                                                  EXHIBIT 10.9.7

                     Dated                  15th July, 1994
                     --------------------------------------



                           (1) SIMON-HORIZON LIMITED




                        (2) HORIZON EXPLORATION LIMITED





                               SUB-LEASE CONTRACT
                                    Number 1





                               SIMMONS & SIMMONS
                               14 DOMINION STREET
                                LONDON EC2M 2RJ
                            REF: 5A/P37800/A2M 1024m
                           [Contract No: RS920/0022]
                            -----------------------
<PAGE>   2
THIS SUB-LEASE CONTRACT is made the 15th day of July, 1994

- -------------------------

BETWEEN:

(1)      Simon-Horizon Limited, registered no. 467924, of Horizon House, Azalea
         Drive, Swanley, Kent BR8 8JR (.Simon.)

(2)      Horizon Exploration Limited, registered no. 2804983, of 6 Pembroke
         Road, Seven Oaks, Kent TN13 1XR ("the Lessee")

WHEREAS:

(A)      Simon has pursuant to a Master Leasing Agreement dated 31st March 1992
         between Simon and Royal Bank of Scotland (Industrial Leasing) Limited
         (the "Owners") and a lease contract, contract number RS920/0022 (dated
         31st March 1992) (together the "RBS Leasing Contracts") between Simon
         and the Owner leased from the Owner all the assets and equipment the
         subject of this Sub-Lease Contract and it is the intention of Simon
         and the Lessee that the Lessee shall enter into this Sub-Lease
         Contract upon terms and conditions substantially identical in all
         material respects to the terms and conditions of the RBS Leasing
         Contract.

(B)      The parties hereto have entered into a Master Leasing Agreement
         ("Master Agreement") of even date herewith.

(C)      This Sub-Lease Contract (incorporating Schedules I, II and III hereto)
         is entered into pursuant to the Master Agreement.

NOW IT IS HEREBY AGREED as follows:

1.       (a)     The terms defined in and for the purposes of the Master
                 Agreement shall have the same meanings herein.

         (b)     The provisions of the Master Agreement and any special terms
                 stated in Schedules II and III hereto shall be deemed to be
                 incorporated herein. In the event of any conflict between the
                 provisions of the Master Agreement and the remaining
                 provisions of this Agreement the latter shall prevail.

2.       Simon shall let and the Lessee shall take on lease the Goods as
         described in Schedule I hereto.

3.       The Original Cost of the Goods exclusive
         of recoverable Value Added Tax is              L.469,047.79

         Recoverable VAT is                             L.82,083.36





                                       2
<PAGE>   3
         TOTAL COST                                     L.551.131.15

4.       (a)     The Primary Period shall be deemed to have commenced on 1992
                 ("the Prime Date"), and the last day of this period shall be 1
                 April 2001.

         (b)     The Secondary Period shall terminate in accordance with the
                 provisions of Clause 3.06 of the Master Agreement.

5.       (a)     The Rentals for the Goods during the Primary Period are
                 (subject to adjustment pursuant to Clause 5.04 of the Master
                 Agreement) set out in the table below;

<TABLE>
<CAPTION>
         Number           Rental           Rental           Rental Payments
         of Rentals       Amount           Frequency        Commencing on
         -----------      -------          ----------       -------------
         <S>              <C>              <C>              <C>
         1                L.6,594.81       Monthly          1 March 1992
         followed by

         109              L.6,594.81       Monthly          1 April 1992
</TABLE>

         (b)     The Rentals for the Goods during the Secondary Period shall be
                 L.938.10 p.a. All Secondary Period Rentals shall be paid
                 annually in advance with the first rental payment being due on
                 2 April 2001.

         (c)     Value Added Tax will be applied to the Primary and Secondary
                 Period Rentals at the applicable rate.

         (d)     Unless otherwise agreed by Simon the method for payment of
                 Rentals shall be by Standing Order. Payment of Rentals (and
                 any other payments falling due) shall be effected for full
                 value in cleared funds in the hands of Simon on or before the
                 relevant date of payment; if a date of payment is not a
                 business day in England then the date for payment shall be
                 deemed to be the previous such business day occurring.

         (e)     The bank account for payment of Rentals and other amounts due
                 is unless otherwise notified to the Lessee the account of
                 Royal Bank of Scotland (Industrial Leasing) Limited, account
                 number 12176088 with The Royal Bank of Scotland plc, 45 The
                 Promenade, Cheltenham Gloucestershire, GL50 1PY.

         (f)     The Rentals and Termination Sums are subject to the Special
                 Terms set out in Schedules II and III.

6.       For the purposes of Clause 5.04 (a) (ii) of the Master Agreement it is
         assumed that:

          (a)     the Owner shall be entitled to capital allowances in





                                       3
<PAGE>   4
                 respect of the Original Cost of the Goods namely, Writing Down
                 Allowances on the reducing balance of Original Cost, on the
                 following basis.


<TABLE>
<CAPTION>
         Accounting Period                                  Capital Allowances
         of Owner                                           Writing Down %
         -----------------                                  ------------------
         <S>                                                <C>
         31 March 1992                                      25%

         (and thereafter)

</TABLE>

      (b)     The Calculation Rates shall be at the rate specified below:

<TABLE>
              <S>                    <C>                         <C>
              In the period from     01.04.90 to 31.03.91         34%
                                     01.04.91 to 31.03.92         33% and
                                                       thereafter 33%
</TABLE>

7.       The Site of the Goods is on the seismic survey vessel the MV Simon
         Labrador.

8.       If the Lessee acts as sales sub-agent for Simon or agent for the Owner
         to dispose of the Goods the Lessee will be entitled to 98% of the net
         sales proceeds by way of rebate of rentals under Clause 17.02 of the
         Master Agreement. The Sales Agency shall end six months after the
         Lease Period expires.

9.       The discount rate (referred to in Clause 14.03(b)(ii) of the Master
         Leasing Agreement) shall be 5% per annum.

10.      This Contract shall be governed by and construed in accordance with
         English Law.

11.      The Lessee's attention is drawn to Clause 5.09 of the Master
         Agreement, under which irrespective of the accounting treatment to be
         adopted by the Lessee, the Lessee is not entitled to claim capital
         allowances on the Goods.

IN WITNESS whereof this Agreement has been entered into the day and year first
before written.





                                       4
<PAGE>   5
                                   SCHEDULE I


                              DESCRIPTION OF GOODS


1 Sony Colour Monitor
1 Slipring Unit
2 AST 386 PC Unit
2 Streamer Diverter Bodies
3 Break Out Box Components
1 Digital Dead Section
2 Hydro Streamer Cables
2 Streamer Fish
2 Spooler Block Control Valves
Tow Upgrade Connectors
1 Gun Depth Monitoring System
1 Modified Gun Fish
Streamer Connectors
2 Umbilical Upgrades
Umbilical Termination Components
Installation Costs
Computer Upgrades
Pneumatic Power Tools
Acoustics Upgrades
Air Start Motor
Spares Pack for Compressor
Seawater De-Salination Plant
DNV Classification Fee
Additional Shipyard's Costs
Miscellaneous Small Value Items





                                       5
<PAGE>   6
                                  SCHEDULE II
                                 SPECIAL TERMS

The Rentals in this contract are variable for interest throughout the Primary
Period. For the purposes of Clause 5.04 of the Master Agreement each Rental is
based on the assumption that on the first relevant date as shown below the
Sterling London Interbank Rate Offered by The Royal Rank of Scotland Plc for
monies of the relevant amount and period at or about 11.00 am ("LIBOR") will be
10% p.a and that on each successive relevant date Three Month Sterling London
Interbank Rate Offered by the Royal Bank of Scotland plc for monies of the
relevant amount at or about 11 a.m. "LIBOR") on the relevant date as shown
below will be log per annum. LIBOR will be conclusively certified by the Owner
to Simon who will notify the Lessee of such certificate.

If LIBOR is greater on the relevant date the Lessee shall pay to Simon a
supplemental rental on the settlement date as shown below. If LIBOR is less on
the relevant date Simon shall following receipt of an equal amount from the
Owner pay to the Lessee a rebate of rental on the settlement date. The
supplemental rental or rebate of rental will be calculated by multiplying the
difference between LIBOR on the relevant date and 10% per annum (rounded to two
decimal places above) by the appropriate rental adjustment factor shown below.
Provided always that if there is any change to the rentals in accordance with
Clause 5.04 of the Master Agreement new rental adjustment factors will be
provided.





                                       6
<PAGE>   7
<TABLE>
<CAPTION>
                                                     Rental Adjustment Factors
                                                     per L.1.000 of Original
Relevant Date                                        Cost for each 1% p.a.
for Setting LIBOR         Settlement Date            movements in LIBOR
- -----------------         ----------------           ------------------
    <S>                       <C>                           <C>
    10.02.92                  01.04.92                      L.1.42
    01.04.92                  01.07.92                      L.2.49
    01.07.92                  01.10.92                      L.2.48
    01.10.92                  01.01.93                      L.2.43
    01.01.93                  01.04.93                      L.2.14
    01.04.93                  01.07.93                      L.2.12
    01.07.93                  01.10.93                      L.2.09
    01.10.93                  01.01.94                      L.2.04
    01.01.94                  01.04.94                      L.1.86
    01.04.94                  01.07.94                      L.1.83
    01.07.94                  01.10.94                      L.1.79
    01.10.94                  01.01.95                      L.1.73
    01.01.95                  01.04.95                      L.1.60
    01.04.95                  01.07.95                      L.1.56
    01.07.95                  01.10.95                      L.1.51
    01.10.95                  01.01.96                      L.1.44
    01.01.96                  01.04.96                      L.1.36
    01.04.96                  01.07.96                      L.1.29
    01.07.96                  01.10.96                      L.1.23
    01.10.96                  01.01.97                      L.1.16
    01.01.97                  01.04.97                      L.1.09
    01.04.97                  01.07.97                      L.1.03
    01.07.97                  01.10.97                      L.0.96
    01.10.97                  01.01.98                      L.0.88
    01.01.98                  01.04.98                      L.0.83
    01.04.98                  01.07.98                      L.0.76
    01.07.98                  01.10.98                      L.0.68
    01.10.98                  01.01.99                      L.0.59
    01.01.99                  01.04.99                      L.0.57
    01.04.99                  01.07.99                      L.0.49
    01.07.99                  01.10.99                      L.0.40
    01.10.99                  01.01.00                      L.0.30
    01.01.00                  01.04.00                      L.0.29
    01.04.00                  01.07.00                      L.0.20
    01.07.00                  01.10.00                      L.0.10
    01.10.00                  and thereafter                NIL
</TABLE>

If any of the above dates are not business days the previous business day will
be used.

The calculation of the supplemental rental or rebate of rental are subject to a
minimum LIBOR of 7% per annum.





                                       7
<PAGE>   8
                                  SCHEDULE III

<TABLE>
<CAPTION>
Termination      Termination                  Termination          Termination
Date             Sum                          Date                  Sum
- -----            ----                         -----                 ---
<S>             <C>                   <C>     <C>                   <C>
1 March 1992     1032.91              1       October 1995          751.40
1 April 1992     1025.55              1       November 1995         743.71
1 May 1992       1021.01              1       December 1995         735.72
1 June 1992      1016.79              1       January 1996          727.85
1 July 1992      1012.21              1       February 1996         719.91
1 August 1992    1007.93              1       March 1996            711.03
1 Sept. 1992     1003.60              1       April 1996            696.09
1 Oct. 1992       998.90              1       May 1996              687.67
1 Nov. 1992       994.48              1       June 1996             679.34
1 Dec. 1992       989.70              1       July 1996             670.74
1 January 1993    985.17              1       August 1996           662.25
1 Feb. 1993       980.10              1       September 1996        653.66
1 March 1993      973.43              1       October 1996          644.79
1 April 1993      962.62              1       November 1996         636.03
1 May 1993        957.07              1       December 1996         627.00
1 June 1993       951.74              1       January 1997          618.04
1 July 1993       946.06              1       February 1997         609.06
1 August 1993     940.63              1       March 1997            599.15
1 Sept. 1993      935.13              1       April 1997            583.88
1 October 1993    929.28              1       May 1997              574.44
1 Nov. 1993       923.67              1       June 1997             565.04
1 Dec. 1993       917.71              1       July 1997             553.39
1 January 1994    911.96              1       August 1997           545.81
1 Feb. 1994       905.96              1       September 1997        536.11
1 March 1994      898.52              1       October 1997          526.18
1 April 1994      885.64              1       November 1997         516.30
1 May 1994        879.15              1       December 1997         506.17
1 June 1994       872.83              1       January 1998          496 07
1 July 1994       866.20              1       February 1998         485.99
1 August 1994     859.76              1       March 1998            475.16
I Sept. 1994      853.24              1       April 1998            459.95
1 October 1994    846.40              1       May 1998              449.42
1 Nov. 1994       839.76              1       June 1998             438.89
1 Dec. 1994       832.79              1       July 1998             428.14
1 January 1995    825.99              1       August 1998           417.40
1 Feb. 1995       819.03              1       September 1998        406.55
1 March 1995      810.80              1       October 1998          395.48
1 April 1995      796.57              1       November 1998         384.41
1 May 1995        789.13              1       December 1998         373.13
1 June 1995       781.83              1       January 1999          361.83
1 July 1995       774.22              1       February 1999         350.58
1 August 1995     766.77              1       March 1999            338.77
1 Sept. 1995      759.23              1       April 1999            323.90
1 May 1999        312.21              1       May 2000              162,29
1 June 1999       300.48              1       June 2000             149.28
1 July 1999       288.55              1       July 2000             136.10
1 August 1999     276.59              1       August 2000           122.82
</TABLE>





                                       8
<PAGE>   9
<TABLE>
<S>                   <C>            <C>     <C>                       <C>
1 Sept. 1999          264.50          1       September 2000            109.41
1 October 1999        252.23          1       October 2000               95.85
1 Nov. 1999           239.90          1       November 2000              82.18
1 Dec. 1999           227.39          1       December 2000              68.40
1 January 2000        214.81          1       January 2001               54.57
1 February 2000       202.30          1       February 2001              40.72
1 March 2000          189.49          1       March 2001                 26.76
1 April 2000          175.22          1       April 2001                 14.06
</TABLE>

The Termination Sums detailed above (which are stated per L.1000 of
Original Cost) have been calculated on the basis of the assumptions contained
in Clause 5.04(a) of the Master Agreement and Clause 6 of this Sub-Lease
Contract. The Termination Sums also assume that LIBOR in the Rental Period
during which termination occurs is log per annum, and that termination will
occur on one of the dates detailed above. In the event that a termination
occurs on any date other than a date detailed above, or that any of the other
aforementioned assumptions prove to be incorrect as at the date of termination,
with the result that the Return of the Owner in relation to the Goods in
respect of which such termination has occurred is altered, the amount of the
Termination Sums which falls due on such termination date shall be adjusted
upwards or downwards by such amount required to ensure that the Return of the
Owner, in relation to those Goods, is the same as it would have been had the
relevant assumption (and all other assumptions) proved to be correct.

The above Termination Sums will not apply in the event of the Lessee
repudiating the Master Agreement by a breach of the terms thereof in which case
the terms of Clause 14.03(b) apply. The above Termination Sums have been
calculated on the assumption that the Goods are sold for their tax written down
value in the accounts of the Owner at the time such disposal is completed; in
the event that this assumption proves to be incorrect the above Termination
Sums will be adjusted in such a manner as to maintain the Owner's Return taking
into account the actual disposal proceeds.





                                       9
<PAGE>   10
AS WITNESS the hands of the representatives duly authorized on behalf of the
parties hereto the day and year first written above,

SIGNED BY                             SIGNED BY
          ------------------------             ------------------------------

SIGNATURE /s/[illegible signature]    SIGNATURE /s/ G.M. Harrison

DESIGNATION                           DESIGNATION                     
          ------------------------                ----------------------------
on behalf of Simon                    for and on behalf of the Lessee
in the presence of:                   in the presence of:

WITNESS /s/ Andrew R. Murray          WITNESS /s/ Andrew R. Murray

*FULL NAME Andrew R. Murray           *FULL NAME Andrew R. Murray

ADDRESS                               ADDRESS
       ---------------------------            --------------------------------

- ----------------------------------           ---------------------------------

- ----------------------------------           ---------------------------------
*Complete name in full in typewriting or block capitals





                                       10
<PAGE>   11
Note

Lessee must complete acceptance certificate overleaf.





                                       11

<PAGE>   1
                                                                  EXHIBIT 10.9.8



                    Dated                   15th July, 1994



                        (1) SIMON-HORIZON LIMITED


                        (2) HORIZON EXPLORATION LIMITED





                               SUB-LEASE CONTRACT
                                    Number 2





                               SIMMONS & SIMMONS
                               14 DOMINION STREET
                                LONDON EC2M 2RJ
                            REF: 5A/P37800/AZM 1030m
<PAGE>   2
[Contract No: RS920/00171

THIS SUB-LEASE CONTRACT is made the 15th day of July, 1994

BETWEEN:

(1)      Simon-Horizon Limited, registered no. 467924, of Horizon House, Azalea
         Drive, Swanley, Kent BR8 8JR ("Simon")

(2)      Horizon Exploration Limited, registered no. 2804983 of 6 Pembroke
         Road, Sevenoaks, Kent TN13 1XR ("the Lessee")

WHEREAS:

(A)      Simon has pursuant to a Master Leasing Agreement dated 31st March 1992
         between Simon and Royal Bank of Scotland (Industrial Leasing) Limited
         (the "Owners") and a lease contract, contract number RS920/0017 (dated
         31st March 1992) (together the "RBS Leasing Contracts") between Simon
         and the Owner leased from the Owner all the assets and equipment the
         subject of this Sub-Lease Contract and it is the intention of Simon
         and the Lessee that the Lessee shall enter into this Sub-Lease
         Contract upon terms and conditions substantially identical in all
         material respects to the terms and conditions of the RBS Leasing
         Contract

(B)      The parties hereto have entered into a Master Leasing Agreement
         ("Master Agreement") of even date herewith.

(C)      This Lease Contract (incorporating Schedules I, II and III hereto) is
         entered into pursuant to the Master Agreement.

NOW IT IS HEREBY AGREED as follows.

1.       (a)     The terms defined in and for the purposes of the Master
                 Agreement shall have the same meanings herein.

         (b)     The provisions of the Master Agreement and any special terms
                 stated in Schedules II and III hereto shall be deemed to be
                 incorporated herein. In the event of any conflict between the
                 provisions of the Master Agreement and the remaining
                 provisions of this Agreement the latter shall prevail.

2.       Simon shall let and the Lessee shall take on lease the Goods as
         described in Schedule I hereto.

<TABLE>
<S>      <C>                                                 <C>
3.       The Original Cost of the Goods exclusive     
         of recoverable Value Added Tax is                   L.1,000,212.47
                                                      
         Recoverable VAT is                                  L. 175,037.18
                                                      
         TOTAL COST                                          L.1,175,249.65
</TABLE>





                                       2
<PAGE>   3
4.       (a)     The Primary Period shall be deemed to have commenced on  1992
                 ("the Prime Date"), and the last day of this period shall be 1
                 April 2001.

         (b)     The Secondary Period shall terminate in accordance with the
                 provisions of Clause 3.06 of the Master Agreement.

5.       (a)     The Rentals for the Goods during the Primary Period are
                 (subject to adjustment pursuant to Clause 5.04 of the Master
                 Agreement) set out in the table below:

<TABLE>
<CAPTION>
                 Number of                 Rental                   Rental           Rental Payments
                 Rentals                   Amount                   Frequency        Commencing on
                 -------                   ------                   ---------        -------------
                 <S>                       <C>                      <C>                <C>
                 1                         L.14,353.05              Monthly            1 May 1992
                 followed by

                 109                       L.14,363.05              Monthly            1 June 1992
</TABLE>

         (b)     The Rentals for the Goods during the Secondary Period shall be
                 L.938.10 p.a.  All Secondary Period Rentals shall be paid
                 annually in advance with the first rental payment being due on
                 April 2001.

         (c)     Value Added Tax will be applied to the Primary and Secondary
                 Period Rentals at the applicable rate.

         (d)     Unless otherwise agreed by Simon the method for payment of
                 Rentals shall be by Standing Order.  Payment of Rentals (and
                 any other payments falling due) shall be effected for full
                 value in cleared funds in the hands of Simon on or before the
                 relevant date of payment; if a date of payment is not a
                 business day in England then the date for payment shall be
                 deemed to be the previous such business day occurring.

         (e)     The bank account of Simon for payment of Rentals and other
                 amounts due is unless otherwise notified to the Lessee the
                 account of Royal Bank of Scotland (Industrial Leasing) Limited
                 account number 12176088 with The Royal Bank of Scotland plc,
                 45 The Promenade, Cheltenham, Gloucestershire, GL50 1PY.

         (f)     The Rentals and Termination Sums are subject to the Special
                 Terms set out in Schedules II and III.

6.       For the purposes of Clause 5.04 (a) (ii) of the Master Agreement it is
         assumed that:

         (a)     the Owner shall be entitled to capital allowance in respect of
                 the Original Cost of the Goods namely, Writing Down Allowances
                 on the reducing balance of Original Cost, on the following
                 basis.





                                       3
<PAGE>   4
<TABLE>
<CAPTION>
                 Accounting Period                    Capital Allowances
                 of Owner                             Writing Down %
                 --------                             --------------
                 <S>                                       <C>
                 31 March 1992                              25%
</TABLE>

                 (and thereafter)

      (b)     The Calculation Rates shall be at the rate specified below:

<TABLE>
              <S>                      <C>                       <C>
              In the period from       01.04.90 to 31.03.91       34%
                                       01.04.91 to 31.03.91       33% and
                                                                  thereafter 33%
</TABLE>

7.       The Site of the Goods is on the seismic survey vessel the MV Simon
         Labrador.

8.       If the Lessee acts as sales sub-agent for Simon or agent for the Owner
         to dispose of the Goods the Lessee will be entitled to 98% of the net
         sales proceeds by way of rebate or rentals under Clause 17.02 of the
         Master Agreement.  The Sales Agency shall end six months after the
         Lease Period expires.

9.       The discount rate (referred to in Clause 14.03(b)(ii) of the Master
         Leasing Agreement) shall be 5% per annum.

10.      This Contract shall be governed by and construed in accordance with
         English law.

11.      The Lessee's attention is drawn to Clause 5.09 of the Master
         Agreement, under with irrespective of the accounting treatment to be
         adopted by the Lessee, the Lessee is not entitled to claim capital
         allowances on the Goods.

IN WITNESS whereof this Agreement has been entered into the day and year first
before written.





                                       4
<PAGE>   5
                                   SCHEDULE I

                              DESCRIPTION OF GOODS

4        Armoured Tow Leaders

60       Active Sections

15       Digitising Modules

1        Spooler Block

Gun Fish/Float Components

ISC-72 Computer

2 Lead-in Winches

32       RCL-5 Compass/Levellers

1        RTB I/P System

3        HGPS Transceivers

2        XSRS Transceivers

2        Streamer Diverter Bodies

66       Streamer Connections

2        Syntrak Cartridge Drive System

1        Storagetelle Tape Drive Unit

1        Tape Cleaner

1        Syntrak Memory Upgrade

Miscellaneous Small Value Items





                                       5
<PAGE>   6
                                  SCHEDULE II

                                 SPECIAL TERMS


The Rentals in this contract are variable for interest throughout the Primary
Period. For the purposes of Clause 5.04 of the Master Agreement each Rental is
based on the assumption that on the first relevant date as shown below the
Sterling London Interbank Rate Offered by The Royal Bank of Scotland plc for
monies of the relevant amount and period at or about 11.00 am ("LIBOR") will be
10% p.a and that on each successive relevant date Three Month Sterling London
Interbank Rate Offered by the Royal Bank of Scotland Plc for monies of the
relevant amount at or about 11 a.m. "LIBOR") on the relevant date as shown
below will be 10% per annum. LIBOR will be conclusively certified by the Owner
to Simon who will notify the Lessee of such certification.

If LIBOR is greater on the relevant date the Lessee shall pay to Simon a
supplemental rental on the settlement date as shown below. If LIBOR is less on
the relevant date Simon shall following receipt of an equal amount from the
Owner pay to the Lessee a rebate of rental on the settlement date. The
supplemental rental or rebate of rental will be calculated by multiplying the
difference between LIBOR on the relevant date and log per annum (rounded to two
decimal places above) by the appropriate rental adjustment factor shown below.
Provided always that if there is any change to the rentals in accordance with
Clause 5.04 of the Master Agreement new rental adjustment factors will be
provided.





                                       6
<PAGE>   7
<TABLE>
<CAPTION>                                         
                                                        Rental Adjustment Factors
                                                        per L.1,000 of Original
Relevant Date                                           Cost for each 1% p.a.
for Setting LIBOR           Settlement Date             movements in LIBOR
- -----------------           ---------------             ------------------
     <S>                         <C>                         <C>
     01.04.92                    01.07.92                    L.2.52
     01.07.92                    01.10.92                    L.2.50
     01.10.92                    01.01.93                    L.2.46
     01.01.93                    01.04.93                    L.2.14
     01.04.93                    01.07.93                    L.2.14
     01.07.93                    01.10.93                    L.2.10
     01.10.93                    01.01.94                    L.2.05
     01.01.94                    01.04.94                    L.1.86
     01.04.94                    01.07.94                    L.1.86
     01.07.94                    01.10.94                    L.1.80
     01.10.94                    01.01.95                    L.1.74
     01.01.95                    01.04.95                    L.1.60
     01.04.95                    01.07.95                    L.1.57
     01.07.95                    01.10.95                    L.1.52
     01.10.95                    01.01.96                    L.1.45
     01.01.96                    01.04.96                    L.1.36
     01.04.96                    01.07.96                    L.1.30
     01.07.96                    01.10.96                    L.1.24
     01.10.96                    01.01.97                    L.1.18
     01.01.97                    01.04.97                    L.1.10
     01.04.97                    01.07.97                    L.1.04
     01.07.97                    01.10.97                    L.0.97
     01.10.97                    01.01.98                    L.0.89
     01.01.98                    01.04.98                    L.0.84
     01.04.98                    01.07.98                    L.0.77
     01.07.98                    01.10.98                    L.0.69
     01.10.98                    01.01.99                    L.0.60
     01.01.99                    01.04.99                    L.0.57
     01.04.99                    01.07.99                    L.0.49
     01.07.99                    01.10.99                    L.0.40
     01.10.99                    01.01.00                    L.0.30
     01.01.00                    01.04.00                    L.0.29
     01.04.00                    01.07.00                    L.0.20
     01.07.00                    01.10.00                    L.0.10
     01.10.00                    and thereafter              NIL
</TABLE>

If any of the above dates are not business days the previous business day will
be used.

The calculation of the supplemental rental or debate of rental are subject to a
minimum LIBOR of 7% per annum.





                                       7
<PAGE>   8
                                  SCHEDULE III

<TABLE>
<CAPTION>                            
Termination             Termination       Termination               Termination
Date                    Sum               Date                      Sum
- -----                   ----              -----                     ---
<S>                     <C>               <C>                       <C>
1 May 1992              1030.49           1 November 1995           754.88
1 June 1992             1026.37           1 December 1995           746.87
1 July 1992             1021.89           1 January 1996            738.97
1 August 1992           1017.76           1 February 1996           731.00
1 September 1992        1013.56           1 March 1996              722.52
1 October 1992          1008.98           1 April 1996              706.91
1 November 1992         1004.70           1 May 1996                698.44
1 December 1992         1000.04           1 June 1996               690.07
1 January 1993           995.64           1 July 1996               681.42
1 February 1993          990.68           1 August 1996             672.87
1 March 1993             984.75           1 September 1996          664.23
1 April 1993             973.17           1 October 1996            655.30
1 May 1993               967.71           1 November 1996           646.48
1 June 1993              962.48           1 December 1996           637.37
1 July 1993              956.89           1 January 1997            628.34
1 August 1993            951.55           1 February 1997           619.29
1 September 1993         946.14           1 March 1997              609.63
1 October 1993           940.38           1 April 1997              593.77
1 November 1993          934.86           1 May 1997                584.23
1 December 1993          928.98           1 June 1997               574.75
1 January 1994           923.31           1 July 1997               565.01
1 February 1994          917.35           1 August 1997             555.32
1 March 1994             910.51           1 September 1997          545.53
1 April 1994             896.88           1 October 1997            535.49
1 May 1994               890.42           1 November 1997           525.49
1 June 1994              884.15           1 December 1997           515.24
1 July 1994              877.54           1 January 1998            505.02
1 August 1994            871.13           1 February 1998           494.82
1 September 1994         864.64           1 March 1998              484.12
1 October 1994           857.82           1 April 1998              468.38
1 November 1994          851.20           1 May 1998                457.70
1 December 1994          844.24           1 June 1998               447.04
1 January 1995           837.45           1 July 1998               436.15
1 February 1995          830.50           1 August 1998             425.26
1 March 1995             822.76           1 September 1998          414.25
1 April 1995             807.83           1 October 1998            403.03
1 May 1995               800.38           1 November 1998           391.79
1 June 1995              793.08           1 December 1998           380.33
1 July 1995              785.46           1 January 1999            368.85
1 August 1995            778.00           1 February 1999           357.44
1 September 1995         770.45           1 March 1999              345.62
1 October 1995           762.59           1 April 1999              330.28
1 May 1999               318.40           1 May 2000                165.73
1 June 1999              306.47           1 June 2000               152.45
</TABLE>           





                                       8
<PAGE>   9
<TABLE>
<S>                      <C>              <C>                       <C>
1 July 1999              294.35           1 July 2000               139.01
1 August 1999            282.18           1 August 2000             125.47
1 September 1999         269.88           1 September 2000          111.78
1 October 1999           257.39           1 October 2000             97.93
1 November 1999          244.83           1 November 2000            83.96
1 December 1999          232.09           1 December 2000            69.89
1 January 2000           219.27           1 January 2001             55.76
1 February 2000          206.54           1 February 2001            41.62
1 March 2000             193.57           1 March 2001               27.36
1 April 2000             178.90           1 April 2001               14.36
</TABLE>                 

The Termination Sums detailed above (which are stated per L.1000 of Original
Cost) have been calculated on the basis of the assumptions contained in Clause
5.04(a) of the Master Agreement and Clause 6 of this Sub-Lease Contract.  The
Termination Sums also assume that LIBOR in Rental Period during which
termination occurs is 10% per annum, and that termination will occur on one of
the dates detailed above.  In the event that a termination occurs on any date
other than a date detailed above, or that any of the other aforementioned
assumptions prove to be incorrect as at the date of termination, with the
result that the Return of the Owner in relation to the Goods in respect of
which such termination has occurred is altered, the amount of the Termination
Sums which falls due on such termination date shall be adjusted upwards or
downwards by such amount required to ensure that the Return of the Owner, in
relation to those Goods, is the same as it would have been had the relevant
assumption (and all other assumptions) proved to be correct.

The above Termination Sums will not apply in the event of the Lessee
repudiating the Master Agreement by a breach of the terms thereof in which case
the terms of Clause 14.03(b) apply.  The above Termination Sums have been
calculated on the assumption that the Goods are sold for their tax written down
value in the accounts of the Owner at the time such disposal is completed; in
the event that this assumption proves to be incorrect the above Termination
Sums will be adjusted in such a manner as to maintain the Owner's Return taking
into account the actual disposal proceeds.





                                       9
<PAGE>   10
AS WITNESS the hands of the representatives duly authorized on behalf of the
parties hereto the day and year first written above.

SIGNED BY ___________________              SIGNED BY _____________________

SIGNATURE /s/ [illegible signature]        SIGNATURE /s/ G.M. Harrison

DESIGNATION _________________              DESIGNATION ___________________
for and on behalf of Simon                 for and on behalf of the Lessee
in the presence of:                        in the presence of:


WITNESS /s/ Andrew R. Murray               WITNESS /s/ Andrew R. Murray

*FULL NAME Andrew R. Murray                FULL NAME Andrew R. Murray

ADDRESS _____________________              ADDRESS _______________________

_____________________________              _______________________________

_____________________________              _______________________________
*Complete name in full in typewriting or block capitals




Note

Lessee must complete acceptance certificate overleaf.





                                       10
<PAGE>   11
                             ACCEPTANCE CERTIFICATE

Attachment to Sub-Lease Contract

To be completed by the Lessee in Duplicate (where required)

From:

Name in Full              Horizon Exploration Limited
Business                  The Provision of Geophysical Services
Address                   6 Pembroke Road
                          Sevenoaks
                          Kent  TN  13  1XR

Bankers  
        ------------------------------------------------------
 
Insurance Broker
or Company       
                 ---------------------------------------------
Address 
        ------------------------------------------------------
 

To               Simon-Horizon Limited

We hereby confirm and certify to you that:

(i)      We have duly received the Goods and we hereby acknowledge that these
         goods are the Goods referred to in Schedule I to the Sub-Lease
         Contract detailed below;

(ii)     We have duly inspected the Goods on               at      and we are
         satisfied that the Goods are complete and the Goods are in all
         respects in good working order and condition;

(iii)    All safety regulations in relation to the Goods have been complied
         with and all required or recommended safety apparatus or appliances
         (if any) have been correctly installed or supplied with the Goods as
         the case may be;

(iv)     Insurance cover in respect of the Goods has been effected in
         accordance with the terms of the Master Agreement.

Description of Goods

         As per Schedule I to the said Sub-Lease Contract No. 2 dated 15th July
1994


For and on behalf of Horizon Exploration Limited.

- ---------------------------------

Dated 
      ------------------




                                       11

<PAGE>   1
                                                                  EXHIBIT 10.9.9


                                   AGREEMENT

THIS AGREEMENT is made this 15th day of July, 1994 between

(1)      SIMON-HORIZON LIMITED registered number 467924 ("Simon") a company
         incorporated in England and Wales with registered office at Horizon
         House, Azalea Drive, Swanley, Kent BR8 8JR; and

(2)      SIMON PETROLEUM TECHNOLOGY LIMITED registered number 2720413 ("SPT") a
         company incorporated in England and Wales with registered office at
         Ty'n-y-Coed, Llanrhos, Llandudno, North Wales; and

(3)      SIMON ENGINEERING PLC registered number 52665 ("SEL") a company
         incorporated in England and Wales with registered office at Simon
         House, Bird Hall Lane, Stockport, Cheshire SK3 ORJ; and

(4)      HORIZON EXPLORATION LIMITED registered number 2804983 ("HEL") a
         company incorporated in England and Wales with registered office at 6
         Pembroke Road, Sevenoaks, Kent, TN13 1XR.

1.       Interpretation

1.1      In this Agreement, including the Schedules:

         1.1.1   The following words and expressions shall have the following
                 meanings unless they are inconsistent with the context:

         "Additional Equipment"   the equipment referred to in Clause 3.2.1;

         "Agreement"              this agreement;

         "Assignment Agreement"   the assignment agreement in Agreed Form of
                                  even date herewith made between Simon and HEL
                                  in respect of the Management Agreement;

         "Business Competitor     a competitor of HEL or of Exploration
         of HEL"                  Holdings Limited or any of such company's 
                                  subsidiaries from time to time in relation 
                                  to the provision of offshore seismic data 
                                  acquisition services;





                                       1
<PAGE>   2
         "Charter"                the charterparty in Agreed Form by sub-demise
                                  of even date herewith made between Simon and
                                  HEL in respect of the Vessel;

         "Connected"              for the purposes of Clause 3.2.5 has the
                                  meaning set out in Section 249 of the
                                  Insolvency Act 1986;

         "Deed of Assignment"     the Deed of Assignment of insurances of Goods
                                  subject to the Leases in Agreed Form of even
                                  date herewith between Simon and HEL;

         "Effective Date"         30th June, 1994;

         "Ervik"                  Ervik Marine Services A/S;

         "Excluded Equipment"     the equipment so defined in the Charter;

         "Guarantee"              the continuing cross-guarantee and indemnity
                                  in Agreed Form to be entered into by the
                                  companies comprising the HEL Group in favor
                                  of Simon, SPT and SEL;

         "HEL Group"              Horizon Seismic Inc., Exploration Holdings
                                  Limited, HEL and each of their subsidiaries
                                  from time to time;

         "Leases"                 the sub-leases in Agreed Form of even date
                                  herewith entered into between Simon and HEL
                                  in respect of seismic and other equipment to
                                  be used on and in connection with the Vessel;

         "Management Agreement"   the management agreement dated 19th December
                                  1990, together with the First Addendum
                                  thereto also dated the same date between
                                  Simon and Ervik;

         "Master Lease Agreement" the master lease agreement in Agreed Form of
                                  even date herewith entered into between Simon
                                  and HEL;

         "Owner"                  Royal Bank of Scotland (Industrial Leasing)
                                  Limited;

         "RBS Charter"            the charterparty by way of Demise dated 20th
                                  December, 1990 and made between the Owner and
                                  Simon;

         "RBS Leases"             if the Master Lease Agreement dated 31st
                                  March, 1992 and the Lease Contracts Nos.
                                  RS920/0017 and





                                       2
<PAGE>   3
                                  RS920/0022 each dated 31st March, 1992, all 
                                  made between the Owner and Simon;

         "Retained Equipment"     the equipment so defined in the Charter;

         "Sale Agreement"         the undated "Agreement for Sale of a
                                  Business" executed in July 1993 between
                                  Simon, SPT and HEL;

         "SEL Guarantee"          the Guarantee by Simon Engineering Plc in
                                  favour of the Owner dated 20th December, 1990

         "Simon Labrador"         the M.V. "Simon Labrador" (ex M.V. "Seaway
         and "Vessel"             Labrador");

         "Subsidiaries"           shall have the meaning ascribed thereto
                                  pursuant to section 736 of the Companies Act
                                  1985;

         "Syntron"                Syntron Europe Limited, a company supplying
                                  and repairing marine seismic equipment;

         "Syntron Letter"         letter from SPT to HEL dated 18th August 1993
                                  agreeing to pay for streamer refurbishment on
                                  deferred terms.

         1.1.2   Reference to any document being in the "Agreed Form" means in
                 the form or in the terms agreed between the parties'
                 respective solicitors or attornies and references to any
                 document include references to that document as the same may
                 be amended from time to time.

         1.1.3   All references to a statutory provision shall be construed as
                 including references to:

                          (a)     any statutory modification, consolidation,
                                  re-enactment (whether before or after the
                                  date of this Agreement) for the time being in
                                  force;

                          (b)     all statutory instruments or orders made 
                                  pursuant to it; and

                          (c)     any statutory provisions of which it is a 
                                  consolidation, re-enactment or modification.

         1.1.4   Except where the context otherwise requires, words denoting
                 the singular include the plural and vice versa; words denoting
                 any gender include all genders; words denoting persons include
                 firms and corporations and vice versa.





                                       3
<PAGE>   4
         1.1.5   Unless otherwise stated, a reference to a clause, sub-clause
                 or Schedule is a reference to a clause or a sub-clause of, or
                 a Schedule to, this Agreement.

2.       Agreement

         2.1.1   HEL hereby undertakes for itself and to procure on the part of
                 each of the companies of the HEL Group the due exercise and
                 performance by HEL and of each of such companies of all of its
                 or their respective duties, obligations and liabilities under
                 the terms of the Charter, the Master Lease Agreement, the
                 Leases, the Guarantee, the Management Agreement, the
                 Assignment Agreement, the Deed of Assignment and this
                 Agreement (together the "HEL Documents") strictly in
                 accordance with such terms.  Subject only to the provisions of
                 Clause 4.1 and notwithstanding the provisions of any other HEL
                 Document, HEL hereby agrees unconditionally and irrevocably to
                 indemnify each of Simon, SPT and SEL and keep it and each of
                 them indemnified fully against any and all liabilities,
                 obligations, losses, damages, penalties, actions, judgements,
                 suits, costs, expenses or disbursements which may be imposed
                 on, incurred or suffered by or asserted against any of Simon,
                 SPT and SEL under or which are in any way related to the RBS
                 Charter, the RBS Leases, the Management Agreement, the SEL
                 Guarantee, the Syntron Letter, the Vessel, its ownership or
                 operation arising on or after the Effective Date in respect of
                 any period commencing on or after the Effective Date.  In
                 addition, HEL hereby agrees unconditionally and irrevocably to
                 indemnify each of Simon, SPT and SEL and keep it and each of
                 them indemnified fully against any and all liabilities,
                 obligations, losses, damages, penalties, actions, judgements,
                 suits, costs, expenses or disbursements which may be imposed
                 or incurred or suffered by or asserted against any of Simon,
                 SPT and SEL which directly or indirectly result from or are in
                 any way connected with or related to any act or omission under
                 or default by HEL or any HEL Group Company in the performance
                 of any of its obligations thereunder or under the HEL
                 Documents or any of them.  Notwithstanding the other
                 provisions of this Agreement or any provision of any other of
                 the HEL Documents, nothing contained herein or therein shall
                 avoid, exclude or limit in any way the liability of HEL in
                 respect of any act or omission for which HEL would have been
                 liable but for the entering into of the HEL Documents and the
                 transactions contemplated thereby.

         2.1.2   Each of Simon, SPT and SEL shall give prompt notice to HEL of
                 any action commenced against it or any claim or demand made
                 upon it in respect of which indemnity may be sought pursuant
                 to the indemnity in Clause 2.1.1.  HEL may participate at its
                 own expense in the defence of any such action, claim or
                 demand.  If it so elects within a reasonable time after
                 receipt of such notice, HEL may assume the defence of such
                 action claim or demand with legal advisers chosen by it and
                 approved by Simon, SPT and SEL (or the relevant one or more of
                 them against or upon whom such action, claim or demand is





                                       4
<PAGE>   5
                 made) unless they or the relevant one or more of them
                 reasonably object to the assumption on the grounds that there
                 may be legal defences available to them or it which are
                 different from or in addition to those available to HEL.  If
                 HEL so assumes the defense of such action claim or demand HEL
                 shall not be liable for the fees and expenses of more than one
                 legal adviser or firm of legal advisers of Simon, SPT and SEL
                 or the relevant one or more of them incurred thereafter in
                 connection therewith.  In no event shall HEL be liable for the
                 fees of more than one legal adviser or firm of legal advisers
                 of Simon or SPT or SEL in connection with any one action,
                 claim or demand or separate but similar or related actions in
                 the same jurisdiction arising out of the same general
                 allegations or circumstances.  HEL shall not be liable to
                 indemnify the relevant one or more of Simon, SPT and SEL for
                 any settlement of any action, claim or demand effected without
                 the consent of HEL (such consent not to be unreasonably
                 withheld or delayed).

         2.1.3   HEL shall pay to Simon and/or SPT and/or SEL (as the case may
                 be) on first demand such sum or sums as it or they may certify
                 as being payable to them pursuant to the indemnity in Clause
                 2.1.1.  Any certificate by Simon and/or SPT and/or SEL (as the
                 case may be) as to the amount of such costs shall, in the
                 absence of manifest error, be conclusive and binding upon HEL
                 and the HEL Group and each member company thereof.

         2.1.4   All payments pursuant to the indemnity referred to in Clause
                 2.1.1 shall be free and clear of and without deduction or
                 withholding for any tax of any nature now or hereafter imposed
                 by any country or any sub-division or taxing authority thereof
                 or therein or any federation or organization of which such
                 country is a member.  If any such payment shall be subject to
                 any such tax or if HEL shall be required to make any such
                 deduction or withholding, HEL shall pay to Simon and/or SPT
                 and/or SEL such additional amount as may be necessary to
                 enable Simon and/or SPT and/or SEL to receive, after all
                 deductions and withholdings, a net amount equal to the full
                 amount payable thereunder.  As used in this Clause the term
                 "tax" includes all levies, imposts, duties, charges, fees,
                 deductions, withholdings, turnover tax, transaction tax, stamp
                 tax and any interest or penalties thereon and any restrictions
                 or conditions resulting in a charge.

2.2      HEL agrees:

         2.2.1   to enter into the Charter, the Master Lease Agreement and
                 Leases on the date hereof;

         2.2.2   (a)      that the undated 1993 Management Agreement between
                          SPT, Simon and HEL shall terminate on the date
                          hereof, but without prejudice to the rights and
                          liabilities of the parties previously accrued; and





                                       5
<PAGE>   6
                 (b)      that the undated D.P. Software License Agreement made
                          between SPT and HEL executed in July 1993 is hereby
                          renewed for a period of twelve months from 1st July
                          1994 at an annual rental of US$120,000 (subject to
                          the addition of VAT and other applicable tax) for the
                          first 548 ship days and then at $110 per ship day
                          thereafter.  Such annual rental of $120,000 shall be
                          payable quarterly in advance in equal installments.
                          The first such instalment shall be payable on the
                          date hereof and the following installments shall be
                          payable on 1st October 1994, 1st January 1995 and 1st
                          April 1995 respectively.  Rental due for days in
                          excess of the first 548 ship days shall be payable
                          monthly in arrears;

                          SPT agrees that it will during the period of such
                          license continue to support such software under the
                          terms of the DP Software License Agreement and shall
                          give to HEL not less than nine months prior written
                          notice of ceasing to support such software.  HEL
                          shall give SPT not less than nine months prior
                          written notice of termination of the DP Software
                          License Agreement.

2.3      HEL hereby agrees that the terms of the undated letter agreement
         regarding apportionment of insurance deductibles (a copy of which is
         attached to this Agreement as Annex 1) shall cease for all purposes to
         have effect on and after the Effective Date and that HEL shall have no
         liability, present or future, thereunder.

2.4      Simon, SPT, SEL and HEL agree to use all reasonable endeavors to
         procure that the Owner shall agree to amend the provisions regarding
         the insurances of the Vessel:

         2.4.1   to reflect current market conditions in relation to
                 deductibles; and

         2.4.2   so that all losses payable thereunder shall be payable to the
                 Owner (except where, in relation to P & I payments such
                 payments are to be made to third parties who have suffered the
                 relevant loss if none of the parties to this Agreement has
                 previously paid or partly paid out such third party claim, or,
                 following such a payment or part payment out, where the
                 relevant party to this Agreement is entitled to be reimbursed
                 in respect thereof) regardless of the severity of the loss
                 sustained, but so that the Owner shall apply all sums received
                 which are less than L.250,000 in aggregate in respect of any
                 claim under the Hull and Machinery policies either by making
                 payment direct to contractors or yards in respect of works or
                 repairs done or to be done in respect of the relevant loss
                 payable or by payment in reimbursement of the relevant one of
                 Simon, SPT, SEL or HEL for sums expended by such party in
                 procuring the repair or works occasioned in relation to such
                 loss payable and so paid to the Owner.





                                       6
<PAGE>   7
3.       Continuing Obligations of HEL

3.1      HEL hereby covenants and agrees with and for the benefit of Simon, SPT
         and SEL that HEL will at all times hereafter fully perform its
         obligations pursuant to the Charter, the Master Lease Agreement and
         the Leases in a timely manner so as at all times to maintain and
         adhere to all the terms and conditions of the RBS Charter and the RBS
         Leases and maintain the same in full force and effect in accordance
         with their respective terms.

3.2      HEL further undertakes to Simon, SPT and SEL that HEL will:

         3.2.1   without prejudice to its obligations pursuant to the Charter
                 and the Leases (a) invest a minimum of US$950,000 in seismic
                 equipment for the Vessel within 3 months from the date of this
                 Agreement provided that if such investment is financed wholly
                 or partly by way of any leasing transaction it shall be upon
                 terms that such lease will be fully paid up within 18 months
                 from 1st June 1994 and will require only even monthly payments
                 on the part of the lessee (and shall not contain any balloon
                 payment obligations); and (b) continue to invest in the Vessel
                 to maintain it fit for purpose and in particular at all times
                 procure appropriate equipment and maintain all equipment from
                 time to time used on or in connection with the Vessel
                 sufficient to obtain three-dimensional seismic work in
                 accordance with current best practice and so as to remain (and
                 so that the Vessel shall remain) competitive in its field on
                 the basis (at any time and from time to time) of best
                 available techniques not involving excessive costs;

         3.2.2   use all reasonable endeavors to procure that whenever it
                 invests in equipment or assets for the Vessel by way of
                 leasing all such leases shall be made upon teems such that if
                 Simon shall pursuant to the terms of the Charter repossess the
                 Vessel, Simon shall be entitled to elect either to return such
                 leased assets to the respective lessors or take over the
                 relevant leases;

         3.2.3   deliver to Simon promptly after acquiring any such equipment
                 referred to in Clause 3.2.1 (a) (whether purchased or leased)
                 details of the equipment acquired and either (where such
                 equipment is purchased) Bills of Sale in respect thereof so as
                 formally to implement such transfer of title or (where such
                 equipment is leased) a copy of the relevant lease contract or
                 contracts.  HEL hereby undertakes that it will if required by
                 Simon forthwith upon payment out of the relevant lease or
                 leases deliver to Simon Bills of Sale in respect of any such
                 Additional Equipment so as to transfer title thereto to Simon.
                 All such equipment so transferred to Simon shall thereafter
                 for all purposes be deemed to be leased to HEL as if
                 specifically referred to in the Leases, provided that no
                 additional rental shall be paid in respect thereof;





                                       7
<PAGE>   8
         3.2.4   meet the remaining payments due to Syntron for the
                 refurbishment of the third streamer pursuant to the Syntron
                 Letter and agrees that none of Simon, SPT and SEL shall have
                 any further liability under or pursuant to the Syntron Letter;

         3.2.5   itself and will procure that HEL Group will maintain a
                 dividend cover of no less than four times earnings and
                 operating cash flows (determined in accordance with generally
                 accepted accounting principles in the United Kingdom) and
                 provide to Simon a certificate from HEL's or (if different)
                 HEL Group's principal auditors upon request as to the
                 compliance by HEL Group with such requirements.  For the
                 purposes of this Clause, dividends shall include all
                 distributions and disbursements to third parties or to persons
                 (not being companies within the HEL Group) connected with any
                 company which is a member of the HEL Group from any member of
                 the HEL Group whether by way of dividends on ordinary shares,
                 repurchase of shares, cancellation of shares, management
                 charges and fees or otherwise but, for the avoidance of doubt,
                 shall not include the repayment of bona fide loans and debts.
                 HEL will further procure that all transactions between the HEL
                 Group or any company which is a member thereof with any person
                 connected with the HEL Group or any company which is a member
                 thereof shall be on arm's length terms and for full value;

         3.2.6   itself and will procure that HEL Group (and any company which
                 shall in future become a member of HEL Group) provide cross
                 guarantees in Agreed Form relating to all undertakings,
                 covenants and obligations expressed or intended to be binding
                 upon HEL and the HEL Group under or pursuant to the terms of
                 this agreement and the documents to be entered into pursuant
                 hereto.

3.3      HEL undertakes to Simon, SPT ant SEL to use its best endeavors to
         ensure that not later than 27th November 1994 or such later date as
         Simon may agree it will either:

         3.3.1   procure the giving of a guarantee of all of its obligations to
                 Simon, SPT and SEL as described in this Agreement and in the
                 documents to be entered into pursuant hereto in form and
                 substance satisfactory to and by a bank acceptable to Simon,
                 SPT and SEL as Simon, SPT and SEL shall in their discretion
                 determine; or

         3.3.2   refinance the Vessel entirely in such manner as shall ensure,
                 that neither in relation to the RBS Leases or the RBS Charter
                 nor in respect of any arrangements touching upon or concerning
                 them or the Vessel shall Simon or SPT or SEL or any other
                 company in the Simon Engineering Plc group of companies
                 thereafter have any actual or contingent liability in respect
                 of the Vessel whether as principal or surety or otherwise
                 howsoever provided that in connection with any such
                 refinancing the obligations of Simon and SEL





                                       8
<PAGE>   9
                 pursuant to Clause 4.1 shall be varied and instead of HEL's
                 obligations to pay charterhire to Simon not commencing until
                 the specified aggregate sum has been paid by Simon under the
                 RBS Charter, the obligation of Simon and SEL shall be to pay
                 the balance of such aggregate sum to the provider of the
                 relevant finance to HEL (which shall be applied in or towards
                 discharge of the obligations of HEL in respect of such
                 refinancing), but in any such case Simon and SEL shall not be
                 obliged to pay any moneys in any different amounts or at any
                 different times to the amounts and times which would have
                 applied under the RBS Charter unless Simon and SEL shall
                 otherwise so agree;

         but if unable to complete such arrangements by 27th November 1994 (or
         such later date as may be agreed) as aforesaid it will thereafter
         continue to use its best endeavors to do so as quickly as possible
         until it is able to complete such arrangements.

         Provided that when and if HEL shall complete such arrangements as
         described in 3.3.1 or 3.3.2 above the obligations of HEL pursuant to
         3.2.5 above and Clause 12 of the Charter shall cease thereafter to
         have effect (except, in the latter case, to the extent that any
         consent of the Owner may be required pursuant to the RBS Charter or
         RBS Leases).

4.       Continuing Obligations of Simon

4.1      Each of Simon and SEL undertakes that it will after the Effective Date
         continue to make payments in respect of the obligations of the
         Charterer under the RBS Charter (or, when applicable, make payments
         which would otherwise be for the account of HEL pursuant to any such
         refinancing as is referred to in and in accordance with the provisions
         of 3.3.2 above) as the same shall fall due as shall equal the
         aggregate sum of L.2,336,000 and hereby agrees that provided HEL shall
         not be in breach of any of its obligations to Simon under the Leases
         and/or the Charter HEL's obligation to make payment of charterhire
         under the Charter shall not commence until such time as the aggregate
         amount of payments by Simon to the Owner after the Effective Date
         shall have exceeded, in aggregate, L.2,336,000. The obligation of
         Simon and SEL to pay such aggregate L.2,336,000 sum referred to above
         in respect of charterhire payable after the Effective Date shall be to
         pay such aggregate sum net of all adjustments of rental and cash
         amounts payable as may apply or be payable in relation to the period
         after the Effective Date as a result of any increase or decrease in
         rental payable by Simon by way of adjustment of rental pursuant to
         paragraph 4 of Schedule 3 to the RBS Charter or of any amount payable
         or received by Simon pursuant to paragraph 4 of such Schedule 3.

4.2      HEL agrees that provided Simon shall notify HEL in writing of the
         payment or payments to be made by Simon which will cause such
         aggregate figure to be exceeded HEL will pay direct to the Owner the
         balance of such payment or payments; and HEL





                                       9
<PAGE>   10
         shall thereafter make payments to Simon in full under the Charter
         strictly in accordance with the terms thereof.

4.3      Subject to any necessary consents previously having been obtained from
         the Owner, HEL shall within one month of the Effective Date, and Simon
         shall permit HEL to (and will at HEL's expense take all such steps as
         HEL may reasonably require in connection therewith), change the name
         of the Vessel provided (and HEL hereby agrees) that no future name
         shall without the consent of Simon include "Simon" or otherwise imply
         any continuing relationship with Simon or any company in the Simon
         Engineering plc group of companies. Simon will use all reasonable
         endeavors to procure the consent of the Owner to such change of name.

4.4      If the Owner shall not previously have agreed with Simon and HEL that
         HEL shall have the sole right to exercise the Drop-Lock Option set out
         in Clause 5.3 of Schedule 3 to the RBS Charter and incorporated into
         the RBS Leases by two letters dated 30th April 1992 from the Owner's
         agent (Royal Bank Leasing Limited) countersigned on behalf of Simon on
         13th May 1992 in respect of each such lease Simon agrees that it will
         at the request of HEL exercise such option as soon as reasonably
         possible following HEL's written request to it in respect of the same.

5.       Transfer of Assets

5.1      Property in and the use of assets used on or in connection with the
         Vessel shall be dealt with in accordance with the provisions of this
         Clause 5.

5.2      Excluded Equipment is and will remain the property of Simon, but HEL
         shall be deemed to lease the Excluded Equipment upon the same terms as
         equipment subject to the Leases except that no additional rental shall
         be payable in respect thereof.  When and if any of the Excluded
         Equipment shall become obsolete HEL shall (subject to having
         previously given Simon prior notice in writing thereof so as to permit
         Simon, if it wishes, to remove such equipment) be entitled to dispose
         of the same for scrap or otherwise provided that it shall, where
         appropriate or necessary to comply with its obligations pursuant to
         this Agreement or the Charter, replace such equipment with
         appropriate, up-to-date equipment.  Such replacement equipment shall,
         subject to the terms of this Agreement and the Charter, be and remain
         the property of HEL.  Property in and title to the Excluded Equipment
         shall pass to HEL upon the expiration by affluxion of time of the
         Primary Period under the Charter and the Leases.  Simon shall if
         requested by and at the expense of HEL then execute such bills of sale
         or other documents as HEL may reasonably require to complete or
         evidence such transfer of title.

5.3      Retained Equipment shall be and remain at all times the property of
         Simon and made available to HEL's use upon the terms of such leases or
         licenses as have been or may from time to time be agreed by and
         between Simon and HEL.  Subject to the terms





                                       10
<PAGE>   11
         thereof, Simon shall be entitled to remove or to require the return of
         such equipment at any time and, for the avoidance of doubt, Simon
         shall be entitled to exercise such rights immediately or at any time
         after any "Termination Event" shall have occurred under the Charter or
         either of the Leases.

5.4      HEL represents and warrants that the floating charge created by HEL
         over all of its undertaking, property and assets, present and future,
         in favor of National Westminster Bank plc has not crystallized and
         that nothing, whether contained in the mortgage debenture dated 17th
         December, 1993 creating the same, or otherwise, would cause it to
         crystallize in relation to any Additional Equipment.  HEL shall
         acquire the Additional Equipment in accordance with the terms of
         Clause 3.2 and any equipment so purchased in accordance with Clause
         3.2.1(a) by HEL shall upon acquisition become the property of Simon
         (and HEL shall execute and deliver to Simon such bills of sale and/or
         other documents as Simon may require to effect such transfer of title
         in each case free and clear of any encumbrance).  Any equipment
         acquired pursuant to Clause 3.2.1(a) by means of any leasing
         arrangement as provided for by Clause 3.2 shall immediately upon
         payment out of such lease become the property of Simon (and HEL shall
         execute and deliver to Simon such bills of sale or other documents as
         Simon may require to effect such transfer of title).  Once title to
         Additional Equipment has been transferred to or vested in Simon, such
         equipment shall for the purposes of this Agreement thereafter be
         deemed for all purposes to be Excluded Equipment and subject to the
         provisions of Clause 5.2.

5.5      Equipment which is acquired by or utilised by HEL on the Vessel and
         which is not Excluded Equipment, Retained Equipment or Additional
         Equipment, whether owned by HEL or any party other than HEL, Simon, or
         the Owner, shall (subject to Clause 5.6) remain the property of the
         owner thereof.  Where any such equipment shall not be the property of
         HEL HEL shall at all times ensure that neither it nor any part thereof
         shall become subject to the terms of Clause 5.6.

5.6      Notwithstanding any other provisions of this Agreement or the Charter,
         where any equipment installed or used on the Vessel by HEL would, if
         so installed or used by Simon, become the property of the Owner
         pursuant to the RBS Charter and/or the RBS Leases then such equipment
         shall (unless the prior agreement of the Owner to the contrary shall
         have been obtained) become the property of the Owner as if the
         relevant terms of the RBS Charter and/or the RBS leases applied
         thereto and were set out herein mutatis mutandis so as to bind HEL to
         the terms thereof.

6.       Apportionments

6.1      In lieu of apportionment the expenses and earnings of the Vessel shall
         be dealt with as follows as from the Effective Date:





                                       11
<PAGE>   12
         6.1.1   Subject to 6.1.2, HEL shall be responsible for payment of the
                 following obligations outstanding as at the Effective Date:

                 (i)      all creditors for goods, repairs and services
                          supplied or to be supplied and whether or not
                          invoiced prior to the date of this Agreement; and

                 (ii)     all replacement, repair and servicing of equipment on
                          the Vessel.

         6.1.2   HEL shall not be responsible in relation to the period ended
                 on the Effective Date for payment of the following
                 obligations:

                 (i)      payments due to the Owner pursuant to the RBS Charter
                          and the RBS Leases

                 (ii)     payments due to Ervik whether under or pursuant to
                          the Management Agreement or otherwise

                 (iii)    the sum of L.125,000 due to HEL in respect of overdue
                          creditors and
 
                 (iv)     Taxes relating to the use and operations of the
                          Vessel at any time prior to the Effective Date

         6.1.3   Simon shall pay to HEL on the date of completion (or, if
                 later, the date upon which all necessary consents have been
                 received by Simon in relation to the transactions contemplated
                 hereby) a sum of not more than $100,000 in relation to
                 in-water equipment damaged or lost on 3rd July 1994 in full
                 and final settlement of any claims which HEL might otherwise
                 have against Simon, SPT or SEL in respect thereof

         6.1.4   HEL shall be entitled to all income arising from debtors
                 outstanding at the Effective Date in relation to the
                 acquisition of seismic data, but not income arising from on
                 board processing services, which shall (and shall thereafter
                 continue to) belong to Simon in respect of the client
                 contracted with HEL as at the Effective Date

         6.1.5   Except as otherwise provided in this Clause 6.1 and subject to
                 Clause 4.1, as from the Effective Date all expenses relating
                 to the Vessel and all income derived from its use shall be for
                 the account of HEL.

6.2      Notwithstanding that delivery thereof pursuant to the terms of the
         Charter and the Leases respectively shall occur after the date of this
         Agreement, on and after the date of this Agreement all risk of loss of
         or damage to the Vessel or the goods subject to the Leases shall as
         between Simon and HEL pass to HEL with effect from the Effective Date.





                                       12
<PAGE>   13
7.       Completion

         Completion shall take place at the offices of Simmons & Simmons, 14
         Dominion Street, EC2 at midday on 15th July 1994 when all of the
         documents referred to herein and as conditions precedent to the
         Charter and the Master Lease shall be delivered and shall become
         binding upon the parties thereto subject only to the obtaining by
         Simon, SPT and SEL of the relevant consents of the Owner and their
         other financiers in form and substance satisfactory to them.  Simon
         shall notify HEL forthwith of receipt of such consents and upon the
         giving of such notice all of the terms of this Agreement and the
         transactions and documents referred to herein shall become effective
         and be implemented as envisaged hereby and the Vessel and the
         equipment subject to the Leases shall be delivered to and accepted by
         HEL.  Simon and HEL shall sign date and deliver a protocol of delivery
         and acceptance in Agreed Form to confirm delivery and acceptance of
         the Vessel.  Simon and HEL shall use all reasonable endeavors to
         obtain the consent of the Owner (including confirmation in terms
         reasonably acceptable to Simon and HEL of the Owner's requirements
         regarding the insurances of the Vessel) within 14 days after the date
         of this Agreement and Simon and SEL shall use all reasonable endeavors
         to obtain the consent of certain US Noteholders within 28 days after
         the date of this Agreement.  If all such consents have not been
         received within 28 days after the date of this Agreement the parties
         shall endeavor to agree an appropriate extension of such period but in
         the absence of such agreement this Agreement shall be deemed to be of
         no further effect.

8.       Costs

         Each party to this agreement shall be responsible for its own costs
         and expenses (including legal fees) incurred in connection with the
         negotiation, preparation and execution of this agreement and in the
         completion of the transactions contemplated hereby.

9.       Announcements

         No announcement about this Agreement or any part of its subject-matter
         shall be made unless agreed by all parties hereto or as required by
         law or applicable regulations (including any relevant Stock Exchange
         regulations) and the matters herein shall be kept strictly
         confidential.

10.      Assignment

10.1     The HEL Documents shall benefit and be binding on the parties, their
         respective successors and any permitted assignee or transferee of some
         or all of a party's rights or obligations thereunder.  Any reference
         in the HEL Documents to any party shall be construed accordingly.





                                       13
<PAGE>   14
10.2     Neither HEL nor any member of the HEL Group may assign, transfer or
         otherwise dispose of all or part of its rights or obligations under
         the HEL Documents.

10.3     Simon, SPT and SEL or any of them may at any time transfer all or any
         part of its rights, benefits and obligations under the HEL Documents
         by assigning to any other of them or to any third party (each of which
         is hereinafter in this Clause called an "Assignee") which is not a
         Business Competitor of HEL all or any part of its respective rights
         and benefits hereunder in consideration of the agreement of each such
         Assignee to perform, or to reimburse the assignor for having
         performed, the assignor's obligations thereunder as so assigned to
         such Assignee.  If any such third party is a Business Competitor of
         HEL Simon, SPT and SEL shall not, without the prior written consent of
         HEL (such consent not to be unreasonably withheld or delayed) so
         transfer all or any part of its respective rights, benefits and
         obligations. If any of Simon, SPT and/or SEL does so transfer its
         rights, benefits and obligations in accordance with the provisions of
         this Clause 10, all references in the HEL Documents to it shall
         thereafter be construed as a reference to the Assignee.

10.4     Simon, SPT and SEL may not disclose to a potential assignee or any
         other person proposing to enter into contractual arrangements with it
         in relation to the HEL Documents information about the HEL Group, the
         Vessel and the HEL Documents except with the prior written consent of
         HEL (such consent not to be unreasonably withheld or delayed).

11.      Notices

         All notices, demands or other communications under or in connection
         with this Agreement shall be sent by letter, telefax or telex:

         (a)     if to Simon or SPT
                 Horizon House
                 Azalea Drive
                 Swanley
                 Kent TN13 1XR
                 Attn: Company Secretary

                 Telex No: 896050 EXPLOR G
                 Fax No: 0322 613650

         with copy to:

                 Simon Engineering Plc
                 Simon House
                 Bird Hall Lane
                 Stockport





                                       14
<PAGE>   15
                 Cheshire
                 SK3 ORT
                 Attn: Company Secretary

                 Telex No: 665923 SIMENG G
                 Fax No: 061 491 2472

         (b)     if to HEL
                 6 Pembroke Road
                 Sevenoaks
                 Kent TN1 1XR
                 Attn: Company Secretary
                 Telex No: 957840 EXPLOR G
                 Fax No: 0732 742977

                 or to such other address or telex number as such party may
                 from time to time notify to the other parties hereto.

12.      Law and Jurisdiction

12.1     This agreement shall be governed by and construed in accordance with
         English law.

12.2     Any dispute or difference hereunder shall be referred to the exclusive
         jurisdiction of the English courts.


IN WITNESS whereof this Agreement has been executed by the parties hereto the
day and year first above written.

SIMON HORIZON LIMITED


By:  /s/ [illegible signature]


SIMON PETROLEUM TECHNOLOGY LIMITED


By:  /s/ [illegible signature]


SIMON ENGINEERING plc

By:  /s/ [illegible signature]





                                       15
<PAGE>   16

HORIZON EXPLORATION LIMITED


By:  /s/ [illegible signature]





                                       16
<PAGE>   17
                                   ANNEX - 1

                         [Insurance Deductibles Letter]





                                       17

<PAGE>   1
                                                                         10.9.10


                           Dated 20th December, 1990


                             ROYAL BANK OF SCOTLAND
                          (INDUSTRIAL LEASING) LIMITED
                                      and
                             SIMON-HORIZON LIMITED


                         CHARTERPARTY BY WAY OF DEMISE
                      in respect of m.v. "SEAWAY LABRADOR"
                                 and Equipment
<PAGE>   2
                                     INDEX


<TABLE>
<CAPTION>
Clause                               Heading                                Page
- ------                               -------                                ----
<S>      <C>                                                                  <C>

1        Definitions  . . . . . . . . . . . . . . . . . . . . . . . . . . .    1

2        Representations and Warranties . . . . . . . . . . . . . . . . . .    9

3        Term of Charter  . . . . . . . . . . . . . . . . . . . . . . . . .   11

4        Conditions Precedent . . . . . . . . . . . . . . . . . . . . . . .   13

5        Delivery and Acceptance  . . . . . . . . . . . . . . . . . . . . .   14

6        Extent of Owner's Liability; Third Party Warranties  . . . . . . .   16

7        Charterhire  . . . . . . . . . . . . . . . . . . . . . . . . . . .   17

8        Payments, Interest and Calculations  . . . . . . . . . . . . . . .   18

9        Costs and Indemnities  . . . . . . . . . . . . . . . . . . . . . .   19

10       Taxation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   21

11       General Undertakings . . . . . . . . . . . . . . . . . . . . . . .   23
         11.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   23
                 (a)      Notification of Relevant Event  . . . . . . . . .   24
                 (b)      Consents and Authorisations . . . . . . . . . . .   24
                 (c)      Preparation of Accounts . . . . . . . . . . . . .   24
                 (d)      Supply of Accounts  . . . . . . . . . . . . . . .   24
                 (e)      Information concerning the Charterer  . . . . . .   24
                 (f)      Information concerning the Ship . . . . . . . . .   24
                 (g)      Observance of Covenants . . . . . . . . . . . . .   25
         11.2    Protection of Owner's Rights . . . . . . . . . . . . . . .   25
                 (a)      Disposal of the Ship  . . . . . . . . . . . . . .   25
                 (b)      Encumbrances  . . . . . . . . . . . . . . . . . .   25
                 (c)      Notification of Arrest  . . . . . . . . . . . . .   25
                 (d)      Prevention of and Release from Arrest . . . . . .   25
                 (e)      No pledging of Owner's Credit . . . . . . . . . .   26
                 (f)      Protection of Owner's Rights in the Ship  . . . .   26
                 (g)      Notice of Owner's Rights  . . . . . . . . . . . .   26
</TABLE>





                                       i
<PAGE>   3
<TABLE>
<S>      <C>                                                                  <C>
                 (h)      Release from Arrest Owner's Vessels . . . . . . .   27

12       Sub Chartering . . . . . . . . . . . . . . . . . . . . . . . . . .   27

13       Use and Trade of the Ship  . . . . . . . . . . . . . . . . . . . .   28
         13.1    Permitted Use  . . . . . . . . . . . . . . . . . . . . . .   28
         13.2     . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   28
                 (a)      Ship's Registration . . . . . . . . . . . . . . .   28
                 (b)      Employment  . . . . . . . . . . . . . . . . . . .   28
                 (c)      Payment of Outgoings and Evidence of
                          Payments  . . . . . . . . . . . . . . . . . . . .   29
                 (d)      Operation in the U.S.A. or Canada . . . . . . . .   29
                 (e)      Use for a Qualifying Purpose  . . . . . . . . . .   29
                 (f)      Bills of Lading . . . . . . . . . . . . . . . . .   30

14       Title, Registration, Name and House Flag . . . . . . . . . . . . .   30
         14.1    Title  . . . . . . . . . . . . . . . . . . . . . . . . . .   30
         14.2    Initial Registration . . . . . . . . . . . . . . . . . . .   30
         14.3    Transfer of Flag or Registry . . . . . . . . . . . . . . .   30
         14.4    Name and House Flag  . . . . . . . . . . . . . . . . . . .   31

15       Maintenance and Operation  . . . . . . . . . . . . . . . . . . . .   31
         15.1    Possession and Control of Ship by Charterer  . . . . . . .   31
         15.2    Undertakings concerning Maintenance and Operation  . . . .   32
                 (a)      Maintenance of Classification;
                          Compliance with Regulations . . . . . . . . . . .   32
                 (b)      Supply and Crewing  . . . . . . . . . . . . . . .   32
                 (c)      Surveys . . . . . . . . . . . . . . . . . . . . .   32
                 (d)      Repair  . . . . . . . . . . . . . . . . . . . . .   32
                 (e)      Drydocking  . . . . . . . . . . . . . . . . . . .   33
                 (f)      Inspection of the Ship  . . . . . . . . . . . . .   33
                 (g)      Manuals and Technical Records . . . . . . . . . .   33
                 (h)      Modification; Removal of Parts;
                          Equipment owned by Third Parties  . . . . . . . .   33
                 (i)      Manager . . . . . . . . . . . . . . . . . . . . .   34
                 (j)      Notification of certain Events  . . . . . . . . .   34
                 (k)      Repairers' Liens  . . . . . . . . . . . . . . . .   35
                 (l)      Health and Safety . . . . . . . . . . . . . . . .   35
                 (m)      No Operational Interest . . . . . . . . . . . . .   35
                 (n)      Safe Operation  . . . . . . . . . . . . . . . . .   36
                 (o)      Fitness to go to Sea  . . . . . . . . . . . . . .   36

16       Insurance Undertakings; Wreck Removal and Insurance Assignment . .   36
         16.1    Insurance Undertakings . . . . . . . . . . . . . . . . . .   36
                 (a)      Insured Risks . . . . . . . . . . . . . . . . . .   36
</TABLE>





                                       ii
<PAGE>   4
<TABLE>
<S>      <C>                                                                  <C>
                 (b)      Brokers and Insurers  . . . . . . . . . . . . . .   37
                 (c)      Fleet Cover . . . . . . . . . . . . . . . . . . .   37
                 (d)      Payment of Premiums . . . . . . . . . . . . . . .   37
                 (e)      Renewal . . . . . . . . . . . . . . . . . . . . .   37
                 (f)      Guarantees  . . . . . . . . . . . . . . . . . . .   38
                 (g)      Custody of Policy Documents; Letters
                          of Undertaking; Loss Payable Clauses  . . . . . .   38
                 (h)      Club Letters of Undertaking; Certificates of
                          Entry . . . . . . . . . . . . . . . . . . . . . .   38
                 (i)      Broker's Report . . . . . . . . . . . . . . . . .   38
                 (j)      Collection  . . . . . . . . . . . . . . . . . . .   39
                 (k)      Compliance with Insurances  . . . . . . . . . . .   39
                 (l)      Application of Recoveries . . . . . . . . . . . .   39
                 (m)      Other Insurances and Assureds . . . . . . . . . .   39
                 (n)      Information concerning Insurances . . . . . . . .   40
         16.2    Wreck Removal  . . . . . . . . . . . . . . . . . . . . . .   40
         16.3    Further Requirements . . . . . . . . . . . . . . . . . . .   40
         16.4    Insurance Assignment . . . . . . . . . . . . . . . . . . .   40

17       Powers of Owner to Remedy Defaults . . . . . . . . . . . . . . . .   41
         17.1    Failure to Perform Insurance Undertakings  . . . . . . . .   41
         17.2    Failure to Perform Maintenance Undertakings  . . . . . . .   41
         17.3    Failure to Prevent or Release from Arrest  . . . . . . . .   41
         17.4    Failure to comply with other Obligations . . . . . . . . .   41
         17.5    Costs of Remedying Defaults  . . . . . . . . . . . . . . .   42
         17.6    Hire Still Payable . . . . . . . . . . . . . . . . . . . .   42

18       Redelivery . . . . . . . . . . . . . . . . . . . . . . . . . . . .   42
         18.1    Redelivery Procedure and Condition . . . . . . . . . . . .   42
         18.2    Redelivery Survey  . . . . . . . . . . . . . . . . . . . .   42

19       Consumable Stores  . . . . . . . . . . . . . . . . . . . . . . . .   43
         19.1    Upon Delivery  . . . . . . . . . . . . . . . . . . . . . .   43
         19.2    Upon Redelivery  . . . . . . . . . . . . . . . . . . . . .   43

20       Use of Equipment and Replacement . . . . . . . . . . . . . . . . .   43
         20.1    Use of Equipment and Manuals and Technical Records . . . .   43
         20.2    Renewal of Equipment . . . . . . . . . . . . . . . . . . .   43
         20.3    Alteration of Equipment; Additional Equipment  . . . . . .   44

21       Loss and Damage  . . . . . . . . . . . . . . . . . . . . . . . . .   44

22       Salvage  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   47

23       Requisition  . . . . . . . . . . . . . . . . . . . . . . . . . . .   47
</TABLE>





                                      iii
<PAGE>   5
<TABLE>
<S>      <C>                                                                  <C>
24       Termination Events . . . . . . . . . . . . . . . . . . . . . . . .   49

25       Owners Rights Following a Termination Event  . . . . . . . . . . .   52

26       Increased Costs, Funding Problems and Illegality . . . . . . . . .   53

27       Notices  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   54

28       Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . .   55

29       Miscellaneous  . . . . . . . . . . . . . . . . . . . . . . . . . .   56

30       Law  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   57
</TABLE>





                                       iv
<PAGE>   6
<TABLE>
<S>                                                                           <C>
SCHEDULE 1  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   58
         List of Documents and Evidence . . . . . . . . . . . . . . . . . .   58

SCHEDULE 2  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   60
         Form of Delivery Notice  . . . . . . . . . . . . . . . . . . . . .   60

SCHEDULE 3  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   61
         Charterhire  . . . . . . . . . . . . . . . . . . . . . . . . . . .   61

SCHEDULE 4  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   77
         Temination Sum . . . . . . . . . . . . . . . . . . . . . . . . . .   77

SCHEDULE 5  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   82
         Forms of Loss Payable Clauses  . . . . . . . . . . . . . . . . . .   82

SCHEDULE 6  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   83
         List of Excluded Equipment . . . . . . . . . . . . . . . . . . . .   83
</TABLE>





                                       v
<PAGE>   7
A CHARTERPARTY BY WAY OF DEMISE dated 20th December, 1990, and made BETWEEN:

(1)      ROYAL BANK OF SCOTLAND (INDUSTRIAL LEASING) LIMITED whose registered
         office is at 42 St. Andrew Square, Edinburgh EH2 2YE, Scotland (the
         "Owner"); and

(2)      SIMON-HORIZON LIMITED whose registered office is at Horizon House,
         Azalea Drive, Swanley, Kent BR8 8JR (the "Charterer")

BY WHICH IT IS AGREED as follows:

1        DEFINITIONS

1.1      In this Charterparty, unless the context otherwise requires:

         "Approved Brokers" means such firm of insurance brokers appointed by
         the Charterer, as may from time to time be approved in writing by or
         on behalf of the Owner for the purposes of this Charterparty;

         "Banking Day" means a day (other than a Saturday) on which banks are
         open for business in London and Edinburgh;

         "BFE" means the equipment, machinery and parts to be supplied by the
         Charterer to the Owner pursuant to the Conversion and Supply
         Agreement;

         "CAA" means the Capital Allowances Act 1990;

         "Casualty Amount" means Two hundred and fifty thousand Pounds
         (L.250,000) (or the equivalent in any other currency);

         "Charterhire Payment Dates" means, subject to Clause 8.2, in relation
         to the Primary Period, each of the dates referred to in paragraph 2.2
         of Schedule 3 and, in relation to the Secondary Period, means each of
         the dates referred to in paragraph 6.2 of Schedule 3;

         "Charter Period" means the period during which the Charterer shall be
         entitled to the possession and use of the Ship in accordance with this
         Charterparty;

         "Charterer" means Simon-Horizon limited of Horizon House, Azalea
         Drive, Swanley, Kent BR8 8JR and includes its successors and permitted
         assignees and transferees;

         "Classification" means "DNV + Al (MV), EO, SF, Supply Vessel Helideck"
         with the Classification Society or such other classification as the
         Owner shall, at the request of





                                       1
<PAGE>   8
         the Charterer, have agreed in writing shall be treated as the
         Classification for the purposes of this Charterparty;

         "Classification Society" means Det Norske Veritas or such other
         classification society which the Owner shall at the request of the
         Charterer, have agreed in writing shall be treated as the
         Classification Society for the purposes of this Charterparty;

         "Compulsory Acquisition" means requisition of title or other
         compulsory acquisition, requisition, appropriation expropriation,
         deprivation or confiscation for any reason of the Ship by any
         Government Entity or other competent authority, whether de jure or de
         facto, but shall exclude requisition for use or hire not involving
         requisition of title;

         "Conversion and Supply Agreements" means an agreement of even date
         herewith between the Owner and the Charterer with regard to the Ship
         and relating to certain conversion works to be carried out to the Ship
         and the purchase of certain equipment to be installed thereon;

         "Conversion and Supply Price" means the aggregate amount in Pounds of
         the payments made to the Charterer pursuant to certificates presented
         under Clauses 2.5 and 3.4 of the Conversion and Supply Agreement;

         "Corporation Tax" means corporation tax in the context of the scheme
         of taxation contained in the United Kingdom Tax Acts (as defined in
         section 831 ICTA) and any applicable Finance Act or any other tax on
         companies imposed in the United Kingdom in substitution for
         corporation tax;

         "Delivery" means the time when the Owner shall accept, and obtain
         title to, the Ship under the Purchase Agreement;

         "Delivery Date" means the date on which Delivery shall occur;

         "Encumbrance" means any mortgage, charge (whether fixed or floating),
         pledge, lien, hypothecation, assignment, security interest, title
         retention or other encumbrance of any kind securing, or any right
         conferring a priority of payment in respect of, any obligation of any
         person;

         "Expected Delivery Date" means the date specified in the notice to be
         given by the Charterer to the Owner pursuant to Clause 5.2 as being
         the date upon which it is expected that the Charterer will deliver the
         Ship to the Owner pursuant to the Purchase Agreement;

         "Excluded Equipment" means the equipment, machinery and parts owned by
         or leased to the Charterer listed in Schedule 6 which although
         installed or to be installed on the





                                       2
<PAGE>   9
         Ship by the Start Date are not chartered by the Owner to the Charterer
         pursuant to this Charterparty;

         "Government Entity" means and includes (whether having a distinct
         legal personality or not) any national or local government authority,
         board, commission, department, division, organ, instrumentality, court
         or agency and any association, organisation or institution of which
         any of the foregoing is a member or to whose jurisdiction any of the
         foregoing is subject or in whose activities any of the foregoing is a
         participant;

         "Guarantee" means the guarantee issued or, as the context may require,
         to be issued by the Guarantor in favour of the Owner;

         "Guarantor" means Simon Engineering plc whose registered office is at
         Simon House, Bird Hall Lane, Stockport, Cheshire SK3 0RJ;

         "ICTA" means the Income and Corporation Taxes Act 1988;

         "Indebtedness" means any obligation for the payment or repayment of
         money, whether as principal or as surety, and whether present or
         future, actual or contingent;

         "Insurances" means all policies and contracts of insurance (which
         expression includes all entries of the Ship in a protection and
         indemnity or war risks association) which are from time to time during
         the Charter Period in place or taken out or entered into by the
         Charterer pursuant to Clause 16 for the benefit of itself and the
         Owner in respect of the Ship or otherwise howsoever in connection with
         the Ship and all benefits thereof (including claims of whatsoever
         nature and return of premiums);

         "Loss Payable Clauses" means the provisions regulating the manner of
         payment of sums receivable under the Insurances which are to be
         incorporated in the relevant insurance documents, such Loss Payable
         Clauses to be in the forms set out in Schedule 5 or in such other
         forms as may from time to time be agreed in writing by the Owner;

         "Manager" means Ervik Marine Services A/S of Brunholmgt 2, N6004
         Aalesund, Norway or any other person appointed by the Charterer, with
         the prior written consent of the Owner, as the manager of the Ship;

         "Management Agreement" means the agreement approved by the Owner dated
         19th December, 1990 and made between the Charterer and the Manager or
         any other agreement, previously agreed in writing by the Owner,
         between the Charterer and the Manager providing (inter alia) for the
         Manager to manage the Ship;

         "Manuals and Technical Records" means all such books, records, logs,
         manuals, technical data, drawings and other materials and documents
         (whether kept or to be kept





                                       3
<PAGE>   10
         in compliance with any applicable laws or the requirements of the
         Classification Society or otherwise) relating to the Ship;

         "Month" means a period beginning in one calendar month and ending in
         the next calendar month on the day numerically corresponding to the
         day of the calendar month on which it started, provided that (i) if
         the period started on the last Banking Day in a calendar month or if
         there is no such numerically corresponding day, it shall end on the
         last Banking Day in such next calendar month and (ii) if such
         numerically corresponding day is not a Banking Day, the period shall
         end on the preceding Banking Day and "months" and "monthly" shall be
         construed accordingly;

         "MWB Conversion Contract" means the agreement dated 18th October, 1990
         and made between the Charterer and the Yard relating to certain
         conversion works to be carried out, and for the supply of certain
         equipment, so the Ship;

         "Net Sale Proceeds" means, in relation to a sale of the Ship, the
         amount actually received by the Owner from a purchaser of the Ship
         after deducting the Owners expenses in connection with such sale
         including without limitation (where applicable) broker's commissions,
         Owner's marketing expenses, legal costs, agency fees and port charges,
         insurance premiums, stamp duties, registration fees and any expenses
         relating to the overhaul or repair of the Ship (including putting the
         Ship in class) incurred to restore the Ship to the condition required
         by this Charterparty or pursuant to the provisions of any sale and
         purchase agreement in respect of the sale of the Ship;

         "Original Cost" means an amount equal to the aggregate of

                 (i)      the Purchase Price; and

                 (ii)     the Conversion and Supply Price;

         "Owner" includes successors and assignees of the Owner;

         "Permitted Encumbrance" means in respect of the Ship:

         (a)     any Encumbrance arising from the Owner's own acts or defaults;

         (b)     any Encumbrance for Taxes either not yet assessed or, if
                 assessed, not yet due and payable or being contested in good
                 faith by appropriate proceedings (and for the payment of which
                 adequate reserves have been provided) so long as any such
                 proceedings or the continued existence of such Encumbrance do
                 not involve any likelihood of the sale, forfeiture or loss of,
                 or of any interest in, the Ship;

         (c)     liens arising in the ordinary course of business by statute or
                 by operation of law in respect of obligations which are not
                 overdue or which are being contested in





                                       4
<PAGE>   11
                 good faith by appropriate proceedings (and for the payment of
                 which adequate reserves have been provided) so long as any
                 such proceedings or the continued existence of such liens do
                 not involve any likelihood of the sale, forfeiture or loss of,
                 or of any interest in, the Ship;

         (d)     any lien for General Average or for Master's, officer's or
                 crew's wages outstanding in the ordinary course of trading,
                 any lien for salvage and any ship repairer's or outfitters'
                 possessory lien for a sum not exceeding the Casualty Amount;
                 and

         (e)     during the period of the conversion of the Ship pursuant to
                 the MWB Conversion Contract, any lien or right of the Yard to
                 retain the Ship to the extent that it arises as a result of,
                 or is provided for in, the MWB Conversion Contract and does
                 not become exercisable by reason of a default by the Charterer
                 in its performance of its obligations under the MWB Conversion
                 Contract;

         "Pounds" and the sign "L." means pounds sterling of the United
         Kingdom;

         "Pre-Primary Period" means the period commencing on the Delivery Date
         and terminating, subject to the terms and conditions of this
         Charterparty, on the Start Date;

         "Primary Period" means the period commencing on the Start Date and
         terminating, subject to the terms and conditions of this Charterparty,
         on 1st April, 2001;

         "Purchase Agreement" means the Memorandum of Agreement dated December,
         1990 and made between the Charterer and the Owner under which the
         Charterer is to sell and the Owner is to purchase the Ship;

         "Purchase Price" means the sum of Five million five hundred thousand
         Pounds (L.5,500,000) payable by the Owner to the Charterer for the
         Ship under the Purchase Contract;

         "Relevant Documents" means this Charterparty, the Conversion and
         Supply Agreement, the Guarantee and any other document or instrument
         from time to time executed as a guarantee and/or security for the
         obligations of the Charterer and/or any sums of money from time to
         time owing, whether actually or contingently, under or pursuant to
         this Charterparty and all notices, consents, certificates and other
         documents and agreements issued or, as the case may be, to be issued
         pursuant to any of the foregoing, and until expiry of the warranties
         given to the Charterer pursuant to the MWB Conversion Contract,
         includes the MWB Conversion Contract;

         "Relevant Event" means any Termination Event or any event which with
         the giving of notice or lapse of time or the satisfaction of any other
         condition (or any combination thereof) would constitute a Termination
         Event;





                                       5
<PAGE>   12
         "Relevant Party" means all or any one of the Charterer, the Guarantor
         or any other party (other than the Owner) to any of the Relevant
         Documents;

         "Relevant Rate of Interest" means the rate of interest determined by
         the Owner to be Two percent (2%) per annum above the base rate of The
         Royal Bank of Scotland plc;

         "Requisition Compensation" means all moneys or other compensation from
         time to time payable in respect of the Compulsory Acquisition of the
         Ship;

         "Secondary Period" means the period for which the Charter Period is
         extended or further extended in accordance with Clause 3.2;

         "Ship" means the m.v. "Seaway Labrador" to be purchased by the Owner
         pursuant to the Purchase Contract presently registered under the
         Bahamian flag at the Port of Nassau with Official Number 715224 and
         includes any share or interest therein and her engines, machinery,
         boats, tackle, outfit, equipment, compressors, computers, seismic
         survey equipment, spare gear, fuel consumables or other stores
         belongings and appurtenances whether on board or ashore (but excluding
         Excluded Equipment, consumable stores and provisions, bunkers,
         domestic fuel lubricants, rented equipment, and charterer's additions
         as contemplated in Clause 20.3) which become the property of the Owner
         pursuant to the Purchase Contract and the Conversion and Supply
         Agreement and belong to the Owner as at Delivery or installed on the
         Ship thereafter or which, having been removed therefrom remain the
         property of the Owner pursuant to this Charterparty together with any
         and all substitutions therefor and replacements and renewals thereof
         from time to time made in or to her in accordance with the provisions
         of this Charterparty and, where the context permits, "Ship" shall
         include the Manuals and Technical Records;

         "Start Date" means 31st March, 1991;

         "Subsidiary" of a person means any company or entity directly or
         indirectly controlled by such person for which purpose "control" means
         either ownership of more than 50 per cent of the voting share capital
         (or equivalent right of ownership) of such company or entity, or power
         to direct its policies and management whether by contract or
         otherwise;

         "Taxes" includes all present and future taxes, levies, imposts,
         duties, fees or charges of whatever nature, including, without
         limitation, corporation, capital gains, income, gross receipts
         franchise, transfer, sales, use, business, occupation, transaction,
         purchase, value added, excise, personal property, real property,
         stamp, documentary, national insurance, or similar taxes at the rate
         applicable for the time being, imposed by any national or local taxing
         authority or any other agency or government, together with interest
         thereon and penalties in respect thereof and "Taxation" shall be
         construed accordingly;

         "Termination Event" means any of the events or circumstances described
         in Clause 24;





                                       6
<PAGE>   13
         "Termination Sum" means at any relevant time the amount calculated in
         accordance with Schedule 4 as being applicable at such time;

         "Total Loss" means any of the following events:

         i)      the actual or constructive total loss of the Ship (including
                 any damage to the Ship which results in an insurance
                 settlement on the basis of a total loss, or requisition for
                 use or hire of the Ship which results in an insurance
                 settlement on the basis of a total loss);

         ii)     the Compulsory Acquisition of the Ship; or

         iii)    the hijacking, theft, condemnation, confiscation, arrest,
                 capture, detention, seizure or requisition for use or hire of
                 the Ship (other than where the same amounts to Compulsory
                 Acquisition of the Ship) unless the Ship be released and
                 restored to the Charterer from such hijacking, theft,
                 condemnation, confiscation,, arrest, capture, detention,
                 seizure or requisition for use or hire within thirty (30) days
                 after the occurrence thereof,

         "Total Loss Date" shall have the meaning ascribed thereto in Clause
         21.2(b);

         "Value Added Tax" or "VAT" means value added tax as provided for in
         the Value Added Tax Act 1983 or any similar tax replacing or
         introduced in addition to the same;

         "Yard" means Motorenwerk Bremerhaven GmbH of Barkhausenstrasse, D-2850
         Bremerhaven, Federal Republic of Germany.

1.2      Insurance Definitions

         In Clause 16:

         (i)     "excess risks" means the proportion (if any) of claims for
                 general average, salvage and salvage charges and under the
                 ordinary collision clause not recoverable in consequence of
                 the value at which a vessel is assessed for the purpose of
                 such claims exceeding her insured value;

         (ii)    "fire and usual marine risks" means hull and machinery
                 coverage in accordance with Institute Time Clauses Hulls
                 including Institute Additional Perils Clause or equivalent
                 thereof;

         (iii)   "protection and indemnity risks" means the usual risks covered
                 by an English protection and indemnity association including
                 the proportion (if any) not recoverable in case of collision
                 under the ordinary collision clause; and





                                       7
<PAGE>   14
         (iv)    "war risks" includes the risk of mines and all risks excluded
                 from the standard form of English marine policy by the free of
                 capture and seizure clause.

1.3      Clause headings and the Index are inserted for convenience of
         reference only and shall be ignored in the interpretation of this
         Charterparty.

1.4      In this Charterparty, unless the contact otherwise requires:

         (a)     references to Clauses and Schedules are to be construed as
                 references to the clauses of, and schedules to, this
                 Charterparty and references to this Charterparty include its
                 Schedules;

         (b)     references to (or to any specified provision of) this
                 Charterparty or any other document shall be construed as
                 references to this Charterparty, that provision or that
                 document as in force for the time being and as amended in
                 accordance with the terms thereof, or as the case may be, with
                 the agreement of the relevant parties and (where such consent
                 is, by the terms of this Charterparty or the relevant document
                 required to be obtained as a condition to such amendment being
                 permitted) the prior written consent of the Owner;

         (c)     words importing the plural shall include the singular and vice
                 versa;

         (d)     references to a person shall be construed as including,
                 without limitation, references to an individual, firm,
                 company, corporation, unincorporated body of persons and any
                 Government Entity, and

         (e)     without prejudice to any provisions in this Charterparty
                 providing for payments to be made or for adjustments to be
                 made to amounts payable hereunder in the event of a change in
                 any statute or statutory provisions references to statutory
                 provisions shall be construed as references to those
                 provisions as respectively amended or re-enacted (whether
                 before or after the date hereof) from time to time and shall
                 include any provisions of which they are re-enactments
                 (whether with or without modification) and any subordinate
                 legislation made under such provisions so far as such
                 modification or re-enactment applies or is capable of applying
                 to any transactions entered into prior to the date hereof and
                 (so far as liability thereunder may exist or can arise) shall
                 include also any past statutory provisions or regulations (as
                 from time to time modified or re-enacted) which such
                 provisions or regulations have directly or indirectly
                 replaced.





                                       8
<PAGE>   15
2        REPRESENTATIONS AND WARRANTIES

2.1      The Charterer represents and warrants to the Owner that:

         (a)     the Charterer is duly incorporated and validly existing under
                 the laws of England as a limited liability company and has
                 power to carry on its business as it is now being conducted
                 and to own its property and other assets;

         (b)     the Charterer has the power to execute, deliver and perform
                 its obligations under the Relevant Documents to which it is a
                 party and all necessary corporate, shareholder and other
                 action has been taken to authorise the execution, delivery and
                 performance of the same;

         (c)     the Relevant Documents to which the Charterer is a party,
                 constitute or will upon execution thereof, constitute valid
                 and legally binding obligations of the Charterer enforceable
                 in accordance with their respective terms;

         (d)     the execution and delivery of, the performance of its
                 obligations under, and compliance with the provisions of, the
                 Relevant Documents to which it is a party by the Charterer
                 will not (i) contravene any existing applicable law, statute,
                 rule or regulation, or any judgment, decree or permit to which
                 the Charterer is subject (ii) conflict with, or result in any
                 breach of any of the terms of, or constitute a default under,
                 any agreement or other instrument to which the Charterer is a
                 party or is subject or by which it or any of its property is
                 bound, (iii) contravene or conflict with any provision of the
                 Charterer's Memorandum and Articles of Association;

         (e)     no litigation, arbitration or administrative proceeding is
                 taking place, pending or, to the knowledge of the officers of
                 the Charterer, threatened against the Charterer which has not
                 been notified to the Owner in writing and which is neither
                 frivolous nor vexatious and could have a material adverse
                 effect on the business, assets or financial condition of the
                 Charterer or its ability to perform its obligations under the
                 Relevant Documents and such proceedings remain unstayed or
                 unresolved for a period exceeding thirty (30) days unless
                 contested by the Charterer in good faith;

         (f)     the audited financial statements of the Charterer in respect
                 of the financial year ended on 31st December, 1989 as
                 delivered to the Owner have been prepared in accordance with
                 generally accepted accounting principles and practices in the
                 United Kingdom which have been consistently applied and
                 present fairly and accurately the financial position of the
                 Charterer as at such date and the results of the operations of
                 the Charterer for the financial year ended on such date, and
                 as at such date the Charterer did not have any significant
                 liabilities (contingent or





                                       9
<PAGE>   16
                 otherwise) which are not disclosed by, or reserved against in,
                 such financial statements and the Charterer did not have any
                 unrealised or anticipated losses.

2.2      The Charterer further represents and warrants to the Owner that:

         (a)     there has been no material adverse change in the financial
                 position of the Charterer from that set forth in the financial
                 statements referred to in Clause 2.1 (f);

         (b)     every consent, authorisation, license or approval of, or
                 registration with, or declaration to, governmental or public
                 bodies or authorities or courts required by the Charterer to
                 authorise, or required by the Charterer in connection with the
                 execution, delivery, validity, enforceability or admissibility
                 in evidence of the Relevant Documents, or the performance by
                 the Charterer of its obligations under the Relevant Documents
                 has been obtained or made and is in full force and effect, and
                 there has been no default in the observance of the conditions
                 or restrictions (if any) imposed in, or in connection with,
                 any of the same;

         (c)     the obligations of the Charterer under the Relevant Documents
                 are direct, general and unconditional obligations of the
                 Charterer and rank at least pari passu with all other present
                 and future unsecured and unsubordinated obligations (including
                 contingent obligations) of the Charterer with the exception of
                 such obligations as are mandatorily preferred by law and not
                 by contract;

         (d)     the Charterer is not (nor would with the giving of notice or
                 lapse of time or both be) in breach of or in default under any
                 agreement relating to Indebtedness to which it is a party or
                 by which it may be bound;

         (e)     the information, exhibits and reports furnished by the
                 Charterer to the Owner in connection herewith or with the
                 negotiation and preparation of this Charterparty are true and
                 accurate in all material respects and not misleading, do not
                 omit material facts and all reasonable enquiries have been
                 made to verify the facts and statements contained therein;
                 there are no other facts the omission of which would make any
                 fact or statement therein misleading,

         (f)     no Relevant Event has occurred and is continuing,

         (g)     the Ship is and will on Delivery be free from all Encumbrances
                 other than Permitted Encumbrances; and

         (h)     neither the Charterer's interest in the Insurances or any
                 Requisition Compensation nor any part thereof will on Delivery
                 be subject to any Encumbrances save for any Permitted
                 Encumbrance.





                                       10
<PAGE>   17
2.3      The representations and warranties in Clause 2.1 (and so that the
         representation and warranty in Clauses 2.1(f) shall for this purpose
         refer to the then latest audited financial statements delivered to the
         Owner under Clause 11.1(d)) shall be deemed to be repeated by the
         Charterer on and as of each day from the date of this Charterparty
         until the end of the Charter Period as if made with reference to the
         facts and circumstances existing on each such date.

2.4      The rights and remedies of the Owner in relation to any
         misrepresentation or breach of warranty on the part of the Charterer
         shall not be prejudiced by any investigation by or on behalf of the
         Owner into the affairs of any person (other than the Owner) being a
         party to any of the Relevant Documents, by the performance of any of
         the Relevant Documents or by any other act or thing which may be done
         or omitted to be done by the Owner under any of the Relevant Documents
         and which would or might, but for this Clause 2.4, prejudice such
         rights and remedies.

3        TERM OF CHARTER

3.1      The Owner shall let and demise and the Charterer shall take on hire
         the Ship, subject to the terms and conditions of this Charterparty,
         for the Pre-Primary Period and the Primary Period.

3.2      The Charterer shall be entitled (subject as hereinafter provided) on
         giving to the Owner notice (which notice, when given shall be
         irrevocable) not less than one hundred and eighty (180) days prior to
         the end of the Primary Period, to extend the Charter Period for a
         period of ten (10) years from the last day of the Primary Period.

3.3      Subject to the Charterer indemnifying the Owner for all losses, costs
         and expenses incurred by the Owner (including any losses, costs or
         expenses incurred by the Royal Bank of Scotland plc or any other party
         providing funds to the Owner in connection with the payments to be
         made and received by the Owner under the Purchase Agreement and the
         Relevant Documents) as a result of such termination, the Charterer
         shall be entitled on giving to the Owner not less than one hundred and
         twenty (120) days notice (which notice, when given, shall be
         irrevocable) to terminate the Charter Period on any date falling on or
         after the first anniversary of the Start Date.  Upon such termination
         the Charterer shall re-deliver the Ship to the, Owner in accordance
         with Clause 18 and shall pay to the Owner an amount equal to the
         Termination Sum on the date of such termination together with all
         amounts of charterhire and other moneys then due and owing to the
         Owner under this Charterparty or any of the other Relevant Documents.

3.4      If (a) the Charterer does not elect to extend the Charter Period
         pursuant to Clause 3.2, or (b) the Charterer shall give notice to
         terminate the Charter Period pursuant to Clause 3.3, then, provided
         that the Ship shall have been returned to the Owner in accordance with
         the subsequent provisions of this Clause 3.4 and in accordance with
         Clause 18 and that the Owner shall not be prevented from so doing for
         any reason whatsoever, the





                                       11
<PAGE>   18
         Owner shall endeavour to sell the Ship for delivery on, or as soon as
         possible after, in the case of (a) above, the expiry of the Primary
         Period or, in the case of (b) above, the date of the termination of
         the Charter Period pursuant to Clause 3.3.  Notwithstanding anything
         to the contrary in this charterparty, where the Charter Period expires
         by effluxion of time or if the Charterer gives notice to terminate the
         Charter Period pursuant to Clause 33, the Charter Period shall
         continue until and end on the date on which the Ship shall be
         delivered to a purchaser thereof pursuant to a sale of the Ship as
         contemplated by Cause 3.6, whenever such delivery shall take place; it
         being agreed that if by reason of the foregoing the Charter Period
         continues beyond 1st April 2001, the Secondary Period shall be deemed
         to have commenced and charterhire shall be payable accordingly.
         Immediately prior to such termination of the Charter Period the
         Charterer shall re-deliver the Ship to the Owner in accordance with
         Clause 18 and shall pay to the Owner an amount equal to the
         Termination Sum on the date of such termination together with all
         amounts of charterhire and other moneys then due and owing to the
         Owner under this Charterparty and/or any of the other Relevant
         Documents.

3.5      Upon the termination of the Charter Period and the sale of the Ship in
         accordance with the foregoing provisions of this Clause 3, the Net
         Sale Proceeds shall be applied by the Owner (subject to Clause 10.4)
         as follows:

         (a)     Firstly in or towards settlement of any amounts due and owing
                 by the Charterer to the Owner under the Charterparty or any
                 other Relevant Documents (including any interest due in
                 respect thereof);

         (b)     Secondly if the Charterer shall on or before the date of
                 application of the Net Sale Proceeds by the Owner have paid
                 the Termination Sum, or a part thereof, in accordance with
                 Clauses 3.3 or 3.4, in or towards refunding by way of rebate
                 of charterhire to the Charterer the amount of the Termination
                 Sum or part thereof so paid by the Charterer; and

         (c)     Thirdly an amount equal to two per cent (2%) of the Net Sale
                 Proceeds shall be retained by the Owner and any balance
                 remaining shall be paid to the Charterer by way of rebate of
                 charterhire and/or payment of sales commission or otherwise as
                 appropriate.

3.6      In respect of any sale of the Ship on termination or expiry of the
         Charter Period (other than pursuant to Clauses 21.3 or 25.1), the
         Charterer shall act as the sole and exclusive agent of the Owner for
         the purpose of negotiating the sale of the Ship on the following
         terms:

         (a)     the Charterer will endeavor to arrange the sale of the Ship
                 for a cash consideration on the best terms (including price)
                 reasonably obtainable on the open market provided that the
                 Ship shall not be sold to





                                       12
<PAGE>   19
                 (i)      the Charterer or any person or persons connected with
                          the Charterer (as the term "connected persons" is
                          used in section 839 ICTA); or

                 (ii)     any person acting in trust for, as nominee of, as
                          agent or otherwise as representative of or on behalf
                          of any of the persons referred to in (i) above;

                 and the Charterer will keep the Owner informed from time to
                 time of its progress;

         (b)     the Charterers authority will not extend to concluding a
                 contract for the sale of the Ship for which the Owner's
                 specific written authority will be required;

         (c)     the Ship shall be offered for sale and for delivery on, or as
                 soon as practicable after, such termination or expiry of the
                 Charter Period and any contract for its sale shall include
                 terms to the following effect:

                 (i)      that all conditions, representations or warranties,
                          expressed or implied by statute or otherwise, whether
                          as to the state or quality of the Ship or as to
                          description, fitness for purpose, merchantable
                          quality or otherwise, are, so far as is permitted by
                          law, expressly excluded as between the Owner and the
                          buyer save in respect of the warranty that the Owner
                          shall be passing such title to the Ship as received
                          from the Charterer free from any Encumbrances created
                          by the Owner, and

                 (ii)     that the sale is conditional upon the Owner first
                          recovering possession of the Ship;

                 Provided always that nothing in this Clause 3.6(c) shall
                 prevent the Charterer including any other representations and
                 warranties to be given directly by the Charterer to a buyer in
                 connection with such sale; and

         (d)     the Charterer's agency and authority pursuant to the foregoing
                 provisions shall terminate if a Relevant Event shall occur and
                 the Owner shall give notice to the Charterer terminating such
                 agency.

4        CONDITIONS PRECEDENT

4.1      The obligation of the Owner to charter the Ship to the Charterer under
         this Charterparty is subject to the condition that, not less than
         seven (7) Banking Days prior to the Expected Delivery Date (or by such
         later time prior to Delivery as the Owner may agree) the Owner shall
         have received the documents and evidence specified in Schedule 1 in
         form and substance satisfactory to the Owner.





                                       13
<PAGE>   20
4.2      The obligation of the Owner to charter the Ship to the Charterer under
         this Charterparty is subject to the further conditions:

         (a)     that the representations and warranties set out in Clause 2.1
                 and 2.2 are true and correct as if each were made with respect
                 to the facts and circumstances existing immediately prior to
                 the time when Delivery is to take place;

         (b)     that no Relevant Event shall have occurred and be continuing
                 or would arise by reason of Delivery taking place;

         (c)     that Delivery shall have occurred.

4.3      The conditions specified in Clauses 4.1 and 4.2 are inserted for the
         sole benefit of the Owner and may be waived in whole or in part and
         with or without conditions by the Owner provided that if any of the
         said conditions are outstanding after Delivery has taken place then,
         unless the Owner shall have given a specific written waiver or
         deferral in respect thereof, the Charterer shall ensure that such
         outstanding conditions are fled within thirty (30) days of the
         Delivery Date and the Owner shall be endued to treat the failure of
         the Charterer to perform such outstanding conditions within such
         period of thirty (30) days as a Termination Event.

5        DELIVERY AND ACCEPTANCE

5.1      The Owner appoints the Charterer and the Charterer accepts such
         appointment as the Owner's agent:

         (a)     to perform all duties required of the Owner under the Purchase
                 Agreement other than the payment of the Purchase Price of the
                 Ship thereunder;

         (b)     to carry out or procure the carrying out of all inspections
                 necessary or desirable to supervise the works agreed to be
                 carried out pursuant to the Conversion and Supply Agreement
                 and to evaluate the condition, seaworthiness and performance
                 of the Ship when it is tendered for redelivery after such
                 conversion works and all relevant parts and equipment
                 installed thereon; and

         (c)     to accept delivery of the Ship on behalf of the Owner when it
                 is tendered for delivery in accordance with the Purchase
                 Agreement, and on redelivery from conversion, and to sign on
                 behalf of the Owner any necessary documents evidencing such
                 delivery and acceptance provided in both cases that the
                 Charterer is first satisfied that on Delivery the Owner will
                 obtain good title to the Ship free from Encumbrances other
                 than Encumbrances within paragraphs (a), (b), (c) and (d) of
                 the definition of Permitted Encumbrances, and that both on
                 Delivery and redelivery from conversion, the Charterer is
                 satisfied that the Ship is and remains free from Encumbrances
                 other than Encumbrances within paragraphs (a), (b), (c)





                                       14
<PAGE>   21
                 and (d) of the definition of Permitted Encumbrances and is
                 seaworthy, and that the condition of the Ship is satisfactory
                 and accords on Delivery, with the Purchase Agreement, and on
                 redelivery from conversion, the specifications of the
                 Conversion and Supply Agreement.

5.2      The Charterer will give the Owner at least five (5) Banking Days prior
         written notice, in the form contained in Schedule 2, of the date upon
         which it is expected that the Charterer will deliver the Ship to the
         Owner pursuant to the Purchase Agreement.

5.3      Subject to Clause 4, immediately following Delivery the Ship shall be
         deemed delivered to the Charterer and shall become subject to and
         governed by this Charterparty, the Charter Period shall commence and
         the Charterer shall be deemed to have taken delivery of the Ship under
         this Charterparty.

5.4      The Charterer acknowledges and confirms that immediately upon title
         passing to the Owner in respect of the relevant conversion works to be
         carried out to the Ship and the supply of certain equipment thereto
         and BFE pursuant to the Conversion and Supply Agreement and/or the MWB
         Conversion Contract, such conversion works, equipment and BFE shall be
         part of the Ship and deemed delivered to the Charterer and shall
         become subject to and governed by this Charterparty and the Charterer
         shall be deemed to have taken delivery thereof under this
         Charterparty.

5.5      The Charterer acknowledges that prior to Delivery the Ship was
         chartered to the Charterer and owned by the Charterer, that the
         condition of the Ship on delivery to the Charterer and its compliance
         with the provisions and specifications of the Purchase Agreement shall
         be the sole responsibility of the Charterer, and the Charterer shall
         not be entitled for any reason whatsoever to refuse to accept delivery
         of the Ship under this Charterparty once the same has been accepted by
         it, on behalf of the Owner, under the Purchase Agreement and the Owner
         shall not be liable for any loss or expense, or any loss of profit,
         resulting directly or indirectly from any defect or alleged defect in
         the Ship or failure or alleged failure of the Ship to comply with the
         Purchase Agreement.

5.6      The conversion works, BFE and other equipment to be installed on the
         Ship pursuant to the Conversion and Supply Agreement are carried out
         at the sole risk of the Charterer. Accordingly the Charterer shall not
         be entitled for any reason whatsoever to reject the Ship under this
         Charterparty even if the Ship is unseaworthy or suffering from any
         defect as a result of such conversion works or installation of parts
         and equipment.

5.7      The Owner shall not be responsible for any loss or expense, or any
         loss of profit, arising from any delay in the delivery of, or failure
         to deliver, the Ship to the Charterer under this Charterparty.

5.8      If for any reason the Ship shall not have been delivered to and
         accepted by the Charterer in accordance with Clause 5.3 by 31st
         December, 1990 then the Owner shall have no





                                       15
<PAGE>   22
         further obligation under this Charterparty to charter the Ship to the
         Charterer (unless the Owner and Charterer shall otherwise agree in
         writing) and the Charterer shall (in addition to any other obligation
         it may then have under Clause 9 to indemnify and hold harmless the
         Owner as therein provided) reimburse to the Owner forthwith on demand
         all amounts which the Owner shall have expended or shall thereafter be
         required to expend under the Purchase Agreement or otherwise in
         connection with the purchase of the Ship, together with interest on
         each amount so demanded at the Relevant Rate of Interest from the date
         of demand until the date of reimbursement (both before and after any
         relevant judgment).

5.9      The Charterer shall indemnify the Owner in respect of any liabilities,
         losses, costs or expenses incurred by the Owner as a consequence of
         any delay in the delivery of or non-delivery of the Ship to the Owner
         under the Purchase Agreement and/or to the Charterer under this
         Charterparty.

6        EXTENT OF OWNER'S LIABILITY; THIRD PARTY WARRANTIES

6.1      The Owner warrants that, subject to Clause 21.1 and Clause 25, the
         Owner shall not interfere during the Charter Period with the use,
         possession and quiet enjoyment of the Ship by the Charterer on the
         terms of this Charterparty.

6.2      The Charterer expressly agrees and acknowledges that, save only as
         provided in Clauses 6.1 and 14.2, no condition, warranty or
         representation of any kind is or has been given by or on behalf of the
         Owner in respect of the Ship or any part thereof or any work during
         conversion or any part or equipment then installed or any BFE, and
         accordingly the Charterer confirms that it has not, in entering into
         this Charterparty, relied on any condition, warranty or representation
         by the Owner or any person on the Owner's behalf (whether authorised
         or not), express or implied, whether arising by law or otherwise in
         relation to the Ship or any part thereof or any work during conversion
         or any part or equipment then installed or any BFE, including, without
         limitation, warranties or representations as to the description,
         seaworthiness, merchantability, fitness for any purpose, value,
         condition, design or operation of any kind or nature of the Ship or
         any part thereof or any work during conversion or any part or
         equipment then installed or any BFE, and the benefit of any such
         condition, warranty or representation by the Owner is hereby
         irrevocably and unconditionally waived by the Charterer. The Charterer
         further acknowledges and agrees that the Ship is to be designed,
         manufactured, assembled and erected pursuant to the Conversion and
         Supply Agreement without reference to or involvement of the Owner
         other than payments of the Conversion and Supply Price. To the extent
         permissible under applicable law, the Charterer hereby also waives any
         rights which it may have in tort in respect of any of the matters
         referred to above and irrevocably agrees that the Owner shall have no
         greater liability in tort in respect of any such matter than it would
         have in contract after taking account of all of the foregoing
         exclusions. No third party making any representation or warranty
         relating to the Ship or any part thereof or any work during conversion
         or any part or equipment then installed





                                       16
<PAGE>   23
         or any BFE is the agent of the Owner nor has any such third party
         authority to bind the Owner thereby.

6.3      During the Charter Period the Owner will use reasonable endeavors to
         extend to the Charterer the benefit of all warranties and indemnities
         given by any manufacturer or supplier of any part of the Ship or any
         work during conversion or any part or equipment then installed or any
         BFE. The Charterer shall be entitled during the Charter Period, with
         the prior written approval of the Owner, to take such action upon any
         such warranty or indemnity in the name of the Owner against any such
         manufacturer or supplier as the Charterer shall see fit, but subject
         to the Charterer first ensuring that the Owner is indemnified and
         secured to its reasonable satisfaction against all costs and expenses
         thereby incurred or to be incurred.

7        CHARTERHIRE

7.1      During the Primary Period the Charterer shall pay to the Owner on the
         respective Charterhire Payment Dates installments of charterhire for
         the Ship in arrears, each such instalment being of the amount
         specified in paragraph 2 of Schedule 3 one such instalment being
         payable on each Charterhire Payment Date falling during the Primary
         Period.

7.2      During the Secondary Period the Charterer shall pay to the Owner on
         the respective Charterhire Payment Dates installments of charterhire
         for the Ship in advance, each such instalment being of the amount
         specified in paragraph 6 of Schedule 3 one such installment being
         payable on each Charterhire Payment Date falling during the Secondary
         Period.

7.3      The installments of charterhire and all other sums payable by the
         Charterer to the Owner under this Charterparty are exclusive of any
         Value Added Tax or similar tax payable in respect thereof which shall
         in each case be paid in addition thereto.

7.4      The Charterer's obligation to pay charterhire and make other payments
         in accordance with this Charterparty shall, subject to Clause 21.3, be
         absolute and unconditional irrespective of any contingency whatsoever
         including (but not limited to) (i) any right of set-off, counterclaim,
         recoupment, defense or other right which either party hereto may have
         against the other, (ii) any unavailability of the Ship for any reason,
         including, but not limited to, any lack or invalidity of title or any
         other defect in the title, seaworthiness, merchantability, fitness for
         any purpose, condition, design, or operation of any kind or nature of
         the Ship, or the ineligibility of the Ship for any particular use or
         trade, or for registration or documentation under the laws of any
         relevant jurisdiction, or any damage to the Ship, (iii) any failure or
         delay on the part of either party hereto, whether with or without
         fault on its part, in perforating or complying with any of the terms
         or conditions of this Charterparty, (iv) any insolvency, bankruptcy,
         administration, reorganisation, arrangement, readjustment of debt,
         dissolution, liquidation or similar





                                       17
<PAGE>   24
         proceedings by or against the Owner or the Charterer, (v) any lack of
         due authorisation of, or other defect in, this Charterparty.

7.5      The provisions of this Clause 7 with regard to the calculation and
         payment of charterhire during the Pre-Primary Period and the Primary
         Period are subject to adjustment in accordance with the charterhire
         adjustment provisions contained in Schedule 3.

7.6      No charterhire paid in advance shall (except as expressly contemplated
         by the provisions of this Charterparty be repayable by or recoverable
         from the Owner.

8        PAYMENTS, INTEREST AND CALCULATIONS

8.1      All payments to be made by the Charterer under this Charterparty shall
         be made (unless specifically otherwise provided in this Charterparty)
         without prior demand in full, without any set-off or counterclaim
         whatsoever and, subject as provided in Clause 10.3, free and clear of
         any deductions or withholdings in Pounds (or, in the case of indemnity
         payments, in the currency in which the cost or expense which is the
         subject of the indemnity payment is incurred) for value on the day on
         which payment is due to the account of the Owner with The Royal Bank
         of Scotland PLC, 45 The Promenade, Cheltenham, Gloucestershire GL50
         lPY (Sort Code: 16-16-13 and Account Number: 12176088) or to such
         other account as the Owner may from time to time notify the Charterer
         in writing.

8.2      Other than any sum payable on demand, which shall be payable in
         accordance with such demand, when any payment under any of the
         Relevant Documents would otherwise be due on a day which is not a
         Banking Day, the due date for payment shall be the preceding Banking
         Day.

8.3      If the Charterer fails to pay any sum (including without limitation,
         any sum payable pursuant to this Clause 8.3) on its due date for
         payment under this Charterparty the Charterer shall pay to the Owner
         on demand interest on such sum, compounded daily, from the due date up
         to the date of actual payment (as well after as before any relevant
         judgment) at the Relevant Rate of Interest.

8.4      All interest under this Charterparty shall accrue from day to day and
         shall be calculated on the basis of the actual days elapsed and a 365
         day year.

8.5      Any certificate or determination of the Owner as to any rate of
         interest or any other amount payable under this Charterparty shall in
         the absence of manifest error, be conclusive and binding on the
         Charterer.

8.6      If any sum due from the Charterer under any of the Relevant Documents
         or under any order or judgment given or made in relation thereto has
         to be converted from the currency, ("the first currency") in which the
         same is payable under any of the Relevant





                                       18
<PAGE>   25
         Documents or under such order or judgment into another currency ("the
         second currency") for the purpose of (i) making or filing a claim or
         proof against the Charterer, (ii) obtaining an order or judgment in
         any court or other tribunal or (iii) enforcing any order or judgment
         given or made in relation to such Relevant Document, the Charterer
         shall indemnify and hold harmless the Owner from and against any loss
         suffered as a result of any difference between (a) the rate of
         exchange used for such purpose to convert the sum in question from the
         first currency into the second currency and (b) the rate or rates of
         exchange at which the Owner may in the ordinary course of business
         purchase the first currency with the second currency upon receipt of a
         sum paid to it in satisfaction, in whole or in part, of any such
         order, judgment, claim or proof.  Any amount due from the Charterer
         under this Clause 8.6 shall be due as a separate debt and shall not be
         affected by judgment being obtained for any other sums due under or in
         respect of any of the Relevant Documents and the term "rate of
         exchange" includes any premium and costs of exchange payable in
         connection with the purchase of the first currency with the second
         currency.

9        COSTS AND INDEMNITIES

9.1      The Charterer shall pay promptly all costs or expenses (other than
         payment of the Purchase Price pursuant to the Purchase Agreement) of,
         or arising from, the purchase, delivery, import, export, design,
         registration, classification, ownership, possession, control, use,
         management, manning, victualling, the provision of bunkers and
         lubricating oils, chartering, sub-chartering, insurance, maintenance,
         conversion, repair, dry docking, survey, refurbishment, condition,
         service, overhaul modification, change, alteration, loss, damage,
         storage, laying up, removal, re-delivery, sale or disposal of, in or
         to the Ship, and all costs or expenses otherwise arising in connection
         with the Ship or the performance of the Charterer's obligations under
         any of the Relevant Documents.

9.2      The Charterer shall pay all stamp, documentary, registration or other
         like Taxes (including any such Taxes payable by the Owner) imposed on
         or in connection with the Relevant Documents and shall indemnify the
         Owner against any liability arising by any delay or omission of the
         Charterer to pay such duties or Taxes.

9.3      Whether or not the Ship is delivered to the Charterer pursuant to this
         Charterparty, the Charterer shall pay to the Owner on demand:

         (a)     all expenses (including legal advisory, printing, and
                 out-of-pocket expenses) incurred by the Owner in connection
                 with the negotiation, preparation, and execution of the
                 Relevant Documents, and of any amendment or extension of, or
                 the granting of any waiver or consent under, any of the
                 Relevant Documents, and

         (b)     all expenses (including legal, survey and other costs)
                 incurred by the Owner in contemplation of, or otherwise in
                 connection with, the enforcement of, or preservation of any
                 rights under, any of the Relevant Documents, or otherwise





                                       19
<PAGE>   26
                 in respect of moneys owing under any of the Relevant
                 Documents, or in respect of breach of any representation,
                 warranty, covenant, agreement, condition or stipulation
                 therein contained or in respect of the repossession of the
                 Ship.

                 All expenses payable pursuant to this Clause 9.3 shall be paid
                 together with any irrecoverable Value Added Tax or similar tax
                 thereon, and in the currency in which the same are incurred by
                 the Owner.

9.4      The Charterer shall indemnify and hold harmless the Owner, without
         prejudice to any of the Owner's other rights under any of the Relevant
         Documents, from and against:

         (a)     any costs or expenses which the Charterer has agreed to pay
                 but which shall nevertheless be claimed from or assessed
                 against or paid by the Owner, and against any liability
                 incurred by the Owner by reason of any delay or failure of the
                 Charterer to pay any such costs or expenses;

         (b)     any Taxes which the Charterer has agreed to pay but which
                 shall nevertheless be claimed from or assessed against or paid
                 by the Owner, and against any liability incurred by the Owner
                 by reason of any delay or failure of the Charterer to pay any
                 such Taxes including without limitation, any delay or failure
                 of the Charterer to make any such deduction or withholding as
                 is referred to in Clause 10.3 or by reason of any increased
                 payment as is referred to in Clause 10.3 not being made on the
                 due date for such payment.

9.5      Without prejudice to the Charterer's obligations under Clauses 9.1 to
         9.4 inclusive, the Charterer agrees at all times, whether before,
         during or after the Charter Period, to indemnify and hold harmless the
         Owner from and against all costs, expenses, payments (other than the
         payment by the Owner to the Charterer of the Purchase Price pursuant
         to the Purchase Agreement and the Conversion and Supply Price pursuant
         to the Conversion and Supply Agreement), charges, losses, demands,
         liabilities, claims, actions, proceedings (whether civil or criminal),
         penalties, fines, damages, judgments, orders or other sanctions,
         liens, salvage, General Average (in this Clause 9.5 together referred
         to as "Losses") which may be incurred by, or made or asserted against
         the Owner at any time:

         (a)     relating to, or arising directly or indirectly in any manner
                 or for any cause or reason whatsoever out of, the design,
                 nature, description, manufacture, testing, purchase, delivery,
                 import, export, registration, flag, classification,
                 certification, ownership, possession, control, use, operation,
                 manning, crewing, navigation, victualling, supply or servicing
                 (whether at sea or not), provision of bunkers and lubricating
                 oils, chartering, sub-chartering, insurance, maintenance,
                 conversion, repair, dry docking, surveys, refurbishment,
                 condition, service, overhaul, modification, change,
                 alteration, loss, damage, removal, laying up, storage,
                 re-delivery, sale or disposal of, in or to the Ship,
                 conversion works, parts and





                                       20
<PAGE>   27
                 equipment installed and BFE or otherwise in connection with
                 the Ship, conversion works, parts, equipment and BFE, or
                 relating to loss or destruction of or damage to any property,
                 or death or injury of, or other loss of whatsoever nature
                 suffered by, any person caused by, relating to, or arising
                 from or out of (in each case whether directly or indirectly)
                 any of the foregoing matters;

         (b)     which may be made or brought on the ground that any design,
                 article or material in the Ship or in respect of the
                 conversion works, parts, equipment and BFE to be installed and
                 supplied to the Ship pursuant to the Conversion and Supply
                 Agreement or the operation or use thereof constitutes an
                 infringement of patent, intellectual property right or any
                 other right whatsoever;

         (c)     in preventing or attempting to prevent the arrest,
                 confiscation, seizure, taking in execution, impounding,
                 forfeiture or detention of the Ship, or in securing the
                 release of the Ship or any of the parts, equipment or BFE to
                 be installed on the Ship except to the extent any Losses are
                 incurred in this respect as a result of the Owner's breach of
                 Clause 6.1 due to any Encumbrance on the Ship directly created
                 by the Owner which adversely affects the operation of the
                 Ship;

         (d)     as a consequence of any default in payment by the Charterer of
                 any sum under any of the Relevant Documents when due or any
                 other default by the Charterer in the due and punctual
                 performance of its obligations under any of the Relevant
                 Documents.

9.6      Notwithstanding anything to the contrary contained in this
         Charterparty, the indemnities by the Charterer in favour of the Owner
         contained in this Charterparty shall continue in full force and effect
         notwithstanding any breach by the Owner or the Charterer of the terms
         of this Charterparty (including any fundamental breach) or any of the
         other Relevant Documents, the termination of the chartering of the
         Ship to the Charterer under this Charterparty, the repudiation by the
         Owner or the Charterer of this Charterparty, or the expiration of the
         Charter Period by effluxion of time or otherwise.

9.7      Moneys becoming due by the Charterer to the Owner under the
         indemnities contained in this Clause 9 or elsewhere in the Relevant
         Documents shall be paid on demand made by the Owner and shall be paid
         together with interest thereon at the Relevant Rate of Interest from
         the date of demand by the Owner to the date of reimbursement by the
         Charterer to the Owner (after as well as before judgment).

10       TAXATION

10.1     The Charterer shall pay promptly all Taxes levied or assessed on or in
         respect of the Ship, any payments made under any of the Relevant
         Documents or any of the transactions contemplated by any of the
         Relevant Documents but, subject to the remaining provisions of this
         Clause 10, excluding any Taxes assessed against the Owner





                                       21
<PAGE>   28
         by reference to its overall profits, or by reference to its gains, if
         any, realised in connection with the ultimate disposal of the Ship, or
         arising out of a Total Loss.

10.2     (a)     Sums payable to the Owner by the Charterer under any Relevant
                 Document by way of indemnity or reimbursement shad be
                 calculated on an after-tax basis. Accordingly, if and to the
                 extent that any such sum payable to the Owner is taxable in
                 the hands of the Owner as the auditors of the Owner (acting as
                 experts and not as arbitrators) shall certify from time to
                 time such sum shall be increased to an amount which (after
                 subtracting any Taxation suffered by the Owner on the
                 increased payment and after taking into account any deduction
                 for Taxation purposes available to the Owner in respect of the
                 discharge by the Owner of any corresponding liability to a
                 third party) shall equal the amount which the Owner would have
                 received had the sum payable by the Charterer not been taxable
                 in the hands of the Owner. If the sum payable by the Charterer
                 is initially paid on the basis that it is not taxable in the
                 hands of the Owner and it is subsequently determined to be
                 taxable or vice versa, such adjustment and payment shall be
                 made between the Owner and the Charterer as the auditors of
                 the Owner (acting as experts and not as arbitrators) shall
                 certify as appropriate to restore the after-tax position of
                 the Owner to that which it would have been had the adjustment
                 not been necessary.

         (b)     If and to the extent that any sum (the "indemnity sum")
                 constituting (directly or indirectly) an indemnity to the
                 Owner but paid by the Charterer to any person other than the
                 Owner, shall be treated as taxable in the hands of the Owner,
                 the Charterer shall pay to the Owner such sum (the
                 "compensating sum") as (after subtracting any Taxation
                 suffered by the Owner on the compensating sum and after taking
                 into account any deductions for the purposes of Taxation
                 available to the Owner in respect of any corresponding payment
                 treated as made by the Owner to such person) shall reimburse
                 the Owner for any Taxation suffered by it in respect of the
                 indemnity sum.

         (c)     For the purposes of this Clause 10.2 a sum shall be deemed to
                 be taxable in the hands of the Owner if it falls to be taken
                 into account in computing the profits or gains of the Owner
                 for the purposes of Taxation and if so the Owner shall be
                 deemed to have suffered Taxation thereon at the rate of
                 Taxation applicable to the Owner's profits or gains for the
                 period in which the payment falls to be taken into account for
                 the purposes of such Taxation.

10.3     If at any time any applicable law, regulation or regulatory
         requirement, or any governmental authority, monetary agency or central
         bank requires the Charterer to make any deduction or withholding in
         respect of Taxes from any payment due under the Relevant Documents:





                                       22
<PAGE>   29
                 (i)      the sum due from the Charterer in respect of such
                          payment shall be increased to the extent necessary to
                          ensure that, after the making of such deduction or
                          withholding, the Owner receives on the due date for
                          such payment a net sum equal to the sum which it
                          would have received had no such deduction or
                          withholding been required to be made;

                 (ii)     the Charterer shall pay to the relevant authority
                          within the period for payment permitted by applicable
                          law the full amount of the deduction or withholding
                          (including, but without prejudice to the generality
                          of the foregoing, the full amount of any deduction or
                          withholding from any increased amount paid pursuant
                          to this Clause 103); and

                 (iii)    the Charterer shall furnish to the Owner within the
                          period for payment permitted by applicable law,
                          evidence of payment to the relevant authority of all
                          amounts deducted or withheld as aforesaid.

10.4     If the Owner is required to pay any sum to the Charterer or any other
         party under any of the Relevant Documents and such sum is payable out
         of or represents a reimbursement of an amount which is brought into
         account in computing the profits or gains of the Owner for the
         purposes of Taxation and such payment will not he allowed to the Owner
         as a deductible trading expense or as a basis for, or otherwise as, a
         deduction or off-set for Taxation purposes in the accounting period of
         the Owner in which it is required to he paid as the auditors of the
         Owner (acting as experts and not as arbitrators) shall certify from
         time to time, the Charterer shall pay to the Owner such amount as
         shall put the Owner in the same after-tax position as the Owner would
         have been in had the payment been allowed as a deductible trading
         expense or as a basis for, or otherwise as, a deduction or set-off as
         aforesaid.  If any such payment is initially made on the basis that it
         is a deductible trading expense, or that it will be allowed as a basis
         for, or otherwise as, a deduction or off-set of the Owner for tax
         purposes in the accounting period of the Owner in which it is incurred
         and it is subsequently determined that it is not, or vice versa, such
         adjustment and payments, if any, shad be made between the Owner and
         the Charterer as the Owner's auditors from time to time (acting as
         experts and not as arbitrators) may certify as appropriate in order to
         restore the after-tax position of the Owner (or any company within the
         group of companies of which the Owner is a member to which relief from
         corporation tax in respect of the payment was surrendered) to that
         which it would have been had the adjustment not been necessary.

11       GENERAL UNDERTAKINGS

11.1.    The Charterer undertakes with the Owner that it will:





                                       23
<PAGE>   30
         (a)     Notification of Relevant Event

                 promptly inform the Owner of any Relevant Event forthwith upon
                 becoming aware thereof;

         (b)     Consents and Authorisations

                 without prejudice to Clauses 2.2 and 4, obtain or cause to be
                 obtained, maintain in full force and effect and comply in all
                 material respects with the conditions and restrictions (if
                 any) imposed in, or in connection with, every consent,
                 authorisation, licence or approval of governmental or public
                 bodies or authorities or courts and do, or cause to be done,
                 all other acts and things, which may from time to time be
                 necessary or desirable under applicable law for the continued
                 due performance of all its obligations under any of the
                 Relevant Documents;

         (c)     Preparation of Accounts


                 cause to be prepared in each financial year and cause to be
                 certified by its auditors consolidated financial statements
                 which are prepared in accordance with generally accepted
                 accounting principles and practices in England which have been
                 consistently applied and present fairly and accurately the
                 financial position of the Charterer as at the end of the
                 relevant financial year and the results of the operations of
                 the Charterer for the relevant financial year, which discloses
                 all significant liabilities (contingent or otherwise) of the
                 Charterer;

         (d)     Supply of Accounts

                 deliver to the Owner a copy of the financial statements
                 referred to in Clause 11.1 (c) as soon as practicable but not
                 later than two hundred and forty (240) days after the end of
                 the financial period to which they relate and a copy of every
                 report, notice or like document issued by it to its
                 shareholders or creditors generally (in each case at the time
                 of issue thereof);

         (e)     Information concerning the Charterer

                 promptly provide the Owner with such financial and other
                 information concerning the Charterer and its affairs as the
                 Owner may from time to time reasonably require;

         (f)     Information concerning the Ship

                 furnish the Owner promptly with all such information as it may
                 from time to time reasonably require regarding the Ship, her
                 insurance, condition, maintenance,





                                       24
<PAGE>   31
                 employment, position and engagements, particulars of all
                 towages and salvages, and copies of all charters and other
                 contracts for her employment, or otherwise howsoever
                 concerning her; and

         (g)     Observance of Covenants

                 duly and punctually perform each of its obligations under this
                 Charterparty and the other Relevant Documents.

11.2     Protection of Owner's Rights
         The Charterer hereby further undertakes with the Owner that throughout
         the Charter Period it will:

         (a)     Disposal of the Ship

                 not attempt or hold itself out as having any power to sell,
                 agree to selL transfer or otherwise dispose of or (except to
                 avoid loss of life or personal injury or as otherwise agreed
                 pursuant to Clause 21) abandon the Ship, any share or interest
                 therein;

         (b)     Encumbrances

                 not create or agree or purport to create any Encumbrance over
                 the Ship, any share or interest therein or in the Insurances
                 or Requisition Compensation or any part thereof (other than
                 Permitted Encumbrances);

         (c)     Notification of Arrest

                 notify the Owner promptly by telex of any arrest or detention
                 of the Ship or any exercise or purported exercise of a lien or
                 other claim on the Ship or the Insurances or any part thereof;

         (d)     Prevention of and Release from Arrest

                 promptly pay and discharge all debts, damages, liabilities and
                 outgoings whatsoever which have given or may give rise to
                 maritime, statutory or possessory liens on, or claims
                 enforceable against, the Ship or the Insurances or any part
                 thereof and, in the event of a writ or libel being filed
                 against the Ship or the Insurances or any part thereof, or of
                 any of the same being arrested, attached or levied upon
                 pursuant to legal process or purported legal process or in the
                 event of detention of the Ship in exercise or purported
                 exercise of any such lien or claim as aforesaid, to procure
                 the release of the Ship and the Insurances from such arrest,
                 detention, attachment or levy or, as the case may be, the
                 discharge of the writ or libel forthwith upon receiving notice
                 thereof by providing





                                       25
<PAGE>   32
                 bail or procuring the provision of security or otherwise as
                 the circumstances may require;

         (e)     No pledging of Owner's Credit

                 not pledge the credit of the Owner for any maintenance,
                 service, repairs, drydocking or modifications to, or changes
                 or alterations in, the Ship or for any other purpose
                 whatsoever,

         (f)     Protection of Owner's Rights in the Ship

                 not do or permit to be done any act or thing which might
                 jeopardise the title, rights and interest of the Owner in the
                 Ship and/or omit or permit to be omitted to be done any act
                 which might prevent that title and those rights and interest
                 from being jeopardized;

         (g)     Notice of Owner's Rights

                 generally on all occasions when the ownership of the Ship is
                 relevant make clear to third parties that the same is the
                 property of the Owner and the Charterer agrees to fasten to
                 the Ship in a conspicuous place and to keep so fastened during
                 the Charter Period a notice reading as follows:

                          "This Ship is the property of and is registered in
                          the name of ROYAL BANK OF SCOTLAND (INDUSTRIAL
                          LEASING) LIMITED. It is under demise charter to
                          SIMON-HORIZON LIMITED and, by the terms of the
                          Charterparty, neither the Charterer nor the Master
                          nor any servant or agent thereof nor any other person
                          has any right, power or authority whatsoever to
                          contract on behalf of the Owner or to pledge the
                          Owner's credit or to involve the Owner in any
                          liability whatsoever and neither has the Owner nor
                          the Charterer nor the Master nor any servant or agent
                          thereof nor any other person has any right, power or
                          authority whatsoever to create, incur, or permit to
                          be imposed on the Ship any lien whatsoever except for
                          General Average, crews' wages and salvage"

                 or in such other form as the Owner may require from time to
                 time;

                 the Charterer shall not remove or cover up such notice, and
                 will not place or permit to be placed any other notice
                 (affecting the ownership of the Ship or otherwise relating to
                 the rights of the Owner and dealing with the rights of any
                 person other than the Owner in or on the Ship or any part
                 thereof) without prior written consent of the Owner such
                 consent not to be unreasonably withheld so long as the same is
                 not inconsistent with the rights of the Owner of the Ship;





                                       26
<PAGE>   33
                 the Charterer agrees to give written instructions with regard
                 to the foregoing matters to the Master of the Ship, such
                 instructions to be in such terms as may from time to time be
                 required by the Owner; and

         (h)     Release from Arrest Owner's Vessels

                 if the Ship or any other vessel for the time being owned (in
                 whole or in part) by or chartered to the Owner shall at any
                 time have a writ or libel filed against it or be arrested,
                 attached or levied upon pursuant to any legal process or
                 purported legal process or be detained in exercise or
                 purported exercise of any, lien or claim of whatsoever nature,
                 whether arising out of the use or operation of the Ship or out
                 of the use or operation of any other vessel owned by or
                 chartered to the Charterer or other company (other than the
                 Owner) associated with, the Charterer or its subsidiaries or
                 associated companies or otherwise by reason of the act or
                 omission of any of the aforesaid persons, the Charterer shall
                 forthwith upon receiving notice thereof at its expense procure
                 the release of the Ship or such other vessel (as the case may
                 require) from such arrest, detention, attachment or levy or,
                 as the case may be, the discharge of the writ or libel by
                 providing bail or procuring the provision of security or
                 otherwise as the circumstances may require and the Charterer
                 shall be responsible for discharging each and every liability
                 in connection with any such process, claim, lien or other
                 action. Without prejudice to the generality of the other
                 indemnities contained in this Charterparty, should any other
                 vessel owned by the Owner and chartered by the Owner otherwise
                 than to the Charterer be arrested, detained, attached or
                 levied upon or be the subject of a writ or libel in such
                 circumstances, the Charterer shall indemnify the Owner against
                 all claims made on the Owner by the charterers of such other
                 vessel in connection with such arrest, detention, attachment,
                 levy, writ or libel.

12       SUB CHARTERING

         The Charterer will not at any time without the prior written consent
         of the Owner (which the Owner shall have full liberty to withhold)
         and, if such consent is given, only subject to such conditions as the
         Owner may impose, part with the possession or operational control of
         the Ship (except for the purpose of maintenance, service, repair or
         overhaul work or any modifications, changes or alterations permitted
         under this Charterparty and the Conversion and Supply Agreement) or
         sub-charter the Ship:

         (a)     on demise charter for any period;

         (b)     by any time or consecutive voyage charter for a term which
                 exceeds or which by virtue of any optional extensions therein
                 contained may exceed thirteen months' duration;





                                       27
<PAGE>   34
         (c)     on terms whereby more than two months' hire (or the
                 equivalent) is payable in advance;

         (d)     below the market rate prevailing at the time when the Ship is
                 fixed or on any other than arms' length terms;

         (e)     on any charter for a period extending or capable of extending
                 beyond the end of the Charter Period as extended pursuant to
                 Clause 3.2;

         (f)     on terms involving any transfer or purported transfer of title
                 or interest in the Ship or part thereof or which would
                 contravene the provisions of this Charterparty or any of the
                 other Relevant Documents (including, without limitation, the
                 provisions of Clause 13.2(d) relating to qualifying use during
                 the requisite period as therein referred to).

13       USE AND TRADE OF THE SHIP


13.1     Permitted Use

         Subject to the other terms and conditions of this Charterparty and the
         other Relevant Documents, the Charterer shall have the full and
         exclusive use control and command of the Ship during the Charter
         Period and may operate the Ship or employ her throughout the world in
         any lawful trade for which she is suitable.

13.2     Undertakings concerning Use

         The Charterer hereby undertakes with the Owner that throughout the
         Charter Period it will:

         (a)     Ship's Registration

                 not do or suffer to be done anything whereby the documentation
                 of the Ship for the time being in accordance with the
                 provisions of Clause 14.2 may be forfeited or imperilled;

         (b)     Employment

                 not employ the Ship or permit her employment in any manner,
                 trade or business which is forbidden by International Law, or
                 which is unlawful or illicit under the law of any relevant
                 jurisdiction, or in carrying illicit or prohibited goods, or
                 in any manner whatsoever which may render her liable to
                 condemnation in a Prize Court, or to destruction, seizure,
                 confiscation, penalty or sanctions and, in the event of
                 hostilities in any part of the world (whether war be declared
                 or not), not





                                       28
<PAGE>   35
                 employ the Ship or permit her employment in carrying any
                 contraband goods, or enter or trade to or continue to trade in
                 any zone which is declared a war zone by any government or by
                 the Ship's war risks insurers unless such special insurance
                 cover as the Owner may require shall have been effected by the
                 Charterer and at its expense;

         (c)     Payment of Outgoings and Evidence of Payments

                 pay all tolls, dues and other outgoings whatsoever in respect
                 of the Ship and the Insurances and keep proper books of
                 account in respect of the Ship and, as and when the Owner may
                 so require, make such books available for inspection on behalf
                 of the Owner and furnish satisfactory evidence that the wages
                 and allotments and the insurance and pension contributions of
                 the Master and crew are being prompter and regularly paid and
                 that all deductions from crew's wages in respect of United
                 Kingdom tax liability are being properly accounted for and
                 that the Master has no claim for disbursements other than
                 those incurred by him in the ordinary course of trading on the
                 voyage then in progress;


         (d)     Operation in the U.S.A. or Canada

                 give the Owner at least ten (10) Banking Days prior written
                 notice if the Ship is to be operated in or into or offshore
                 from the United States of America or Canada, and prior to the
                 commencement of such operation, to increase the amount of
                 protection and indemnity, pollution risk and other legal
                 liability insurance referred to in Clause 16.1 (a) to such
                 amount as the Owner may require;

         (e)     Use for a Qualifying Purpose

                 not to use the Ship or permit the Ship to be used and shall
                 procure that the Ship is not used other than for a qualifying
                 purpose during the requisite period (as each such term is
                 defined in section 40 CAA) so as to result in the application
                 of sections 42, 43, 44 and 46 CAA and shall immediately notify
                 the Owner if at any time within such requisite period the Ship
                 is used for leasing to a non-resident within the meaning of
                 section 50 CAA and also notify the Owner of any event or
                 matter which under section 48 CAA ought to be notified by the
                 Owner to the Board of the Inland Revenue or any Inspector of
                 Taxes in connection with the Ship or the chartering thereof
                 and shall promptly furnish when the Owner may require such
                 information as may properly be required to be so furnished by
                 the Owner to the Board of the Inland Revenue and Inspector of
                 Taxes regarding the chartering of the Ship or the use to which
                 it is being put or has been put, in order to enable the Owner
                 to comply with the provisions of section 48 CAA or to respond
                 to such a request; and





                                       29
<PAGE>   36
         (f)     Bills of Lading

                 if applicable, procure that all Bills of Invading issued for
                 carriage of goods by the Ship shall contain a Paramount Clause
                 incorporating any legislation relating to carrier's liability
                 for cargo compulsorily acquired applicable in the trade or, if
                 no such legislation exists, Bills of Lading incorporating the
                 British Carriage of Goods by Sea Act 1971 and that all such
                 Bills of Lading shall also contain the amended New Jason
                 Clause and the Both-Blame Collision Clause and, without
                 prejudice to provisions of Clause 30.4, provide that the
                 General Average, if any, shall be settled according to the
                 York-Antwerp Rules of 1974 in London.

14       TITLE, REGISTRATION, NAME AND HOUSE FLAG

14.1     Title

         Title to the Ship shall remain vested in the Owner. The Charterer
         shall have no right, title or interest in or to the Ship or any part
         thereof except the right to use the same upon the terms and conditions
         contained in this Charterparty. It is hereby expressly declared that
         the Charterer shall not have any option or right to acquire title to
         or any proprietary interest in the Ship or any part thereof. Subject
         to Clause 6.1, nothing in this Clause 14.1 shah be construed as
         imposing any liability on the Owner to the Charterer in respect of or
         arising out of the acts or omissions of any third party (including any
         charterer or lessee of any other vessel or assets of the Owner)
         affecting the Charterer or the Ship or otherwise.

14.2     Initial Registration

         The Owner shall take all necessary steps to register itself as the
         registered owner of the Ship upon Delivery under the laws of the
         Commonwealth of the Bahamas at the Port of Nassau in the name of the
         Owner and thereafter subject to Clause 14.3 shall during the Charter
         Period do all that may be necessary on its part to maintain such
         registration in force.

14.3     Transfer of Flag or Registry

         The Charterer may at any time and from time to time during the Charter
         Period, request the Owner to transfer the register of the Ship to any
         port and/or to re-document the Ship under laws of any jurisdiction
         other than the port and/or jurisdiction at which the Ship is for the
         time being registered and/or under whose laws the Ship is for the time
         being documented. If the Owner approves of such transfer of register
         (such approval not to be unreasonably withheld) and/or
         re-documentation of the Ship, the Owner shall at the request of the
         Charterer, co- operate with and permit the Charterer to take all
         necessary steps to comply with such request and thereafter shall
         during the Charter Period co-operate with the Charterer to take such
         actions as the Charterer may reasonably





                                       30
<PAGE>   37
         require to maintain the documentation of the Ship at the port to which
         the register of the Ship is so transferred and/or under the laws of
         the jurisdiction under whose laws the Ship is so re-documented. For
         the purposes of this Clause 14.3, the Owner shall be deemed to approve
         the transfer of the register of the Ship to any port of registry in
         the United Kingdom or in any relevant overseas territory (as that
         expression is defined in section 57(1) of the Merchant Shipping Act
         1988).

         If, in the reasonable opinion of the Owner it shall become impossible,
         unlawful, impracticable or undesirable for the Owner to maintain the
         documentation of the Ship under the laws of any jurisdiction (other
         than the United Kingdom or any other such relevant overseas territory)
         under whose laws the Ship is for the time being documented, the Owner
         shall give notice thereof to the Charterer and the Owner and the
         Charterer shall forthwith enter into negotiations in good faith with a
         view to agreeing upon an alternative jurisdiction for the
         documentation of the Ship as a British ship, but if no such agreement
         shall be reached within thirty (30) days after the Owner shall have
         given such notice to the Charterer, the Owner shall be at liberty to
         take and/or require the Charterer to take such action to re-document
         the Ship as a British ship at a port of registry in the United Kingdom
         or in any other relevant overseas territory and/or to transfer the
         registry of the Ship to a port of registry in the United Kingdom or in
         any other such relevant overseas territory and in either case the
         Charterer shall do all that may be necessary on each part to give
         effect to such re-documentation and/or transfer of register.

         Without prejudice to the generality of the provisions of Clause 9, the
         Charterer shall indemnify and hold harmless the Owner against all
         losses, costs, expenses and liabilities of whatsoever nature
         (including penalties, claims, demands, orders or judgments) which the
         Owner may suffer or incur and which arise directly or indirectly out
         of the documentation of the Ship under the laws of any jurisdiction at
         the request of the Charterer as aforesaid.

14.4     Name and House Flag

         The name of the Ship shall as from the Delivery Date remain unchanged
         or shall be such other name as the Charterer shall select and the Ship
         shall be painted in such colours, display such funnel insignia and fly
         such house flag as the Charterer may require. The Charterer shall
         notify the Owner of any intended change in the name of the Ship.

15       MAINTENANCE AND OPERATION

15.1     Possession and Control of Ship by Charterer

         During the Charter Period the Ship shall, subject to the terms and
         conditions of this Charterparty, be in the full and exclusive
         possession and at the absolute disposal of the Charterer for all
         purposes and under its complete control in every respect.





                                       31
<PAGE>   38
         Notwithstanding any other provision of this Charterparty, without
         prejudice to any of the obligations of the Charterer under this
         Charterparty or any of the other Relevant Documents imposing any
         higher standard of performance upon the Charterer, the Charterer shall
         make or procure to be made, and shall have sole responsibility for
         making or procuring to be made, all such arrangements as may be
         necessary to ensure that the Ship is fit to go to sea without serious
         danger to human life.

15.2     Undertakings concerning Maintenance and Operation

         The Charterer further undertakes with the Owner that throughout the
         Charter Period it will:

         (a)     Maintenance of Classification; Compliance with Regulations

                 maintain the Classification as the present class of the Ship
                 with the Classification Society and with such other
                 certificates required by statute and the Ship's insurers in
                 force at all times and so as to comply with the provisions of
                 all other regulations and requirements (statutory or
                 otherwise) from time to time applicable to vessels registered
                 at the Ship's port of registry or otherwise applicable to the
                 Ship, her Master, officers and crew wherever the Ship may
                 proceed or trade and (without prejudice to the generality of
                 the foregoing) at its own expense maintain in force for the
                 Ship all safety, radio, loadline and other certificates
                 whatsoever and all licenses and permits which may from time to
                 time be prescribed by any legislation in force in the United
                 Kingdom or other applicable jurisdiction;

         (b)     Supply and Crewing

                 ensure that at all times during the Charter Period the Ship is
                 properly manned, victualled, navigated, operated, supplied,
                 fuelled and repaired;

         (c)     Surveys

                 submit the Ship to continuous surveys and such periodical or
                 other surveys as may be required for classification purposes,
                 comply with all recommendations and requirements of the
                 Classification Society in accordance with their terms and,
                 upon the Owner's request, supply to the Owner copies of all
                 survey reports issued in respect thereof;

         (d)     Repair

                 keep the Ship and every part of her in a good and efficient
                 state of repair, in efficient operating condition, seaworthy
                 in all respects and in accordance with good maintenance
                 practice (fair wear and tear excepted and having regard to the
                 type and age of the Ship) and procure that all repairs to, or
                 replacement of, any





                                       32
<PAGE>   39
                 damaged, worn or lost parts or equipment are effected in such
                 manner (both as regards workmanship and quality of materials)
                 as not to diminish the value of the Ship;

         (e)     Drydocking

                 drydock the Ship and clean and paint her underwater parts in
                 accordance with good commercial practice for vessels of the
                 type and age of the Ship;

         (f)     Inspection of the Ship

                 permit the Owner by surveyors or other persons appointed by it
                 for such purpose to board the Ship at all reasonable times for
                 the purpose of inspecting her and to afford all proper
                 facilities for such inspections and for this purpose to give
                 the Owner on request reasonable advance notice of any intended
                 drydocking of the Ship (whether for the purpose of
                 classification, survey or otherwise). The cost of any such
                 inspection and survey shall be paid by the Charterer. All time
                 taken in respect of such inspection or survey shall form part
                 of the Charter Period. Inspection or survey of the Ship in
                 drydock shall be made only when the Ship shall be in drydock
                 for the purpose of the surveys referred to in Clause 15.1(e);

         (g)     Manuals and Technical Records

                 maintain all such other records, logs, manuals, technical data
                 and other materials and documents which are required to be
                 maintained in respect of the Ship to comply with any
                 applicable laws or the requirements of the Classification
                 Society and, keep accurate, complete and up to date logs and
                 records of all voyages made by the Ship and of all
                 maintenance, repairs, alterations, modifications and additions
                 to the Ship and, on reasonable advance notice from the Owner
                 permit the Owner or its representatives at any time to examine
                 and take copies of such logs and records and other records;

         (h)     Modification; Removal of Parts;
                 Equipment owned by Third Parties

                 not without the prior written consent of the Owner (and then
                 only on and subject to such terms as the Owner may agree):

                 (i)      make any modification to the Ship in consequence of
                          which her structure, type or performance
                          characteristics could or might be materially altered
                          or her value materially reduced; or

                 (ii)     remove any material part of the Ship or any equipment
                          the value of which is such that its removal from the
                          Ship would materially reduce the value





                                       33
<PAGE>   40
                          of the Ship without replacing the same with
                          equivalent parts or equipment which are owned by the
                          Owner free from Encumbrances (other than Permitted
                          Encumbrances); or

                 (iii)    install on the Ship any equipment owned by a third
                          party which cannot be removed without causing damage
                          to the structure or fabric of the Ship;

         (i)     Manager

                 not without the previous consent in writing of the Owner
                 (which shall not be unreasonably withheld) and subject to such
                 terms as the Owner may require (including approval of the new
                 manager and the terms of any Management Agreement), appoint
                 any manager of the Ship other than the Manager or to terminate
                 or amend the terms of the Management Agreement (and for the
                 purposes of this Charterparty "Manager" shall include any ship
                 manager or other person providing to the Charterer analogous
                 specialised services in respect of the Ship);


         (j)     Notification of certain Events

                 notify the Owner forthwith by telex of

                 (i)      any damage to the Ship requiring repairs the cost of
                          which Drill or might exceed the Casualty Amount and
                          furnish the Owner with full information regarding any
                          single casualty or other accident or damage to the
                          Ship which may involve repairs costing more than the
                          Casualty Amount;

                 (ii)     any occurrence in consequence of which the Ship has
                          or may become a Total Loss;

                 (iii)    any requisition of the Ship for hire;

                 (iv)     any requirement or recommendation made by any insurer
                          or the Classification Society or by any competent
                          authority which is not complied with in accordance
                          with its terms;

                 (v)      any serious injury to a third party caused by, or in
                          connection with, the Ship;

                 (vi)     any substantial damage to property caused by, or in
                          connection with the Ship;





                                       34
<PAGE>   41
                 (vii)    any assistance which has been given to the Ship which
                          has resulted or may result in a lien for salvage
                          being acquired over the Ship; and

                 (viii)   any other event which occurs in connection with the
                          Ship which affects or might affect the rights of the
                          Owner or involves any material loss or liability;

         (k)     Repairers' Liens

                 other than pursuant to the Conversion and Supply Agreement,
                 not without the previous consent in writing of the Owner
                 (which shall not be unreasonably withheld but which may be
                 given only on and subject to such terms as the Owner may
                 agree) put the Ship into the possession of any person for the
                 purpose of work being done upon her in an amount exceeding or
                 likely to exceed the Casualty Amount unless such person shall
                 first have given to the Owner and in terms satisfactory to it,
                 a written undertaking not to exercise any lien on the Ship for
                 the cost of such work or otherwise;

         (l)     Health and Safety

                 take such steps as are reasonably practicable to ensure that
                 the Ship and all constituent parts thereof will be safe and
                 without risk to health when properly used and specifically
                 (without prejudice to the generality of the foregoing) that it
                 will:

                 (i)      take such steps as are reasonably practicable to
                          ensure that any defects in the Ship and all
                          constituent parts thereof which could be or cause a
                          danger to safety and a risk to health shall be made
                          good;

                 (ii)     for such purpose, have a detailed inspection of the
                          Ship carried out from time to time including all
                          electrical, fluid, oil and gas connections (being
                          either supplies to or discharges from the Ship) and
                          all constituent parts thereof as well as all life
                          saving and other safety equipment;

                 (iii)    take such action as is reasonably practicable to see
                          that appropriate safety measures are adopted; and

                 (iv)     not use or permit the Ship or any constituent parts
                          thereof to be used beyond their limits and
                          capacities;

         (m)     No Operational Interest

                 procure that the Owner is not at any time represented as
                 carrying goods or passengers or providing any other service on
                 or from the Ship, or as being in any





                                       35
<PAGE>   42
                 way connected or associated with any operation of carriage or
                 other service which may be undertaken by the Charterer, or as
                 having any operational interest in, or responsibility for, the
                 Ship;

         (n)     Safe Operation

                 take all reasonable steps to secure that the Ship is navigated
                 and operated in a proper, safe and seaman-like manner; and

         (o)     Fitness to go to Sea

                 shall procure that the Ship shall at all times be fit to go to
                 sea without serious danger to life (by reason of the
                 condition, or the unsuitability for its purpose, of either the
                 Ship or its machinery or equipment or any part of the Ship or
                 its machinery or equipment or undermining or overloading or
                 unsafe or improper loading or any other matter relevant to the
                 safety of the Ship) unless arrangements have been made which
                 are appropriate to ensure that before the Ship goes to sea it
                 is made fit to do so without serious danger to human life by
                 reason of any such matters or it is reasonable for such
                 arrangements not to be made at such time.

16       INSURANCE UNDERTAKINGS; WRECK REMOVAL AND INSURANCE ASSIGNMENT

16.1     Insurance Undertakings

         The Charterer hereby covenants with the Owner and undertakes that
         throughout the Charta Period and thereafter until sale of Ship
         pursuant to any provision of this Charterparty it will:

         (a)     Insured Risks

                 insure and keep the Ship insured free of cost and expense to
                 the Owner and in the joint names of the Charterer and the
                 Owner (but without liability on the part of the Owner for
                 premiums or calls) and, at the request of the Charterer, the
                 Manager or other third party providing specialist services to
                 the Charterer in connection with the operation of the Ship
                 (each as their interests may appear):

                 (i)      against fire and usual marine risks (including excess
                          risks) and war risks, on an agreed value basis, in
                          such amounts (but not in any event less than
                          whichever shall be the greater of the market value of
                          the Ship for the time being and One hundred and ten
                          per cent (110%) of the maximum Termination Sum
                          applicable during the period of the policy) and upon
                          such terms as shall from time to time be approved in
                          writing by the Owner;





                                       36
<PAGE>   43
                 (ii)     against protection and indemnity risks (including
                          pollution risks) for the full value and tonnage of
                          the Ship in a protection and indemnity association
                          (as approved in writing by the Owner) for a full and
                          unlimited entry (other than for oil pollution risks
                          which shall be for a minimum sum of U.S.$500,000,000
                          or equivalent thereof) and upon such terms as shall
                          from time to time be approved in writing by the
                          Owner; and

                 (iii)    in respect of such other matters of whatsoever nature
                          and howsoever arising in respect of which insurance
                          would be maintained by a prudent owner of the Ship
                          having regard to the financial resources and
                          liabilities of the Charterer and to the situation and
                          method of operation of the Ship;

         (b)     Brokers and Insurers

                 effect the insurances aforesaid in Pounds or such other
                 currency as the Owner may approve and through the Approved
                 Brokers and with such insurance companies and/or underwriters
                 as shall from time to time be approved in writing by the Owner
                 provided however that the insurances against war rusks and
                 protection and indemnity risks may be effected by the entry of
                 the Ship with such war risks and protection and indemnity
                 associations as shall from time to time be approved in writing
                 by the Owner;

         (c)     Fleet Cover

                 if any of the insurances referred to in Clause 16.1 (a) form
                 part of a fleet cover, procure that the Approved Brokers
                 and/or insurers and protection and indemnity or war risks
                 associations (as appropriate) shall undertake to the Owner
                 that they shall neither set off against any claims in respect
                 of the Ship any premiums due in respect of other vessels under
                 such fleet cover or any premiums due for other insurances, nor
                 cancel the insurance for reason of non-payment of premiums
                 other vessels under such fleet cover or of premiums for such
                 other insurances, and shall undertake to issue a separate
                 policy in respect of the Ship if and when so requested by the
                 Owner;

         (d)     Payment of Premiums

                 punctually pay all premiums, calls, contributions or other
                 sums payable in respect of all such insurances and to produce
                 all relevant receipts or other evidence of payment when so
                 required by the Owner;

         (e)     Renewal

                 at least 14 days before the relevant policies, contracts or
                 entries expire, notify the Owner of the names of the brokers
                 and/or the war risks and protection and





                                       37
<PAGE>   44
                 indemnity risks associations proposed to be employed by the
                 Charterer for the purposes of the renewal of such insurances
                 and of the amounts in which such insurances are proposed to be
                 renewed and the risks to be covered and, subject to compliance
                 with any requirements of the Owner pursuant to this Clause
                 16.1 procure that appropriate instructions for the renewal of
                 such insurances on the terms so specified are given to the
                 Approved Brokers and/or to the approved war risks and
                 protection and indemnity risks associations at least ten (10)
                 days before the relevant policies, contracts or entries
                 expire, and that the Approved Brokers and/or the approved war
                 risks and protection and indemnity risks associations will at
                 least seven (7) days before such expiry (or within such
                 shorter period as the Owner may from time to time agree)
                 confirm in writing to the Owner as and when such renewals have
                 been effected in accordance with the instructions so given;

         (f)     Guarantees

                 arrange for the execution and delivery of such guarantees or
                 indemnities as may from time to time be required by any
                 protection and indemnity or war risks association;

         (g)     Custody of Policy Documents; Letters of Undertaking; Loss
                 Payable Clauses

                 deposit with the Approved Brokers (or procure the deposit of
                 all slips, cover notes, policies, certificates of entry or
                 other instruments of insurance from time to time issued in
                 connection with such of the insurances referred to in Cause
                 16.1(a) as are effected through the Approved Brokers and
                 procure that the interest of the Owner shall be endorsed
                 thereon by incorporation of the relevant Loss Payable Clause
                 and that the Owner shall be furnished with pro forma copies
                 thereof and a letter or letters of undertaking from the
                 Approved Brokers in such form as shall from time to time be
                 required by the Owner;

         (h)     Club Letters of Undertaking; Certificates of Entry

                 procure that any protection and indemnity and/or war risks
                 associations in which the Ship is for the time being entered
                 shall endorse the relevant Loss Payable Clause on the relevant
                 certificate of entry or policy and shall furnish the Owner
                 with a copy of such certificate of entry or policy and a
                 letter or letters of undertaking in such form as shall from
                 time to time be required by the Owner;

         (i)     Broker's Report

                 if so requested by the Owner but at the cost of the Charterer
                 (except where the insurances maintained on the Ship have not
                 been changed since the time of the last such report), furnish
                 the Owner from tune to time with a detailed report





                                       38
<PAGE>   45
                 signed by an independent firm of marine insurance brokers
                 appointed by the Owner dealing with the insurances maintained
                 on the Ship and stating the opinion of such firm as to the
                 adequacy thereof,

         (j)     Collection

                 do all things necessary and provide all documents, evidence
                 and information to enable the Owner to collect or recover any
                 moneys which shall at any time become due in respect of the
                 Insurances;

         (k)     Compliance with Insurances

                 comply with the terms and conditions of the Insurances, not
                 do, consent to or permit any act or omission which might
                 invalidate or render unenforceable the whole or any part of
                 the Insurances and not (without first obtaining the consent of
                 the insurers to such employment and complying with such
                 requirements as to extra premium or otherwise as the insurers
                 may prescribe) employ the Ship or suffer the Ship to be
                 employed otherwise than in conformity with the terms of the
                 Insurances (including any warranties express or implied
                 therein);

         (l)     Application of Recoveries

                 apply all sums receivable under the Insurances which are paid
                 to the Charterer in accordance with the Loss Payable Clauses
                 and Clause 21 in repairing all damage and/or in discharging
                 the liability in respect of which such sums shall have been
                 received;

         (m)     Other Insurances and Assureds

                 not, without the prior written consent of the Owner, take out
                 additional insurances for the Charterer's sole benefit, or
                 permit the Charterer or the Owner or any other person to be
                 named insured in insurances with respect to the Ship, other
                 than as required under this Charterparty or the Conversion and
                 Supply Agreement where such additional insurances will or may
                 prejudice the Insurances or recovery thereunder or will exceed
                 the amount permitted by the warranties or other conditions of
                 the Insurances (unless the insurers under the Insurances have
                 consented thereto) and will, upon the Owner's request,
                 immediately furnish the Owner with particulars of any such
                 additional insurances (including copies of any cover notes or
                 policies) and of the written consent of the insurers under the
                 Insurances in any case where such consent is necessary;





                                       39
<PAGE>   46
         (n)     Information concerning Insurances

                 supply to the Owner all necessary information, documentation
                 and assistance which may be required by the Owner in
                 connection with making any claim under the Insurances.

         Provided however that if, in the event of requisition of the Ship for
         hire, it is proved to the satisfaction of the Owner that such
         requisition is upon terms whereby the requisitioning authority has
         assumed the responsibility of the Charterer to the Owner to indemnify
         or recompense it in respect of or otherwise to make good all losses
         which would ordinarily be covered by the insurances required to be
         effected by the Charterer under this Charterparty, the Charterer shall
         be relieved from its insurance obligations under this Charterparty in
         respect of such period of requisition or in the event that the
         requisitioning authority shall have assumed only a partial
         responsibility as aforesaid the insurance obligations of the Charterer
         under this Charterparty shall be modified in such manner and to such
         extent as the Owner may approve.

16.2     Wreck Removal

         In the event of the Ship becoming a wreck or obstruction to navigation
         the Charterer shall (in addition to any other obligation it may have
         under Clause 9 to indemnify and hold harmless the Owner as therein
         provided) indemnify and hold harmless the Owner against all costs,
         expenses, payments, charges, losses, demands, any liabilities, claims,
         actions, proceedings (whether civil or criminal), penalties, fines,
         damages, judgments, orders or other sanctions which may be incurred,
         by, or made or asserted against the Owner by reason that the Ship
         shall have become a wreck or obstruction to navigation (including,
         without limitation) in respect of the removal or destruction of the
         wreck or obstruction under statutory powers but only to the extent
         that such has not been recovered from the Ship's insurers.

16.3     Further Requirements

         Notwithstanding the other provisions of this Clause 16, the Charterer
         shall comply with such further reasonable requirements relative to
         insurance (and if applicable any requirements relative to reinsurance)
         as the Owner may from time to time request.

16.4     Insurance Assignment

         As continuing security for the payment of all sums due and payable to
         the Owner by the Charterer under or pursuant to this Charterparty and
         the other Relevant Documents, the Charterer as beneficial owner
         assigns and agrees to assign to the Owner all its right, title and
         interest in and to the Insurances and any Requisition Compensation and
         agrees and undertakes to do all that may be necessary (by covey of
         giving notice, lending its name to any action or otherwise howsoever)
         to enable the Owner to perfect and/or enjoy the





                                       40
<PAGE>   47
         full benefits of such assignment. The Owner shall re-assign to the
         Charterer the property so assigned upon receipt by the Owner of all
         such sums and provided the Charter Period shall have ended.

17       POWERS OF OWNER TO REMEDY DEFAULTS

17.1     Failure to Perform Insurance Undertakings

         If the Charterer fails to comply with any of the provisions of Clause
         16.1, the Owner may, without being in any way obliged so to do, or
         responsible for so doing, and without prejudice to the ability of the
         Owner to treat that non-compliance as a Termination Even, to effect
         and thereafter to maintain all such insurances upon the Ship as in its
         discretion it may think fit in order to procure the compliance with
         such provisions or alternatively, to require the Ship (at the
         Charterer's risk) to remain in, or to proceed to and remain in a port
         designated by the Owner until such provisions are fully complied with.

17.2     Failure to Perform Maintenance Undertakings

         If the Charterer fails to comply with any of the provisions of Clauses
         15.2(a), (c), (d) or (e), the Owner may, without being in any way
         obliged so to do, or responsible for so doing, and without prejudice
         to the ability of the Owner to treat that non-compliance as a
         Termination Event, to arrange for the carrying out of such repairs,
         changes or surveys as it may deem expedient or necessary in order to
         procure the compliance with such provisions.

17.3     Failure to Prevent or Release from Arrest

         If the Charterer fails to comply with any of the provisions of Clause
         11.2(d) the Owner may, without being in any way obliged so to do, or
         responsible for so doing, and without prejudice to the ability of the
         Owner to treat that non-compliance as a Termination Event, pay and
         discharge all such debts, damages, liabilities and outgoings as are
         therein mentioned and/or take any such measures as it may deem
         expedient or necessary for the purpose of securing the release of the
         Ship in order to procure the compliance with such provisions.

17.4     Failure to comply with other Obligations

         If the Charterer fails to comply with any of its other obligations
         under this Charterparty or any of the other Relevant Documents, the
         Owner may, without being in any way obliged to do so or responsible
         for so doing, and without prejudice to the ability of the Owner to
         treat that non-compliance as a Termination Event, take such action as
         it may deem expedient or necessary in order to procure the compliance
         with such provisions.





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<PAGE>   48
17.5     Costs of Remedying Defaults

         Without prejudice to Clause 25.1, all losses, liabilities, costs,
         charges, expenses, damages and outgoings of whatsoever nature
         (including, without limitation, Taxes, repair costs, registration fees
         and insurance premiums) suffered, incurred or paid by the Owner in
         connection with the exercise by the Owner of any of its powers under
         Clauses 17.1, 17.2, 17.3 and 17.4 and interest on all such losses,
         liabilities, costs, charges, expenses, damages and outgoings from the
         date on which the same were suffered, incurred or paid by the Owner
         until the date of receipt or recovery thereof (both before and after
         any relevant judgement) at the Relevant Rate of Interest shall be
         repayable by the Charterer to the Owner on demand.

17.6     Hire Still Payable

         Notwithstanding any exercise by the Owner of any of the powers
         contained in this Clause 17, charterhire shall continue to accrue
         during such time.

18       REDELIVERY

18.1     Redelivery Procedure and Condition

         Except in the event of a Total Loss of the Ship and subject to the
         provisions of Clause 23.5, the Charterer shall at the end of the
         Charter Period redeliver the Ship to the Owner free of all
         Encumbrances (other than Permitted Encumbrances), and the Owner shall
         accept such redelivery, at a safe port to be mutually agreed between
         the parties or, in the absence of such agreement, at such nearby safe
         port in the United Kingdom as the Owner may require. Subject to the
         provisions of Clause 23.5, the Charterer shall at its expense before
         such redelivery make all such repairs and do all such work as may be
         necessary so that the Ship at the date of redelivery shall have
         installed the machinery and other equipment installed on the Ship at
         Delivery or, after redelivery from the Yard pursuant to the MWB
         Conversion Contract, as on redelivery from the Yard or replacements
         for the same made in accordance with the provisions of this
         Charterparty, shall maintain the Classification unexpired and shall be
         in as good structure, state and condition as at Delivery or, after
         redelivery from the Yard pursuant to the MWB Conversion Contract, as
         on redelivery from the Yard, fair wear and tear and changes and
         alterations properly made by the Charterer as permitted under this
         Charterparty excepted.

18.2     Redelivery Survey

         At or about the time of redelivery a survey shall, if the Owner so
         requires, be made to determine the state and condition of Me Ship, her
         machinery and equipment. In that event, the Charterer and the Owner
         shall each appoint surveyors to be present at such survey and the
         surveyors present shall determine the condition of the Ship, her
         machinery and equipment and shall state the repairs or work necessary
         to place the Ship at the date





                                       42
<PAGE>   49
         of redelivery in the structure state, condition and classification
         referred to in Clause 18.1. If the said surveyors disagree they shall
         refer the matter to a senior surveyor of the Classification Society
         whose decision shall be final and binding on the parties hereto. All
         reasonable costs occasioned by any such survey including the costs of
         the said surveyors appointed by the Charterer and the Owner and, if
         appointed, the costs of the senior surveyor of the Classification
         Society shall be payable by the Charterer but if the Ship is found to
         be in the condition provided for Clause 18.1 fair wear and tear and
         changes and alterations properly made by the Charterer as permitted
         under this Charterparty excepted, such cost shall be payable by the
         Owner.

19       CONSUMABLE STORES

19.1     Upon Delivery

         It is acknowledged and agreed that all consumable stores, unused
         diesel and lubricating oils and bunkers on board the Ship at Delivery
         belong to the Charterer.

19.2     Upon Redelivery

         All consumable stores, unused diesel and lubricating oils and bunkers
         on board the Ship at the time of re-delivery shall be purchased by the
         Owner from the Charterer and sold by the Owner to the purchaser of the
         Ship. The price payable by the Owner to the Charterer shall be the
         same as that received from the said purchaser of the Ship.

20       USE OF EQUIPMENT AND REPLACEMENT

20.1     Use of Equipment and Manuals and Technical Records

         The Charterer shall have the use of all outfit, equipment (including
         cabin, crew and galley equipment), furnishings, furniture and
         fittings, spare and replacement parts which are the property of the
         Owner on board the Ship at the time of Delivery or installed on the
         Ship pursuant to the Conversion and Supply Agreement and as
         redelivered by the Yard pursuant to the MWB Conversion Contract and
         the Manuals and Technical Records and the same or their substantial
         equivalent shall be returned to the Owner on redelivery in good order
         and condition fair wear and tear alone and changes and alterations
         properly made by the Charterer as permitted under this Charterparty
         excepted.

20.2     Renewal of Equipment

         The Charterer shall at its own expense from time to time during the
         Charter Period replace, renew or obtain substitutes for such items of
         equipment as shall be so damaged or worn as to be unfit for use
         provided always that in any such case title to any part replaced,
         renewed or substituted shall remain with the Owner until the part
         which replaced it or the new or substituted part becomes the property
         of the Owner or is





                                       43
<PAGE>   50
         replaced, renewed or substituted by a part which thereupon becomes the
         property of the Owner and the Charterer agrees that if any replaced,
         renewed or substituted part is not the property of the Owner it will
         as soon as practicable replace the same with a part which thereupon
         becomes the properly of the Owner.

20.3     Alteration of Equipment; Additional Equipment

         The Charterer may at any time alter or remove all or any items of
         equipment or may fit any additional equipment required to render the
         Ship available for any purpose for which the Charterer may require to
         use her under the provisions of Clause 13 provided that the Charterer
         shall first have obtained the prior written consent of the Owner
         thereto if and to the extent such consent may be required pursuant to
         Clause 15.2(h). Any additional equipment so fitted by the Charterer
         shall be considered the property of the Charterer who may remove such
         additional equipment and/or any Excluded Equipment at any time before
         the expiration of the Charter Period. The cost of fitting or removing
         any equipment together with the cost of making good any damage caused
         by such fitting or removal shall be payable in full by the Charterer
         who shall redeliver the Ship's equipment to the Owner in accordance
         with the provisions of Clause 20.1 unless it is agreed between the
         Owner and the Charterer that any extra fittings or equipment which
         have been supplied by the Charterer during the Charter Period shall
         remain on the Ship after redelivery in which event such fittings or
         equipment shall as from redelivery become the property of the Owners.

21       LOSS AND DAMAGE


21.1     Notwithstanding Clause 6.1, the Ship shall throughout the Charter
         Period be in every respect at the risk of the Charterer who shall bear
         all risks howsoever arising whether of navigation, operation and
         maintenance of the Ship or otherwise and of any other occurrence of
         whatever kind which shall deprive the Charterer of the use, possession
         or enjoyment thereof provided however that nothing in this Clause 21.1
         shall restrict any claim by the Charterer against the Owner for any
         default of the Owner in respect of its obligations under Clause 6.1.

21.2      (a)    If the Ship shall become a Total Loss during the Charter
                 Period, the Charterer shall pay, or procure that the insurers
                 pay, to the Owner within one hundred and twenty (120) days (or
                 such longer period as may be agreed) of the Total Loss Date,
                 the Termination Sum as at the Total Loss Date together with
                 interest thereon calculated at the Relevant Rate of Interest
                 from the Total Loss Date to the date of payment and together
                 with all amounts of charterhire and any other amounts then due
                 and payable under this Charterparty and the other Relevant
                 Documents.





                                       44
<PAGE>   51
         (b)     For the purposes of this Charterparty a Total Loss shall be
                 deemed to have occurred on the following date ("Total Loss
                 Date"):

                 (i)      in the case of an actual total loss, at noon (London
                          time) on the actual date the Ship was lost, or if
                          such date is not known, noon (London time) on the day
                          on which the Ship was last reported;

                 (ii)     in the case of a constructive total loss of the Ship,
                          upon the date and at the time notice of abandonment
                          of the Ship is given to the insurers of the Ship for
                          the time being (provided a claim for such
                          constructive total loss is admitted by the insurers)
                          or, if the insurers do not admit such a claim at the
                          date and time at which a constructive total loss is
                          subsequently adjudged by a competent court of law to
                          have occurred;

                 (iii)    in the case of a compromised or arranged total loss,
                          at the date upon which a binding agreement as to such
                          compromised or arranged total loss has been entered
                          into by the insurers of the Ship;

                 (iv)     in the case of Compulsory Acquisition, upon the date
                          upon which the relevant compulsory acquisition,
                          requisition, appropriation, expropriation,
                          deprivation or confiscation occurs; and

                 (v)      in the case of any of the events described in sum
                          paragraph (c) of the definition of Total Loss, upon
                          the expiry of the period of thirty (30) days referred
                          to in such sub-paragraph (c) after the date upon
                          which the relevant hijacking, theft, condemnation,
                          confiscation, capture, detention, seizure or
                          requisition for use or hire occurred.

21.3     The Charter Period shall terminate on the Total Loss Date and, subject
         to the payment by the Charterer to the Owner of all amounts of
         charterhire then due and payable under this Charterparty, the
         Charterer shall cease to be under any liability to pay charterhire
         (but not any other amounts) thereafter becoming due and payable under
         this Charterparty or any of the other Relevant Documents.

21.4     In the event of the Compulsory Acquisition of the Ship after Delivery,
         all Requisition Compensation received by the Owner shall be applied by
         the Owner (or, if receded by the Charterer, shall be held in trust by
         the Charterer for application) in accordance with Clause 21.5.

21.5     All moneys received by the Owner as loss payee under the Insurances
         from insurers or others in respect of a Total Loss shall be applied by
         the Owner subject to Clause 10.4 as follows:





                                       45
<PAGE>   52
         (a)     Firstly, in or towards settlement of any amounts due and owing
                 by the Charterer to the Owner under this Charterparty or any
                 of the other Relevant Documents;

         (b)     Secondly, if the Charterer shall on or before the date of
                 application of such moneys have paid the Termination Sum, or a
                 part thereof, in accordance with Clause 21.2 (a) in or towards
                 refunding by way of rebate of hire or otherwise as appropriate
                 to the Charterer the amount of the Termination Sum or part
                 thereof so paid by the Charterer, and

         (c)     Thirdly, an amount equal to two per cent. (2%) of such moneys
                 received by the Owner as loss payee under the Insurances shall
                 be retained by the Owner, and the balance shall be paid to the
                 Charterer or to its order by way of rebate of charterhire or
                 otherwise as appropriate.

21.6     In the event of repairable damage to the Ship, the Owner as loss payee
         under the Insurances shall pay any insurance moneys received by it to
         the Charterer upon the Charterer furnishing evidence to the Owner that
         such damage has been made good or repaired or put in hand for repair
         Provided always that if a Relevant Event has occurred and is
         continuing, the Owner shall be entitled to require that such insurance
         moneys be applied in or towards settlement of any amounts owing by the
         Charterer to the Owner under this Charterparty or any of the Relevant
         Documents.

21.7     Any insurance moneys paid under the insurance taken out or entries
         made referred to in Clause 16.1 (a) (ii) shall be paid to the person
         to whom the liability (or alleged liability) covered by such
         insurances or entry was incurred or if the liability (or alleged
         liability) to such person has previously been discharged by the
         Chatterer, such moneys shall be paid to the Charterer in reimbursement
         of the moneys so expended by it in satisfaction of such liability or
         alleged liability and, in such case, the Owner shall pay any insurance
         moneys received by it in respect of such liability or alleged
         liability to the Charterer upon the Charterer furnishing evidence to
         the Owner that such liability or alleged liability has previously been
         discharged provided always that if a Relevant Event has occurred and
         is continuing, the Owner shall be entitled to apply such insurance
         moneys in or towards settlement of any amounts due and owing by the
         Charterer to the Owner under this Charterparty or any of the other
         Relevant Documents.

21.8     In the event of repairable damage to the Ship or a liability or
         alleged liability covered by the insurances taken out or entries made
         referred to in Clause 16.1 (a) being incurred or alleged, and if the
         insurance moneys paid in respect thereof are insufficient to pay the
         cost or estimated cost of making good or repairing such damage or
         discharging the liability or alleged liability, the Charterer will pay
         the deficiency.

21.9     (a)     The Charterer shall have the sole right to determine whether
                 or not a case has arisen for the giving of notice of
                 abandonment to abandon the Ship to the insurers





                                       46
<PAGE>   53
                 and/or claim a constructive total loss and the Charterer is
                 hereby irrevocably authorised by the Owner to give the same if
                 it so determines.

         (b)     The Owner shall upon the request of the Charterer promptly
                 execute such documents as may be required to enable the
                 Charterer to abandon the Ship to the insurers and/or claim a
                 constructive total loss and the Owner shall give the Charterer
                 all possible assistance in pursuing the said claim.

21.10    Any moneys payable under the Insurances shall be payable in accordance
         with the terms of the relevant Loss Payable Clause and, unless and
         until a Relevant Event shall occur (whereupon all insurance recoveries
         shall be receivable by the Owner and applied in accordance with the
         foregoing provisions of this Clause 21), the Owner shall not give any
         notice or direction to the contrary to the insurers as contemplated by
         the Loss Payable Clauses.

21.11    If the insurers of the Ship have satisfied or admitted in full their
         obligations under the Insurances and have expressly waived any rights
         they may have, or would or might acquire, in the Ship, the Owner shall
         as soon as practicable after the date of Total Loss of the Ship
         endeavour to sell the Ship, to the extent that the Owner retains title
         therein. Any such sale shall comply with Clauses 3.5 and 3.6.

22       SALVAGE

22.1     All salvage and towage and all proceeds from derelicts shall, subject
         to the Owner's prior right to retain thereout any sums which may be
         due from the Charterer to the Owner under this Charterparty or any of
         the other Relevant Documents, be for the Charterer's benefit and the
         cost of repairing damage occasioned thereby shall be borne by the
         Charterer.


23       REQUISITION

23.1     If the Ship is requisitioned for hire by any Government Entity or
         other competent authority during the Charter Period then, unless and
         until the Ship becomes a Total Loss following such requisition and the
         Charterer shall have made payment of all sums due pursuant to Clause
         21.2 (a), the charter of the Ship to the Charterer under this
         Charterparty shall continue in full force and effect (subject always
         to the provisions of Clause 25) for the remainder of the Charter
         Period and the Charterer shall remain fully responsible for the due
         compliance with all its obligations under this Charterparty other than
         such obligations which the Charterer is unable to comply with solely
         by virtue of such requisition.

23.2     If the Charterer shall duly comply with all its obligations under this
         Charterparty, save as mentioned in Clause 23.1, the Charterer shall
         during the Charter Period, be entitled





                                       47
<PAGE>   54
         to all requisition hire paid to the Owner or to the Charterer on
         account of such requisition.

23.3     The Charterer shall as soon as practicable after the end of any
         requisition for hire, cause the Ship to be put into the condition
         required by this Charterparty, and where that requisition shall end
         after the expiry or termination of the Charter Period, the Charterer
         shall, as soon as practicable, cause the Ship to be put into the
         redelivery condition required by Clause 18, allowance being made for
         fair wear and tear in respect of the period from the expiry or
         termination of the Charter Period.

23.4     The Owner shall be entitled to all compensation payable in respect of
         any change in the structure, state or condition of the Ship arising
         during the period of requisition for hire. The Owner shall apply such
         compensation in reimbursing the Charterer for the cost of complying
         with its obligations under Clause 23.3, provided always that if a
         Relevant Event has occurred and is continuing, the Owner shall be
         entitled to apply such compensation in or towards settlement of any
         amounts owing by the Charterer under this Charterparty and any of the
         other Relevant Documents.

23.5     Should the Ship be under requisition for hire at the end of the
         Charter Period:

         (a)     the charter of the Ship under this Charterparty shall (unless
                 otherwise agreed between the parties hereto) nevertheless be
                 terminated at such end but without prejudice to the accrued
                 rights of the parties, including, without prejudice to the
                 generality of the foregoing, the obligations of the Charterer
                 contained in Clause 23.3, and the Owner shall be entitled to
                 receive and retain any requisition hire payable in respect of
                 the period from the expiry or termination of the Charter
                 Period;

         (b)     the Charterer shall if it is prevented by reason of the
                 requisition for hire from redelivering the Ship under Clause
                 18, be relieved from its obligations so to do, but shall
                 consult with the Owner as to the most convenient method of
                 enabling the Owner to obtain redelivery of the Ship when the
                 Ship is released from such requisition; and

         (c)     after such release the Charterer shall be given a reasonable
                 opportunity of removing the Excluded Equipment and any
                 additional equipment as is referred to in Clause 20.3 on the
                 terms therein referred.

23.6     If the Ship shall be requisitioned for hire upon terms whereby the
         Charterer is not relieved from its insurance obligations pursuant to
         the proviso to Clause 16.1, insurance recoveries in respect of all
         claims whatsoever (otherwise than in respect of a Total Loss) arising
         during the period or requisition shall (to the extent to which such
         recoveries have not been expended by the Charterer in repairs to the
         Ship) at the end of the Charter Period be paid to the Owner and in
         respect of any amount so paid the Charterer shall to





                                       48
<PAGE>   55
         that extent be relieved from its obligations under the last sentence
         of Clause 18.1 and under Clause 20.3.

24       TERMINATION EVENTS

24.1     If the Charterer commits a repudiatory breach of any Relevant Document
         or the Guarantor commits a repudiatory breach of the Guarantee the
         Owner may accept such breach as repudiation of this Charterparty.

24.2     Without prejudice to the generality of Clause 24.1 the Owner and the
         Charterer agree that it is a fundamental term and condition of this
         Charterparty that none of the following events shall occur during the
         Charter Period and that the occurrence of any of the following events
         shall constitute a repudiatory breach of this Charterparty

         (a)     any Relevant Party fails to pay any sum payable by it under
                 any of the Relevant Documents when due or on demand within
                 five (5) Banking Days of such due date or date of demand (as
                 the case may be); or

         (b)     the Charterer fails to obtain and/or maintain the Insurances
                 or if any insurer in respect of any part of the Insurances
                 cancels any part of the Insurances or disclaims or repudiates
                 liability by reason, in either case, of any mis-statement in
                 any proposal for the Insurances or for any other failure or
                 default on the part of the Charterer, or

         (c)     any Relevant Party commits any breach of or omits to observe
                 any of the obligations or undertakings expressed to be assumed
                 by it under any of the Relevant Documents (other than those
                 referred to in sub-clauses (a) and (b) above) and in respect
                 of any such breach or omission which in the opinion of the
                 Owner is capable of remedy, such action as the Owner may
                 require shall not have been taken within fourteen (14) days of
                 the Owner notifying any Relevant Party of such default and of
                 such required action;

         (d)     any representation or warranty made or deemed to be made or
                 repeated by any Relevant Party in or pursuant to any of the
                 Relevant Documents or any document, certificate or statement
                 referred to in or delivered under any of the Relevant
                 Documents is or proves to have been incorrect in arty material
                 respect when made or deemed repeated; or

         (e)     any Indebtedness of any Relevant Party becomes due or capable
                 of being declared due prior to the date when it would
                 otherwise have become due whether or not such breach or
                 default shall be waived by the person to whom the same is
                 payable or is not paid on the due date and in the opinion of
                 the Owner the ability of any Relevant Party to perform all or
                 any of its obligations under, or otherwise to





                                       49
<PAGE>   56
                 comply with the terms of any Relevant Documents shall or may
                 reasonably be expected to be materially adversely prejudiced
                 as a consequence thereof; or

         (f)     any consent, authorisation, licence or approval of or
                 registration with or declaration to governmental or public
                 bodies or authorities or courts required by any Relevant Party
                 to authorise, or required by any Relevant Party in connection
                 with, the execution, delivery, validity, enforceability or
                 admissibility in evidence of any of the Relevant Documents or
                 the performance by any Relevant Party of its obligations under
                 any of the Relevant Documents is modified in a manner
                 unacceptable to the Owner or is not granted or is revoked or
                 terminated or expires and is not renewed or otherwise ceases
                 to be in full force and effect; or

         (g)     a creditor attaches or takes possession of, or a distress,
                 execution, sequestration or other process is levied or
                 enforced upon or sued out against any of the undertakings,
                 assets, rights or revenues of any Relevant Party and is not
                 discharged within seven days; or

         (h)     any Relevant Party suspends payment of its debts or becomes or
                 is deemed to be insolvent or unable to pay its debts within
                 the meaning of Section 123 of the Insolvency Act 1986 as they
                 fall due or commences negotiations with one or more of its
                 creditors with a view to the general re-adjustment or
                 re-scheduling of all or part of its Indebtedness or proposes
                 or enters into any composition or other arrangement for the
                 benefit of its creditors generally or any class of creditors
                 or proceedings are commenced in relation to any Relevant Party
                 under any law, regulation or procedure relating to
                 reconstruction or readjustment of debts; or

         (i)     any Relevant Party takes any action or any legal proceedings
                 are started or other steps taken for (or for the consideration
                 of) (i) any Relevant Party to be adjudicated or found bankrupt
                 or insolvent, (ii) the winding-up or dissolution of any
                 Relevant Party or (iii) the appointment of a liquidator,
                 trustee, receiver, administrator or similar officer of any
                 Relevant Party of the whole or any part of their respective
                 undertakings, assets, rights or revenues; or

         (j)     any event occurs or proceeding is taken with respect to any
                 Relevant Party in any jurisdiction to which it is subject
                 which has an effect equivalent or similar to any of the events
                 mentioned in Clauses 24.2 (g), (h) or (i); or

         (k)     any Relevant Party suspends or ceases or threatens to suspend
                 or cease to carry on its business; or

         (l)     all or a material part of the undertakings, assets, rights or
                 revenues of or shares or other ownership interests in, any
                 Relevant Party are seized, nationalised, expropriated or
                 compulsorily acquired by or under the authority of any
                 government; or





                                       50
<PAGE>   57
         (m)     any Relevant Party disposes or threatens to dispose of all or
                 a material part of its assets, whether by one or a series of
                 transactions, related or not, other than for the purpose of a
                 reconstruction or amalgamation the terms of which have
                 received the previous consent in writing of the Owner;

         (n)     there occurs, in the reasonable opinion of the Owner, a
                 material adverse change in the financial condition of the
                 Charterer or the Guarantor by reference to the financial
                 statements referred to in Clause 2.1(f) of this Charterparty
                 and Clause 5.1(i) of the Guarantee respectively; or

         (o)     any of the Relevant Documents at any time and for any reason
                 is or becomes invalid or unenforceable or otherwise ceases to
                 remain in full force and effect, or the validity or
                 enforceability of any of the Relevant Documents at any time
                 and for any reason is contested by any party thereto (other
                 than the Owner), or any such party denies that it has any, or
                 any further, liability thereunder or it becomes impossible or
                 unlawful for the Charterer or any other Relevant Party to
                 fulfil any of its covenants and obligations contained in any
                 of the Relevant Documents; or

         (p)     any Relevant Party repudiates any of its obligations under the
                 Relevant Documents or does or causes or permits to be done any
                 act or thing evidencing an intention to repudiate any of its
                 obligations under the Relevant Documents; or

         (q)     the Ship is arrested, confiscated, seized, taken in execution,
                 impounded, forfeited, detained in exercise or purported
                 exercise of any possessory lien or other claim, or otherwise
                 taken from the possession of any Relevant Party or any
                 operator thereof other than pursuant to a breach of Clause 6.1
                 by the Owner, as a result of any Encumbrance directly created
                 by the Owner which adversely affects the operation of the Ship
                 and any Relevant Party shall fail to procure the release of
                 the Ship at the earliest possible time and in any event within
                 a period of fourteen (14) days or if the Ship is not
                 redelivered under the MWB Conversion Contract with the works
                 provided for under that contract completed to the satisfaction
                 of the Owner on or before 1st May 1991 or such later date as
                 the Owner may agree in writing; or

         (r)     the registration of the Ship is cancelled or terminated
                 (otherwise than upon the Ship being redocumented or its
                 registration transferred as contemplated by Clause 14.3)
                 except by reason of the Owner's default in its obligations
                 under Clause 14.2; or

         (s)     any other event (other than a Total Loss) occurs or state of
                 affairs exists which has or may reasonably be expected to have
                 a prejudicial effect on the Owner's title to the Ship (other
                 than pursuant to a breach of Clause 6.1 by the Owner as a
                 result of any Encumbrance directly created by the Owner which
                 adversely affects the operation of the Ship) or a prejudicial
                 effect on its rights under any of





                                       51
<PAGE>   58
                 the Relevant Documents, or an adverse effect on the ability of
                 any Relevant Party to perform all or any of its obligations
                 under, or otherwise to comply with the terms of, any of the
                 Relevant Documents; or

         (t)     in the "requisite period", the Ship shall be used for any
                 purpose other than a "qualifying purpose" as those expressions
                 are described in Clause 13.2(e); or

         (u)     there shall occur a material adverse change, from the position
                 applicable immediately following Delivery, in the business,
                 affairs or condition (financial or otherwise) of any Relevant
                 Party the effect of which is (in the reasonable opinion of the
                 Owner) materially to imperil, delay or prevent the due
                 fulfillment by any Relevant Party of any of their obligations
                 and undertakings contained in any of the Relevant Documents;
                 or

         (v)     except with the prior written consent of the Owner the whole
                 of the legal and beneficial ownership of the whole of the
                 issued share capital of the Charterer ceases to be owned
                 directly or indirectly by the Guarantor.

25       OWNERS RIGHTS FOLLOWING A TERMINATION EVENT

25.1     At any time after any repudiation of this Charterparty by the
         Charterer, including the occurrence of any Termination Event (and
         provided that the same is continuing) the Owner may, by notice to the
         Charterer, accept such repudiation and immediately terminate the
         Charter Period (whereupon, as the Charterer hereby agrees and
         acknowledges, the Charterer's right, title and interest in and to the
         Ship and to possess and operate the Ship, shall terminate) and retake
         possession of the Ship, (the Owner agreeing, in such circumstances,
         that provided that the seaworthiness of the Ship is not thereby
         diminished nor the value of the Ship thereby materially altered the
         Charterer may first remove or that the Owner will at the Charterer's
         cost and expense remove and deliver to the Charterer, or to whomever
         else may be entitled thereto, any equipment belonging to the Charterer
         installed in or on the Ship, and the Charterer agrees that the Owner
         may for this purpose enter upon any premises belonging to or in the
         occupation or under the control of the Charterer where the Ship or any
         part thereof may be located, and the Charterer shall pay to the Owner
         forthwith upon such termination such sum as shall equal the aggregate
         of:

         (a)     all amounts due under the Charterparty or any of the other
                 Relevant Documents as shall be payable and remain outstanding;

         (b)     all losses incurred by the Owner in connection with such
                 termination including, without prejudice to the generality of
                 the foregoing, all costs and expenses so incurred in
                 recovering possession of the Ship, and in carrying out any
                 works or modifications required to bring the Ship up to the
                 condition  specified in Clause 18.1;





                                       52
<PAGE>   59
         and the Charterer shall also pay to the Owner forthwith upon such
         termination by way of agreed compensation and not as a penalty, the
         amount of the Termination Sum at the date of termination.

25.2     Without prejudice to the obligation of the Charterer to make the
         payments referred to in Clause 25.1 upon any such termination as is
         referred to in Clause 25.1 and provided that the Owner shall not be
         prevented from so doing for any reason whatsoever, the Owner shall
         endeavour to sell the Ship as soon as practicable. The Net Sale
         Proceeds shall be applied by the Owner subject to Clause 10.4 as
         follows:

         (a)     Firstly in or towards settlement of any amounts due and owing
                 by the Charterer to the Owner under this Charterparty or any
                 of the other Relevant Documents (including any interest due in
                 respect thereof);

         (b)     Secondly if the Charterer shall on or before the date of
                 application of the Net Sale Proceeds by the Owner have paid
                 the Termination Sum, or a part thereof, in accordance with
                 Clause 25.1, in or towards refunding by way of rebate of
                 charterhire or otherwise as appropriate to the Charterer the
                 amount of the Termination Sum or part thereof so paid by the
                 Charterer; and

         (c)     Thirdly an amount equal to two per cent (2%) of the Net Sale
                 Proceeds shall be retained by the Owner and any balance shall
                 be paid to any Relevant Party by way of rebate of charterhire
                 or otherwise as appropriate.

25.3     If the Charterer fails to comply with any of its obligations under
         this Charterparty or any of the other Relevant Documents the Owner
         may, without being in any way obliged so to do, or responsible for so
         doing, and without prejudice to the ability of the Owner to treat that
         non-compliance as a Termination Event, effect compliance on the
         Charterer's behalf, and if the Owner incurs any expenditure in
         effecting such compliance the Owner shall be entitled (without
         prejudice to Clause 25.1) to recover such expenditure from the
         Charterer together with interest thereon at the Relevant Rate of
         Interest from the date on which such expenditure is incurred by the
         Owner until the date of reimbursement thereof by the Charterer (both
         before and after any relevant judgment).

25.4     The rights and remedies of the Owner provided in this Charterparty are
         cumulative and are not exclusive of any rights and remedies provided
         by law.

26       INCREASED COSTS, FUNDING PROBLEMS AND ILLEGALITY

26.1     If the Owner notifies the Charterer that adequate and fair means do
         not exist for calculating the variable portion of the charterhire then
         the Owner shall give notice thereof to the Charterer and the Owner and
         the Charterer shall meet together to discuss the matter in good faith
         and, unless within thirty (30) days of the giving of such notice the
         Owner and the Charterer arrive, by negotiation in good faith, at an
         alternative basis





                                       53
<PAGE>   60
         acceptable to the Owner and the Charterer for continuing the Owner's
         funding of its purchase of the Ship and/or continuing the chartering
         of the Ship hereunder and calculating the variable portion of
         charterhire (and any alternative basis agreed in writing shall be
         retroactive to and effective from the commencement of the relevant
         period and shall continue until the Owner determines that
         circumstances are such that such alternative basis may cease to be
         effective) the Charterer shall indemnify the Owner from and against
         any liability, loss or expense suffered or incurred by the Owner
         during the relevant period provided that the Owner shall take all
         reasonable steps as may be open to it to mitigate the effect of this
         Clause.

26.2     If any law, regulation or regulatory requirement or any judgment,
         order or direction of any court, tribunal or authority binding upon
         the Owner in the jurisdiction in which it is formed or in which any
         action is required to be performed by it for the purposes of any of
         the Relevant Documents (whether or not in force before the date of
         this Charterparty) renders it unlawful for the Owner to continue to
         charter the Ship to the Charterer under this Charterparty the Owner
         shall promptly inform the Charterer and the Owner and the Charterer
         shall both be entitled by written notice to the other to terminate the
         Charter Period. Such termination shall be deemed to be a voluntary
         termination of the Charter Period in accordance with Clause 3.3
         (notwithstanding that such termination shall not have occurred on a
         date falling on or after the first (1st) anniversary of the Delivery
         Date or that the Owner shall not have received one hundred and eighty
         (180) days' notice thereof) and the provisions of Clauses 33 to 35
         shall apply thereto.

27       NOTICES

27.1     Every notice, request, demand or other communication under this
         Charterparty shall:

         (a)     be in writing delivered personally or by prepaid first class
                 letter, telex or facsimile transmission (confirmed in the case
                 of a telex or fax transmission, by prepaid first class letter
                 sent within 24 hours of despatch but so that the non-receipt
                 of such confirmation shall not affect in any way the validity
                 of the telex or facsimile transmission in question);

         (b)     be deemed to have been received, subject as otherwise provided
                 in this Charterparty, in the case of a telex, at the time of
                 despatch with confirmed answerback of the addressee appearing
                 at the beginning and end of the communication, in the case of
                 a facsimile transmission, at the time of despatch with
                 confirmation that the communication was well received
                 (provided that, in the case of a telex or facsimile
                 transmission, if the date of despatch is not a business day in
                 the country of the addressee it shall be deemed to have been
                 received at the opening of business on the next such business
                 day), and in the case of a letter, when delivered personally
                 or five (5) days after being put in the post;





                                       54
<PAGE>   61
         (c)     be sent:

                 (1)      to the Owner to:

                          Royal Bank of Scotland (Industrial Leasing) Limited
                          The Quadrangle
                          The Promenade
                          Cheltenham
                          Gloucestershire GL50 1PY
                          Telex : 43466 SMTCHT
                          Fax: 0242-224238

                          (Attention: Managing Director)

                 (2)      to the Charterer:

                          Simon-Horizon Limited
                          Horizon House
                          Azalea Drive
                          Swanley
                          Kent BR8 8JR
                          Telex 896050 EXPLOR G
                          Fax: 0322 613650

                          (Attention: Neil Campbell)

                 or to such other address, telex number or facsimile number as
                 is notified by one party to the other under this Charterparty.

28       ASSIGNMENT

28.1     Save as hereinafter provided, neither the Owner nor the Charterer may
         assign or otherwise transfer any of its rights or obligations under
         this Charterparty without the prior written consent of the other party
         hereto PROVIDED ALWAYS that the Owner may assign or otherwise transfer
         any or all of its rights under, and the benefit of, this Charterparty
         without the consent of the Charterer to any Subsidiary for the time
         being of The Royal Bank of Scotland Group plc. In the event of any
         such assignment or transfer by the Owner to any Subsidiary of The
         Royal Bank of Scotland Group plc, such assignment or transfer shall
         not impose any greater liabilities on the Charterer towards the Owner
         then those liabilities which the Charterer would have had to the Owner
         had no such assignment or transfer taken place.





                                       55
<PAGE>   62
29       MISCELLANEOUS

29.1     This Charterparty contains the entire agreement between the Owner and
         the Charterer relating to the chartering of the Ship, and the terms
         and conditions of this Charterparty shall not be varied otherwise than
         by an instrument in writing of even date herewith or subsequent hereto
         executed by or on behalf of the Owner and the Charterer.

29.2     No failure or delay on the part of the Owner in exercising any right,
         power or remedy under this Charterparty shall operate as a waiver
         thereof nor shall any single or partial exercise by the Owner of any
         such right, power or remedy preclude any other or further exercise
         thereof or the exercise of any other right, power or remedy. The
         remedies provided in this Charterparty are cumulative and are not
         exclusive of any remedies provided by law.

29.3     Subject to the periods of grace referred to in Clause 24, time shall
         be of the essence as regards the performance by the Charterer of its
         obligations under this Charterparty.

29.4     All rights and liabilities in respect of the Ship by way of General
         Average shall be for the account of the Charterer.

29.5     If any term or provision of this Charterparty or any of the other
         Relevant Documents or the application thereof to any person or
         circumstances shall to any extent be invalid or unenforceable, the
         remainder of this Charterparty and the other Relevant Documents or
         application of such term or provision to persons or circumstances
         (other than those as to which it is already invalid or unenforceable)
         shall not be affected thereby and each term and provision of this
         Charterparty and the other Relevant Documents shall be valid and be
         enforceable to the fullest extent permitted by law.

29.6     The Charterer authorises the Owner without prejudice to any of the
         Owner's rights of set-off at law, in equity or otherwise, at any time
         and with notice to the Charterer to set off or withhold from any sum
         or sums expressed in this Charterparty or one of the other Relevant
         Documents to be payable to the Charterer by the Owner any amount due
         and payable to the Owner from the Charterer under this Charterparty or
         any of the other Relevant Documents. For any such purpose the Owner is
         authorised to purchase with the sums which would but for this Clause
         29.6 be so payable to the Charterer, such other currencies as may be
         necessary to effect such set off or withholding. The Owner shall not
         be obliged to exercise any right given to it by this Clause 29.6. The
         Owner shall notify the Charterer forthwith upon the exercise or
         purported exercise of any right of set-off or withholding full details
         in relation thereto.

29.7     The Charterer undertakes that it will at its expense execute, sign,
         perfect and do any and every such further assurance, document, act or
         thing as in the reasonable opinion of the Owner may be necessary or
         desirable to carry out the purpose of this Charterparty or any





                                       56
<PAGE>   63
         of the other Relevant Documents or protect or enforce any right of the
         Owner hereunder or thereunder or the title of the Owner in the Ship.

29.8     In the event of any conflict between this Charterparty and any of the
         other Relevant Documents, the provisions of this Charterparty shall
         prevail.

30       LAW

30.1     This Charterparty is governed by and shall be construed in accordance
         with English law.

IN WITNESS whereof the parties hereto have entered into this Charterparty the
day and year first above written.





                                       57
<PAGE>   64
                                   SCHEDULE 1

                         List of Documents and Evidence



1        A copy certified by a Director or the Secretary of the relevant person
         to be a true, complete and up-to-date copy, of the Certificate of
         Incorporation and Memorandum and Articles of Association of each of
         the Charterer and the Guarantor.

2        A copy, certified by a Director or the Secretary (or similar officer)
         of the relevant person to be a true copy, and as being in full force
         and effect and not amended or rescinded, of resolutions of the board
         of directors of each of the Charterer and the other Relevant Parties:

         (i)     approving the transactions contemplated by such of the
                 Relevant Documents to which the relevant person is a party;

         (ii)    authorising a person or persons to sign and deliver on behalf
                 of the relevant person or, as the case may be, authorising the
                 sealing by the relevant person of the Relevant Documents to
                 which it is a party and any notices or other documents to be
                 given pursuant thereto;

3        A copy certified by a Director or the Secretary (or similar officer)
         of the relevant person to be a true copy, and as being in full force
         and effect and not revoked or withdrawn, of any power of attorney
         issued by the relevant person pursuant to the said resolutions.

4        A list, certified as true, complete and up to date by a Director or
         the Secretary (or similar officer) of each of the Relevant Parties of
         its directors and officers.

5        Evidence that all governmental and other licenses, approvals,
         consents, registrations and filings necessary for any matter or thing
         contemplated by the Relevant Documents and for the legality, validity,
         enforceability, admissibility in evidence and effectiveness thereof
         have been obtained or effected on an unconditional basis and remain in
         full force and effect (or, in the case of effecting of any
         registrations and filings, that arrangements satisfactory to the Owner
         have been made for the effecting of the same within any applicable
         time limit).

6        Certified true copies of the Memorandum of Agreement relative to the
         Ship between the Charterer and K/S Safir A/S and the Bill of Sale in
         respect thereof.

7        An independent valuation by valuers acceptable to the Owner of the
         current value of the Ship immediately prior to Delivery satisfactory
         to the Owner in all respects.





                                       58
<PAGE>   65
8.       An independent valuation of the current value of the Ship after the
         conversion works have been carried out and equipment installed in
         accordance with the Conversion and Supply Agreement or otherwise as
         proposed by the Charterer and confirming that the anticipated
         life-span of the Ship is not less than the Primary Period satisfactory
         to the Owner by valuers acceptable to the Owner.

9        An auditor's certificate in form and content satisfactory to the Owner
         confirming that the costs incurred by the Charterer in connection with
         the Ship (other than the Purchase Price) as at Delivery exceed One
         million two hundred thousand Pounds (L.1,200,000).

10       Evidence that, on Delivery, the Ship:

         (a)     will be registered forthwith in the name of the Owner as a
                 Bahamian ship at the Port of Nassau and that the Ship, the
                 Insurances and any Requisition Compensation are free of
                 Encumbrances other than Permitted Encumbrances;

         (b)     is safely afloat undamaged and maintains the Classification
                 with the Classification Society; and

         (c)     is insured in accordance with the provisions of this
                 Charterparty and all requirements of this Charterparty in
                 respect of such insurance have been complied with.

11       The Purchase Agreement duly executed by the Charterer.

12       The legal Bill of Sale referred to in the Purchase Agreement duly
         executed by the Charterer in favour of the Owner in such form as the
         Owner may have approved for the purposes of the Purchase Agreement
         together with all other documents to be delivered by the Charterer to
         the Owner pursuant to the Purchase Agreement.

13       The Guarantee duly executed by the Guarantor.

14       The Conversion and Supply Agreement duly executed by the Charterer.

15       A certified true copy of the MWB Conversion Contract.

16       Original invoices issued by the Yard prior to Delivery and in respect
         of which a reimbursement is claimed by the Charterer or made by the
         Owner to the Charterer pursuant to Clauses 3.3 or 3.4 of the
         Conversion and Supply Agreement.

17       The legal opinion of Dr. Schackow & Partner, special German legal
         advisers to the Owner, in form and content satisfactory to the Owner.





                                       59
<PAGE>   66
                                   SCHEDULE 2

                            Form of Delivery Notice



To:      Royal Bank of Scotland (Industrial Leasing) Limited
         [Address]


                                                        (dated)

                         Charterparty by way of Demise
                            dated     December, 1990
                      in respect of m.v. "Seaway Labrador"

         We refer to the above Charterparty and hereby give you notice that the
Expected Delivery Date is      December, 1990.

         We confirm that the representations and warranties contained in
Clauses 2.1 and 2.2 of the Charterparty are true and correct at the date hereof
as if made with respect to the facts and circumstances existing at such date.

         Words and expressions defined in the Charterparty shall have the same
meanings when used herein.

                              For and on behalf of
                             SIMON-HORIZON LIMITED


                            .......................





                                       60
<PAGE>   67
                                   SCHEDULE 3

                                  Charterhire


1        Definitions

         In addition to the definitions comprised in Clause 1 and Schedule 4 of
         this Charterparty the following expressions shall have the following
         meanings:

         "Accounting Period"               means an accounting period for the
                                           purposes of section 12 ICTA;
 
         "Applicable Rate"                 means in relation to any Interest
                                           Reference Period where the
                                           Applicable Rate is being applied to
                                           a negative balance of Notional
                                           Capital Outstanding, the greater of
                                           (i) LIBOR for that period and (ii) 7
                                           per cent per annum, in either case,
                                           plus the Reserve Asset Rate for that
                                           period;

         "Assumption"                      means the assumptions set out in
                                           paragraph 3 of this Schedule 3;

         "Corporation Tax                  means in relation to any Accounting
         Applicable Rate"                  Period of the Owner,
                                           the effective rate of Corporation
                                           Tax which is or would be applicable
                                           to companies generally in respect of
                                           taxable profits (if there were such
                                           profits and ignoring for this
                                           purpose the special rate applicable
                                           to small companies) of such
                                           Accounting Period, such rate to be a
                                           weighted average calculated on a
                                           time apportionment basis where
                                           different rates apply for more than
                                           one Financial Year within which such
                                           Accounting Period falls. Without
                                           prejudice to the foregoing, if, at
                                           any date on which a calculation is
                                           to be made hereunder, the
                                           Corporation Tax rates are fixed
                                           retrospectively or for some other
                                           reason the relevant rate is not
                                           known at the time, such calculation
                                           shall (without prejudice to any
                                           provision of this Schedule providing
                                           for such calculation to be adjusted
                                           once the rate of Corporation Tax is
                                           fixed by law) be made on the basis
                                           that the rate of Corporation Tax
                                           last fixed will not change;

         "Final Date"                      means the date falling nine months
                                           and one day after the last day of
                                           the Accounting Period of the Owner
                                           in which:




                                       61
<PAGE>   68
                                           (i)     the last Primary Period
                                                   Charterhire (or any
                                                   adjustment thereto) falls due
                                                   to be paid; or

                                           (ii)    any Termination Sum (or any
                                                   adjustment thereto) falls due
                                                   to be paid;

                                           whichever is later;

         "Financial Year"                  has the meaning given to that
                                           expression in Schedule 1 of the
                                           Interpretation Act 1978;

         "Interest Payment                 means, for any Interest Reference
         Date"                             Period, the date specified
                                           in respect thereof in Column 2 of
                                           the table annexed to this Schedule
                                           3, or if any such date is not a
                                           Banking Day, the immediately
                                           preceding Banking Day,

         "Interest Reference               means each of the following 
         Period"                           successive periods: 

                                           (i)    the period commencing on 1st
                                                  April, 1991 and ending on
                                                  30th June, 1991, and
                                                  thereafter each successive
                                                  period of three (3) months
                                                  commencing on the date
                                                  specified in Column 1 of the
                                                  table annexed to this
                                                  Schedule 3 and ending on the
                                                  day immediately preceding the
                                                  first day of the next
                                                  Interest Reference Period;
                                                  and

                                           (ii)   the period from the expiry of
                                                  the last three (3) month
                                                  period referred to in (i)
                                                  above to the Final Date;

         "LIBOR"                  means in relation to any Interest Reference
                                  Period, the annual percentage rate of
                                  interest (as certified by The Royal Bank of
                                  Scotland plc whose certificate shall in the
                                  absence of manifest error be conclusive and
                                  binding) at which deposits in Pounds for the
                                  period in question in amounts comparable with
                                  the sum in respect of which such interest
                                  rate falls to be determined were offered by
                                  The Royal Bank of Scotland plc to prime banks
                                  in the London Interbank Market at or about
                                  11.00 a.m. on the first day of such period
                                  or, if such day is not a Banking Day then on
                                  the immediately preceding day which is a
                                  Banking Day;

         "Notional Capital        means the amount of the Owner's investment in
         the Outstanding          Charterparty from time to time;





                                       62
<PAGE>   69
         "Owner's Group"          means all those companies which at any
                                  particular time constitute a group of
                                  companies for the purposes of the provisions
                                  relating to group relief contained in Chapter
                                  IV Part X ICTA and of which the Owner is a
                                  member;

         "Owner's Return"         means the Owner's after-tax profit take out
                                  rate of return;

         "Pre-Primary             means in relation to any Pre-Primary Interest
         Applicable Rate"         Reference Period where the PrePrimary 
                                  Applicable Rate is being applied to a
                                  negative balance of Notional Capital
                                  Outstanding, the greater of (i) Pre-Primary
                                  LIBOR for that period and (ii) 7 per cent per
                                  annum, in either case, plus the Reserve Asset
                                  Rate for that period;

         "Pre-Primary Interest    means each of 31st December 1990 and 31st
         Payment Date:            March 1991;
                      

         "Pre-Primary Interest    means each of the following successive 
         Reference Period"        periods:
                          

                                  (i)      the period commencing on the
                                           Delivery Date and ending on 31st
                                           December 1990;

                                  (ii)     the period commencing on the expiry
                                           of the period referred to in (i)
                                           above and ending on the date three
                                           (3) months thereafter;

         "Pre-Primary             means, in relation to any Pre-Primary 
         LIBOR"                   Interest Reference Period, the annual 
                                  percentage rate of interest (as certified by
                                  The Royal Bank of Scotland plc whose
                                  certificate shall in the absence of manifest
                                  error be conclusive and binding) at which
                                  deposits in Pounds for a period of one month
                                  in amounts comparable with the sum in respect
                                  of which such interest rate falls to be
                                  determined were offered by The Royal Bank of
                                  Scotland plc to prime banks n the London
                                  Interbank Market at   or about 11:00 am on
                                  the first day of such period or, if such day
                                  is not a Banking Day then on the immediately
                                  preceding day which is a Banking Day;

         "Pre-Primary             means the period commencing on the Delivery
         Period"                  Date and ending on the last day of the last
                                  Pre-Primary Interest Reference Period;

         "Primary Period          means the charterhire calculated and payable
                                  in accordance





                                       63
<PAGE>   70
         Charterhire"             with paragraph 2 of this Schedule 3 and,
                                  where applicable, as adjusted in accordance
                                  with paragraph 4 of this Schedule 3;

         "Reference Rate"         means thirteen per cent (13%) per annum;

         "Reserve Asset           means for any period the annual percentage
         Rate"                    rate of interest derived from the following 
                                  formula:

                                  CL+D(L-X)+(M-D)(L-T)+S(L-Z)% per annum
                                        100-(C+S+M)
 
                                  Where

                                  C =      The amount required to be held on
                                           non-operational non-interest bearing
                                           deposit account with the Bank of
                                           England pursuant to the Cash Ratio
                                           deposit requirement of the Bank of
                                           England, expressed as a percentage
                                           of The Royal Bank of Scotland plc's
                                           Eligible Liabilities ("The Cash
                                           Ratio Deposit")

                                  L =      LIBOR

                                  D =      The amount required to be held on
                                           secured Loans to members of the
                                           London Discount Market Association
                                           and/or on secured call Loans with
                                           those money brokers and gilt-edged
                                           primary market makers recognised for
                                           this purpose by the Bank of England,
                                           expressed as the normal average
                                           percentage of The Royal Bank of
                                           Scotland plc's Eligible Liabilities
                                           to be so maintained ("Discount House
                                           Deposits")

                                  X =      The rate of interest per annum at
                                           which Sterling deposits can be
                                           placed on secured Loans with a
                                           member of the London Discount Market
                                           Association at or about 11.00 on the
                                           relevant day for a period comparable
                                           to the relevant Interest Reference
                                           Period or for three months,
                                           whichever is the shorter. ("Discount
                                           House Deposit Rate")

                                  M =      The amount required by the Bank of
                                           England to be maintained in specific
                                           liquid assets, expressed as the





                                       64
<PAGE>   71
                                           normal average percentage of line
                                           Royal Bank of Scotland plc's
                                           Eligible Liabilities to be so
                                           maintained ("Mandatory Liquid
                                           Assets")

                                  T =      The yield on Treasury Bills having a
                                           period remaining to maturity
                                           comparable to the relevant Interest
                                           Reference Period, or for 91 days,
                                           whichever is shorter. If for 91 days
                                           the yield shall be calculated by
                                           reference to the average discount
                                           rate for Treasury Bills at the
                                           tender as published by the Bank of
                                           England weekly, usually on Friday;
                                           if for any lesser period the yield
                                           shall be calculated by reference to
                                           the discount rate quoted for the
                                           sale of Treasury Bills having that
                                           period remaining to maturity by a
                                           member of the London Discount Market
                                           Association at or about 11.00 am. on
                                           the relevant day ("Treasury Bill
                                           Yield")

                                  S =      The amount required to be placed as
                                           Special Deposits with the Bank of
                                           England, expressed as a percentage
                                           of The Royal Bank of Scotland plc's
                                           Eligible Liabilities ("Special
                                           Deposits")

                                  Z =      The rate of interest, per annum,
                                           allowed by the Bank of England, from
                                           time to time, on Special Deposits
                                           ("Interest on Special Deposits")

                                  In making any calculation under this formula:

                                  any negative factor shall be given the value
                                  zero; and
 
                                  each calculation shall be rounded up to the
                                  next one-sixteenth per cent.
                                  Provided that if such formula ceases in the
                                  reasonable option of The Royal Bank of
                                  Scotland plc to be a realistic and accurate
                                  basis for calculating the cost of The Royal
                                  Bank of Scotland plc complying with any
                                  reserve assets, interest free, special
                                  deposit or other requirements of a similar
                                  nature imposed on it by any competent
                                  authority (including, without limitation, the
                                  Bank of England) with similar intent (whether
                                  or not such requirements have the force of
                                  law) or if such a cost is imposed directly on
                                  the Owner then the Owner shall be entitled to
                                  modify, expand





                                       65
<PAGE>   72
                                  or replace such formula to the extent that
                                  the Owner in its discretion and acting in
                                  good faith considers necessary to make it a
                                  realistic basis for recovery of any reserve
                                  asset costs arising in connection with the
                                  funding of the transactions contemplated by
                                  this Charterparty provided that any
                                  modification, expansion or replacement shall
                                  be of similar effect to other formulae having
                                  a like purpose being or to be applied by
                                  clearing banks or (where such cost is imposed
                                  directly on the Owner) of undertakings
                                  comparable to the Owner in the United
                                  Kingdom;

         "Secondary Period        means the Charterhire calculated and payable
         Charterhire"             in accordance with paragraph 6 of this 
                                  Schedule 3;

         "Variable                means each of the Assumptions set out in
         Assumption"              paragraphs 3 (i) - (xx) (inclusive) of this 
                                  Schedule 3;

2        Primary Period Charterhire

2.1      During the Primary Period the Charterhire payable on each Charterhire
         Payment Date shall be L.14.82 per L.1000 of Original Cost.

2.2      Charterhire in respect of the Primary Period shall be payable in
         monthly installments in arrears. The first such instalment shall be
         payable on 1st May 1991 and a further instalment of Charterhire shall
         be payable on the first day of each month following after 1st May 1991
         up to (and including) 1st April 2001.

2.3      Each Primary Period Charterhire shall be subject to adjustment in the
         manner specified in paragraph 4 of this Schedule 3.

3        Assumptions in relation to Primary Period

         The Primary Period Charterhire has been calculated on the following
         Assumptions:

         (i)     that the Original Cost will be incurred in seven installments
                 in the following amounts on the following dates:

<TABLE>
<CAPTION>
                 Date                              Amount per L.1,000
                                                   of Original Cost
                 <S>                                      <C>
                                                          
                 15.11.90                                 571.20
                 15.12.90                                  12.50
                 10. 1.91                                  87.50
                 31. 1.91                                  41.50
                 28. 2.91                                  33.30
                 10. 3.91                                  62.50
                 31. 3.91                                 191.50
</TABLE>





                                       66
<PAGE>   73
                 and;


         (ii)    that the Primary Period will commence on 31st March 1991; and

         (iii)   that in accordance with the provisions of Chapter I Part II
                 CAA writing down allowances of 25 per cent per annum on a
                 reducing balance basis in respect of Original Cost will be
                 available to the Owner such writing down allowances to
                 commence in respect of all installments of Original Cost in
                 the Accounting Period of the Owner ending 31st March 1991 and
                 to continue in each subsequent Accounting Period of the Owner
                 until the Accounting Period of the Owner in which the Primary
                 Period expires by effluxion of time, that the writing down
                 allowances so available will not be withdrawn, either wholly
                 or in part, and that there will be no delay in the agreement
                 of the Owner's claim for such allowances; and

         (iv)    that the Ship will be sold in the Accounting Period of the
                 Owner in which the Primly Period expires by effluxion of time
                 and that the amount which the Owner is required to bring into
                 account as disposal value on such sale in accordance with
                 section 24 (6) CAA will be the balance of the Original Cost on
                 which writing down allowances are assumed to be available for
                 that Accounting Period by paragraph 3(iii) above; and

         (v)     that any interest paid or assumed to be paid in respect of
                 funds borrowed or assumed to be borrowed by the Owner for the
                 purpose of this transaction is or would had it actually been
                 paid have been allowed as a trading expense or as a charge on
                 income in the Accounting Period of the Owner to which such
                 interest relates or is paid (or assumed to be paid); and

         (vi)    that in the "requisite period", (as that expression is defined
                 in section 40 CAA) the Ship will not be used for a purpose
                 which results in section 42 CAA applying; and

         (vii)   that, in relation to Original Cost, no charge will arise under
                 section 46 CAA in respect of any excess relief (as therein
                 defined) or under section 42 CAA as the same may be amended,
                 extended, substituted or replaced from time to time; and

         (viii)  that any losses for taxation purposes arising to the Owner in
                 connection with the transactions contemplated by this
                 Charterparty (including losses arising as a result of the
                 availability of the said allowances) will be available for
                 offset against other profits of the Owner pursuant to section
                 393(2) ICTA or for surrender by way of





                                       67
<PAGE>   74
                 group relief in accordance with the provisions of sections 402
                 to 413 ICTA (as amended, and in force, as at the date hereof)
                 and that there will be no change in the law or practice in
                 relation to group relief which would affect or in any way
                 restrict the Owner's ability to surrender such losses to any
                 company in the Owner's Group or the ability of any company in
                 the Owner's Group to whom such losses are surrendered to claim
                 or enjoy the benefit of such surrender, and

         (ix)    that the Corporation Tax Applicable Rate applicable to
                 Accounting Periods of the Owner commencing on or after 1st
                 April 1990 and ending with the Accounting Period of the Owner
                 in which the Final Date falls will be 35 per cent; and

         (x)     that the Owner will not be required to bring into account as
                 disposal value (within the meaning of and in accordance with
                 the provisions of section 24 CAA) in respect of the Original
                 Cost an amount greater than the Net Sale Proceeds and/or
                 insurance proceeds in respect of the Ship actually received by
                 the Owner, and

         (xi)    that no change occurs in the nature, method or application of
                 any relevant United Kingdom taxation by reason of any
                 enactment, provision, practice or ruling of or by any
                 authority, whether legislative, judicial, administrative or
                 revenue, after the date of this Charterparty, and

         (xii)   that the provisions of section 10 ICTA will not be amended
                 after the date hereof so as to result in the Owner first
                 becoming liable to pay any Corporation Tax on profits for any
                 Accounting Period on a date other than the date which is nine
                 months and one day after the end of that Accounting Period;
                 and

         (xiii)  that the Owner will not be required by law or accounting
                 practice to draw up its accounts for any period other than 12
                 months and/or as at any date other than 31st March in any
                 year; and

         (xiv)   that the only amounts which the Owner will be required to
                 bring into account as income in calculating its profits by
                 reference to the chartering of the Ship will be the
                 charterhire in Pounds payable pursuant to paragraph 2 of this
                 Charterparty, and

         (xv)    that all installments of charterhire to be received by the
                 Owner under this Charterparty will be fully taxable on their
                 full amount in the Accounting Period of the Owner in which
                 they fall due to be paid; and

         (xvi)   that the Pre-Primary Applicable Rate will be equal to the
                 Reference Rate; and

         (xvii)  that the Owner will incur professional fees and disbursements
                 of L.2 per L.1000 of Original Cost (exclusive of Value Added
                 Tax) in respect of the transactions contemplated by this
                 Charterparty excluding the funding arrangements; and





                                       68
<PAGE>   75
         (xviii) that the fees incurred by the Owner referred to in paragraph
                 (xvii) above will be deductible as a trading expense in the
                 Accounting Period of the Owner in which such fees are payable;
                 and

         (xix)   that the interest assumed to be received and paid in
                 Assumptions 3 (xxi) and (xxiii) will be treated as accruing on
                 a daily basis for the purpose of Corporation Tax and will be
                 accrued on positive or negative balances of Notional Capital
                 Outstanding (as the case may be) until the Final Date; and

         (xx)    (1)      that all losses arising in an Accounting Period of
                          the Owner as referred to in paragraph 3 (viii) will
                          be surrendered to members of the Owner's Group;

                 (2)      that the Owner will receive payments for group relief
                          on the date assumed to be the date for payment of
                          Corporation Tax by the Owner in paragraph 3 (xii),
                          that no refund of such payments shall be made by the
                          Owner and that, in accordance with section 402(6)
                          ICTA, such payments will not be taken into account
                          (either as a receipt or a deduction) for Corporation
                          Tax purposes; and

         (xxi)   that on the Interest Payment Date in respect of each Interest
                 Reference Period during which the Notional Capital Outstanding
                 is

                          (i)     a negative figure the Owner will pay interest
                                  calculated on a daily basis using a 365 day
                                  year on the daily balances of Notional
                                  Capital Outstanding during such Interest
                                  Reference Period at the Reference Rate; or

                          (ii)    a positive figure the Owner will receive
                                  interest calculated on a daily basis using a
                                  365 day year on the daily balances of
                                  Notional Capital Outstanding during such
                                  Interest Reference Period at a rate of 7 per
                                  cent per annum; and

         (xxii)  the acquisition of the Ship by the Owner, its conversion
                 pursuant to the Conversion and Supply Agreement, the
                 chartering of the Ship under this Charterparty, the sale of
                 the Ship by the Owner under this Charterparty and the funding
                 of the transactions in relation thereto are the only
                 transactions carried out by the Owner and the Owner shall be
                 regarded as having no assets in respect of which capital
                 allowances are available other than the Ship provided that
                 nothing in this paragraph shall deem a balancing allowance to
                 be received by the Owner at any time; and

         (xiii)  that on each Pre-Primary Interest Payment Date in respect of
                 each Pre-Primary Interest Reference Period during which
                 Notional Capital Outstanding is a negative





                                       69
<PAGE>   76
                 figure, the Owner will pay interest at the Pre-Primary
                 Applicable Rate calculated on a daily basis using a 365 day
                 year on the daily balances of Notional Capital Outstanding
                 during each Pre-Primary Interest Reference Period and that
                 such interest is compounded on 31st December 1990 and 31st
                 March 1991; and

         (xiv)   that no fees will be payable to London Financial Group
                 limited; and

         (xv)    that the interest referred to in paragraphs 3(xxi) and (xxiii)
                 will be payable to a person carrying on a bona fide banking
                 business in the UK.

4        Adjustments to Primary Period Charterhire

4.1      Change in Assumptions

         On or as soon as reasonably practicable after any date on which the
         Owner becomes aware or is notified by the Charterer that there has
         been a change In any of the Variable Assumptions on the basis of which
         the Primary Period Charterhire has been calculated and the effect of
         such change would require the Primary Period Charterhire to be
         adjusted if the Owner's Return is neither to be increased or
         decreased, the Owner shall notify the Charterer of the amount by which
         the Primary Period Charterhire is required to be adjusted upwards or
         downwards. Any such adjustment shall:

         (a)     subject to sub-paragraphs (b) and (c) below, be calculated on
                 the same basis as the Primly Period Charterhire was calculated
                 and by reference to the Assumptions in order to ensure that
                 the Owner's Return is neither increased nor decreased; and

         (b)     take into account any changes in any of the Variable
                 Assumptions which have occurred (and are known to the Owner)
                 between the date of this Charterparty and the date of
                 notification of such adjustment; and

         (c)     be such as to ensure that, subject to the payment by the
                 Charterer of the adjusted Primary Period Charterhire on each
                 subsequent Charterhire Payment Date and on the basis that each
                 instalment of the adjusted Charterhire shall bear to each
                 other such instalment the same ratio as each instalment of the
                 Primary Period Charterhire bears to each other Primary Period
                 Charterhire instalment, the Notional Capital Outstanding on
                 the Final Date will be zero or as near thereto as may be.

4.2      Adjusted Primary Period Charterhire

         As from the date any notification of adjusted Primly Period
         Charterhire is to take effect in accordance with this Charterparty the
         amount of charterhire to be paid on each Charterhire Payment Date
         during the Primary Period shall be the adjusted Primary Period
         Charterhire so notified.





                                       70
<PAGE>   77
4.3      Change in Assumptions after the Primary Period

         If the Owner shall become aware or is notified by the Charterer that
         there has been a change in any of the Variable Assumptions on the
         basis of which any Primary Period Charterhire has been calculated at a
         time when no Primary Period Charterhire remains to be paid the Owner
         shall as soon as reasonably practicable determine a single amount
         calculated on the basis of the Assumptions but taking into account any
         changes in any of the Variable Assumptions which have occurred and are
         known to the Owner between the date of this Charterparty and the date
         of such calculation which shall be either payable by the Charterer to
         the Owner by way of additional charterhire or by the Owner to the
         Charterer by way of rebate of charterhire and which amount shall be
         calculated so that the Owners Return is neither increased nor
         decreased. No account shall be taken of a change in a Variable
         Assumption occurring more than six years after the last day of the
         Accounting Period in which the final instalment of Primary Period
         Charterhire falls to be paid.

4.4      Correcting adjustments

         Of a Variable Assumption which has been regarded as incorrect
         subsequently proves to have been correct or to be incorrect in a
         different manner or with a different effect from that which such
         Assumption was originally regarded as incorrect, then, such further
         adjustments shall be made under paragraph 4 as may be required to
         ensure that the Owners Return is the same as it would have been had
         the relevant Assumption (and all such other Assumptions) proved to be
         correct at all times (but fully taking into account the amount of any
         previous adjustments).

4.5      Exclusion of Adjustments

         No adjustment of charterhire shall be made under Paragraph 4 if and to
         the extent that any of the Variable Assumptions shall prove to be
         incorrect solely as a result of:

         (i)     otherwise than as a result of Assumption (xi) proving to be
                 incorrect, the Owner not being or ceasing to be resident in
                 the UK for the purpose of Corporation Tax or not being or
                 ceasing to be within the charge to Corporation Tax in respect
                 of the Ship;

         (ii)    otherwise than as a result of Assumption (xi) proving to be
                 incorrect or a default by the Charterer, the Owner (or any
                 member of the Owner's Group to which it might surrender or
                 purport or wish to surrender group relief) not having a
                 sufficiency of profits, or gains or income, in any Accounting
                 Period or part thereof;

         (iii)   otherwise than as a result of Assumption (xi) proving to be
                 incorrect, the Owner (or member of the Owner's Group as
                 aforesaid) voluntarily causing any or





                                       71
<PAGE>   78
                 permitting any of its Accounting Periods to be other than
                 twelve months ending on a date other than on 31st March in
                 each year,

         (iv)    the Owner failing duly to claim in the appropriate amount and
                 in the correct manner or disclaiming any capital allowance to
                 which it is properly entitled (or to which but for any of the
                 facts or circumstances referred to in this paragraph 4.5 it
                 would be properly entitled) in respect of the Ship;

         (v)     the Owner disposing of the Ship (or any interest therein)
                 otherwise than in accordance with or as contemplated by this
                 Charterparty;

         (vi)    the Owner materially failing to meet its obligations under
                 clause 2.5 and/or clause 3.4 of the Conversion and Supply
                 Agreement.

4.6      Notification and Disputes

         (a)     The Owner shall certify in writing the amount of any
                 calculation or adjustment under this Schedule 3 or Schedule 4
                 or the determination of any rate of interest or other amount
                 payable under this Agreement together with reasonably
                 sufficient detail to substantiate such calculation, adjustment
                 or determination and in the event of there being a dispute as
                 to the amount of such calculation, adjustment or
                 determination, then without prejudice to the obligation of the
                 Charterer to pay amounts as certified pending resolution of
                 such dispute, the same shall immediately be referred to the
                 auditors for the time being of the Owner ("the Accountants")
                 (acting as experts and not as arbitrators) whose decision
                 shall in the absence of manifest error, be final and binding
                 on the parties.

         (b)     The Owner shall supply to the Accountants a copy of the
                 example cash flow on which the Owner has based the calculation
                 of Primly Period Charterhire and the Owner shall provide the
                 Accountants with any revised cash flow on the basis of which
                 the Owner calculates an adjustment to the charterhire payable
                 hereunder.

         (c)     Where the decision of the Accountants results in an adjustment
                 to any calculation certified as aforesaid by the Owner, such
                 payment shall be made between the parties as the Accountants
                 (acting as experts and not as arbitrators) shall certify as
                 appropriate to give effect to such adjustment (after taking
                 into account any financial or cash flow advantage or
                 disadvantage to either of the parties resulting from the
                 making of such adjustments and payments). The costs of and in
                 connection with such reference to the Accounts shall unless
                 otherwise agreed, be payable by the Charterer unless the
                 Accountants' decision shall reveal that the Owner's
                 calculation of such adjustment or determination was
                 significantly inaccurate, having regard to the size of the
                 transaction of which this Charterparty forms part and the
                 result thereof would have been adverse to the Charterer.





                                       72
<PAGE>   79
         (d)     The Owner agrees to notify the Charterer of any communication
                 ("Claim") it receives from the Inland Revenue indicating that
                 any matter relating to or affecting the correctness of any of
                 the Variable Assumptions and/or Variable Termination
                 Assumptions is being disputed by the Inland Revenue and as a
                 result there is or it appears that there is likely to be an
                 upward adjustment of charterhire under this Agreement or
                 upward adjustment in the Termination Sum.

         (e)     Following such notification and provided that the Owner
                 continues to receive from the Charterer all amounts of
                 charterhire and all other sums payable under this Agreement
                 the Owner agrees to discuss the Claim with the Charterer and
                 upon request to provide to the Charterer relevant extracts of
                 the correspondence with the Inland Revenue concerning such
                 Claim save that the Owner shall not be required to provide any
                 information or correspondence which is in the opinion of the
                 Owner confidential or of a sensitive nature having regard to
                 the business of the Owner or of the Owner's Group. Such
                 discussions shall take place with a view to agreeing the form
                 and content of the Owner's response to such claim.

         (f)     If the subject matter of the Claim is not resolved by
                 negotiation with the Inland Revenue the Charterer may require
                 the Owner to obtain (at the Charterer's expense) the opinion
                 of leading tax counsel ("Counsel") concerning the merits of
                 the subject matter of the claim. The Owner and Charterer will
                 instruct such Counsel as they may mutually agree provided that
                 if the parties shall not reach such agreement the Owner shall
                 instruct the Counsel of its choice. The Owner's legal advisers
                 will prepare Instructions to Counsel. The Charterer may make
                 representations as to the contents of such Instructions but
                 the Owner shall not be obliged to reflect those
                 representations in the Instructions submitted to Counsel. The
                 Charterer and its professional advisers may attend any
                 conference with Counsel save that the Charterer and its
                 professional advisers shall withdraw from such conference at
                 the request of the Owner when in the of opinion of the Owner
                 matters which in the Owner's opinion are confidential or of a
                 sensitive nature having regard to the business of the Owner or
                 the Owners Group may be discussed during such conference.

         (g)     The Owner shall have the sole right to decide whether to
                 pursue any appeal to the Special or General Commissioners (as
                 the case may be) or beyond. The Owner and the Charterer agree
                 to consult in such circumstances with a view to agreeing
                 whether or not any application for postponement of payment of
                 tax should be made.

         (h)     The Charterer hereby agrees to keep the Owner indemnified
                 against any costs, expenses or charges (including, without
                 limitation, interest or penalties in respect of Taxes) arising
                 to or incurred by the Owner in respect of any action taken by
                 the Owner under the provisions of sub-paragraph 4.6(d) to (g)
                 (inclusive) and it shall be a condition precedent to the
                 Owner's obligations under those





                                       73
<PAGE>   80
                 sub-paragraphs that the Charterer shall provide or procure
                 security to the reasonable satisfaction of the Owner in
                 respect of its obligations under this paragraph 4.6 (h).

4.7      Limitation

         In the event of any assignment or transfer of this Charterparty by the
         Owner pursuant to Clause 28 other than to a member of the Owner's
         Group the Charterer shall have or incur (at that or at any subsequent
         time) no greater liability to pay any charterhire, additional
         charterhire, Termination Sum or other moneys under this Charterparty
         or have or enjoy (at that or any subsequent time) any lesser
         entitlement to a reduction, refund, repayment or rebate of any
         charterhire, additional charterhire, Termination Sum or any other
         moneys than it would have had if no such sale or disposal had been
         made and had Royal Bank of Scotland (Industrial Leasing ) Limited
         continued to be the Owner at all material times.

5        Adjustment to Charterhire for changes in Interest Rates

5.1      The Primary Period Charterhire has been calculated on the assumption
         that the Applicable Rate for each Interest Reference Period will be 13
         per cent per annum.  Where for any Interest Reference Period the
         Applicable Rate shall be more or less than 13 per cent per annum then
         on the relevant Interest Payment Date the Charterer shall pay to the
         Owner by way of additional charterhire or the Owner shall pay to the
         Charterer by way of rebate of charterhire the amount calculated by
         multiplying for each 1 per cent increase or it decrease in the
         Applicable Rate above or below 13 per cent (with adjustments for
         variation other than an integral multiple of 1 per cent being made pro
         rata to two decimal places) the Original Cost by the amount listed
         opposite the relevant Interest Reference Period in Column 3 of the
         Table annexed to this Schedule 3 and dividing the result by 1,000.

5.2      The amounts specified in Column 3 of the Table annexed to this
         Schedule 3 are calculated on the basis of the Assumptions. In the
         event that any of the Variable Assumptions proves to be incorrect then
         the Owner will provide the Charterer with a revised Table prepared on
         the same basis as the Table annexed to this Schedule 3 except in so
         far as is necessary to reflect the change in any Variable Assumptions
         which have proved to be incorrect. Thereupon this paragraph shall
         continue to apply in respect of such revised Table mutatis mutandis
         and so on.

5.3      The Primary Period Charterhire payable under paragraph 2 of this
         Schedule 3 (including any adjustments thereto which may be required
         pursuant to the terms of this Schedule) may be replaced by agreement
         between the Owner and the Charterer by Primary Period Charterhire
         calculated on the same basis but adjusted to reflect the availability
         of fixed-rate funding to be obtained by the Owner in place of variable
         rate funding obtained or assumed to be obtained by the Owner for the
         purposes of the transactions





                                       74
<PAGE>   81
         contemplated by this Charterparty. In such event the Owner and the
         Charterer shall enter into a memorandum specifying the terms on which
         the Primary Period Charterhire shall be adjusted and the Table annexed
         to this Schedule 3 (or replacement Table) shall be revised accordingly
         to take account of such fixed rate funding on the basis that the
         Owner's Return shall be neither increased nor decreased. The Charterer
         will bear any commitment commission or other fee (including legal
         fees) incurred by the Owner in obtaining that fixed rate funding and
         in connection with the memorandum provided that such commission or
         other fee (other than legal fees) shall be notified in advance to the
         Charterer (or the basis for calculating the same) and specifically
         referred to in the memorandum.

5.4      The Charterer undertakes and agrees to indemnify the Owner on demand
         against any loss, cost, expense or detriment (as certified to the
         Charterer by the Owner) sustained or incurred by the Owner (including
         without limitation any damages, penalties or premiums incurred by the
         Owner) as a result of the Owner repaying prior to its specified
         maturity any funding obtained by the Owner or re-employing or
         liquidating any funds received from third parties acquired in relation
         to the transactions contemplated by this Charterparty, the Purchase
         Contract and the Conversion and Supply Agreement in consequence of the
         service or deemed service by the Charterer of a notice pursuant to
         Clause 3.3 or Clause 3.4 of this Charterparty, a Total Loss or the
         occurrence of a Termination Event in the event the same is actually
         accepted by the Owner as a repudiation of this Charterparty.

6        Secondary Period Charterhire

6.1      The Secondary Period Charterhire shall be payable annually in advance
         and each installment of Secondary Period Charterhire shall be L.2 for
         every L.1000 of Original Cost.

6.2      An installment of Secondary Period Charterhire shall be due on 2nd
         April 2001 and on each anniversary thereof during the Secondary
         Period.





                                       75
<PAGE>   82
                                      Annexure to Schedule 3

<TABLE>
<CAPTION>
Simon-Horizon Limited                                              Royal Bank of Scotland (Industrial Leasing) Limited.
- ---------------------                                              ----------------------------------------------------

Rental Variation Factor
- -----------------------
                                         1% Interest                                                       1% Interest
 Fixing              Settlement          Variation                   Fixing            Settlement          Variation
 Date                Date                Factor                      Date              Date                Factor
 ----                ----                ------                      ----              ----                ------
 <S>                 <C>                 <C>                         <C>               <C>                 <C>
 1.04.91             1.07.91             L.2.59                      1.07.96           1.10.96             L.1.17
 1.07.91             1.10.91             L.2.59                      1.10.96           1.01.97             L.1.10
 1.10.91             1.01.92             L.2.58                      1.01.97           1.04.97             L.1.04
 1.01.92             1.04.92             L.2.27                      1.04.97           1.07.97             L.0.98
 1.04.92             1.07.92             L.2.23                      1.07.97           1.10.97             L.0.92
 1.07.92             1.01.93             L.2.22                      1.10.97           1.01.98             L.0.84
 1.10.92             1.01.93             L.2.19                      1.01.98           1.04.98             L.0.80
 1.01.93             1.04.93             L.1.97                      1.04.98           1.07.98             L.0.73
 1.04.93             1.07.93             L.1.95                      1.07.98           1.10.98             L.0.65
 1.07.93             1.10.93             L.1.93                      1.10.98           1.01.99             L.0.56
 1.10.93             1.01.94             L.1.89                      1.01.99           1.04.99             L.0.54
 1.01.94             1.04.94             L.1.74                      1.04.99           1.07.99             L.0.45
 1.04.94             1.07.94             L.1.71                      1.07.99           1.10.99             L.0.36
 1.07.94             1.10.94             L.1.67                      1.10.99           1.01.00             L.0.26
 1.10.94             1.01.95             L.1.62                      1.01.00           1.04.00             L.0.26
 1.01.95             1.04.95             L.1.51                      1.04.00           1.07.00             L.0.16
 1.04.95             1.07.95             L.1.47                      1.10.00           1.10.00             L.0.16
 1.07.95             1.10.95             L.1.42                      1.10.00           and                 Nil
                                                                                       thereafter
 1.01.96             1.04.96             L.1.29
 1.04.96             1.07.96             L.1.23
</TABLE>





                                                76
<PAGE>   83
                                   SCHEDULE 4

                                 Temination Sum



1        In addition to the definitions comprised in Clause 1 and paragraph 1
         of Schedule 3 to this Charterparty the following expressions shall
         have the following meanings:

         "Table"                  means the table annexed to this Schedule 4;

         "Revised Table"          means any revised Table produced pursuant to
                                  paragraph 3 of this Schedule 4;

         "Settlement Date"        means each of the dates set out in Column 1
                                  of the Table or any Revised Table;

         "Variable Termination    means the assumptions set out in paragraph
         Assumptions"             3.2 of this Schedule 4.
                                  

2        The Termination Sum on any relevant date shall be the sum calculated
         according to the following formula:

                 A X B
                 1000

         where:

         (i)     A =      Original Cost of the Ship; and

         (ii)    B =      the amount listed in Column 2 of the Table or any
                          Revised Table opposite, where the relevant date is
                          not a Settlement Date, the next following Settlement
                          Date or where the relevant date is a Settlement Date,
                          that Settlement Date.

3.1      The amounts specified in Column 2 of the Table arc calculated on the
         basis of the Assumptions and the Variable Termination Assumptions.

3.2      The Variable Termination Assumptions are:

         (a)     that for the purposes of section 24 CAL the amount of the Net
                 Sale Proceeds (in the case of a sale of the Ship) and/or any
                 moneys actually received by the Owner in respect of a Total
                 Loss will be equal to the equaling expenditure in respect of
                 the Original Cost at the commencement of the Accounting Period
                 of the Owner in which the Termination Sum is payable;

         (b)     that for the purposes of section 24 CAA the Ship will be sold
                 or a Total Loss will occur and Net Sales Proceeds or, as the
                 case may be, insurance proceeds will be received by





                                       77
<PAGE>   84
                 the Owner in the same Accounting Period as that in which the
                 Termination Sum is payable;

         (c)     that the refund of charterhire or payment of sales agency
                 commission in respect of Net Proceeds of Sale and/or moneys
                 received by the Owner in respect of a Total Loss due in
                 accordance with Clauses 3.5, 21.5 and 25.2 of the
                 Charterparty:

                 (i)      will occur in the Accounting Period of the Owner in
                          which the Termination Sum is payable;

                 (ii)     that any refund of charterhire will be wholly
                          deductible for Corporation Tax purposes as a trading
                          expense in the Accounting Period of the Owner in
                          which the Termination Sum is payable;

                 (iii)    that any payment of sales agency commission
                          (excluding recoverable Value Added Tax) will be
                          deductible from and in computing the amount to be
                          brought into account as disposal value under section
                          24 CAA in the Accounting Period of the Owner in which
                          such disposal value falls to be brought into account;

                 (iv)     that the Owner will be able effectively to deduct the
                          trading expense referred to in paragraph 3.2(c)(ii)
                          above in computing its Corporation tax liability in
                          respect of the Net Proceeds of Sale and/or any moneys
                          received by the Owner in respect of a Total Loss; and

         (d)     that all and no more or no less of the Net Proceeds of Sale
                 (less any sales agency commission) and/or any moneys received
                 by the Owner in respect of Total Loss in excess of Original
                 Cost shall be treated as a chargeable gain for United Kingdom
                 Corporation Tax purposes in the Accounting Period of the Owner
                 in which the Termination Sum falls due and that the rate of
                 Corporation Tax in respect of chargeable gains is the same as
                 the rate assumed in paragraph 3.1(ix) of Schedule 3;

3.3      On or as soon as reasonably practicable after any date on which the
         Owner becomes aware that any of the Variable Assumptions or any of the
         Variable Termination Assumptions has become or will become incorrect
         (which shall be referred to in this Schedule 4 as a change in a
         Variable Assumption or Variable Termination Assumption) then the Owner
         will provide the Charterer with a Revised Table (but only if such
         Revised Table would differ from the existing Table) prepared on the
         same basis as the Table except that the preparation of such Revised
         Table shall take account of the change in say Variable Assumption or
         Variable Termination Assumption and except that such Revised Table
         shall take account of the Termination Sum due and payable on the
         Termination Date where the Revised Table is produced after such date
         and which Revised Table shall be calculated so that the Owner's Return
         shall be neither increased nor decreased. Insofar as a change in
         Variable Termination Assumption 3.2 (d) is concerned no account shall
         be taken in preparing any Revised Table of (a) any rollover or
         holdover of gains to another asset or (b) of any allowable losses
         arising to the Owner from the disposal of assets other than the Ship
         or (c) of relief for any losses for the purpose of capital gains tax
         or Corporation Tax on chargeable gains arising from the disposal of
         the Ship. Any Revised Table shall be deemed to





                                       78
<PAGE>   85
         take effect from the date when the change in any such Variable
         Assumption or Variable Termination Assumption occurs.

3.4      Following production by the Owner to the Charterer of a Revised Table
         pursuant to paragraph 3.3 of this Schedule 4 at a time after the
         Termination Sum has been paid or the obligation to pay the Termination
         Sum has been discharged the Owner shall recalculate the amount of the
         Termination Sum using such Revised Table with effect from the date on
         which the Termination Sum was first calculated and shall notify the
         Charterer of the amount thereof and of the amount of difference
         between the Termination Sum as so calculated and as immediately
         previously calculated. Within 30 days of such notification the
         Charterer shall pay to the Owner by way of additional charterhire the
         amount of the difference so notified where that amount is a positive
         figure or the Owner shall pay to the Charterer by way of rebate of
         charterhire the amount of the difference so notified where the amount
         is a negative figure.

3.5      As from the date any Revised Table is to take effect in accordance
         with this Charterparty the same shall be deemed to be incorporated
         herein in substitution for the Table or any previous Revised Table and
         payments to be made hereunder shall be determined by reference
         thereto.

3.6      No Revised Table may be produced pursuant to paragraph 3.3 above if
         the date on which the Owner became aware that there has been any
         change in a Variable Assumption or Variable Termination Assumption
         falls seven years after the date which is nine months and one day
         after the last day of the Accounting Period of the Owner in which the
         Termination Sum initially fell due to be paid.

4.       Paragraphs 4.4 to 4.7 of Schedule 3 to this Charterparty shall apply
         with all necessary and/or appropriate adaptations to this Schedule in
         relation to Variable Termination Assumptions, revisions to the Table
         and adjustments to or repayments of Termination Sums (and other
         matters contemplated hereby) as it applies to that Schedule in
         relation to Variable Assumptions or adjustments of charterhire (and
         other matters contemplated thereby).





                                       79
<PAGE>   86
                              Table to Schedule 4
                             SIMON-HORIZON LIMITED

<TABLE>
<CAPTION>
Termination               Termination      Termination              Termination
- -----------               -----------      -----------              -----------
Date                      Amount           Date                     Amount
- ----                      ------           ----                     ------
<S>                       <C>              <C>                      <C>
1 May 1991                1059.87          1 January 1995           837.65
1 June 1991               1057.69          1 February 1995          831.56
1 July 1991               1055.06          1 March 1995             824.56
1 August 1991             1052.76          1 April 1995             805.09
1 September 1991          1050.50          1 May 1995               798.39
1 October 1991            1047.80          1 June 1995              791.87
1 November 1991           1045.43          1 July 1995              785.00
1 December 1991           1042.69          1 August 1995            778.30
1 January 1992            1040.31          1 September 1995         771.51
1 February 1992           1037.26          1 October 1995           764.38
1 March 1992              1033.41          1 November 1995          757.41
1 April 1992              1019.75          1 December 1995          750.10
1 May 1992                1016.11          1 January 1996           742.95
1 June 1992               1012.79          1 February 1996          735.73
1 July 1992               1009.06          1 March 1996             727.93
1 August 1992             1005.66          1 April 1996             708.20
1 September 1992          1002.20          1 May 1996               700.37
1 October 1992             998.34          1 June 1996              692.67
1 November 1992            994.79          1 July 1996              684.65
1 December 1992            990.83          1 August 1996            676.74
1 January 1993             987.18          1 September 1996         668.74
1 February 1993            983.15          1 October 1996           660.42
1 March 1993               978.03          1 November 1996          652.20
1 April 1993               961.40          1 December 1996          643.67
1 May 1993                 956.76          1 January 1991           635.24
1 June 1993                952.39          1 February 1997          626.79
1 July 1993                947.64          1 March 1997             617.64
1 August 1993              943.15          1 April 1997             598.16
1 September 1993           938.60          1 May 1997               589.11
1 October 1993             933.67          1 June 1997              580.14
1 November 1993            928.99          1 July 1997              570.88
1 December 1993            923.93          1 August 1997            561.67
1 January 1994             919.13          1 September 1997         552.35
1 February 1994            914.10          1 October 1997           542.74
1 March 1994               908.06          1 November 1997          533.18
1 April 1994               889.61          1 December 1997          523.33
1 May 1994                 883.96          1 January 1998           513.52
1 June 1994                878.55          1 February 1998          503.74
1 July 1994                872.76          1 March 1998             493.37
1 August 1994              867.19          1 April 1998             474.60
1 September 1994           861.56          1 May 1998               464.24
1 October 1994             855.55          1 June 1998              453.89
1 November 1994            849.75          1 July 1998              443.27
1 December 1994            843.60          1 August 1998            432.66
</TABLE>





                                      80
<PAGE>   87
<TABLE>
<CAPTION>
Termination               Termination      Termination              Termination
- -----------               -----------      -----------              -----------
Date                      Amount           Date                     Amount
- ----                      ------           ----                     ------
<S>                       <C>              <C>                      <C>
1 September 1998          421.91           1 January 2000           225.63
1 October 1998            410.91           1 February 2000          212.80
1 November 1998           399.88           1 March 2000             199.64
1 December 1998           388.61           1 April 2000             183.47
1 January 1999            377.31           1 May 2000               170.09
1 February 1999           366.07           1 June 2000              156.60
1 March 1999              354.37           1 July 2000              142.90
1 April 1999              336.72           1 August 2000            129.07
1 May 1999                324.92           1 September 2000         115.07
1 June 1999               313.07           1 October 2000           100.87
1 July 1999               300.98           1 November 2000           86.56
1 August 1999             288.83           1 December 2000           72.15
1 September 1999          276.53           1 January 2001            57.68
1 October 1999            264.00           1 February 2001           43.11
1 November 1999           251.39           1 March 2001              23.44
1 December 1999           238.55           1 April 2001              14.83
</TABLE>



Where a Termination Sum falls due on a rental payment date the rental payable
on such a date is included in the Termination Sum quoted.





                                      81
<PAGE>   88
                                   SCHEDULE 5

                         Forms of Loss Payable Clauses



(A)      Hull and Machinery (Marine and War Risks)

         By a Charterparty by way of Demise made the ___ day of December, 1990,
         Royal Bank of Scotland (Industrial Leasing) Limited (the "Owner") has
         demise chartered m.v. "Seaway Labrador" (the "Ship") to Simon-Horizon
         Limited (the "Charterer") and the Charterer has pursuant to a first
         priority assignment contained in such Charterparty assigned to the
         Owner all of the right, title and interest of the Charterer in any and
         all policies and contracts of insurance from time to time taken out or
         entered into by or for the benefit of the Charterer and the Owner in
         respect of the Ship.

         All recoveries under this policy shall be applied as follows:

         (a)     all claims hereunder in respect of an actual or constructive
                 or compromised or arranged total loss, and all claims in
                 respect of a major casualty (that is to say any casualty the
                 claim in respect of which exceeds L.250,000 (or the
                 equivalent) inclusive of any deductible) shall be paid in full
                 to the Owner or to its order; and

         (b)     all other claims hereunder shall be paid in full to the
                 Charterer or to its order, unless and until the Owner shall
                 have notified insurers hereunder to the contrary, whereupon
                 all such claims shall be paid to the Owner or to its order.

(B)      Protection and Indemnity Risks

         Payment of any recovery which Royal Bank of Scotland (Industrial
         Leasing) Limited of 42 St. Andrew Square, Edinburgh EH2 2YE (the
         "Owner") or Simon-Horizon Limited of Horizon House, Azalea Drive,
         Swanley, Kent BR8 8JR (the "Charterer") is entitled to make out of the
         funds of the Association in respect of any liability, costs or
         expenses incurred by the Owner or the Charterer, shall be paid to the
         person to whom the liability (or alleged liability) covered by the
         entry was incurred or if the liability (or alleged liability) to such
         person has previously been discharged by the Owner or the Charterer,
         such moneys shall be paid to the Owner or its order or, as the case
         may be, the Charterer or its order in reimbursement of the moneys so
         expended by it in satisfaction of such liability or alleged liability,
         unless and until the Association receives notice to the contrary from
         the Owner; provided that no liability whatsoever shall attach to the
         Association, its Managers or their agents for failure to comply with
         the later obligation until the expiry of two clear business days from
         the receipt of such notice.





                                       82
<PAGE>   89
                                  SCHEDULE 6

                          List of Excluded Equipment



1 HERRINGBONE SYSTEM
64 T.I. SLEEVE GUNS
2 UMBILICAL WINCHES, MPD
2 UMBILICAL WINCHES, LOW PULL, MPD
4 SLIPRING UNITS PLUS ASSY
4 STOWING WINCHES
1 AIR CONDITIONING UNIT, INST ROOM
1 STREAMER REEL, MPD
1 LITTON STREAMER Z6010390/6010430
1 LEAD IN Z6010392
1 STREAMER CONNECTOR SET 10-303132
1 SYNTRAK DIGITISING MODULE 10-305002
1 SYNTRAK REPEATER UNIT 10-309501
1 SYNTRAK QC SYSTEM 10-308301
1 UNINTERRUPTIBLE POWER SUPPLY UNIT 1040S/25
1 UNINTERRUPTIBLE POWER SUPPLY UNIT AST 3350/380/60
UMBILICAL REEL ACCESSORIES, STRIVERS
4 HAMWORTHY COMPRESSORS 4TH565W100
1 MAGNAVOX INTEGRATED NAVIGATION SYSTEM
1 HYDROLINK SYSTEM





                                      83
<PAGE>   90
SIGNED by                                          )
for and on behalf of                               )
ROYAL BANK OF SCOTLAND                             )        /s/ Andrew
Robertson (INDUSTRIAL LEASING) LIMITED             ) 
in the presence of:                                )

[illegible name]
Royscot House
Cheltsham


SIGNED by                                          )
for and on behalf of                               )
SIMON-HORIZON LIMITED                              )        /s/ B.E. Timmins in
the presence of:                                   )

Judith Kelbilt
Berwin Height
Soliciters
Adelaide House
London Bridge
London EC4





                                      84

<PAGE>   1
                                                                 EXHIBIT 10.9.11





                              DATED 31 MARCH 1992



              ROYAL BANK OF SCOTLAND (INDUSTRIAL LEASING) LIMITED

                             SIMON-HORIZON LIMITED




                            ADDENDUM TO CHARTERPARTY
                             M.V. "SIMON LABRADOR"





                                  Norton Rose
                                     London
<PAGE>   2
THIS ADDENDUM dated 31 MARCH 1992 is supplemental to a CHARTERPARTY BY WAY OF
DEMISE in respect of m.v. "SIMON LABRADOR" (therein called m.v. "SEAWAY
LABRADOR") (the "Ship"), dated 20th December 1990 (hereafter the
"Charterparty") BETWEEN:

(1)      ROYAL BANK OF SCOTLAND (INDUSTRIAL LEASING) LIMITED (the "Owner"); and

(2)      SIMON-HORIZON LIMITED (the "Charterer")

WHEREAS

(1)      the Charterer wishes new seismic survey equipment (the "Equipment") to
         be installed on the Ship and has asked the Owner to assist in the
         finance of the Equipment,

(2)      the Owner and the Charterer have entered or will enter into sale and
         purchase agreements relating to the Equipment whereby the Equipment
         will be sold from the Charterer to the Owner,

(3)      the Owner and the Charterer have agreed to enter into a master lease
         and lease contracts executed pursuant thereto in respect of the
         Equipment whereby the Equipment shall be leased from the Owner to the
         Charterer and

(4)      the Owner and the Charterer wish the Charterparty to be amended to
         accommodate appropriate references to the Equipment and the
         transaction documentation relating to the Equipment,

NOW, IN CONSIDERATION of the Charterer taking on lease from the Owner the
Equipment pursuant to a master lease and lease contracts executed pursuant
thereto

IT IS HEREBY AGREED that:

1        EFFECTIVE DATE

1.1      The Effective Date shall be the first date of Delivery relating to any
         of the Goods ("Delivery" and "Goods" being as defined in the master
         lease referred to in Recital 3 above).

2        AMENDMENTS TO THE CHARTERPARTY

2.1      The following amendments shall be made to the Charterparty with effect
         from the Effective Date, references to Clauses and Schedules being
         references to Clauses and Schedules of the Charterparty unless
         indicated otherwise herein:
<PAGE>   3
                                      -2-

         (a)     There shall be inserted in the definitions set out in Clause 1
                 the following:

                 "Goods" means any goods the subject of the Goods Contracts;

                 "Goods Contracts" means the Master Lease and the Goods
                 Guarantee;

                 "Goods Guarantee" means the Guarantee entered into in relation
                 to the Master Lease by Simon Engineering plc;

                 "Goods Sale Agreements" means each of or all of (as the
                 context allows) the agreements between the Charterer and the
                 Owner whereby the Owner buys and the Charterer sells any goods
                 which are to become Goods;

                 "Master Lease" means the master lease dated 31-03-92 between
                 the parties hereto and the lease contracts entered into
                 pursuant thereto;

         (b)     There shall be inserted after The Guarantee" in line 2 of the
                 definition of "Relevant Documents" in Clause 1;

                 ", the Goods Contracts".

         (c)     There shall be inserted at the end of the definition of "Ship"
                 in Clause 1;

                 And "Ship" shall indeed Goods while such Goods are on board
                 the Ship, save that where there is reference herein to
                 insurance of the Ship, "Ship" shall not include Goods if the
                 Goods on board the Ship are insured separately from the Ship
                 in accordance with the terms of the Master Lease".

         (d)     There shall be inserted at the end of the definition of
                 Termination Sum" in Clause 1;

                 "in respect of the Ship excluding the Goods".

         (e)     Clause 35 shall be deleted and the following inserted in its
                 place:

                 "Upon the termination of the Charter Period and the sale of
                 the Ship in accordance with the foregoing provisions of this
                 Clause 3, the Net Sale Proceeds shall be applied by the Owner
                 (subject to Clause 10.4) as follows:

                 (a)      The proportion of the Net Sale Proceeds attributable
                          to the Goods shall be calculated and paid to the
                          Owner for application in accordance with the terms of
                          the Master Lease; and the balance shall be applied:
<PAGE>   4
                                      -3-

                 (b)      Firstly, in or towards settlement of any amounts due
                          and owing by the Charterer to the Owner under the
                          Charterparty or any other Relevant Documents other
                          than the Goods Contracts (including any interest due
                          in respect thereof);

                 (c)      Secondly, in settlement of all sums due to the Owner
                          under the Goods Contracts insofar as such sums have
                          not been satisfied by application of the sums
                          referred to in Clause 3.5(a);

                 (d)      Thirdly, if the Charterer shall on or before the date
                          of application of the Net Sale Proceeds by the Owner
                          have paid the Termination Sum, or a part thereof, in
                          accordance with Clauses 3.3 or 3.4, in or towards
                          refunding by way of rebate of charterhire to the
                          Charterer the amount of the Termination Sum or part
                          thereof so paid by the Charterer; and

                 (e)      Fourthly, an amount equal to two per cent. (2%) of
                          the Net Sale Proceeds shall be retained by the Owner
                          and any balance remaining shall be paid to the
                          Charterer by way of rebate of charterhire and/or
                          payment of sales commission or otherwise as
                          appropriate."

                 (f)      There shall be inserted after "BFE" in line 5 of
                          Clause 63;

                          "or the Goods".

                 (g)      A new Clause 7.7 shall be inserted after Clause 7.6:

                          "7.7    Notwithstanding any other Clause of this
                                  Charterparty, payments of charterhire
                                  pursuant to this Charterparty shall be in
                                  respect of the Ship excluding the Goods."

                 (h)      There shall be inserted after "Purchase Agreement" at
                          the end of line 2 of Clause 9.1;

                          "and payment for the Goods".

                 (i)      There shall be inserted after "Conversion and Supply
                          Agreement" in line 7 of Clause 9.5;

                          "and payment for the Goods".

                 (j)      There shall be inserted after "Charterparty" in line
                          8 of Clause 9.6;

                          "the termination of the leasing of the Goods under
                          Clause 3.03 of the Master Lease".
<PAGE>   5
                                      -4-


                 (k)      There shall be inserted after "Technical Records" in
                          line 7 of Clause 20.1;

                          "and the Goods"

                          and there shall be inserted after "Charterparty" in
                          line 10 of that Clause;

                          "or the Master Lease".

         (l)     Clause 21.5 shall be deleted and the following inserted in its
                 place:

                 "All moneys received by the Owner as loss payee under the
                 Insurances from insurers or others in respect of a Total Loss
                 shall be applied by the Owner subject to Clause 10.4 as
                 follows:

                 (a)      the proportion attributable to the Goods shall be
                          paid to the Owner for application in accordance with
                          the terms of the Master Lease; and the balance shall
                          be applied:

                 (b)      Firstly, in or towards settlement of any amounts due
                          and owing by the Charterer to the Owner under this
                          Charterparty or any of the other Relevant Documents
                          other than the Goods Contracts;

                 (c)      Secondly, in settlement of all sums due to the Owner
                          under the Goods Contracts insofar as such sums have
                          not been satisfied by application of the sums
                          referred to in Clause 21.5(a);

                 (d)      Thirdly, if the Charterer shall on or before the date
                          of application of such moneys have paid the
                          Termination Sum, or a part thereof, in accordance
                          with Clause 21.2(a) in or towards refunding by way of
                          rebate of hire or otherwise as appropriate to the
                          Charterer the amount of the Termination Sum or part
                          thereof so paid by the Charterer; and

                 (e)      Fourthly, an amount equal to two per cent. (2%) of
                          such moneys received by the Owner as loss payee under
                          the Insurances shall be retained by the Owner, and
                          the balance shall be paid to the Charterer or to its
                          order by way of rebate of charterhire or otherwise as
                          appropriate."

         (m)     Clause 25.2 shall be deleted and the following shall be
                 inserted in its place:

                 "Without prejudice to the obligation of the Charterer to make
                 the payments referred to in Clause 25.1, upon any such
                 termination as is referred to in Clause 25.1 and provided that
                 the Owner shall not be prevented from so doing for any reason
                 whatsoever, the Owner shall endeavour to sell the Ship as soon
                 as
<PAGE>   6
                                      -5-

         practicable. The Net Sale Proceeds shall be applied by the Owner
         subject to Clause 10.4 as follows:

                 (a)      the proportion of the Net Sale Proceeds attributable
                          to the Goods shall be calculated and paid to the
                          Owner for application in accordance with the terms of
                          the Master Lease; and the balance shall be applied:

                 (b)      Firstly, in or towards settlement of any amounts due
                          and owing by the Charterer to the Owner under this
                          Charterparty or any of the other Relevant Documents
                          other than the Goods Contracts (including any
                          interest due in respect thereof);

                 (c)      Secondly, in settlement of all sums due to the Owner
                          under the Goods Contracts insofar as such sums have
                          not been satisfied by application of the sums
                          referred to in Clause 25.2(a);

                 (d)      Thirdly, if the Charterer shall on or before the date
                          of application of the Net Sale Proceeds by the Owner
                          have paid the Termination Sum, or a part thereof, in
                          accordance with Clause 25.1, in or towards refunding
                          by way of rebate of charterhire or otherwise as
                          appropriate to the Charterer the amount of the
                          Termination Sum or part thereof so paid by the
                          Charterer; and

                 (e)      Fourthly, an amount equal to two per cent. (2%) of
                          the Net Sale Proceeds shall be retained by the Owner
                          and any balance shall be paid to any Relevant Party
                          by way of rebate of charterhire or otherwise as
                          appropriated

         (n)     Clause 1 of Schedule 3 shall become Clause 1.1 of Schedule 3
                 and a new Clause 1.2 as follows shall be inserted at the end
                 of Clause 1.1 of Schedule 3:

                 "1.2     For the purposes of this Schedule 3, references to
                          the Ship shall exclude references to the Goods."

         (o)     The reference to paragraphs 3(i)-(xx) (inclusive) of Schedule
                 3 contained in line 2 of the definition of Variable
                 Assumption. in Clause 1 of Schedule 3, shall be amended to
                 refer to paragraphs 3(i)-(xxA) (inclusive) of Schedule 3.

         (p)     There shall be inserted between paragraphs (xx) and (xxi) of
                 Cause 3 of Schedule 3 the following:

                 "(xxA)   that the Inland Revenue will not treat the respective
                          disposal values of the Ship (excluding the Goods) and
                          the Goods as being any amount different from that
                          assumed by the Owner; and"
<PAGE>   7
                                      -6-


         (q)     Clause 1 of Schedule 4 shall become Clause 1.1 of Schedule 4
                 and a new Clause 1.2 as follows shall be inserted at the end
                 of Clause 1.1 of Schedule 6:

                 "1.2     For the purposes of this Schedule 4, references to
                          the Ship shall exclude references to the Goods."

3        CONTINUING EFFECT

3.1      The Owner and the Charterer agree that subject to the amendments set
         out in Clause 1 hereof the Charterparty shall continue with full force
         and effect.

4        LAW AND JURISDICTION

4.1      This Addendum shall be governed by and construed in accordance with
         the laws of England and the Courts of England shall have non-exclusive
         jurisdiction over matters arising in relation to this Addendum.

IN WITNESS whereof the parties hereto have entered into this Addendum the day
and year first above written

SIGNED by                              )
for and on behalf of                   )   
ROYAL BANK OF SCOTLAND                 )   /s/ Andrew Robertson
(INDUSTRIAL LEASING) LIMITED           )
in the presence of                     )



SIGNED by                              )
for and on behalf of                   )   /s/ B.E. Timmins
SIMON-HORIZON LIMITED                  )
in the presence of                     )





<PAGE>   1

                                                               EXHIBIT 10.9.12


DATED      18th  August                                                   1994
- --------------------------------------------------------------------------------




(1)      SIMON-HORIZON LIMITED



(2)      ROYAL BANK OF SCOTLAND
         (INDUSTRIAL LEASING) LIMITED



(3)      HORIZON EXPLORATION LIMITED


         and


(4)      SIMON ENGINEERING PLC



- --------------------------------------------------------------------------------

                            QUADRIPARTITE AGREEMENT
                        in respect of the chartering of
                         M.V. "Simon Labrador" and the
                           leasing and sub-leasing of
                           certain seismic equipment

- --------------------------------------------------------------------------------
<PAGE>   2
                                       1.

THIS AGREEMENT is made the 18th day of August 1994 BETWEEN:

1.       SIMON-HORIZON LIMITED registered number 467924 whose registered office
         is at Horizon House, Azalea Drive, Swanley, Kent BR8 8JR ("Simon");

2.       ROYAL BANK OF SCOTLAND (INDUSTRIAL LEASING) LIMITED whose registered
         office is at 42 St. Andrew Square, Edinburgh EH2 2YE, Scotland (the
         "Owner");

3.       HORIZON EXPLORATION LIMITED whose registered office is at 6 Pembroke
         Road, Sevenoaks, Kent TN13 1XR ("HEL"); and

4.       SIMON ENGINEERING PLC whose registered office is at Simon House, Bird
         Hall Lane, Stockport, Cheshire SK3 ORJ (the "Guarantor").

WHEREAS:

(A)      The Owner is the sole owner of all the shares in the seismic survey
         vessel M.V. "Simon Labrador" (ex "Seaway Labrador") which is
         registered in the name of the Owner under the Bahamian flag at the
         port of Nassau Commonwealth of the Bahamas with official number 715224
         (the "Vessel") subject to and with the benefit of a charterparty by
         way of demise dated 20th December 1990 (together with an addendum
         thereto dated 31st March 1992 called the "Head Charter") made between
         (1) the Owner and (2) Simon under which the Owner has chartered the
         Vessel to Simon for a primary period expiring on 1st April 2001 on the
         terms and conditions therein contained.

(B)      By a master lease dated 31st March 1992 (the "Head Master Lease") made
         between (1) the Owner and (2) Simon and lease contracts bearing
         numbers RS920/0017 and RS920/0022 also dated 31st March 1992 (the
         "Head Leasing Contracts") made between (1) the Owner and (2) Simon,
         the Owner leased to Simon certain assets and equipment the subject of
         the Head Leasing Contracts (the "Goods") for use on board the Vessel
         on the terms and conditions therein contained.

(C)      Simon has requested the consent of the Owner pursuant to clause 12 of
         the Head Charter to the sub-chartering of the Vessel to HEL and
         pursuant to clause 8.01 of the Head Master Lease to the sub-leasing of
         the Goods.  HEL has also requested that it be appointed agent for the
         sale of the Vessel and the Goods in the place of Simon which the Owner
         and Simon have agreed to upon the terms hereof.

NOW IT IS HEREBY AGREED as follows:

1.       Definitions

1.1      Words and expressions used herein shall have the same meanings as in
         the Head Charter unless defined herein to the contrary or the context
         otherwise requires.  In addition the following expressions shall have
         the following meanings:

         "Cure Period"            means, in respect of a Potential Termination
                                  Event, any period of grace given by the Owner
                                  to HEL in a Default Notice for the remedy of
                                  such Potential Termination Event which period
                                  shall be not less than the relevant period of
                                  grace allowed by clause 24.2 of the Head
                                  Charter and clause 14.02 of the Head Master
                                  Lease for its remedy before the Default
                                  constitutes a Termination Event, and in
                                  respect of an Immediate Termination Event
                                  means five (5) Banking Days (except in the
                                  case of a Default in compliance with any
                                  obligation to insure in which event the Cure
                                  Period shall be one (1) Banking Day)
<PAGE>   3
                                       2.

         "Default"                means an event or circumstance which 
                                  constitutes or which with the giving of 
                                  notice or the passage of time would 
                                  constitute a Termination Event

         "Default Notice"         means a notice from the Owner to Simon and
                                  HEL referred to in clause 4.1 hereof and in
                                  the form or substantially in the form of
                                  Appendix 1 hereto

         "Financial               means any of the events or Termination Event"
                                  circumstances described in sub-clauses (g),
                                  (h), (i), (j), (k), (l), (m) and (n) of
                                  clause 24 of the Head Charter and sub-clauses
                                  (iii), (iv), (v), (vi) and (vii) of clause
                                  14.02 of the Head Master Lease
        
         "Head Lease Documents"   means the Head Charter, the Head Master Lease
                                  and the Head Leasing Contracts as amended
                                  hereby and as the same may be further amended
                                  from time to time

         "HEL Guarantee"          means a joint and several guarantee and 
                                  indemnity to be given by the HEL Guarantors
                                  in favour of the Owner of the obligations of
                                  HEL to the Owner pursuant to the Substituted
                                  Leases in form and substance satisfactory to
                                  the Owner
        
         "HEL Guarantors"         means Horizon Seismic Inc., and Exploration 
                                  Holdings Limited
                                  
         "HEL Termination Event"  means any of the events or circumstances more
                                  particularly described in clause 24 of the
                                  Sub-Demise Charter or clause 14 of the
                                  Sub-Master Lease
        
         "Immediate               means an event or circumstance (other than a 
                                  Financial Termination Event" Termination
                                  Event) which may be relied upon by the Owner
                                  immediately upon its occurrence as
                                  constituting a Termination Event   
        
         "Potential               means an event or circumstance which upon the
                                  expiry of Termination Event" any stated
                                  period of grace would constitute a
                                  Termination Event
        
         "Security Assignment"    means a security assignment of even date
                                  herewith by Simon in favour of the Owner
                                  under the terms of which Simon has assigned
                                  its right, title and interest in and to the
                                  Sub-Lease Documents and insurances relating
                                  to the Ship and the Goods

         "Simon Guarantees"       means the guarantee dated 20th December 1990 
                                  given by the Guarantor in favour of the Owner
                                  of Simon's obligations (inter alia) under the
                                  Head Charter and the guarantee dated 31st
                                  March 1992 given by the Guarantor in favour
                                  of the Owner of Simon's obligations under the
                                  Head Master Lease and the Head Leasing
                                  Contracts;
        
         "Sub-Demise Charter"     means a sub-charter of the Ship by way of
                                  demise between Simon and HEL dated 15th July
                                  1994

         "Sub-Lease Documents"    means the Sub-Demise Charter, the Sub-Master
                                  Lease and the Sub-Leasing Contracts

         "Sub-Leasing Contracts"  means sub-leases of the Goods between Simon
                                  and HEL dated 15th July 1994 pursuant to the
                                  Sub-Master Lease
<PAGE>   4
                                       3.


         "Sub-Master Lease"                means a master lease of the Goods
                                           between Simon and HEL dated 15th
                                           July 1994
                                           
         "Substitute Leases"               means a demise charter of the Ship
                                           and a lease of the Goods by the
                                           Owner to HEL pursuant to clause 4.3
                                           hereof;

         "Termination Event"               means any of the events or
                                           circumstances described in clause 24
                                           of the Head Charter or clause 14 of
                                           the Head Master Lease

         "Termination Sum"                 means at any relevant time the
                                           amount calculated in accordance with
                                           schedule 4 of the Head Charter (as
                                           the same may have been or may be
                                           substituted or amended from time to
                                           time) in respect of the Ship and the
                                           amount calculated in accordance with
                                           clause 14.03 of the Head Master
                                           Lease in respect of the Goods save
                                           that in clause 6 hereof all
                                           references to the Termination Sum
                                           shall have the same meaning as in
                                           the Head Charter.

2.       Consent of Owner

         The Owner hereby consents to the sub-demise chartering of the Ship by
         Simon to HEL and the sub-leasing of the Goods by Simon to HEL in
         accordance with the terms of the Sub-Lease Documents, such consent
         being conditional upon receipt by the Owner of:

         (i)     the Security Assignment duly executed by Simon and all notices
                 consents and acknowledgements relating thereto;

         (ii)    the execution of this Agreement by Simon, HEL and the
                 Guarantor;

         (iii)   resolutions of the board of directors of Simon HEL and the
                 Guarantor approving the execution of this Agreement and of
                 Simon approving the execution of the Security Assignment;

         (iv)    evidence that all consents that may be required by Simon
                 pursuant to any other agreement to which Simon is a party have
                 been obtained; and

         (v)     reimbursement for all costs (including legal costs) and any
                 value added tax payable thereon incurred by the Owner in
                 connection with the granting of such consent and the
                 preparation and negotiation of all documents relating thereto
                 on a full and unqualified indemnity basis.

3.       Subordination

         HEL hereby acknowledges and agrees that its rights under the Sub-Lease
         Documents are in all respects subordinate to the Head Lease Documents
         and the rights of the Owner thereunder and that the exercise by the
         Owner of any of its rights under any of the Head Lease Documents shall
         not in any way be prejudiced or limited by any rights of HEL under the
         Sub-Lease Documents.

4.       Right to cure and substitute charterparty

4.1      If either an Immediate Termination Event or a Potential Termination
         Event occurs under any of the Head Lease Documents, the Owner shall
         give written notice thereof to both Simon and HEL in the form of
         Appendix 1 hereto (a "Default Notice").

4.2      If either:
<PAGE>   5
                                       4.


         (a)     an Immediate Termination Event or a Potential Termination
                 Event has not been cured within the Cure Period prescribed in
                 the Default Notice issued pursuant to clause 4.1; or

         (b)     a Financial Termination Event occurs,

         the Owner may issue to Simon, with a copy to HEL, a notice in the form
         of Appendix 2 hereto (a "Termination Notice") accepting such Default
         as a repudiation of the Head Lease Documents pursuant to clause 25.1
         of the Head Charter and clause 14.03(a) of the Head Master Lease.
         Upon the receipt by Simon of a Termination Notice the following shall
         occur:

         (i)     Simon's right to possess and operate the Ship and to possess
                 the Goods shall terminate and Simon shall pay the Termination
                 Sum to the Owner; and

         (ii)    HEL's right to possess and operate the Ship and to possess the
                 Goods under the Sub-Lease Documents shall terminate but
                 without prejudice to any rights and liabilities of the parties
                 thereto accrued thereunder,

         and the Termination Sum shall be paid by Simon or the Guarantor to the
         Owner within three (3) Banking Days of the date of the Termination
         Notice.

4.3      If any Termination Sum payable by Simon under the Head Lease Documents
         is received by the Owner from Simon or the Guarantor within the time
         specified in clause 4.2 hereof the rights of the Owner and Simon shall
         be as stated in the Head Lease Documents subject only to clause 5
         hereof and HEL shall have no right to a charter of the Ship or a lease
         of the Goods.

4.4      If the Termination Sum is not received by the Owner within the time
         specified in clause 4.2 the Owner shall notify HEL.  HEL may, within
         two (2) Banking Days of notification from the Owner that the
         Termination Sum has not been received, notify the Owner by a notice in
         the form of Appendix 3 hereto (an "Option Notice") that it wishes to
         enter into a new charter of the Ship and a new lease of the Goods from
         the Owner ("Substitute Leases") upon the same terms mutatis mutandis
         as the Head Lease Documents and for the period remaining under the
         Head Lease Documents.  If no Option Notice is received by the Owner
         within such period the provisions of clause 25.2 of the Head Charter
         and clause 14.03(c) of the Head Master Lease shall apply and no sales
         agency shall arise pursuant to clause 5 hereof or any other document.

4.5      Upon receipt of an Option Notice and provided no HEL Termination Event
         shall have occurred the Owner and HEL shall enter into Substitute
         Leases within not more than ten (10) Banking Days of the date of the
         Option Notice provided that the following conditions have been
         complied with to the Owner's satisfaction (which conditions may, if
         the Owner so agrees, be conditions subsequent to the Substitute
         Leases):

         (a)     the HEL Guarantee shall have been executed by the HEL
                 Guarantors and delivered to the Owner;

         (b)     HEL shall have remedied all outstanding Defaults pursuant to
                 the Head Lease Documents (other than Financial Termination
                 Events) and paid or discharged all liabilities owing to the
                 Owner thereunder (other than any liability to pay any
                 Termination Sum thereunder) and any liabilities arising in
                 respect of the period between the date of the Termination
                 Notice and the date of the Substitute Leases had a Termination
                 Notice not been issued; and

         (c)     the Owner shall have received all corporate resolutions, legal
                 opinions and other confirmations that it may require of HEL or
                 otherwise in connection with the Substitute Leases,

         and all costs and expenses including legal costs incurred by the Owner
         in connection with the Substitute Leases and the security therefore
         will be for the account of HEL who shall indemnify the Owner in
         respect
<PAGE>   6
                                       5.

         thereof upon the Owner's first written demand.

4.6      If HEL shall not enter into Substitute Leases on the terms specified
         in clause 4.4 or shall fail to satisfy any of the conditions specified
         in sub-clauses 4.5(a), 4.5(b) or 4.5(c) above within such period of
         ten (10) Banking Days of the date of the Option Notice (or such longer
         period as the Owner may have agreed in its sole discretion) then the
         terms of clauses 4.4 and 4.5 shall cease to apply or be of any further
         effect. In such circumstances the terms of sub-clauses (i) and (ii) of
         clause 4.2 above shall continue to apply and the Owner shall be
         entitled to enforce its rights under the Head Lease Documents (on the
         basis that a Termination Event has occurred and has been accepted as a
         repudiation of the Head Lease Documents by the Owner) without further
         reference to or obligation on HEL but without prejudice to the rights
         and obligations of Simon and HEL as between themselves pursuant to the
         Sub-Lease Documents.

4.7      It is expressly agreed between the parties hereto that nothing
         contained in this clause shall prejudice any of the rights of the
         Owner against Simon under the Head Lease Documents and against the
         Guarantor pursuant to the Simon Guarantees and shall not discharge
         Simon or the Guarantor from any liability arising pursuant thereto or
         affect the right of the Owner to make any claim against Simon or the
         Guarantor pursuant thereto.

4.8      In the event that a Termination Sum is received by the Owner from
         Simon or the Guarantor after the Substitute Leases have been entered
         into, HEL's right to possession of the Ship and the Goods pursuant to
         the Substitute Leases shall cease and the provisions of clause 5.1
         hereof shall apply.

5.       Appointment of HEL as agent for sale of the Ship and the Goods

5.1      In the event that Simon's right to possession of the Ship and the
         Goods terminates either:

         (i)     by effluxion of time pursuant to clause 3.2 of the Head
                 Charter or clause 4(a) of the Head Lease Contracts;

         (ii)    by a voluntary termination by Simon pursuant to clause 3.3 of
                 the Head Charter or clause 3.03 of the Head Master Lease; or

         (iii)   by the occurrence of a Termination Event pursuant to clause 24
                 of the Head Charter or clause 14 of the Head Master Lease,

         and the Owner has received all sums payable pursuant to the Head Lease
         Documents as a consequence thereof including any Termination Sum, the
         Ship and/or the Goods shall be sold by the Owner in accordance with
         the terms of the Head Lease Documents.  For the purpose of any such
         sale and provided that no HEL Termination Event has occurred the Owner
         hereby appoints HEL as its agent (in substitution for Simon) on the
         following terms:

         (a)     HEL will endeavor to arrange the sale of the Ship and the
                 Goods for a cash consideration on the best terms (including
                 price) reasonably obtainable on the open market provided that
                 neither the Ship nor the Goods shall be sold to:

                 (i)      Simon or any person or persons connected with Simon
                          (as the term "connected persons" is used in section
                          839 ICTA) or any person acting in trust for, as
                          nominee of, as agent or otherwise as representative
                          of or on behalf of Simon; or

                 (ii)     HEL or any person connected with HEL or any person
                          acting in trust for, as nominee of, as agent or
                          otherwise as representative of HEL unless the Owner
                          has received prior written confirmation from the
                          Inland Revenue that any such right to purchase the
                          Ship or
<PAGE>   7
                                       6.

                          the Goods would not preclude writing down allowances
                          being made to the Owner under section 24 Capital
                          Allowances Act 1994.  Any such sale shall be on arms
                          length terms;

         (b)     HEL's authority will not extend to concluding a contract for
                 the sale of the Ship or the Goods for which the Owner's
                 specific written authority will be required;

         (c)     the Ship and the Goods shall be offered for sale and for
                 delivery on, or as soon as practicable after, such termination
                 or expiry of the Charter Period or the Lease Period as the
                 case may be and any contract for their sale shall include
                 terms to the following effect:

                 (i)      that all conditions, representations or warranties,
                          expressed or implied by statute or otherwise, whether
                          as to the state or quality of the Ship or the Goods
                          or as to description, fitness for purpose,
                          merchantable quality or otherwise, are, so far as is
                          permitted by law, expressly excluded as between the
                          Owner and the buyer save in respect of the warranty
                          that the Owner shall be passing such title to the
                          Ship and the Goods as the Owner received from Simon
                          free from any Encumbrances created by the Owner; and

                 (ii)     that the sale is conditional upon the Owner first
                          recovering possession of the Ship and/or the Goods;

                 Provided always that nothing in this clause 5.2 shall prevent
                 HEL including any other representations and warranties to be
                 given directly by HEL to a buyer in connection with such sale.

5.2      On a sale of the Ship and/or the Goods HEL shall procure that the sale
         proceeds are paid directly to the Owner.  If the Owner shall have
         received the sale proceeds, the Net Sale Proceeds shall be applied by
         the Owner in accordance with the terms of the Head Charter as amended
         by clause 6 hereof but subject to clause 5.3 hereof.

5.3      Provided that no HEL Termination Event has occurred Simon directs the
         Owner that all rebates of Charterhire payable to Simon pursuant to
         clauses 3.5, 21.5 and 25.2 of the Head Charter as amended by clause 6
         hereof (other than in respect of refunds of the Termination Sum or
         such part thereof as may have been received by the Owner) shall be
         paid to HEL it being Agreed between the Owner and Simon that any
         payment made by the Owner to HEL pursuant to this clause shall be in
         satisfaction of the Owner's obligations to Simon under clauses 3.5,
         21.5 and 25.2 of the Head Charter as amended by clause 6 hereof.  All
         rebates of charterhire in respect of refunds of the Termination Sum or
         part thereof shall be paid to Simon or the Guarantor as the case may
         be depending upon which of them made payment of the same to the Owner.

5.4      The appointment of HEL as agent shall determine upon the earlier of
         (i) the breach by HEL of any of its obligations under this clause 5
         and notice hereof to HEL from the Owner (ii) the occurrence of an HEL
         Termination Event or (iii) the date falling 6 months from the
         termination or expiry of the Charter Period and the Lease Period (the
         "Agency Termination Date").

5.5      If the Ship has not been sold by the Agency Termination Date it shall
         be redelivered to the Owner free from all Encumbrances (other than
         Permitted Encumbrances) at a safe port as may be mutually agreed or,
         in the absence of such agreement, at such safe port in the United
         Kingdom as the Owner may require.  HEL shall at its expense before
         such redelivery make all such repairs and do all such work as may be
         necessary so that the Ship at the date of redelivery shall have
         installed the machinery and other equipment installed on the Ship
         after redelivery from the yard pursuant to the MWB Conversion Contract
         or replacements for the same in accordance with the terms of the Head
         Charter, shall maintain the classification unexpired and shall be in
         as good structure state and condition as at delivery of the Ship by
         the Owner to HEL under the Head Charter, fair, wear and tear and
         changes and alterations properly made as permitted under the Head
         Charter
<PAGE>   8
                                       7.

         excepted.

5.6      If the Goods have not been sold by the Agency Termination Date then
         the Owner will direct HEL to deliver the Goods to a place specified by
         the Owner with all removal, transport, necessary insurance and storage
         costs being payable by HEL.  HEL will ensure that the Goods when so
         delivered shall be complete and in reasonable working condition (fair
         wear and tear excepted). If the Owner has to bear any expenses in
         carrying out the removal and storage of the Goods or remedying any
         defect in them then the Owner shall be entitled to interest at the
         Interest Rate from the time the Owner incurs such expenses until the
         same are reimbursed to the Owner by HEL.

5.7      HEL agrees to indemnify and keep indemnified the Owner against any
         liability, claim, demand, proceeding or expense which may result from
         any claim (whether justified or not) being made against the Owner in
         respect of or concerning the Ship or the Goods by a purchaser of the
         Ship or the Goods or any third party following any sale by HEL as
         agent.

5.8      If the Owner and HEL enter into Substitute Leases in accordance with
         the terms of clause 4.5 above then HEL shall be the agent of the Owner
         for the purpose of effecting a sale of the Ship and the Goods in the
         circumstances and on the conditions more particularly specified in the
         Substitute Leases.

6.       Application of monies

6.1      Clause 3.5 of the Head Charter shall be deleted and the following
         shall be inserted in its place:

         "Upon the termination of the Charter Period and the sale of the Ship
         in accordance with the foregoing provisions of this clause 3 the Net
         Sale Proceeds shall be applied by the Owner (subject to clause 10.4)
         as follows:

         (a)     The proportion of the Net Sale Proceeds attributable to the
                 Goods shall be calculated and paid to the Owner for
                 application in accordance with the terms of the Master Lease:
                 and the balance shall be applied;

         (b)     Firstly, in or towards settlement of any amounts due and owing
                 by the Charterer to the Owner under the Charterparty or any
                 other Relevant Documents other than the Goods Contracts
                 (including any interest due in respect thereof);

         (c)     Secondly, in settlement of all sums due to the Owner under the
                 Goods Contracts insofar as such sums have not been satisfied
                 by application of the sums referred to in clause 3.5(a);

         (d)     Thirdly, if the Owner shall on or before the date of
                 application of the Net Sale Proceeds by the Owner have
                 received the Termination Sum, or a part thereof, in accordance
                 with clauses 3.3 or 3.4, in or towards refunding by way of
                 rebate of charterhire to the Charterer an amount equal to the
                 Termination Sum or such part thereof (provided that the
                 balance of the Net Sale Proceeds is sufficient);

         (e)     Fourthly an amount equal to two per cent (2%) of the Net Sale
                 Proceeds (prior to the deductions Firstly through Thirdly
                 above) shall be retained by the Owner and any balance of the
                 Net Sale Proceeds remaining shall be paid to the Charterer by
                 way of rebate of charterhire and/or payment of sales
                 commission.

6.2      Clause 21.5 of the Head Charter shall be deleted and the following
         inserted in its place:

         "All moneys received by the Owner as loss payee under the insurances
         from insurers or others in respect
<PAGE>   9
                                       8.

         of a Total Loss shall be applied by the Owner (subject to clause 10.4)
         as Follows:

         (a)     the proportion attributable to the Goods shall be paid to the
                 Owner for application in accordance with the terms of the
                 Master Lease: and the balance shall be applied;

         (b)     Firstly, in or towards settlement of any amounts due and owing
                 by the Charterer to the Owner under the Charterparty or any of
                 the other Relevant Documents other than the Goods Contracts;

         (c)     Secondly, in settlement of all sums due to the Owner under the
                 Goods Contracts insofar as such sums have not been satisfied
                 by application of the sums referred to in clause 21.5(a);

         (d)     Thirdly, if the Owner shall on or before the date of
                 application of such moneys have received the Termination Sum,
                 or a part thereof, in accordance with clause 21.2(a), in or
                 towards refunding by way of rebate of hire or otherwise as
                 appropriate to the Charterer an amount equal to the
                 Termination Sum or such part thereof (provided that the
                 balance of the monies received by the Owner as loss payee is
                 sufficient);

         (e)     Fourthly, an amount equal to two percent (2%) of the monies
                 received by the Owner as loss payee (prior to the deductions
                 Firstly through Thirdly above) shall be retained by the Owner
                 and any balance of the monies received by the Owner as loss
                 payee remaining shall be paid to the Charterer by way of
                 rebate of charterhire.

6.3      Clause 25.2 of the Head Charter shall be deleted and the following
         inserted in its place:

         "Without prejudice to the obligation of the Charterer to make the
         payments referred to in clause 25.1 upon any such termination as is
         referred to in clause 25.1 and provided that the Owner shall not be
         prevented from so doing for any reason whatsoever, the Owner shall
         endeavor to sell the Ship as soon as practicable.  The Net Sale
         Proceeds shall be applied by the Owner subject to clause 10.4 as
         follows:

         (a)     The proportion of the Net Sale Proceeds attributable to the
                 Goods shall be calculated and paid to the Owner for
                 application in accordance with the terms of the Master Lease:
                 and the balance shall be applied;

         (b)     Firstly, in or towards settlement of any amounts due and owing
                 by the Charterer to the Owner under this Charterparty or any
                 of the other Relevant Documents other than the Goods Contracts
                 (including any interest due in respect thereof);

         (c)     Secondly, in settlement of all sums due to the Owner under the
                 Goods Contracts insofar as such sums have not been satisfied
                 by application of the sums referred to in clause 25.2(a);

         (d)     Thirdly, if the Owner shall on or before the date of
                 application of the Net Sale Proceeds by the Owner have
                 received the Termination Sum, or a part thereof, in accordance
                 with clauses 25.1, in or towards refunding by way of rebate of
                 charterhire or otherwise as appropriate to the Charterer an
                 amount equal to the Termination Sum or such part thereof so
                 received by the Owner (provided that the balance of the Net
                 Sale Proceeds is sufficient);

         (e)     Fourthly, an amount equal to two per cent (2%) of the Net Sale
                 Proceeds (prior to the deductions Firstly through Thirdly
                 above) shall be retained by the Owner and any balance of the
                 Net Sale Proceeds remaining shall be paid to the Charterer by
                 way of rebate of charterhire and/or payment of sales
                 commission.

7.       Clause paramount
<PAGE>   10
                                       9.


         In the event that there is any conflict between anything contained in
         this Agreement and the terms of the Head Lease Documents the terms of
         this Agreement shall prevail.

8.       Non-derogation of rights

         Nothing contained in this Agreement or in any of the Sub-Charter
         Documents shall detract from or reduce or limit in any way from
         Simon's obligations and liabilities to the Owner pursuant to the Head
         Lease Documentation and the Simon Guarantees shall continue in full
         force and effect.

9.       Governing Law

         This agreement shall be governed by and construed in accordance with
         English law.
<PAGE>   11
                                      10.

                                   APPENDIX 1

         [Royal Bank of Scotland (Industrial Leasing) Limited letterheading]

To:      Simon-Horizon Limited
         Horizon House
         Azalea Drive
         Swanley
         Kent BR8 8JR

and to:

         Horizon Exploration Limited
         6 Pembroke Road
         Sevenoaks
         Kent TN13 1XR

                                                                Date:

Dear Sirs

CHARTER OF M.V. "SIMON LABRADOR" DATED 20TH DECEMBER 1990 BETWEEN (1) ROYAL
BANK OF SCOTLAND (INDUSTRIAL LEASING) LIMITED ("RBL") AND (2) SIMON-HORIZON
LIMITED ("SIMON") (THE "HEAD CHARTER") LEASE OF CERTAIN SEISMIC EQUIPMENT (THE
"GOODS") DATED 31ST MARCH 1992 BETWEEN (1) RBL AND (2) SIMON (THE "HEAD MASTER
LEASE") AND LEASE CONTRACTS BEARING NUMBERS RS290/0017 AND RS920/0022 DATED
31ST MARCH 1992 BETWEEN (1) RBL AND (2) SIMON (THE "HEAD LEASING CONTRACTS")
QUADRIPARTITE AGREEMENT DATED [            ] BETWEEN (1) RBL (2) SIMON AND (3)
HORIZON EXPLORATION LIMITED ("HEL") (THE "AGREEMENT")

Words and expressions used herein shall have the same meanings as in the
Agreement.

We refer to terms of clause 4.1 of the Agreement and hereby give you notice
that [a Potential] [an Immediate] Termination Event has occurred under the Head
Charter, namely [specify default] (the "Default").

If such Default is cured by HEL within [specify Cure Period] days of the date
hereof we shall not issue Simon with a Termination Notice pursuant to clause
4.2 of the Agreement in respect of such Default but without prejudice to our
right to do so in respect of any other default or in respect of such Default
should it reoccur or not be cured to our satisfaction.

Yours faithfully


 .................................
For and on behalf of
Royal Bank of Scotland
(Industrial Leasing) Limited
<PAGE>   12
                                      11.

                                   APPENDIX 2

         [Royal Bank of Scotland (Industrial Leasing) Limited letterheading]

To:      Simon-Horizon Limited
         Horizon House
         Azalea Drive
         Swanley
         Kent BR8 8JR

and to:

         Horizon Exploration Limited
         6 Pembroke Road
         Sevenoaks
         Kent TN13 1XR

                                                                Date:

Dear Sirs

CHARTER OF M.V. "SIMON LABRADOR" DATED 20TH DECEMBER 1990 BETWEEN (1) ROYAL
BANK OF SCOTLAND (INDUSTRIAL LEASING) LIMITED ("RBL") AND (2) SIMON-HORIZON
LIMITED ("SIMON") (THE "HEAD CHARTER") LEASE OF CERTAIN SEISMIC EQUIPMENT (THE
"GOODS") DATED 31ST MARCH 1992 BETWEEN (1) RBL AND (2) SIMON (THE "HEAD MASTER
LEASE") AND LEASE CONTRACTS BEARING NUMBERS RS290/0017 AND RS920/0022 DATED
31ST MARCH 1992 BETWEEN (1) RBL AND (2) SIMON (THE "HEAD LEASING CONTRACTS")
QUADRIPARTITE AGREEMENT DATED [           ] BETWEEN (1) RBL (2) SIMON AND (3)
HORIZON EXPLORATION LIMITED ("HEL") (THE "AGREEMENT")

Words and expressions used herein shall have the same meanings as in the
Agreement.

*        [We refer to the Default Notice dated [           ] and hereby give
you notice that the Default referred to therein has not been remedied to our
satisfaction within the Cure Period stated in the said Default Notice].

*        [It has come to our attention that a Financial Termination Event has
occurred pursuant to the Head Charter namely [specify].].

As a consequence your right to possession of the Ship and the Goods are hereby
terminated.

We hereby require that there be paid to the account specified below within 3
Banking Days hereof the sum of [ ] pursuant to clause 25 of the Head Charter
and the sum of [             ] pursuant to clause 14.03 of the Head Master
Lease.  We reserve our rights to require payment of any other sums that may be
payable to us pursuant to the terms of the Head Lease Documents.

Payment should be made to the following account:
<PAGE>   13
                                      12.


Account name:    Royal Bank of Scotland (Industrial Leasing) Limited
Account number:           12176088
Bank:                     Royal Bank of Scotland PLC
                          45 The Promenade
                          Cheltenham
                          Gloucestershire
                          GL50 1PY

Sort Code:                16-16-13
Ref:                      "Simon Labrador"

Yours faithfully


- ---------------------------------------------------
For and on behalf of
Royal Bank of Scotland (Industrial Leasing) Limited

*        Delete as appropriate
<PAGE>   14
                                      13.

                                   APPENDIX 3

                  [Horizon Exploration Limited letterheading]

To:      Royal Bank of Scotland (Industrial Leasing) Limited
         45 The Promenade
         Cheltenham
         Gloucestershire
         GL50 1PY

                                    Date:                                     19

Dear Sirs

QUADRIPARTITE AGREEMENT DATED [            ] BETWEEN (1) ROYAL BANK OF SCOTLAND
(INDUSTRIAL LEASING) LIMITED ("RBL") (2) SIMON HORIZON LIMITED ("SIMON") (3)
HORIZON EXPLORATION LIMITED ("HEL") AND (4) SIMON ENGINEERING PLC (THE
"GUARANTOR") (THE "AGREEMENT")

Words and expressions used herein shall have the same meanings as in the
Agreement.

We refer to the Termination Notice dated [             ] and hereby confirm
that we wish to enter into a demise charter of the Ship and a lease of the
Goods with you (the "Substitute Leases") on the same terms, mutatis mutandis,
as the Head Lease Documents.

In consideration of your entering into Substitute Leases with us we confirm
that we shall within 10 Banking Days from the date hereof

(1)      deliver to you an executed guarantee of our obligations thereunder
         from Horizon Seismic Inc and Exploration Holdings Limited together
         with appropriate board resolutions.

(2)      remedy all outstanding Defaults pursuant to the Head Lease Documents
         other than Financial Termination Events.

(3)      pay and discharge all liabilities owing to you under the Head Lease
         Documents as at the date of the Substitute Leases (other than the
         liability to pay the Termination Sum) but including any liabilities in
         respect of the period between the date of the Termination Notice and
         the commencement of the Substitute Leases for which Simon would have
         been liable had the Termination Notice not been issued.

(4)      deliver to you all corporate resolutions legal opinions and other
         confirmations that you may require in connection with the Substitute
         Leases.

and shall indemnify you in respect of all costs and expenses including legal
costs incurred by you in connection with the Substitute Leases and the security
therefor.

Yours faithfully


- ---------------------------
For and on behalf of
Horizon Exploration Limited
<PAGE>   15
                                      14.

IN WITNESS whereof the parties have executed this instrument as a deed and have
delivered it upon dating it.


Signed as a deed by ROYAL BANK           )                                      
OF SCOTLAND (INDUSTRIAL LEASING)         )                                      
LIMITED acting by             ,          )        /s/ [illegible signature]     
a director and                ,          )        Director                      
a director/its secretary                 )                                      
                                                                                
                                                  /s/ [illegible signature]     
                                                  Director                      
                                                                                
                                                                                
                                                                                
                                                                                
Signed as a deed by SIMON-HORIZON        )                                      
LIMITED acting by John Greener,          )                                      
its duly authorised attorney             )        /s/ John Greener              
under a power of attorney dated          )        Simon-Horizon Limited         
           August 1994 in the            )        by its duly authorised        
presence of:                             )        attorney John Greener         
                                                                                
                                                                                
Signature of witness:                             /s/ M.A. Ferrett              
                                                                                
Name:                                             M.A. Ferrett                  
                                                                                
Address:                                          10B Kingswood Road, Shortlands
                                                  Bramley, Kent BR2 ONJ         
                                                                                
Occupation:                                       Director                      
                                                                                
Signed as a deed by SIMON                )                                      
ENGINEERING PLC acting by                )                                      
             , its duly authorised       )        /s/ [illegible signature]     
attorney under a power of                )        Simon Engineering Plc         
attorney dated         August 1994       )        by its duly authorised        
in the presence of:                      )        attorney                      

Signature of witness: /s/ Richard Carr

Name:  Richard Carr

Address:   46 Sutton Road
         London N10 1HE

Occupation:  Company Secretary
<PAGE>   16
                                      15.
Signed as a deed by HORIZON              )
EXPLORATION LIMITED acting by            )        -----------------------------
              , a director and           )        Director
              , a director/ its          )
secretary                                )
                                                  -----------------------------
                                                  Director/Secretary






<PAGE>   1
                                                              EXHIBIT 10.9.13


Dated                           15th July, 1994                             1994

- --------------------------------------------------------------------------------
                                        


                      (1)      SIMON-HORIZON LIMITED


                      (2)      HORIZON EXPLORATION LIMITED




- --------------------------------------------------------------------------------

                            MASTER LEASING AGREEMENT

- --------------------------------------------------------------------------------





                               SIMMONS & SIMMONS
                               14 DOMINION STREET
                                LONDON EC2M 2RJ
<PAGE>   2
                            MASTER LEASING AGREEMENT

THIS MASTER LEASING AGREEMENT is made the 15th July, 1994 BETWEEN:

1.       Simon-Horizon Limited whose registered office is at Horizon House,
         Azalea Drive, Swanley, Kent, BR8 8JR ("Simon")

2.       Horizon Exploration Limited whose registered office is at 6 Pembroke
         Road, Sevenoaks, Kent TN13 1XR (the "Lessee")

WHEREBY IT IS AGREED as follows:

1.       DEFINITIONS

1.01     In this Master Leasing Agreement the terms defined in or for the
         purposes of the Charter shall have the same meanings when used herein
         unless otherwise defined below and the following terms shall have the
         meanings given below:

         Term                              Meaning

         "Accounting Period"               an accounting period within the
                                           meaning of Section 12 of the Income
                                           and Corporation Taxes Act 1988

         "CAA"                             the Capital Allowances Act 1990

         "Calculation Rates"               the standard rates of corporation
                                           tax, applicable to the Rental during
                                           the Primary Period as stated in the
                                           Lease Contract

         "Charter"                         the charterparty by way of
                                           sub-demise in respect of the ship MV
                                           "Simon Labrador" (ex MV "Seaway
                                           Labrador") between the parties
                                           hereto and of even date herewith

         "Delivery"                        the time at which the Lessee takes
                                           possession of the Ship under the
                                           Charter as stated in the Protocol of
                                           Delivery and Acceptance signed by
                                           Simon and the Lessee

         "Disposal Periods"                the accounting period of the Owner
                                           in which the Primary Period comes to
                                           an end

         "Effective Date"                  the date so defined in and for the
                                           purposes of the Agreement

         "Event of Default"                any of the events specified in
                                           Clauses 14.01 or 14.02
<PAGE>   3
         "Goods"                           in relation to each Lease Contract,
                                           the goods specified in Schedule I
                                           thereof or any of them together with
                                           all replacements, renewals and
                                           component parts thereof and all
                                           additions and accessories thereto
                                           which form an integral part thereof

         "Goods Capital                    means the amount of the Owner's
         Outstanding"                      investment in the relevant Lease
                                           Contract from time to time

         "Interest Rate"                   the interest rate calculated as
                                           specified in Clause 15

         "Lease Contract"                  a contract for the sub-leasing of
                                           Goods entered into between Simon and
                                           the Lessee pursuant to this Master
                                           Agreement

         "Lease Period"                    the period from the entering into of
                                           a Lease Contract until the Prime
                                           Date plus the Primary Period and
                                           (unless the context does not so
                                           admit) the Secondary Period or until
                                           the leasing of the Goods under such
                                           Lease Contract terminates for any
                                           reason

         "Master Agreement"                this Master Leasing Agreement

         "Original Cost"                   the expenditure incurred by the
                                           Owner, exclusive of recoverable
                                           value added tax (or other tax
                                           relating to the purchase of the
                                           Goods), on acquisition of the Goods
                                           as specified in Clause 3 of the
                                           relevant Lease Contract

         "Owner"                           Royal Bank of Scotland (Industrial
                                           Leasing) Limited and includes its
                                           successors and assigns

         "Primary Period"                  the primary period of leasing
                                           starting as specified in the
                                           relevant Lease Contract and
                                           terminating subject to the terms and
                                           conditions of the Charter and this
                                           Agreement, on 1st April 2001

         "Prime Date"                      the date specified in the relevant
                                           Lease Contract as the date on which
                                           the Primary Period commences

         "RBS Master Leasing               the Master Leasing Agreement dated
         Agreement"                        31st March 1992 and made between the
                                           Owner and Simon





                                       2
<PAGE>   4
         "RBS Lease Contracts"             means the contracts for the Leasing
                                           of Goods by the Owner to Simon made
                                           pursuant to the RBS Master Leasing
                                           Agreement

         "Rental"                          the rental payable by the Lessee for
                                           the use of Goods under the Lease
                                           Contract as the same may be from
                                           time to time adjusted, increased or
                                           supplemented pursuant to Clause 5 of
                                           this Master Agreement

         "Rental Period"                   the period specified in the Lease
                                           Contract in respect of which a
                                           payment of rental is due

         "Return"                          a profit take out rate of return,
                                           such rate being equivalent to a rate
                                           of interest and being the rate at
                                           which the Owner assumes in relation
                                           to any relevant RBS Lease Contract
                                           relating to Goods the subject of a
                                           Lease Contract that profit will be
                                           withdrawn by the Owner at annual
                                           intervals during the investment
                                           period of such RBS Lease Contract
                                           (relating to such Goods) in
                                           proportion to the investment in such
                                           RBS Lease Contract and after taking
                                           account of taxation

         "Secondary Period"                any period starting at the same time
                                           as the secondary period under the
                                           Charter (therein defined as the
                                           "Secondary Period") and, subject to
                                           the terms of this Master Agreement
                                           and the Charter, coterminous with
                                           such secondary period

         "Site"                            the Ship

         "Supplier"                        the supplier of any of the Goods
                                           referred to in the relevant Lease 
                                           Contract

         "Termination Sum"                 in relation to a Lease Contract the
                                           amount, calculated in accordance
                                           with Clause 14.03, payable by the
                                           Lessee to Simon upon termination of
                                           the Lease Contract prior to the end
                                           of the Primary Period

1.02     References in this Master Agreement to Clauses and Schedules are,
         unless the context otherwise requires, to Clauses of and Schedules to
         this Master Agreement.





                                       3
<PAGE>   5
2.       REPRESENTATIONS AND WARRANTIES

2.01     The Lessee represents and warrants to Simon that:

                 (a)      there has been no material adverse change in the
                          financial position of the Lessee from that set forth
                          in the latest audited financial statements delivered
                          to Simon under Clause 11.1(d) of the Charter;

                 (b)      every consent, authorisation, license or approval of,
                          or registration with, or declaration to, governmental
                          or public bodies or authorities or courts required by
                          the Lessee to authorise, or required by the Lessee in
                          connection with the execution, delivery, validity,
                          enforceability or admissibility in evidence of this
                          Master Agreement and any Lease Contract, or the
                          performance by the Lessee of its obligations under
                          this Master Agreement and any Lease Contract has been
                          obtained or made and is in full force and effect, and
                          there has been no default in the observance of the
                          conditions or restrictions (if any) imposed in, or in
                          connection with, any of the same;

                 (c)      the obligations of the Lessee under the Goods
                          Contracts are direct, general and unconditional
                          obligations of the Lessee and rank at least pari
                          passu with all other present and future unsecured and
                          unsubordinated obligations (including contingent
                          obligations) except as are mandatorily preferred by
                          law and not by contract;

                 (d)      the Lessee is not (nor would with the giving of
                          notice or lapse of time or both be) in breach of or
                          in default under any agreement relating to
                          Indebtedness to which it is a party or by which it
                          may be bound;

                 (e)      all information, exhibits ant reports furnished by
                          the Lessee to Simon in connection herewith or with
                          the negotiation and preparation of this Master
                          Agreement are true and accurate in all material
                          respects and not misleading, do not omit material
                          facts and all reasonable enquiries have been made to
                          verify the facts and statements contained therein;
                          there are no other facts the omission of which would
                          make any fact or statement therein misleading;

                 (f)      no Relevant Event has occurred and is continuing;

                 (g)      the Goods are and will on Delivery be free from all
                          Encumbrances other than Permitted Encumbrances; and





                                       4
<PAGE>   6
                 (h)      neither the Lessee's interest in the insurances
                          relating to the Goods or any Requisition Compensation
                          nor any part thereof will on Delivery be subject to
                          any Encumbrances save for any Permitted Encumbrance.

3.       LEASE CONTRACTS

3.01     Simon shall lease to the Lessee and the Lessee shall take on lease the
         Goods for the Lease Period. Provided however that the obligation of
         Simon to lease the Goods to the Lessee under this Master Agreement or
         any Lease Contract is subject to the conditions that, (a) on Delivery
         Simon shall have received the documents and evidence specified in
         Schedule 1 in form and substance satisfactory to Simon and (b) on the
         date Delivery is to take place the representations and warranties set
         out in Clause 2.01 (a)-(f) (inclusive) of the Charter are and remain
         true and correct in all respects and (c) no Relevant Event would arise
         by reason of Delivery taking place.

3.02     The lease of the Goods under each Lease Contract shall start on the
         date on which the Lease Contract is entered into by the Lessee; the
         Primary Period shall commence on the Prime Date and irrespective of
         all other provisions hereof all the obligations of the Lessee
         hereunder as regards any Goods shall commence on Delivery.

3.03     Subject to the Lessee indemnifying Simon for all losses, costs and
         expenses incurred by Simon as a result of such termination, the Lessee
         shall be entitled on giving to Simon not less than one hundred and
         fifty (150) days notice (which notice, when given, shall be
         irrevocable) to terminate the Lease Period of the Goods on any date
         falling on or after the first anniversary of the Start Date.  Upon
         such termination (which shall be called "Voluntary Termination"
         herein) the Lessee shall re-deliver the Goods to Simon in accordance
         with Clause 13 and shall pay to Simon an amount equal to the
         Termination Sum on the date of such termination, calculated in
         accordance with Clause 14.03 together with all amounts of Rentals and
         other moneys then due and owing to Simon under this Agreement.

         (In the event that the Lessee serves a notice of voluntary termination
         under Clause 3.3 of the Charter it shall be deemed that a notice of
         Voluntary Termination shall have been served to terminate the Lease
         Period of the Goods on the same date as the Charter Period of the Ship
         is due to terminate under such notice of voluntary termination).

3.04     The terms of this Master Agreement shall be deemed to be incorporated
         into the terms of each Lease Contract provided that in the event of
         any conflict between the terms hereof and the terms specified in a
         Lease Contract the latter shall prevail.  Each Lease Contract shall be
         deemed to form a separate agreement for the lease of the Goods therein
         described but so that any breach of the provisions of this Master
         Agreement or any Lease Contract for the time being in force shall be
         deemed to be a breach of this





                                       5
<PAGE>   7
         Master Agreement and of every such Lease Contract in force between the
         parties hereto.

3.05     The Lessee's right to use the Goods is conditional upon the due
         performance by the Lessee of its obligations hereunder and every Lease
         Contract, subject to which, the Lessee shall be entitled peaceably to
         hold and use the Goods without interference from Simon or any person
         claiming title through Simon. If the Owner shall be in breach of the
         Owner's obligations pursuant to Clause 3.05 of the RBS Master Inuring
         Agreement, Simon will at the cost and request of the Lessee take such
         steps as the Lessee may reasonably require to enforce Simon's rights
         against the Owner to have such breach remedied.

3.06     Provided that the Lessee has duly performed all of the terms and
         conditions of each Lease Contract and that no Event of Default has
         occurred the leasing of Goods under a Lease Contract shall continue
         after the end of the Primary Period until the termination of the
         Secondary Period under the Charter.

3.07     The Lessee hereby warrants and undertakes to Simon that no leasing of
         the Goods under any Lease Contract shall be within the scope of or
         regulated by the Consumer Credit Act 1974 (or as amended, replaced,
         extended or re-enacted from time to time) or any similar legislation
         or regulatory controls. In the event that the Goods or any Lease
         Contract are or become subject to such statutory controls, and the
         same shall materially affect the rights of Simon hereunder, Simon
         shall be entitled to terminate the relevant Lease Contract and the
         provisions of Clause 13 of this Master Agreement shall apply mutatis
         mutandis as though an Event of Default had occurred.

4.       DELIVERY OF GOODS

4.01     All risk of loss of or damage to the Goods shall as between Simon and
         the Lessee pass to the Lessee in accordance with the terms of the
         Agreement.  Delivery of the Goods shall occur at the same time as
         Delivery of the Ship occurs under the Charter and the Goods shall be
         held by the Lessee subject to and in accordance with the provisions of
         this Master Agreement and the Lease Contracts.

4.02     The Lessee acknowledges that prior to Delivery the Charterer has in
         accordance with management arrangements with Simon conducted its
         seismic survey business on and by use of the Ship through the services
         of its own employed personnel and has thereby had sufficient
         opportunity to carry out any inspections of the Ship, her condition
         and any and all Goods and the condition of the Goods on delivery to
         the Lessee shall be the sole responsibility of the Lessee, and the
         Lessee shall not be entitled for any reason whatsoever to refuse to
         accept delivery of the Goods and Simon shall not be liable for any
         loss or expense, or any loss of profit, resulting directly or
         indirectly from any defect or alleged defect in the Goods or failure
         or alleged failure of the Goods to comply in all respects with the
         terms of the RBS Lease Contracts and the RBS Master





                                       6
<PAGE>   8
         Leasing Agreement and the Lessee agrees that upon delivery the Lessee
         shall accept the Goods "as is, where is" and shall indemnify and hold
         Simon harmless in respect of any failure of any Goods to comply with
         the terms of any of the RBS Lease Contracts and the RBS Master Leasing
         Agreement.

4.03     The liability of the Lessee to pay rent under any Lease Contract shall
         not be affected by any defect or shortage in the Goods which are the
         subject thereof discovered on Delivery.

5.       RENTALS AND TAXES

5.01     The Lessee shall pay to Simon in respect of the lease of the Goods the
         Rentals and other payments specified in the Lease Contract relating
         thereto.

5.02     Rentals shall be due and payable at the times and for the periods
         specified in the Lease Contract.

5.03     The Lessee shall not be entitled to withhold payment of Rentals or to
         any remission of Rentals in respect of any period during which the
         Goods are unusable or unserviceable and Simon shall not be liable to
         provide the Lessee with any replacement goods during any such period.

5.04     (a)     The Rentals have been calculated on the following assumptions
                 ("Assumptions"):

                 (i)      that all rentals to be received by the Owner pursuant
                          to the RBS Lease Contracts will for tax purposes be
                          accrued over the period to which they relate, by
                          reference to the relevant Leasing Contract;

                 (ii)     that there will be available to the Owner in respect
                          of the Accounting Period of the Owner during which
                          the Original Cost is incurred a 25% writing down
                          allowance and in each subsequent Accounting Period in
                          which the Goods continue to be leased by the Owner to
                          Simon a writing down allowance at the rate of 25% per
                          annum (or at the rate specified in the Leasing
                          Contract, if different) on a reducing balance basis
                          all as provided by Section 24 of the CAA in force as
                          at the date thereof, and that the capital allowances
                          so available will not be withdrawn either wholly or
                          in part, and that there will be no delay in the
                          agreement of the Owner's claim for said allowances;
                          and

                 (iii)    that any losses arising to the Owner in respect of
                          the said allowances will be available for surrender
                          by way of group relief in accordance with the
                          provisions of Chapter IV of Part X of the Income and





                                       7
<PAGE>   9
                          Corporation Taxes Act 1988 (as amended, and in force,
                          as at the date hereof); and

                 (iv)     that the standard rate of United Kingdom corporation
                          tax is and will continue to be fixed at the
                          Calculation Rates specified in the Lease Contract;
                          and

                 (v)      that the Goods will be sold in the Accounting Period
                          of the Owner in which the Primary Period expires by
                          effluxion of time and that the amount which the Owner
                          is required to bring into account as disposal value
                          on such sale in accordance with section 24(6) CAA
                          will be the balance of the Original Cost on which
                          writing down allowances are assumed to be available
                          for that Accounting Period by Assumption 5.04(a)(ii)
                          above; and

                 (vi)     that any interest paid or assumed to be paid in
                          respect of funds borrowed or assumed to be borrowed
                          by the Owner for the purpose of this transaction is
                          or would had it actually been paid have been allowed
                          as a trading expense or as a charge on income in the
                          Accounting Period of the Owner to which such interest
                          relates or is paid (or assumed to be paid); and

                 (vii)    that in the "requisite period" (as that expression is
                          defined in section 40 CAA) the Goods will not be used
                          for a purpose which results in section 42 CAA
                          applying; and

                 (viii)   that, in relation to Original Cost, no charge will
                          arise under section 46 CAA in respect of any excess
                          relief (as therein defined) or under section 42 CAA
                          as the same may be amended, extended, substituted or
                          replaced from time to time; and

                 (ix)     that the Owner would incur professional fees and
                          disbursements of L.5 per L.1000 of Original Cost
                          (exclusive of Value Added Tax) in respect of the
                          transaction contemplated by the RBS Lease Contract
                          excluding the funding arrangements; and

                 (x)      that the fees incurred by the Owner referred to in
                          Assumption (ix) above would be deductible as a
                          trading expense in the Accounting Period of the Owner
                          in which such fees are payable; and

                 (xi)     that the interest assumed to be received and paid in
                          Assumption 5.04(a)(xiii) will be treated as accruing
                          on a daily basis for the purpose of Corporation Tax
                          and will be accrued on positive or negative balances





                                       8
<PAGE>   10
                          of Goods Capital Outstanding (as the case may be)
                          until the Final Date; and

                 (xii)    (1)     that all losses arising in an Accounting
                                  Period of the Owner as referred to in
                                  Assumption 5.04(a)(iii) will be surrendered
                                  to members of the Owner's Group;

                          (2)     that the Owner will receive payments for
                                  group relief on the date for payment of
                                  Corporation Tax that no refund of such
                                  payments shall be made by the Owner and that,
                                  in accordance with section 402(6) ICTA, such
                                  payments will not be taken into account
                                  (either as a receipt or a deduction) for
                                  Corporation Tax purposes; and

                 (xiii)   that on the Interest Payment Date in respect of each
                          Interest Reference Period during which the Goods
                          Capital Outstanding is

                          (i)     a negative figure the Owner will pay interest
                                  calculated on a daily basis using a 365 day
                                  year on the daily balances of Goods Capital
                                  Outstanding during such Interest Reference
                                  Period at the Reference Rate; or

                          (ii)    a positive figure the owner will receive
                                  interest calculated on a daily basis using a
                                  365 day year on the daily balances of Goods
                                  Capital Outstanding during such Interest
                                  Reference Period at a rate of 7 per cent per
                                  annum; and

                 (xiv)    that the interest referred to in Assumption
                          5.04(a)(xiii) will be payable to a person carrying on
                          a bona fide banking business in the UK;

                 (xv)     that any rebate of rentals made by the Owner to Simon
                          pursuant to Clauses 14.02(c) or 16.06 or 17.02 of the
                          RBS Master Leasing Agreement will be an allowable
                          deduction in the accounting period of the Owner in
                          which the Termination Sum is paid for the purposes of
                          computing the Owner's corporation tax liability; and

                 (xvi)    that the Owner will not be required to bring into
                          account any disposal value for the purposes of
                          calculating a balancing allowance or charge in
                          respect of the Goods other than a disposal value
                          equal to the net proceeds of sale and/or insurance
                          proceeds of the Goods; and

                 (xvii)   that no change occurs in the nature, method or
                          application of any relevant United Kingdom taxation
                          by reason of any enactment, provision,
                          interpretation, practice or ruling of or by an
                          authority,





                                       9
<PAGE>   11
                          whether legislative, judicial, administrative or
                          revenue, after the date of this Agreement; and

                 (xviii)  that the Goods leased under each RBS Lease Contract
                          will be treated independently of any of the Owner's
                          other Goods, for the purposes of calculating the said
                          allowances, and any balancing allowance or charge
                          arising on disposal;

                 (xix)    any other additional Assumptions detailed in the RBS
                          Lease Contracts are correct; and

                 (xx)     that the Inland Revenue will not treat the respective
                          disposal values of the Ship (excluding the Goods) and
                          the Goods as any amount different from that assumed
                          by the Owner; and

         (b)     If, and as often as, any of the Assumptions other than
                 Assumptions (xiii), (xiv) and (xviii) on the basis of which
                 the Rentals are calculated proves to be incorrect during the
                 Primary Period with the result that the Return, in relation to
                 any Goods, is altered the amounts of those Rentals or
                 Termination Sum (as the case may be) which fall due after the
                 relevant Assumption has proved to be incorrect shall be
                 adjusted either upwards or downwards by such amount as the
                 Owner shall certify in writing to Simon (which certificates
                 shall be conclusive in the absence of manifest error and
                 copies of which Simon will forward to the Lessee) to be the
                 amount required to ensure that the Return of the Owner, in
                 relation to those Goods, is the same as it would have been had
                 the relevant Assumption (and all other such Assumptions)
                 proved to be correct.

         (c)     If any of the Assumptions on the basis of which the Rentals
                 are calculated proves to be incorrect with the result that the
                 Return, in relation to any Goods, is altered after the expiry
                 or termination of the Primary Period or at a time when no
                 further Rentals or Termination Sum in relation to those Goods
                 fall due a further payment of rental or Termination Sum (as
                 the case may be) or a rebate of rental or Termination Sum (as
                 the case may be) shall become due of such amount as the Owner
                 shall certify in writing to Simon (which certificate shall be
                 conclusive in the absence of manifest error and copies of
                 which Simon will forward to the Lessee) to be the amount
                 required to ensure that the Return in relation to those Goods
                 is the same as it would have been had the relevant Assumption
                 (and all other such Assumptions) proved to be correct.

         (d)     An Assumption will be deemed to have been proved to be
                 incorrect either upon the receipt of written notification from
                 the Inland Revenue or, in the case of an Assumption changing
                 due to a change in legislation, on the date that such
                 legislation comes into force.





                                       10
<PAGE>   12
         (e)     Simon shall be under no obligation to reduce the Rental if it
                 transpires that the Owner is entitled to capital allowances at
                 a rate in excess of that stated in Clause 5.04 (a) (ii) above
                 or in the Lease Contract (as may be amended).

5.05     All payments of Rentals and all other payments due under this
         Agreement or any Lease Contract shall be made in sterling without
         prior demand and without any right of set-off or counterclaim and free
         and clear of all deductions or withholdings whatsoever unless the same
         are required by law in which event the Lessee undertakes to pay to
         and/or indemnify Simon for such additional amounts as may be necessary
         in order that the net amounts received by Simon after all deductions
         and withholdings shall not be less than such payments would have been
         in the absence of any requirement to make any deduction or
         withholding.

5.06     The Lessee shall pay to Simon at the rates applicable all Value Added
         Tax on the Rentals and other payments due under the Master Agreement
         or any Lease Contract and any other taxes assessments or charges
         levied against or payable by Simon on account of the RBS Lease
         Contracts or by the Owner on account of its ownership of the Goods or
         the leasing, use or operation thereof or the Rentals or other sums
         payable in respect thereof excluding however any taxes payable on the
         net income of Simon and/or the Owner.

5.07     Payment of Rentals shall be made in the manner specified in the Lease
         Contract.  Time of payment shall be of the essence as regards all
         Rentals and other payments payable to Simon hereunder or under any
         Lease Contract.

5.08     The Lessee undertakes promptly upon demand by Simon to provide Simon
         or the Owner with such certificate and/or information as Simon or the
         Owner may reasonably request from time to time to enable the Owner to
         claim any allowances in respect of its expenditure on the Goods and to
         remain entitled to such allowances.

5.09     For the purposes of United Kingdom taxation and irrespective of the
         accounting treatment to be adopted by the Lessee, the Lessee shall not
         claim capital allowances on the Goods.

6.       LOCATION, USE AND MAINTENANCE OF GOODS

6.01     Notwithstanding the provisions of the Charter, the Goods shall be
         located at the Site and shall not be removed therefrom during the
         Lease Period without the prior consent in writing of Simon and the
         Owner except as may be required in the ordinary course of operating
         and maintaining the Ship.

6.02     Without prejudice to the terms of the Charter the Lessee shall use the
         Goods in a careful and proper manner and in accordance with any
         operating instructions issued in respect thereof by the Supplier
         thereof.  The Lessee shall not permit the Goods to be





                                       11
<PAGE>   13
         used for any purpose for which they are not designed or for any
         unlawful purpose.  The Lessee shall ensure that the Goods are used or
         operated by properly skilled personnel.

6.03     Without prejudice to the terms of the Charter the Lessee shall at all
         times keep the Goods in good repair and condition and in working order
         and shall, at its own expense, replace all worn and damaged parts
         thereof.  For this purpose the Lessee shall, at its own expense, if
         required by Simon and/or the Owner, enter into and maintain in full
         force and effect throughout the Lease Period a maintenance agreement
         in terms approved by Simon and/or the Owner with the Supplier or other
         party approved by Simon and/or the Owner and the Lessee undertakes to
         comply promptly with all its obligations under such agreement.  The
         Lessee shall supply a copy of such agreement to Simon and or the Owner
         if so requested.  The Lessee shall at all times ensure that any repair
         or servicing of the Goods is undertaken by properly skilled and
         qualified persons and in accordance with the instructions or
         recommendations of the Supplier of the Goods.

6.04     (a)     The Lessee shall keep an up-to-date record of the whereabouts
                 of the Goods which it will supply to Simon and/or the Owner on
                 request.

         (b)     The Lessee shall not be obliged to enter into a maintenance
                 agreement as provided by clause 6.03 above, but shall procure
                 that the Goods are properly serviced in accordance with the
                 recommendations of the Supplier thereof.

6.05     The Lessee shall at its own expense obtain and keep in full force and
         effect all permissions, licenses and other authorisations which may at
         any time be required in connection with the possession or use of the
         Goods and/or any premises in which the same are located at any time
         during the Lease Period and the due performance by the Lessee of its
         obligations under this Master Agreement and each Lease Contract and,
         if so requested, shall provide a copy of each thereof to Simon and the
         Owner.  The Lessee shall comply with all statutory and other
         obligations relating to the possession and/or use of the Goods and
         shall at is own expense add to or install with the Goods any safety or
         other equipment required by any applicable law or regulation to be so
         added or installed for the lawful use or operation of the Goods.  If
         any such liability shall be discharged by Simon or the Owner, the
         Lessee shall repay the same to Simon or the Owner (as the case may be)
         on demand with interest calculated at the Interest Rate from the time
         of the same having been discharged until such repayment.

6.06     The Lessee agrees to indemnify and hold harmless Simon from and
         against any and all claims, demands and proceedings brought against
         Simon and/or the Owner in respect of any injury, damage or loss caused
         to persons or property arising directly or indirectly out of the
         possession, operation, transportation or condition of the Goods during
         the Lease Period or out of the ownership of the Goods or out of any
         disposal of the Goods by the Lessee pursuant to Clause 16 or 17 or as
         a result of any claim that





                                       12
<PAGE>   14
         the use of the Goods is an infringement of any patent or intellectual
         property right or otherwise in connection with the Goods.

7.       OWNERSHIP PLATES AND INSPECTION

7.01     The Lessee shall if so requested by Simon or the Owner affix or cause
         to be affixed to the Goods, or any separate part or parts thereof,
         plates or other forms of marking ("Plates") indicating in terms
         approved by the Owner that the Goods are the property of the Owner,
         are leased by the Owner to Simon and are on sub-lease to the Lessee.
         The Lessee shall ensure that such Plates remain so affixed and that
         the same are conspicuous and are at no time removed, obliterated,
         defaced or covered up.

7.02     Simon and/or the Owner or its/their agents or representatives shall at
         all reasonable times have access to the Goods (and for this purpose
         shall be entitled to enter on the Site or on any land or premises on
         or in which the same are reasonably believed to be situated) for the
         purpose of inspecting the same and the Lessee shall provide Simon
         and/or the Owner or its/their agents or representatives with
         reasonable facilities for any such inspection.

8.       PROHIBITION AGAINST DEALING WITH THE GOODS

8.01     The Lessee shall not and shall not purport to sell or offer for sale,
         grant security over, charge, assign, pledge, mortgage, sub-lease or
         otherwise dispose of the Goods or any of them or permit any lien
         (other than a repairer's lien) to arise over any of the Goods or
         sublease or part with possession of any of the Goods without the
         previous written consent of Simon and the Owner.

8.02     The Lessee shall not without the previous written consent of Simon and
         the Owner attach any of the Goods to any land or premises other than
         the Ship so that they become or, in the reasonable opinion of the
         Owner, may become a fixture thereon.

8.03     The Lessee shall during the Lease Period promptly notify (i) the
         holders of any fixed security or floating charge over all or any of
         the goods of the Lessee and (ii) any landlord of the land or premises
         where the Goods are at any time located, that the Goods are the
         property of the Owner and held upon a sub-lease from Simon and the
         Lessee shall provide satisfactory evidence of such notification and,
         where requested by Simon or the Owner, a written acknowledgement from
         the holders of any such security or charge that the Goods and the
         Lessee's leasehold interest therein are not within the scope of any
         such security or charge or from any landlord that the Goods have not
         and will not become a landlord's fixture, and (in the case of a
         landlord of premises in Scotland) are not and will not be secured by
         the landlord's right of hypothec.

8.04     The Lessee further undertakes to give to Simon and the Owner during
         the Lease Period 14 days notice of the proposed creation of any
         security mortgage or charge





                                       13
<PAGE>   15
         created by the Lessee whether fixed or floating over its goods
         generally or over its stocks and/or its machinery or plant and/or over
         any land or premises on or in which the Goods are located and the
         Lessee shall notify Simon and the Owner promptly of any enforcement
         thereof or of the appointment of any receiver of all or part of the
         Goods.

8.05     The Lessee further undertakes that forthwith upon becoming aware of
         the assignment of any security or charge as is referred to in Clause
         8.03 hereof or of the disposal by the landlord of his interest in any
         such land or premises as are there referred to, the Lessee will notify
         the assignee or disponee that the Goods are the property of the Owner
         and held upon a sub-lease from Simon and will provide satisfactory
         evidence of such notifications and, where requested by Simon or the
         Owner, such acknowledgement by the assignee or disponee as is referred
         to in Clause 8.03 hereof.

8.06     The Lessee shall not permit any of the Goods to be seized or taken out
         of its possession or control under any diligence, distress, execution
         or other legal process but if the Goods are so seized or taken the
         Lessee shall promptly notify Simon and the Owner thereof and shall
         indemnify Simon and/or the Owner against all losses costs or charges
         incurred by Simon and/or the Owner by reason thereof in retaking
         possession or otherwise in reacquiring the Goods or in acquiring
         substitutes therefor.

9.       ALTERATION TO THE GOODS

9.01     Subject to due compliance with Clause 6.03 the Lessee shall not
         without the prior written consent of Simon and the Owner make any
         addition alteration or modification to the Goods or attach any
         accessories thereto which cannot be removed without damaging or
         impairing the Goods.  Any accessories so attached whether in breach of
         this provision or otherwise shall automatically, and without prejudice
         to any entitlement of Simon and/or the Owner to damages, become the
         property of the Owner.

10.      WARRANTIES RELATING TO THE GOODS

10.01    It is expressly agreed and acknowledged that no condition, warranty or
         representation of any kind is or has been given by or on behalf of
         Simon or the Owner in respect of any of the Goods.  All conditions or
         warranties expressed or implied by law relating to the specifications,
         quality, description, merchantability or otherwise of the Goods or as
         to their fitness for any purpose are hereby expressly excluded.  The
         Lessee agrees and acknowledges that neither Simon nor the Owner shall
         be liable for any claim, loss, damage, expense or other liability of
         any kind or nature caused directly or indirectly by any of the Goods
         or by any inadequacy thereof for any purpose or by any deficiency or
         defect thereof or the use or performance thereof or any repairs
         thereto or servicing thereof and the Lessee shall not by reason
         thereof be released from any





                                       14
<PAGE>   16
         liability to pay rental or any other payment due hereunder or under
         any Lease Contract.

10.02    Simon will at the expense of the Lessee endeavor to extend to the
         Lessee the benefit of any guarantee, condition or warranty which may
         have been given to the Owner (or Simon) by the Supplier or which is
         implied by law in favor of the Owner (or Simon) provided always
         however that (i) the Lessee is not in default under this Master
         Agreement or any Lease Contract or any other agreement between the
         Owner or Simon and the Lessee (ii) the Lessee fully indemnifies the
         Owner and/or Simon against all costs, claims, damages and expenses
         incurred or which may be incurred in connection with the making of any
         claim thereunder and (iii) the Lessee gives such security in advance
         in respect of such indemnity as the Owner and/or Simon may deem
         appropriate.

10.03    The Lessee acknowledges that the Supplier is not and has not been the
         agent of the Owner or Simon and neither the Owner nor Simon shall be
         bound by any representation or warranty made by or on behalf of the
         Supplier.

11.      INDEMNITY AND INSURANCE

11.01    The Lessee shall from the Effective Date until the end of the Lease
         Period keep the Goods comprehensively insured at the expense of the
         Lessee for an amount equal to whichever is the greater from time to
         time of (a) full replacement value and (b) one hundred and ten per
         cent.  (110%) of the maximum Termination Sum (in the case of a
         variable rate lease, on the Assumption that the base rate specified in
         the Lease Contract will apply throughout the Primary Period) and shall
         indemnify Simon and the Owner in respect of any claim arising out of
         the use or possession of the Goods.  The insurance policies shall be
         taken out with reputable insurers and shall cover (i) all risks of
         loss or damage whatsoever (ii) all third party and public liability
         and (iii) other matters in respect of which the Goods are or the
         Lessee is for the time being required by statute or otherwise to be
         insured.  Such insurance policy shall not have any excess unless
         agreed by the Owner and Simon in writing.  The Lessee shall at all
         times maintain third party and public liability insurance in respect
         of the business carried on by the Lessee in which the Goods are used
         for amounts which are prudent and reasonable having regard to the type
         of business being carried on by the Lessee. Such insurance shall name
         the Owner and Simon as joint assureds and contain an endorsement to
         the effect that the Goods are the property of the Owner (and
         sub-leased from Simon), that all moneys payable under such policy
         shall be payable to or to the order of the Owner and that the Owner
         shall be given 30 days prior notice of any intention of the Lessee or
         the insurance company to cancel the policy or to alter its terms or
         not renew the policy on the same terms.

11.02    The Lessee shall if required produce to the Owner and Simon:





                                       15
<PAGE>   17
         (i)     a cover note in respect of the Goods within 10 days of
                 assuming the risk in the Goods in accordance with the
                 provisions of Clause 3.01 hereof;

         (ii)    the insurance policy within 10 days of its becoming available;

         (iii)   each premium receipt within 10 days of the due date of premium
                 payment;

         (iv)    any amendments to the insurance policy by way of note,
                 endorsement or otherwise forthwith upon notification to the
                 Lessee.

11.03    If the Lessee shall fail to keep the Goods so insured or to produce
         such policy or receipt as aforesaid, the Owner and/or Simon shall be
         entitled, at the expense of the Lessee, to insure the Goods as
         aforesaid and the Lessee shall pay to Simon on demand any sums
         expended by the Owner and/or Simon for such purpose together with
         interest at the Interest Rate accruing on a day to day basis from the
         time of the same having been expended until such payment.

11.04    The Lessee irrevocably authorises the Owner (and/or Simon) to give a
         good discharge to the insurance company for any moneys paid under such
         insurance policy.  The Lessee shall, if so requested by the Owner
         (and/or, where appropriate, Simon), assign to the Owner (and/or Simon)
         or to its (or their) order the rights, claims and benefits arising
         under any such policy and shall indemnify the Owner (and/or Simon) in
         respect of any stamp duty on such assignment.

11.05    If the Goods will be used in any nuclear power station or in any
         nuclear process where the Goods or those using them may be subjected
         to any risk of ionising radiations or contamination by radioactivity,
         then before the leasing of the Goods starts the Lessee shall inform
         Simon in writing and in consultation with Simon shall effect such
         additional insurance cover as Simon may require.

11.06    The Lessee shall ensure that nothing is done or omitted to be done
         which is contrary to the terms of any such policy of insurance or
         which might entitle the insurance company to cancel the policy or
         reduce or avoid any liability thereunder.

11.07    The Lessee shall forthwith notify the Owner and Simon in writing of
         any occurrence which gives rise or might reasonably be expected to
         give rise to a claim under such policy of insurance.  The Lessee shall
         ensure that any claim is made promptly and in accordance with the
         terms of the policy and shall not agree any settlement of a claim
         without the prior written consent of the Owner and Simon.

11.08    If any item specified in the Schedule annexed and executed as relative
         to a Lease Contract as forming part of the Goods for the purposes of
         such Lease Contract becomes a total loss or constructive total loss as
         a result of the Ship becoming a Total Loss or as a result of that item
         being lost, stolen, seized, confiscated, damaged beyond





                                       16
<PAGE>   18
         economic repair or otherwise the hiring of such item shall terminate,
         and on such event the Lessee shall either:

         (i)     acquire a replacement for the lost item of equivalent size and
                 condition acting for this purpose as agent for the Owner, in
                 which event the replacement shall be deemed to be included in
                 the relevant RBS Lease Contract and the relevant Lease
                 Contract for all purposes, the Lessee shall continue to be
                 liable to pay Rental, and other payments in accordance with
                 the Lease Contract and this Master Agreement as if such loss
                 had not taken place, and Simon shall only be liable to
                 reimburse the Lessee in respect of expenditure incurred as its
                 agent to the extent that the Simon receives insurance proceeds
                 in respect of such loss or

         (ii)    notify Simon of such loss and forthwith pay to Simon a
                 Termination Sum calculated by reference to the proportion of
                 the rental attributable to the lost Goods.  All insurance
                 proceeds shall be paid to the Owner and until such Termination
                 Sum is received the obligations of the Lessee under this
                 Master Agreement and the Lease Contract shall continue in all
                 respects and in particular the Lessee shall continue to be
                 liable to pay Rental, and other payments falling due in
                 respect of such lost Goods subject to Clause 11.12 on receipt
                 of the Termination Sum in full Simon agrees to pay to the
                 Lessee any insurance proceeds it receives in respect of the
                 loss of the Goods.

                 Provided always that the Lessee shall only be entitled to
                 acquire replacements under (i) above during the Primary Period
                 in respect of lost items which have an aggregate original cost
                 not exceeding 10% of the total Original Cost for the Goods as
                 specified in the relevant Lease Contract.  If the Original
                 Cost of Goods lost in the Primary Period exceeds such figure
                 then the loss shall be notified to Simon and dealt with in
                 accordance with Assumption (ii) above.

11.09    The Lessee shall be liable to reinstate or repair at its own expense
         Goods which have not become a total loss or a constructive total loss
         provided however that, subject to Clause 11.10 below any insurance
         proceeds which are paid otherwise than in respect of a total loss or a
         constructive total loss of the Goods shall be applied either in or
         towards the cost of reinstating or repairing the Goods to the
         satisfaction of Simon and the Owner or, if the Goods have been so
         reinstated or repaired at the expense of the Lessee, in or towards
         reimbursement of the Lessee for the cost thereof.

11.10    If the Lessee shall be in default of any obligation under this Master
         Agreement or any Lease Contract, such insurance proceeds may, at the
         option of Simon and the Owner, be applied first in or towards payment
         of any amounts then owing by the Lessee to Simon.

11.11    Notwithstanding the other sub-clauses of this Clause 11 if, in the
         event of requisition of the Ship for hire, it is proved to the
         satisfaction of Simon and the Owner that such





                                       17
<PAGE>   19
         requisition is upon terms whereby the requisitioning authority has
         assumed the responsibility of the Lessee to Simon and the Owner to
         indemnify or recompense it in respect of or otherwise to make good all
         losses which would ordinarily be covered by the insurances required to
         be effected by the Lessee under this Agreement, the Lessee shall be
         relieved from its insurance obligations under this Agreement in
         respect of such period of requisition or in the event that the
         requisitioning authority shall have assumed only a partial
         responsibility as aforesaid the insurance obligations of the Lessee
         under this Agreement shall be modified in such a manner and to such
         extent as Simon and the Owner may approve.

11.12    All moneys received by the Owner (or Simon) as loss payee under the
         insurances of the Goods from insurers or others in respect of a Total
         Loss (this sum being, when the Goods are insured as part of the Ship,
         that part of the Insurances in respect of the Goods) shall be applied
         subject to Clause 10.04 of the Charter (which shall be read for this
         purpose as if referring to the Goods Contracts and not the Relevant
         Documents) as follows:

         (a)     Firstly, in or towards settlement of all amounts due and owing
                 by Simon to the Owner under the RBS Master Leasing Agreement
                 or any of the other Goods Contracts (as therein defined);

         (b)     Secondly, if the Lessee shall on or before the date of
                 application of such moneys have paid the Termination Sum, or a
                 part thereof, in accordance with Clause 11.08 in or towards
                 refunding by way of rebate of Rentals or otherwise as
                 appropriate to the Lessee the amount of the Termination sum or
                 part thereof so paid by the Lessee; and

         (c)     Thirdly, an amount equal to two per cent (2%) of such moneys
                 received by the Owner as loss payee under the insurances of
                 the Goods shall be retained by the Owner, and any balance paid
                 to Simon shall be paid by Simon to the Lessee or to its order
                 by way of rebate of Rentals or otherwise as appropriate.

11.13    If the Owner shall require and at any time when the Goods are
         installed on the Ship, Clauses 11.01 to 11.04 shall not apply (save
         for the indemnity contained in Clause 11.01) and the Goods shall be
         insured as part of the Ship in accordance with Clause 16 of the
         Charter provided such insurances clearly show an agreed value for the
         Goods, approved by Simon and the Owner and such insurances are
         otherwise on terms approved by Simon and the Owner.

12.      PROPERTY IN THE GOODS

12.01    The Goods shall at all times throughout the Lease Period remain the
         sole and exclusive property of the Owner (but subject to the leasehold
         interest of Simon) and the Lessee





                                       18
<PAGE>   20
         shall not do or permit to be done anything which could prejudice or
         jeopardise the rights of the Owner or Simon in respect of the Goods.

13.      RETURN OF THE GOODS

13.01    Subject to the provisions of Clause 16 the Lessee shall, at the risk
         and expense of the Lessee, return the Goods to Simon, at such address
         in the U.K. as Simon may require, at the termination of the Lease
         Contract, howsoever occurring, unencumbered and in good working
         condition (reasonable wear and tear only excepted).

13.02    Simon shall be entitled to require the Lessee at the expense of the
         Lessee to store the Goods in a suitable place and in reasonably
         protective conditions for a period not exceeding 180 days following
         the termination of the Lease Contract howsoever arising.  During such
         period the Goods shall not be used, modified or in any way interfered
         with and at the end of such period the Lessee shall return the Goods
         to Simon in accordance with its obligations under Clause 13.01.

13.03    In the event of any breach by the Lessee of the provisions of Clauses
         13.01 or 13.02 Simon and/or the Owner shall be entitled to repossess
         the Goods without notice and for that purpose shall be entitled to
         enter upon any land or premises on or in which the Goods are or are
         reasonably believed to be situated and to remove or sever the Goods.

13.04    Without prejudice to any other remedies or rights which may be
         available to Simon if the Lessee commits any breach of the terms or
         conditions of the leasing of any Goods hereunder and fails to remedy
         the same within 21 days of being required so to do by Simon shall have
         the right immediately to terminate the lease thereof and the
         provisions of this Clause 13 shall thereupon apply.

13.05    Should the Ship be under requisition for hire at the end of the Lease
         Period:

         (a)     the lease of the Goods under this Agreement shall (unless
                 otherwise agreed between the Parties hereto) nevertheless be
                 terminated at such end but without prejudice to the accrued
                 rights of the parties, including, without prejudice to the
                 generality of the foregoing, the obligations of the Lessee
                 contained in Clause 23.3 of the Charter, and Simon shall be
                 entitled to receive and retain any requisition hire payable in
                 respect of the Goods and in respect of the period from the
                 expiry of termination of the Lease Period;

         (b)     the Lessee shall, if it is prevented by reason of the
                 requisition for hire from redelivering the Goods under Clause
                 18 of the Charter or under Clause 13 hereof, be relieved from
                 its obligations so to do, but shall consult with Simon as to
                 the redelivery of the Goods when the Ship is released from
                 such requisition; and





                                       19
<PAGE>   21
         (c)     after such release the Lessee shall be given a reasonable
                 opportunity of removing the Goods.

14.      DEFAULT AND BREACH

14.01    If the Lessee repudiates this Master Agreement by a breach of its
         obligations hereunder and/or under any Lease Contract Simon may by
         notice to the Lessee accept such breach as terminating this Master
         Agreement and all Lease Contracts entered pursuant hereto or as
         terminating any Lease Contract in relation to which any such breach
         has occurred.

14.02    Without prejudice to the generality of Clause 14.01 above Simon and
         the Lessee hereby agree that any of the following events or any of the
         Termination Events shall constitute a repudiatory breach by the Lessee
         of this Master Agreement and each Lease Contract entered into pursuant
         hereto:

         (i)     if the Lessee shall fail to pay any sum payable by it
                 hereunder or under any Lease Contract in full when due or on
                 demand within two (2) Banking Days of such due date or date of
                 demand (as the case may be); or

         (ii)    if the Lessee shall commit or cause to be committed any breach
                 of any other term or condition of this Master Agreement or any
                 Lease Contract provided that in the case of a breach capable
                 of remedy Simon shall have first given written notice to the
                 Lessee specifying the fault or breach complained of and
                 requiring the same to be remedied within fourteen (14) days of
                 the service of the said notice and the Lessee shall have
                 failed to comply therewith; or

         (iii)   if the Lessee shall convene any meeting of creditors or make
                 any assignment or arrangement for the benefit of creditors
                 generally or if a meeting be convened for the purpose of
                 considering a resolution that the Lessee be wound up
                 voluntarily or if the Lessee shall fail to answer the
                 allegations contained in any petition for a winding up of the
                 Lessee followed by an amalgamation or reconstruction on terms
                 approved by Simon or if an order to wind up the Lessee shall
                 be made or if any application for the appointment of an
                 administrator of the Lessee shall be presented or a receiver
                 shall be appointed over all or any part of the Lessee's
                 undertaking or assets; or

         (iv)    if any obligation of the Lessee under any hire purchase or
                 credit or conditional sale or lease agreement or any loan,
                 debt, or other financial obligation of the Lessee shall not be
                 paid at maturity or when due or if the same shall become due
                 prior to its specified maturity by reason of default, or if
                 the Lessee shall fail to meet its obligations under any
                 guarantee or indemnity when properly called upon to do so; or





                                       20
<PAGE>   22
         (v)     if any diligence, distress or execution (other than arrestment
                 to found jurisdiction) shall be issued, levied or sued out
                 upon or against any part of the property of the Lessee and is
                 not discharged within 7 days; or

         (vi)    if the Lessee shall cease or threaten to cease to carry on its
                 business (other than for the purpose of a reconstruction or
                 amalgamation the terms of which have received the previous
                 consent in writing of Simon) or shall transfer or dispose of
                 all or a substantial part of its assets or if all or a
                 substantial part of the assets of the Lessee are appropriated
                 by any governmental authority; or

         (vii)   if the Lessee shall be unable or shall admit in writing its
                 inability to pay its lawful debts as they fall due or shall
                 present a petition to be wound up or shall seek any
                 reorganization or an arrangement with creditors to take
                 advantage of any insolvency law; or

         (viii)  if the Lessee shall do or permit to be done anything which
                 prejudices or jeopardises the rights of Simon or the Owner in
                 or over any of the Goods; or

         (ix)    if the Lessee shall fail to give Simon not less than six
                 weeks' notice in writing of any intended change in the
                 ownership of the issued share capital of the Lessee; or

         (x)     except with the prior written consent of Simon less than the
                 whole, or none, of the legal and beneficial ownership of the
                 issued share capital of the Lessee shall be owned directly or
                 indirectly by Exploration Holdings Limited.

14.03    (a)     Upon Voluntary Termination or upon Simon electing to terminate
                 this Master Agreement (which Simon has the right to do)
                 following receipt by Simon of notice of any intended change in
                 the ownership of the issued share capital of the Lessee or
                 upon acceptance by Simon of any repudiatory breach by the
                 Lessee under this Master Agreement or under any Lease Contract
                 as terminating this Master Agreement and all or any other
                 Lease Contracts entered into pursuant hereto, then Simon shall
                 be entitled to recover on demand a Termination Sum in relation
                 to each Lease Contract so terminated.

         (b)     Without prejudice to the provisions of Clause 5.04 hereof a
                 Termination Sum shall be calculated as at the termination of
                 leasing under any Lease Contract and shall be a sum equal to
                 the aggregate of:

                 (i)      all arrears of Rental and all other amounts accrued
                          due under the terms of this Master Agreement and such
                          Lease Contract;

                 (ii)     all Rentals which would have been payable but for
                          such termination during the unexpired term of the
                          Primary Period, but discounted to





                                       21
<PAGE>   23
                          present day value at the discount rate specified in
                          the Lease Contract to reflect early receipt;

                 (iii)    any costs and expenses incurred by Simon in locating,
                          repossessing or recovering or valuing the Goods or
                          collecting any payments due under this Master
                          Agreement and/or the Lease Contract or otherwise in
                          obtaining the due performance of the obligations of
                          the Lessee under this Master Agreement and each Lease
                          Contract;

                 (iv)     all losses, costs and expenses suffered or incurred
                          by Simon in consequence of such termination in
                          repaying or otherwise redeploying funds borrowed to
                          finance the acquisition of the Goods or in
                          terminating or otherwise redeploying any agreements
                          relating to such borrowing including, without
                          limitation, interest rate or currency swap
                          agreements, foreign exchange contracts or other
                          contracts for differences.  The certificate of the
                          Owner or Simon as to such losses, costs and expenses
                          shall be final and binding on the Lessee in the
                          absence of manifest error in the case of a
                          certificate of the Owner and prima facie evidence of
                          such losses, costs and expenses in the case of a
                          certificate of Simon.

                 (v)      an amount equal to interest on all sums specified in
                          paragraphs (i), (ii), (iii) or (iv) of this
                          sub-clause (b) at the Interest Rate from the date on
                          which such payments become due until the date of
                          payment thereof

                 and in the case of paragraphs (iii), (iv) and (v) of this
                 sub-clause (b) shall include any and all sums payable by Simon
                 to the Owner under any RBS Lease Contract or the RBS Master
                 Leasing Agreement in respect of any losses costs and expenses
                 of a similar nature which Simon is obliged to pay to the Owner
                 thereunder.

                 (c)      If a Lease Contract terminates as a result of an
                          Event of Default Simon may, but shall not be obliged
                          (unless the Termination Sum payable shall have been
                          paid in full and the Ship is to be sold at the same
                          time in accordance with the provisions of Clause 25.3
                          of the Charter) to take such steps as in its sole
                          opinion are reasonable to sell the Goods in the six
                          months following such termination and thereafter may
                          dispose of the same for scrap. Simon shall, provided
                          any Termination Sum due has been paid in full pay to
                          the Lessee an amount equal to 98% of the net sale
                          proceeds of the Goods (if any).

14.04    Upon the termination of the leasing of the Goods under any Lease
         Contract pursuant to Clause 13.04 or Clauses 14.01 or 14.02 the Lessee
         shall cease to be in possession of the Goods with the consent of Simon
         and shall, upon receiving notice of such termination from Simon,
         forthwith cease to use the Goods for any purpose and return





                                       22
<PAGE>   24
         or store the same in accordance with Clauses 13.01 or 13.02, failing
         which the provisions of Clause 13.03 shall apply.  Provided however
         that if at the date of such termination the Goods are part of the Ship
         the provisions of Clause 25.1 of the Charter shall apply.

14.05    If the Lessee is in breach of any of the obligations under this Master
         Agreement or the Lease Contracts and Simon incurs any expenditure in
         respect of the Goods or in obtaining the due performance by the Lessee
         of its obligations under this Master Agreement or the Lease Contract,
         Simon shall be entitled (without prejudice to any other rights it may
         have hereunder) to recover such expenditure from the Lessee together
         with interest thereon at the Interest Rate from the date on which such
         expenditure is incurred to the date of payment thereof to Simon.

15.      INTEREST FOR LATE PAYMENT

15.01    Any payment due under this Master Agreement or due under any Lease
         Contract from the Lessee to Simon, whether by way of rental, damages,
         reimbursement, indemnity or otherwise howsoever, not received for
         cleared money value by Simon on the due date (which shall, in the case
         of a payment by way of reimbursement or indemnity, be deemed to be the
         date on which Simon incurred the expenditure the subject of such
         reimbursement or indemnity) shall bear interest (which shall accrue
         both before and after any decree or judgment) at the rate of 2 per
         cent per annum over The Royal Bank of Scotland plc (or any successor
         thereof) Base Rate for the time being calculated on a day-to-day basis
         ("the Interest Rate") compounded quarterly from the due date.  The
         Lessee shall on demand, pay to Simon the amount of such interest free
         from all deductions or withholdings of whatsoever nature.

16.      VOLUNTARY TERMINATION SALES AGENCY

16.01    Following Voluntary Termination and provided that the Lessee has duly
         performed all the terms and conditions of this Master Agreement and of
         the Lease Contract and provided the Lessee is not in default under any
         other Lease Contract entered into pursuant to this Master Agreement,
         then upon expiry of the Lease Period the Lessee is appointed agent on
         behalf of Simon and shall act as sub-agent of the Owner (unless agreed
         in writing between Simon and the Lessee) to arrange a sale of the
         Goods which are the subject of the Lease Contract in accordance with
         the terms and conditions of this Clause and shall not be obliged to
         return the Goods to Simon pursuant to Clause 13.01 pending sale or
         termination of this agency appointment.

16.02    Any sale of the Goods shall be to a third party which is not dealing
         as a consumer for the purposes of the Unfair Contract Terms Act 1977
         (and is not connected with the Lessee or Simon within the meaning of
         the Income and Corporation Taxes Act 1988 as from time to time amended
         or re-enacted) at an arm's length price to be agreed with Simon before
         the sale is finalised.





                                       23
<PAGE>   25
16.03    Any sale of the Goods shall include terms to the following effect:

         (i)     that all conditions, representations or warranties, expressed
                 or implied by statute or otherwise, whether as to the state or
                 quality of the Goods or as to description, fitness for
                 purpose, merchantable quality or otherwise, are, so far as is
                 permitted by law, expressly excluded as between the owner and
                 the buyer save in respect of the warranty that the Owner shall
                 be passing such title to the Goods as received from the Lessee
                 and Simon free from any Encumbrances created by the Owner; and

         (ii)    that the sale is conditional upon the Owner first recovering
                 possession of the Goods.

         Provided always that nothing in this Clause 16.03 shall prevent the
         Lessee including any other representations and warranties to be given
         directly by the Lessee to a buyer in connection with such sale.

         The Lessee agrees to indemnify and keep indemnified the Owner and
         Simon against any liability, claim, demand, proceeding or expense
         which may result from any claim (whether justified or not) being made
         against the Owner or Simon in respect of or concerning the Goods by a
         purchaser of the Goods or any third party following any sale by the
         Lessee as agent of Simon and sub-agent of the Owner and such indemnity
         shall continue after the determination of this Master Agreement and/or
         Lease Contract for any reason.

16.04    The appointment of the Lessee as agent of Simon and sub-agent of the
         Owner shall determine on the date which is 6 months after the expiry
         of the Lease Period (as that term is defined in the relevant Lease
         Contract).  If the Goods have not been sold within the period of the
         agency then Simon or the Owner will direct the Lessee to deliver the
         Goods to a place specified by the Owner or Simon with all removal,
         transport, necessary insurance and storage costs being payable by the
         Lessee.  The Lessee will ensure that the Goods when so delivered shall
         be complete and in reasonable working conditions (fair wear and tear
         excepted).  If Simon or the Owner has to bear any expenses in carrying
         out the removal and storage of the Goods when remedying any defect in
         them then Simon or the Owner shall be entitled to interest at the
         Interest Rate from the time the Owner incurs such expenses until the
         same are reimbursed to Simon or the Owner (as appropriate) by the
         Lessee.

16.05    In the event of any breach by the Lessee of any of its obligations
         under this Clause or of any Lease Contract current while the agency is
         continuing, then the appointment of the Lessee as agent of Simon and
         sub-agent of the Owner and the authority of the Lessee to act as agent
         of Simon and sub-agent of the Owner may forthwith be terminated by
         notice given by Simon or the Owner to the Lessee.





                                       24
<PAGE>   26
16.06    If the Lessee is successful in arranging a sale of the Goods as
         sub-agent for Simon then the Lessee shall be entitled by way of rebate
         of rentals for acting as sub-agent of Simon to a sum equal to the
         percentage of the net sale proceeds stated in the Lease Contract.  The
         net sale proceeds shall be the gross sale proceeds of the sale less
         any reasonable expenses (excluding all Value Added Tax).  Any
         reasonable expenses incurred by the Lessee in arranging the sale which
         shall be reimbursed out of the gross sale proceeds.  Unless otherwise
         agreed with Simon the Lessee shall arrange that the gross sale
         proceeds are paid to the Owner.

17.      CHARTER SALES AGENCY

17.01    Provided that the Lessee has duly performed all the terms and
         conditions of this Master Agreement and of the Lease Contract and
         provided the Lessee is not in default under any other Lease Contract
         entered into pursuant to this Master Agreement, then upon expiry of
         the Lease Period other than by way of Voluntary Termination the Lessee
         is appointed sub-agent on behalf of Simon (unless agreed in writing
         between the Owner Simon and the Lessee) to arrange a sale of the Goods
         which are the subject of the Lease Contract as part of the Ship in
         accordance with the terms and conditions of Clause 3.6 of the Charter
         and shall not be obliged to return the Goods to Simon pursuant to
         Clause 13.01 pending sale or termination of this agency appointment.

17.02    If the Lessee is successful in arranging a sale of the Goods as
         sub-agent for Simon then the Lessee shall be entitled by way of rebate
         of rentals for acting as agent to a sum equal to the percentage of the
         net sale proceeds stated in the Lease Contract.  The net sale proceeds
         shall be that part of the Net Sale Proceeds which relates to the
         Goods, calculated in accordance with clause 3.5 of the Charter but
         excluding all Value Added Tax, less any reasonable expenses incurred
         by the Lessee in arranging the sale which shall be reimbursed by Simon
         to the extent that Simon receives such payment from the Owner.  Unless
         otherwise agreed with Simon the Lessee shall arrange that the gross
         sale proceeds are paid to the Owner.

17.03    It is confirmed that the Lessee's obligations to insure the Goods and
         all other obligations of the Lessee with respect to the Goods under
         the terms of this Master Agreement and the Lease Contract, including
         the obligation to pay rental, shall continue until the Goods have been
         sold in accordance with the terms of Clause 16 or this Clause 17 or
         redelivered to the Owner.

18.      RIGHTS AND WAIVER

18.01    No right or remedy conferred upon Simon by this Agreement shall be
         exclusive of any remedy provided for herein or by law and all such
         rights and remedies shall be cumulative.





                                       25
<PAGE>   27
18.02    The exercise of any power or remedy or the enforcement of any right
         shall not be construed as a waiver of the right to exercise any other
         power or remedy or to enforce any other right.  Any forbearance or
         indulgence granted by Simon shall not constitute a waiver of the right
         or remedy of Simon in respect of which such forbearance or indulgence
         is granted and Simon shall be entitled to exercise such right or
         remedy at any time thereafter.

19.      NOTICES

19.01    Every notice, request, demand or other communication under this Master
         Agreement shall:

         (a)     be in writing delivered personally or by prepaid first class
                 letter, telex or facsimile transmission (confirmed in the case
                 of a telex or facsimile transmission, by prepaid first class
                 letter sent within 24 hours of despatch but so that the
                 non-receipt of such confirmation shall not affect in any way
                 the validity of the telex or facsimile transmission in
                 question);

         (b)     be deemed to have been received, subject as otherwise provided
                 in this Master Agreement, in the case of a telex, at the time
                 of despatch with confirmed answerback of the addressee
                 appearing at the beginning and end of the communication, in
                 the case of a facsimile transmission, at the time of despatch
                 with confirmation that the communication was well received
                 (provided that, in the case of a telex or facsimile
                 transmission, if the date of dispatch is not a business day in
                 the country of the addressee it shall be deemed to have been
                 received at the opening of business on the next such business
                 day), and in the case of a letter, when delivered personally
                 or five (5) days after being put in the post;

         (c)     be sent:

                 (1)      to Simon to:

                          Simon-Horizon Limited
                          Horizon House
                          Azalea Drive
                          Swanley
                          Kent BR8 8JR

                          Telex: 896050 EXPLOR G
                          Fax: 0322 613650

                          (Attention: Company Secretary)





                                       26
<PAGE>   28
                          with a copy to:

                          Simon Engineering PLC
                          Simon House
                          Bird Hall Lane
                          Stockport
                          Cheshire SK3 ORT

                          Telex: 665923 SIMENG G
                          Fax: 061 491 2472

                          (Attention: Company Secretary)

                 (2)      to the Lessee to:

                          Horizon Exploration Limited
                          6 Pembroke Road
                          Sevenoaks
                          Kent BR8 8JR

                          Telex: 957840 EXPLOR G
                          Fax: 0732 742977

                          (Attention: Company Secretary)

         or to such other address, telex number of facsimile number as is
         notified by one party to the other under this Master Agreement.

20.      GENERAL

20.01    This Master Agreement shall be governed by and construed in accordance
         with English Law and the parties hereby submit to the exclusive
         jurisdiction of the High Court of Justice in England.

20.02    Save as hereinafter provided, neither Simon nor the Lessee may assign
         or otherwise transfer any of its rights or obligations under this
         Master Agreement without the prior written consent of the other party
         hereto PROVIDED ALWAYS that Simon may with the consent of the Owner
         assign or otherwise transfer any or all of its rights under, and the
         benefit of, this Master Agreement without the consent of the Lessee,
         except that Simon shall not without the prior written consent of the
         Lessee (such consent not to be unreasonably withheld or delayed) so
         assign or otherwise transfer any or all of such rights and benefits to
         an assignee who is a Business Competitor of HEL (as such term is
         defined in and for the purposes of the Agreement).  In the event of
         any such assignment or transfer by Simon such assignment or transfer
         shall not impose any





                                       27
<PAGE>   29
         greater liabilities on the Lessee towards Simon than those liabilities
         which the Lessee would have had to Simon at the time of such
         assignment had no such assignment or transfer taken place.

20.03    The Lessee undertakes to provide Simon copies of its audited balance
         sheet and profit and loss account as soon as possible after the ending
         of its financial year or other accounting period and to supply such
         other information about the Goods, their insurance, condition and
         maintenance as Simon may from time to time reasonably require.

         The Lessee shall promptly provide to the Owner following a request by
         Simon or the Owner with financial and other information concerning the
         Lessee and the Guarantors and their respective affairs as the Owner
         (or Simon, in order to comply with its obligations pursuant to the RBS
         Master Leasing Agreement and the RBS Lease Contracts) may from time to
         time reasonably require.

20.04    The Lessee represents and warrants with Simon that it will not by
         entering into or performing its obligations under any Lease Contract
         be in breach of or default under any mortgage or other agreement or
         commitment whatsoever binding on the Lessee.

AS WITNESS the hands of the representatives duly authorised on behalf of the
parties hereto the day and year first written above.


SIGNED BY                               SIGNED BY
         ---------------------------             ------------------------------

SIGNATURE  /s/ [illegible signature]    SIGNATURE  /s/ G.M. Harrison
                                        
DESIGNATION                             DESIGNATION
           -------------------------               ----------------------------
for and on behalf of Simon              for and behalf of the Lessee
in the presence of:                     in the presence of:

WITNESS  /s/ Andrew R. Murray           WITNESS  /s/ Andrew R. Murray

FULL NAME  Andrew R. Murray             FULL NAME                              
                                                 ------------------------------

ADDRESS                                 ADDRESS
       -----------------------------           --------------------------------

- ------------------------------------    ---------------------------------------

- ------------------------------------    ---------------------------------------





                                       28
<PAGE>   30
                                   SCHEDULE 1

                         List of Documents and Evidence

1.       A copy certified by a Director or the Secretary of the relevant person
         to be a true, complete and up-to-date copy, of the Certificate of
         Incorporation and Memorandum and Articles of Association of the Lessee
         and each of the Relevant Parties.

2.       A copy, certified by a Director or the Secretary (or similar officer)
         of the relevant person to be a true copy, and as being in full force
         and effect and not amended or rescinded, of resolutions of the board
         of directors of each of the Lessee and the other Relevant Parties:

         (i)     approving the transactions contemplated by such of the
                 Relevant Documents to which the relevant person is a party;

         (ii)    authorizing a person or persons to sign and deliver on behalf
                 of the relevant person or, as the case may be, authorizing the
                 sealing by the relevant person of the Relevant Documents to
                 which it is a party and any notices or other documents to be
                 given pursuant thereto;

3.       A copy certified by a Director or the Secretary (or similar officer)
         of the relevant person to be a true copy, and as being in full force
         and effect and not revoked or withdrawn, of any power of attorney
         issued by the relevant person pursuant to the said resolutions.

4.       A list, certified as true, complete and up to date by a Director or
         the Secretary (or similar officer) of each of the Relevant Parties of
         its directors and officers.

5.       Evidence that all governmental and other licenses, approvals,
         consents, registrations and filings necessary for any matter or thing
         contemplated by the Relevant Documents and for the legality, validity,
         enforceability, admissibility in evidence and effectiveness thereof
         have been obtained or effected on an unconditional basis and remain in
         full force and effect (or, in the case of effecting of any
         registrations and filings, that arrangements satisfactory to Simon
         have been made for the effecting of the same within any applicable
         time limit).

6.       Evidence that on Delivery, the Ship is and will remain insured in
         accordance with the provisions of the Charter and all requirements of
         the Charter in respect of such insurance have been complied with.

7.       Evidence that on delivery, the Goods will be insured in accordance
         with the provisions of this Master Leasing Agreement and all
         requirements of this Master Leasing Agreement in respect of such
         insurance have been complied with.





                                       29
<PAGE>   31
8.       The agreement duly executed by the Lessee.

9.       The Guarantees duly executed by the Guarantors.

10.      An Assignment Agreement between Simon and the Lessee in respect of the
         Management Agreement.

11.      Such legal opinions as Simon may require in relation to the laws of
         any jurisdiction to which any Relevant Party is or may be subject or
         which may affect the performance of the obligations of any Relevant
         Party.

12.      The Deed of Assignment as so defined in the Agreement.





                                       30

<PAGE>   1
                                                               EXHIBIT 10.10

                     CONTRIBUTION AND ASSUMPTION AGREEMENT


         This Contribution and Assumption Agreement ("Agreement") is entered
into effective as of the 31st day of December, 1996, by and between Seitel
Geophysical, Inc., a Delaware corporation ("SGI"), and Eagle Geophysical, Inc.,
a Delaware corporation ("Eagle").

         WHEREAS, Eagle is a wholly-owned subsidiary of Eagle Horizon, Inc., a
Delaware corporation ("Eagle Horizon");

         WHEREAS,  Eagle Horizon is a wholly-owned subsidiary of EHI Holdings,
Inc., a Delaware corporation ("EHI Holdings");

         WHEREAS,  EHI Holdings is a wholly-owned subsidiary of SGI, so that
Eagle is an indirect wholly-owned subsidiary of SGI;

         WHEREAS, SGI owns certain seismic data acquisition equipment and
related assets;

         WHEREAS, SGI wishes to contribute to Eagle as an additional equity
contribution all of its assets and other rights, subject to the assumption by
Eagle of all of SGI's liabilities and obligations; and

         WHEREAS, in order to effectuate the foregoing, SGI and Eagle now
desire for SGI to contribute all of its assets to Eagle, and for Eagle to
assume from SGI all of its liabilities, all as more particularly described
herein.

         NOW, THEREFORE, for and in consideration of $10.00 and other good and
valuable consideration, the receipt and sufficiency of which is hereby
acknowledged, the parties hereto agree as follows:

         1.      Contribution of Assets by SGI.

                 (a)      SGI hereby sells, conveys, transfers, assigns,
         contributes, and delivers to Eagle all of its right, title, and
         interest in and to all of its assets (the "Assets") other than the
         Excluded Assets (as hereinafter defined).

                 (b)      As used herein, the term "Assets" shall include but
         not be limited to:

                          (i) all right, title and interest of SGI in the
                 seismic data acquisition equipment described on Exhibit "A"
                 attached hereto (the "Equipment");

                          (ii) all right, title and interest of SGI in, to and
                 under all contracts related to the operation, use, rental or
                 other exploitation of the Equipment or otherwise related to
                 the acquisition of seismic data, including but not limited to
                 those agreements and contracts listed on Exhibit "B" attached
                 hereto;
<PAGE>   2
                          (iii) all right, title and interest of SGI in, to and
                 under all contracts related to the acquisition, lease,
                 financing, storage, and maintenance of the Equipment,
                 including but not limited to those agreements and contracts
                 listed on Exhibit "C" attached hereto;

                          (iv) all cash and accounts receivable;

                          (v) all price lists, customers lists, sales promotion
                 and advertising materials, vendor lists, catalogs, research
                 material, technical information, management information
                 systems, software and rights thereto, technology,
                 specifications, designs, drawings and other data, copyrights,
                 trade secrets, know- how, inventions, patents, patent
                 applications, and other intellectual property rights, whether
                 registered or unregistered, owned by SGI and used in the
                 operation of the Assets or otherwise in connection with any
                 Asset;

                          (vi) all right, title and interest of SGI in, to and
                 under all licenses, permits, consents, approvals,
                 authorizations, qualifications, orders and franchises issued
                 by any federal, state, provincial or municipal authority or
                 any other entity relating to the maintenance, use or operation
                 of the Assets; and

                          (vii) all rights, claims or choses in action of SGI
                 arising out of occurrences before or after the date hereof
                 against any person relating to the Assets.

                 (c)      As used herein, the term "Excluded Assets" shall mean
         and be limited to (i) the issued and outstanding shares of stock of
         EHI Holdings, Inc., a wholly-owned subsidiary of SGI, and the rights
         and privileges relating thereto, (ii) all of the issued and
         outstanding shares of stock of African Geophysical, Inc., a Cayman
         Island corporation and a wholly-owned subsidiary of SGI, and (ii) the
         rights of SGI under any agreements relating to the potential
         acquisition of an ocean bottom cable seismic data acquisition system.

         2.      Assumption of Liabilities by Eagle.  Eagle hereby assumes all
of SGI's obligations and liabilities, including but not limited to those
related to the Assets, except for those liabilities and obligations (A) related
to the Excluded Assets, (B) arising under the Guaranty dated as of December 28,
1996 guaranteeing the obligations of Seitel, Inc. under Seitel's $75 Million
Senior Notes, and (C) arising under the Subsidiary Guaranty dated as of July
22, 1996 guaranteeing the obligations of Seitel, Inc. under Seitel's $25
Million Revolving Credit Agreement.  Such assumed liabilities and obligations
shall include, without limitation, the obligations under those agreements
listed on Exhibits "B" and "C" hereto.

         3.      Third-Party Consents.  To the extent that SGI's rights under
any agreement or other Asset that is assigned hereunder may not be assigned
without the consent or approval of another person, including any governmental
approval, which has not been obtained as of the date hereof, this Agreement
shall not constitute an agreement to assign the same if an attempted assignment
would constitute a breach thereof or be unlawful, and SGI shall use its
reasonable efforts to obtain any such required consent or approval as promptly
as possible.  If any such consent or approval shall not be obtained or if any
attempted assignment would be ineffective or impair Eagle's rights to the Asset
in question so that Eagle would not in effect acquire the benefit of all such
rights, SGI, to the maximum extent permitted by law, shall act after the date
hereof




                                      2




<PAGE>   3
as Eagle's agent in order to obtain for Eagle the benefits thereunder, and
shall cooperate to the maximum extent permitted by law, with Eagle in any other
reasonable arrangements designed to provide such benefits to Eagle.  Without
limiting the generality of the foregoing, SGI acknowledges and agrees that its
obligation under this Section is to place Eagle in a position from and after
the effective date hereof to effectively manage the operations of the Assets
and to receive all revenues derived therefrom to the same extent that it would
have received such revenues had Eagle obtained all required consents and
approvals and Eagle had obtained title to all of the Assets as of the effective
date hereof.

         4.      General Provisions.

                 (a)      This Agreement sets forth the entire understanding of
         the parties hereto with resect to the transactions contemplated
         hereby.  It shall not be amended or modified except by written
         instrument duly executed by all of the parties hereto.  Any and all
         previous agreements and understandings between or among any or all of
         the parties regarding the subject matter hereof, whether written or
         oral, are superseded by this Agreement.

                 (b)      This Agreement may only be assigned by a party with
         the prior written consent of the other party hereto.

                 (c)      All of the terms and provisions of this Agreement
         shall be binding upon, inure to the benefit of, and be enforceable by
         the successors and assigns of SGI and Eagle.

                 (d)      A benefit, right or duty provided by this Agreement
         shall be deemed waived only by a writing expressly referring to this
         Agreement that is signed by the party entitled to the benefit thereof.
         The waiver of one instance of any act, omission, condition or
         requirement shall not constitute a continuing waiver unless
         specifically so stated in the aforesaid written waiver.

                 (e)      All communications under this Agreement shall be made
         in writing to the respective addresses first above written, or such
         other addresses as may be designated in writing by notice given
         hereunder.  Such communications shall be deemed to have been duly
         given if either delivered personally or by air courier service, sent
         by facsimile, or mailed by postage prepaid registered or certified
         U.S. mail, return receipt requested.  All communications under this
         Agreement shall be effective upon personal delivery or facsimile
         transmission, or deposit in the U.S. mail or with an air courier
         service.

                 (f)      This Agreement shall be governed by and interpreted
         and enforced in accordance with the laws of the State of Texas,
         without giving effect to any conflicts of law.

                 (g)      Subject to the terms and conditions herein provided,
         each of the parties hereto shall use its best efforts to take, or
         cause to be taken such action, to execute and deliver, or cause to be
         executed and delivered,  such additional documents and instruments,
         and to do, or cause to be done, all things necessary, per or advisable
         under





                                      3
<PAGE>   4
         the provisions of this Agreement and under applicable law to
         consummate and make effective the transactions contemplated by this
         Agreement.

                 (h)      If any one or more of the provisions of this
         Agreement shall for any reason be held by a court of competent
         jurisdiction to be invalid, illegal, or unenforceable in any respect,
         such invalidity, illegality, or unenforceability shall not affect the
         remaining provisions of this Agreement, and this Agreement shall be
         construed as if such invalid, illegal, or unenforceable provision had
         never been a part hereof.

                 (i)      This Agreement may be executed in any number of
         counterparts and any party hereto may execute any such counterpart,
         each of which when executed and delivered shall be deemed to be an
         original and all of which counterparts taken together shall constitute
         but one and the same instrument.


         IN WITNESS WHEREOF, the parties have caused this Agreement to be
executed by their duly authorized officers effective as of the date first
written above.


                    
                                               SEITEL GEOPHYSICAL, INC.
                    
                    
                         
                                               BY: /s/ Jay N. Silverman
                                                  ------------------------------
                                                  Jay N. Silverman
                                                  President
                    
                    
                    
                                               EAGLE GEOPHYSICAL, INC.
                    
                    
                                               BY: /s/ Jay N. Silverman
                                                  ------------------------------
                                                  Jay N. Silverman
                                                  President





                                      4
<PAGE>   5

                                  EXHIBIT "A"

                               LIST OF EQUIPMENT



                                   (attached)
<PAGE>   6

                                  EXHIBIT "B"

                          LIST OF OPERATING AGREEMENTS



1.       Supplemental Agreement between SGI and Southwestern Energy Production
Company dated August 12, 1996.

2.       Supplemental Agreement between SGI and Enron Oil and Gas Company.

3.       Supplemental Agreement between SGI and Couba Operating Company dated
November 18, 1996.

4.       Supplemental Agreement between SGI and Broughton Associates, J.V.
dated May 30, 1996.

5.       Supplemental Agreement between SGI and Aspect Resources Limited
Liability Company dated September 20, 1995.

6.       Supplemental Agreement between SGI and TEPCO, INC. dated March 28,
1996.

7.       Supplemental Agreement between SGI and Hunt Oil Company dated July 23,
1996.

8.       Geophysical Data Acquisition Contract between SGI and Fina Oil and
Chemical Company dated March 25, 1996.

9.       Supplemental Agreement between SGI and Forman Petroleum Corporation
dated July 17, 1996.

10.      Supplement No. 2 between SGI and Burlington Resources (formerly
Meridian Oil Inc.) dated November 1, 1995.

11.      All Master Agreements, including but not limited to the Master
Agreements relating to the above-listed supplements.

12.      Operating Leases between SGI and Horizon Exploration Limited and/or
Horizon Seismic, Inc.
<PAGE>   7

                                  EXHIBIT "C"

                    LIST OF ACQUISITION/FINANCING AGREEMENTS



1.       Equipment Purchase Agreement between SGI and Opseis Inc. dated January
5, 1994.

2.       Equipment Purchase Agreement between SGI and Sercel Incorporated dated
September 30, 1996.

3.       Equipment Purchase Agreements between SGI and Geospace Corporation
dated October 3, 1996.

4.       Term Credit and Security Agreement between SGI and Compass Bank dated
July 1993, as modified and amended, and Term Note in the original amount of
$4,300,000, and all Addenda, Schedules, and Amendments thereto.

5.       Master Lease Agreement between SGI and McCullagh Leasing, a unit of GE
Capital Fleet Services, dated February 22, 1994 and Addenda, Schedules and
Amendments thereto.

6.       Master Equipment Lease between SGI and MetLife Capital, Limited
Partnership, dated May 20, 1994 and Addenda, Schedules and Amendments thereto.

7.       Loan and Security Agreement between SGI and MetLife Capital
Corporation dated February 22, 1996, Supplemental Security Agreement No. One
between SGI and MetLife Capital Corporation dated February 22, 1996, and
Promissory Note in the original amount of $433,000 payable to MetLife Capital
Corporation, and all Addenda, Schedules, and Amendments thereto.

8.       Loan and Security Agreement between SGI and  NationsBanc Leasing
         Corporation of North Carolina dated as of July

9, 1996, Secured Term Note A in the original amount of $5,902,372, and Secured
Term Note B in the original amount of $1,361,839.13, and all Addenda,
Schedules, and Amendments thereto.

<PAGE>   1

                                                                         10.11.1

                              DATED 11th JULY 1994





                                J. MARR LIMITED

                                    - and -

                          HORIZON EXPLORATION LIMITED





                      AGREEMENT to extend the Charterparty

                              of "PACIFIC HORIZON"





                                                  HILL DICKINSON DAVIS CAMPBELL 
                                                      PEARL ASSURANCE HOUSE 
                                                           DERBY SQUARE 
                                                         LIVERPOOL L2 9XL
<PAGE>   2
THIS AGREEMENT is made the 11th day of July 1994 BETWEEN: J. MARR LIMITED
(registered number 73874 of St. Andrews Dock, Hull HU3 4PN ("the Owners") of
the one part and HORIZON EXPLORATION LIMITED (registered number 2804983) of 6,
Pembroke Road, Sevenoaks, Kent ("Horizon")

WHEREAS:

(1)      By a charterparty dated 4th February 1981, ("the Charterparty") the
         Owners let by way of charter to Horizon (formerly Simon-Horizon
         Limited whose name at the time of entering into the Charterparty was
         Horizon Exploration Limited (registered number 467924) the motor
         vessel "PACIFIC HORIZON" formerly known as "SUB-SEA 1" (hereinafter
         called "the Vessel") as more fully described in the Charterparty

(2)      The Charterparty was due to expire on 30th June 1993 and the parties
         have now agreed to extend the term of such charter for a period of ten
         years from 1st July 1993 (subject to termination by either party
         giving to the other one month's notice) in the terms following

IT IS HEREBY AGREED as follows:

1.       CLAUSE 3 of the Charterparty shall be amended to read:

                 "Owners agree to continue to let and the Charterers agree to
                 continue to hire the Vessel for the purpose of all lawful
                 activities associated with off-shore geophysical survey
                 operations as Charterers shall direct for a period of ten
                 years from 1st July 1993 unless during such period one party
                 gives to the other at least one month's notice of its desire
                 to determine the Charterparty whereupon such Charterparty
                 shall cease on expiry of such notice and the Vessel shall be
                 re-delivered in accordance with clause 36 of the Charterparty.
                 Charterers shall not send the Vessel beyond the limits of the
                 Limited European Trading Area as defined in the second
                 schedule to the Merchant Shipping (Certification of Marine
                 Engineer Officers and Licensing of Marine Engineer Operators)
                 Regulations 1986 without Owners' consent but such consent
                 shall not be unreasonably withheld provided Charterers agree
                 to the rate of hire being increased from the date the vessel
                 leaves such area to take account the anticipated increased
                 operational costs consequent upon the Vessel trading outside
                 such area.  The Vessel shall be loaded and unloaded safely
                 afloat in any dock or at any wharf or place or anchorage
                 within such area (or outside such area with Owners' consent)





                                       2
<PAGE>   3
                 according to the custom of the port or place as the Charterers
                 may direct"

         The proviso shall be the same as in the clause 3 in Charterparty

2.       CLAUSE 4 of the Charterparty shall be deleted and the remaining
         clauses re-numbered accordingly

3.       CLAUSE 5 shall be amended so as to substitute 1st July 1993 for 8th
         May 1981

4.       CLAUSE 6 shall be amended so as to read:

         (a)     "Charterers shall pay for the use and hire of the vessel at
                 the rate of L.2250 per day commencing at and from her delivery
                 as aforesaid and continuing until the date of her re-delivery
                 to Owners after completion of refurbishment as provided in
                 clause 18 (as re-numbered in accordance with clause 2 hereof)
                 except as mentioned in sub-clauses (b) and (c) hereof

         (b)     On each subsequent 1st July should there be any increase in
                 the United Kingdom Retail Prices Index ("RPI") published by
                 H.M. Stationery Office or any official Publication substituted
                 for it over that existing on the 1st July in the previous year
                 then for the next ensuing 12 months period until the next
                 following 30th June the rate per day specified in sub clause
                 (a) hereof shall be increased by the same percentage increase
                 in the RPI.  Should there be no such increase in the RPI at
                 the relevant 3Oth June then the rate per day then prevailing
                 shall continue for the ensuing 12 month period

         (c)     In addition to any such increase as is described in sub-clause
                 (b) hereof on each subsequent 1st July should there be any
                 increase in insurance premium and/or mutual club call then
                 such increase shall be added pro rata to the rate per day
                 described in sub clause (a) as increased from time to time in
                 accordance with sub clause (b) for the ensuing 12 month
                 period.  Such increase in premium and/or mutual club call
                 shall be added pro rata to the said rate per day even if there
                 is no increase under the terms of sub clause (b) hereof".

5.       CLAUSE 16 shall be deleted and substituted by the words:

                 "Charterers shall not assign the benefit of this charter or
                 sub-let the Vessel without the written consent of, and in
                 terms and conditions acceptable to, the Owners and the owners
                 of the vessel"





                                       3
<PAGE>   4
6.       CLAUSE 25 shall be deleted and substituted by the words:

                 "If the Vessel shall be required by charterers to be laid up
                 in Hull the rate of hire shall be reduced by L.1000 per day
                 when such layup exceeds 30 continuous days.  Such reduced rate
                 shall apply only upon the expiry of 7 days prior written
                 notice received from charterers who shall be obligated to give
                 7 days prior written notice of remobilisation when such layup
                 is to terminate"

7.       ALL remaining clauses of the Charterparty shall stand unless impliedly
         amended by the above


SIGNED by                       )
                                )       /s/ [illegible signature]
for and on behalf of:           )
the Owners                      )
                        
                        
SIGNED by                       )
                                )       /s/ George Purdie (George Purdie)      
for and on behalf of:           )
the Charterers                  )
                        




                                       4

<PAGE>   1
                                                                         10.11.2





                               DATED 11 JULY 1994



                             SIMON-HORIZON LIMITED

                                    - and -

                                J. MARR LIMITED

                                    - and -

                          HORIZON EXPLORATION LIMITED





                                DEED OF NOVATION


                             m.v. "PACIFIC HORIZON"





                                                   HILL DICKINSON DAVIS CAMPBELL
                                                             LIVERPOOL
                                                              REF:JGW
<PAGE>   2
THIS DEED OF NOVATION made the 11th day of July 1994

BETWEEN:

(1)      SIMON-HORIZON LIMITED (registered number 467924) of Horizon House,
         Azalea Drive, Swanley, Kent, BR8 8JR ("Simon")

(2)      J. MARR LIMITED (registered number 73874) of St. Andrews Dock, Hull,
         HU3 4PN ("the Owners") and

(3)      HORIZON EXPLORATION LIMITED (registered number 2804983) of 6, Pembroke
         Road, Sevenoaks, Kent ("Horizon")

WITNESSES as follows:

1.       SIMON (formerly Horizon Exploration Limited registered number 467924)
         and the Owners (formerly J. Marr & Son Limited registered number
         73874) are parties to a charterparty dated 4th February 1993 as
         amended by an agreement dated 30th March 1988 and by a supplemental
         agreement dated 6th July 1990 ("the Charterparty") for the charter of
         motor vessel "PACIFIC HORIZON" formerly known as the "SUBSEA 1"
         (hereinafter called "the Vessel") as more fully described in the
         Charterparty

2.       SIMON wishes to transfer its rights and obligations under the
         Charterparty to Horizon effective from 1st July 1993 and the Owners
         have consented to such novation

3.       HORIZON shall from 1st July 1993 be substituted for Simon under the
         Charterparty as if Horizon had originally been a party to the
         Charterparty instead of Simon.  Horizon shall be bound by the
         Charterparty as it relates to Simon and shall enjoy all rights and
         benefits conferred on Simon under the Charterparty

4.       THE Owners represent and warrant that they are the registered
         disponent owners of the Vessel that the charter is valid and
         enforceable and now in full force and that the owners of the Vessel
         have consented to this novation

5.       THE Owners release Simon from its obligations under the Charterparty
         and all claims, actions, demands, proceedings and liability which it
         may have or claim to have or but for this release might have had
         against Simon connected with the Charterparty in respect of any
         matter, act or omission of Simon from 1st July 1993 subject to hire
         having been paid by Simon to the Owners and all other obligations on
         the part of Simon having been complied with up to and including the
         date hereof

6.       HORIZON shall indemnify Simon against each claim, action, proceeding,
         judgment, damage, loss, expense or liability





                                       2
<PAGE>   3
         incurred or suffered by or brought or made or recovered against Simon
         by the Owners or any other person connected with the Charterparty in
         respect of any matter, act or omission of Simon after 30th June 1993

7.       HORIZON covenants with the Owners that Horizon will duly observe and
         perform all the conditions and obligations imposed upon it by the
         Charterparty

8.       THE provisions of clause 35 of the Charterparty shall apply to this
         deed

IN WITNESS whereof the parties hereto have hereunto executed and delivered this
document as a deed

EXECUTED as a deed by     )

SIMON-HORIZON LIMITED     )

acting by:                )


director         J.W. Greener              /s/ J.W. Greener

secretary        C.J. Matthews             /s/ C.J. Matthews


EXECUTED as a deed by     )

J. MARR LIMITED           )

acting by:                )


director                  /s/ [illegible signature]

director/secretary        /s/ [illegible signature]


EXECUTED as a deed by     )

HORIZON EXPLORATION       )

LIMITED                   )

acting by:                )


director         /s/ George Purdie  (George Purdie)

director         /s/ G.M. Harrison





                                       3

<PAGE>   1
                                                                         10.11.3

Item 30  Operations





                               PACIFIC HORIZON -


                                    CHARTER
<PAGE>   2
January, 1981.





IT IS THIS DAY AGREED between J. MARR AND SON LIMITED of St. Andrews Dock Hull
HU3 4PN (hereinafter called "Owners") being disponent owners of the good motor
vessel called "Subsea 1" (hereinafter called "the Vessel") described as per
clause 1 hereof and HORIZON EXPLORATION LIMITED of Horizon House, Azalea Drive,
Swanley, Kent BR8 8JR (hereinafter called "Charterers")

1.       DESCRIPTION AND PERFORMANCE OF VESSEL:

Owners guarantee that at the date of delivery of the Vessel under this charter

(a)      She shall be classed with Lloyds Class 100 + A1.

(b)      She shall be in every way fitted for burning diesel oil in main
         motors.

(c)      She shall be of the description set out in appendix "A" attached
         hereto and signed by Owners and Owners undertake to use their best
         endeavours so to maintain the Vessel during the period of her service
         hereunder.  In the event of any conflict between the particulars set
         out in the aforesaid appendix "A" and any provision of this charter
         such latter provision shall prevail

2.       CONDITION OF VESSEL:

Owners shall, before and at the date of delivery of the Vessel under this
charter, exercise due diligence to make the Vessel in every way fit for service
in accordance with clause 3 hereof in all weather working conditions with her
machinery equipment and hull in such a state as to obtain the most economic
working and with a full and efficient complement of master officers and crew.
Owners undertake that throughout the period of service under this charter they
will, whenever the passage of time, wear and tear or any event requires steps
to be taken to maintain the Vessel as stipulated in clause 1 hereof and in this
clause or to restore the Vessel to such condition, exercise due diligence to
maintain or restore the Vessel as aforesaid

3.       PERIOD, PURPOSE AND TRADING LIMITS:

Owners agree to let and the Charterers agree to hire the Vessel for a period of
7 years commencing from the date of delivery of the Vessel, for the purpose of
all lawful activities associated with offshore geophysical survey operations as
Charterers shall direct.





                                     - 2 -
<PAGE>   3
Charterers shall not send the Vessel beyond the limits of the Near Continental
Trading Area as defined in the Second Schedule to the Merchant Shipping
(Certification of Marine Engineer Officers) Regulations 1971 and 1980 without
Owners' consent but such consent shall not be unreasonably withheld provided
Charterers agree to the rate of hire being increased from the date the Vessel
leaves such area to take account of the anticipated increased operational costs
consequent upon the Vessel trading outside such area.  The Vessel shall be
loaded and unloaded safely afloat in any dock or at any wharf or place or
anchorage within such area (or outside such area with Owners' consent)
according to the custom of the port or place as Charterers may direct.

PROVIDED THAT

(a)      The Vessel shall not be ordered to nor bound to enter without Owners'
         written permission

         (i)     Any place where fever or epidemics are prevalent or to which
                 the master officers and crew by law are not bound to follow
                 the Vessel

         (ii)    Any ice-bound place or any place where lightships marks and
                 buoys are or are likely to be withdrawn by reason of ice on
                 the Vessel's arrival or where there is risk that ordinarily
                 the Vessel will not be able on account of ice to reach the
                 place or to get out after having completed her operations.
                 The Vessel shall not be obliged to force ice nor to follow
                 icebreaker.  If, on account of ice, the master considers it
                 dangerous to remain at the loading or discharging place for
                 fear of the Vessel being frozen in and/or damaged, he has
                 liberty to sail to a convenient open place and await
                 Charterers' fresh instructions.

(b)      The Charterer shall not employ the Vessel or suffer her employment in
         any trade or business which is forbidden by international law or is
         otherwise illicit or in carrying illicit or prohibited goods or in any
         manner whatsoever which may render her liable to condemnation in a
         prize court or to destruction seizure confiscation and in event of
         hostilities in any part of the world (whether war be declared or not)
         shall not employ the Vessel or suffer her employment in carrying any
         contraband goods and shall not permit or suffer the Vessel to enter or
         trade to any zone which is declared a war zone by the Vessel's War
         Risks insurers unless there shall have been effected by the Charterer
         and at its expense such special insurance coverage as matters may
         require. 

(c)      The Charterer shall not do or suffer to be done anything whereby the
         registration of the Vessel as a British ship at a port of registry in
         the United Kingdom may be forfeited or imperilled.





                                     - 3 -
<PAGE>   4
(d)      The Charterers shall not use the Vessel in any manner or for any
         purpose excepted from any insurance policy or policies effected on the
         Vessel from time to time or for the purpose of the carriage of goods
         of any description excepted from the said insurance policy or policies
         and shall not do or suffer to be done anything which would reasonably
         be expected to invalidate any of the said insurance policy or policies
         nor shall the Charterer do any act or voluntarily permit or suffer any
         act to be done whereby:  any insurance required hereunder shall or may
         be suspended impaired or become defective

4.       EXTENSION TO CHARTER:

Charterers have the option of extending the period of this charter for a
further three consecutive periods of 12 months.  Charterers will be required to
declare by written notice to Owners an intention to extend the charter by each
extension six months in advance, but for the period of any such extension the
rate of hire will be calculated in accordance with clause 6 hereof.

5.       DELIVERY:

The Vessel shall be delivered to Charterers at Hull on or about 8th May 1981
and re-delivered to Owners at a safe U.K.  port or any other place agreed upon
between the parties.  The Vessel shall be delivered to Charterers upon
successful completion of Owners' sea trial.  Full charter rate is to apply from
the date of delivery.

6.       RATE OF HIRE:

(a)      Subject as herein provided Charterers shall pay for the use and hire
         of the Vessel at the rate of L.2,100 per day commencing at and from
         the date of her delivery, as aforesaid and continuing until the date
         of her re-delivery to Owners after completion of refurbishment as
         provided in clause 18.

(b)      During the Primary Period of the bareboat charter referred to below
         the rate in this clause is based on (i) L.980 being operating costs
         per day relating to master, officers and crew, hire and maintenance of
         electronics, insurance, stores, management, repatriation and hull and
         machinery repairs and (ii) L.1,120 depreciation and interest per day
         in respect of the Vessel.  On 1st April 1982 and each 1st April
         thereafter for the duration of the Charter the rate of hire shall be
         increased by the amount of increase, if any, of either the said
         operating costs and/or the rate of hire payable during the immediately
         previous 12 months under the bareboat charter to the Owners the
         relevant terms of which have been produced to Charterers.  During the
         Secondary Period of the said bareboat charter a sum equal to 75% of
         the reduction in the bareboat charter rate of hire will be deducted
         from the said figure of L.1,120 or such other figure which may be
         applying at





                                     - 4 -
<PAGE>   5
         the end of such Primary Period representing depreciation and interest
         during the said Primary Period in order to determine the figure
         representing depreciation and interest during the period of any
         extension of the charter as provided under clause 4 hereof.

(c)      The rate of hire in this clause is based, inter alia, on the
         employment of ex fishermen to man the Vessel.  If at any time during
         the charter Owners are required by the government and/or by union
         pressure or for any other reason whatsoever to engage as master and/or
         officers and/or crew members of the Merchant Navy Officers Association
         and/or the National Union of Seamen then any extra cost to Owners as a
         result thereof in addition to any increase payable under (b) hereof
         shall be borne by Charterers for the remaining part of this charter
         and shall be added to the charter hire

7.       PAYMENT OF HIRE:

Payment of hire shall be made in cash in pounds sterling without discount
monthly in advance on the 1st day of each month at Williams & Glyn's Bank
Limited, Silver Street, Hull less any advances for disbursements made on
Owners' behalf.  In default of payment, Owners have the right of withdrawing
the Vessel from the service of Charterers without noting any protest and
without interference by any court or any other formality whatsoever and without
prejudice to any claim Owners may otherwise have on Charterers under this
charter.  Failure to or delay in exercising such right shall not amount to a
waiver of such right

8.       BUNKERS AT DELIVERY AND RE-DELIVERY:

Charterers shall accept and pay for all bunkers lubricants greases and oils on
board at the time of delivery and Owners shall on expiry of this charter pay
for all bunkers and oils then remaining on board at the prices listed at the
respective ports of delivery and re-delivery at the time of such delivery or
redelivery

9.       CHARTERERS' PERSONNEL:

Charterers may send upon any voyage made under this charter their own personnel
or those of their associated companies sub-contractors or clients in the
Vessel's available accommodation up to a number not exceeding that stated in
the Vessel's current Department of Trade Life Saving Appliance Certificate
(including the Vessel's complement of master officers and crew), Owners finding
provisions (except liquors).  The cost of provisions for each month shall be
calculated at the end of the month and an average daily rate of such cost shall
then be calculated.   Charterers shall pay to Owners by the end of the
following month their share of such daily rate which share shall be the ratio
that the average daily number of personnel on board serving for them or





                                     - 5 -
<PAGE>   6
on their behalf during that month bears to the average daily total number of
personnel on board during that month serving both Owners and Charterers or on
their behalf.

10.      LIEN:

Owners shall have a lien upon all goods and equipment owned by the Charterers
or their associated companies and installed on board the Vessel or being
carried in the Vessel for any amounts due under this charter and Charterers
shall have a lien on the Vessel for all monies paid in advance and not earned
and for all claims for damages arising from any breach of this charter by
Owners.

11.      OWNERS TO PROVIDE:

Owners undertake to provide and to pay for insurance of their liabilities as
provided under clauses 29 and 31 hereof and for all provisions wages and all
other expenses of the master officers and crew; also for all deck cabin and
ships engine room and propulsion motor room stores.  Owners' obligation under
this clause extends to cover all liability for customs or import duties arising
at any time during the performance of this charter in relation to the personal
effects of the master officers and crew and in relation to the stores
provisions and other matters aforesaid which Owners are to provide and/or pay
for and Owners shall refund to Charterers any sum they or their agents may have
paid or been compelled to pay in respect of such liability.  Any amounts
allowable in general average for wages and provisions and stores shall be
credited to Charterers insofar as such amounts are in respect of a period when
the Vessel is on hire

12.      CHARTERERS TO PROVIDE:

Charterers shall provide and pay for insurance of their liabilities as provided
under clause 31 hereof and for all pilotage and boatmen whether compulsory or
not fuel lubricants greases fresh water for boilers port charges light dues tug
assistance mooring lines at rig site or offshore installation or other place
agency fees port charges expenses of loading and unloading Charterers' stores
and equipment canal dues and steersmen dock dues all dock harbour and tonnage
dues at the port of delivery and redelivery agencies commission and all charges
other than those payable by Owners in accordance with clause 11 hereof provided
that all charges for the said items shall be paid by Owners when incurred for
Owners' purposes whether the Vessel is on hire or off hire.  The foregoing
provision as to fuel shall not apply to any fuel used in connection with
general average sacrifice or expenditure or with the preparation for the dry
docking or repair of the Vessel and whilst the Vessel is in dry dock or under
repair.  Fuel consumed under those circumstances shall be paid for by Owners.
PROVIDED that if Charterers use Owners' agency or facilities for obtaining fuel
for their own account and such is debited to Owners' account then





                                     - 6 -
<PAGE>   7
Charterers shall pay Owners for such fuel with the next payment of hire due
after invoice has been rendered to Charterers by Owners

13.      SPACE AVAILABLE TO CHARTERERS:

The whole reach and burthen of the Vessel's upper and main decks abaft the aft
bulkhead of the accommodation shall be at Charterers' disposal reserving for
Owners only the engineer's store and workshop, lamp room and safety equipment
store on the main deck and a small section of the starboard lower store for the
storage of paint.  Additionally there shall be made available at all times to
Charterers on the upper and main decks in the accommodation all those cabins or
spaces described in the drawing No. RW/0006 of the Vessel dated October 1980 as
being for ratings, cadets, senior seismic, canteen, secondary navigation
control room lounge and officers' mess together with client's suite, party
chief's suite and senior seismic single berth on the forecastle deck

14.      DUTIES OF MASTER AND CREW:

The master shall carry out his duties with the utmost despatch during the day
and night as required by Charterers and shall render all customary assistance
with the Vessel's crew and equipment.  The Master shall be under the orders of
the Charterers as regards employment agency and other arrangements.  The
Charterers shall furnish the master with all instructions and sailing
directions and the master and engineer shall keep full and correct logs
accessible to the Charterers and their agents.  Notwithstanding anything
contained in this clause the Master may refuse to comply with any order of the
Charterers if in his opinion the safety of the Vessel is likely to be
endangered whereupon notice in writing shall be given to Charterers and/or
their agents to that effect.  Owners undertake that the Vessel's crew:

(a)      Will connect and disconnect fuel and water in port or any other
         installations;

(b)      Will assist when necessary in operations associated with the
         employment of the Vessel in surveying operations

15.      CONDUCT OF VESSEL'S PERSONNEL:

If Charterers shall complain of the conduct of the master or of any of the
officers or if Owners shall complain of the conduct of the Charterers'
personnel or of personnel invited aboard the Vessel by Charterers Owners and
Charterers shall jointly and immediately investigate the complaint and if the
complaint proves to be well founded shall take such action as is necessary and
practicable





                                     - 7 -
<PAGE>   8
16.      SUB-LET AND ASSIGNMENT:

Charterers shall not assign the benefit of this charter or sub-let the Vessel
except to a company within the Horizon group of companies and in such event the
assignment or sub-letting shall be on terms and conditions acceptable to Owners
and the owners of the Vessel.  It is hereby acknowledged by Charterers that
Owners may assign the benefit of this charter to Ship Mortgage Finance Company
Limited the present owners of the Vessel.

17.      DANGEROUS GOODS:

Subject to the provisions of clause 3 hereof Charterers shall at the discretion
of the master have the liberty of carrying explosive and dangerous commodities
provided such are packed and stowed in accordance with all relevant regulations
of the country of the Vessel's flag and any other permitted regulation and/or
IMCO Dangerous Goods Code.  Any additional expenses incurred in complying with
such regulations shall be for Charterers' Account

18.      CHARTERERS' EQUIPMENT:

Charterers shall have the right to install equipment on board the Vessel with
the written consent of Owners which consent shall not be unreasonably withheld
provided Owners have first obtained consent from the owners of the Vessel and
provided always that the installation of the equipment complies with the
requirements of the Vessel's classification Society and the regulating
authority of the Vessel's flag.  The equipment shall be carried at the risk of
the Charterers.  The Owners shall in no way be responsible for any consequences
arising from or in connection with the equipment and Charterers to indemnify
Owners against all consequences and liabilities arising therefrom.  The cost of
installation survey operation maintenance and removal of the equipment together
with the refurbishing of the Vessel to original condition after removal of
equipment shall be to Charterers' account.  Provided that no removal and
refurbishing shall take place in the event of a terminating event as specified
in clause 19 (v) and (xii) of the bareboat charterparty between the owners of
the Vessel and the Owners.  In such event there shall be effected a sale by the
owners of the Vessel together with the equipment as agreed between the owners
of the Vessel and the parties hereto.  Refurbishing of the Vessel shall include
all work required to make seaworthy and restore the Vessel after removal of
equipment including restoring the Vessel to its classification if required but
shall not include the removal of basic structural strengthening and alterations
built into the Vessel during initial conversion to accommodate Charterers'
equipment





                                     - 8 -
<PAGE>   9
19. SALVAGE:

All salvage and all proceeds from derelicts shall be divided equally between
Owners and Charterers after deducting the master's officers' and crews' share
hire of Vessel for time lost and cost of fuel consumed and all other damage
costs and expenses incurred.  Subject as aforesaid and subject to the
provisions of clauses 21 and 22 hereof all loss of time and all expenses paid
excluding any damage to or loss of the Vessel incurred in saving or attempting
to save life and in unsuccessful attempts to salve shall be borne equally by
Owners and an attempt to undertake salvage shall be made by the Vessel unless
such has been mutually agreed between the parties or unless there is a legal
obligation upon the master or Owners to carry out salvage.

20.      MAINTENANCE AND REPAIRS:

Notwithstanding the provisions of clauses 21 and 22 hereof Charterers shall
allow Owners up to 20 days in each year cumulative during the period of the
charter on hire for necessary maintenance and/or overhaul and/or repairs
including dry docking in connection with Owners' duties under Clause 2 hereof
such days to be taken at the discretion and decision of the Owners who will as
far as possible take into account the exigencies of the service when making
such decision.  Any accumulated time for dry docking maintenance and repairs
saved but not used shall be payable by Charterers annually and any balance upon
re-delivery at the then prevailing daily hire.

21.      SUSPENSION OF HIRE:

(A)      If as a result of any deficiency of crew or Owners' stores, strike of
         master, officers and crew, breakdown of machinery, damage to hull or
         other accident, the Vessel is prevented from working for a period of
         time more than 12 hours per week no hire shall be payable from the
         commencement of such loss of time until the Vessel is again ready and
         in an efficient state to resume her service from a position not less
         favourable to Charterers than that at which such loss of time
         commenced; and any hire paid in advance shall be adjusted accordingly.
         If such loss of time shall not exceed the said period of 12 hours full
         hire shall be paid by Charterers Provided always however that hire
         shall not cease in the event of the Vessel being prevented from
         working as aforesaid as a result of:

         (i)     The carriage of dangerous goods.

         (ii)    Quarantine or risk of quarantine unless caused by the master,
                 officers or crew having communication with the shore at any
                 infected area not in connection with the employment of the
                 Vessel and without consent or the instructions of Charterers.





                                     - 9 -
<PAGE>   10
         (iii)   Deviation from her charter duties or exposure to abnormal
                 risks at the request of Charterers.

         (vi)    Working alongside or in the proximity of any off-shore unit
                 provided that there has been no gross dereliction of duty on
                 the part of the master, officers or crew of the Vessel.

         (v)     Detention in consequence of being driven into port or to
                 anchorage through stress of weather or trading to shallow
                 harbours or to rivers or ports with bars when the expenses
                 resulting from such detention shall be for Charterers' account
                 howsoever incurred.

         (vi)    Any act or omission of the Charterers their servants or
                 agents.

         (vii)   Detention or damage by ice.

(B)      Owners shall be under no liability whatsoever to Charterers for any
         loss damage or delay sustained by Charterers as a result of the Vessel
         being prevented from working by any cause whatsoever other than
         Owners' failure to comply with their obligation to make the Vessel
         seaworthy and fit for her duties in accordance with this charter when
         such liability shall be limited as provided under clauses 31 and 32.

(C)      The Vessel shall be dry docked at regular intervals to be mutually
         agreed and fuel consumed during the dry docking period and dry dock
         costs to be for Owners' account.  Charterers shall place the Vessel at
         Owners' disposal clear of Charterers' moveable or detachable equipment
         (if required by  Owners) at the nearest port suitable for the purpose.
         The Vessel shall be off-hire unless the full time allowed in clause 20
         is not used from the time of arrival at the dry docking port when
         clear of such equipment and shall remain off-hire until ready to
         resume Charterers' service at the place at which the off-hire period
         commenced.

22.      DEVIATION:

Further and without prejudice to the provisions of clause 21 in the event of
the Vessel deviating (which expression includes putting back putting into any
port other than that to which she is bound under the instructions of
Charterers) for any cause or for any purpose previously mentioned in clause 21
no hire shall be payable as from the commencement of such deviation until the
time when the Vessel is again ready and in an efficient state to resume her
service from a position not less favourable to Charterers than that at which
the deviation commenced unless such deviation in the opinion of the master was
necessary in the interests of the





                                     - 10 -
<PAGE>   11
Charterers or the safety of the Vessel and unless the loss of time in
consequence thereof shall exceed 12 hours.  In the event of the Vessel for any
cause or for any purpose previously mentioned in clause 21 putting into any
port other than the port to which she is bound on the instructions of
Charterers the port charges and other expenses at such port shall be borne by
Owners.  Should the Vessel be driven into port or any anchorage by stress of
weather hire shall continue to be due and payable during any loss of time
caused thereby

23.      LOSS OF VESSEL:

Should the Vessel be lost hire shall cease at noon on the day of her loss and
should the Vessel be missing hire shall cease at noon on the day on which she
was last heard of and any hire in advance and not earned shall be returned to
Charterers

24.      INFECTED AREA AND INFRACTION OF LOCAL LAWS:

Owners shall be liable for any delay in quarantine arising from the Owners,
master officers or crew having communication with the shore at any infected
area without the written consent or instructions of Charterers or their agents
also for any loss of time through detention by customs or other authorities
caused by smuggling or other infraction of local law on the part of the master
officers or crew

25.      LAYING UP:

Charterers shall have the option of laying up the Vessel in which case the hire
provided for under this charter shall be reduced by the amount by which Owners
can reasonably reduce the expenditure otherwise falling upon them under this
Charter subject however to a minimum of 30 days being required for laying up
the Vessel otherwise full hire will be required by Owners

26.      REQUISITION:

Should the Vessel be requisitioned by any government during the period of this
charter the Vessel shall be deemed to be off-hire during the period of such
requisition and any hire paid by the said government in respect of such
requisition period shall be for Owners' account.  The period during which the
Vessel is on requisition to the said government shall count as part of the
period provided for in clause 3 of this charter.  Negotiations with the
requisitioning government to secure hire or compensation for the Vessel and/or
the Charterers' equipment shall be conducted after agreement between the
parties by either party or jointly.  In the event of the charter period
terminating within the period of requisition Charterers shall fulfil their
obligations under the terms of clauses 3, 5, 8 and 36 upon the Vessel being
released from requisition the cost of the re-delivery voyage shall be that cost





                                     - 11 -
<PAGE>   12
including steaming from the port or place of initial requisition or that port
or place of release from requisition whichever is the lesser.

27.      OUT BREAK OF WAR:

In the event of war or hostilities preventing the operation of this Vessel in a
particular area of the world where Charterers require it to be operated
Charterers shall not have the right of cancelling this charter but shall order
the Vessel to a part of the world free of such war or hostilities

28.      WAR RISK:

(a)      The Vessel (unless the consent of the Owners be first obtained)

         (i)     shall not be bound to proceed to any place on any voyage and
                 shall not be used on any service which will bring her within a
                 zone which is known to be dangerous as a result of any actual
                 or threatened act of war, war, hostilities, war like
                 operations revolutions civil war civil commotion or the
                 operation of international law or of any acts of piracy or of
                 hostility or malicious damage against this or any other Vessel
                 or its cargo by any person party or state whatsoever

         (ii)    shall not be exposed in any way to any risks in respect of
                 penalties or otherwise howsoever consequent upon the
                 impositions of sanctions by any government or governments and

         (iii)   shall not carry any goods or equipment that may in any way
                 expose her to any risks of seizure capture penalties or any
                 other interference of any kind whatsoever by any belligerent
                 or fighting power or party or by any "de jure" or "de facto"
                 government or ruler

(b)      The Vessel shall have liberty to comply with any orders or direction
         as to departure arrival routes ports of call stoppages destinations
         delivery or in any other wise whatsoever given by the government of
         the nation under whose flag the Vessel sails or any other government
         or by any other person (or body) acting or purporting to act with the
         authority of any such government or by any committee or person having
         under the terms of the war risks insurance on the Vessel the right to
         give any such orders or directions





                                     - 12 -
<PAGE>   13
(c)      If in compliance with the provisions of this clause anything is done
         or is not done such shall be deemed to be a permissible deviation

29.      WAR INSURANCE:

War and/or mine risk insurance if any shall be for Owners' account but
notwithstanding the provisions of clause 11 hereof war risk insurance on hull
and machinery on mutually agreed value in excess of the rate ruling at the date
hereof shall be for Charterers' account

30.      ADDITIONAL WAR RISKS:

Any extra expenses which may be incurred by Owners if the Vessel with the
consent of Owners is obliged by Charterers or on Charterers' requirements to
trade in areas where there is war (de facto or de jure) shall be borne by
Charterers, provided that before such expenses are incurred Charterers are
given an opportunity to signify their approval

31.      RESPONSIBILITY AND INDEMNITY:

(a)      Charterers shall not be responsible for damage to or in connection
         with loss of the Vessel howsoever caused including personal injury or
         death of Owners' servants or anyone to whom Owners may be responsible
         in this respect howsoever or by whomsoever caused even if caused by
         act neglect or default of anyone for whom otherwise Charterers might
         be responsible and Owners shall indemnify Charterers against all
         consequences and liabilities arising from or in connection with such
         loss or damage or personal injury or death of Owners' servants or
         anyone to whom Owners may be responsible

(b)      Owners shall not be responsible for any damage to or loss of
         Charterers' goods or equipment or that of their associated companies
         or clients fitted in or to or carried on board or towed by the Vessel
         or any damage to or loss of the off shore installation to which the
         Vessel is ordered by Charterers howsoever or by whomsoever caused even
         if caused by act neglect or default of any one for whom otherwise
         Owners might be responsible and Charterers shall hold harmless and
         indemnify Owners from and against all liabilities arising from or
         relating to such loss or damage including liability for personal
         injury or death sustained by Charterers' servants and/or those of
         their associated companies or of their clients and/or anyone to whom
         Charterers may be responsible resulting from or occurring in
         connection with such loss or damage insofar as such person was in
         attendance and/or was on board the Vessel and/or was at any time that
         the personal injury or death was caused or incurred being carried by
         the Vessel to or





                                     - 13 -
<PAGE>   14
         from such off shore installation and/or other place or places at
         Charterers' request

32.      LIMITATIONS:

Nothing herein contained in this agreement shall be construed or held to
deprive Owners or Charterers of any right to claim limitation of liability
provided by any applicable law statute or convention

33.      PRESERVATION OF SECRECY:

All information regarding Charterers' client operation investigations and
findings together with the nature and specification of Charterers' equipment
installed on board the Vessel shall be regarded as confidential to the
Charterers and under no circumstances shall any such information be divulged to
unauthorized persons or the press without prior permission of Charterers.  This
ruling shall be incumbent upon all personnel for whom Owners have
responsibility.  Owners shall ensure that all Owners' subcontractors give an
indemnity to observe the requirements of this clause

34.      CHANGE OF OWNERSHIP:

(a)      Owners' rights and obligations under this charter are not
         transferrable by sale without Charterers' consent and Owners will make
         application for consent to sale in good and sufficient time for
         Charterers' consideration.  Should any such sale take place Owners
         shall reimburse Charterers with any hire paid in advance and not
         earned and the cost of fuel and bunkers.

(b)      Owners shall be entitled to require the affixing to the Vessel of a
         suitably worded notice indicating that the Vessel is bareboat
         chartered to Owners and that no liens are to be created

(c)      Charterers shall be entitled to affix notices to their equipment
         indicating ownership of the same and that no liens shall be created on
         this equipment other than under clause 10 hereof.

35.  LAW AND LITIGATION:

(a)      This charter shall be construed and the relations between the parties
         determined in accordance with the Law of England

(b)      If any dispute difference or question shall arise at any time
         hereafter between the parties hereto concerning any matter or thing
         whatsoever herein contained or the operation or construction thereof
         or any matter or thing in any way





                                     - 14 -
<PAGE>   15
         connected with these presents or the rights duties or liabilities of
         either party under or in connection with this Agreement then and in
         every such case the dispute or difference shall be referred to a
         single arbitrator in London to be agreed between the parties hereto or
         failing agreement within fourteen days after either party has given to
         the other a written request to concur in the appointment of an
         arbitrator one arbitrator to be appointed by each party hereto in
         accordance with the Arbitration Acts 1950 and 1979 or any statutory
         modification or re-enactment thereof for the time being in force.  It
         is further agreed that such arbitration shall be a condition precedent
         to the commencement of any action of law

36.      REDELIVERY:

The Vessel shall be re-delivered on the expiration or earlier termination of
this Charter Party in the same good order as when delivered to the Charterers
(fair wear and tear excepted) but after refurbishing as provided in clause 18
(except as therein provided in the event of the sale by the owners of the
Vessel together with the equipment).  "On hire" and "off hire" surveys will be
carried out by a surveyor mutually agreed between both parties.  Repairs of any
damage that may have occurred during time period of the charter by the nature
of the charter shall be for Charterers' expense together with the cost of
survey and charter hire to be paid for the time incurred in carrying out such
repairs.

DATED this fourth day of February 1981.



SIGNED by                         /s/ [illegible signature]
on behalf of Owners               /s/ [illegible signature]
                                  /s/ [illegible signature]

SIGNED by
on behalf of Charterers           /s/ [illegible signature]

In the presence
of Stephen Williams
Solicitor





                                     - 15 -
<PAGE>   16
                           "SUBSEA 1" to be re-named

                               "PACIFIC HORIZON"

                                  O/N. 6413807

PORT OF REGISTRY: LONDON                   SIGNAL LETTERS: G.U.Q.A.

BUILT BY: A.G. "WESER" WERK SEEBECK, BREMERHAVEN, W. GERMANY. 1964

REBUILT: GLOBE ENGINEERING (HULL) LIMITED, HULL. 1981

PRINCIPAL DIMENSIONS: 79.69m x 12.65m x 4.80lm

DISPLACEMENT: G.R.T.    N.R.T.

LOADED DRAUGHT:

CLASSIFICATION: LLOYDS + 100A1 SEISMIC SURVEY VESSEL

SAFCON: YES                       LOADLINE: YES

U.K. D.O.T. CLASSIFICATION: CLASS VII UNRESTRICTED

MAIN PROPULSION: 3 DEUTZ DIESEL ELECTRIC GENERATORS 2700 B.H.P.

MAIN PROPULSION MOTOR: A.E.G.

SPEED:                            CONSUMPTION:

MANOEUVRING/SECONDARY PROPULSION: SCHOTTEL UNIT

BUNKERS:                          ENDURANCE:

FRESH WATER:                      CRUISING:

ACCOMMODATION:   CHARTERERS
                 AND CREW  ) TOTAL 43 PERSONS

L.S.A. CERTIFICATION:     50 PERSONS

NAVIGATIONAL AND ELECTRONIC AIDS:

MAIN AND SECONDARY SSB TRANSEIVERS

TELEX FOR OPERATION WITH MAIN TRANSEIVER

R408 COMMUNICATION RECEIVER

STANDBY DISTRESS RECEIVER

DEBEG V.H.F. RECEIVER





                                     - 16 -
<PAGE>   17
ROBERTSON V.H.F. RECEIVER

EMERGENCY TRANSEIVER SOLAS TYPE 3

TWO 1022 FURONO RADARS

ONE RM426 DECCA RADAR             KODEN WEATHER FAX

WALKER SPEED LOG                  DECCA NAV. MK.21

ELAC ECHO SOUNDER                 ANSCHULTZ GYRO/A. PILOT





                                     - 17 -

<PAGE>   1
                                                                 EXHIBIT 10.12
                     TERMS AND CONDITIONS OF EMPLOYMENT

                             P A R T I C U L A R S

PARTIES AND DEFINITIONS:

Statement of employment particulars required in accordance with the Employment
Protection (Consolidation) Act 1978 (as amended) Sections 1 to 6 inclusive:

<TABLE>
<S>      <C>                               <C>     <C>
1.       Name of the Company               :       Exploration Holdings Limited of 6 Pembroke Road, Sevenoaks, Kent TN13
                                                   IXR

2.       Name of the Executive             :       Gerald Martin Harrison of Gorsey Down Farm, Ricketts Hill Road,
                                                   Tatsfield, Surrey TN16 2NB

3.       Date of commencement
         of employment                     :

4.       Date of commencement of
         continuous employment             :

5.       Job title                         :       Managing Director

6.       Salary                            :       L.134,000

7.       Annual Review Data                :       1st May

8.       Payment Date                      :       15th of each month

9.       Hours of work                     :       See clause 1.3

10.      Holiday                           :       25 working days per calendar year

11.      Place of work                     :       See clause 1.2

12.      Disciplinary rules                :       See clause 27

13.      Period of notice to be given      :       36 months
</TABLE>
<PAGE>   2
RECITAL:

The Company has agreed to employ the Executive and the Executive has agreed to
serve the Company from the date shown in the Particulars upon the following
terms.

1.       EMPLOYMENT AND DUTIES

         1.1     The Company will employ the Executive and the Executive will
serve the Company in accordance with the Job Title shown in the Particulars and
in such capacity shall perform the duties and exercise the powers which may
from time to time be assigned in or vested in the Executive by the board of
directors of the Company ("the Board") and shall in the discharge of such
duties and the exercise of such powers observe and comply with all resolutions
and directors from time to time made or given by the Board and shall devote
substantially the whole of the Executive's time and attention during normal
business hours (unless prevented by ill health) to the performance of the
Executive's duties under the terms of this Agreement.

         1.2     The duties of the Executive will be performed principally from
the Company's premises provided that:

                 1.2.1    the Executive shall travel to and from work at such
         locations both within and outside the United Kingdom as are required
         for the proper performance of the Executive's duties and

                 1.2.2    the Executive may be required to work at any of the
         Company's premises or at the premises of its customers' clients or
         suppliers on a temporary basis.

1.3      The Executive shall comply with the Company's normal hours of work for
office staff and shall perform any additional hours of work which are
reasonably required for the proper performance of the Executive's duties.  The
Executive shall not be entitled to any additional remuneration for work
performed outside the Company's normal hours of business.

1.4      The Company reserves the right to change the Company's premises and
will give the Executive at least one month's notice of the change and details
of its relocation policy where appropriate.  PROVIDED THAT

                 1.4.1    the relocation shall have no negative financial
impact on the Executive

                 1.4.2    the relocation shall be within England.

2.       APPOINTMENT AS DIRECTOR





                                      2
<PAGE>   3
         During the term of this Agreement the Executive will if required by
the Board serve as a director of the Company and (if so required by the Board)
as a director or officer of any subsidiary or associated company of the Company
but shall not be entitled to any director's fees or other remuneration except
as provided in this Agreement in respect of any such directorship or office.

3.       TERM OF EMPLOYMENT

         The Executive shall continue to hold such office until this Agreement
is terminated by either Party giving to the other the period of notice provided
in the particulars.

4.       SALARY

         The Company shall during the continuance of the Executive's
appointment under the terms of this Agreement pay to the Executive the salary
shown in the Particulars by equal monthly installments on the Payment Date such
salary to be reviewed annually as at the Annual Review Date in each year.

5.       SALARY REVIEW

         5.1     The salary shall be reviewed with effect from the Annual
Review Date and each succeeding year during the continuance of this Agreement.

         5.2     Any change in salary will be made at the Company's absolute
discretion.

6.       EXPENSES

         In addition to the salary the Company shall pay to the Executive
during the continuance of the Executive's appointment under the terms of this
Agreement such travelling hotel and other expenses as may be properly incurred
by the Executive in the performance of the Executive's duties under the terms
of this Agreement subject to the presentation of all necessary vouchers or
receipts in respect of such expenses.

7.       PROVISION OF CAR

         During the Executive's employment under the terms of this Agreement,
the Company will supply the Executive with a car of a design and manufacturer
to be determined by the Company in accordance with the Company's executive car
policy from time to time in force and will maintain the car and pay all running
expenses in connection with the car including the Road Fund License and
insurance premiums and the cost of petrol consumed in the course of private
motoring.

8.       PROVISION OF MEDICAL INSURANCE





                                      3
<PAGE>   4
         During the Executive's employment under the term of this Agreement the
Company shall provide, at the Company's expense, medical insurance on an
international basis, including repatriation, for the Executive, the Executive's
spouse and the Executive's children subject to the children being under the age
of 18 or in full-time education.

9.       PERSONAL EFFECTS

         During the Executive's employment under the term of this Agreement the
Company shall indemnify the Executive against any loss of or damage of personal
effects (with the exception of a motor vehicle) whilst the Executive is at work
or travelling to and from work or required to stay away from the Executive's
normal residence for the purpose of or related to the business of the Company.

10.      HOLIDAYS

         The Executive shall in addition to the normal public bank holidays be
entitled to the holiday shown in the Particulars to be taken at such times as
shall be agreed between the Executive and the Board (and in termination of the
Executive's employment the Executive's entitlement to accrued holiday pay will
be in direct proportion to the length of the Executive's service during the
calendar year in which termination takes place).

11.      INCAPACITY

         11.1    In the case of illness of the Executive or any other cause
incapacitating the Executive from duly attending to the Executive's duties, the
Executive shall receive the Executive's full salary during the first six months
or any shorter period AND if the Executive shall continue so incapacitated for
a longer period than 6 consecutive months or if the Executive shall be so
incapacitated at different times for more than 180 days in one period of 52
consecutive weeks then and in ether such case the Executive's employment shall
at the option of the Board be determined on one month's notice or such further
period of notice to which the Executive may be entitled by statute and all
arrears of salary and expenses shall be paid to the Executive.

         11.2    If the Executive is absent from work due to sickness or injury
which continues for more than 7 days (including weekends) the Executive may be
required by the Company to provide a medical certificate by the eight day of
sickness or injury.  Thereafter, medical certificates may be required by the
Company to cover any continued absence.

         11.3    Immediately following the Executive's return to work after a
period of absence which has previously been authorized by the Company, the
Executive is required to complete a self-certification form stating the dates
and reason for the Executive's absence including details of sickness on
non-working days as this information is required by the Company for calculating
statutory sick pay entitlement.  Self-certification forms will be retained in
the Company's records.





                                      4
<PAGE>   5
         11.4    The salary due to the Executive during the period of
incapacity will be inclusive of any Statutory Sick Pay to which the Executive
is entitled.

         11.5    The Company reserves the right for the Executive to be
examined at any time by an independent doctor at its expense and to cease
payment of any form of sick pay if it is advised by the doctor that the
Executive is fit to return to work.

12.      PENSION SCHEME

         During the Executive's employment under the terms of this Agreement
the Company will  make all necessary arrangements for the Executive to be a
member of whatever contributory pension scheme the Company may arrange or may
have arranged providing such benefits as have been agreed between the parties
and are set out in the documents constituting such scheme copies of which have
been or will be supplied to the Executive including membership of a permanent
health and injury scheme which shall provide, subject to insurers' conditions,
income in the Executive of not less that 66% of current net income in the event
o f illness or incapacity of more than 6 months or 6 months in any consecutive
period of 52 weeks.

13.      INCENTIVE SCHEME

         13.1    The Executive shall be entitled to participate in a Company
Executive Incentive Scheme ("the Scheme") which, subject to the conditions
below, shall give the Executive the potential to receive additional
remuneration of up to 50% of salary each year.

                 13.1.1   The Company shall define the Scheme annually on or
         before February 28th in each year for the Calendar year to which it
         relates.

                 13.1.2   The Scheme may take the form of a single Company goal
         for example profit performance or several individual targets such as
         productivity, etc., and may be varied each year.

                 13.1.3   Any remuneration earned under the Scheme for a
         particular year shall be paid on or before 1st June of the following
         calendar year.

14.      TERMINATION

         This Agreement shall be subject to summary termination by the Company
by notice in writing if the Executive shall have committed any serious breach
or continued in any persistent breach of the Executive's obligations under the
terms of this Agreement or shall have committed an act of bankruptcy or
compounded with the Executive's creditors generally.

15.      RESIGNATION FROM DIRECTORSHIP





                                      5
<PAGE>   6
         Upon the termination of this Agreement for whatever reason, the
Executive shall, upon the request of the Company, resign without claim for
compensation from office as a director of the Company and from all offices held
by the Executive in subsidiary or associated companies of the Company and in
the event of the Executive's failure to do so.  THE COMPANY IS IRREVOCABLY
AUTHORIZED to appoint some person in the Executive's name and on the
Executive's behalf to execute any documents and to do all things requisite to
give effect thereto PROVIDED THAT any such resignation shall be without
prejudice to any claims arising out of or in respect of the termination of the
Executive's employment by the Company.

16.      CONFIDENTIAL INFORMATION

         16.1    The Executive shall not, except as authorized or required by
the Executive's duties, reveal to any person or company any of the trade
secrets, secret or confidential operations or dealings or any information
concerning the organization business finances transactions or affairs of the
Company which may come to the Executive's knowledge during the Executive's
employment under the terms of this Agreement and shall keep with complete
secrecy all confidential information entrusted to the Executive and shall not
use or attempt to use any such information in any manner which may injure or
cause loss either directly or indirectly to the Company or the Company's
business or which may be likely to do so.

         16.2    If the Company shall have obtained trade secrets or other
confidential information from any third party under an agreement including
restrictions on disclosure known to the Executive, then the Executive will not,
without the consent of the Company at any time (whether during the Executive's
service or after the termination of the Executive's service), infringe such
restrictions.

         16.3    The Executive shall not during the continuance of this
Agreement make otherwise than for the benefit of the Company any notes or
memoranda relating to any matter within the scope of the business of the
Company or concerning any of the Company's dealings or affairs nor shall the
Executive either during the continuance of this Agreement or afterwards use or
permit to be used any such notes or memoranda otherwise than for the benefit of
the Company it being the intention of the parties that all such notes or
memoranda made by the Executive shall be the property of the Company and left
at the Company's registered office upon the termination of the Executive's
employment under the terms of this Agreement.

17.      RESTRICTIVE COVENANT

         17.1    The Executive AGREES that the Executive will not, following
the termination of this Agreement, for whatever cause:

                 17.1.1   within a period of twelve months thereafter seek to
         employ (in relation to any business which competes with the business
         of the Company as at the date of such termination) any person who was
         employed by the Company during a period of three months prior to the
         termination of this Agreement nor procure that any such





                                      6
<PAGE>   7
         period be employed or offered employment by any other person, firm or
         company and in relation to any such business.

                 17.1.2   at any time thereafter represent the Executive as
         being in any way connected with or interested in the Company or any
         business carried on by the Company.

         17.2    In this clause references to any act or conduct of the
Executive shall include such act or conduct whether done directly or indirectly
and whether along or jointly with or as employee of or agent for any other
person, firm or company.

18.      REASONABLENESS OF RESTRICTIONS

         The Executive ACKNOWLEDGES AND AGREES that:

         18.1    the direction, extent and application of each of the
restrictions set out in clause 17 are no greater than is reasonably necessary
for the protection of the legitimate interests of the Company in its business,
and

         18.2    if any such restriction shall be adjudged by any Court of
competent jurisdiction to be void or unenforceable but would be valid if part
of the wording of such restriction were deleted and/or the period of such
restriction or the area specified in such restriction was reduced then the
Executive agrees that such restriction shall apply and be binding on the
Executive as so amended and/or reduced.

19.      OTHER OCCUPATIONS

         The Executive shall not without the consent of the Company during the
continuance of this Agreement be engaged or interested either directly or
indirectly in any capacity in any trade business or occupation whatsoever other
than the business of the Company (save as the holder by way of investment only
of shares or securities issued by any company).  In this clause, the expression
"occupation" shall include any public or private appointment office or work
which in the reasonably opinion of the Company shall hinder or otherwise
interfere with the performance by the Executive of the Executive's duties under
this Agreement.

20.      INVENTIONS AND DISCOVERIES

         20.1    Any discovery or invention or secret process made or
discovered by the Executive (either alone or with any other person) while in
the service of the Company in connection with or in any way affecting or
relating to the business of the Company or any of the Company's subsidiary or
associated companies for the time being or in the opinion of the Board, capable
of being used or adapted for use therein or in connection therewith shall be
forthwith disclosed to the Company and shall be the absolute property of the
Company.





                                      7
<PAGE>   8
         20.2    The Executive shall if any whenever required so to do by the
Company at the expense of the Company apply or join with the Company in
applying for letters patent or other protection in any part of the world for
any such discovery invention or process and shall, at the expense of the
Company, executive or procure to be executed all instruments or documents
necessary for vesting letters patent or other protection when obtained and all
right, title and interest thereto in the Company absolutely or in such other
person as the Company may require.

         20.3    For the purpose of this clause THE EXECUTIVE IRREVOCABLY
APPOINTS the Company as the Executive's attorney in the Executive's name to
execute and do all documents and things which are required in order to give
effect to the provisions of this clause.

21.      COMPULSORY PAID LEAVE

         21.1    At any time after a notice has been served by either party
pursuant to clause 3 the Company may require the Executive to take paid leave
for the period (ore the balance of the period) of such notice and during such
period:

                 21.1.1   the Company shall have no obligation to provide work
         or to require the Executive to perform any duties;

                 21.1.2   the Executive shall receive the Executive's full
         salary and other benefits in accordance with the Agreement;

                 21.1.3   the provisions of clause 19 shall cease to apply but
         only in respect of any occupation which is not directly or indirectly
         concerned with any business which competes with any business of the
         Company PROVIDED THAT the Executive shall keep accurate records of any
         income or benefits received or receivable by him in respect of such
         occupation and shall notify the Company thereof and the Company may at
         its discretion deduct or set off all or part of such income or
         benefits from or against the salary and other benefits payable by the
         Company to the Executive during or in respect of such period.

22.      CONTINUATION OF PROVISIONS

         The expiration or determination of this Agreement howsoever arising
shall not affect such of the provisions of this Agreement as are expressed to
have effect or operate thereafter and shall be without prejudice to any right
of action already accrued to either party in respect of any breach of this
Agreement by the other party.

23.      COMPANY RECONSTRUCTION

         If before the termination of this Agreement:





                                      8
<PAGE>   9
         23.1    the employment of the Executive under the terms of this
Agreement shall be determined by reason of the winding up of the Company for
the purpose of the Company's reconstruction or amalgamation and the Company
shall procure that any company or undertaking resulting from such
reconstruction or amalgamation shall offer to the Executive employment on terms
as to remuneration and otherwise not less favorable to the Executive than those
provided by this Agreement and for the residue of the period of this Agreement
or for such other period as may be mutually agreed; or

         23.2    the Company's holding company or any subsidiary thereof or of
the Company shall at any time during the continuance of this Agreement offer to
employ the Executive in the place of the Company on terms as to remuneration and
otherwise not less favorable to the Executive than those provided by this
Agreement and for the residue of the period of this Agreement and the Company
shall thereupon terminate this Agreement then in either such case the
termination of this Agreement shall be deemed not to be in breach of the
provisions of this Agreement and there will be no change to the date of
commencement of continuous employment shown in the Particulars and subject to
the appropriate statutory provisions the Executive shall have to claim against
the Company for damages or otherwise in connection with or arising from such
termination.

24.      STATUTORY PARTICULARS

         The particulars which are required to be included in the written
statement required by the Employment Protection (Consolidation) Act 1978 (as
amended) Sections 1 to 6 inclusive are set out in the Particulars.

25.      INTERPRETATION

         In this Agreement and unless the context otherwise requires:

         25.1    the paragraph headings are for reference purposes only and
shall not affect interpretation;

         25.2    unless otherwise stated a reference to a clause or sub-clause
is a reference to the clause or sub-clause so numbered to this Agreement;

         25.3    the express "the Company" shall be deemed to include any
subsidiary or  holding company of the Company as defined in the Companies Act
1985 Section 736 and "subsidiary company" shall have the meaning defined in the
Section;

         25.4    words importing one gender include the other genders and words
importing the singular include the plural and vice versa.

26.      NOTICES





                                      9

<PAGE>   10
         Notices may be given by either party by letter telegram or telex
addressed to the other party at (in the case of the Company) the Company's
registered office for the time being and (in the case of the Executive) the
Executive's last known address and any such notice given by letter shall be
deemed to have been given at the time at which the letter would be delivered in
the ordinary course of post.

27.      PREVIOUS CONTRACTS OF SERVICE

         This Agreement is in substitution for all previous contracts of
service between the Company and the Company's subsidiary or associated
companies and the Executive which shall be deemed to have been terminated by
mutual consent as from the date on which this Agreement commences.

28.      DISPUTES

         In the case of any dispute or difference arising between the parties
as to the construction of this Agreement or the rights, duties or obligations
on either party under the terms of this Agreement or any matter arising out of
or concerning the same or the Executive's employment under the terms of this
Agreement every such dispute and matter and difference shall be referred to a
single arbitrator in accordance with the provisions of the Arbitration Acts
1950 to 1979 or any statute for the time being replacing, extending or
modifying the same.

29.      DISCIPLINARY AND GRIEVANCE PROCEDURE

         29.1    If the Executive has a grievance relating to the Executive's
employment, the Executive should proceed in accordance with the Company's
grievance procedure which is set out in Appendix A but which does not form part
of the Executive's Terms and Conditions of Employment.

         29.2    The Company deals with disciplinary matters in accordance with
its disciplinary procedures which are set out in Appendix A but which do not
form part of the Executive's Terms and Conditions of Employment.

         29.3    Following any disciplinary procedure a complaint against the
Executive is upheld, the Company reserves the right to impose any one or more
of the following penalties on the Executive instead of a first or final warning
or dismissal with or without notice.

                 29.3.1   Demotion:  The Company may demote the Executive by
         notice in writing giving details of any consequential changes to the
         Executive's Terms and Conditions of Employment in particular the
         notice will give details of any reduction to the Executive's salary
         and/or loss of any benefits and/or privileges consequent upon such
         demotion.





                                     10
<PAGE>   11
                 29.3.2   Suspension:  The Company may suspend the Executive
         from work with or without notice in writing to this effect.  Such
         notice will specify the dates of the Executive's suspension, the
         conditions applicable to the Executive's suspension and the period of
         suspension.


SIGNED AS A DEED                           )
BY THE COMPANY                             )       /s/ NEIL A.M. CAMPBELL
ACTING BY ITS DIRECTOR AND SECRETARY       )

SIGNED AS A DEED                           )       /s/ GERALD M. HARRISON
BY THE EXECUTIVE                           )





                                     11
<PAGE>   12
                                  APPENDIX A.

                     GRIEVANCE AND DISCIPLINARY PROCEDURES

1.       GRIEVANCE PROCEDURE.

         1.1     If you have any grievance relating to your employment you
should raise the matter initially with your chairman.  You may be required to
put any such grievance in writing.

         1.2     Having inquired into your grievance, your Chairman will
discuss it with you and will then notify you of his decision.

         1.3     If the decision of your Chairman is not acceptable, you may
then refer the matter in writing to the Company's Board ("the Board") whose
decision will be final and binding.

         1.4     When stating grievances, you may be accompanied by a fellow
employee of your choice.

2.       DISCIPLINARY PROCEDURES.

         2.1     The purposes of the disciplinary procedures is to ensure that
the Company behaves fairly in investigating and dealing with the allegations of
unacceptable conduct or performance.  Accordingly, the Company reserves the
right to depart from the precise requirements of its disciplinary procedure
where it is expedient to do so and where the resulting treatment of the
employee is no less fair.

         2.2     All cases of disciplinary action under these procedures will
be recorded and placed in the Company's records.  A copy of the Company's
disciplinary records concerning you will be supplied to you at your request.

         2.3     Offenses under the Company's procedures fall into 3 categories
namely:

                 o        misconduct
                 o        gross misconduct
                 o        incapability

         2.4     The following steps will be taken, as appropriate, in all
cases of disciplinary action:

                 2.4.1    Investigations:  No action will be taken before a
         proper investigation has been undertaken by the Company into the
         matter complained of.  If appropriate, the Company may by written
         notice suspend you while the investigation takes place.  If you are so
         suspended your contract of employment will continue together with all
         your rights under your contract will not be entitled to access in any
         of the Company's period of suspension, you will not be entitled to
         access to any of the Company's premises






<PAGE>   13
         except at the prior request or with the prior consent of the Company
         and subject to such conditions as the Company may impose.  The
         decision to suspend you will be notified to you by the Company and
         confirmed in writing.

                 2.4.2    Disciplinary Hearings:  If the Company decides to
         hold a disciplinary hearing about the matter complained of, you will
         be given details of the complaint against you at least three working
         days before the hearing.  At the hearing, you will be given an
         opportunity to state your case.  You may be accompanied by a fellow
         employee of your choice.  No disciplinary penalty will be imposed
         without a disciplinary hearing, but a hearing may proceed in your
         absence if you fail to turn up.

                 2.4.3    Appeals:  You have a right to appeal against any
         disciplinary decision to the Board.  You should inform the Board in
         writing of your wish to appeal within five working days of the date of
         the decision which forms the subject of your appeal.

                          The Chairman, as appropriate, will conduct an appeal
         hearing as soon as possible thereafter at which you will be given an
         opportunity to state your case and will be entitled to be accompanied
         by a fellow employee of your choice.

                          The decision of the Chairman, as appropriate, will be
         notified to you in writing and will be final and binding under this
         procedure.

         2.5     MISCONDUCT.

                 2.5.1    The following offenses are examples of misconduct:

                          o       Bad time keeping;
                          o       Unauthorized absence;
                          o       Minor damages to Company property;
                          o       Minor breach of Company rules;
                          o       Failure to observe Company procedures;
                          o       Abusive behavior;
                          o       Sexual or racial harassment;
                          o       Dishonesty of any kind;
                          o       Negligence not amount to gross negligence.

                          These offenses are not exclusive or exhaustive and
         offenses of a similar nature will be dealt with under this procedure.

                 2.5.2    The following procedure will apply in cases of
         alleged misconduct:





                                      2
<PAGE>   14
                          First Warning:  This will be given by your Chairman
         and may be oral or written according to the circumstances.  In either
         event, you will be advised that the warning constitutes the first
         formal state of this procedure.  If the warning is verbal, a note that
         such a warning has been given will be placed in the Company's records.

                          Final Warning:  This will be given by your Chairman
         and confirmed to you in writing.  This warning will state that, if you
         commit a further offense of misconduct during the period specified in
         it, your employment will be terminated.

                          Dismissal:  The decision to dismiss you will not be
         taken without reference to the Chairman and will be notified to you in
         writing.

         2.6     GROSS MISCONDUCT.

                 2.6.1    The following offenses are examples of gross
                   misconduct:

                          o       Theft or unauthorized possession of any 
                                  property belonging to the Company or any
                                  employee;
                          o       Serious damage to Company property.
                          o       Falsification of reports, accounts, expense 
                                  claims or self-certification forms.
                          o       Refusal to carry out duties or reasonable 
                                  instructions.
                          o       Intoxication by reason of drink or drugs.
                          o       Having illegal drugs in your possession, 
                                  custody or control on the Company's premises.
                          o       Serious breach of Company rules.
                          o       Violent, dangerous or intimidatory conduct.
                          o       Sexual, racial or other harassment of a 
                                  fellow employee.
                          o       Gross negligence.

                          These examples are not exhaustive or exclusive and
                 offenses of a similar nature will be dealt with under this
                 procedure.

                 2.6.2    Gross misconduct will result in immediate dismissal
         without notice or pay in lieu of notice.  The decision to dismiss will
         not be taken without reference to the Chairman.  Dismissal will be
         notified to you in writing.

         2.7     INCAPABILITY.

                 2.7.1    The following are examples of incapability:





                                      3
<PAGE>   15
                          o       Poor performance;
                          o       Incompetence;
                          o       Unsuitability;
                          o       Lack of application.

                          These examples are not exhaustive or exclusive and
         instances of a similar nature will be dealt with under this procedure.

                 2.7.2    The following procedure will apply in cases of
         incapability:

                          First Warning:  This will be given by your Chairman
         and will be confirmed to you in writing.  This warning will specify
         the improvement required and will state that your work will be
         reviewed at the end of a specified period after the date of the
         warning.

                          Final Warning:  This will be given by your Chairman
         and confirmed to you in writing.  This warning will state that unless
         your work improves within a specified period after the date of the
         warning, your employment will be terminated.

                          Dismissal:  The decision to dismiss you will not be
         taken without reference to the Chairman.  Dismissal will be notified
         to you in writing.





                                      4

<PAGE>   1
                                                                 EXHIBIT 10.13

                     TERMS AND CONDITIONS OF EMPLOYMENT

                            P A R T I C U L A R S

PARTIES AND DEFINITIONS:

Statement of employment particulars required in accordance with the Employment
Protection (Consolidation) Act 1978 (as amended) Sections 1 to 6 inclusive:

<TABLE>
<S>      <C>                               <C>     <C>
1.       Name of the Company               :       Exploration Holdings Limited of 6 Pembroke Road, Sevenoaks, Kent TN13
                                                   IXR

2.       Name of the Executive             :       George Purdie, Merlins Brook, Park Road, Addington, West Malling,
                                                   Kent ME19 5BQ

3.       Date of commencement
         of employment                     :

4.       Date of commencement of
         continuous employment             :

5.       Job title                         :       Director, Operations

6.       Salary                            :       L.124,000

7.       Annual Review Data                :       1st May

8.       Payment Date                      :       15th of each month

9.       Hours of work                     :       See clause 1.3

10.      Holiday                           :       25 working days per calendar year

11.      Place of work                     :       See clause 1.2

12.      Disciplinary rules                :       See clause 27

13.      Period of notice to be given      :       36 months
</TABLE>
<PAGE>   2
RECITAL:

The Company has agreed to employ the Executive and the Executive has agreed to
serve the Company from the date shown in the Particulars upon the following
terms.

1.       EMPLOYMENT AND DUTIES

         1.1     The Company will employ the Executive and the Executive will
serve the Company in accordance with the Job Title shown in the Particulars and
in such capacity shall perform the duties and exercise the powers which may
from time to time be assigned in or vested in the Executive by the board of
directors of the Company ("the Board") and shall in the discharge of such
duties and the exercise of such powers observe and comply with all resolutions
and directors from time to time made or given by the Board and shall devote
substantially the whole of the Executive's time and attention during normal
business hours (unless prevented by ill health) to the performance of the
Executive's duties under the terms of this Agreement.

         1.2     The duties of the Executive will be performed principally from
the Company's premises provided that:

                 1.2.1    the Executive shall travel to and from work at such
         locations both within and outside the United Kingdom as are required
         for the proper performance of the Executive's duties and

                 1.2.2    the Executive may be required to work at any of the
         Company's premises or at the premises of its customers' clients or
         suppliers on a temporary basis.

1.3      The Executive shall comply with the Company's normal hours of work for
office staff and shall perform any additional hours of work which are
reasonably required for the proper performance of the Executive's duties.  The
Executive shall not be entitled to any additional remuneration for work
performed outside the Company's normal hours of business.

1.4      The Company reserves the right to change the Company's premises and
will give the Executive at least one month's notice of the change and details
of its relocation policy where appropriate.  PROVIDED THAT

                 1.4.1    the relocation shall have no negative financial
         impact on the Executive

                 1.4.2    the relocation shall be within England.

2.       APPOINTMENT AS DIRECTOR





                                       2
<PAGE>   3
         During the term of this Agreement the Executive will if required by
the Board serve as a director of the Company and (if so required by the Board)
as a director or officer of any subsidiary or associated company of the Company
but shall not be entitled to any director's fees or other remuneration except
as provided in this Agreement in respect of any such directorship or office.

3.       TERM OF EMPLOYMENT

         The Executive shall continue to hold such office until this Agreement
is terminated by either Party giving to the other the period of notice provided
in the particulars.

4.       SALARY

         The Company shall during the continuance of the Executive's
appointment under the terms of this Agreement pay to the Executive the salary
shown in the Particulars by equal monthly installments on the Payment Date such
salary to be reviewed annually as at the Annual Review Date in each year.

5.       SALARY REVIEW

         5.1     The salary shall be reviewed with effect from the Annual
Review Date and each succeeding year during the continuance of this Agreement.

         5.2     Any change in salary will be made at the Company's absolute
discretion.

6.       EXPENSES

         In addition to the salary the Company shall pay to the Executive
during the continuance of the Executive's appointment under the terms of this
Agreement such travelling hotel and other expenses as may be properly incurred
by the Executive in the performance of the Executive's duties under the terms
of this Agreement subject to the presentation of all necessary vouchers or
receipts in respect of such expenses.

7.       PROVISION OF CAR

         During the Executive's employment under the terms of this Agreement,
the Company will supply the Executive with a car of a design and manufacturer
to be determined by the Company in accordance with the Company's executive car
policy from time to time in force and will maintain the car and pay all running
expenses in connection with the car including the Road Fund License and
insurance premiums and the cost of petrol consumed in the course of private
motoring.

8.       PROVISION OF MEDICAL INSURANCE





                                       3
<PAGE>   4
         During the Executive's employment under the term of this Agreement the
Company shall provide, at the Company's expense, medical insurance on an
international basis, including repatriation, for the Executive, the Executive's
spouse and the Executive's children subject to the children being under the age
of 18 or in full-time education.

9.       PERSONAL EFFECTS

         During the Executive's employment under the term of this Agreement the
Company shall indemnify the Executive against any loss of or damage of personal
effects (with the exception of a motor vehicle) whilst the Executive is at work
or travelling to and from work or required to stay away from the Executive's
normal residence for the purpose of or related to the business of the Company.

10.      HOLIDAYS

         The Executive shall in addition to the normal public bank holidays be
entitled to the holiday shown in the Particulars to be taken at such times as
shall be agreed between the Executive and the Board (and in termination of the
Executive's employment the Executive's entitlement to accrued holiday pay will
be in direct proportion to the length of the Executive's service during the
calendar year in which termination takes place).

11.      INCAPACITY

         11.1    In the case of illness of the Executive or any other cause
incapacitating the Executive from duly attending to the Executive's duties, the
Executive shall receive the Executive's full salary during the first six months
or any shorter period AND if the Executive shall continue so incapacitated for
a longer period than 6 consecutive months or if the Executive shall be so
incapacitated at different times for more than 180 days in one period of 52
consecutive weeks then and in ether such case the Executive's employment shall
at the option of the Board be determined on one month's notice or such further
period of notice to which the Executive may be entitled by statute and all
arrears of salary and expenses shall be paid to the Executive.

         11.2    If the Executive is absent from work due to sickness or injury
which continues for more than 7 days (including weekends) the Executive may be
required by the Company to provide a medical certificate by the eight day of
sickness or injury.  Thereafter, medical certificates may be required by the
Company to cover any continued absence.

         11.3    Immediately following the Executive's return to work after a
period of absence which has previously been authorized by the Company, the
Executive is required to complete a self-certification form stating the dates
and reason for the Executive's absence including details of sickness on
non-working days as this information is required by the Company for calculating
statutory sick pay entitlement.  Self-certification forms will be retained in
the Company's records.





                                       4
<PAGE>   5
         11.4    The salary due to the Executive during the period of
incapacity will be inclusive of any Statutory Sick Pay to which the Executive
is entitled.

         11.5    The Company reserves the right for the Executive to be
examined at any time by an independent doctor at its expense and to cease
payment of any form of sick pay if it is advised by the doctor that the
Executive is fit to return to work.

12.      PENSION SCHEME

         During the Executive's employment under the terms of this Agreement
the Company will  make all necessary arrangements for the Executive to be a
member of whatever contributory pension scheme the Company may arrange or may
have arranged providing such benefits as have been agreed between the parties
and are set out in the documents constituting such scheme copies of which have
been or will be supplied to the Executive including membership of a permanent
health and injury scheme which shall provide, subject to insurers' conditions,
income in the Executive of not less that 66% of current net income in the event
o f illness or incapacity of more than 6 months or 6 months in any consecutive
period of 52 weeks.

13.      INCENTIVE SCHEME

         13.1    The Executive shall be entitled to participate in a Company
Executive Incentive Scheme ("the Scheme") which, subject to the conditions
below, shall give the Executive the potential to receive additional
remuneration of up to 50% of salary each year.

                 13.1.1   The Company shall define the Scheme annually on or
         before February 28th in each year for the Calendar year to which it
         relates.

                 13.1.2   The Scheme may take the form of a single Company goal
         for example profit performance or several individual targets such as
         productivity, etc., and may be varied each year.

                 13.1.3   Any remuneration earned under the Scheme for a
         particular year shall be paid on or before 1st June of the following
         calendar year.

14.      TERMINATION

         This Agreement shall be subject to summary termination by the Company
by notice in writing if the Executive shall have committed any serious breach
or continued in any persistent breach of the Executive's obligations under the
terms of this Agreement or shall have committed an act of bankruptcy or
compounded with the Executive's creditors generally.

15.      RESIGNATION FROM DIRECTORSHIP





                                       5
<PAGE>   6
         Upon the termination of this Agreement for whatever reason, the
Executive shall, upon the request of the Company, resign without claim for
compensation from office as a director of the Company and from all offices held
by the Executive in subsidiary or associated companies of the Company and in
the event of the Executive's failure to do so.  THE COMPANY IS IRREVOCABLY
AUTHORIZED to appoint some person in the Executive's name and on the
Executive's behalf to execute any documents and to do all things requisite to
give effect thereto PROVIDED THAT any such resignation shall be without
prejudice to any claims arising out of or in respect of the termination of the
Executive's employment by the Company.

16.      CONFIDENTIAL INFORMATION

         16.1    The Executive shall not, except as authorized or required by
the Executive's duties, reveal to any person or company any of the trade
secrets, secret or confidential operations or dealings or any information
concerning the organization business finances transactions or affairs of the
Company which may come to the Executive's knowledge during the Executive's
employment under the terms of this Agreement and shall keep with complete
secrecy all confidential information entrusted to the Executive and shall not
use or attempt to use any such information in any manner which may injure or
cause loss either directly or indirectly to the Company or the Company's
business or which may be likely to do so.

         16.2    If the Company shall have obtained trade secrets or other
confidential information from any third party under an agreement including
restrictions on disclosure known to the Executive, then the Executive will not,
without the consent of the Company at any time (whether during the Executive's
service or after the termination of the Executive's service), infringe such
restrictions.

         16.3    The Executive shall not during the continuance of this
Agreement make otherwise than for the benefit of the Company any notes or
memoranda relating to any matter within the scope of the business of the
Company or concerning any of the Company's dealings or affairs nor shall the
Executive either during the continuance of this Agreement or afterwards use or
permit to be used any such notes or memoranda otherwise than for the benefit of
the Company it being the intention of the parties that all such notes or
memoranda made by the Executive shall be the property of the Company and left
at the Company's registered office upon the termination of the Executive's
employment under the terms of this Agreement.

17.      RESTRICTIVE COVENANT

         17.1    The Executive AGREES that the Executive will not, following
the termination of this Agreement, for whatever cause:

                 17.1.1   within a period of twelve months thereafter seek to
         employ (in relation to any business which competes with the business
         of the Company as at the date of such termination) any person who was
         employed by the Company during a period of three months prior to the
         termination of this Agreement nor procure that any such





                                       6
<PAGE>   7
         period be employed or offered employment by any other person, firm or
         company and in relation to any such business.

                 17.1.2   at any time thereafter represent the Executive as
         being in any way connected with or interested in the Company or any
         business carried on by the Company.

         17.2    In this clause references to any act or conduct of the
Executive shall include such act or conduct whether done directly or indirectly
and whether along or jointly with or as employee of or agent for any other
person, firm or company.

18.      REASONABLENESS OF RESTRICTIONS

         The Executive ACKNOWLEDGES AND AGREES that:

         18.1    the direction, extent and application of each of the
restrictions set out in clause 17 are no greater than is reasonably necessary
for the protection of the legitimate interests of the Company in its business,
and

         18.2    if any such restriction shall be adjudged by any Court of
competent jurisdiction to be void or unenforceable but would be valid if part
of the wording of such restriction were deleted and/or the period of such
restriction or the area specified in such restriction was reduced then the
Executive agrees that such restriction shall apply and be binding on the
Executive as so amended and/or reduced.

19.      OTHER OCCUPATIONS

         The Executive shall not without the consent of the Company during the
continuance of this Agreement be engaged or interested either directly or
indirectly in any capacity in any trade business or occupation whatsoever other
than the business of the Company (save as the holder by way of investment only
of shares or securities issued by any company).  In this clause, the expression
"occupation" shall include any public or private appointment office or work
which in the reasonably opinion of the Company shall hinder or otherwise
interfere with the performance by the Executive of the Executive's duties under
this Agreement.

20.      INVENTIONS AND DISCOVERIES

         20.1    Any discovery or invention or secret process made or
discovered by the Executive (either alone or with any other person) while in
the service of the Company in connection with or in any way affecting or
relating to the business of the Company or any of the Company's subsidiary or
associated companies for the time being or in the opinion of the Board, capable
of being used or adapted for use therein or in connection therewith shall be
forthwith disclosed to the Company and shall be the absolute property of the
Company.





                                       7
<PAGE>   8
         20.2    The Executive shall if any whenever required so to do by the
Company at the expense of the Company apply or join with the Company in
applying for letters patent or other protection in any part of the world for
any such discovery invention or process and shall, at the expense of the
Company, executive or procure to be executed all instruments or documents
necessary for vesting letters patent or other protection when obtained and all
right, title and interest thereto in the Company absolutely or in such other
person as the Company may require.

         20.3    For the purpose of this clause THE EXECUTIVE IRREVOCABLY
APPOINTS the Company as the Executive's attorney in the Executive's name to
execute and do all documents and things which are required in order to give
effect to the provisions of this clause.

21.      COMPULSORY PAID LEAVE

         21.1    At any time after a notice has been served by either party
pursuant to clause 3 the Company may require the Executive to take paid leave
for the period (ore the balance of the period) of such notice and during such
period:

                 21.1.1   the Company shall have no obligation to provide work
         or to require the Executive to perform any duties;

                 21.1.2   the Executive shall receive the Executive's full
         salary and other benefits in accordance with the Agreement;

                 21.1.3   the provisions of clause 19 shall cease to apply but
         only in respect of any occupation which is not directly or indirectly
         concerned with any business which competes with any business of the
         Company PROVIDED THAT the Executive shall keep accurate records of any
         income or benefits received or receivable by him in respect of such
         occupation and shall notify the Company thereof and the Company may at
         its discretion deduct or set off all or part of such income or
         benefits from or against the salary and other benefits payable by the
         Company to the Executive during or in respect of such period.

22.      CONTINUATION OF PROVISIONS

         The expiration or determination of this Agreement howsoever arising
shall not affect such of the provisions of this Agreement as are expressed to
have effect or operate thereafter and shall be without prejudice to any right
of action already accrued to either party in respect of any breach of this
Agreement by the other party.

23.      COMPANY RECONSTRUCTION

         If before the termination of this Agreement:





                                       8
<PAGE>   9
         23.1    the employment of the Executive under the terms of this
Agreement shall be determined by reason of the winding up of the Company for
the purpose of the Company's reconstruction or amalgamation a nd the Company
shall procure that nay company or undertaking resulting from such
reconstruction or amalgamation shall offer to the Executive employment on terms
as to remuneration and otherwise not less favorable to the Executive than those
provided by this Agreement and for the residue of the period of this Agreement
or for such other period as may be mutually agreed; or

         23.2    the Company's holding company or any subsidiary thereof or of
the Company shall at any time during the continuance of this Agreement offer to
employ the Executive in the place of the Company on terms s to remuneration and
otherwise not less favorable to the Executive than those provided by this
Agreement and for the residue of the period of this Agreement and the Company
shall thereupon terminate this Agreement then in either such case the
termination of this Agreement shall be deemed not to be in breach of the
provisions of this Agreement and there will be no change to the date of
commencement of continuous employment shown in the Particulars and subject to
the appropriate statutory provisions the Executive shall have to claim against
the Company for damages or otherwise in connection with or arising from such
termination.

24.      STATUTORY PARTICULARS

         The particulars which are required to be included in the written
statement required by the Employment Protection (Consolidation) Act 1978 (as
amended) Sections 1 to 6 inclusive are set out in the Particulars.

25.      INTERPRETATION

         In this Agreement and unless the context otherwise requires:

         25.1    the paragraph headings are for reference purposes only and
shall not affect interpretation;

         25.2    unless otherwise stated a reference to a clause or sub-clause
is a reference to the clause or sub- clause so numbered to this Agreement;

         25.3    the express "the Company" shall be deemed to include any
subsidiary or  holding company of the Company as defined in the Companies Act
1985 Section 736 and "subsidiary company" shall have the meaning defined in the
Section;

         25.4    words importing one gender include the other genders and words
importing the singular include the plural and vice versa.

26.      NOTICES





                                       9
<PAGE>   10
         Notices may be given by either party by letter telegram or telex
addressed to the other party at (in the case of the Company) the Company's
registered office for the time being and (in the case of the Executive) the
Executive's last known address and any such notice given by letter shall be
deemed to have been given at the time at which the letter would be delivered in
the ordinary course of post.

27.      PREVIOUS CONTRACTS OF SERVICE

         This Agreement is in substitution for all previous contracts of
service between the Company and the Company's subsidiary or associated
companies and the Executive which shall be deemed to have been terminated by
mutual consent as from the date on which this Agreement commences.

28.      DISPUTES

         In the case of any dispute or difference arising between the parties
as to the construction of this Agreement or the rights, duties or obligations
on either party under the terms of this Agreement or any matter arising out of
or concerning the same or the Executive's employment under the terms of this
Agreement every such dispute and matter and difference shall be referred to a
single arbitrator in accordance with the provisions of the Arbitration Acts
1950 to 1979 or any statute for the time being replacing, extending or
modifying the same.

29.      DISCIPLINARY AND GRIEVANCE PROCEDURE

         29.1    If the Executive has a grievance relating to the Executive's
employment, the Executive should proceed in accordance with the Company's
grievance procedure which is set out in Appendix A but which does not form part
of the Executive's Terms and Conditions of Employment.

         29.2    The Company deals with disciplinary matters in accordance with
its disciplinary procedures which are set out in Appendix A but which do not
form part of the Executive's Terms and Conditions of Employment.

         29.3    Following any disciplinary procedure a complaint against the
Executive is upheld, the Company reserves the right to impose any one or more
of the following penalties on the Executive instead of a first or final warning
or dismissal with or without notice.

                 29.3.1   Demotion:  The Company may demote the Executive by
         notice in writing giving details of any consequential changes to the
         Executive's Terms and Conditions of Employment in particular the
         notice will give details of any reduction to the Executive's salary
         and/or loss of any benefits and/or privileges consequent upon such
         demotion.





                                       10
<PAGE>   11
                 29.3.2   Suspension:  The Company may suspend the Executive
         from work with or without notice in writing to this effect.  Such
         notice will specify the dates of the Executive's suspension, the
         conditions applicable to the Executive's suspension and the period of
         suspension.


SIGNED AS A DEED                           )
BY THE COMPANY                             )       /s/ NEIL A.M. CAMPBELL
ACTING BY ITS DIRECTOR AND SECRETARY       )

SIGNED AS A DEED                           )       /s/ GEORGE PURDIE
BY THE EXECUTIVE                           )





                                       11
<PAGE>   12
                                  APPENDIX A.

                     GRIEVANCE AND DISCIPLINARY PROCEDURES

1.       GRIEVANCE PROCEDURE.

         1.1     If you have any grievance relating to your employment you
should raise the matter initially with your chairman.  You may be required to
put any such grievance in writing.

         1.2     Having inquired into your grievance, your Chairman will
discuss it with you and will then notify you of his decision.

         1.3     If the decision of your Chairman is not acceptable, you may
then refer the matter in writing to the Company's Board ("the Board") whose
decision will be final and binding.

         1.4     When stating grievances, you may be accompanied by a fellow
employee of your choice.

2.       DISCIPLINARY PROCEDURES.

         2.1     The purposes of the disciplinary procedures is to ensure that
the Company behaves fairly in investigating and dealing with the allegations of
unacceptable conduct or performance.  Accordingly, the Company reserves the
right to depart from the precise requirements of its disciplinary procedure
where it is expedient to do so and where the resulting treatment of the
employee is no less fair.

         2.2     All cases of disciplinary action under these procedures will
be recorded and placed in the Company's records.  A copy of the Company's
disciplinary records concerning you will be supplied to you at your request.

         2.3     Offenses under the Company's procedures fall into 3 categories
namely:

                 o        misconduct
                 o        gross misconduct
                 o        incapability

         2.4     The following steps will be taken, as appropriate, in all
cases of disciplinary action:

                 2.4.1    Investigations:  No action will be taken before a
         proper investigation has been undertaken by the Company into the
         matter complained of.  If appropriate, the Company may by written
         notice suspend you while the investigation takes place.  If you are so
         suspended your contract of employment will continue together with all
         your rights under your contract will not be entitled to access in any
         of the Company's period of suspension, you will not be entitled to
         access to any of the Company's premises except at the prior request or
         with the prior consent of the Company and subject to such
<PAGE>   13
         conditions as the Company may impose.  The decision to suspend you
         will be notified to you by the Company and confirmed in writing.

                 2.4.2    Disciplinary Hearings:  If the Company decides to
         hold a disciplinary hearing about the matter complained of, you will
         be given details of the complaint against you at least three working
         days before the hearing.  At the hearing, you will be given an
         opportunity to state your case.  You may be accompanied by a fellow
         employee of your choice.  No disciplinary penalty will be imposed
         without a disciplinary hearing, but a hearing may proceed in your
         absence if you fail to turn up.

                 2.4.3    Appeals:  You have a right to appeal against any
         disciplinary decision to the Board.  You should inform the Board in
         writing of your wish to appeal within five working days of the date of
         the decision which forms the subject of your appeal.

                          The Chairman, as appropriate, will conduct an appeal
         hearing as soon as possible thereafter at which you will be given an
         opportunity to state your case and will be entitled to be accompanied
         by a fellow employee of your choice.

                          The decision of the Chairman, as appropriate, will be
         notified to you in writing and will be final and binding under this
         procedure.

         2.5     MISCONDUCT.

                 2.5.1    The following offenses are examples of misconduct:

                          o       Bad time keeping;
                          o       Unauthorized absence;
                          o       Minor damages to Company property;
                          o       Minor breach of Company rules;
                          o       Failure to observe Company procedures;
                          o       Abusive behavior;
                          o       Sexual or racial harassment;
                          o       Dishonesty of any kind;
                          o       Negligence not amount to gross negligence.

                          These offenses are not exclusive or exhaustive and
         offenses of a similar nature will be dealt with under this procedure.

                 2.5.2    The following procedure will apply in cases of
         alleged misconduct:

                          First Warning:  This will be given by your Chairman
         and may be oral or written according to the circumstances.  In either
         event, you will be





                                       2
<PAGE>   14
         advised that the warning constitutes the first formal state of this
         procedure.  If the warning is verbal, a note that such a warning has
         been given will be placed in the Company's records.

                          Final Warning:  This will be given by your Chairman
         and confirmed to you in writing.  This warning will state that, if you
         commit a further offense of misconduct during the period specified in
         it, your employment will be terminated.

                          Dismissal:  The decision to dismiss you will not be
         taken without reference to the Chairman and will be notified to you in
         writing.

         2.6     GROSS MISCONDUCT.

                 2.6.1    The following offenses are examples of gross
         misconduct:

                          o       Theft or unauthorized possession of any 
                                  property belonging to the Company or any
                                  employee;
                          o       Serious damage to Company property.
                          o       Falsification of reports, accounts, expense 
                                  claims or self-certification forms.
                          o       Refusal to carry out duties or reasonable 
                                  instructions.
                          o       Intoxication by reason of drink or drugs.
                          o       Having illegal drugs in your possession, 
                                  custody or control on the Company's premises.
                          o       Serious breach of Company rules.
                          o       Violent, dangerous or intimidatory conduct.
                          o       Sexual, racial or other harassment of a 
                                  fellow employee.
                          o       Gross negligence.

                          These examples are not exhaustive or exclusive and
                 offenses of a similar nature will be dealt with under this
                 procedure.

                 2.6.2    Gross misconduct will result in immediate dismissal
         without notice or pay in lieu of notice.  The decision to dismiss will
         not be taken without reference to the Chairman.  Dismissal will be
         notified to you in writing.

         2.7     INCAPABILITY.

                 2.7.1    The following are examples of incapability:

                          o       Poor performance;
                          o       Incompetence;





                                       3
<PAGE>   15
                          o       Unsuitability;
                          o       Lack of application.

                          These examples are not exhaustive or exclusive and
         instances of a similar nature will be dealt with under this procedure.

                 2.7.2    The following procedure will apply in cases of
         incapability:

                          First Warning:  This will be given by your Chairman
         and will be confirmed to you in writing.  This warning will specify
         the improvement required and will state that your work will be
         reviewed at the end of a specified period after the date of the
         warning.

                          Final Warning:  This will be given by your Chairman
         and confirmed to you in writing.  This warning will state that unless
         your work improves within a specified period after the date of the
         warning, your employment will be terminated.

                          Dismissal:  The decision to dismiss you will not be
         taken without reference to the Chairman.  Dismissal will be notified
         to you in writing.





                                       4

<PAGE>   1
                                                                 EXHIBIT 10.14
                     TERMS AND CONDITIONS OF EMPLOYMENT

                            P A R T I C U L A R S

PARTIES AND DEFINITIONS:

Statement of employment particulars required in accordance with the Employment
Protection (Consolidation) Act 1978 (as amended) Sections 1 to 6 inclusive:

<TABLE>
<S>      <C>                               <C>     <C>
1.       Name of the Company               :       Exploration Holdings Limited of 6 Pembroke Road, Sevenoaks, Kent TN13
                                                   IXR

2.       Name of the Executive             :       Neil Alexander Macleod Campbell of Tredigo, 6 St. John's Lane,
                                                   Hartley, Kent DA3 8ET

3.       Date of commencement
         of employment                     :

4.       Date of commencement of
         continuous employment             :

5.       Job title                         :       Director, Finance

6.       Salary                            :       L.124,000

7.       Annual Review Data                :       1st May

8.       Payment Date                      :       15th of each month

9.       Hours of work                     :       See clause 1.3

10.      Holiday                           :       25 working days per calendar year

11.      Place of work                     :       See clause 1.2

12.      Disciplinary rules                :       See clause 27

13.      Period of notice to be given      :       36 months
</TABLE>
<PAGE>   2
RECITAL:

The Company has agreed to employ the Executive and the Executive has agreed to
serve the Company from the date shown in the Particulars upon the following
terms.

1.       EMPLOYMENT AND DUTIES

         1.1     The Company will employ the Executive and the Executive will
serve the Company in accordance with the Job Title shown in the Particulars and
in such capacity shall perform the duties and exercise the powers which may
from time to time be assigned in or vested in the Executive by the board of
directors of the Company ("the Board") and shall in the discharge of such
duties and the exercise of such powers observe and comply with all resolutions
and directors from time to time made or given by the Board and shall devote
substantially the whole of the Executive's time and attention during normal
business hours (unless prevented by ill health) to the performance of the
Executive's duties under the terms of this Agreement.

         1.2     The duties of the Executive will be performed principally from
the Company's premises provided that:

                 1.2.1    the Executive shall travel to and from work at such
         locations both within and outside the United Kingdom as are required
         for the proper performance of the Executive's duties and

                 1.2.2    the Executive may be required to work at any of the
         Company's premises or at the premises of its customers' clients or
         suppliers on a temporary basis.

1.3      The Executive shall comply with the Company's normal hours of work for
office staff and shall perform any additional hours of work which are
reasonably required for the proper performance of the Executive's duties.  The
Executive shall not be entitled to any additional remuneration for work
performed outside the Company's normal hours of business.

1.4      The Company reserves the right to change the Company's premises and
will give the Executive at least one month's notice of the change and details
of its relocation policy where appropriate.  PROVIDED THAT

                 1.4.1    the relocation shall have no negative financial
         impact on the Executive

                 1.4.2    the relocation shall be within England.

2.       APPOINTMENT AS DIRECTOR





                                       2
<PAGE>   3
         During the term of this Agreement the Executive will if required by
the Board serve as a director of the Company and (if so required by the Board)
as a director or officer of any subsidiary or associated company of the Company
but shall not be entitled to any director's fees or other remuneration except
as provided in this Agreement in respect of any such directorship or office.

3.       TERM OF EMPLOYMENT

         The Executive shall continue to hold such office until this Agreement
is terminated by either Party giving to the other the period of notice provided
in the particulars.

4.       SALARY

         The Company shall during the continuance of the Executive's
appointment under the terms of this Agreement pay to the Executive the salary
shown in the Particulars by equal monthly installments on the Payment Date such
salary to be reviewed annually as at the Annual Review Date in each year.

5.       SALARY REVIEW

         5.1     The salary shall be reviewed with effect from the Annual
Review Date and each succeeding year during the continuance of this Agreement.

         5.2     Any change in salary will be made at the Company's absolute
discretion.

6.       EXPENSES

         In addition to the salary the Company shall pay to the Executive
during the continuance of the Executive's appointment under the terms of this
Agreement such travelling hotel and other expenses as may be properly incurred
by the Executive in the performance of the Executive's duties under the terms
of this Agreement subject to the presentation of all necessary vouchers or
receipts in respect of such expenses.

7.       PROVISION OF CAR

         During the Executive's employment under the terms of this Agreement,
the Company will supply the Executive with a car of a design and manufacturer
to be determined by the Company in accordance with the Company's executive car
policy from time to time in force and will maintain the car and pay all running
expenses in connection with the car including the Road Fund License and
insurance premiums and the cost of petrol consumed in the course of private
motoring.

8.       PROVISION OF MEDICAL INSURANCE





                                       3
<PAGE>   4
         During the Executive's employment under the term of this Agreement the
Company shall provide, at the Company's expense, medical insurance on an
international basis, including repatriation, for the Executive, the Executive's
spouse and the Executive's children subject to the children being under the age
of 18 or in full-time education.

9.       PERSONAL EFFECTS

         During the Executive's employment under the term of this Agreement the
Company shall indemnify the Executive against any loss of or damage of personal
effects (with the exception of a motor vehicle) whilst the Executive is at work
or travelling to and from work or required to stay away from the Executive's
normal residence for the purpose of or related to the business of the Company.

10.      HOLIDAYS

         The Executive shall in addition to the normal public bank holidays be
entitled to the holiday shown in the Particulars to be taken at such times as
shall be agreed between the Executive and the Board (and in termination of the
Executive's employment the Executive's entitlement to accrued holiday pay will
be in direct proportion to the length of the Executive's service during the
calendar year in which termination takes place).

11.      INCAPACITY

         11.1    In t he case of illness of the Executive or any other cause
incapacitating the Executive from duly attending to the Executive's duties, the
Executive shall receive the Executive's full salary during the first six months
or any shorter period AND if the Executive shall continue so incapacitated for
a longer period than 6 consecutive months or if the Executive shall be so
incapacitated at different times for more than 180 days in one period of 52
consecutive weeks then and in ether such case the Executive's employment shall
at the option of the Board be determined on one month's notice or such further
period of notice to which the Executive may be entitled by statute and all
arrears of salary and expenses shall be paid to the Executive.

         11.2    If the Executive is absent from work due to sickness or injury
which continues for more than 7 days (including weekends) the Executive may be
required by the Company to provide a medical certificate by the eight day of
sickness or injury.  Thereafter, medical certificates may be required by the
Company to cover any continued absence.

         11.3    Immediately following the Executive's return to work after a
period of absence which has previously been authorized by the Company, the
Executive is required to complete a self-certification form stating the dates
and reason for the Executive's absence including details of sickness on
non-working days as this information is required by the Company for calculating
statutory sick pay entitlement.  Self-certification forms will be retained in
the Company's records.





                                       4
<PAGE>   5
         11.4    The salary due to the Executive during the period of
incapacity will be inclusive of any Statutory Sick Pay to which the Executive
is entitled.

         11.5    The Company reserves the right for the Executive to be
examined at any time by an independent doctor at its expense and to cease
payment of any form of sick pay if it is advised by the doctor that the
Executive is fit to return to work.

12.      PENSION SCHEME

         During the Executive's employment under the terms of this Agreement
the Company will  make all necessary arrangements for the Executive to be a
member of whatever contributory pension scheme the Company may arrange or may
have arranged providing such benefits as have been agreed between the parties
and are set out in the documents constituting such scheme copies of which have
been or will be supplied to the Executive including membership of a permanent
health and injury scheme which shall provide, subject to insurers' conditions,
income in the Executive of not less that 66% of current net income in the event
o f illness or incapacity of more than 6 months or 6 months in any consecutive
period of 52 weeks.

13.      INCENTIVE SCHEME

         13.1    The Executive shall be entitled to participate in a Company
Executive Incentive Scheme ("the Scheme") which, subject to the conditions
below, shall give the Executive the potential to receive additional
remuneration of up to 50% of salary each year.

                 13.1.1   The Company shall define the Scheme annually on or
         before February 28th in each year for the Calendar year to which it
         relates.

                 13.1.2   The Scheme may take the form of a single Company goal
         for example profit performance or several individual targets such as
         productivity, etc., and may be varied each year.

                 13.1.3   Any remuneration earned under the Scheme for a
         particular year shall be paid on or before 1st June of the following
         calendar year.

14.      TERMINATION

         This Agreement shall be subject to summary termination by the Company
by notice in writing if the Executive shall have committed any serious breach
or continued in any persistent breach of the Executive's obligations under the
terms of this Agreement or shall have committed an act of bankruptcy or
compounded with the Executive's creditors generally.

15.      RESIGNATION FROM DIRECTORSHIP





                                       5
<PAGE>   6
         Upon the termination of this Agreement for whatever reason, the
Executive shall, upon the request of the Company, resign without claim for
compensation from office as a director of the Company and from all offices held
by the Executive in subsidiary or associated companies of the Company and in
the event of the Executive's failure to do so.  THE COMPANY IS IRREVOCABLY
AUTHORIZED to appoint some person in the Executive's name and on the
Executive's behalf to execute any documents and to do all things requisite to
give effect thereto PROVIDED THAT any such resignation shall be without
prejudice to any claims arising out of or in respect of the termination of the
Executive's employment by the Company.

16.      CONFIDENTIAL INFORMATION

         16.1    The Executive shall not, except as authorized or required by
the Executive's duties, reveal to any person or company any of the trade
secrets, secret or confidential operations or dealings or any information
concerning the organization business finances transactions or affairs of the
Company which may come to the Executive's knowledge during the Executive's
employment under the terms of this Agreement and shall keep with complete
secrecy all confidential information entrusted to the Executive and shall not
use or attempt to use any such information in any manner which may injure or
cause loss either directly or indirectly to the Company or the Company's
business or which may be likely to do so.

         16.2    If the Company shall have obtained trade secrets or other
confidential information from any third party under an agreement including
restrictions on disclosure known to the Executive, then the Executive will not,
without the consent of the Company at any time (whether during the Executive's
service or after the termination of the Executive's service), infringe such
restrictions.

         16.3    The Executive shall not during the continuance of this
Agreement make otherwise than for the benefit of the Company any notes or
memoranda relating to any matter within the scope of the business of the
Company or concerning any of the Company's dealings or affairs nor shall the
Executive either during the continuance of this Agreement or afterwards use or
permit to be used any such notes or memoranda otherwise than for the benefit of
the Company it being the intention of the parties that all such notes or
memoranda made by the Executive shall be the property of the Company and left
at the Company's registered office upon the termination of the Executive's
employment under the terms of this Agreement.

17.      RESTRICTIVE COVENANT

         17.1    The Executive AGREES that the Executive will not, following
the termination of this Agreement, for whatever cause:

                 17.1.1   within a period of twelve months thereafter seek to
         employ (in relation to any business which competes with the business
         of the Company as at the date of such termination) any person who was
         employed by the Company during a period of three months prior to the
         termination of this Agreement nor procure that any such





                                       6
<PAGE>   7
         period be employed or offered employment by any other person, firm or
         company and in relation to any such business.

                 17.1.2   at any time thereafter represent the Executive as
         being in any way connected with or interested in the Company or any
         business carried on by the Company.

         17.2    In this clause references to any act or conduct of the
Executive shall include such act or conduct whether done directly or indirectly
and whether along or jointly with or as employee of or agent for any other
person, firm or company.

18.      REASONABLENESS OF RESTRICTIONS

         The Executive ACKNOWLEDGES AND AGREES that:

         18.1    the direction, extent and application of each of the
restrictions set out in clause 17 are no greater than is reasonably necessary
for the protection of the legitimate interests of the Company in its business,
and

         18.2    if any such restriction shall be adjudged by any Court of
competent jurisdiction to be void or unenforceable but would be valid if part
of the wording of such restriction were deleted and/or the period of such
restriction or the area specified in such restriction was reduced then the
Executive agrees that such restriction shall apply and be binding on the
Executive as so amended and/or reduced.

19.      OTHER OCCUPATIONS

         The Executive shall not without the consent of the Company during the
continuance of this Agreement be engaged or interested either directly or
indirectly in any capacity in any trade business or occupation whatsoever other
than the business of the Company (save as the holder by way of investment only
of shares or securities issued by any company).  In this clause, the expression
"occupation" shall include any public or private appointment office or work
which in the reasonably opinion of the Company shall hinder or otherwise
interfere with the performance by the Executive of the Executive's duties under
this Agreement.

20.      INVENTIONS AND DISCOVERIES

         20.1    Any discovery or invention or secret process made or
discovered by the Executive (either alone or with any other person) while in
the service of the Company in connection with or in any way affecting or
relating to the business of the Company or any of the Company's subsidiary or
associated companies for the time being or in the opinion of the Board, capable
of being used or adapted for use therein or in connection therewith shall be
forthwith disclosed to the Company and shall be the absolute property of the
Company.





                                       7
<PAGE>   8
         20.2    The Executive shall if any whenever required so to do by the
Company at the expense of the Company apply or join with the Company in
applying for letters patent or other protection in any part of the world for
any such discovery invention or process and shall, at the expense of the
Company, executive or procure to be executed all instruments or documents
necessary for vesting letters patent or other protection when obtained and all
right, title and interest thereto in the Company absolutely or in such other
person as the Company may require.

         20.3    For the purpose of this clause THE EXECUTIVE IRREVOCABLY
APPOINTS the Company as the Executive's attorney in the Executive's name to
execute and do all documents and things which are required in order to give
effect to the provisions of this clause.

21.      COMPULSORY PAID LEAVE

         21.1    At any time after a notice has been served by either party
pursuant to clause 3 the Company may require the Executive to take paid leave
for the period (ore the balance of the period) of such notice and during such
period:

                 21.1.1   the Company shall have no obligation to provide work
         or to require the Executive to perform any duties;

                 21.1.2   the Executive shall receive the Executive's full
         salary and other benefits in accordance with the Agreement;

                 21.1.3   the provisions of clause 19 shall cease to apply but
         only in respect of any occupation which is not directly or indirectly
         concerned with any business which competes with any business of the
         Company PROVIDED THAT the Executive shall keep accurate records of any
         income or benefits received or receivable by him in respect of such
         occupation and shall notify the Company thereof and the Company may at
         its discretion deduct or set off all or part of such income or
         benefits from or against the salary and other benefits payable by the
         Company to the Executive during or in respect of such period.

22.      CONTINUATION OF PROVISIONS

         The expiration or determination of this Agreement howsoever arising
shall not affect such of the provisions of this Agreement as are expressed to
have effect or operate thereafter and shall be without prejudice to any right
of action already accrued to either party in respect of any breach of this
Agreement by the other party.

23.      COMPANY RECONSTRUCTION

         If before the termination of this Agreement:





                                       8
<PAGE>   9
         23.1    the employment of the Executive under the terms of this
Agreement shall be determined by reason of the winding up of the Company for
the purpose of the Company's reconstruction or amalgamation a nd the Company
shall procure that nay company or undertaking resulting from such
reconstruction or amalgamation shall offer to the Executive employment on terms
as to remuneration and otherwise not less favorable to the Executive than those
provided by this Agreement and for the residue of the period of this Agreement
or for such other period as may be mutually agreed; or

         23.2    the Company's holding company or any subsidiary thereof or of
the Company shall at any time during the continuance of this Agreement offer to
employ the Executive in the place of the Company on terms s to remuneration and
otherwise not less favorable to the Executive than those provided by this
Agreement and for the residue of the period of this Agreement and the Company
shall thereupon terminate this Agreement then in either such case the
termination of this Agreement shall be deemed not to be in breach of the
provisions of this Agreement and there will be no change to the date of
commencement of continuous employment shown in the Particulars and subject to
the appropriate statutory provisions the Executive shall have to claim against
the Company for damages or otherwise in connection with or arising from such
termination.

24.      STATUTORY PARTICULARS

         The particulars which are required to be included in the written
statement required by the Employment Protection (Consolidation) Act 1978 (as
amended) Sections 1 to 6 inclusive are set out in the Particulars.

25.      INTERPRETATION

         In this Agreement and unless the context otherwise requires:

         25.1    the paragraph headings are for reference purposes only and
shall not affect interpretation;

         25.2    unless otherwise stated a reference to a clause or sub-clause
is a reference to the clause or sub- clause so numbered to this Agreement;

         25.3    the express "the Company" shall be deemed to include any
subsidiary or  holding company of the Company as defined in the Companies Act
1985 Section 736 and "subsidiary company" shall have the meaning defined in the
Section;

         25.4    words importing one gender include the other genders and words
importing the singular include the plural and vice versa.

26.      NOTICES





                                       9
<PAGE>   10
         Notices may be given by either party by letter telegram or telex
addressed to the other party at (in the case of the Company) the Company's
registered office for the time being and (in the case of the Executive) the
Executive's last known address and any such notice given by letter shall be
deemed to have been given at the time at which the letter would be delivered in
the ordinary course of post.

27.      PREVIOUS CONTRACTS OF SERVICE

         This Agreement is in substitution for all previous contracts of
service between the Company and the Company's subsidiary or associated
companies and the Executive which shall be deemed to have been terminated by
mutual consent as from the date on which this Agreement commences.

28.      DISPUTES

         In the case of any dispute or difference arising between the parties
as to the construction of this Agreement or the rights, duties or obligations
on either party under the terms of this Agreement or any matter arising out of
or concerning the same or the Executive's employment under the terms of this
Agreement every such dispute and matter and difference shall be referred to a
single arbitrator in accordance with the provisions of the Arbitration Acts
1950 to 1979 or any statute for the time being replacing, extending or
modifying the same.

29.      DISCIPLINARY AND GRIEVANCE PROCEDURE

         29.1    If the Executive has a grievance relating to the Executive's
employment, the Executive should proceed in accordance with the Company's
grievance procedure which is set out in Appendix A but which does not form part
of the Executive's Terms and Conditions of Employment.

         29.2    The Company deals with disciplinary matters in accordance with
its disciplinary procedures which are set out in Appendix A but which do not
form part of the Executive's Terms and Conditions of Employment.

         29.3    Following any disciplinary procedure a complaint against the
Executive is upheld, the Company reserves the right to impose any one or more
of the following penalties on the Executive instead of a first or final warning
or dismissal with or without notice.

                 29.3.1   Demotion:  The Company may demote the Executive by
         notice in writing giving details of any consequential changes to the
         Executive's Terms and Conditions of Employment in particular the
         notice will give details of any reduction to the Executive's salary
         and/or loss of any benefits and/or privileges consequent upon such
         demotion.





                                       10
<PAGE>   11
                 29.3.2   Suspension:  The Company may suspend the Executive
         from work with or without notice in writing to this effect.  Such
         notice will specify the dates of the Executive's suspension, the
         conditions applicable to the Executive's suspension and the period of
         suspension.


SIGNED AS A DEED                           )
BY THE COMPANY                             )       /s/ GERALD M. HARRISON
ACTING BY ITS DIRECTOR                     )

SIGNED AS A DEED                           )       /s/ NEIL A.M. CAMPBELL
BY THE EXECUTIVE                           )





                                       11
<PAGE>   12
                                  APPENDIX A.

                     GRIEVANCE AND DISCIPLINARY PROCEDURES

1.       GRIEVANCE PROCEDURE.

         1.1     If you have any grievance relating to your employment you
should raise the matter initially with your chairman.  You may be required to
put any such grievance in writing.

         1.2     Having inquired into your grievance, your Chairman will
discuss it with you and will then notify you of his decision.

         1.3     If the decision of your Chairman is not acceptable, you may
then refer the matter in writing to the Company's Board ("the Board") whose
decision will be final and binding.

         1.4     When stating grievances, you may be accompanied by a fellow
employee of your choice.

2.       DISCIPLINARY PROCEDURES.

         2.1     The purposes of the disciplinary procedures is to ensure that
the Company behaves fairly in investigating and dealing with the allegations of
unacceptable conduct or performance.  Accordingly, the Company reserves the
right to depart from the precise requirements of its disciplinary procedure
where it is expedient to do so and where the resulting treatment of the
employee is no less fair.

         2.2     All cases of disciplinary action under these procedures will
be recorded and placed in the Company's records.  A copy of the Company's
disciplinary records concerning you will be supplied to you at your request.

         2.3     Offenses under the Company's procedures fall into 3 categories
namely:

                 o        misconduct
                 o        gross misconduct
                 o        incapability

         2.4     The following steps will be taken, as appropriate, in all
cases of disciplinary action:

                 2.4.1    Investigations:  No action will be taken before a
         proper investigation has been undertaken by the Company into the
         matter complained of.  If appropriate, the Company may by written
         notice suspend you while the investigation takes place.  If you are so
         suspended your contract of employment will continue together with all
         your rights under your contract will not be entitled to access in any
         of the Company's period of suspension, you will not be entitled to
         access to any of the Company's premises except at the prior request or
         with the prior consent of the Company and subject to such
<PAGE>   13
         conditions as the Company may impose.  The decision to suspend you
         will be notified to you by the Company and confirmed in writing.

                 2.4.2    Disciplinary Hearings:  If the Company decides to
         hold a disciplinary hearing about the matter complained of, you will
         be given details of the complaint against you at least three working
         days before the hearing.  At the hearing, you will be given an
         opportunity to state your case.  You may be accompanied by a fellow
         employee of your choice.  No disciplinary penalty will be imposed
         without a disciplinary hearing, but a hearing may proceed in your
         absence if you fail to turn up.

                 2.4.3    Appeals:  You have a right to appeal against any
         disciplinary decision to the Board.  You should inform the Board in
         writing of your wish to appeal within five working days of the date of
         the decision which forms the subject of your appeal.

                          The Chairman, as appropriate, will conduct an appeal
         hearing as soon as possible thereafter at which you will be given an
         opportunity to state your case and will be entitled to be accompanied
         by a fellow employee of your choice.

                          The decision of the Chairman, as appropriate, will be
         notified to you in writing and will be final and binding under this
         procedure.

         2.5     MISCONDUCT.

                 2.5.1    The following offenses are examples of misconduct:

                          o       Bad time keeping;
                          o       Unauthorized absence;
                          o       Minor damages to Company property;
                          o       Minor breach of Company rules;
                          o       Failure to observe Company procedures;
                          o       Abusive behavior;
                          o       Sexual or racial harassment;
                          o       Dishonesty of any kind;
                          o       Negligence not amount to gross negligence.

                          These offenses are not exclusive or exhaustive and
         offenses of a similar nature will be dealt with under this procedure.

                 2.5.2    The following procedure will apply in cases of
         alleged misconduct:

                          First Warning:  This will be given by your Chairman
         and may be oral or written according to the circumstances.  In either
         event, you will be





                                       2
<PAGE>   14
         advised that the warning constitutes the first formal state of this
         procedure.  If the warning is verbal, a note that such a warning has
         been given will be placed in the Company's records.

                          Final Warning:  This will be given by your Chairman
         and confirmed to you in writing.  This warning will state that, if you
         commit a further offense of misconduct during the period specified in
         it, your employment will be terminated.

                          Dismissal:  The decision to dismiss you will not be
         taken without reference to the Chairman and will be notified to you in
         writing.

         2.6     GROSS MISCONDUCT.

                 2.6.1    The following offenses are examples of gross
         misconduct:

                          o       Theft or unauthorized possession of any
                                  property belonging to the Company or any
                                  employee;
                          o       Serious damage to Company property.
                          o       Falsification of reports, accounts, expense
                                  claims or self-certification forms.
                          o       Refusal to carry out duties or reasonable
                                  instructions.
                          o       Intoxication by reason of drink or drugs.
                          o       Having illegal drugs in your possession,
                                  custody or control on the Company's premises.
                          o       Serious breach of Company rules.
                          o       Violent, dangerous or intimidatory conduct.
                          o       Sexual, racial or other harassment of a
                                  fellow employee.
                          o       Gross negligence.

                          These examples are not exhaustive or exclusive and
                 offenses of a similar nature will be dealt with under this
                 procedure.

                 2.6.2    Gross misconduct will result in immediate dismissal
         without notice or pay in lieu of notice.  The decision to dismiss will
         not be taken without reference to the Chairman.  Dismissal will be
         notified to you in writing.

         2.7     INCAPABILITY.

                 2.7.1    The following are examples of incapability:

                          o       Poor performance;
                          o       Incompetence;





                                       3
<PAGE>   15
                          o       Unsuitability;
                          o       Lack of application.

                          These examples are not exhaustive or exclusive and
         instances of a similar nature will be dealt with under this procedure.

                 2.7.2    The following procedure will apply in cases of
         incapability:

                          First Warning:  This will be given by your Chairman
         and will be confirmed to you in writing.  This warning will specify
         the improvement required and will state that your work will be
         reviewed at the end of a specified period after the date of the
         warning.

                          Final Warning:  This will be given by your Chairman
         and confirmed to you in writing.  This warning will state that unless
         your work improves within a specified period after the date of the
         warning, your employment will be terminated.

                          Dismissal:  The decision to dismiss you will not be
         taken without reference to the Chairman.  Dismissal will be notified
         to you in writing.





                                       4

<PAGE>   1
                                                                 EXHIBIT 10.15
                       EMPLOYMENT AGREEMENT AMENDMENT

         This Employment Agreement Amendment ("Amendment") is entered into this
____ day of ____________, 1997, by and between Exploration Holdings Limited
(the "Company") and __________________ ("Executive").

                                    Recitals

         WHEREAS, the Company and Executive have previously entered into a
Service Agreement for Senior Directors relating to the employment of Executive
by the Company, which has been amended by an Employment Agreement Amendment
dated July 3, 1996 (as so amended, the "Agreement");

         WHEREAS, Executive and the Company have agreed to enter into this
Amendment and hereby amend certain terms of the Agreement as set forth herein;

                                   Agreement

         NOW, THEREFORE, for and in consideration of the mutual promises and
covenants contained herein, the parties hereby agree as follows:

         1.      Executive and the Company hereby agree that the warrants to
purchase up to 5,555 ordinary shares of US$0.001 of Energy Research
International, a Cayman Islands corporation and the parent corporation of the
Company, at a price of US$300.03 per ordinary share, granted to the Executive
on July 3, 1996 pursuant to the Agreement are hereby cancelled.

         2.      Executive is hereby granted stock options to purchase up to
75,000 shares of Common Stock, $0.01 par value per share, of Eagle Geophysical,
Inc., a Delaware corporation and the ultimate parent corporation of the Company
("Eagle"), pursuant to Eagle's stock option plan at a price per share equal to
the initial public offering price of such stock pursuant to Eagle's initial
public offering being consummated on or about the date hereof.  Such stock
options shall vest in cumulative installments of one-third of the total shares
subject thereto on each of the first, second and third anniversaries of the
date hereof and will expire ten years from the date of grant or such earlier
date as may be specified pursuant to Eagle's stock option plan.  In addition,
any such options that are not vested as of any date on which the Company
terminates the Executive's employment not in accordance with this Agreement
shall become fully vested on the date of such termination.

         3.      The annual review date set forth in paragraph 7 of the Terms
and Conditions of Employment, Particulars, is hereby amended to be each
subsequent anniversary of the date hereof.

         4.      Subsection 1.4.2 of the Agreement is hereby amended to read in
its entirety as follows:

         "1.4.2           the relocation shall be within England or the United
                          States of America; provided, however, any such
                          relocation to the United States shall be only
<PAGE>   2
                          with the consent of Executive, which consent may not
                          be unreasonably withheld by the Executive."


         5.      Subsection 5.2 of the Agreement is hereby amended to read in
its entirety as follows:

         "5.2    Any change in salary will be made at the Company's absolute
                 discretion; provided, however in no event may the salary be
                 reduced below the Salary reflected as item 6 of the Terms &
                 Conditions of Employment attached as a part of the Agreement."

         6.      The Company Executive Incentive Scheme contemplated in
paragraph 13.1 of the Agreement is hereby amended for the calendar year ending
December 31, 1997 to provide that the Executive shall be entitled to receive an
amount equal to 50% of his base salary for such year under the Scheme if and
only if the Operating Profit Margin (as defined in Paragraph 13.2 of the
Agreement) of the Marine Business (as defined in Paragraph 13.2 of the
Agreement) for such year equals or exceeds 24% of revenues from the Marine
Business.

         7.      Section 13 of the Agreement is hereby amended by adding a new
paragraph 13.2 thereto as follows:

13.2     Additional Incentive Bonus

         13.2.1           Additional Incentive Bonus.  The Executive shall
                          receive additional incentive bonuses, if earned,with
                          respect to the fiscal years ending during the Term
                          pursuant to Subsection 13.2.3 and/or 13.2.4 (each an
                          "Additional Incentive Bonus"); provided, however,
                          that no Additional Incentive Bonus for a fiscal year
                          shall be payable if the Net After-Tax Profits (as
                          hereinafter defined) for such fiscal year do not
                          exceed Base Profits (as hereinafter defined).

         13.2.2           Definitions.

                          "Base Profits" shall mean 5% of gross revenues from
                          the Marine Business.

                          "Chief Financial Officer" means the chief financial
                          officer of Eagle Geophysical.

                          "Eagle Geophysical" means Eagle Geophysical, Inc., a
                          Delaware corporation and the indirect parent
                          corporation of the Company.

                          "Marine Business" means the marine seismic data
                          acquisition business of the Company and its wholly
                          owned subsidiaries and of any other company that is a
                          direct or indirect wholly owned subsidiary of Eagle
                          Geophysical.
<PAGE>   3
                          "Net After-Tax Profits" shall, for the purposes
                          hereof, mean the amount of net profits of the Marine
                          Business calculated by the Chief Financial Officer
                          applying U.S. GAAP and such other accounting
                          principles and assumptions as may be reasonable and
                          taking into account expenses attributable to
                          allocable overhead (based on revenues) from all other
                          companies controlled by or under common control with
                          the Company engaged in the Marine Business and of
                          such companies' parent corporation(s), and
                          subtracting therefrom all income tax liabilities
                          attributable to the Marine Business.

                          "Operating Profit Margin" means the amount of revenue
                          less cost of sales of the Marine Business calculated
                          by the Chief Financial Officer applying U.S. GAAP and
                          such other accounting principles and assumptions as
                          may be reasonable.

         13.2.3           Applicable Percentage Bonus.  If Net After-Tax
                          Profits for a fiscal year exceed Base Profits for
                          such fiscal year, the Executive shall receive an
                          Additional Incentive Bonus (in addition to any
                          Additional Incentive Bonus pursuant to Subsection
                          13.2.4) equal to the Applicable Percentage set forth
                          in the table below multiplied by the difference
                          between actual Net After- Tax Profits and Base
                          Profits.

                              Net After-Tax Profits       
                           (percent of gross revenues)     Applicable Percentage
                           ---------------------------     ---------------------
                                                          
                          greater than 5%, but less than           2.0%
                                  or equal to 6%          

                          greater than 6%, but less than           2.5%
                                  or equal to 7%          
                                                          
                                 greater than 7%                   3.0%

         13.2.4           Significant Increase in Revenues Bonus.  If Net
                          After-Tax Profits for a fiscal year after 1997 exceed
                          Base Profits for such fiscal year, and if gross
                          revenues of the Marine Business for such fiscal year
                          increase by an amount of 20% or more as compared to
                          the gross revenues of the Marine Business for the
                          previous fiscal year, the Executive shall receive an
                          Additional Incentive Bonus equal to 3% multiplied by
                          the excess, if any, of the Net After-Tax Profits for
                          such fiscal year over the greater of (i) the Net
                          After-Tax Profits for the prior fiscal year or (ii)
                          Base Profits for the prior fiscal year.

         13.2.5           Payment of Additional Incentive Bonus.  The Chief
                          Financial Officer shall calculate the Net After-Tax
                          Profits, and any Additional Incentive Bonus payable
                          to the Executive in connection therewith, shall
                          certify such calculations and shall deliver such
                          calculations to the Executive as soon as reasonably
                          practicable after the end of each fiscal year, but in
                          any event within seventy-five (75) days following the
                          end of such fiscal year.  Any





                                       3
<PAGE>   4
                          Additional Incentive Bonus payable hereunder shall be
                          paid by the Company to the Executive within seven (7)
                          days of delivery of such calculations by the Chief
                          Financial Officer and in any event within eighty-two
                          (82) days following the end of the applicable fiscal
                          year.

         8.      Section 28 of the Agreement is hereby amended to read in its
entirety as follows:

"28.     DISPUTES

28.1             Arbitration.  Any dispute, difference or question ("Dispute")
                 between Executive and the Company ("Disputing Parties"),
                 arising with respect to the Agreement or Executive's
                 employment under the Agreement that is not resolved promptly
                 by the Disputing Parties shall be resolved by binding
                 arbitration as follows.  In the event the Parties are unable
                 to resolve the Dispute within 14 days following written notice
                 from one Disputing Party to the other setting forth the basis
                 of the Dispute, then either Disputing Party may request that
                 the Dispute be settled by binding arbitration by an arbitrator
                 mutually acceptable to the Disputing Parties in an arbitration
                 proceeding conducted in Houston, Texas in accordance with the
                 rules existing at the date hereof of the American Arbitration
                 Association.  If the Disputing Parties hereto cannot agree on
                 an arbitrator within ten (10) business days of the initiation
                 of the arbitration proceeding, an arbitrator shall be selected
                 for the Disputing Parties by the American Arbitration
                 Association.  The Disputing Parties shall use their reasonable
                 best efforts to have the arbitration proceeding concluded and
                 a judgment rendered by the arbitrator within forty (40)
                 business days of the initiation of the arbitration proceeding.
                 The decision of such arbitrator shall be final, and judgment
                 upon the award rendered by the arbitration may be entered in
                 any court having jurisdiction thereof, and the costs
                 (including, without limitation, reasonable fees and expenses
                 of counsel and experts for the Disputing Parties) of such
                 arbitration (including the costs to enforce or preserve the
                 rights awarded in the arbitration) shall be borne by the
                 Disputing Party whom the decision of the arbitrator is
                 against.  If the decision of the arbitrator is not clearly
                 against one of the Disputing Parties or the decisions of the
                 arbitrator is against more than one Disputing Party on one or
                 more issues, the costs of such arbitration shall be borne
                 equally by the Disputing Parties.

28.2             Consent to Jurisdiction; Venue.  The parties hereto agree that
                 all actions relating to the enforcement of this Section or any
                 award rendered hereunder, and over which the United States
                 federal courts have subject matter jurisdiction, shall be
                 litigated, if at all, exclusively in the United States
                 District Court for the Southern District of Texas, Houston
                 Division, and, if necessary, the corresponding appellate
                 courts.  The parties further agree that all actions relating
                 to the enforcement of this Section or any award rendered
                 hereunder, and over which the United States federal courts do
                 not have subject matter jurisdiction, shall be litigated, if
                 at all, exclusively in the Courts of the State of Texas, in
                 Harris County, and, if necessary, the corresponding appellate
                 courts.  Each party hereto hereby submits itself to the
                 personal jurisdiction of, and consents to venue in, any such
                 court, and hereby waives any claim it may otherwise have that
                 such court lacks personal





                                       4
<PAGE>   5
                 jurisdiction over it, or that such court is an inconvenient
                 forum, with respect to any such matter or proceeding.  Each
                 party hereto further agrees to voluntarily appear and to enter
                 a general appearance in any such proceeding which is brought
                 in any such court.  Executive hereby appoints Carolyn Campbell
                 and/or Griggs & Harrison, P.C. of Houston, Texas as its agent
                 for service of process in any such matter or proceeding."

28.3             Governing Law.  This Agreement shall be governed by, and
                 interpreted in accordance with, the laws of the United
                 Kingdom, without regard to the conflicts of laws provisions
                 thereunder.

         9.      Except as specifically amended hereby, the terms and
provisions of the Agreement shall continue in full force and effect.


SIGNED as a Deed         )
by the Company           )                  
acting by its            )                  -----------------------------------
              -----------
                                            -----------------------------------


SIGNED as a Deed         )
by the Executive         )
                                            -----------------------------------






                                       5

<PAGE>   1

                                                                           10.17

                              EMPLOYMENT AGREEMENT


         THIS EMPLOYMENT AGREEMENT (this "Agreement"), is entered into as of
April 24, 1997, by and between  EAGLE GEOPHYSICAL, INC., a Delaware corporation
(the "Company"), and RICHARD W. MCNAIRY (the "Executive").

         The Company desires to employ the Executive and the Executive desires
to accept employment with the Company, on the terms and conditions of this
Agreement.

         Accordingly, the parties agree as follows:

         1.      Employment Duties and Acceptance.

                 1.1      Employment by the Company; Duties.  The Company
hereby agrees to employ the Executive for a term commencing on April 24 1997,
and expiring at the end of the day on April 23, 1999 (such date, or later date
to which this Agreement is extended in accordance with the terms hereof, the
"Termination Date"), unless earlier terminated as provided in Section 4 or
unless extended as provided herein (the "Term").  The Term shall be
automatically extended commencing on the Termination Date and on each
Termination Date thereafter (each such date being a "Renewal Date"), so as to
terminate one (1) year from such Renewal Date, unless and until at least ninety
(90) days prior to a Renewal Date either party hereto gives written notice to
the other that the Term should not be further extended, in which event the
Termination Date shall be the Renewal Date following such notice.  During the
Term, the Executive shall serve in the capacity of Vice President and Chief
Financial Officer of the Company and shall also serve in those offices and
directorships of subsidiary corporations or entities of the Company to which he
may from time to time be appointed or elected. During the Term, the Executive
shall devote all reasonable efforts and all of his business time and services
to the Company, subject to the direction of the Board of Directors of the
Company (the "Board").  The Executive shall not engage in any other business
activities except for passive investments in corporations or partnerships not
engaged in the Company Business (as hereinafter defined) pursuant to Section 3
hereof.

                 1.2      Acceptance of Employment by the Executive. The
Executive hereby accepts such employment and shall render the services and
perform the duties described above.

         2.      Compensation and Other Benefits.

                 2.1      Annual Salary. The Company shall pay to the Executive
an annual salary at a rate of not less than one hundred fifty thousand dollars
($150,000) per year (the "Annual Salary"), subject to increase at the sole
discretion of the Board.  The
<PAGE>   2
Annual Salary shall be payable in accordance with the payroll policies of the
Company as from time to time in effect, but in no event less frequently than
once each month, less such deductions as shall be required to be withheld by
applicable law and regulations.

                 2.2      Bonuses. The Executive may receive, at the sole
discretion of the Board, an incentive bonus with respect to the fiscal years
ending during the Term (the "Incentive Bonus"), equal to one-third of the
Annual Salary for such fiscal year, unless otherwise increased by the Board.
Any Incentive Bonus payable hereunder shall be paid by the Company to the
Executive within ninety (90) days following the end of the applicable fiscal
year.

                 2.3      Grant of Option. The Company agrees to grant the
Executive, pursuant to the terms of the Company's Option Plan (the "Option
Plan") created in connection with the initial public offering (the "IPO") of
the Company's common stock, options to acquire twenty five thousand (25,000)
shares of the Company's common stock (the "Options"), at an exercise price
equal to the IPO issue price.  The Options shall vest over a period of three
years, with Options to acquire 8,334 shares vesting one year from the date
hereof, Options to acquire 8,333 shares vesting two years from the date hereof,
and Options to acquire 8,333 shares vesting three years from the date hereof,
subject to the terms of the Option Plan.  The Company agrees to use all
reasonable efforts, consistent with the foregoing, to ensure that the Options
meet all requirements for treatment as Incentive Stock Options under the
Internal Revenue Code of 1986, as amended, and that the grant of the Options
meets the requirements of Rule 16b-3, promulgated under Section 16 of the
Securities Exchange Act of 1934, as amended (the "Act").

                 2.4      Vacation Policy. The Executive shall be entitled to a
paid vacation of three weeks during each year of the Term, commencing six
months after the date hereof.

                 2.5      Participation in Employee Benefit Plans. The Company
agrees to permit the Executive during the Term, if and to the extent eligible,
to participate in any group life, hospitalization or disability insurance plan,
health program, pension plan, similar benefit plan or other so-called "fringe
benefits" of the Company (collectively, "Benefits") which may be available to
other senior executives of the Company on terms no less favorable to the
Executive than the terms offered to such other executives. The Company agrees
to use its best efforts to obtain immediate coverage for the Executive upon the
commencement of the Term under its existing or newly adopted medical expense
and hospitalization plan for employees without premium surcharge and without
exclusions for disclosed preexisting conditions. The Executive shall cooperate
with the Company in applying for such coverage, including submitting to a
physical exam and providing all relevant health and personal data.
<PAGE>   3
                 2.6      General Business Expenses. The Company shall pay or
reimburse the Executive for all expenses reasonably and necessarily incurred by
the Executive during the Term in the performance of the Executive's services
under this Agreement. Such payment shall be made upon presentation of such
documentation as the Company customarily requires of its senior executive
employees prior to making such payments or reimbursements.

                 2.7      Company Car and Cellular Telephone. The Company shall
pay the Executive a car allowance of six hundred and no/100 dollars ($600.00)
per month, which the Executive may apply, in his discretion, to the cost
associated with purchasing or leasing, insuring, operating and maintaining an
automobile of the Executive's choice.  The Executive may use the automobile for
personal as well as business purposes.  The Company shall also furnish the
Executive with a cellular telephone of his choice and the Company shall pay all
charges in connection with the use thereof, other than charges for calls not
related to the Executive's duties hereunder.

         3.      Non-Competition, Confidentiality and Company Property.

                 3.1      Covenants Against Competition.  The Executive
acknowledges that (i) the Company is currently engaged in the business of
owning, managing and operating seismic data acquisition equipment and hiring
and managing crews to operate such equipment, which equipment and crews are
contracted or hired for the purpose of performing geological surveys and
acquiring seismic data onshore and offshore (the "Company Business"); (ii) his
work for the Company will give him access to trade secrets of and confidential
information concerning the Company; and (iii) the agreements and covenants
contained in this Agreement are essential to protect the business and goodwill
of the Company.  Accordingly, the Executive covenants and agrees as follows:

                          3.1.1   Non-Compete.  As an independent covenant, and
in order to enforce the provisions of Sections 3.1.3 and 3.1.5 hereof and the
other provisions of this Agreement, the Executive agrees that he shall not
during the Restricted Period (as hereinafter defined) within a fifty (50) mile
radius of the Company's principal office, directly or indirectly (except in the
Executive's capacity as an officer of the Company), (i) engage or participate
in the Company Business; (ii) enter the employ of, or render any other services
to, any person engaged in the Company Business except as permitted hereunder;
or (iii) become interested in any such person in any capacity, including,
without limitation, as an individual, partner, shareholder, lender, officer,
director, principal, agent or trustee except as permitted hereunder; provided,
however, that the Executive may own, directly or indirectly, solely as an
investment, securities of any person traded on any national securities exchange
or listed on the National Association of Securities Dealers Automated Quotation
System if the Executive is not a controlling person of, or a member of a group
which controls, such person and the Executive does not,
<PAGE>   4
directly or indirectly, own 5% or more of any class of equity securities, or
securities convertible into or exercisable or exchangeable for 5% or more of
any class of equity securities, of such person.  As used herein, the
"Restricted Period" shall mean a period commencing on the date hereof and
terminating upon the first to occur of (a) the date on which the Company
terminates or is deemed to terminate the Executive's employment without Cause
(as hereinafter defined), (b) the date the Executive terminates or is deemed to
terminate his employment pursuant to Section 4.6 hereof or (c) the date of
termination of this Agreement; provided, however, that if the Company shall
have terminated the Executive's employment for Cause and such Cause in fact
exists or if the Executive shall have terminated his employment with the
Company in breach of the terms of this Agreement, the Restricted Period shall
end one (1) year following the termination of the Executive's employment
hereunder.

                          3.1.2   Customers.  As an independent covenant, the
Executive also agrees to refrain during his employment by the Company, and in
the event of the termination of his employment for any reason, for one year
thereafter, without written permission from the Company, from diverting,
taking, soliciting and/or accepting on his own behalf or on the behalf of
another person, firm, or company, the business of any past or present customer
of the Company, its divisions, subsidiaries and/or other affiliated entities,
or any identified prospective or potential customer of the Company, its
divisions, subsidiaries and/or affiliated entities, whose identity became known
to the Executive through his employment by the Company.

                          3.1.3   Confidential Information.

                               3.1.3.1  The Executive acknowledges that the
Company has a legitimate and continuing proprietary interest in the protection
of its confidential information and that it has invested substantial sums and
will continue to invest substantial sums to develop, maintain and protect
confidential information.  The Company agrees to provide the Executive access
to confidential information in conjunction with the Executive's duties,
including, without limitation, information of a technical and business nature
regarding the Company's past, current or anticipated business that may
encompass financial information, financial figures, trade secrets, customer
lists, details of client or consultant contracts, pricing policies, operational
methods, marketing plans or strategies, product development techniques or
plans, business acquisition plans, Company employee information, organizational
charts, new personnel acquisition plans, technical processes, designs and
design projects, inventions and research projects, ideas, discoveries,
inventions, improvements, trade secrets, design specifications, writings and
other works of authorship.  In exchange, as an independent covenant, the
Executive agrees not to make any unauthorized use, publication, or disclosure,
during or subsequent to his employment by the Company, of any Intellectual
Property of a confidential or trade secret nature, generated or
<PAGE>   5
acquired by him during the course of his employment, except to the extent that
the disclosure of Intellectual Property Information is necessary to fulfill his
responsibilities as an employee of the Company.  The Executive understands that
confidential matters and trade secrets include information not generally known
by or available to the public about or belonging to the Company, its divisions,
subsidiaries, and related affiliates, or belonging to other companies to whom
the Company, its divisions, subsidiaries, and related affiliates, may have an
obligation to maintain information in confidence, and that authorization for
public disclosure may only be obtained through the Company's written consent.

                               3.1.3.2  The Executive further agrees not to
disclose to the Company, or induce any personnel of the Company to use, any
confidential information, trade secret, or confidential material belonging to
others.

                               3.1.3.3  The Executive agrees that the
covenants set forth in Sections 3.1.3.1 and 3.1.3.2 are independent covenants
and indefinite obligations binding upon the Executive both during and after the
termination of the Executive's relationship with the Company.

                          3.1.4   Property of the Company.  All memoranda,
notes, lists, records, engineering drawings, technical specifications and
related documents and other documents or papers (and all copies thereof)
relating to the Company, including such items stored in computer memories,
microfiche or by any other means, made or compiled by or on behalf of the
Executive after the date hereof, or made available to the Executive after the
date hereof relating to the Company, its affiliates or any entity which may
hereafter become an affiliate thereof, shall be the property of the Company,
and shall be delivered to the Company promptly upon the termination of the
Executive's employment with the Company or at any other time upon request;
provided, however, that the Executive's address books, diaries, chronological
correspondence files and rolodex files shall be deemed to be property of the
Executive.

                          3.1.5   Original Material.  The Executive agrees that
any inventions, discoveries, improvements, ideas, concepts or original works of
authorship relating directly to the Company Business, including without
limitation information of a technical or business nature such as ideas,
discoveries, designs, inventions, improvements, trade secrets, know-how,
manufacturing processes, product formulae, design specifications, writings and
other works of authorship, computer programs, financial figures, marketing
plans, customer lists and data, business plans or methods and the like, which
relate in any manner to the actual or anticipated business or the actual or
anticipated areas of research and development of the Company and its divisions,
subsidiaries, affiliates, or related entities, whether or not protectable by
patent or copyright, that have been originated, developed or
<PAGE>   6
reduced to practice by the Executive alone or jointly with others during the
Executive's employment with the Company shall be the property of and belong
exclusively to the Company.  The Executive shall promptly and fully disclose to
the Company the origination or development by the Executive of any such
material and shall provide the Company with any information that it may
reasonably request about such material.  Either during the subsequent to the
Executive's employment, upon the request and at the expense of the Company or
its nominee, and for no remuneration in addition to that due the Executive
pursuant to his employment by the Company, but at no expense to him, the
Executive agrees to execute, acknowledge, and deliver to the Company or its
attorneys any and all instruments which, in the judgment of the Company or its
attorneys, may be necessary or desirable to secure or maintain for the benefit
of the Company adequate patent, copyright, and other property rights in the
United States and foreign countries with respect to any such inventions,
improvements, ideas, concepts, or original works of authorship embraced within
this Agreement.

                          3.1.6   Employees of the Company and its Affiliates.
As an independent covenant, the Executive agrees to refrain during his
employment by the Company, and in the event of the termination of his
employment for any reason for a period of one year thereafter, from inducing or
attempting to influence any employee of the Company, its divisions,
subsidiaries and/or affiliated entities to terminate his employment.

                          3.1.7   Company's Interest.  The Executive further
agrees that these covenants are made to protect the legitimate business
interests of the Company, including interests in the Company's property
described in and pursuant to Section 3.1.4 and Section 3.1.5, and not to
restrict his mobility or to prevent him from utilizing his general technical
skills.  The Executive understands as a part of these covenants that the
Company intends to exercise whatever legal recourse against him for any breach
of this Agreement and, in particular, for any breach of these covenants.

                 3.2      Rights and Remedies Upon Breach.  If the Executive
breaches, or threatens to commit a breach of, any of the provisions contained
in Section 3.1 of this Agreement (the "Restrictive Covenants"), the Company
shall have the following rights and remedies, each of which rights and remedies
shall be independent of the others and severally enforceable, and each of which
is in addition to, and not in lieu of, any other rights and remedies available
to the Company under law or in equity:

                          3.2.1   Specific Performance.  The right and remedy
to have the Restrictive Covenants specifically enforced by any court of
competent jurisdiction, it being agreed that any breach or threatened breach of
the Restrictive Covenants would cause irreparable injury to the Company and
that money damages would not provide an adequate remedy to the Company.
<PAGE>   7
                          3.2.2    Accounting.  The right and remedy to 
require the Executive to account for and pay over to the Company all
compensation, profits, monies, accruals, increments or other benefits derived
or received by the Executive as the result of any action constituting a breach
of the Restrictive Covenants.

                 3.3      Severability of Covenants.  The Executive
acknowledges and agrees that the Restrictive Covenants are reasonable and valid
in duration and geographical scope and in all other respects.  If any court
determines that any of the Restrictive Covenants, or any part thereof, is
invalid or unenforceable, the remainder of the Restrictive Covenants shall not
thereby be affected and shall be given full effect without regard to the
invalid portions.

                 3.4      Court Review.  If any court determines that any of
the Restrictive Covenants, or any part thereof, is unenforceable because of the
duration or geographical scope of, or scope of activities restrained by, such
provision, such court shall have the power to reduce the duration or scope of
such provision, as the case may be, and, in its reduced form, such provision
shall then be enforceable.

                 3.5      Enforceability in Jurisdictions.  The Company and the
Executive intend to and hereby confer jurisdiction to enforce the Restrictive
Covenants upon the courts of any jurisdiction within the geographical scope of
such Restrictive Covenants.  If the courts of any one or more of such
jurisdictions hold the Restrictive Covenants unenforceable by reason of the
breadth of such scope or otherwise, it is the intention of the Company that
such determination not bar or in any way affect the right of the Company to the
relief provided above in the courts of any other jurisdiction within the
geographical scope of such Restrictive Covenants, as to breaches of such
Restrictive Covenants in such other respective jurisdictions, such Restrictive
Covenants as they relate to each jurisdiction being, for this purpose,
severable into diverse and independent covenants.

         4.      Termination.

                 4.1      Termination Upon Death. If the Executive dies during
the Term, this Agreement shall terminate; provided, however, that in any such
event, the Company shall pay to the Executive's estate any portion of the
Annual Salary that shall have been earned by the Executive prior to the
termination but not yet paid, any accrued Incentive Bonus and any Benefits that
have vested in the Executive at the time of such termination as a result of his
participation in any of the Company's benefit plans shall be paid to the
Executive, or to his estate or designated beneficiary, in accordance with the
provisions of such plan; and the Company shall reimburse the Executive, or his
estate, for any expenses with respect to which the Executive is entitled to
reimbursement pursuant to Section 2.6 of this Agreement, and the Executive's
right to indemnification, payment or reimbursement pursuant to Section 6 of
this Agreement
<PAGE>   8
shall not be affected by such termination and shall continue in full force and
effect, both with respect to proceedings that are threatened, pending or
completed at the date of such termination and with respect to proceedings that
are threatened, pending or completed after that date.

                 4.2      Termination With Cause. The Company has the right, at
any time during the Term, subject to all of the provisions hereof, exercisable
by serving notice, effective on or after the date of service of such notice as
specified therein, to terminate the Executive's employment under this Agreement
and discharge the Executive with Cause.  If such right is exercised, the
Company's obligation to the Executive shall be limited solely to the payment of
unpaid Annual Salary accrued, together with any earned but unpaid Incentive
Bonus and Benefits vested up to the effective date specified in the Company's
notice of termination. As used in this Agreement, the term "Cause" shall mean
and include (i) chronic alcoholism or controlled substance abuse as determined
by a doctor mutually acceptable to the Company and the Executive, (ii) an act
of proven fraud or dishonesty on the part of the Executive with respect to the
Company or its subsidiaries; (iii) knowing and material failure by the
Executive to comply with material applicable laws and regulations relating to
the business of the Company or its subsidiaries; (iv) the Executive's
continuing failure to satisfactorily perform his duties hereunder or a material
breach by the Executive of this Agreement except, in each case, where such
failure or breach is caused by the illness or other similar incapacity or
disability of the Executive; or (v) conviction of a crime involving moral
turpitude or a felony. Prior to the effectiveness of termination for Cause
under subclause (i), (ii), (iii) or (iv) above, the Executive shall be given 30
days' prior notice from the Board specifically identifying the reasons which
are alleged to constitute Cause for any termination hereunder and an
opportunity to be heard by the Board in the event the Executive disputes such
allegations.

                 4.3      Termination Without Cause. The Company has the right,
at any time during the Term, subject to all of the provisions hereof,
exercisable by serving notice, effective on or after the date of service of
such notice as specified therein, to terminate the Executive's employment under
this Agreement and discharge the Executive without Cause. If the Executive is
terminated during the Term without Cause (including any termination which is
deemed to be a constructive termination without Cause under Section 4.6
hereof), the Company's obligation to the Executive shall be limited solely to
(a) the payment, at the times and upon the terms provided for herein, of the
greater of (i) the Executive's Annual Salary and Incentive Bonus for the number
of full months remaining in the Term of this Agreement had the Executive not
been so terminated and (ii) the Executive's Annual Salary for a period of
twelve months, in each case based on the Annual Salary of the Executive in
effect on the date of termination (or, if the Company has reduced the
Executive's Annual Salary in breach of this Agreement, the Executive's Annual
Salary before such
<PAGE>   9
reduction), together with all unpaid Incentive Bonus and Benefits awarded or
accrued up to the date of termination, and (b) the provision at the Company's
expense of continued medical and dental insurance for the Executive, with the
same or substantially similar coverage as provided by the Company to Executive
immediately prior to the date of termination, for the greater of twelve (12)
months or the number of full months remaining in the Term of this Agreement had
the Executive not been so terminated.  If the Executive is terminated after he
has received one Incentive Bonus, the Incentive Bonus in clause (i) shall be
based on the amount of that one Incentive Bonus; if he has not yet received an
Incentive Bonus, it shall be based on the minimum Incentive Bonus (i.e., one
third of the Annual Salary).  In the event of a termination by the Company
without Cause within 180 days after a Change of Control (as hereinafter
defined), including a constructive termination without Cause pursuant to
Section 4.6, the amounts due to the Executive pursuant to this Section 4.3
shall be due and payable in one lump-sum payment within 60 days after such
termination. In all other cases, any amounts due to the Executive pursuant to
this Section 4.3 shall be due and payable as and when they would have become
due and payable over the remaining Term of this Agreement had the Executive not
been so terminated.

                 4.4      Termination by the Executive. Any termination of this
Agreement by the Executive during the Term, except such termination as is
deemed to be a constructive termination without Cause by the Company under
Section 4.6 of this Agreement, shall be deemed to be a breach of the terms of
this Agreement for the purposes of Section 3.1.1 hereof and shall entitle the
Company to discontinue payment of all Annual Salary, Incentive Bonuses and
Benefits not earned and payable prior to the date of such termination.

                 4.5      Termination upon Disability. If during the Term the
Executive becomes physically or mentally disabled, whether totally or
partially, as evidenced by the written statement of a competent physician
licensed to practice medicine in the United States who is mutually acceptable
to the Company and the Executive or his closest relative if he is not then able
to make such a choice, so that the Executive is unable substantially to perform
his services hereunder for (i) a period of four consecutive months, or (ii) for
shorter periods aggregating six months during any twelve-month period, the
Company may at any time after the last day of the four consecutive months of
disability or the day on which the shorter periods of disability equal an
aggregate of six months, by written notice to the Executive, terminate the
Executive's employment hereunder and discontinue payments of the Annual Salary,
Incentive Bonuses and Benefits accruing from and after the date of such
termination. The Executive shall be entitled to the full compensation payable
to him hereunder for periods of disability shorter than the periods specified
in clauses (i) and (ii) of the previous sentence.

                 4.6      Constructive Termination Without Cause.
Notwithstanding any other provision of this Agreement, the
<PAGE>   10
Executive's employment under this Agreement may be terminated during the Term
by the Executive, which shall be deemed to be constructive termination by the
Company without Cause, if one of the following events shall occur without the
consent of the Executive: (i) a failure to elect or reelect or to appoint or
reappoint the Executive to the office of Vice President and Chief Financial
Officer of the Company; (ii) the assignment or reassignment by the Company of
the Executive to a location not within 35 miles of the Company's current
location; (iii) the liquidation, dissolution, consolidation or merger of the
Company, or transfer of all or substantially all of its assets, other than a
transaction in which a successor corporation with a net worth at least equal to
that of the Company assumes this Agreement and all obligations and undertakings
of the Company hereunder; (iv) a reduction in the Executive's fixed salary; (v)
the failure of the Company to continue to provide the Executive with office
space, related facilities and secretarial assistance that are commensurate with
the Executive's responsibilities to and position with the Company; (vi) the
notification by the Company of the Company's intention not to observe or
perform one or more of the obligations of the Company under this Agreement;
(vii) the failure by the Company to indemnify, pay or reimburse the Executive
at the time and under the circumstances required by Section 6 of this
Agreement; or (viii) the occurrence of any other material breach of this
Agreement by the Company or any of its subsidiaries.  Any such termination
shall be made by written notice to the President of the Company, specifying the
event relied upon for such termination and given within 60 days after such
event.  Any constructive termination shall be effective 60 days after the date
the President of the Company has been given such written notice setting forth
the grounds for such termination with specificity; provided, however, that the
Executive shall not be entitled to terminate this Agreement in respect of any
of the grounds set forth above if within 60 days after such notice the action
constituting such ground for termination is no longer continuing. A
constructive termination by the Company without Cause shall terminate the
Restrictive Period hereunder.

                 4.7      For the purposes hereof, a "Change of Control of the
Company" shall be deemed to have occurred if after the effective date and the
IPO (i) any "person" (as such term is used in Sections 13(d) and 14(d) of the
Act) is or becomes the "beneficial owner" (as defined in Rule 13d-3 under the
Act), directly or indirectly, of securities of the Company representing 50% or
more of the combined voting power of the Company's then outstanding securities
without the prior approval of at least a majority of the members of the Board
in office immediately prior to such person attaining such percentage interest;
(ii) there occurs a proxy contest or a consent solicitation, or the Company is
a party to a merger, consolidation, sale of assets, plan of liquidation or
other reorganization not approved by at least a majority of the members of the
Board in office, as a consequence of which members of the Board in office
immediately prior to such transaction or event constitute less than a majority
of the Board thereafter; or (iii) during any period of
<PAGE>   11
two consecutive years, other than as a result of an event described in clause
(ii) of this Section 4.7, individuals who at the beginning of such period
constituted the Board (including for this purpose any new director whose
election or nomination for election by the Company's stockholders was approved
by a vote of at least a majority of the directors then still in office who were
directors at the beginning of such period) cease for any reason to constitute
at least a majority of the Board.

         5.      Insurance. The Company may, from time to time, apply for and
take out, in its own name and at its own expense, naming itself or one or more
of its affiliates as the designated beneficiary (which it may change from time
to time), policies for life, health, accident, disability or other insurance
upon the Executive in any amount or amounts that it may deem necessary or
appropriate to protect its interest. The Executive agrees to aid the Company in
procuring such insurance by submitting to medical examinations and by filling
out, executing and delivering such applications and other instruments in
writing as may reasonably be required by an insurance company or companies to
which any application or applications for insurance may be made by or for the
Company.

         6.      Indemnification.

                 6.1      The Company shall, to the maximum extent not
prohibited by law, indemnify the Executive if he is made, or threatened to be
made, a party to any threatened, pending or completed action, suit or
proceeding, whether civil, criminal, administrative or investigative, including
an action by or in the right of the Company to procure a judgment in its favor
(collectively, a "Proceeding"), by reason of the fact that the Executive is or
was a director or officer of the Company, or is or was serving in any capacity
at the request of the Company for any other corporation, partnership, joint
venture, trust, employee benefit plan or other enterprise, against judgments,
fines, penalties, excise taxes, amounts paid in settlement and costs, charges
and expenses (including attorneys' fees and disbursements) paid or incurred in
connection with any such Proceeding.

                 6.2      The Company shall, from time to time, reimburse or
advance to the Executive the funds necessary for payment of expenses, including
attorneys' fees and disbursements, incurred in connection with any Proceeding
in advance of the final disposition of such Proceeding; provided, however.
that, if required by the Texas Business Corporation Act, such expenses incurred
by or on behalf of the Executive may be paid in advance of the final
disposition of a Proceeding only upon receipt by the Company of an undertaking,
by or on behalf of the Executive, to repay any such amount so advanced if it
shall ultimately be determined by final judicial decision from which there is
no further right of appeal that the Executive is not entitled to be indemnified
for such expenses.

                 6.3      The right to indemnification and reimbursement or
<PAGE>   12
advancement of expenses provided by, or granted pursuant to, this Section 6
shall not be deemed exclusive of any other rights which the Executive may now
or hereafter have under any law, by-law, agreement, vote of stockholders or
disinterested directors or otherwise, both as to action in his official
capacity and as to action in another capacity while holding such office.

                 6.4      The right to indemnification and reimbursement or
advancement of expenses provided by, or granted pursuant to, this Section 6
shall continue as to the Executive after he has ceased to be a director or
officer and shall inure to the benefit of the heirs, executors and
administrators of the Executive.

                 6.5      The Company shall purchase and maintain director and
officer liability insurance on such terms and providing such coverage as the
Board determines is appropriate, and the Executive shall be covered by such
insurance on the same basis as the other directors and executive officers of
the Company.

                 6.6      The right to indemnification and reimbursement or
advancement of expenses provided by, or granted pursuant to, this Section 6
shall be enforceable by the Executive in any court of competent jurisdiction.
The burden of proving that such indemnification or reimbursement or advancement
of expenses is not appropriate shall be on the Company. Neither the failure of
the Company (including its board of directors, independent legal counsel, or
its stockholders) to have made a determination prior to the commencement of
such action that such indemnification or reimbursement or advancement of
expenses is proper in the circumstances nor an actual determination by the
Company (including its board of directors, independent legal counsel, or its
stockholders) that the Executive is not entitled to such indemnification or
reimbursement or advancement of expenses shall constitute a defense to the
action or create a presumption that the Executive is not so entitled. The
Executive shall also be indemnified for any expenses incurred in connection
with successfully establishing his right to such indemnification or
reimbursement or advancement of expenses, in whole or in part, in any such
proceeding.

                 6.7      If the Executive serves (i) another corporation of
which a majority of the shares entitled to vote in the election of its
directors is held by the Company, or (ii) any employee benefit plan of the
Company or any corporation referred to in clause (i), in any capacity, then he
shall be deemed to be doing so at the request of the Company.

                 6.8      The right to indemnification or reimbursement or
advancement of expenses shall be interpreted on the basis of the applicable law
in effect at the time of the occurrence of the event or events giving rise to
the applicable Proceeding.

<PAGE>   13

         7.      Other Provisions.

                 7.1      Certain Definitions. As used in this Agreement, the
following terms have the following meanings unless the context otherwise
requires:

                          (i) "affiliate" with respect to the Company means any
         other person controlled by or under common control with the Company
         but shall not include any stockholder or director of the Company, as
         such.

                          (ii) "person" means any individual, corporation,
         partnership, firm, joint Company, association, joint-stock company,
         trust, unincorporated organization, governmental or regulatory body or
         other entity.

                          (iii) "subsidiary" means any corporation 50% or more
         of the voting securities of which are owned directly or indirectly by
         the Company.

                 7.2      Notices. Any notice or other communication required
or permitted hereunder shall be in writing and shall be delivered personally,
telegraphed, telexed, sent by facsimile transmission or sent by certified,
registered or express mail, postage prepaid. Any such notice shall be deemed
given when so delivered personally, telegraphed, telexed or sent by facsimile
transmission or, if mailed, on the date of actual receipt thereof, as follows:

                          (i)     if to the Company, to:

                                  Eagle Geophysical, Inc.
                                  50 Briar Hollow Lane
                                  West Building, 6th Floor
                                  Houston, Texas  77027
                                  Attention:  Jay N. Silverman, President

                                  with a copy to:

                                  Gardere Wynne Sewell & Riggs, L.L.P.
                                  333 Clay Avenue, Suite 800
                                  Houston, Texas  77002
                                  Attention:  N. L. Stevens III

                          (ii)    if to the Executive, to:

                                  Richard W. McNairy
                                  6519 Lussier Drive
                                  Sugar Land, Texas  77479

Any party may change its address for notice hereunder by notice to the other
party hereto.

                 7.3      Entire Agreement. This Agreement contains the entire
agreement between the parties with respect to the subject matter hereof and
supersedes all prior agreements, written or oral, with respect thereto.
<PAGE>   14
                 7.4      Waivers and Amendments. This Agreement may be
amended, superseded, canceled, renewed or extended, and the terms and
conditions hereof may be waived, only by a written instrument signed by the
parties or, in the case of a waiver, by the party waiving compliance. No delay
on the part of any party in exercising any right, power or privilege hereunder
shall operate as a waiver thereof. Nor shall any waiver on the part of any
party of any such right, power or privilege hereunder, nor any single or
partial exercise of any right, power or privilege hereunder, preclude any other
or further exercise thereof or the exercise of any other right, power or
privilege hereunder.

                 7.5      Governing Law. This Agreement shall be governed by
and construed in accordance with the laws of the State of Texas (without giving
effect to the choice of law provisions thereof) where the employment of the
Executive shall be deemed, in part, to be performed and enforcement of this
Agreement or any action taken or held with respect to this Agreement shall be
taken in the courts of appropriate jurisdiction in Houston, Texas.

                 7.6      Assignment. This Agreement, and any rights and
obligations hereunder, may not be assigned by the Executive and may be assigned
by the Company (subject to Section 4.6 (iii) hereof) only to a successor by
merger or purchasers of substantially all of the assets of the Company.

                 7.7      Counterparts. This Agreement may be executed in
separate counterparts, each of which when so executed and delivered shall be
deemed an original, but all of which together shall constitute one and the same
instrument.

                 7.8      Headings. The headings in this Agreement are for
reference purposes only and shall not in any way affect the meaning or
interpretation of this Agreement.

                 7.9      No Presumption Against Interest. This Agreement has
been negotiated. drafted, edited and reviewed by the respective parties, and
therefore, no provision arising directly or indirectly herefrom shall be
construed against any party as being drafted by said party.

                 7.10     Validity Contest. The Company shall promptly pay any
and all legal fees and expenses incurred by the Executive from time to time as
a direct result of the Company's contesting the due execution, authorization,
validity or enforceability of this Agreement.

                 7.11     Binding Agreement. This Agreement shall inure to the
benefit of and bit binding upon the Company and its respective successors and
assigns and the Executive and his legal representatives.

         IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first above written.
<PAGE>   15
                                        EAGLE GEOPHYSICAL, INC.


                                        By: /s/ Jay N. Silverman
                                           -------------------------------------
                                              Jay N. Silverman, President

                                        EXECUTIVE


                                        By: /s/ Richard W. McNairy
                                           -------------------------------------
                                              Richard W. McNairy

<PAGE>   1
                                                                EXHIBIT 10.18
                         TEXAS ASSOCIATION OF REALTORS
                                COMMERCIAL LEASE

         This lease agreement is made and entered into by and between Ron Chase
d/b/a Chase Properties (Landlord) and Eagle Geophysical/Seitel Geophysical
(Tenant).  Landlord hereby leases to Tenant and Tenant hereby leases from
Landlord that certain property with the improvements thereon, containing
approximately 7500 square feet, hereinafter called the "leased premises", known
as, 3713 U.S. 59, Rosenberg, Texas (Address), Lot ___________________, Block
_________________ Addition, City of _________________________________, Fort
Bend County, Texas; or as more particularly described Wow or on attached
exhibit:

         1 Acre tract of land out of the southwest corner of a 13.937 acre
         tract in the Emma Mayer Survey, Abstract 701, out of the H. & T. C.
         R.R. Survey Section 8, Fort Bend County, Texas.

         The primary term of this lease shall be 12 months commencing on the 15
day of April, 1994 and ending on the 14 day of April, 1995, upon the following
terms, conditions, and covenants:

1.       TAXES. Each year during the term of this lease, Landlord shall pay
         real estate taxes assessed against the leased premises in an amount
         equal to the total real estate taxes assessed against the leased
         premises in the base year. Each year during the term of this lease,
         Tenant shall pay as additional rental, upon receipt of a statement
         from Landlord together with tax statements or other verification from
         the proper taxing authority, his pro rata share of any increase in
         real estate taxes over the base year on the property of which the
         leased premises is a part. Any increase in real estate taxes for a
         fractional year shall be prorated. The base year shall be 93.

2.       UTILITIES. Tenant shall pay all charges for utility services to the
         leased premises except for _______________ which shall be paid by the
         Landlord.

3.       HOLDING OVER. Failure of Tenant to surrender the leased premises at
         the expiration of the lease constitutes a holding over which shall be
         construed as a tenancy from month to month at a rental of $1,625.00
         per month.

4.       RENT. Tenant agrees to and shall pay Landlord at P.O. Box 1187, County
         of Fort Bend, Texas, or at such other place landlord shall designate
         from time to time in writing, as rent for the leased premises, the
         total sum of $19,500.00, payable without demand in equal monthly
         payments of $1,625.00, each in advance on or before the 15th day of
         each month,  commencing on April 15, 1994, and continuing thereafter
         until the total sum shall be paid. Adjustment to the rent, if any, for
         rent escalators, for percentage of net





                                       1
<PAGE>   2
         rent, or for increases in building operation costs (including but not
         limited to insurance, custodial services, maintenance and utilities)
         shall be as set forth in an attached addendum. Rent received after the
         first day of the month shall be deemed delinquent. If rent is not
         received by Landlord by the ____________ of each month, Tenant shall
         pay a late charge of $_____ plus a penalty of $20.00 per day until
         rent is received in full.  Tenant shall pay $25.00 for each returned
         check.

5.       USE. Tenant shall use the leased premises for the following purpose
         and no other:  Home base for Geophysical crew.

6.       SECURITY DEPOSIT. Tenant shall pay to Landlord a security deposit in
         the sum of $1,625.00, payable on or before the commencement of this
         lease for Tenant's faithful performance hereunder. Refund thereof
         shall be made upon performance of this lease agreement by Tenant,
         minus any assessments or damages unless Landlord and Tenant provide
         otherwise in Special Provisions.

7.       INSURANCE. Landlord shall pay for fire and extended coverage insurance
         on the buildings and other improvements on the leased premises in an
         amount not less than $75,000.00, which amount shall be increased
         yearly in proportion to the increase in market value of the premises.
         If Landlord provides any insurance herein, Tenant shall pay to
         Landlord, during the term hereof, the amount of any increase in
         premiums for the insurance required over and above such premiums paid
         during the first year of this lease. Tenant shall provide public
         liability and property damage insurance for its business operations on
         the leased premises in the amount of $300,000/500,000 which policy
         shall cover the Landlord as well as the Tenant. Said insurance
         policies required to be provided by Tenant herein shall name Landlord
         as an insured and shall be issued by an insurance company approved by
         Landlord. Tenant shall provide Landlord with certificates of insurance
         evidencing the coverage required herein. Tenant shall be solely
         responsible for fire and casualty insurance on Tenant's property on or
         about the leased premises. If Tenant does not maintain such insurance
         in full force and effect, Landlord may notify Tenant of such failure
         and if Tenant does not deliver to Landlord within 15 days after such
         notice certification showing all such insurance to be in full force
         and effect, Landlord may at his option, take out the necessary
         insurance to comply with the provision hereof and pay the premiums on
         the items specified in such notice, and Tenant covenants thereupon on
         demand to reimburse and pay Landlord any amount so paid or expended in
         the payment of the insurance premiums required hereby and specified in
         the notice, with interest thereon at the rate of 12 percent per annum
         from the date of such payment by Landlord until repaid by Tenant.

8.       CONDITION OF PREMISES. Tenant has examined and accepts the leased
         premises in its present as is condition as suitable for the purposes
         for which the same are leased, and does hereby accept the leased
         premises regardless of reasonable deterioration between the date of
         this lease and the date Tenant begins occupying the leased premises
         unless





                                       2
<PAGE>   3
         Landlord and Tenant agree to repairs or refurbishment as noted in
         Special Provisions.

9.       MAINTENANCE AND REPAIRS. Landlord shall keep the foundation, the
         exterior walls (except glass; windows; doors; door closure devices;
         window and door frames, molding, locks, and hardware; and interior
         painting or other treatment of exterior walls), and the roof of the
         leased premises in good repair except that Landlord shall not be
         required to make any repairs occasioned by the act or negligence of
         Tenant, its employees, subtenants, licensees and concessionaires.
         Tenant is responsible for maintenance of the common area and common
         area equipment. If Landlord is responsible for any such repair and
         maintenance, Tenant agrees to give Landlord written notice of needed
         repairs. Landlord shall make such repairs within a reasonable time.
         Tenant shall notify Landlord immediately of any emergency repairs.
         Tenant shall keep the leased premises in good, clean condition and
         shall at its sole cost and expense, make all needed repairs and
         replacements, including replacement of cracked or broken glass, except
         for repairs and replacements required to be made by Landlord under
         this section. If any repairs required to be made by Tenant hereunder
         are not made within ten (10) days after written notice delivered to
         Tenant by Landlord, Landlord may at its option make such repairs
         without liability to Tenant for any loss or damage which may result by
         reason of such repairs, and Tenant shall pay to Landlord upon demand
         as additional rent hereunder the cost of such repairs plus interest.
         At the termination of this lease, Tenant shall deliver the leased
         premises in good order and condition, normal wear and tear excepted.

10.      ALTERATIONS. All alterations, additions and improvements, except trade
         fixtures, installed at expense of Tenant, shall become the property of
         Landlord and shall remain upon and be surrendered with the leased
         premises as a part thereof on the termination of this lease. Such
         alterations, additions, and improvements may only be made with the
         prior written consent of Landlord, which consent shall not be
         unreasonably withheld. If consent is granted for the making of
         improvements or alterations to the leased premises, such improvements
         and alterations shall not commence until Tenant has furnished to
         Landlord a certificate of insurance showing coverage in an amount
         satisfactory to Landlord protecting Landlord from liability for injury
         to any person and damage to any personal property, on or off the
         leased premises, in connection with the making of such improvements or
         alterations. No cooling tower, equipment, or structure of any kind
         shall be placed on the roof or elsewhere on the leased premises by
         Tenant without prior written permission of Landlord. If such
         permission is granted, such work or installation shall be done at
         Tenant's expense and in such a manner that the roof shall not be
         damaged thereby. If it becomes necessary to remove such cooling tower,
         equipment or structure temporarily, so that repairs to the roof can be
         made, Tenant shall promptly remove and reinstall the cooling tower,
         equipment or structure at Tenant's expense and repair at Tenant's
         expense any damage resulting from such removal or reinstallation. Upon
         termination of this lease, Tenant shall remove or cause to be removed
         from the roof any such cooling tower, equipment or structure if
         directed to do so by Landlord. Tenant shall promptly repair at its
         expense any damages resulting from such removal.





                                       3
<PAGE>   4
         At the termination of this lease, Tenant shall deliver the leased
         premises in good order and condition, natural deterioration only
         excepted. Any damage caused by the installation or removal of trade
         fixtures shall be repaired at Tenant's expense prior to the expiration
         of the lease term. All alterations, improvements, additions, and
         repairs made by Tenant shall be made in good and workmanlike manner.

11.      COMPLIANCE WITH LAWS AND REGULATIONS. Tenant shall, at its own
         expense, comply with all laws, orders, and requirements of all
         governmental entities with reference to the use and occupancy of the
         leased premises.  Tenant and Tenant's agents, employees and invitees
         shall fully comply with any rules and regulations governing the use of
         the buildings or other improvements to the leased premises as required
         by Landlord. Landlord may make reasonable changes in such rules and
         regulations from time to time as deemed advisable for the safety, care
         and cleanliness of the leased premises, provided same are in writing
         and are not in conflict with this lease.

12.      ASSIGNMENT AND SUBLETTING. Tenant shall not assign this lease nor
         sublet the leased premises or any interest therein without first
         obtaining the written consent of Landlord. An assignment or subletting
         without the written consent of Landlord shall be void and shall, at
         the option of Landlord, terminate this lease.

13.      DESTRUCTION. In the event the leased premises is partially damaged or
         destroyed or rendered partially unfit for occupancy by fire or other
         casualty, Tenant shall give immediate notice to Landlord. Landlord may
         repair the damage and restore the leased premises to substantially the
         same condition as immediately prior to the occurrence of the casualty.
         Such repairs shall be made at Landlord's expense unless due to
         Tenant's negligence.  Landlord shall allow Tenant a fair reduction of
         rent during the time the leased premises are partially unfit for
         occupancy. If the leased premises are totally destroyed or deemed by
         the Landlord to be rendered unfit for occupancy by fire or other
         casualty, of if Landlord shall decide not to repair or rebuild, this
         lease shall terminate and the rent shall be paid to the time of such
         casualty.

14.      TENANT DEFAULT. If Tenant abandons the premises or otherwise defaults
         in the performance of any obligations or covenants herein, Landlord
         may enforce the performance of this lease in any manner provided by
         law. This lease may be terminated at Landlord's discretion if such
         abandonment or default continues for a period of 10 days after
         Landlord notifies Tenant of such abandonment or default and of
         Landlord's intention to declare this lease terminated. Such notice
         shall be sent by Landlord to Tenant at the leased premises by
         certified mail or otherwise. If Tenant has not completely removed or
         cured default within the 10-day period, this lease shall terminate.
         Thereafter, Landlord or its agents shall have the right, without
         further notice or demand, to enter the leased premises and remove all
         persons and property without being deemed guilty of trespass and
         without waiving any other remedies for arrears of rent or breach of
         covenant. Upon abandonment or default by the Tenant, the remaining
         unpaid portion of the rental from paragraph 4 herein, shall become due
         and payable.





                                       4
<PAGE>   5
15.      LIEN. Landlord is granted an express contractual lien, in addition to
         any lien provided by law, and a security interest in all property of
         Tenant found on the leased premises to secure the compliance by Tenant
         with all terms of this lease.  In the event of default, Landlord or
         its agents may peaceably enter the leased premises and remove all
         property and dispose of same as Landlord shall see it fit.

16.      SUBORDINATION. Landlord is hereby irrevocably vested with full power
         and authority to subordinate this lease to any mortgage, deed of
         Trust, or other lien hereafter placed on the demised premises and
         Tenant agrees on demand to execute such further instruments
         subordinating this lease as Landlord may request, provided such
         subordination shall be on the express condition that this lease shall
         be recognized by the mortgagee, and the rights of Tenant shall remain
         in full force and effect during the term of this lease so long as
         Tenant shall continue to perform all of the covenants and conditions
         of this lease.

17.      INDEMNITY. Landlord and its employees and agents shall not be liable
         to Tenant or to Tenant's employees, patrons, visitors, invitees, or
         any other persons for any injury to any such persons or for damage to
         personal property caused by an act, omission, or neglect of Tenant or
         Tenant's agents or of any other tenant of the premises of which the
         leased premises is a part. Tenant agrees to indemnify and hold
         Landlord and its employees and agents harmless from any and an claims
         for such injury and damages, whether the injury occurs on or off the
         leased premises.

18.      SIGNS. Tenant shall not post or paint any signs at, on, or about the
         leased premises or paint the exterior walls of the building except
         with the prior written consent of the Landlord. Landlord shall have
         the right to remove any sign or signs in order to maintain the leased
         premises or to make any repairs or alterations thereto.

19.      TENANT BANKRUPTCY. If Tenant becomes bankrupt or makes voluntary
         assignment for the benefit of creditors or if a receiver is appointed
         for Tenant, Landlord may terminate this lease by giving five (5) days
         written notice to Tenant of Landlord's intention to do so.

20.      CONDEMNATION. If the whole or any substantial part of the leased
         premises is taken for any public or quasi-public use under any
         governmental law, ordinance or regulation or by right of eminent
         domain or should the leased premises be sold to a condemning authority
         under threat of condemnation, this lease shall terminate and the rent
         shall be abated during the unexpired portion of the lease effective
         from the date of the physical taking of the leased premises.





                                       5
<PAGE>   6
21.      BROKER'S FEE. Travis Reese, Broker and Joe Roberts, Co-Broker, as Real
         Estate Broker (the Broker), has negotiated this lease and Landlord
         agrees to pay Broker in Fort Bend County, Texas, upon commencement of
         this lease, a negotiated fee of $______________ or 6% of the total
         rental provided for in this lease to be divided as follows:  Travis
         Reese 2%, Mellon Real Estate 2%, Joe Roberts 2%.  In the event this
         lease is extended, expanded or renewed, Landlord agrees to pay Broker
         an additional negotiated fee of    $_______________ or 6% of the total
         rental for such extension, expansion or renewal period, payable at the
         time of commencement of such extension, expansion or renewal, said fee
         to be divided as follows: Reese 2%, Mellon 2%, Roberts 2%.  Tenant
         warrants that it has had no dealings with any real estate broker or
         agents in connection with the negotiation of this lease excepting only
         Reese, Mellon and Roberts and it knows of no other real estate broker
         or agent who is entitled to a commission in connection with this
         Lease. If Tenant during the term of this Lease, or any extension,
         expansion or renewal period thereof, or within days of the expiration
         of this Lease, or any extension, expansion or renewal period thereof,
         or within 90 days of the expiration of this Lease, or any extension,
         expansion or renewal period thereof, purchases the property herein
         leased, Landlord agrees to pay Broker, Reese, Mellon & Roberts, in
         Fort Bend County, Texas, a negotiated fee of $___________ or _____% of
         the sales price upon closing of the sale of this property.

22.      NOTICES. Notices to Tenant shall be by certified mail or other
         delivery to the leased premises. Notices to Landlord shall be by
         certified mail to the place where rent is payable.

23.      DEFAULT BY LANDLORD. In the event of breach by Landlord of any
         covenant, warranty, term or obligation of this lease, then Landlord's
         failure to cure same or commence a good faith effort to cure same
         within 10 days after written notice thereof by Tenant shall be
         considered a default and shall entitle Tenant either to terminate this
         lease or cure the default and make the necessary repairs and any
         expense incurred by Tenant shall be reimbursed by the Landlord after
         reasonable notice of the repairs and expenses incurred.  If any
         utility services furnished by Landlord are interrupted and continue to
         be interrupted despite the good faith efforts of Landlord to remedy
         same, Landlord shall not be liable in any respect for damages to the
         person or property of Tenant or Tenant's employees, agents, or guests,
         and same shall not be construed as grounds for constructive eviction
         or abatement of rent Landlord shall use reasonable diligence to repair
         and remedy such interruption promptly.

24.      SIGNS. During the last 30 days of this lease, a "For Sale" sign and/or
         a "For Lease" sign may be displayed on the leased premises and the
         leased premises may be shown at reasonable times to prospective
         purchasers or tenants.

25.      RIGHT OF ENTRY. Landlord shall have the right during normal business
         hours to enter the demised premises; (a) to inspect the general
         condition and state of repair thereof, (b) to make repairs required or
         permitted under this lease, or (c) for any other reasonable purpose.





                                       6
<PAGE>   7
26.      WAIVER OF BREACH. The waiver by Landlord of any breach of any
         provision of this lease shall not constitute a continuing waiver or a
         waiver of any subsequent breach of the same or a different provision
         of this lease.

27.      TIME OF ESSENCE. Time is expressly declared to be of the essence in
         this lease.

28.      BINDING OF HEIRS AND ASSIGNS. Subject to the provisions of this lease
         pertaining to assignment of the Tenant's interest, all provisions of
         this lease shall extend to and bind, or inure to the benefit not only
         of the parties to this lease but to each and every one of the heirs,
         executors, representatives, successors, and assigns of Landlord or
         Tenant.

29.      RIGHTS AND REMEDIES CUMULATIVE. The rights and remedies by this lease
         agreement are cumulative and the use of any one right or remedy by
         either party shall not preclude or waive its right to use any or all
         other remedies.  Said rights and remedies are given in addition to any
         other rights the parties may have by law, statute, ordinance, or
         otherwise.

30.      TEXAS LAW TO APPLY. This agreement shall be construed under and in
         accordance with the laws of the State of Texas.

31.      LEGAL CONSTRUCTION. In case any one or more of the provisions
         contained in this agreement shall for any reason be held to be
         invalid, illegal, or unenforceable in any respect, such invalidity,
         illegality, or unenforceability shall not affect any other provision
         hereof and this agreement shall be construed as if such invalid,
         illegal, or unenforceable provision had never been contained herein.

32.      PRIOR AGREEMENTS SUPERCEDED. This agreement constitutes the sole and
         only agreement of the parties to this lease and supersedes any prior
         understandings or written or oral agreements between the parties
         respecting the subject matter of this lease.

33.      AMENDMENT. No amendment, modification, or alteration of the terms
         hereof shall be binding unless it is in writing, dated subsequent to
         the date hereof, and duly executed by the parties.

34.      ATTORNEYS FEES. Any signatory to this lease agreement who is the
         prevailing party in any legal proceeding against any other signatory
         brought under or with relation to this lease agreement or this
         transaction shall be additionally entitled to recover court costs,
         reasonable attorney fees, and all other out-of-pocket costs of
         litigation, including deposition, travel and witness costs, from the
         nonprevailing party.

35.      SPECIAL PROVISIONS. (This section to include additional factual data
         not included above.)





                                       7
<PAGE>   8
                 (a)      Landlord to grade gravel road leading into property
                          from Fwy feeder maintain during term of this lease.
                 (b)      Landlord to paint and clean office area of lease
                          space.
                 (c)      Although water well is equipped with a chlorinator,
                          Landlord does not warrant the potability of the water
                          fitness.
                 (d)      See Attached Exhibit A. Special Provision.

         EXECUTED this 10 day of March, 1994.

         TENANT OR TENANTS                        LANDLORD
                                                  
         Eagle Geophysical/Seitel Geophysical     Chase Properties
                                                  
         /s/ Jay N. Silverman                     /s/ Ron Chase
                                                  
         REAL ESTATE BROKER                       REAL ESTATE BROKER
                                                  
         Reese Real Estate                        Mellon Real Estate
                                                  
         /s/ [illegible signature]                /s/ [illegible signature]





                                       8
<PAGE>   9
                        35.  SPECIAL PROVISION/EXHIBIT A

                       HOLD HARMLESS/HAZARDOUS SUBSTANCES

         To the full extent permitted by applicable law, Lessor hereby agrees
to defend, indemnify and hold harmless Lessee and its directors, officers,
shareholders, employees, partners, attorneys and agents (collectively called
"Indemnified Parties") from and against any and all loss, costs, expense or
liability (including attorneys' fees and court costs) incurred by any
Indemnified Party in connection with or otherwise arising out of any and all
claims or proceedings (whether brought by a private party, governmental agency
or otherwise) for bodily injury, property damage, abatement, remediation,
natural resource damage, environmental damage or impairment or any other injury
or damage resulting from or relating to any hazardous substance (herein
defined) located upon, migrating into, from or through or otherwise related to
the premises (whether or not the release of such materials was caused by
Lessor, a tenant or subtenant or Lessor, a prior owner, a tenant or subtenant
of any prior owner, a prior operator, a prior generator or transporter or any
other party and whether or not the alleged liability is attributable to the
handling, storage, generation, transportation or disposal of such hazardous
substances or the mere presence of such hazardous substances at the premises)
but excluding any hazardous substance disposed of or otherwise released on, to
or under the premises during the term of this lease (whether or not the
disposal or release of such materials were caused by Lesses).

         To the full extent permitted by applicable law, Lessee hereby agrees
to defend, indemnity and hold harmless Lessor form and against any and all
loss, costs, expense or liability (including attorneys' fees and court costs)
incurred by Lessor in connection with or otherwise arising out of any and all
claims or proceedings (whether brought by a private party, governmental agency





                                       9
<PAGE>   10
or otherwise) for bodily injury, property damage, abatement, remediation,
natural resource damage, environmental damage or impairment or any other injury
or damage resulting from or relating to any hazardous substance (herein
defined) located upon, __________ into, from or through or otherwise placed
upon on beneath the premises during the term of this lease (whether or not the
release of such materials was caused by Lessee, and whether or not the alleged
liability is attributable to the handling, storage, generation, transportation
or disposal of such hazardous substances or the mere presence of such hazardous
substances at the premises), but excluding any hazardous substance disposed of
or otherwise released on, to, or under the premises before the term of this
lease (whether or not the disposal or release of such materials was caused by
Lessor).

         Lessee specifically agrees that it will not dispose of, store,
release, or in any way locate any hazardous substance upon the leased premises
during the term of this lease or at any other time.

         Lessor reserves any rights Lessor may have under applicable law to
pursue civil or criminal remedies against any employees, agents or
representatives of Lessee, or against any other persons, who took part in the
disposal or release of any hazardous substance on, to, or under the leased
premises during the term of this lease.

         As used herein, the term "hazardous substances" shall mean any
hazardous or toxic substance, waste pollutant or contaminated material
including, without limitation, those substances within the scope of any
federal, state, special district, regional, county or local environmental laws,
regulations or ordinances, including the Resource Conservation and Recovery
Act, as amended, the Comprehensive Environmental Response, Compensation and





                                       10
<PAGE>   11
Liability act, as amended, the Superfund Amendment and Reauthorization Act of
1986, as amended, the Federal Board of Pollution Control Act, as amended, the
Clean Air Act, as amended, and the Safe Drinking Water Act, as amended.  The
provisions contained in this Article X shall survive the expiration of the term
of this Lease and shall, notwithstanding the provisions of Articles II or XV of
this lease, continue to be binding upon and enforceable against Lessor or
Lessee (depending upon when the hazardous substance was disposed of or
otherwise released on, to, or under the leased premises) notwithstanding any
subsequent assignment of Lessor's interest in or to the premises to any third
party.





                                       11

<PAGE>   1
                                                                EXHIBIT 10.19


                     MODIFICATION AND RATIFICATION OF LEASE

This Modification and Ratification of Lease Agreement is made and entered into
between Ron Chase dba Chase Properties (Lessor or Landlord) and Eagle
Geophysical/Seitel Geophysical (Lessee or Tenant) for and in consideration of
One Dollar ($1.00) and other good and valuable consideration, receipt of which
is hereby acknowledge.

                                  WITNESSETH:

         I, Lessor and Lessee hereby confirm and ratify, except as modified
below, all of the terms, conditions and covenants in that certain written Lease
Agreement dated March 10, 1994, between Lessor and Lessee, for the rental of
7500 square feet at the following location:  3713 U.S. 59, Rosenberg, Fort Bend
County, Texas.

         1.      The term of the lease shall be extended 24 months, commencing
on the 5th day of April, 1996 and ending on the 14th day of April, 1998.

         2.      The monthly rental rate shall be increased to $2,100.00.

         3.      All other terms and conditions shall remain in effect.

         SIGNED at Fort Worth, Texas, this 24th day of April, 1996.
                                        
                                        LESSOR:
                                        
                                        
                                        CHASE PROPERTIES
                                        
                                        
                                        By: /s/ Ronald Chase
                                        Name: Ronald Chase
                                        Title:  Owner
                                        
                                        
                                        LESSEE:
                                        
                                        EAGLE GEOPHYSICAL/SEITEL
                                        GEOPHYSICAL
                                        
                                        
                                        By: /s/ Jay N. Silverman
                                        Title:  President
                                        
                                        




<PAGE>   1
                                                                   EXHIBIT 10.20

         KNOW ALL MEN BY THESE PRESENTS THAT THIS AGREEMENT is made and entered
into by the Partnership of Perkins-Guidry-Beazley-Ostteen, herein represented by
Bobby C. Ostteen, Partner, hereinafter referred to as Owner, and Seitel
Geophysical, Inc., herein represented by the partners executing this instrument
hereinafter, (hereinafter referred to as Tenant).
        
                                  WITNESSETH:

         Owner, in consideration of the rental hereinafter stated, and of the
agreements of Tenant hereinafter contained, does hereby lease and let, unto
Tenant, the following described premises situated in the City of Lafayette,
Parish of Lafayette, State of Louisiana, to wit:

         That certain portion of a brick building known as building No. 22 of
         the Oil Center, located on Travis Street at Hermann Boulevard, said
         leased area measuring approximately 2,293 square feet including a pro
         rata share of common area.

         1.      This lease is made and accepted for a term of two (2) years,
Commencing June 1, 1996.

         2.      Tenant shall pay to owner, as rent for the leased premises,
the sum of One Thousand Six Hundred Twenty-Four and No/100 ($1,624.00) Dollars
per month, payable in advance on the first day of each month during the term
hereof by check drawn to the order of Owner and mailed to P.0. Box 51877,
Lafayette, LA 70505.

         3.      The premises herein leased are to be used exclusively for
office use on connection with the carrying on of its business.

         4.      Owner agrees that the leased premises are to be equipped with
necessary and proper lighting fixtures, base receptacles, telephone outlets,
electric drinking fountain, washrooms and toilet facilities.

         S.      Owner will maintain the premises herein leased, and will
maintain the landscaping of the grounds surrounding the building in which the
leased premises are located. Owner agrees to make all necessary repairs caused
by usual wear and tear, and not caused by the carelessness or neglect of the
Tenant, or its employees or guests. Owner will pay for all water, heat,
electric power and sewerage used in connection with the usual building or
office utilities.

         6.      It is understood that year round air conditioning is to be
furnished by and at the expense of the Owner so that the building is suitably
conditioned for occupancy from 7:30 A.M. to 5:30 P.M. on week days, Saturdays,
Sundays and holidays excluded.
<PAGE>   2
If desired, however, special arrangements can be made so that service can be
furnished beyond these hours, at the same cost to Tenant as that paid by owner.
Owner will furnish Tenant janitor service for the purpose of keeping the
building clean.

         7.      The cost of utilities, janitorial service, property taxes, and
insurance shall be reviewed at the end of each calendar year. If it is
determined at that time that these costs with respect to the building for the
1996 year and actual expenses for said leased building for each remaining year
have increased during the calendar year, this increase shall be paid by the
Tenant on a pro rata basis, determined by the number of square feet occupied by
the Tenant. The monthly rental for the succeeding year shall be adjusted to
reflect the increase of these costs.   As a basis of beginning, the 1996 costs
have been tabulated on a square foot basis as follows: Utilities - $1.58,
Janitorial Service - .92, Property Tax - .43, Insurance - .12, for a total of
$3.08. These amounts are subject to revision when the Building calculations for
1997 are complete and assessed for the 1997 increase.  At that time, the 
present rent will be adjusted in accordance with the provisions stated herein.

         8.      Owner agrees that all furniture, fixtures, or equipment
located within the building and placed therein by Tenant, whether permanent or
otherwise, may be removed by Tenant at the termination of the lease, provided
that no rent is due by Tenant at such termination, and provided further that
the Owner's building and premises are restored to its former condition, the
usual wear and tear excepted.

         9.      If Tenant shall fail to pay any fixed monthly rental within
thirty (30) days of its due date, Owner shall give Tenant written notice of
such delinquency, by registered mail, addressed to Tenant at 50 Briar Hollow
Lane, 7th Floor West, Houston, TX 77027, and if such rent is not paid within
thirty (30) days after receipt of such notice, then the monthly rental for the
entire remaining term of the lease shall, at Owner's option, become due and
payable without the necessity of further demand or putting in default, or Owner
may, at its election, declare the lease terminated without further action.

         10.     Owner grants to Tenant, as part of the consideration of this
lease, the right and option to renew this lease, at the termination hereof, for
an additional period of one (1) year. Should Tenant decide to exercise its
option, it shall give Owner written notice of such intention, addressed to
Owner, at P.O. Box 51877, Lafayette, Louisiana 70505, not less than 30 days
prior to the termination of the two-year period herein provided.  Such renewal 
shall be on the same terms and conditions as provided herein for the initial 
period, which shall include adjustments, if any, made to the rental 
consideration in connection with the property taxes, utilities, janitorial
service and insurance.
<PAGE>   3
         11.     Tenant accepts the premises and improvements in the condition
in which it finds the same when it takes possession under this lease, and
agrees to return the premises to the Owner, at the termination of this lease,
in good order and condition, the usual wear and tear excepted. Owner agrees to
provide a lock on tenant's office.

         12.     Tenant may assign this lease, or may sublease the leased
premises, in whole or in part, but Tenant's liability to Owner, under the terms
of this lease shall not be in any manner removed or affected by any such
assignment or sublease.

         13.     It is agreed by the parties hereto that the rights herein
granted and obligations herein made shall apply to the successors, assigns and
legal representatives of all the parties hereto.

         IN WITNESS WHEREOF this instrument is signed on this 28th day of May,
1996 in the presence of the undersigned competent witnesses.

WITNESSES:                              PERKINS-GUIDRY-BEAZLEY-OSTTEEN 
                                        PARTNERSHIP
                                        
                                        BY:  /s/ Bobby C. Ostteen
- -----------------------                     -----------------------------------
                                            Bobby C. Ostteen, Partner
                                        
                                        SEITEL GEOPHYSICAL, INC.
                                        
                                        
/s/ [illegible signature]               BY: /s/ Jay N. Silverman

<PAGE>   1
                                                                   EXHIBIT 10.23

                            EAGLE GEOPHYSICAL, INC.
                         REGISTRATION RIGHTS AGREEMENT


         This REGISTRATION RIGHTS AGREEMENT is dated as of __________, 1997
(this "Agreement"), by and among EAGLE GEOPHYSICAL, INC., a Delaware
corporation (the "Company"), and EHI HOLDINGS, INC. a Delaware corporation (the
"Stockholder").

                              W I T N E S S E T H:

         WHEREAS, the Company has undertaken the completion of an initial
public offering (the "IPO") of 4,000,000 newly-issued shares of its common
stock, $0.01 par value per share (the "Common Stock"), as well as shares of the
Common Stock held by certain selling stockholders;

         WHEREAS, Stockholder currently owns 3,400,000 shares of the Common
Stock;

         WHEREAS, as part of the IPO, Stockholder will sell 1,880,000 shares of
the Common Stock as a selling stockholder ("Stockholder's Distribution");

         WHEREAS, in connection with the IPO, the underwriters have
overallotment options with respect to a maximum of 882,000 shares of the Common
Stock (the "Overallotment Options");

         WHEREAS, up to 100,000 shares of the Common Stock that may be
purchased by the underwriters upon exercise of the Overallotment Options
("Stockholder's Share of the Overallotment") may be purchased from the
Stockholder, which shall be in addition to the Stockholder's Distribution;

         WHEREAS, the Company has agreed to provide to the Stockholder the
limited registration rights set forth herein.

         NOW, THEREFORE, in consideration of the premises and the mutual terms,
covenants and conditions herein contained, and intending to be legally bound
hereby, the parties hereto hereby agree as follows:

         1.      Definitions.  As used in this Agreement, the following
capitalized terms have the meanings specified as follows:

                 (a)      The term "Commission" means the Securities and 
Exchange Commission.

                 (b)      The term "Common Stock" has the meaning specified in
the preamble to this Agreement.

                 (c)      The term "Company" has the meaning specified in the
preamble to this Agreement.





<PAGE>   2
                 (d)      The term "Exchange Act" means the Securities Exchange
Act of 1934, as amended, and the rules and regulations of the Commission issued
under such Act, as they each may, from time to time, be in effect.

                 (e)      The term "Overallotment Options" has the meaning
specified in the preamble to this Agreement.

                 (f)      The term "Person" means an individual, partnership,
corporation, trust or unincorporated organization, or a government or agency or
political subdivision thereof.

                 (g)      The terms "register," "registered" and "registration"
refer to a registration of securities effected by preparing and filing a
registration statement or similar document in compliance with the Securities
Act (as defined below), and the declaration or ordering of effectiveness of
such registration statement or document.

                 (h)      The term "Registrable Securities" means (i) the
1,520,000 shares of Common Stock held by the Stockholder after the
Stockholder's Distribution, less Stockholder's Share of the Overallotment to
the extent actually exercised by the underwriters, and (ii) any other shares of
Common Stock issued as a dividend or other distribution with respect to, or in
exchange for or in replacement of, such shares of Common Stock; provided,
however, that any such shares of Common Stock shall cease to be Registrable
Securities when such shares have been effectively registered under the
Securities Act and disposed of in accordance with a registration statement or
such shares are sold pursuant to Rule 144 (or any similar provision then in
force) under the Securities Act.

                 (i)      The term "Securities Act" means the Securities Act of
1933, as amended, and the rules and regulations of the Commission issued under
such Act, as they each may, from time to time, be in effect.

                 (j)      The term "Stockholder" means the person defined as
such in the preamble to this Agreement to whom registration rights are hereby
granted, and any transferee to whom the rights granted under this Agreement are
assigned in accordance with Section 13 hereof.

                 (k)      The term "Stockholder's Distribution" has the meaning
specified in the preamble to this Agreement.

                 (l)      The term "Stockholder's Share of the Overallotment"
has the meaning specified in the preamble to this Agreement.

         2.      Securities Subject to this Agreement.  The securities entitled
to the benefits of this Agreement are the Registrable Securities.
Notwithstanding any provision contained herein, Stockholder hereby agrees that,
prior to the date two (2) years after the date of this Agreement, it will not
sell under any registration statement filed by the Company pursuant hereto more
than fifty percent (50%) of the Registrable Securities held by Stockholder
immediately following the completion of the IPO or, if applicable, any exercise
of the Overallotment Options by the underwriters.





                                       2
<PAGE>   3
         3.      Shelf Registration.  The Company shall file a "shelf"
registration statement covering the Registrable Securities on any appropriate
form pursuant to Rule 415 (or any similar rule that may be adopted by the
Commission) under the Securities Act no later than 370 days after the date of
this Agreement. The Company agrees to use its best efforts to cause such shelf
registration statement to become effective as promptly as practicable after the
filing thereof and to keep it continuously effective thereafter for a period of
two years from the effective date of such registration statement.
Notwithstanding anything herein to the contrary, the period during which the
Company is obligated to maintain the effectiveness of a registration statement
hereunder will terminate when all the Registrable Securities covered by the
shelf registration statement have been sold.

         4.      Piggyback Registration.

                 (a)      If, at any time before the expiration of three years
after the date of this Agreement, the Company proposes to file a registration
statement relating to any of its equity securities under the Securities Act
other than (i) a registration statement on Form S-4 or Form S-8 or successor
forms thereto or a registration on any other form which does not include
substantially the same information as would be required to be included in a
registration statement covering the Registrable Securities; or (ii) a
registration statement filed in connection with an exchange offer or an
offering of securities solely to the Company's existing stockholders or its
employees, the Company will give written notice no less than 30 days prior to
such filing to the Stockholder offering the opportunity to register on such
registration statement such number of Registrable Securities as Stockholder may
request (such notice to specify, among other things, the proposed offering
price, the kind and number of securities proposed to be registered and the
distribution arrangements, including identification of the managing
underwriter(s)).  The Company will use all reasonable efforts to include in
such registration all Registrable Securities with respect to which the Company
has received written request for inclusion within 15 days after the Company's
notice has been so given.

                 (b)      If any registration statement is an underwritten
public offering, the right of the Stockholder to registration pursuant to this
Section 4 shall be conditioned upon such Stockholder's participation in such
reasonable underwriting arrangements as the Company shall make regarding the
offering, and the inclusion of Registrable Securities in the underwriting shall
be limited to the extent provided herein. The Stockholder shall (together with
the Company and the other holders distributing their securities through such
underwriting) enter into an underwriting agreement in customary form with the
managing underwriter selected for such underwriting by the Company.
Notwithstanding any other provision of this Section 4(b), if the managing
underwriter concludes in its reasonable judgment that the number of shares to
be registered for selling stockholders (including the Stockholder) would
materially adversely effect such offering, the number of shares of the Common
Stock to be registered, together with the number of shares of Common Stock or
other securities held by other stockholders proposed to be registered in such
offering, shall be reduced on a pro rata basis based on the number of shares





                                       3
<PAGE>   4
of the Common Stock proposed to be sold by the Stockholder as compared to the
number of shares proposed to be sold by all stockholders.  If the Stockholder
disapproves of the terms of any such underwriting, it may elect to withdraw
therefrom by written notice to the Company and the managing underwriter,
delivered not less than ten days before the effective date. The Registrable
Securities excluded by the managing underwriter or withdrawn from such
underwriting shall be withdrawn from such registration, and shall not be
transferred in a public distribution prior to 120 days after the effective date
of the registration statement relating thereto, or such other shorter period of
time as the underwriters may require.

         5.      Registration Procedures.  In connection with the Company's
shelf registration obligations pursuant to Section 3 and piggyback registration
obligations pursuant to Section 4 hereof, the Company shall as expeditiously as
reasonably practicable:

                 (a)      Prepare and file with the Commission a registration
statement on an appropriate form under the Securities Act and use its best
efforts to cause such registration statement to become effective; provided,
that before filing a registration statement or prospectus or any amendments or
supplements thereto, the Company will furnish to the Stockholder and the
underwriters, if any, as soon as practicable, copies of all such documents
proposed to be filed, which documents will be subject to the review of the
Stockholder and the underwriters, and the Company will not file any
registration statement or amendment thereto, or any prospectus or any
supplement thereto, to which Stockholder or the underwriters shall reasonably
object in light of the requirements of the Securities Act and any other
applicable laws and regulations.

                 (b)      Prepare and file with the Commission such amendments
and post-effective amendments to a registration statement as may be necessary
to keep such registration statement effective for the applicable period; cause
the related prospectus to be filed pursuant to Rule 424(b) under the Securities
Act; cause such prospectus to be supplemented by any required prospectus
supplement and, as so supplemented, to be filed pursuant to Rule 424(b) under
the Securities Act; and comply with the provisions of the Securities Act with
respect to the disposition of all securities covered by such registration
statement during the applicable period in accordance with the intended methods
of disposition set forth in such registration statement or supplement to such
prospectus.

                 (c)      Notify the Stockholder and the managing underwriters,
if any, promptly, and (if requested by any such Person) confirm such advice in
writing, (i) when a prospectus or any prospectus supplement or post-effective
amendment has been filed, and, with respect to a registration statement or any
post-effective amendment, when the same has become effective, (ii) of any
request by the Commission for amendments or supplements to a registration
statement or related prospectus or for additional information, (iii) of the
issuance by the Commission of any stop order suspending the effectiveness of a
registration statement or the initiation of any proceeding for that purpose,
(iv) if at any time the representations and warranties of the Company
contemplated by Section 5(m) cease to be true and correct, (v) of the receipt
by the Company of any notification with respect to the suspension or
qualification of any of the Registrable Securities for sale in any jurisdiction
or the initiation of any proceeding for such purpose, (vi) of the happening of
any event which requires the making of any changes in a registration statement
or





                                       4
<PAGE>   5
related prospectus so that such documents will not contain any untrue statement
of a material fact or omit to state any material fact required to be stated
therein or necessary to make the statements therein not misleading, and (vii)
of the Company's reasonable determination that a post-effective amendment to a
registration statement would be appropriate or that there exist circumstances
not yet disclosed to the public which make further sales under such
registration statement inadvisable pending such disclosures and post-effective
amendment.

                 (d)      Exercise its best efforts to obtain the withdrawal of
any order suspending the effectiveness of a registration statement, or the
lifting of any suspension of the qualification of any of the Registrable
Securities for sale in any jurisdiction, at the earliest possible moment.

                 (e)      If requested by Stockholder or the managing
underwriters in connection with an underwritten offering, promptly incorporate
in a prospectus supplement or post-effective amendment such information as
Stockholder or the managing underwriters agree should be included therein
relating to such sale and distribution of Registrable Securities, including,
without limitation, information with respect to the number of shares of
Registrable Securities being sold to such underwriters and the purchase price
being paid therefor by such underwriters and with respect to any other terms of
the underwritten (or best efforts underwritten) offering of the Registrable
Securities to be sold in such offering; make all required filings of such
prospectus supplement or post-effective amendment as soon as notified of the
matters to be incorporated in such prospectus supplement or post-effective
amendment; and supplement or make amendments to any registration statement if
requested by Stockholder or any underwriter of such Registrable Securities.

                 (f)      Furnish to the Stockholder and each managing
underwriter, if any, without charge, at least one signed copy of the
registration statement, any post-effective amendment thereto, including
financial statements and schedules, all documents incorporated therein by
reference and all exhibits (including those incorporated by reference).

                 (g)      Deliver without charge to the Stockholder and the
underwriters, if any, as many copies of the prospectus or prospectuses
(including each preliminary prospectus) and any amendment or supplement thereto
as such Persons may reasonably request; and the Company consents to the use of
such prospectus or any amendment or supplement thereto by the Stockholder and
the underwriters, if any, in connection with the offer and sale of the
Registrable Securities covered by such prospectus or any amendment or
supplement thereto.

                 (h)      Prior to any public offering of Registrable
Securities, register or qualify or cooperate with the Stockholder, the
underwriters, if any, and respective counsel in connection with the
registration or qualification of such Registrable Securities for offer and sale
under the securities or blue sky laws of such jurisdictions as the Stockholder
or an underwriter reasonably requests in writing; keep each such registration
or qualification effective during the period such registration statement is
required to be kept effective and do any and all other acts or things necessary
or advisable to enable the disposition in such jurisdictions of the Registrable
Securities covered by the applicable registration statement; provided, however,
that the Company will not be required in connection therewith or as a condition
thereto to qualify generally to do business or subject itself to general
service of process in any such jurisdiction where it is not then so subject.





                                       5
<PAGE>   6
                 (i)      Cooperate with the Stockholder and the managing
underwriters, if any, to facilitate the timely preparation and delivery of
certificates representing Registrable Securities to be sold and not bearing any
restrictive legends; and enable such Registrable Securities to be in such
denominations and registered in such names as the managing underwriters may
request at least two business days prior to any sale of Registrable Securities
to the underwriters.

                 (j)      Use its best efforts to cause the Registrable
Securities to be listed on each national securities exchange on which similar
securities issued by the Company are then listed.

                 (k)      Use its best efforts to cause the Registrable
Securities covered by the applicable registration statement to be registered
with or approved by such other governmental agencies or authorities as may be
necessary, if any, to consummate the disposition of such Registrable
Securities.

                 (l)      Upon the occurrence of any event contemplated by
Section 5(c)(ii) - (vii) above, prepare a supplement or post-effective
amendment to the applicable registration statement or related prospectus or any
document incorporated therein by reference or file any other required document
so that, as thereafter delivered to the purchaser of the Registrable Securities
being sold thereunder, such prospectus will not contain an untrue statement of
a material fact or omit to state any material fact necessary to make the
statements therein not misleading.

                 (m)      Enter into such agreements (including an underwriting
agreement) and take all such other actions in connection therewith in order to
expedite or facilitate the disposition of such Registrable Securities and in
such connection, whether or not an underwriting agreement is entered into and
whether or not the Registrable Securities to be covered by such registration
are to be offered in an underwritten offering: (i) make such representations
and warranties to the Stockholder with respect to the registration statement,
prospectus and documents incorporated by reference, if any, in form, substance
and scope as are customarily made by issuers to underwriters in underwritten
offerings and confirm the same if and when requested; (ii) obtain opinions of
counsel to the Company and updates thereof with respect to the registration
statement and the prospectus in the form, scope and substance which are
customarily delivered in underwritten offerings; (iii) in the case of an
underwritten offering, enter into an underwriting agreement in form, scope and
substance as is customary in underwritten offerings and obtain opinions of
counsel to the Company and updates thereof (which counsel and opinions in form,
scope and substance shall be reasonably satisfactory to the managing
underwriters and not reasonably objected to by Stockholder) addressed to the
Stockholder and the underwriters, if any, covering the matters customarily
covered in opinions delivered in underwritten offerings and such other matters
as may be reasonably requested by Stockholder and such underwriters; (iv)
obtain "cold comfort" letters and updates thereof from the Company's
independent certified public accountants addressed to the Stockholder and the
underwriters, if any, such letters to be in customary form and covering matters
of the type customarily covered in "cold comfort" letters by accountants in
connection with underwritten offerings; (v) if any underwriting agreement is
entered into, set





                                       6
<PAGE>   7
forth in full in such underwriting agreement the indemnification provisions and
procedures customarily included in underwriting agreements in underwritten
offerings; and (vi) deliver such documents and certificates as may be requested
by the managing underwriters, if any, and Stockholder to evidence compliance
with clause (k) above and with any customary conditions contained in the
underwriting agreement or other agreement entered into by the Company.

                 (n)      Make available for inspection by a representative of
the Stockholder, any underwriter participating in any disposition pursuant to
such registration, and any attorney or accountant retained by the Stockholder
or such underwriter, all financial and other records, pertinent corporate
documents and properties of the Company, and cause the Company's officers,
directors and employees to supply all information reasonably requested by any
such representative, underwriter, attorney or accountant in connection with
such registration; provided that any records, information or documents that are
designated by the Company in writing as confidential shall be kept confidential
by such Persons unless disclosure of such records, information or documents is
required by applicable law or court or administrative order.

                 (o)      Otherwise use its best efforts to comply with all
applicable rules and regulations of the Commission and make generally available
to its security holders earnings statements satisfying the provisions of
Section 11(a) of the Securities Act and Rule 158 promulgated thereunder.

         6.      Contents of Registration Statement.  In connection with any
registration of Registrable Securities, the Company may require Stockholder to
furnish to the Company such information regarding itself and the distribution
of such securities as the Company may from time to time reasonably request in
writing. If the Company, in the exercise of its reasonable judgment, objects to
any information relating to the Company requested by the Stockholder or the
underwriters, if any, to be included in any registration statement or
prospectus or any amendments or supplements thereto, the Company shall not be
obligated to include such objectionable information, and the Stockholder may
withdraw the Registrable Securities from such registration, in which event the
shelf registration statement or an amendment thereto shall be filed as soon as
agreement with respect to any proposed change shall be reached among the
Company, the Stockholder and the managing underwriter, if any.

         7.      Stand-off Agreement.  Stockholder agrees that, upon receipt of
any notice from the Company of the happening of any event of the kind described
in Section 5(c)(ii)-(vii) hereof, Stockholder will forthwith discontinue
disposition of Registrable Securities covered by such registration statement or
prospectus until the Stockholder's receipt of copies of the supplemented or
amended prospectus contemplated by Section 5(l) hereof, or until it is advised
in writing by the Company that the use of the applicable prospectus may be
resumed, and has received copies of any additional or supplemental filings
which are incorporated by reference in such prospectus, and, if so directed by
the Company, Stockholder will deliver to the Company all copies, other than
permanent file copies then in Stockholder's possession, of the prospectus
covering such Registrable Securities current at the time of receipt of such
notice. In the event the Company shall give any such notice, the time period
regarding maintaining the effectiveness of such registration statement set
forth in Section 3 shall be extended by the number of days during the time
period





                                       7
<PAGE>   8
from and including the date of the giving of such notice pursuant to Section
5(c) hereof to and including the date when the Stockholder shall have (i)
received the copies of the supplemented or amended prospectus contemplated by
Section 5(l) hereof, or (ii) been advised in writing by the Company that use of
the prospectus may be resumed.

         8.      Hold-back Agreement.  In the event that (i) the Company
pursues an underwritten public offering on its own behalf of its Common Stock
during the period during which the Company is obligated to use its best efforts
to obtain and maintain the effectiveness of the registration statement set
forth in Section 3 (the "Effective Period"), and (ii) the managing underwriter
or underwriters of such offering determine, in their discretion, that the total
amount of Common Stock included in the distribution pursuant to the shelf
registration contemplated hereby would materially adversely affect the success
of such public offering by the Company, then Stockholder agrees not to sell any
Registrable Securities under the shelf registration statement described in
Section 3 without the prior written consent of the Company and such
underwriters, during the 14-day period prior to, and during the 120-day period
beginning on, the effective date of such registration statement (to the extent
timely notified in writing by the Company or the managing underwriters);
provided, however, that, in the event of any such offering, (1) Stockholder
shall be provided the opportunity to sell pursuant to the terms of Section 4 of
this Agreement, if it so desires, not less than twenty-five percent (25%) of
the number of Registrable Securities held by the Stockholder immediately
following the completion of the IPO or, if applicable, any exercise of the
Overallotment Options by the underwriters, and (2) the Effective Period shall
be extended by the number of days during the time period from and including the
date 14 days prior to the effective date of such registration statement and
ending 120 days after the effective date of such registration statement.
Notwithstanding the foregoing, Stockholder shall be subject to the hold-back
restrictions of this Section 8 not more than once during the Effective Period.

         9.      Expenses of Registration.  All expenses incurred in connection
with a registration, filing or qualification pursuant to Sections 3 or 4 hereof
(other than fees and expenses of counsel for the Stockholder), including,
without limitation, registration, filing and qualification fees, printers' and
accounting fees, and the fees and disbursements of counsel for the Company,
shall be borne and paid by the Company; provided, however, that the Stockholder
shall bear and pay all underwriting discounts and selling commissions
attributable to sales of Registrable Securities.

         10.     Underwritten Registrations.  If any of the Registrable
Securities covered by any registration under Section 3 are to be sold in an
underwritten offering, the investment banker or investment bankers and manager
or managers that will administer the offering may be selected by the
Stockholder; provided, that such investment bankers and managers must be
reasonably satisfactory to the Company.

         11.     Indemnification.  In the event any Registrable Securities are
included in a registration statement under this Agreement:

                 (a)      To the extent permitted by law, the Company will
indemnify and hold harmless Stockholder, the officers and directors of
Stockholder, each underwriter of Registrable





                                       8
<PAGE>   9
Securities and each other Person, if any, who controls Stockholder or such
underwriter within the meaning of Section 16 of the Securities Act, against any
losses, claims, damages, liabilities or expenses, joint or several, to which
any such Person may become subject under the Securities Act or otherwise,
insofar as such losses, claims, damages, liabilities or expenses (or actions in
respect thereof) arise out of or are based upon (i) any untrue statement or
alleged untrue statement of a material fact contained in any registration
statement under which such Registrable Securities were registered under the
Securities Act pursuant hereto, or any post-effective amendment thereof, or any
omission or alleged omission therefrom of a material fact required to be stated
therein or necessary to make the statements therein not misleading, or (ii) any
untrue statement or alleged untrue statement of a material fact contained in
any preliminary prospectus, if used prior to the effective date of the
registration statement and not corrected in the final prospectus, or contained
in the final prospectus (as amended or supplemented, if the Company shall have
filed with the Commission any amendment thereof or supplement thereto), or any
omission or alleged omission therefrom of a material fact required to be stated
therein or necessary to make the statements therein not misleading; and will
reimburse any such Person for any legal or other expenses reasonably incurred
by such Person in connection with investigating or defending any such loss,
claim, damage, liability or expense; provided, however, that the indemnity
agreement contained in this Section 11(a) shall not apply to amounts paid in
settlement of any such loss, claim, damage, liability or expense if such
settlement is effected without the consent of the Company (which consent shall
not be unreasonably withheld); and provided further that the Company shall not
be liable in any such case to the extent that any such loss, claim, damage,
liability or expense arises out of or is based upon (x) any such untrue
statement or omission or alleged untrue statement or omission which has been
made in said registration statement, preliminary prospectus, prospectus or
amendment or supplement or omitted therefrom in reliance upon and in conformity
with information furnished in writing to the Company by the Stockholder or such
underwriter specifically for use in the preparation thereof, (y) the fact that
Stockholder sold Registrable Securities to a Person to whom there was not sent
or given, at or before written confirmation of such sale, a copy of the
prospectus (excluding documents incorporated by reference), or of the
prospectus as then amended or supplemented (excluding documents incorporated by
reference) if the Company has previously furnished copies thereof to
Stockholder in compliance with the Agreement and the loss, claim, damage,
liability or expense of Stockholder results from an untrue statement of
material fact contained in such preliminary prospectus which was corrected in
the prospectus (or the prospectus as amended or supplemented); and (z) any
violation by the Stockholder of its obligations under Section 7 hereof.

                 (b)      To the extent permitted by law, Stockholder will
indemnify and hold harmless the Company, each of its directors, each of its
officers who has signed the registration statement, each Person, if any, who
controls the Company within the meaning of Section 15 of the Securities Act,
each underwriter and each Person who controls any underwriter within the
meaning of Section 15 of the Securities Act, against any losses, claims,
damages, liabilities or expenses, joint or several, to which the Company or any
such Person may become subject under the Securities Act or otherwise, and will
reimburse the Company or any such Person for any legal or other expenses
reasonably incurred by the Company or such Person in connection with
investigating or defending any such loss, claim, damage, liability or expense,
but only insofar as such losses, claims, damages, liabilities or expenses (or
actions in respect thereof) arise out of or





                                       9
<PAGE>   10
are based upon (x) any untrue statement or omission or alleged untrue statement
or omission of a material fact referred to in clause (i) or (ii) of Section
11(a) hereof, in each case to the extent (and only to the extent) that such
untrue statement or omission or alleged untrue statement or omission was made
in reliance upon and in conformity with information furnished in writing by or
on behalf of Stockholder specifically for use in connection with such
registration; (y) with respect to any preliminary prospectus, the fact that the
Stockholder sold Registrable Securities to a person to whom there was not sent
or given, at or before written confirmation of such sale, a copy of the
prospectus (excluding the documents incorporated by reference) or of the
prospectus as then amended or supplemented (excluding documents incorporated by
reference) if the Company has previously furnished copies thereof to
Stockholder in compliance with this Agreement and the loss, claim, damage,
liability or expense of the Company or such Person result from an untrue
statement or omission of a material fact contained in such preliminary
prospectus which was corrected in the prospectus (or the prospectus as amended
or supplemented); and (z) with respect to any sales made during any period in
which the Company had notified the Stockholder pursuant to Section 7 hereof to
suspend sales; provided, however, that the indemnity agreement contained in
this Section 11(b) shall not apply to amounts paid in settlement of any such
loss, claim, damage, liability or expense if such settlement is effected
without the consent of Stockholder, which consent shall not be unreasonably
withheld; and provided further that the obligations of Stockholder under this
Section 11(b) shall be limited to an amount equal to the proceeds from the sale
by Stockholder of Registrable Securities included in a registration statement
under this Agreement.

                 (c)      Promptly after receipt by an indemnified party under
this Section 11 of notice of the commencement of any action (including any
governmental action), such indemnified party will, if a claim in respect
thereof is to be made against an indemnifying pay under this Section 11, notify
the indemnifying party in writing of the commencement thereof; provided,
however, that the failure to so notify the indemnifying party shall not relieve
the indemnifying party from any liability hereunder except to the extent that
the indemnifying party is actually prejudiced by such failure to give notice.
The indemnifying party shall have the right to participate in, and, to the
extent the indemnifying party so desires, to assume the defense thereof with
counsel mutually satisfactory to the parties; provided, however, that an
indemnified party shall have the right to retain its own counsel, with the fees
and expenses to be paid by the indemnifying party, if representation of such
indemnified party by the counsel retained by the indemnifying party would be
inappropriate due to actual or potential differing interests between such
indemnified party and any other party represented by such counsel in such
proceeding.

                 (d)      If the indemnification provided for in this Section
11 from the indemnifying party is unavailable to an indemnified party hereunder
in respect of any losses, claims, damages, liabilities or expenses referred to
herein, then the indemnifying party, in lieu of indemnifying such indemnified
party, shall contribute to the amount paid or payable by such indemnified party
as a result of such losses, claims, damages, liabilities or expenses in such
proportion as is appropriate to reflect the relative benefits received by the
indemnifying party and the indemnified parties, the relative fault of the
indemnifying party and indemnified parties in connection with the actions which
resulted in such losses, claims, damages, liabilities or expenses, as well as
any other relevant equitable considerations. The relative fault of such
indemnifying party and





                                       10
<PAGE>   11
indemnified parties shall be determined by reference to, among other things,
whether any action in question, including any untrue or alleged untrue
statement of a material fact or omission or alleged omission to state a
material fact, has been made by, or relates to information supplied by, such
indemnifying party or indemnified parties, and the parties' relative intent,
knowledge, access to information and opportunity to correct or prevent such
action.  The amount paid or payable by a party as a result of the losses,
claims, damages, liabilities and expenses referred to above shall be deemed to
include, subject to the limitations set forth in Section 11(c) hereof, any
legal or other fees or expenses reasonably incurred by such party in connection
with any investigation or proceeding. The parties hereto agree that it would
not be just and equitable if contribution pursuant to this Section 11(d) were
determined by pro rata allocation or by any other method of allocation which
does not take into account the equitable considerations referred to in this
paragraph. No Person guilty of fraudulent misrepresentation (within the meaning
of Section 11(f) of the Securities Act) shall be entitled to contribution from
any Person who was not guilty of such fraudulent misrepresentation.

         12.     Reports Under Exchange Act.  With a view to making available
to the Stockholder the benefits of Rule 144 under the Securities Act and any
other rule or regulation of the Commission that may at any time permit the
Stockholder to sell securities of the Company to the public without
registration, the Company agrees, for so long as Stockholder holds the
Registrable Securities, to:

                 (a)      file with the Commission in a timely manner all
reports and other documents required of the Company under the Securities Act
and the Exchange Act, and the rules and regulations adopted by the Commission
thereunder; and

                 (b)      furnish to the Stockholder forthwith upon request (i)
a written statement by the Company as to whether it has complied with the
reporting requirements of Rule 144, (ii) a copy of the most recent annual or
quarterly report of the Company and such other reports and documents filed by
the Company pursuant to the Exchange Act, and (iii) such other information as
may be reasonably requested in availing the Stockholder of any rule or
regulation of the Commission which permits the sale of any securities without
registration.

         13.     Assignment of Registration Rights.  The right to cause the
Company to register Registrable Securities pursuant to this Agreement may not
be transferred or assigned, in whole or in part, by Stockholder without the
prior written consent of the Company.

         14.     Miscellaneous.

                 (a)      Successors and Assigns:  No Third Party Benefit.
This Agreement shall be binding upon and inure to the benefit of the parties
and their respective permitted successors and assigns. Nothing in this
Agreement, express or implied, is intended to confer upon any party other than
the parties hereto and their respective permitted successors and assigns any
rights or remedies under or by reason of this Agreement, except as expressly
provided in this Agreement.





                                       11
<PAGE>   12
                 (b)      Governing Law.  This Agreement shall be governed by,
and construed and enforced in accordance with, the substantive laws of the
State of Texas, without giving effect to the principles of conflicts of law
thereof.

                 (c)      Counterparts.  This Agreement may be executed by the
parties hereto in separate counterparts, each of which when so executed and
delivered shall be deemed an original, but all such counterparts shall together
constitute one and the same instrument. Each counterpart may consist of a
number of copies hereof each signed by less than all, but together signed by
all, the parties hereto.

                 (d)      Titles and Subtitles.  The titles and subtitles used
in this Agreement are inserted for convenience only and are not to be
considered in construing or interpreting this Agreement.

                 (e)      Notices.  All notices and other communications
provided for or permitted hereunder shall be made in writing and shall be
delivered by (i) personal delivery, (ii) expedited delivery service, (iii)
certified or registered mail, postage prepaid, or (iv) confirmed facsimile
transmission. Any such notice shall be deemed given upon its receipt at the
following address (or such other address as may be specified by such party upon
written notice to the others in accordance with this Section 14(f)):

         If to the Company:       Eagle Geophysical, Inc.
                                  50 Briar Hollow Lane West, 6th Floor
                                  Houston, Texas 77027
                                  Attention: Jay N. Silverman, President
                                  Telephone:  (713) 881-2893
                                  Telefax:  (713) 627-1020
                                  
         If to Stockholder:       EHI Holdings, Inc.
                                  50 Briar Hollow Lane West, 7th Floor
                                  Houston, Texas 77027
                                  Attention: Paul A. Frame, President
                                  Telephone:  (713) 881-8900
                                  Telefax:  (713) 627-2045

                 (f)      Amendments and Waivers.  The terms and provisions of
this Agreement may not be modified or amended, or any of the provisions hereof
waived, temporarily or permanently, except pursuant to a writing executed by
the Company and the Stockholder.  A waiver by any party of a breach of any term
or provision of this Agreement shall not be construed as a waiver of any
subsequent breach.

                 (g)      Severability.  If any provision or any portion of any
provision of this Agreement or the application of such provision or any portion
thereof to any Person or circumstance shall be held invalid or unenforceable,
the remaining portion of such provision, as it applies to other Persons or
circumstances and the remaining provisions, shall not be affected or impaired
thereby.





                                       12
<PAGE>   13
                 (h)      Entire Agreement.  This Agreement is intended by the
parties as a final expression of their agreement and intended to be a complete
and exclusive statement of the agreement and understanding of the parties
hereto in respect of the subject matter herein contained. There are no
restrictions, promises, warranties or undertakings, other than those set forth
or referred to herein, with respect to the registration rights granted by the
Company.  This Agreement supersedes all prior agreements and understandings
between the parties with respect to such subject matter.


         IN WITNESS WHEREOF, the parties have caused this Agreement to be duly
executed as of the date first above written.

                                     EAGLE GEOPHYSICAL, INC.
                                     
                                     
                                     By:  
                                          -------------------------------------
                                          Jay N. Silverman, President
                                     
                                     
                                     
                                     EHI HOLDINGS, INC.
                                     
                                     
                                     By:       
                                          -------------------------------------
                                          Paul A. Frame, President





                                       13

<PAGE>   1


                                                                           10.25

                       ADMINISTRATIVE SERVICES AGREEMENT


       This Administrative Services Agreement ("Agreement") is entered into as
of ____________________, 1997 by and between Seitel, Inc., a Delaware
corporation ("Seitel"), and Eagle Geophysical, Inc., a Delaware corporation
("Eagle").


                                    RECITALS

       Prior to execution of this Agreement, Eagle was a wholly-owned
subsidiary of Seitel.  Eagle has undertaken a series of transactions, including
the issuance of new shares in consideration for the acquisition of Energy
Research International and the issuance of new shares for cash in an initial
public offering (the "IPO"), consummated on the date hereof, and Seitel has
sold in such IPO a portion of the shares of Eagle that it owned, as a result of
which Eagle is no longer a wholly-owned subsidiary of Seitel.

       During the period when Eagle was a wholly-owned subsidiary of Seitel,
Eagle relied on Seitel for the provision of certain administrative services
relating to Eagle's onshore seismic data acquisition business, which
administrative services Eagle intends in the future to provide for itself.
However, in order to provide for an orderly transition from Seitel providing
such administrative services to Eagle providing such services, and to allow
Eagle a reasonable time in which to assemble its own staff to provide such
services, Seitel has agreed to make available to Eagle for a transition period
of up to 90 days those administrative services formerly provided to Eagle with
respect to Eagle's onshore seismic data acquisition business, all pursuant to
the terms of this Agreement.


                                   AGREEMENT

       NOW, THEREFORE, for and in consideration of the mutual agreements
contained herein, the parties hereby agree as follows:

       Section 1.  Defined Terms.   The following terms will have the following
meanings when used in this Agreement:

       "Accountant" means the certified public accounting firm most recently
retained by Seitel to audit its financial statements.

       "Associate" means with respect to Seitel, any shareholder, director,
officer or employee of Seitel or any attorney, accountant, representative or
agent retained by Seitel.

       "Expenses" means any reasonable and necessary out-of-pocket expenses
incurred in connection with the provision of the Services,
<PAGE>   2
including any taxes or other governmental impositions attributable to the
provision of the Services (other than income or other similar taxes assessed on
the Fees), but not including any general or administrative overhead expense of
Seitel.

       "Fees" means the fees payable to Seitel pursuant to Section 3 hereof.

       "Force Majeure Event" means (a) a fire, flood, explosion, riot,
rebellion, revolution, labor trouble (whether or not due to the fault of such
Party), requirements or acts of any government authority or agency or
subdivision thereof, loss of source of supplies or other inability to obtain
materials or suppliers, or (b) any other cause, whether similar or dissimilar
to the foregoing, beyond the reasonable control of the Parties hereto.

       "Loss" means any and all claims, liabilities, obligations, losses,
deficiencies and damages or judgments of any kind or nature whatsoever arising
from, asserted against, or associated with the furnishing or failure to furnish
the Services, regardless of by whom asserted and regardless of whether or not
any such loss is known or unknown, fixed or contingent or asserted or
unasserted.

       "Eagle Account" means a bank account established in the name of Eagle.

       "Party" means either of Seitel or Eagle.

       "Services" means the services described in the schedule attached as
Exhibit A to this Agreement or any other service provided by Seitel to Eagle at
the request of Eagle; provided that Seitel shall not be obligated to provide
any services to Eagle other than those set forth on Exhibit A.

       Section 2.  Services.  Seitel will provide the Services described on
Exhibit A to Eagle.  Such services will only be provided with respect to
Eagle's onshore seismic data acquisition business.  Seitel may, in its sole
discretion, provide other Services to Eagle upon request by Eagle.  The
Services will be of the type and at the level provided by Seitel to Eagle
before the IPO.

       Section 3.  Fees and Expenses. (a) Eagle will pay Seitel Fees for the
Services provided by Seitel to Eagle hereunder equal to Seitel's cost of
providing such Services, as reasonably determined by Seitel.  Such Fees will
include an allocation of Seitel's general and administrative overhead expense
relating to such Services.   Seitel may, but shall not be obligated to,
determine such cost using the same methods employed by Seitel to allocate costs
to Eagle for such Services prior to the IPO.

       (b)    Eagle will reimburse Seitel for Expenses incurred by Seitel in
connection with the provision of the Services.  Seitel will not have any
obligation to advance funds on behalf of Eagle.
<PAGE>   3
       (c)    Seitel will invoice Eagle for the Fees and the Expenses at
intervals determined by Seitel from time to time. All invoices will be due and
payable within five calendar days after the date of the invoice, and may be
paid by Seitel on behalf of Eagle pursuant to the authority granted in Section
7 hereof.

       (d)    Eagle may dispute any Fee or Expense by notifying Seitel of the
dispute within 30 calendar days of the receipt of the related invoice. If
either Party determines that the dispute cannot be resolved by the Parties, the
dispute will be submitted to the Accountant.  The Accountant will make such
investigation of the Fees and Expenses as it deems necessary and will finally
determine the amount of the Fees and Expenses.  The fees and expenses of the
Accountant will be paid by Eagle unless the finally determined Fees and
Expenses are less than 90% of the disputed amount.

       Section 4. Information and Records.

       (a) Eagle will make available to Seitel on a timely basis all
information which is reasonably necessary for Seitel to provide the Services.

       (b)    Seitel will maintain records with respect to the Services which
are substantially similar to those maintained with respect to similar Services
provided for its own account, and will provide those records to Eagle upon
termination of this Agreement.

       Section 5.  Liability. (a) Seitel makes no express or implied warranty
with respect to the Services.

       (b)    Seitel will be liable to Eagle for any Loss suffered by Eagle as
a result of acts or omissions of Seitel or its Associates in connection with
the Services provided only if and to the extent that (i) the acts or omissions
constitute gross negligence or willful misconduct or (ii) the acts or omissions
would be covered by Seitel's insurance coverage under crime, fidelity or
fiduciary insurance (if any).  In any event, except to the extent covered by
Seitel's crime, fidelity or fiduciary insurance, (i) any claim for damages from
Seitel in connection with a Service provided will be limited to the amount of
fees charged with respect to the Service, and (ii) Seitel will not be liable to
Eagle for any incidental or consequential damages, lost profits or
opportunities, or exemplary or punitive damages.

       Section 6. Indemnity. Except as provided in Section 5(b), Eagle will
indemnify Seitel and its Associates and hold Seitel and its Associates harmless
from any and all Losses arising from, asserted against or associated with the
provision of Services by Seitel to Eagle.

       Section 7. Authority. (a) In providing the Services, Seitel may take
such actions, make such decisions and exercise such judgment on behalf of Eagle
as Seitel has taken, made or exercised in providing the same or similar
services on behalf of Eagle prior
<PAGE>   4
to the IPO.

       (b)    Prior to taking action on behalf of Eagle, Seitel will use
reasonable efforts to consult with appropriate officers or employees of Eagle
(i) in those circumstances under which Seitel would have consulted officers or
employees of Eagle prior to the IPO, and (ii) in any other circumstances
required under such reasonable rules and procedures as Eagle may adopt, from
time to time, after prior consultation with Seitel.

       Section 8. Force Majeure. Seitel will not be liable to Eagle for any
failure to comply with this Agreement caused, directly or indirectly, by a
Force Majeure Event.

       Section 9. Term. (a) This Agreement, and Seitel's obligation to provide
Services hereunder, shall expire 90 days after the date hereof.

       (b)    Eagle may terminate this agreement prior to expiration on 5 days
prior written notice to Seitel.

       (c)    Eagle's and Seitel's obligations pursuant to Sections 3, 5 and 6
of this Agreement will survive expiration and termination of the Agreement.

       Section 10.  Notices.  All notices, demands, requests, or other
communications which may be or are required to be given, served, or sent by a
Party pursuant to this Agreement will be in writing and will be (i) personally
delivered, (ii) mailed by first class, registered or certified mail, return
receipt requested, postage prepaid, (iii) sent by an internationally recognized
express delivery service or (iv) transmitted by facsimile, address as follows:

       (a)    if to Eagle:

              Eagle Geophysical, Inc.
              50 Briar Hollow Lane, 6th Floor West
              Houston, Texas 77027
              Attn: Jay N. Silverman
              Facsimile Number (713) 881-2801

       (b)    if to Seitel:

              Seitel, Inc.
              50 Briar Hollow Lane, 7th Floor West
              Houston, Texas 77027
              Attn: Debra D. Valice
              Facsimile Number (713) 881-2806

       Each Party may designate by notice in writing a new address or facsimile
number to which any notice may be given, served or sent. Each notice will be
deemed sufficiently given, served, sent or received when it is delivered to the
addressee, with an affidavit
<PAGE>   5
of personal delivery, the return receipt, the delivery receipt or when delivery
is refused by the addressee. Each notice or other communication sent by
facsimile will be deemed sufficiently given only if a copy of the notice or
communication is immediately sent by one of the methods specified in (i), (ii)
or (iii) above.

       Section 11.  Miscellaneous. (a) This Agreement sets forth the entire
agreement of the Parties with respect to the Services and supersedes all
previous agreements, understandings or negotiations with respect to the
Services.

       (b)    The rights and obligations set forth in this Agreement may be
amended, modified or supplemented only by a writing signed by each Party.

       (c)    A Party may waive a right under this Agreement only by a written
waiver signed by the Party. No failure to exercise or delay in exercising a
right under this Agreement will constitute a waiver of that right.

       (d)    If any provision of this Agreement is found invalid, illegal or
unenforceable, the provision will be ineffective only to the extent of the
invalidity, illegality or unenforceability, and the other provisions of this
Agreement will remain in full force and effect.

       (e)    A party may not assign its rights, and a Party may not delegate
its obligations, under this Agreement unless it first obtains the written
consent of all other Parties, provided, however, that Seitel may assign its
rights and delegate its obligations to any wholly-owned subsidiary of Seitel
without Eagle's consent. Any Party, in its discretion, may withhold consent to
any such assignment or delegation.

       (f)    Except as permitted under Subsection (e), this Agreement will not
inure to the benefit of any Person other than the Parties.

       (g)    This Agreement will be governed by and construed and enforced in
accordance with the internal laws of the State of Texas.

       (h)    This Agreement may be executed in counterparts.

       IN WITNESS WHEREOF, the Parties have caused this Agreement to be
executed on their behalf as of the date first above written.

                                                  SEITEL, INC.


                                                  By:                          
                                                      -------------------------
                                                  Name:
                                                  Title:

                                                  EAGLE GEOPHYSICAL, INC.


                                                  By:                          
                                                      -------------------------
                                                  Name:
                                                  Title:
<PAGE>   6
                                    EXHIBIT A

                                    SERVICES

A.     Accounting:

       1.     Establish/convert from consolidated general ledger to separate
              company general ledger on Seitel's current accounting system.
              (Seitel may outsource this service or hire temporary staff to
              perform this service at Eagle's cost, subject to Eagle's prior
              consent.  If such consent is requested by Seitel but not given by
              Eagle, Seitel will not be required to perform this service.)
       2.     Maintain a general ledger.
       3.     Furnish general bank account checks and reconcile general bank
              account.
       4.     Process vendor invoices and employee expense reports approved by
              Eagle for payment.
       5.     Input accounts receivable in accordance with instructions from
              Eagle personnel; post cash receipts; provide A/R aging as
              requested (not more often than once per week).
       6.     Maintain fixed asset records (acquisition-disposal-depreciation
              schedules).
       7.     Provide project profit and cost accounting statements.  
       8.     Provide quarterly financial information for use by Eagle
              personnel in preparing quarterly financial statements: percentage
              completion of projects to determine revenue and costs to be
              recognized; commission accruals; bonus calculations; trial
              balance; and financial statements of Eagle Geophysical Onshore,
              Inc.

B.     Payroll:

       1.     Maintain employee data base and input payroll information into
              ADP system.
       2.     Distribute payroll checks.


C.     Tax:

       1.     Prepare and file all state and federal income and sale/use tax
              returns with a due date during the Term.

D.     Benefits:

       1.     Administer 401(k) Plan.
       2.     Administer health and medical benefits plans.

<PAGE>   1
                                                                   EXHIBIT 10.26

                      AMENDED AND RESTATED PROMISSORY NOTE



U.S.$2,000,000.00
July 3, 1996


         FOR VALUE RECEIVED, after date, without grace, in the manner, on the
dates and in the amounts so herein stipulated, the undersigned, ENERGY RESEARCH
INTERNATIONAL, a Cayman Islands corporation ("Borrower"), 6 Pembroke Road,
Sevenoaks, Kent TN13 1XR, United Kingdom, acting by and through its duly
authorized officer, PROMISES TO PAY TO THE ORDER OF SEITEL, INC., a Delaware
corporation ("Lender"), 50 Briar Hollow Lane, 7th Floor West, Houston, Harris
County, Texas 77027, the sum of TWO MILLION DOLLARS ($2,000,000.00) in lawful
money of the United States of America, which shall be legal tender in payment
of all debts and dues, public and private, at the time of payment, and to pay
interest on the unpaid principal amount from date until maturity at a varying
rate per annum which shall from day to day be equal to the lesser of (a) the
sum of the rate of interest per annum then most recently published by the Wall
Street Journal as the Prime Rate (hereinafter defined) in effect from
day-to-day, plus 1.0% ("Stated Rate"), each such change in the rate of interest
charged hereunder to become effective, without notice to Borrower, on the
effective date of each change in the Prime Rate, computed for the actual number
of days elapsed (including the first day, but excluding the last day), or (b)
the maximum non-usurious interest rate permitted by applicable law from time to
time in effect as such law may be interpreted, amended, revised, supplemented
or enacted ("Maximum Rate").  In the event the Stated Rate subsequently
decreases to a level which would be less than the Maximum Rate or if the
Maximum Rate applicable to this Note should subsequently be changed, then
interest hereon shall accrue at a rate equal to the applicable Maximum Rate
until the aggregate amount of interest so accrued equals the aggregate amount
of interest which would have accrued at the Stated Rate without regard to any
usury limit, at which time interest hereon shall again accrue at the Stated
Rate.  This Note is payable as follows:

                 Interest shall be due and payable monthly as it accrues, on
         the first day of each and every month, beginning August 1, 1996, and
         continuing regularly thereafter until July 3, 1998, when the entire
         balance of principal and accrued interest shall be due and payable.

                 In addition, Borrower shall be obligated to make mandatory
         prepayments of principal in amounts equal to 50% of the first $5
         Million in aggregate proceeds received by the Borrower upon the sale
         of any equity interests in the Borrower, and 100% of any aggregate
         proceeds in excess of $5 Million, which payments shall be due as and
         when such proceeds are received by the Borrower; provided, however,
         that such proceeds shall first be applied as mandatory prepayments
         under the Note made by Borrower payable to





________
Initials
<PAGE>   2
         the order of Lender dated November 15, 1996 in the original principal 
         amount of $2,679,040.00.

         It is agreed that time is of the essence of this agreement.  In the
event of default in the payment of any installment of principal or interest
when due or in the event of any other default hereunder, Lender may accelerate
and declare this Note immediately due and payable without notice and
opportunity to cure.  Any failure to exercise this option shall not constitute
a waiver by Lender of the right to exercise the same at any other time.

         In the event of default in the making of any payment herein provided,
either of principal or interest, or in the event this Note is declared due,
interest shall accrue at the Maximum Rate.

         Borrower hereby agrees to pay all expenses incurred, including
reasonable attorneys' fees, all of which shall become a part of the principal
hereof, if this Note is placed in the hands of an attorney for collection or if
collected by suit or through any probate, bankruptcy or any other legal
proceedings.

         Interest charges will be calculated on amounts advanced hereunder on
the actual number of days these amounts are outstanding on the basis of a
365-day or 366-day year, as is applicable.  It is the intention of the parties
hereto to comply with all applicable usury laws; accordingly, it is agreed that
notwithstanding any provision to the contrary in this Note, or in any of the
documents securing payment hereof or otherwise relating hereto, no such
provision shall require the payment or permit the collection of interest in
excess of the Maximum Rate.  If any excess of interest in such respect is
provided for, or shall be adjudicated to be so provided for, in this Note or in
any of the documents securing payment hereof or otherwise relating hereto, then
in such event (1) the provisions of this paragraph shall govern and control,
(2) neither Borrower, endorsers or guarantors, nor their heirs, legal
representatives, successors or assigns nor any other party liable for the
payment hereof, shall be obligated to pay the amount of such interest to the
extent that it is in excess of the Maximum Rate, (3) any such excess which may
have been collected shall be either applied as a credit against the then unpaid
principal amount hereof or refunded to Borrower, and (4) the provisions of this
Note and any documents securing payment of this Note shall be automatically
reformed so that the effective rate of interest shall be reduced to the Maximum
Rate.  For the purpose of determining the Maximum Rate, all interest payments
with respect to this Note shall be amortized, prorated and spread throughout
the full term of the Note so that the effective rate of interest on account of
this Note is uniform throughout the term hereof.

         Borrower agrees that the Maximum Rate to be charged or collected
pursuant to this Note shall be the applicable indicated rate ceiling as defined
in TEX. REV. CIV. STAT. ANN. Art. 5069-1.04, provided that Lender may rely on
other applicable laws, including without limitation laws of the United States,
for calculation of the Maximum Rate if the application thereof results in a
greater Maximum Rate.  Except as provided above, the provisions of this Note
shall be governed by the laws of the State of Texas.





________
Initials
                                     -2-
<PAGE>   3
         Each maker, surety, guarantor and endorser waives demand, grace,
notice, presentment for payment, notice of intention to accelerate the maturity
hereof, notice of acceleration of the maturity hereof and protest, and agrees
that this Note may be renewed, and the time of payment extended from time to
time, without notice and without releasing any of the foregoing.

         Borrower may prepay this Note, in whole or in part, at any time prior
to maturity without penalty, and interest shall cease on any amount prepaid.
Any partial prepayment shall be applied toward the payment of the principal
installments last maturing on the Note, that is, in the inverse order of
maturity, without reducing the amount or time of payment of the remaining
installments.

         As used in this Note, the term "Prime Rate" shall mean the variable
rate of interest published from time to time by the Wall Street Journal as the
Prime Rate of interest and, without notice to the maker of this Note or any
other person, such rate of interest shall change as and when changes in that
base rate of interest are published.  If at any time the "Prime Rate" is no
longer published by such publication, the owner of this Note ("Owner") will
designate as the "Prime Rate" a different variable rate of interest announced
by a national banking association of Owner's choice.

         Borrower agrees that all disputes in any way relating to, arising
under, connected with, or incident to this Note, and over which the United
States federal courts have subject matter jurisdiction, shall be litigated, if
at all, exclusively in the United States District Court for the Southern
District  of Texas, Houston Division, and, if necessary, the corresponding
appellate courts.  Borrower further agrees that all disputes in any way
relating to, arising under, connected with, or incident to this Agreement, and
over which the United States federal courts do not have subject matter
jurisdiction, shall be litigated, if at all, exclusively in the Courts of the
State of Texas, in Harris County, and, if necessary, the corresponding
appellate courts.  Borrower hereby submits itself to the personal jurisdiction
of, and consents to venue in, any such court, and hereby waives any claim it
may otherwise have that such court lacks personal jurisdiction over it, or that
such court is an inconvenient forum, with respect to any matter or proceeding
arising out of this Note.  Borrower further agrees to voluntarily appear and to
enter a general appearance in any proceeding arising out of this Note which is
brought in any such court.  Borrower agrees that service of process in any
matter or proceeding relating hereto may be effected upon it by certified or
registered mail to the address specified in the first paragraph of this Note or
such other address as Borrower may designate in writing to Lender from time to
time.

         This Note is an Amended and Restated Note that amends and restates
that certain promissory note dated July 3, 1996 made by Borrower payable to the
order of Lender in the same original principal amount.  Such original note has
been marked "Cancelled" and is replaced hereby.

                                        ENERGY RESEARCH INTERNATIONAL


                                        BY:  /s/ Gerald Harrison 
                                           -----------------------------
                                            Gerald Harrison, President





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                                     -3-

<PAGE>   1
                                                                  EXHIBIT 10.27 

                         P R O M I S S O R Y   N O T E



U.S.$2,679,040.00                                              November 15, 1996


         FOR VALUE RECEIVED, after date, without grace, in the manner, on the
dates and in the amounts so herein stipulated, the undersigned, ENERGY RESEARCH
INTERNATIONAL, a Cayman Islands corporation ("Borrower"), 6 Pembroke Road,
Sevenoaks, Kent TN13 1XR, United Kingdom, acting by and through its duly
authorized officer, PROMISES TO PAY TO THE ORDER OF SEITEL, INC., a Delaware
corporation ("Lender"), 50 Briar Hollow Lane, 7th Floor West, Houston, Harris
County, Texas 77027, the sum of TWO MILLION SIX HUNDRED SEVENTY-NINE THOUSAND
FORTY DOLLARS AND NO/100'S ($2,679,040.00) in lawful money of the United States
of America, which shall be legal tender in payment of all debts and dues,
public and private, at the time of payment, and to pay interest on the unpaid
principal amount from date until maturity at a varying rate per annum which
shall from day to day be equal to the lesser of (a) the maximum non-usurious
interest rate permitted by applicable law from time to time in effect as such
law may be interpreted, amended, revised, supplemented or enacted ("Maximum
Rate") or (b) the following rates (the "Stated Rate"):

                 From the date hereof until December 31, 1997, at five and
         35/100 percent (5.35%) per annum;

                 From January 1, 1998 until December 31, 1998, eight percent 
         (8%) per annum; and

                 From January 1, 1999 until maturity, the sum of the rate of
         interest per annum then most recently published by the Wall Street
         Journal as the Prime Rate (hereinafter defined) in effect from
         day-to-day, plus one percent (1.0%), each such change in the rate of
         interest charged hereunder to become effective, without notice to
         Borrower, on the effective date of each change in the Prime Rate,
         computed for the actual number of days elapsed (including the first
         day, but excluding the last day).

In the event the Stated Rate subsequently decreases to a level which would be
less than the Maximum Rate or if the Maximum Rate applicable to this Note
should subsequently be changed, then interest hereon shall accrue at a rate
equal to the applicable Maximum Rate until the aggregate amount of interest so
accrued equals the aggregate amount of interest which would have accrued at the
Stated Rate without regard to any usury limit, at which time interest hereon
shall again accrue at the Stated Rate.  This Note is payable as follows:

                 Payments of accrued interest and payments of $81,753.25 in
         principal shall be payable quarterly on the last day of each March,
         June, September and December,





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<PAGE>   2
         beginning on March 31, 1999, until December 31, 2001, provided that,
         if making such quarterly payments would cause a default under the
         agreements governing the debt owed by the Company's subsidiary Horizon
         Exploration Limited to the Bank of N.T. Butterfield & Sons, Ltd., such
         payments shall be deferred until the sooner of such time as they can
         be made without causing such default or until maturity, and provided
         further that, if making such payments would cause such a default, the
         Company and its subsidiaries shall use their best efforts to obtain
         waivers of such potential default or to refinance such debt so as to
         allow such payments to be made; and

                 On December 31, 2001, the entire balance of principal and
         accrued interest shall be due and payable.

                 In addition, Borrower shall be obligated to make mandatory
         prepayments of principal in amounts equal to 50% of the first $5
         Million in aggregate proceeds received by the Borrower upon the sale
         of any equity interests in the Borrower, and 100% of any aggregate
         proceeds in excess of $5 Million, which payments shall be due as and
         when such proceeds are received by the Borrower, and which shall be
         applied toward the payment of the principal installments last maturing
         on the Note, that is, in the inverse order of maturity, without
         reducing the amount or time of payment of the remaining installments.

         It is agreed that time is of the essence of this agreement.  In the
event of default in the payment of any installment of principal or interest
when due or in the event of any other default hereunder, Lender may accelerate
and declare this Note immediately due and payable without notice and
opportunity to cure.  Any failure to exercise this option shall not constitute
a waiver by Lender of the right to exercise the same at any other time.

         In the event of default in the making of any payment herein provided,
either of principal or interest, or in the event this Note is declared due,
interest shall accrue at the Maximum Rate.

         Borrower hereby agrees to pay all expenses incurred, including
reasonable attorneys' fees, all of which shall become a part of the principal
hereof, if this Note is placed in the hands of an attorney for collection or if
collected by suit or through any probate, bankruptcy or any other legal
proceedings.

         Interest charges will be calculated on amounts advanced hereunder on
the actual number of days these amounts are outstanding on the basis of a
365-day or 366-day year, as is applicable.  It is the intention of the parties
hereto to comply with all applicable usury laws; accordingly, it is agreed that
notwithstanding any provision to the contrary in this Note, or in any of the
documents securing payment hereof or otherwise relating hereto, no such
provision shall require the payment or permit the collection of interest in
excess of the Maximum Rate.  If any excess of interest in such respect is
provided for, or shall be adjudicated to be so provided for, in this Note or in
any of the documents securing payment hereof or otherwise relating hereto, then
in such event (1) the provisions of this paragraph shall govern and control,
(2) neither Borrower, endorsers or guarantors, nor their heirs, legal
representatives, successors or assigns nor any other





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                                     -2-
<PAGE>   3
party liable for the payment hereof, shall be obligated to pay the amount of
such interest to the extent that it is in excess of the Maximum Rate, (3) any
such excess which may have been collected shall be either applied as a credit
against the then unpaid principal amount hereof or refunded to Borrower, and
(4) the provisions of this Note and any documents securing payment of this Note
shall be automatically reformed so that the effective rate of interest shall be
reduced to the Maximum Rate.  For the purpose of determining the Maximum Rate,
all interest payments with respect to this Note shall be amortized, prorated
and spread throughout the full term of the Note so that the effective rate of
interest on account of this Note is uniform throughout the term hereof.

         Borrower agrees that the Maximum Rate to be charged or collected
pursuant to this Note shall be the applicable indicated rate ceiling as defined
in TEX. REV. CIV. STAT. ANN. Art. 5069-1.04, provided that Lender may rely on
other applicable laws, including without limitation laws of the United States,
for calculation of the Maximum Rate if the application thereof results in a
greater Maximum Rate.  Except as provided above, the provisions of this Note
shall be governed by the laws of the State of Texas.

         Each maker, surety, guarantor and endorser waives demand, grace,
notice, presentment for payment, notice of intention to accelerate the maturity
hereof, notice of acceleration of the maturity hereof and protest, and agrees
that this Note may be renewed, and the time of payment extended from time to
time, without notice and without releasing any of the foregoing.

         Borrower may prepay this Note, in whole or in part, at any time prior
to maturity without penalty, and interest shall cease on any amount prepaid.
Any partial prepayment shall be applied toward the payment of the principal
installments last maturing on the Note, that is, in the inverse order of
maturity, without reducing the amount or time of payment of the remaining
installments.

         As used in this Note, the term "Prime Rate" shall mean the variable
rate of interest published from time to time by the Wall Street Journal as the
Prime Rate of interest and, without notice to the maker of this Note or any
other person, such rate of interest shall change as and when changes in that
base rate of interest are published.  If at any time the "Prime Rate" is no
longer published by such publication, the owner of this Note ("Owner") will
designate as the "Prime Rate" a different variable rate of interest announced
by a national banking association of Owner's choice.

         Borrower agrees that all disputes in any way relating to, arising
under, connected with, or incident to this Note, and over which the United
States federal courts have subject matter jurisdiction, shall be litigated, if
at all, exclusively in the United States District Court for the Southern
District  of Texas, Houston Division, and, if necessary, the corresponding
appellate courts.  Borrower further agrees that all disputes in any way
relating to, arising under, connected with, or incident to this Agreement, and
over which the United States federal courts do not have subject matter
jurisdiction, shall be litigated, if at all, exclusively in the Courts of the
State of Texas, in Harris County, and, if necessary, the corresponding
appellate courts.  Borrower hereby submits itself to the personal jurisdiction
of, and consents to venue in, any such court, and hereby waives any claim it
may otherwise have that such court lacks personal jurisdiction over it, or that





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                                     -3-
<PAGE>   4
such court is an inconvenient forum, with respect to any matter or proceeding
arising out of this Note.  Borrower further agrees to voluntarily appear and to
enter a general appearance in any proceeding arising out of this Note which is
brought in any such court.  Borrower agrees that service of process in any
matter or proceeding relating hereto may be effected upon it by certified or
registered mail to the address specified in the first paragraph of this Note or
such other address as Borrower may designate in writing to Lender from time to
time.


                                        ENERGY RESEARCH INTERNATIONAL


                                        BY:  /s/ Gerald Harrison 
                                           --------------------------------
                                                 Gerald Harrison, President





                                     -4-

<PAGE>   1
                                                                   EXHIBIT 10.29


                             EAGLE GEOPHYSICAL, INC.                           
                               OUTSIDE DIRECTORS'
                           DEFERRED COMPENSATION PLAN



         1.      Purpose.  The purpose of the Outside Directors' Deferred
Compensation Plan (the "Plan") of Eagle Geophysical, Inc., a Delaware
corporation (the "Company"), is to attract and retain highly qualified persons
who are not employees of the Company to serve as Directors of the Company by
providing such Directors with greater flexibility in the timing of receipt of
fees for services on the Board of Directors, and an opportunity to obtain a
greater proprietary interest in the Company's success and progress through
deferral of fees as if such fees had been invested in Common Stock of the
Company, thereby aligning such Directors' interests more closely with the
interests of stockholders of the Company.

         2.      Definitions.  In addition to terms defined elsewhere in the
Plan, the following are defined terms under the Plan:

                 (a)      "Account" means the account established under
         Sections 6 and 7 for Participants, which may include, as subaccounts,
         an Interest Bearing Account and a Stock Appreciation Account.  Such
         Accounts are maintained solely as bookkeeping entries by the Company
         evidencing unfunded obligations of the Company.

                 (b)      "Board" means the Board of Directors of the Company.

                 (c)      "Common Stock" means the Common Stock, $.01 par
         value, of the Company and such other securities as may be substituted
         for such Common Stock or such other securities pursuant to Section 9.

                 (d)      "Director Fees" means annual director fees payable to
         a Director in his or her capacity as such for service on the Board and
         meeting fees payable to a Director for his or her participation in
         meetings of the Board or any committee thereof.

                 (e)      "Exchange Act" means the Securities Exchange Act of
         1934, as amended.  References to any provision of the Exchange Act
         include rules thereunder and successor provisions and rules thereto.

                 (f)      "Fair Market Value" of a share of Common Stock of the
         Company means, as of any given date, the closing sales price of a
         share of Common Stock reported by the Nasdaq Stock Market's National
         Market or such other stock exchange on which the Stock is listed;
         provided that the Fair Market Value of Stock on the effective date of
         the Plan will be the initial public offering price of the Stock.

                 (g)      "Participant" means a person who has amounts credited
         to his or her Account, or who has elected to defer payment of Director
         Fees under the Plan.

                 (h)      "Plan Year" means, with respect to a Participant, the
         period commencing at the time of election of the Director at an annual
         meeting of stockholders (or the
<PAGE>   2
         election of a class of Directors if the Company then has a classified
         Board), or the Director's initial appointment to the Board if not at
         an annual meeting of stockholders, and continuing until the next
         annual meeting of stockholders.

                 (i)      "Stock Appreciation Right" means a credit to a
         Participant's Stock Appreciation Account under Section 7 which
         represents the right to receive the Fair Market Value of one share of
         Common Stock of the Company upon settlement of the Account.

                 (j)      "Valuation Date" means the last business day of a
         Plan Year and the last business day preceding a date on which a
         distribution is made in settlement of a Participant's Account.

         3.      Administration of the Plan.  The Plan will be administered by
the Board; provided, however, that any action by the Board relating to the Plan
will be taken only if, in addition to any other required vote, such action is
approved by the affirmative vote of a majority of the Directors who are not
then eligible to participate in the Plan.  Subject to the direction of the
Board, bookkeeping and other ministerial functions under the Plan shall be
performed by the Secretary of the Company.

         4.      Eligibility.  Each Director of the Company who is paid
Director Fees for service on the Board may participate in the Plan.  No person
other than those specified in this Section 5 will be eligible to participate in
the Plan.

         5.      Elections Relating to Participation.  Each Director of the
Company who is eligible under Section 4 may elect, in accordance with this
Section 5, to defer receipt of Director Fees.  Such deferred Director Fees will
either bear interest in an Interest Bearing Account under Section 6 or be
treated as if invested in Common Stock in a Stock Appreciation Account under
Section 7.

                 (a)      Time of Filing of Elections; Irrevocability.  A
         Director shall elect to participate and the terms of such
         participation by filing an election with the Secretary of the Company
         prior to the beginning of a Plan Year (which generally will begin at
         each annual meeting of the stockholders).  Elections shall be deemed
         continuing, and therefore applicable to Plan Years after the initial
         Plan Year, until the election is modified or revoked by the
         Participant.  Elections other than those subject to Section 5(d) shall
         become irrevocable at the commencement of the Plan Year to which an
         election relates.  Elections relating to the time of settlement of an
         Interest Bearing Account or a Stock Appreciation Account shall become
         irrevocable at the time specified in Section 5(d).  Elections may be
         modified or revoked by filing a new election prior to the time the
         election to be modified or revoked has become irrevocable.  The latest
         election filed with the Secretary of the Company shall be deemed to
         revoke all prior inconsistent elections that remain revocable at the
         time of filing of the latest election.

                 (b)      Matters to be Elected.  A Director's election must
         specify the following:

                          (i)     With respect to Director Fees, the percentage
                 to be deferred and credited to the Participant's Interest
                 Bearing Account under Section 6 and the




                                     -2-
<PAGE>   3
                 percentage to be deferred and credited to the Participant's
                 Stock Appreciation Account under Section 7.  The sum of such
                 percentages must not exceed 100%; if such sum is less than
                 100%, the balance of Director Fees will be paid in accordance
                 with the Company's regular Director compensation policies.

                          (ii)    The period or periods during which settlement
                 of the Participant's Interest Bearing Account or Stock
                 Appreciation Account will be deferred, subject to Section
                 5(d), and whether distribution will be in a lump sum or in
                 annual installments; provided, however, that not more than ten
                 installments may be elected, and any installment distributions
                 must commence no later than the first business day of the Plan
                 Year following the Plan Year in which the Participant ceases
                 to serve as a Director.  An election as to the period or
                 periods in which such settlement will be deferred may relate
                 to a given Account in respect of such Plan Year and to any
                 additional amounts credited as interest or dividend
                 equivalents in respect of such originally credited amounts and
                 previously credited amounts.

                 (c)      Form of Election.  Elections under the Plan shall be
         made in writing on such form or forms as may be specified from time to
         time by the Secretary of the Company.

                 (d)      Modifying the Time of Settlement.  A Participant may
         modify an election as to the time at which a Participant's Account
         will be settled at any time prior to the earlier of (i) the calendar
         year in which a lump sum settlement will occur or the first
         installment will commence or (ii) the time the Participant ceases to
         serve as a Director of the Company, except that such modification may
         only extend the date of settlement to a date later than the previously
         elected settlement date.  Such modification shall be made by filing a
         new election with the Secretary of the Company.  The foregoing
         notwithstanding, the Secretary of the Company may disapprove or limit
         elections under this Section 5(d) in order to ensure that the
         Participant will not be deemed to have constructively received
         compensation in respect of the Participant's Account prior to
         settlement.

                 (e)      No Reallocation of Accounts.  Amounts credited to a
         Participant's Interest Bearing Account may not be reallocated or
         switched to the Participant's Stock Appreciation Account, and amounts
         credited to the Participant's Stock Appreciation Account may not be
         reallocated or switched to the Participant's Interest Bearing Account.

                 (f)      Cessation of Service as a Director.  If any Director
         Fees otherwise subject to an election would be paid to a Participant
         after he or she has ceased to serve as a Director, such payment shall
         not be subject to such election, but shall instead be paid in
         accordance with the Company's regular non-employee Director
         compensation policies.

         6.      Deferral of Director Fees in Interest Bearing Account.  If a
Participant has elected to defer receipt of a specified amount of Director Fees
to be held in his or her Interest Bearing Account, an amount equal to such
specified amount shall be credited to the Participant's Interest Bearing
Account as of the date such Director Fees otherwise would have been payable to
the Participant but for such election to defer.  As of the close of business on
each Valuation Date,





                                    - 3 -
<PAGE>   4
interest shall be credited to such Cash Account in an amount equal to the
average daily balance in such Cash Account since the last Valuation Date
multiplied by a rate of interest equal to the prime interest rate as published
in THE WALL STREET JOURNAL and effective on the date of the last preceding
annual meeting of stockholders of the Company minus 1.5%.

         7.      Deferral of Director Fees in Stock Appreciation Account.  If a
Participant has elected to defer receipt of a specified amount of Director Fees
to be held in his or her Stock Appreciation Account, a number of Stock
Appreciation Rights determined in accordance with this Section 7 shall be
credited to the Participant's Stock Appreciation Account as of the date such
Director Fees otherwise would have been payable to the Participant but for such
election to defer.  The number of Stock Appreciation Rights that shall be
credited to a Participant's Stock Appreciation Account shall be determined by
dividing the amount of Director Fees to be deferred as of the date of such
deferral by the Fair Market Value of one share of Common Stock determined at
the close of business on the day the applicable Plan Year commenced.  The
amount of Stock Appreciation Rights credited to a Participant's Stock
Appreciation Account shall include fractional Stock Appreciation Rights
calculated to at least three decimal places.

                 (a)      Crediting of Dividend Equivalents - Cash and
         Non-Share Dividends.  If the Company declares and pays a dividend in
         the form of cash or property other than Common Stock in respect of
         shares of Common Stock, then a number of additional Stock Appreciation
         Rights shall be credited to the Stock Appreciation Account as of the
         payment date for such dividend equal to (i) the number of Stock
         Appreciation Rights credited to such Account as of the record date for
         such dividend, multiplied by (ii) the amount of cash plus the fair
         market value, as determined by the Board, of any property other than
         shares of Common Stock actually paid as a dividend on each share of
         Common Stock at such payment date, divided by (iii) the Fair Market
         Value of one share of Common Stock determined at the close of business
         on the day the applicable Plan Year commenced.

                 (b)      Crediting of Dividend Equivalents - Share Dividends.
         If the Company declares and pays a dividend in the form of additional
         shares of Common Stock payable in respect of shares of Common Stock,
         then a number of additional Stock Appreciation Rights shall be
         credited to the Participant's Stock Appreciation Account as of the
         payment date for such dividend equal to (i) the number of Stock
         Appreciation Rights credited to such Account as of the record date for
         such dividend multiplied by (ii) the number of additional shares of
         Common Stock actually paid as a dividend in respect of each share of
         Common Stock.

         8.      Settlement of Accounts.  The Company will settle a
Participant's Account by making one or more distributions to the Participant
(or his or her designated beneficiary, upon the Participant's death) at the
time or times, in a lump sum or installments, as specified in the Participant's
election filed in accordance with Section 5; provided, however, that Accounts
will be settled at times earlier than those specified in such election in
accordance with Sections 8(b), 8(c), and 9.

                 (a)      Form of Distribution.  Distributions in respect of a
         Participant's Interest Bearing Account and Stock Appreciation Account
         shall be made only in cash.  Distributions in respect of a
         Participant's Stock Appreciation Account shall be equal to





                                    - 4 -
<PAGE>   5
         the number of Stock Appreciation Rights to be distributed multiplied
         by the Fair Market Value of one share of Common Stock on the business
         day immediately preceding the date of such distribution.

                 (b)      Termination of Service as a Director; Death.

                          (i)     Cessation of Service Other than Due to Death.
                 If a Participant ceases to serve as a Director due to any
                 reason other than death, the Company shall make distributions
                 in respect of the Participant's Account to such Participant in
                 a lump sum or installments, as previously elected by the
                 Participant, except that installment payments shall commence
                 not later than the first business day of the calendar year
                 following the calendar year in which the Participant ceases to
                 serve as a Director.

                          (ii)    Death.  If a Participant ceases to serve as a
                 Director due to death or dies prior to distribution of all
                 amounts from his or her Account, the Company shall make a
                 single lump sum distribution to the beneficiary designated by
                 such Participant in his or her most recent beneficiary
                 designation form filed with the Secretary of the Company.  If
                 there is no beneficiary designation on file with the Secretary
                 of the Company at the time of the Participant's death or no
                 surviving designated beneficiary, such distributions shall be
                 made to the executor or administrator of the Director's
                 estate.  Any such distribution shall be made as soon as
                 practicable following notification to the Company of the
                 Participant's death.

                 (c)      Financial Hardship.  Other provisions
         notwithstanding, at the written request of a Participant or his or her
         legal representative, the Board, in its sole discretion, upon a
         finding that continued deferral will result in financial hardship to
         the Participant, may authorize (i) the distribution of all or a part
         of a Participant's Account in a single installment or (ii) the
         acceleration of payment of any multiple installments thereof.

         9.      Adjustment Provisions.  In the event any recapitalization,
reorganization, merger, consolidation, spin- off, combination, repurchase,
exchange of Common Stock or other securities of the Company, stock split or
reverse split, liquidation, dissolution, or other similar corporate transaction
or event affects the Common Stock such that an adjustment is determined by the
Board to be appropriate in order to prevent dilution or enlargement of a
Participant's rights under the Plan, then an adjustment shall be made, in a
manner that is proportionate to the change to the Common Stock and otherwise
equitable, in the number and kind of Stock Appreciation Rights in a
Participant's Stock Appreciation Account.  Upon the effective date of the
dissolution or liquidation of the Company, or of a reorganization, merger, or
consolidation of the Company with one or more other corporations in which the
Company is not the surviving corporation, or of the transfer of substantially
all of the assets or shares of the Company to another corporation, the Plan
shall terminate and all distributions shall be completed five business days
before the scheduled completion of such corporate event unless provision is
made in writing in connection with such corporate event for the continuance of
the Plan and for the assumption of Accounts maintained under the Plan
immediately prior to the effectiveness of such corporate event.





                                    - 5 -
<PAGE>   6
         10.     Changes to the Plan.  The Board may amend, alter, suspend,
discontinue, or terminate the Plan without the consent of stockholders or
Participants; provided, however, that, without the consent of an affected
Participant, no such action may materially impair the rights of such
Participant with respect to any previously deferred Director Fees.

         11.     General Provisions.

                 (a)      Agreements; Account Statements.  The rights or
         obligations under the Plan may be evidenced by Agreements or other
         documents executed by the Company and the Participant incorporating
         the terms and conditions set forth in the Plan, together with such
         other terms and conditions not inconsistent with the Plan, as the
         Board may from time to time approve.  The Secretary of the Company
         shall provide each Participant, not less frequently than once per Plan
         Year, with an account statement reflecting Account balances under the
         Plan, Account transactions during the period covered by the statement,
         and such other information as the Secretary of the Company may deem
         relevant.

                 (b)      Limitations on Transferability.  Rights under the
         Plan will not be transferable by a Participant except by will or the
         laws of descent and distribution, or to a designated beneficiary in
         the event of a Participant's death, except with the prior consent of
         the Board.  The Company may rely upon the beneficiary designation last
         filed in accordance with Section 8(b).

                 (c)      Nonforfeitability.  The interest of each Participant
         in his or her Account shall be nonforfeitable.

                 (d)      Continued Service as an Employee.  If a Participant
         ceases to serve as a Director and, immediately thereafter, is employed
         by the Company or any subsidiary of the Company, then such Participant
         will not be deemed to have ceased to serve as a Director at that time
         for the purposes of Section 8(b)(1) of this Plan, and his or her
         continued employment by the Company or any subsidiary will be deemed
         to be continued service as a Director for the purposes of Section
         8(b)(1) of this Plan only.

                 (e)      No Right to Continue as a Director.  Nothing
         contained in the Plan or any Agreement will confer upon any
         Participant any right to continue to serve as a Director of the
         Company or to be nominated for re-election as a Director.

                 (f)      No Stockholder Rights Conferred.  Nothing contained
         in the Plan or any Agreement will confer upon any Participant (or any
         person claiming rights by or through a Participant) any rights of a
         stockholder of the Company.

                 (g)      Unfunded Status of Accounts.  The Plan is intended to
         constitute an "unfunded" plan to provide deferred compensation.  With
         respect to any rights to payment of a Participant under his or her
         Account, nothing contained in the Plan or any Agreement shall give any
         such Participant any rights that are greater than those of a general
         creditor of the Company.





                                    - 6 -
<PAGE>   7
                 (h)      Nonexclusivity of the Plan.  The adoption of the Plan
         by the Board shall not be construed as creating any limitations on the
         power of the Board to adopt such other compensatory arrangements for
         Directors as it may deem desirable.

                 (i)      Governing Law.  The validity, construction, and
         effect of the Plan and any Agreement will be determined in accordance
         with the laws of the State of Delaware and applicable federal law.





                                    - 7 -

<PAGE>   1
                                                                   EXHIBIT 10.30


                            EAGLE GEOPHYSICAL, INC.
                             INDEPENDENT DIRECTORS'
                               STOCK OPTION PLAN


     1.   Purpose.  The purpose of this Independent Directors' Stock Option
Plan (the "Plan") of Eagle Geophysical, Inc. (the "Company") is to promote
ownership by Independent Directors of a greater proprietary interest in the
Company, thereby aligning such Directors' interests more closely with the
interests of stockholders of the Company, and to assist the Company in
attracting and retaining qualified persons to serve as independent Directors.

     2.   Definitions.  In addition to terms defined elsewhere in the Plan, the
following are defined terms under the Plan:

          (a)       "Code" means the Internal Revenue Code of 1986, as amended.
     References to any provision of the Code include regulations thereunder and
     successor provisions and regulations.

          (b)       "Exchange Act" means the Securities Exchange Act of 1934,
     as amended.  References to any provision of the Exchange Act include rules
     thereunder and successor provisions and rules.

          (c)       "Fair Market Value" of Stock means the closing price of the
     Stock on the date on which such value is to be determined, as reported for
     such day by the Nasdaq Stock Market's National Market or such other stock
     exchange on which the Stock is listed; provided that the Fair Market Value
     of Stock on the effective date of the Plan will be the initial public
     offering price of the Stock.

          (d)       "Independent Director" means a Director of the Company who
     is not, and has not been during the preceding three months, an employee of
     the Company or any parent or subsidiary of the Company, and who is not
     entitled to receive any compensation from the Company or any of its
     subsidiaries other than (i) directors' fees, (ii) meeting fees, (iii)
     reimbursement of expenses incurred in connection with such director
     position, and (iv) Options under this Plan.

          (e)       "Option" means the right, granted to a Participant under
     Sections 6 or 7, to purchase Stock at the specified exercise price for a
     specified period of time under the Plan.

          (f)       "Participant" means a Director who is eligible to receive
     and is granted Options under the Plan.

          (g)       "Stock" means the Common Stock, $.01 par value, of the
     Company and such other securities as may be substituted for Stock or such
     other securities pursuant to Section 8.
<PAGE>   2
     3.   Shares Available Under the Plan.  The total number of shares of Stock
reserved and available for delivery under the Plan is 100,000, subject to
adjustment as provided in Section 8 below.  Such shares may be authorized but
unissued shares or treasury shares.  If any Option expires or terminates for
any reason without having been exercised in full, the shares remaining subject
to such Option will again be available for delivery under the Plan.

     4.   Administration of the Plan.  The Plan will be administered by the
Board of Directors of the Company; provided, however, that any action by the
Board of Directors relating to the Plan will be taken only if, in addition to
any other required vote, such action is approved by the affirmative vote of a
majority of the Directors who are not then eligible to participate under the
Plan.

     5.   Eligibility.  Each Director of the Company who, on any date on which
an Option is to be granted hereunder, is an Independent Director will be
eligible to receive a grant of an Option at such date.  No person other than
those specified in this Section 5 will participate in the Plan.

     6.   Stock Options.  An option to purchase 5,000 shares of Stock will be
granted under the Plan to each person who is an existing Independent Director
of the Company on the effective date of the Plan.  Additionally, an option to
purchase 5,000 shares of Stock will be granted under the Plan to each person
who, after the effective date of the Plan, is first elected or appointed to
serve as a Director of the Company, such grant to be effective at the date of
such first selection or appointment, if such Director is then eligible to
receive an Option grant.  Also, an Option to purchase 5,000 shares of Stock
will be granted each year to each Director of the Company who is then eligible
to receive an Option grant at the close of business on the day of the Company's
annual meeting of stockholders at which Directors (or a class of Directors if
the Company then has a classified Board of Directors) are elected or reelected
by the Company's stockholders.  The foregoing notwithstanding, no Director may
be granted an Option more than once during any one calendar year under the
Plan.  No further Options will be granted under the Plan when the remaining
number of shares of Stock reserved for issuance under the Plan upon the
exercise of Options granted under the Plan becomes insufficient to grant
Options as otherwise required by the Plan.  Options granted under the Plan will
be non-qualified stock options which will be subject to the following terms and
conditions:

          (a)       Exercise Price.  The exercise price per share of Stock
     purchasable under an Option will be equal to 100% of the Fair Market Value
     of Stock on the date of grant of the Option.

          (b)       Option Term.  Each Option will expire at the earlier of (i)
     five years after the date of grant, (ii) twelve months after the
     Participant ceases to serve as a Director of the Company due to death,
     disability, or retirement at or after age 65, or (iii) sixty days after
     the Participant ceases to serve as a Director of the Company for any
     reason other than death, disability, or retirement at or after age 65.


                                      2
<PAGE>   3
          (c)       Exercisability.  Each Option will become fully exercisable
     beginning one year after the date of grant, and will thereafter remain
     exercisable until the Option expires; provided, however, that an Option
     previously granted to a Participant will be exercisable after the
     Participant ceases to serve as a Director of the Company for any reason
     other than death, disability, or retirement at or after age 65 only if the
     Option was exercisable at the date of such cessation of service.

          (d)       Method of Exercise.  Each Option may be exercised, in whole
     or in part, at such time as it is exercisable and prior to its expiration
     by giving written notice of exercise to the Company specifying the Option
     to be exercised and the number of shares to be purchased, and accompanied
     by payment in full of the exercise price in cash (including by check) or
     by surrender of shares of Stock of the Company acquired by the Participant
     prior to the exercise date and having a Fair Market Value at the time of
     exercise equal to the exercise price, or a combination of a cash payment
     and surrender of such Stock.

     7.   Initial Grant to Chairman.  Notwithstanding anything herein to the
contrary, William L. Lurie, Chairman of the Board of Directors of the Company,
will be granted upon the effective date of the Plan an initial grant of options
to purchase 25,000 shares of Stock in lieu of the automatic grant of options to
purchase 5,000 shares upon the effective date of the Plan.  Such options shall
vest in cumulative installments of one- third of the number of shares subject
thereto on each of the first, second and third anniversaries of the effective
date of the Plan and will expire on the tenth anniversary of the date of grant,
subject to earlier expiration 12 months after Mr. Lurie ceases to be a director
for any reason.  The exercise price and method of exercise of such Options
shall be as set forth in paragraphs 6(a) and (d) above.

     8.   Adjustment Provisions.  In the event any recapitalization,
reorganization, merger, consolidation, spin-off, combination, repurchase,
exchange of shares or other securities of the Company, stock split or reverse
split, extraordinary dividend having a value in excess of 150% of the quarterly
dividends paid during the preceding twelve-month period, liquidation,
dissolution, or other similar corporate transaction or event affects Stock such
that an adjustment is determined by the Board of Directors to be appropriate in
order to prevent dilution or enlargement of Participants' rights under the
Plan, then the Board of Directors will, in a manner that is proportionate to
the change to the Stock and is otherwise equitable, adjust (i) any or all of
the number or kind of shares of Stock reserved for issuance and delivery under
the Plan, (ii) the number or kind of shares of Stock to be subject to each
automatic grant of Options under Section 6, and (iii) the number and kind of
shares of Stock issuable or deliverable upon exercise of outstanding Options,
and/or the exercise price per share thereof (provided that no fractional shares
will be issued upon exercise of any Option).  The foregoing notwithstanding, no
adjustment may be made hereunder except as shall be necessary to preserve,
without exceeding, the value of outstanding Options and potential grants of
Options.  If at any date an insufficient number of shares are available for the
automatic grant of Options at that date, Options will be automatically granted
under Section 6 proportionately to Participants to the extent shares are
available.





                                       3
<PAGE>   4
     9.   Changes to the Plan.  The Board of Directors may amend, alter,
suspend, discontinue, or terminate the Plan or authority to grant Options under
the Plan without the consent of stockholders or Participants, except that any
such action will be subject to the approval of the Company's stockholders at
the next annual meeting of stockholders having a record date after the date
such action was taken if such stockholder approval is required by any federal
or state law or regulation or the rules of any automated quotation system or
stock exchange on which the Stock may then be quoted or listed, or if the Board
of Directors determines in its discretion to seek such stockholder approval;
provided, however, that, without the consent of an affected Participant, no
such action may materially impair the rights of such Participant with respect
to any previously granted Option.

     10.  General Provisions.

          (a)       Consideration for Grants; Agreements.  Options will be
     granted under the Plan in consideration of the services of the
     Participants and, except for the payment of the Option exercise price upon
     exercise of the options, no other consideration shall be required
     therefor.  Grants of Options will be evidenced by agreements executed by
     the Company and the Participant containing the terms and conditions set
     forth in the Plan together with such other terms and conditions not
     inconsistent with the Plan as the Board of Directors may from time to time
     approve.

          (b)       Compliance with Laws and Obligations.  The Company will not
     be obligated to issue or deliver Stock in connection with any Option in a
     transaction subject to the registration requirements of the Securities Act
     of 1933, as amended, or any state securities law, any requirement under
     any listing agreement between the Company and any automated quotation
     system or national securities exchange, or any other law, regulation or
     contractual obligation, until the Company is satisfied that such laws,
     regulations, and other obligations of the Company have been complied with
     in full.  Certificates representing shares of Stock delivered under the
     Plan will be subject to such stop-transfer orders and other restrictions
     as may be applicable under such laws, regulations, and other obligations
     of the Company, including any requirement that a legend or legends be
     placed thereon.

          (c)       Non-transferability.  Options and any other right under the
     Plan that may constitute a "derivative security" as generally defined in
     Rule 16a-1(c) under the Exchange Act will not be transferable by a
     Participant except by will or the laws of descent and distribution (or to
     a designated beneficiary in the event of a Participant's death), and will
     be exercisable during the lifetime of a Participant only by such
     Participant or his or her guardian or legal representative.

          (d)       Compliance with Rule 16b-3.  It is the intent of the
     Company that this Plan comply in all respects with applicable provisions
     of Rule 16b-3 under the Exchange Act in connection with any grant of
     Options to a Participant.  Accordingly, this Plan and the grants to be
     made hereunder shall be made under a formula plan as referred to in Note





                                       4
<PAGE>   5
     (3) to Rule 16b-3.  If any provision of this Plan or any agreement
     hereunder does not comply with the requirements of Rule 16b-3 as then
     applicable to any such grant to a Participant, such provision will be
     construed or deemed amended to the extent necessary to conform to such
     requirements with respect to such Participant.  In addition, the Board of
     Directors shall have no authority to make any amendment, alteration,
     suspension, discontinuation, or termination of the Plan or any agreement
     hereunder, to make any adjustment under Section 8, or take other action if
     and to the extent such authority would cause a Participant's transactions
     under the Plan not to be exempt under Rule 16b-3 under the Exchange Act.

          (e)       Continued Service as an Employee.  If a Participant ceases
     to serve as a Director and, immediately thereafter, is employed by the
     Company or any subsidiary of the Company, then solely for purposes of
     Sections 6(b) and (c) of the Plan, such Participant will not be deemed to
     have ceased service as a Director at that time, and his or her continued
     employment by the Company or any subsidiary will be deemed to be continued
     service as a Director; provided, however, that such former Director will
     not be eligible for additional grants of Options under the Plan.

          (f)       No Right to Continue as a Director.  Nothing contained in
     the Plan or any agreement hereunder will confer upon any Participant any
     rights to continue to serve as a Director of the Company or to be
     nominated for re-election as a Director.

          (g)       No Stockholder Rights Conferred.  Nothing contained in the
     Plan or any agreement hereunder will confer upon any Participant any
     rights of a stockholder of the Company unless and until an Option is duly
     exercised hereunder.

          (h)       Governing Law.  The validity, construction, interpretation
     and effect of the Plan and all rights of any of the persons having or
     claiming to have any interest in the Plan shall be governed by the laws of
     the State of Delaware.

     11.  Effective Date and Duration of Plan.  The Plan will be effective upon
consummation of the initial public offering of the Company's Stock.  Unless
earlier terminated by action of the Board of Directors, the Plan will remain in
effect until such time as no Stock remains available for issuance or delivery
under the Plan and the Company has no further rights or obligations with
respect to outstanding Options under the Plan.





                                       5

<PAGE>   1
                                                                   EXHIBIT 10.31

                             1997 STOCK OPTION PLAN
                            EAGLE GEOPHYSICAL, INC.


         Eagle Geophysical, Inc., a Delaware corporation (the "Company"),
hereby establishes and adopts the following 1997 Stock Option Plan (the
"Plan"):

                                  I.  PURPOSE

         The Plan is intended as an employment incentive, to retain in the
employment of the Company and its subsidiaries persons of experience and
ability, to attract new employees whose services are considered unusually
valuable, to encourage the sense of proprietorship of such persons, and to
stimulate the active interest of such persons in the development and financial
success of the Company.

                                II.  DEFINITIONS

         As used in this Plan, the following words and phrases shall have the
following meanings:

                 (1)      Board of Directors or "Board" shall mean the Board of
                          Directors of the Company.

                 (2)      Code shall mean the Internal Revenue Code of 1986, as
                          amended.

                 (3)      Committee shall mean the Compensation Committee of
         the Board or such other committee of the Board designated by the Board
         to administer the Plan as provided herein.

                 (4)      Company means Eagle Geophysical, Inc. and any
         successor thereto by merger, consolidation, liquidation or other
         reorganization which has made provision for adoption of the Plan and
         the assumption of the Company's obligations hereunder.

                 (5)      Eligible Employee shall mean any person who is
         employed by the Company or a Subsidiary, including, but not limited
         to, any employee who is also an officer and director of the Company or
         a Subsidiary, but not including any director who serves on the
         Committee.

                 (6)      Fair Market Value of a share of Common Stock of the
         Company shall mean the closing sales price per share of such stock as
         reported in the Wall Street Journal (or any other nationally
         recognized newspaper or other source should such price not be
         published in the Wall Street Journal) as of the applicable date.

                 (7)      Options shall mean the Incentive Stock Options and
         the Non-Qualified Stock Options granted from time to time under the
         Plan.  If Options are


                                      1
<PAGE>   2
         not designated as Incentive Stock Options or Non-Qualified Stock
         Options at the time of grant, the number of Options granted which
         qualify for treatment as Incentive Stock Options under the Code will
         be Incentive Stock Options, and the remainder of such Options, if any,
         will be Non-Qualified Stock Options.
                       
                 (8)   Participant shall mean an Eligible Employee who has
         been designated by the Committee to participate in the Plan.

                 (9)   Subsidiary shall mean any corporation to which the
         Company is a "parent corporation" as defined in Section 424(e) of the
         Code.

                 (10)  Incentive Stock Option shall mean a stock option granted
         under the Plan that is intended to be an incentive stock option within
         the meaning of Section 422 of the Code.

                 (11)  Non-Qualified Stock Option shall mean a stock option
         granted under the Plan that is not an incentive stock option within
         the meaning of Section 422 of the Code.

                                 III.  DURATION

         The Plan will be effective upon consummation of the initial public
offering of the Company's Common Stock (the "Effective Date"), subject to
approval of the Plan by the Company's shareholders within twelve months after
the Effective Date.  No Option shall be granted pursuant to the Plan more than
ten years after the Effective Date.

                              IV.  ADMINISTRATION

         The Plan will be administered as follows:

Committee

         The Plan shall be administered by the Committee as it may be
constituted by the Board from time to time.  The Committee shall consist solely
of two or more members of the Board who are outside directors within the
meaning of Section 162(m) of the Code.

Committee Powers

         The Committee shall be deemed to have and to be exercising all of the
powers of the Board in the performance of any of the powers and duties
delegated to it under the Plan, including, without limitation, the selection of
Participants, the determination of the number of shares for which each
Participant shall be granted an Option, and all other terms and conditions of
each Option to the extent not inconsistent with the Plan.  The Committee may
from time to time establish eligibility requirements for participation in the
Plan and rules for the administration of the Plan that are not inconsistent
with the provisions and purposes of the Plan.  The





                                       2
<PAGE>   3
Committee shall have the authority, exercisable in its sole discretion, to
grant various forms of Options containing such terms and conditions, consistent
with the provisions of this Plan, as the Committee shall determine.

Committee Action

         A majority of the members of the Committee shall constitute a quorum.
All action taken by the Committee at a meeting shall be by the vote of a
majority of those present at such meeting, but any action may be taken by the
Committee without a meeting upon written consent signed by all of the members
of the Committee.  Members of the Committee may participate in a meeting by
means of conference telephone or similar communications equipment by means of
which all persons participating in the meeting can hear each other.  The
Committee shall appoint a secretary and shall keep minutes of its meetings,
including those conducted by telephone conference.

Committee Determination Conclusive

         The determination of the Committee as to any disputed question arising
under the Plan, including questions of construction and interpretation, shall
be final, binding, and conclusive upon all persons.  Without limiting the
generality of the foregoing, the determination of the Committee as to whether a
Participant has terminated his employment and the date thereof, or the cause to
which termination of employment is attributable, shall be final, binding, and
conclusive upon all persons.

Committee Liability

         No member of the Committee or of the Board as a whole shall be liable
to any person for any action taken or omitted in connection with the
interpretation or administration of the Plan unless attributable to such
member's own willful misconduct or lack of good faith.

Expenses of Administration

         All expenses of administration of the Plan shall be borne by the
Company, and no part thereof shall be directly charged against the
Participants.

                         V.  SHARES SUBJECT TO THE PLAN

         Subject to adjustment as provided in Section VIII hereof, a total of
One Million One Hundred Thousand (1,100,000) shares of Common Stock of the
Company (the "Shares") shall be subject to the Plan.  The Shares shall consist
of unissued shares or previously issued shares reacquired and held by the
Company, and such number of shares shall be and is hereby reserved for sale for
such purpose.  Any of the Shares which remain unsold and which are not subject
to outstanding Options at the termination of the Plan shall cease to be
reserved for the purpose of the Plan, but until termination of the Plan, the
Company shall at all times reserve a sufficient number of Shares to meet the
requirements of the Plan.  Should any Option expire or be





                                       3
<PAGE>   4
cancelled prior to its exercise, the Shares theretofore subject to such Option
may again by subjected to an Option under the Plan.

                               VI.  PARTICIPATION

         Participation in the Plan will be subject to the following:

Eligibility

         Employees of the Company or a Subsidiary who are in a position to
materially contribute to the Company's or such Subsidiary's success shall be
eligible for participation under the Plan.  Eligible Employees shall include,
but shall not necessarily be limited to, officers and directors of the Company
or a Subsidiary.  Members of the Board of Directors or the board of directors
of a Subsidiary shall not be Eligible Employees solely by virtue of their being
directors of the Company or such Subsidiary, but directors otherwise qualified
shall be eligible to participate.

Participants

         The Committee shall determine and designate from time to time those
management, professional and key employees of the Company and its Subsidiaries,
including officers and directors active in capacities other than as directors
only, to whom Options are to be granted and who thereby become Participants in
the Plan.  A designation of an Eligible Employee to participate shall not
automatically entitle such Participant to participate with respect to future
Options.

                              VII.  PLAN OPERATION

         The Plan shall operate according to the following general guidelines:

Time of Granting Options

         Neither anything contained in the Plan or in any resolution adopted or
to be adopted by the Board of Directors or the stockholders of the Company nor
any action taken by the Committee shall constitute the granting of any Option.
The granting of an Option shall take place only when a written option agreement
shall have been duly executed and delivered by or on behalf of the Company and
the Participant to whom such Option has been granted.  No Option shall be
granted following the expiration of ten (10) years from the earlier of (i) the
Effective Date of this Plan as stated in Article III, or (ii) approval of this
Plan by the shareholders of the Company.

Option Price

         The purchase price of each Share placed under an Incentive Stock
Option shall be determined by the Committee, but shall in no event be less than
one hundred percent (100%) of the Fair Market Value of such Share on the date
the Incentive Stock Option is granted.  However,





                                       4
<PAGE>   5
the purchase price of each Share placed under an Incentive Stock Option to a
Participant who owns stock possessing more than ten percent (10%) of the total
combined voting power of all classes of stock of the Company or any Subsidiary
at the time of the grant shall be a least one hundred and ten percent (110%) of
the Fair Market Value of such Share on the date the Option is granted.  The
purchase price of each Share placed under a Non-Qualified Stock Option shall be
determined by the Committee, and may be less than, equal to, or greater than
the Fair Market Value of such Share on the date the Non-Qualified Stock Option
is granted.

Option Period and Terms

         No Option shall be exercisable after the expiration of ten (10) years
from the date such Option is granted.  However, if the Participant to whom an
Incentive Stock Option is granted owns stock possessing more than ten percent
(10%) of the total combined voting power of all classes of stock of the Company
or any Subsidiary at the time such Incentive Stock Option is granted, such
Incentive Stock Option shall not be exercisable after the expiration of five
(5) years from the date such Incentive Stock Option is granted.  Subject to the
provisions of the Plan, the Committee shall determine the terms and conditions
of each Option granted under the Plan, including the number of Shares covered
by the Option, and the time or times of exercise of the Option (which may be
for a term of up to ten (10) years from the date the Option is granted, or, in
the discretion of the Committee, may be for a shorter term designated by the
Committee).  The Committee may provide that an Option shall not be exercisable
for a designated period of time after grant.  The Committee may provide that
failure to exercise an Option as to the exercisable portion of the Option
during a specific time shall constitute a forfeiture of the right to exercise
such Option after termination of that time period.  So long as consistent with
the provisions of the Plan, the terms and conditions of any Option need not be
the same as the terms and conditions of any other Option.

Maximum Annual Amount Per Employee

         The aggregate fair market value (determined as of the time the
Incentive Stock Option is granted) of the stock with respect to which Incentive
Stock Options are exercisable for the first time by any Participant during any
calendar year (under this and any other plans of the Company or any Subsidiary)
shall not exceed $100,000.

Exercise of Options

         No Incentive Stock Option may be exercised unless the Participant
shall have been an employee of the Company or a Subsidiary at all times during
the period beginning on the date of grant of the Option and ending on the day
three (3) months before the date of such exercise. However, if a Participant
becomes disabled (within the meaning of Section 22(e)(3) of the Code) or dies,
no Incentive Stock Option may be exercised by such Participant after such
disability, or by the estate of such Participant or a person who acquired the
right to exercise such Option by bequest or inheritance or by reason of the
death of such Participant, unless the Participant shall have been an employee
of the Company or a Subsidiary at all times during the period beginning on the
date of grant of the Incentive Stock Option and ending on the date one (l) year
before the





                                       5
<PAGE>   6
date of such exercise.  Options may be exercised solely by the Participant
during his lifetime, or after his disability by his legal representative on his
behalf, or after his death by the personal representative of the Participant's
estate or the person or persons entitled thereto under his will or under the
laws of descent and distribution.

         The purchase price of the Shares as to which an Option is exercised
shall be paid in full in cash and/or other property, including stock of the
Company, as deemed acceptable by the Committee, at the time of the exercise.
Without limiting the generality of the foregoing, the Committee shall have the
power to establish procedures from time to time for Participants:  (1) to pay
the exercise price of an Option by withholding from the total number of Shares
to be acquired upon exercise of an Option that number of Shares having a Fair
Market Value equal to the aggregate exercise price; (2) to have withheld from
the total number of Shares to be acquired, in the same manner as (1) above, the
withholding obligation for federal and state income and other taxes; and (3) to
exercise a portion of the Option by delivering already-owned shares of Common
Stock of the Company in payment of the exercise price.  A Participant shall not
be or have any of the rights or privileges of a shareholder of the Company in
respect of any Shares purchasable upon the exercise of any part of an Option
unless and until certificates representing such Shares shall have been issued
by the Company to such Participant.

Use of Proceeds

         The proceeds received by the Company from the sale of stock pursuant
to this Plan will be used for general corporate purposes.

                     VIII.  CAPITAL CHANGES OF THE COMPANY

         In the event there is any change in the Common Stock of the Company
through the declaration of stock dividends, or through recapitalization
resulting in stock splits, or combinations or exchanges of shares, or any
similar transactions, the number of Shares subject to Options previously
granted and the number of Shares remaining available for Options and the price
per Share of such Shares shall be appropriately adjusted by the Committee.

         In the event the Company shall be a party to any merger, consolidation
or corporate reorganization, as the result of which the Company shall be the
surviving corporation, the rights and duties of the Participants and the
Company shall not be affected in any manner.  In the event the Company shall
sell all or substantially all of its assets or shall be a party to any merger,
consolidation or corporate reorganization, as the result of which the Company
shall not be the surviving organization, or in the event any other corporation
may make a tender or exchange offer for stock of the Company (the surviving
corporation, purchaser, or tendering corporation being hereinafter collectively
referred to as the "purchaser," and the transaction being hereinafter referred
to as the "purchase"), then the Board of Directors may, at its election, (i)
reach an agreement with the purchaser that the purchaser will assume the
obligations of the Company as to all outstanding Options; (ii) reach an
agreement with the purchaser that the purchaser will convert each outstanding
Option into an option of at least equal value as to stock of the purchaser; or
(iii) not later than thirty (30) days prior to the effective date of the
purchase, notify





                                       6
<PAGE>   7
all Participants that their Options are accelerated and afford to each
Participant a right for ten (10) days after the date of such notice to exercise
any then unexercised portion of all Options held by him whether or not such
Options shall then be exercisable under the terms of the Plan or his option
agreement; and within such ten day period, each such Participant may exercise
any portion of any Option as he may desire.

                           IX.  LIMITATION OF RIGHTS

         Participation in this Plan is subject to certain limitations:

Limitations

         Nothing in this Plan shall be construed to:

                 (1)      give any employee of the Company or a Subsidiary any
         right to be designated a Participant herein, other than in the sole
         discretion of the Committee;

                 (2)      give a Participant any rights whatsoever with respect
         to Shares until Options are exercised and Shares are issued to the
         Participant;

                 (3)      give a Participant or any person any interest in any
         fund or in any specific asset or assets of the Company;

                 (4)      limit in any way the right of the Company or a
         Subsidiary to terminate a Participant's employment with the Company or
         a Subsidiary at any time; or

                 (5)      be evidence of any agreement or understanding,
         express or implied, that the Company or a Subsidiary will employ a
         Participant in any particular position or at any particular rate of
         remuneration.

Nonassignability of Options

         Options shall not be transferable other than by will or by the laws of
descent and distribution, and during a Participant's lifetime shall be
exercisable only by him (unless he becomes disabled, in which event they may be
exercised by his legal representative).

Power of the Company

         The existence of outstanding Options shall not affect in any way the
right or power of the Company or its subsidiaries or their stockholders to make
or authorize any or all adjustments, recapitalization, reorganization or other
changes in the capital structure of the Company or its Subsidiaries or their
businesses, or any merger or consolidation of the Company or its Subsidiaries
or any issue of bonds, debentures, preferred stock or the right to acquire any
thereof, or the dissolution or liquidation of the Company or its Subsidiaries,
or any sale or transfer of all





                                       7
<PAGE>   8
or any part of their assets or business, or any other corporate act or
proceeding whether of a similar character or otherwise.

                   X.  TERMINATION AND AMENDMENT OF THE PLAN

         The Plan shall terminate upon the expiration of ten years after the
Effective Date and no Options shall be granted after that date.  The Board of
Directors may amend, alter, or discontinue the Plan, but no amendment or
alteration shall be made which would impair the rights of any Participant under
any Option theretofore granted, without his consent, unless his Option
Agreement so provides.  The Board of Directors may at any time and from time to
time modify or amend the Plan in such respects as it shall deem advisable in
order that the Options intended to be Incentive Stock Options satisfy the
applicable provisions of the Code.

                          XI.  GOVERNMENT REGULATIONS

         The Plan, and the granting and exercise of Options thereunder, and the
obligation of the Company to sell and deliver Shares under such Options, shall
be subject to all applicable laws, rules and regulations, and to such approvals
by any governmental agencies or national securities exchanges as may be
required.

Purchase for Investment

         Whether or not the Options and Shares covered by the Plan have been
registered under the Securities Act of 1933, as amended, each Participant
exercising an Option may be required by the Company to give a representation in
writing that he is acquiring such Shares for his own account for investment and
not with a view to, or for sale in connection with, the distribution of any
part thereof.

Governing Law

         The place of administration of the Plan shall be conclusively deemed
to be within the State of Texas; and the validity, construction, interpretation
and effect of the Plan and all rights of any of the persons having or claiming
to have any interest in the Plan shall be governed by the laws of the State of
Texas.





                                       8

<PAGE>   1
                                                                 EXHIBIT 10.32.1

                                    FORM OF
                                PROMISSORY NOTE



U.S.$400,000.00                                               ____________, 1997


         FOR VALUE RECEIVED, after date, without grace, in the manner, on the
dates and in the amounts so herein stipulated, the undersigned, JAY N.
SILVERMAN ("Borrower"), PROMISES TO PAY TO THE ORDER OF EAGLE GEOPHYSICAL,
INC., a Delaware corporation ("Lender"), 50 Briar Hollow Lane, 6th Floor West,
Houston, Harris County, Texas 77027, the sum of FOUR HUNDRED THOUSAND DOLLARS
AND NO/100'S ($400,000.00) in lawful money of the United States of America,
which shall be legal tender in payment of all debts and dues, public and
private, at the time of payment, and to pay interest on the unpaid principal
amount until maturity at a fixed rate of six percent (6%) per annum.

         This Note is payable as follows:

                 Payments of accrued interest shall be payable monthly on the
         last day of each month beginning on _____________, 1997 through and
         including _______________, 2000;

                 Equal monthly payments of interest and principal, based on a
         60 month amortization, shall be payable monthly on the last day of
         each month beginning on __________, 2000 through and including
         __________, 2005; and

                 On _____________, 2005, the entire balance of principal and
accrued interest shall be due and payable.

         It is agreed that time is of the essence of this Note.  In the event
of default in the payment of any installment of principal or interest when due
or in the event of any other default hereunder, Lender may accelerate and
declare this Note immediately due and payable without notice and opportunity to
cure.  Any failure to exercise this option shall not constitute a waiver by
Lender of the right to exercise the same at any other time.

         In the event of default in the making of any payment herein provided,
either of principal or interest, or in the event this Note is declared due,
interest shall accrue at the maximum non-usurious interest rate permitted by
applicable law from time to time in effect as such law may be interpreted,
amended, revised, supplemented or enacted (the "Maximum Rate").

         Borrower hereby agrees to pay all expenses incurred, including
reasonable attorneys' fees, all of which shall become a part of the principal
hereof, if this Note is placed in the hands of an



_________
Initials
<PAGE>   2
attorney for collection or if collected by suit or through any probate,
bankruptcy or any other legal proceedings.

         Interest charges will be calculated on amounts advanced hereunder on
the actual number of days these amounts are outstanding on the basis of a
365-day or 366-day year, as is applicable.  It is the intention of the parties
hereto to comply with all applicable usury laws; accordingly, it is agreed that
notwithstanding any provision to the contrary in this Note, or in any of the
documents securing payment hereof or otherwise relating hereto, no such
provision shall require the payment or permit the collection of interest in
excess of the Maximum Rate.  If any excess of interest in such respect is
provided for, or shall be adjudicated to be so provided for, in this Note or in
any of the documents securing payment hereof or otherwise relating hereto, then
in such event (1) the provisions of this paragraph shall govern and control,
(2) neither Borrower, endorsers or guarantors, nor their heirs, legal
representatives, successors or assigns nor any other party liable for the
payment hereof, shall be obligated to pay the amount of such interest to the
extent that it is in excess of the Maximum Rate, (3) any such excess which may
have been collected shall be either applied as a credit against the then unpaid
principal amount hereof or refunded to Borrower, and (4) the provisions of this
Note and any documents securing payment of this Note shall be automatically
reformed so that the effective rate of interest shall be reduced to the Maximum
Rate.  For the purpose of determining the Maximum Rate, all interest payments
with respect to this Note shall be amortized, prorated and spread throughout
the full term of the Note so that the effective rate of interest on account of
this Note is uniform throughout the term hereof.

         Borrower agrees that the Maximum Rate to be charged or collected
pursuant to this Note shall be the applicable indicated rate ceiling as defined
in TEX. REV. CIV. STAT. ANN. Art. 5069-1.04, provided that Lender may rely on
other applicable laws, including without limitation laws of the United States,
for calculation of the Maximum Rate if the application thereof results in a
greater Maximum Rate.  Except as provided above, the provisions of this Note
shall be governed by the laws of the State of Texas.

         Each maker, surety, guarantor and endorser waives demand, grace,
notice, presentment for payment, notice of intention to accelerate the maturity
hereof, notice of acceleration of the maturity hereof and protest, and agrees
that this Note may be renewed, and the time of payment extended from time to
time, without notice and without releasing any of the foregoing.

         Borrower may prepay this Note, in whole or in part, at any time prior
to maturity without penalty, and interest shall cease on any amount prepaid.
Any partial prepayment shall be applied toward the payment of the principal
installments last maturing on the Note, that is, in the inverse order of
maturity, without reducing the amount or time of payment of the remaining
installments.

         Borrower agrees that all disputes in any way relating to, arising
under, connected with, or incident to this Note, and over which the United
States federal courts have subject matter jurisdiction, shall be litigated, if
at all, exclusively in the United States District Court for the Southern
District  of Texas, Houston Division, and, if necessary, the corresponding
appellate courts.  Borrower further agrees that all disputes in any way
relating to, arising under, connected





________
Initials
                                     -2-
<PAGE>   3
with, or incident to this Agreement, and over which the United States federal
courts do not have subject matter jurisdiction, shall be litigated, if at all,
exclusively in the Courts of the State of Texas, in Harris County, and, if
necessary, the corresponding appellate courts.  Borrower hereby submits itself
to the personal jurisdiction of, and consents to venue in, any such court, and
hereby waives any claim it may otherwise have that such court lacks personal
jurisdiction over it, or that such court is an inconvenient forum, with respect
to any matter or proceeding arising out of this Note.  Borrower further agrees
to voluntarily appear and to enter a general appearance in any proceeding
arising out of this Note which is brought in any such court.  Borrower agrees
that service of process in any matter or proceeding relating hereto may be
effected upon it by certified or registered mail to the address specified in
the first paragraph of this Note or such other address as Borrower may
designate in writing to Lender from time to time.

         The proceeds from this Note will be used by Borrower to purchase
25,000 shares of common stock of Lender, $.01 par value (the "Stock"), pursuant
to that certain Subscription Agreement dated as of _______, 1997, by and
between Borrower and Lender, and this Note is secured by a pledge of the Stock
pursuant to that certain Security Agreement- Pledge of even date herewith.





                                        ----------------------------------------
                                        Jay N. Silverman





                                     -3-

<PAGE>   1
                                                                 EXHIBIT 10.32.2

                                    FORM OF
                             SUBSCRIPTION AGREEMENT


         This Subscription Agreement (this "Agreement") is made and entered
into as of this _____ day of _________, 1997, by and between EAGLE GEOPHYSICAL,
INC., a Delaware corporation ("Eagle"), and JAY N. SILVERMAN ("Silverman"), and
relates to the subscription by Silverman for 25,000 shares of common stock of
Eagle.


         NOW, THEREFORE, in consideration of the mutual promises contained
herein, and other good and valuable consideration, the receipt and sufficiency
of which are hereby acknowledged, the parties agree as follows:

         1.      ISSUANCE OF STOCK AND PAYMENT.

                 (a)      Subscription.  Eagle agrees to sell to Silverman, and
         Silverman agrees to purchase from Eagle, 25,000 shares (the "Shares")
         of common stock of Eagle (the "Stock"), at a per share price of $16,
         for an aggregate purchase price of $400,000 (the "Purchase Price"),
         subject to the provisions of Section 1(c) hereof.

                 (b)      Payment of Purchase Price.  Silverman shall deliver
         the Purchase Price by executing a promissory note in the original
         principal amount of $400,000 (the "Note") payable to Eagle
         concurrently with the execution and delivery hereof.

                 (c)      Purchase Price Adjustment.  In the event the initial
         public offering price of the Stock in connection with the Registration
         Statement on Form S-1 (Registration No. 333-28303) filed with the
         Securities and Exchange Commission by Eagle is determined to be less
         than $16.00 per share of Stock, the Purchase Price shall be adjusted
         downward accordingly, and the principal amount of the Note shall be
         credited in an amount equal to the difference between the Purchase
         Price as defined in Section 1(a) hereof and the adjusted Purchase
         Price, which shall be based upon the actual initial public offering
         price per share.

         2.      DELIVERY OF SHARE CERTIFICATE.  Promptly upon receipt of the
Purchase Price, Eagle shall issue a share certificate or certificates
representing the Shares to Silverman and shall promptly deliver such
certificate or certificates to Silverman.

         3.      REPRESENTATIONS AND WARRANTIES OF EAGLE.  In order to induce
Silverman to purchase the Shares and to otherwise consummate the transactions
contemplated by this Agreement, Eagle represents and warrants as follows:

                 (a)      Status of Eagle.  Eagle is a corporation duly
         organized, validly existing and in good standing under the laws of the
         State of Delaware, and has full corporate
<PAGE>   2
         power to carry on its business as the same is now conducted and to own
         or lease its assets as the same are now being owned or leased.

                 (b)      Silverman's Title upon Consummation.  Upon
         consummation of the transactions contemplated by this Agreement in
         accordance with the terms hereof, Silverman shall be vested with good
         and marketable title to the Shares, free and clear of any liens,
         claims, charges or other encumbrances or restrictions whatsoever,
         except as set forth in Eagle's Certificate of Incorporation, as
         amended, or Eagle's Amended and Restated Bylaws or otherwise arising
         by operation of law.  The Shares, when issued and delivered pursuant
         to this Agreement, will be validly issued, fully paid and
         nonassessable.

                 (c)      Authority for Agreement.  Eagle has the full right,
         power and authority to enter into this Agreement and to perform its
         obligations hereunder.  This Agreement has been duly and validly
         executed and delivered by Eagle and constitutes a valid and binding
         obligation of Eagle, enforceable against Eagle in accordance with its
         terms, subject to the effect of bankruptcy, insolvency,
         reorganization, arrangement, moratorium or other similar laws relating
         to or affecting the rights of creditors generally or upon general
         principles of equity and the availability of injunctive relief or
         other equitable remedies, whether enforcement is considered at law or
         in equity (hereinafter the "Bankruptcy and Equitable Exceptions").

                 (d)      Litigation, Etc.  There is no action, proceeding or
         investigation pending or (to the knowledge of Eagle) threatened (or
         any reasonable basis therefor known to Eagle) which (i) questions the
         validity of this Agreement or any of the transactions contemplated
         hereby or (ii) if adversely determined, could reasonably be expected
         to result, either in any case or in the aggregate, in a material
         adverse effect on the business of Eagle.  Eagle has no material
         contingent or undisclosed liabilities as of the date hereof.

         4.      REPRESENTATIONS AND WARRANTIES OF SILVERMAN.  In order to
induce Eagle to issue and sell the Shares to Silverman and to otherwise
consummate the transactions contemplated by this Agreement, Silverman
represents and warrants as follows:

                 (a)      Acquisition for Own Account.  Silverman is acquiring
         the Shares for his own account, for investment and not with a view to
         the sale or distribution thereof or with any present intention of
         distributing or selling the same, or dividing the Shares with other
         persons.

                 (b)      Securities Law Restrictions.  Silverman will not
         sell, assign, transfer, pledge or otherwise dispose of any of the
         Shares except in accordance with the provisions of applicable state
         and federal securities laws.




                                      2
<PAGE>   3
                 (c)      No Public Solicitation.  Eagle has not offered the
         Shares to Silverman by means of advertising or other form of public
         solicitation.

                 (d)      Investment Risk.  Silverman has such knowledge and
         experience in financial business matters as to be capable of
         evaluating the merits and risks of investment in the Shares.
         Silverman acknowledges that Eagle is a combination of Seitel
         Geophysical, Inc. and Energy Research International and its operating
         subsidiaries with no operating history and that his investment in the
         Shares is highly speculative and involves a high degree of risk;
         Silverman further acknowledges that he is capable of sustaining a loss
         of the Purchase Price paid for the Shares.  This representation does
         not constitute a waiver by Silverman of any liability on the part of
         Eagle for its breach of any representations, warranties, conditions or
         covenants contained herein.

                 (e)      Information Provided.  Silverman has had the
         opportunity to ask questions of, and receive satisfactory answers
         from, the executive management of Eagle regarding Eagle and the
         Shares, including the terms and conditions of this Agreement and the
         proposed business plan of Eagle and related matters.  Silverman has
         had the opportunity to obtain the information necessary to satisfy
         himself concerning the answers so obtained.  Nothing contained herein
         shall be interpreted to relieve the responsibility of Eagle to provide
         adequate and accurate disclosure in the representations and warranties
         contained in this Agreement.

                 (f)      Accredited Investor.  Silverman is an "accredited
         investor" as said term is defined in Rule 501 of Regulation D under
         the Securities Act of 1933, as amended (the "Securities Act"), in that
         he is an executive officer of Eagle.

                 (g)      Legend, Etc.  Silverman acknowledges and agrees that
         (i) the certificates representing the Shares will contain the legend
         referred to in Section 5 hereof, (ii) the Shares are not registered
         under the Securities Act or any other federal or state law, (iii)
         Silverman will have no right to require such registration and must
         bear the economic risks of their investment for an indefinite period
         of time and are capable of bearing such risk, and (iv) the Shares are
         a nonliquid investment and there is not now and there may never be any
         public market for the Shares and Silverman cannot now and may never be
         able to avail himself of the benefits of Rule 144 adopted by the
         Securities and Exchange Commission with respect to the resale of the
         Shares.

                 (h)      Authority for Agreement.  Silverman has the full
         right, power and authority to enter into this Agreement and to perform
         his obligations hereunder.  This Agreement has been duly and validly
         executed and delivered by Silverman and constitutes a valid and
         binding obligation of Silverman, enforceable against Silverman in
         accordance with its terms, subject to the Bankruptcy and Equitable
         Exceptions.

                 (i)      No Other Representations.  Eagle and its directors,
         officers and employees have made no representations, promises or
         projections regarding the future financial





                                      3
<PAGE>   4
         status or competitive success of Eagle or its operations.  Silverman
         understands that except as set forth herein, Eagle makes no
         representations or warranties whatsoever, and disclaims all liability
         and responsibility for any representation, warranty, statement or
         information made or communicated (orally or in writing) to Silverman
         other than as specifically set forth herein.

         5.      STOCK LEGEND.  Each stock certificate evidencing the Shares,
including any such stock certificates representing Shares issued to subsequent
transferees as permitted hereunder, shall be stamped or otherwise imprinted
with a legend in substantially the following form:

         "THE SHARES REPRESENTED BY THIS CERTIFICATE MAY NOT BE TRANSFERRED
         EXCEPT BY OPERATION OF LAW UNLESS (1) A REGISTRATION STATEMENT WITH
         RESPECT TO SUCH SHARES SHALL BE EFFECTIVE UNDER THE SECURITIES ACT OF
         1933, AS AMENDED, OR (2) THE CORPORATION SHALL HAVE RECEIVED AN
         OPINION OF COUNSEL SATISFACTORY TO IT THAT NO VIOLATION OF SUCH ACT
         WILL BE INVOLVED IN SUCH TRANSFER, OR (3) THE CORPORATION SHALL HAVE
         RECEIVED A "NO ACTION" LETTER FROM THE SECURITIES AND EXCHANGE
         COMMISSION COVERING SUCH TRANSFER."

         6.      MISCELLANEOUS.

                 (a)      Notices.  All notices, requests and other
         communications hereunder shall be deemed to have been duly given if in
         writing and either delivered personally, sent by facsimile
         transmission or by air courier service, or mailed by postage prepaid
         registered or certified U.S. mail, return receipt requested, to the
         addresses designated below or such other addresses as may be
         designated in writing by notice given hereunder, and shall be
         effective upon personal delivery or facsimile transmission thereof or
         72 hours following deposit in the U.S. mail or 24 hours following
         deposit with an air courier service:



IF TO EAGLE:              Eagle Geophysical, Inc.
                          50 Briar Hollow Lane, 6th Floor West
                          Houston, Texas 77027
                          Attn:  Richard W. McNairy
                          Telephone: (713) 627-1990
                          Facsimile: (713) 627-1027





                                              4
<PAGE>   5
IF TO SILVERMAN:          Jay N. Silverman
                          Eagle Geophysical, Inc.
                          50 Briar Hollow Lane, 6th Floor West
                          Houston, Texas 77027
                          Telephone: (713) 627-1990
                          Facsimile: (713) 627-1020


                 (b)      Governing Law.  This Agreement shall be construed and
         governed in accordance with the laws of the State of Texas, without
         giving effect to any conflict of law rules or provisions.

                 (c)      Counterparts.  This Agreement may be executed in one
         or more counterparts, each of which shall be deemed an original, but
         all of which together shall constitute one and the same Agreement.

                 (d)      Entire Agreement.  Except as otherwise specifically
         provided herein, this Agreement constitutes the entire agreement
         between the parties hereto with respect to the subject matter hereof.
         No modification, amendment or waiver of any provision hereof shall be
         binding upon any party hereto unless it is in writing and executed by
         all of the parties hereto or, in the case of a waiver, by the party
         waiving compliance.

                 (e)      Waiver.  The waiver by any party hereto of any
         breach, default, misrepresentation or breach of warranty or covenant
         hereunder, whether intentional or not, shall not be deemed to extend
         to any prior or subsequent breach, default, misrepresentation or
         breach of warranty or covenant hereunder and shall not affect in any
         way any rights arising by virtue of any such prior or subsequent
         occurrence.

                 (f)      Severability.  In the event any one or more of the
         provisions contained in this Agreement or any application thereof
         shall be finally determined by a court of competent jurisdiction to be
         invalid, illegal or unenforceable in any respect, any other
         application thereof and the validity, legality, or enforceability of
         the remaining provisions of this Agreement shall not in any way be
         affected or impaired thereby.

                 (g)      Rule 405 Employee Benefit Plan.  This Agreement is
         intended to be an Employee Benefit Plan within the meaning of Rule 405
         under the Securities Act.

                 (h)      Expenses.  Each party hereto shall pay all costs and
         expenses incurred or to be incurred by it in negotiating and preparing
         this Agreement and in closing and effectuating the transactions
         contemplated hereby.

                 (i)      Section Headings.  The section headings contained
         herein are for reference purposes only and shall not in any way affect
         the meaning or interpretation of this Agreement.





                                      5
<PAGE>   6
                 (j)      Successors and Assigns.  This Agreement shall be
         binding upon and inure to the benefit of the legal representatives,
         successors and permissible assigns of the parties hereto, whether so
         expressed or not, except as specifically otherwise provided.

         IN WITNESS WHEREOF, the parties hereto have executed and delivered
this Agreement as of the date first above written, with the intention of being
legally bound hereby.



                             



                                        EAGLE GEOPHYSICAL, INC.
                             
                             
                                        BY:                         
                                            ------------------------------------
                                            RICHARD W. MCNAIRY,
                                            VICE PRESIDENT-
                                            CHIEF FINANCIAL OFFICER
                             
                             
                             
                             
                                            
                                        ----------------------------------------
                                        JAY N. SILVERMAN





                                      6

<PAGE>   1
                                                                         10.32.3





                          SECURITY AGREEMENT - PLEDGE


                                 BY AND BETWEEN




                                JAY N. SILVERMAN
                                   ("Debtor")




                                      AND




                            EAGLE GEOPHYSICAL, INC.
                               ("Secured Party")





              DATED EFFECTIVE THE _____ DAY OF ____________, 1997
<PAGE>   2
                          SECURITY AGREEMENT - PLEDGE


       Jay N. Silverman (the "Debtor"), and Eagle Geophysical, Inc., a Delaware
corporation (the "Secured Party"), agree as follows:

                           Section 1.  General Terms

       1.1    Secured Obligations.  Debtor hereby grants to Secured Party a
security interest in the property described in Section 1.2 of this Agreement
(the "Collateral") to secure the performance and payment of all obligations and
indebtedness of Debtor to Secured Party arising under or in connection with (i)
that certain Promissory Note in the original principal amount of $400,000
executed by Debtor in favor of Secured Party of even date herewith (the "Note")
and, (ii) this Agreement (all of the foregoing described in this Section 1
being the "Secured Indebtedness").

       1.2    The Collateral.  The Collateral of this Agreement is 25,000
shares of Common Stock of Secured Party issued in the name of Debtor currently
in the possession of, and to be delivered in the future to, Secured Party
("Pledged Stock").   "Collateral" as used in this Agreement includes the
Pledged Stock and, without limitation, any stock rights, rights to subscribe,
liquidating dividends, stock dividends, property, cash distributions, dividends
paid in stock, new securities, cash dividends or other property which Debtor
may hereafter become entitled to receive on account of the Collateral.  In the
event Debtor receives any such property, Debtor will immediately deliver same
to Secured Party to be held by Secured Party in the same manner as the property
originally deposited as Collateral.  The Collateral of this Agreement also
includes the proceeds of any and all property described above including goods
and intangible personal property.

                   Section 2.  Representations and Warranties

       Debtor represents, warrants and agrees that:

       2.1    Validity, Enforceability.  This Agreement has been duly executed
and delivered by Debtor and constitutes a legal, valid and binding obligation
of Debtor, enforceable against Debtor in accordance with its terms, except as
the same may be limited by bankruptcy, insolvency or other similar laws
affecting creditors' rights generally and by general equity principles.

       2.2    Ownership of Collateral.  Debtor is the legal and equitable owner
of the Collateral free and clear of all other liens, security interests,
charges and encumbrances of every kind and nature.  The Collateral is duly
authorized, validly issued, fully paid and non-assessable; Debtor has legal
title to the Collateral and good right and lawful authority to pledge, assign
and deliver the Collateral in the manner hereby done or contemplated; and no
consent or approval of any governmental body or regulatory authority, or any
securities exchange, is or will be necessary for the rights created under this
Agreement to be valid as to the Collateral.

       2.3    Defending the Collateral.  Debtor will defend the Collateral and
its proceeds against the claims and demands of all third persons.

       2.4    Secured Party's Duty.  Secured Party's duty with reference to the
Collateral shall be solely to use reasonable care in the custody and
preservation of Collateral in Secured Party's possession.
<PAGE>   3
       2.5    Waiver.  Demand, notice, protest and all demands and notices of
any action taken by Secured Party under this Agreement or in connection with
any indebtedness of Debtor to Secured Party, are hereby waived, and any
indulgence of Secured Party, substitution for, exchange of or release of
Collateral, in whole or in part, or addition or release of any person liable on
the Collateral is hereby assented and consented to by Debtor.

       2.6    Non-liability of Secured Party.  Secured Party shall not be
responsible in any way for any depreciation in the value of the Collateral, nor
shall any duty or responsibility whatsoever rest upon Secured Party to take
necessary steps to preserve rights against prior parties or to enforce
collection of the Collateral by legal proceedings or otherwise, the sole duty
of Secured Party being to receive collections, remittances and payments on such
Collateral as and when made and received by Secured Party, and at Secured
Party's option, applying the amount or amounts so received, after deduction of
any collection costs incurred, as payment upon the Secured Indebtedness, or
holding same for the account and order of Debtor.

       2.7    Payment of Charges by Debtor.  Debtor shall pay prior to
delinquency all taxes, charges, liens and assessments against the Collateral.
Upon Debtor's failure to pay, Secured Party at its option may pay any tax,
charge, lien or assessment and shall be the sole judge of the legality or
validity thereof and the amount necessary to discharge the same.  Such payment
shall become part of the Secured Indebtedness and shall be paid to Secured
Party by Debtor immediately and without demand, with interest thereon from the
date of payment by Secured Party at the maximum non-usurious rate of interest
permitted by applicable law with respect to Debtor.

                         Section 3.  Events of Default

       Debtor shall be in default under this Agreement upon the happening of
any of the following events or conditions (herein called an "Event of
Default"):

       (1)    Debtor's failure to pay when due any of the Secured Indebtedness.

       (2)    Default by Debtor in the punctual performance of any of the
obligations, covenants, terms or provisions contained or referred to in this
Agreement or in any instrument evidencing the Secured Indebtedness, including
without limitation, the Note.

       (3)    Sale or encumbrance of any of the Collateral, or the making of
any levy, seizure or attachment thereof or thereon.

       (4)    Debtor's insolvency; the appointment of a receiver for all or any
part of the property of Debtor; an assignment for the benefit of creditors of
Debtor; the calling of a meeting of creditors of Debtor; or the commencement of
any proceeding under any bankruptcy or insolvency laws by or against Debtor or
any guarantor or surety for Debtor.




                                     -3-
<PAGE>   4
                    Section 4.  Rights Exclusive of Default

       4.1    Assignment by Secured Party Permitted.  This Agreement, Secured
Party's rights hereunder or the indebtedness hereby secured may be assigned
from time to time, and in any such case the Assignee shall be entitled to all
of the rights, privileges and remedies granted in this Agreement to Secured
Party.  Debtor may not assign any of its rights or obligations hereunder
without the prior written consent of Secured Party.

       4.2    Agents; Delivering to Secured Party.  Secured Party shall have
the right to appoint one or more agents for the purpose of retaining physical
possession of the certificates or instruments representing or evidencing the
Collateral.  For the better perfection of the Secured Party's rights in and to
the Collateral and to facilitate implementation of such rights, Debtor shall,
insofar as possible, cause all the certificates, documents and other
instruments evidencing, representing or otherwise comprising the Collateral, to
be delivered directly to the Secured Party, as the Secured Party shall from
time to time direct, immediately upon any of the same becoming part of the
Collateral.  Secured Party is hereby authorized to execute, on behalf of the
Debtor, all documents reasonably necessary to effect the delivery of the
Collateral directly to Secured Party.  Secured Party shall have the right at
any time and from time to time (whether before or after an Event of Default) to
retain as Collateral all payments, dividends and distributions regarding the
Collateral otherwise payable or distributable to Debtor.

       4.3    Exercise of Voting and/or Consensual Rights; Cash Dividends.  (a)
(i)  The Debtor shall be entitled to exercise any and all voting and/or
consensual rights and powers relating or pertaining to the Collateral or any
part thereof for any purpose not inconsistent with the terms of this Agreement,
until (x) occurrence of an Event of Default or an event which, with the giving
of notice or lapse of time, or both, would become an Event of Default shall
have occurred and be continuing, and (y) written notification to Debtor by the
Secured Party that Secured Party intends to exercise the rights granted to
Debtor under this Section 4.3(a)(i).

                            (ii)  Until an Event of Default or an event which,
with the giving of notice or lapse of time, or both, would become an Event of
Default shall have occurred and be continuing and written notification to
Debtor by the Secured Party that Secured Party intends to exercise the rights
granted to Debtor under this Section 4.3(a)(ii), the Debtor shall be entitled
to receive and retain any and all cash dividends or other cash payments paid on
the Collateral.  However, any and all stock and/or liquidating dividends,
distributions in property, or cash returns of capital or other distributions
made on or in respect of the Collateral, whether resulting from a subdivision,
combination or reclassification of the capital stock or received in exchange
for Collateral or any part thereof or as a result of any merger,
reorganization, consolidation, acquisition or other exchange of assets, and any
and all cash and other property received in





                                      -4-
<PAGE>   5
redemption of or in exchange for any Collateral (either at maturity, upon call
for redemption or otherwise), shall be and become a part of the Collateral and,
if received by the Debtor, shall be held in trust for the benefit of the
Secured Party and shall forthwith be delivered to the Secured Party or its
designated agent to be held subject to the terms of this Agreement.  Debtor
agrees to execute any additional documents, including the proper instruments of
assignment or stock power, with respect to Collateral delivered to Secured
Party.

                     (b)    (i)   Upon the occurrence and during the continuance
of an Event of Default or an event which, with the giving of notice or the
lapse of time, or both, would become an Event of Default, and upon the giving
of the notice referred to in Section 4.3(a)(i), all rights of the Debtor to
exercise the voting and/or consensual rights and powers which it is entitled to
exercise pursuant to Section 4.3(a)(i) prior to such notice shall cease.

                            (ii)  Upon the giving of the notice referred to in
Section 4.3(a)(ii), all rights of the Debtor to receive cash dividends or other
payments which it is authorized to receive and retain pursuant to Section
4.3(a)(ii) prior to such notice shall cease.

                            (iii) Upon the occurrence of an Event of Default
and the giving of notice referred to in Section 4.3(a)(i) or upon the giving of
notice referred to in Section 4.3(a)(ii), all such rights referred to in
Sections 4.3(a)(i) and 4.3(a)(ii), as the case may be, shall thereupon become
vested in the Secured Party, who shall have the sole and exclusive right and
authority to exercise such voting and/or consensual rights and powers and/or to
receive and retain the dividends.  Any and all money and other property paid
over to or received by the Secured Party pursuant to the provisions of this
subsection (b) shall be retained by the Secured Party as part of the Collateral
and be applied in accordance with the provisions hereof.

              (c)    For the foregoing purposes in this Section 4.3 Debtor
hereby names, constitutes and appoints Secured Party as Debtor's proxy in the
Debtor's name, place and stead to vote any and all of the securities, as such
proxy may elect, for and in the name, place and stead of Debtor, as to all
matters coming before shareholders, such proxy to be irrevocable and being
coupled with an interest.  The rights, powers and authority of said proxy shall
remain in full force and effect, and shall not be rescinded, revoked,
terminated, amended or otherwise modified until all the Secured Indebtedness
has been fully satisfied.

                   Section 5.  Rights in the Event of Default

       Upon the occurrence of an Event of Default and at any time thereafter,
and in addition to the rights granted pursuant to Section 4:





                                      -5-
<PAGE>   6
       (a)    Secured Party may declare all obligations secured hereby
immediately due and payable.

       (b)    Secured Party shall have the rights and remedies provided in the
Texas Business and Commerce Code in force at the date of execution of this
Agreement and under other applicable laws of each state having jurisdiction
over the Collateral or any part thereof.

       (c)    In addition to the rights and remedies referred to above, Secured
Party may, in its discretion, sell, assign and deliver all or any part of the
Collateral at any broker's board or at public or private sale without notice or
advertisement, and bid and become purchaser at any public sale or at any
Broker's Board.

       (d)    Secured Party shall have the right to transfer legal and
beneficial title to such number of shares of the Pledged Stock to Secured Party
as may be necessary to satisfy the damages arising from such default.  The
value of a share of Pledged Stock for the purposes of this paragraph (d) only
shall be equal to the average closing price for the Secured Party's Common
Stock on the preceding five business days as reported on the Nasdaq National
Market System.

       (e)    If notice to Debtor is required by the Texas Business and
Commerce Code or other applicable law of public or private sale of Collateral,
Secured Party may fulfill said notice requirement by giving written notice to
Debtor ten (10) days prior to the date of public sale of the Collateral or
prior to the date after which private sale of the Collateral will be made, by
mailing such notice to Debtor at the address designated in this Agreement.
Secured Party shall apply the proceeds of any disposition of Collateral
available for satisfaction of Secured Indebtedness first to costs of sale or
collection, then to the amount owed to Secured Party, with any balance to be
held as Collateral until termination of this Agreement.

       (f)    Secured Party may at any time demand, sue for, collect or make
any compromise or settlement with reference to the Collateral as Secured Party,
in its sole discretion, chooses.  Secured Party may delay exercising or omit to
exercise any right or remedy under this Agreement without waiving that or any
other past, present or future right or remedy, except in writing signed by
Secured Party.

       (g)    Secured Party may remedy any default and may waive any default
without waiving the default remedied or without waiving any other prior or
subsequent default.

       (h)    The remedies of Secured Party hereunder are cumulative, and the
exercise of any one or more of the remedies provided for herein shall not be
construed as a waiver of any of the other remedies of Secured Party.

       (i)    SECURED PARTY MAY ENFORCE ITS RIGHTS UNDER THIS AGREEMENT WITHOUT
RESORT TO PRIOR JUDICIAL PROCESS OR JUDICIAL HEARING, AND DEBTOR EXPRESSLY
WAIVES, RENOUNCES AND KNOWINGLY RELINQUISHES ANY LEGAL RIGHT WHICH MIGHT
OTHERWISE REQUIRE SECURED PARTY TO ENFORCE





                                      -6-
<PAGE>   7
ITS RIGHTS BY JUDICIAL PROCESS.  IN SO PROVIDING FOR A NON-JUDICIAL REMEDY,
DEBTOR RECOGNIZES AND CONCEDES THAT SUCH A REMEDY IS CONSISTENT WITH THE USAGE
OF THE TRADE, IS RESPONSIVE TO COMMERCIAL NECESSITY AND IS THE RESULT OF
BARGAINING AT ARMS LENGTH.  NOTHING IN THIS AGREEMENT IS INTENDED TO PREVENT
DEBTOR OR SECURED PARTY FROM RESORTING TO JUDICIAL PROCESS AT EITHER PARTY'S
OPTION.

       (j)    Debtor agrees that in performing any act under this Agreement
that time shall be of the essence and that Secured Party's acceptance of a
partial or delinquent payment or payments, or the failure of Secured Party to
exercise any right or remedy shall not be a waiver of any obligation of Debtor
or any right of Secured Party or constitute a waiver of any other similar
default subsequently occurring.

       (k)    Debtor hereby agrees to cooperate fully with Secured Party in
order to permit Secured Party to sell, whether at foreclosure or at other
private sale, the Collateral as permitted hereunder.  Specifically, Debtor
agrees to comply fully with the securities laws of the United States of America
and applicable state securities laws and to take such action as may be
necessary to permit Secured Party to sell or otherwise transfer the securities
pledged hereunder in compliance with such laws.  Without limiting the
foregoing, Debtor, at its own expense, upon request of Secured Party, agrees to
cause and/or obtain such registration, filings, statements, rulings, consents
and other matters as Secured Party may request.

       (l)    Debtor hereby appoints Secured Party as its attorney-in-fact to
complete, execute and file with the United States Securities and Exchange
Commission one or more notices of proposed sale of securities pursuant to Rule
144 under the Securities Act of 1933 and/or any similar filings or notices with
any applicable state agencies, and said attorney-in-fact shall have the full
power and authority to do, take and perform every act necessary to be done in
the exercise of that right as fully as Debtor might or could do if personally
present.  This power shall be irrevocable during the term of this Agreement and
deemed coupled with an interest.  The rights pursuant to said attorney-in-fact
herein granted shall commence and be in full force and effect from the date of
this agreement and shall remain in full force and effect and shall not be
rescinded, revoked, terminated, amended or otherwise modified until the
termination of this Agreement.

       (m)    Because of applicable securities laws, including without
limitation, the Securities Act of 1933, the Texas Securities Act and other
applicable state securities laws, there may be legal restrictions or
limitations affecting attempts of Secured Party to dispose of the Collateral in
enforcement of its rights and remedies hereunder.  Secured Party is hereby
authorized by Debtor, but not obligated, upon an Event of Default, to sell all
or any part of the Collateral as permitted hereunder at private sale, subject
to investment letters or in any other manner which will not require the
Collateral or any part thereof, to be registered in accordance with the
Securities Act of 1933, as amended, or the rules and regulations promulgated
thereunder, or any other applicable





                                      -7-
<PAGE>   8
securities law or regulation.  Debtor specifically agrees that under these
circumstances such a sale is a commercially reasonable method of disposition of
the Collateral.  Secured Party is also hereby authorized by Debtor, but not
obligated, to take such actions, give such notices, obtain such rulings and
consents, and do such other things as Secured Party may deem appropriate in the
event of a sale or disposition of any of the Collateral.  Debtor acknowledges
that Secured Party may, in its reasonable discretion, approach a restricted
number of potential purchasers and that a sale under such circumstances may
yield a lower price for the Collateral or any part or parts thereof than would
otherwise be obtainable if the same were registered and sold in the open
market.  Debtor agrees that such private sale shall constitute a commercially
reasonable method of disposing of the Collateral in view of the time, expense,
and potential liability to the parties of such transactions of registration of
the Collateral in accordance with applicable securities laws.

                           Section 6.  Miscellaneous

       6.1    Pronouns.  The pronouns used in this instrument are in the
masculine gender but shall be construed as feminine or neuter as occasions may
require.

       6.2    Parties.  "Secured Party" and "Debtor" as used in this instrument
include the successors, representatives, receivers, and assigns of those
parties.

       6.3    Section Headings.  The section headings appearing in this
instrument have been inserted for convenience only and shall be given no
substantive meaning or significance whatever in construing the terms and
provisions of this instrument.

       6.4    Defined Terms.  Terms used in this instrument which are defined
in the Texas Business and Commerce Code are used with the meanings as therein
defined.

       6.5    Applicable Law, Place of Payment.  The law governing this secured
transaction shall be that of the State of Texas in force at the date of this
instrument, and all payments and obligations hereunder shall be made and
performed in Harris County, Texas.

       6.6    Notices.  All notices, requests, demands and other communications
which are required or may be given under this Agreement shall be in writing and
shall be deemed to have been duly given if delivered personally or by courier,
or mailed by first class mail, postage prepaid, return receipt requested, or
sent by facsimile, as follows:

              (1)    If to the Debtor:

                     Mr. Jay Silverman
                     50 Briar Hollow Lane, 6th Floor West
                     Houston, Texas 77027
                     Facsimile:  (713) 881-2801





                                      -8-
<PAGE>   9
              (2)    If to Secured Party:

                     Eagle Geophysical, Inc.
                     50 Briar Hollow Lane, 6th Floor West
                     Houston, Texas 77027
                     Facsimile:  (713) 881-2801
                     Attn:  Mr. Richard W. McNairy

or to such other address as either party shall have specified by notice in
writing to the other party.  All such notices, requests, demands and
communications shall be deemed to have been received on the earlier of the date
of delivery or on the fifth business day after the mailing thereof.

       6.7    Severability.  In the event any of the provisions contained in
this Agreement shall for any reason be held to be invalid, illegal or
unenforceable in any respect, such provision shall not affect the validity,
legality or enforceability of any other terms or provisions of this Agreement
and, to the extent permitted by applicable law, a valid, legal and enforceable
provision substantially similar to the invalid, illegal or unenforceable
provision shall be substituted in lieu thereof.

       6.8    Waiver of Rights.  In the event that Debtor is not the Borrower
or Maker as defined in the Note, Debtor waives any right to require Secured
Party to file suit against the Borrower or Maker or take any other action
against Borrower or Maker or Borrower's or Maker's property as a prerequisite
to Secured Party's taking any action or bringing any suit against Debtor under
this Security Agreement.





       EXECUTED effective the ____ day of __________, 1997.



                                       DEBTOR:
                                       
                                                  
                                       ----------------------------------------
                                       JAY N. SILVERMAN
                                       
                                       
                                       SECURED PARTY:
                                       
                                       
                                       EAGLE GEOPHYSICAL, INC.
                                       
                                       
                                       BY:
                                          -------------------------------------
                                           RICHARD W. MCNAIRY, Vice
                                           President-Chief Financial Officer
                                       
                                       



                                      -9-

<PAGE>   1

                                                                       10.33.1
           THE BANK OF N.T. BUTTERFIELD & SON LIMITED - LONDON BRANCH
                         OFFER OF TERM LOAN FACILITIES
                                  The Schedule

================================================================================
  Date:  27 February 1995
- --------------------------------------------------------------------------------
  Borrower:        Horizon Exploration Limited
                   6 Pembroke Road
                   Sevenoaks
                   Kent
                   TN13 1XR
- --------------------------------------------------------------------------------
  Currency and Loan Amount:         Up to a maximum sum of USD 2,000,000 (Two
                                    Million United States Dollars).
- --------------------------------------------------------------------------------
  Purpose:         To finance the purchase of Marine Seismic Digital Streamer
                   Sections and Modules which are currently the subject of the
                   A.T. & T Lease.
- --------------------------------------------------------------------------------
Interest Rate the aggregate of:  2.00% p.a. (per centum per annum) above
LIBOR and Reserve Assets Costs.
- --------------------------------------------------------------------------------
  Interest Periods:  Three month LIBOR.
- --------------------------------------------------------------------------------
Loan Maturity Date: Subject to the terms of this Offer and no Event of Default
or Potential Event of Default having occurred, the final instalment of the Debt
shall be repayable on the date occurring, thirty months following the Drawdown
Date.  
- --------------------------------------------------------------------------------
Security:

  a)       A Chattel Mortgage in a form acceptable to the Bank over the assets
           financed under the A.T. & T.  Lease.

  The security to be given by the Borrower to the Bank under the General
  Banking and Contract Finance Facility will also constitute security for the
  Borrower's liabilities hereunder and for the avoidance of doubt includes
  inter-alia the following;

  a)       A Debenture incorporating First Fixed and Floating charges over all
           the Borrower's assets, undertakings and property; and

  b)       A Letter of Hypothecation and Pledge; and

  c)       A Set Off and Charge

  d)       The Guarantee of Seismic Exploration Limited supported by a Third
           Party Charge over the Panamanian registered "M/V Caribbean Horizon".

  e)       The Guarantee of Exploration Holdings Limited.

  f)       The Assignments of the Life Policies on the lives of Mr G Harrison,
           Mr N Campbell and Mr G Purdie with each life being insured for not
           less than L.250,000.

  g)       Assignments of the proceeds payable under the Contracts.

  h)       The Letter of Comfort from the Majority Shareholder.

- --------------------------------------------------------------------------------
  Arrangement Fee:  1% of the Facility.
- --------------------------------------------------------------------------------





                                       1
<PAGE>   2
- --------------------------------------------------------------------------------
  Repayment Arrangments:

  i)       The Loan Amount is to be repaid in quarterly instalments with the
           first repayment falling due on the 30 June 1995 and thereafter each
           instalment of principal is to be paid by the Borrower to the Bank on
           the Bank's Quarter End Dates with the final repayment being thirty
           months from the Drawdown Date.

  ii)      Interest Payments are to be made by the Borrower on the Bank's
           Quarter End Dates with the first such interest payment date being
           the 30 June 1995 and thereafter on each Quarter End Date with the
           final interest payment date being thirty months from the Drawdown
           Date.
- --------------------------------------------------------------------------------
  * Special Conditions apply and are listed on the Continuation Sheet.
- --------------------------------------------------------------------------------

================================================================================




                                       2
<PAGE>   3
================================================================================
                            THE SCHEDULE (Continued)
  Special Conditions:

  A) PRIOR TO DRAWDOWN UNDER THE FACILITY THE BANK IS TO RECEIVE THE FOLLOWING
  IN A FORM AND SUBSTANCE WHICH IS ACCEPTABLE TO THE BANK AND ITS LEGAL
  ADVISORS.

  i)       Your written acceptance of the Facility in accordance with the terms
           of this offer; and

  ii)      Written confirmation from the relevant insurers that the Borrower
           has in place adequate insurance cover for the business and its
           assets with the Bank named as first loss payee; and

  iii)     A duly completed and signed Drawdown Notice in the form attached;
           and

  iv)      A copy, certified as true and accurate by a Director or the
           Borrower's Secretary of a resolution of the Borrower's Board of
           Directors agreeing to accept the Facility on the terms of this offer
           and authorizing an officer or officers of the Borrower to sign the
           enclosed copy of this letter, any security documentation or
           ancillary documentation related hereto and also execute any other
           notices, advices and instructions whatsoever which from time to time
           may be issued or provided under the Facility; and

  v)       Written confirmation signed by the Borrower and addressed to the
           Bank confirming that;

           a)      The Borrowers Memorandum and Articles of Association, a
                   certified copy of which is held on the Bank's files, have
                   not been amended or altered in any manner whatsoever.

           b)      That the Bank may continue to rely on the Resolutions passed
                   by the Borrower on the 8 August 1994 and the signature
                   mandate executed by the Borrower.

           c)      The Borrower will continue to be bound by the General
                   Conditions signed by the Borrower on the 8 August 1994.

  vi)      A copy of this letter signed by Seismic Exploration Limited and
           Exploration Holdings Limited as guarantors; and

  vii)     A deed (Deed of Subordination) in a form acceptable to the Bank
           signed by the Majority Shareholder, postponing repayment of the
           principal of the Majority Shareholders Loan until 30 September 1996
           at the earliest; and

  viii)    A Copy, certified as true and accurate by a Director or the Company
           Secretary of a resolution passed by the Company amending the
           Articles of Association making the payment of dividends to the
           shareholders subject to the terms of the Deed of Subordination.

================================================================================




                                       3
<PAGE>   4
================================================================================

  B)       THE FOLLOWING SPECIAL CONDITIONS WILL CONTINUE TO APPLY THROUGHOUT
           THE TERM OF THIS FACILITY:

  i)       The Security provided under the Facility will also constitute cross
           collateralisation for the General Banking and Contract Finance
           Facility; and

  ii)      No utilisation of the Facility may be requested by the Borrower if
           an Event of Default or Potential Event of Default shall have
           occurred which has not been expressly waived by the Bank in writing
           or which has not been remedied to the Bank's satisfaction or would
           result from such utilisation.

  iii)     Nothing contained in this offer letter shall restrict the operation
           of any general lien, right of set off or any other rights or
           remedies whatsoever which the Bank may have whether by law or
           otherwise; and

  iv)      No payment of dividends or repayments of principal under the
           Shareholders Loan by the Borrower is permitted without the Bank's
           prior written consent.

  v)       The Borrower is to comply with the following financial covenants
           which will be tested against the Borrower's accounts for financial
           year ending 31 December 1995.

           a)      Gearing                   :       Not greater than 0.80:1.
           b)      Leverage                  :       Not greater than 2:1.
           c)      Interest Cover            :       Not less than 3.75 X.
           d)      Net Worth                 :       Not less then L.3,600,000.

           Financial Covenants for subsequent years will be notified to the
           Borrower by way of an amendment to this letter.  Note the following
           definitions apply in respect of the financial covenants.

  "Gearing" means all the Borrowers interest bearing debt net of cash balances
held to Net Worth.

  "Leverage" means all balance sheet liabilities to Net Worth.

  "Interest Cover" means operating profits before net interest payable.

  "Net Worth" means paid-up share capital, the retained earnings plus the
Majority Shareholders Loan less intangible assets and non-quoted investments.


================================================================================



                                       4
<PAGE>   5
TO:              The Borrower named in the Schedule

FROM:            THE BANK OF N.T. BUTTERFIELD & SON LIMITED - LONDON BRANCH 24
                 Chiswell Street London EC1Y 4TY

We, The Bank of N.T. Butterfield & Son Limited through our London Branch ("the
Bank"), hereby Offer to make available to you ("the Borrower") a banking
accommodation in the form of a term loan facility, as mentioned in the Schedule
attached hereto (the Schedule) in the Currency and up to the aggregate Loan
Amount specified in the Schedule, on the following terms and conditions.

It is a term of this Offer that, if you, the Borrower, are more than one person
or corporate body, the liability of each such person or corporate body in
connection with the Facility will be a joint and several liability.

1.       DEFINITIONS

In this Offer and the Schedule hereto, unless the context otherwise requires,
the following words and expressions have the following meanings:

1.1      "The Advance"            means an advance of the Facility made by the
                                  Bank to the Borrower hereunder to repay AT &
                                  T Capital Limited

1.2      "Banking Day"            means a day (excluding Saturdays) on which
                                  banks are open for normal business in the
                                  City of London

1.3      "Conditions"             means the Bank's General Conditions which
                                  govern all transactions between the Bank and
                                  the Borrower

1.4      "Currency"               means the currency specified in the Schedule
                                  in which the Loan Amount is to be made
                                  available and in which all payments are to be
                                  made by you pursuant to the terms of this
                                  Offer

1.5      "Debts"                  means the total amount in the Currency from
                                  time to time outstanding and owed by you to
                                  us pursuant to the terms and conditions of
                                  this Offer including without limitation all
                                  Principal and accrued interest owing under
                                  the Facility, costs and expenses payable in
                                  respect thereof

1.6      "Drawdown Date"          means the date upon which the Advance is made
                                  by the Bank to the Borrower

1.7      "Drawdown Notice"        means a notice in the form of Appendix I
                                  attached hereto

1.8      "Facility"               means the Loan Amount in the Currency
                                  specified in the Schedule





                                       5
<PAGE>   6
1.9      "Interest Payment Dates" means the Banking Day upon which you are
                                  required to pay to us interest in respect of
                                  the Facility in accordance with the Schedule.

1.10     "Interest Period"        means each period of time specified for the
                                  calculation of interest in accordance with
                                  the terms of this Offer of which the first
                                  such Interest Period will commence on the
                                  Drawdown Date and will end on the 30 June
                                  1995 and the last such Interest Period will
                                  end on the Loan Maturity Date

1.11     "Interest Rate"          means the rate of interest specified in the
                                  Schedule

1.12     "LIBOR"                  means the rate of interest conclusively
                                  determined by us at which the Bank is able in
                                  accordance with the Bank's normal practice to
                                  acquire the Currency in the London Inter-Bank
                                  market from prime banks for an amount
                                  comparable with the relevant instalment of
                                  the Facility or the Debt (as the
                                  circumstances require) for the Interest
                                  Period in question in the case of Pounds
                                  Sterling at or at about 11.00 a.m. London
                                  time on the first day of that Interest Period
                                  for value that day and in the case of United
                                  States Dollars at or about 11.00am London
                                  time on the second Banking Day prior to the
                                  first day of that Interest Period for value
                                  on the first day of that Interest Period

1.13     "Loan Maturity Date"     means the date specified in the Schedule on
                                  which the Facility will cease to be available
                                  and on which you are required to repay the
                                  Debt to us

1.14     "AT & T Lease"           means the Lease facility made available by AT
                                  & T Capital Limited of 66 Buckingham Gate,
                                  London, SW1E 6AU to the Borrower

1.15     "Security"               means the Security over assets and/or
                                  commitments of the Borrower and/or any other
                                  person mentioned in the Schedule under the
                                  heading "Security to be Taken" together with
                                  any additional security required by the Bank
                                  from time to time

1.16     "Security Documents"     mean those documents referred to in the
                                  Schedule under the heading "Security to be
                                  Taken" which are to effect or comprise the
                                  Security together with any further Security
                                  documents executed from time to time

1.17     "The General Banking and
         Contract Finance
         Facility"                means the facility made available by the Bank
                                  Contract Finance Facility" to the Borrower as
                                  per the letter dated 23 August 1994

1.18     "Reserve Asset Costs"    means the cost if any to the Bank of
                                  complying with the Reserve Asset, Special
                                  Deposit and other monetary control or similar
                                  requirements of the Bank of England and/or
                                  any other competent authority from time to





                                       6
<PAGE>   7
                                  time expressed as a percentage per annum and
                                  (if not an integral multiple thereof),
                                  rounded up to the nearest 1/16 of 1 per cent.

1.19     "Majority Shareholder"   means Energy Research International Limited,
                                  c/o Caledonian Bank and Trust Limited, PO Box
                                  1045, Georgetown Grand Cayman, Cayman Islands

1.20     "Majority Shareholder's" means the loan granted to the Borrower by
                                  Energy Research International Limited

1.21     "Quarter End Dates"      means the last Banking Day of March, June,
                                  September and December

1.22     "Events of Default"      means the events specified in clause 13

1.23     "Deed of Subordination"  means a Deed of Subordination in a form
                                  acceptable to the Bank, to be entered into
                                  between the Borrower, the Majority
                                  Shareholder and the Bank

2.       PURPOSE OF THE FACILITY AND DRAWDOWN

2.1      The Facility is to be provided for the purpose specified in the
         Schedule to be drawn in one amount and thereafter the Borrower will be
         obliged to supply such evidence as the Bank may from time to time
         require to demonstrate the application of the Facility for this
         purpose.

2.2      The availability of the Facility will depend upon the Borrower's
         ability to satisfy the conditions precedent mentioned in clause 7.

3.       INTEREST PERIODS

3.1      If any Interest Period ends on a day which is not a Banking Day, it
         will be extended to end on the next succeeding Banking Day unless the
         next succeeding Banking Day falls in the next quarterly Interest
         Period in which event the Interest Period will be shortened so as to
         end on the immediately preceding Banking Day.

3.2      If any Interest Period commences on the last Banking Day in a calendar
         month or if there is no corresponding date in the calendar month in
         which an Interest period is due to end, then such Interest Period
         shall end on the last Banking Day in the relevant later month

4.       FEES, INTEREST AND COSTS

4.1      The Borrower is required to pay the Bank the Arrangement Fee mentioned
         in the Schedule upon the Borrowers acceptance of this Offer.

4.2      Interest on the Debt will be payable by the Borrower in arrears on the
         Interest Payment Dates.

4.3      Interest will accrue from day to day and will be calculated on the
         amount of the Debt outstanding on the basis of actual days elapsed.
         The calculation will be based upon a year of 360 days.





                                       7
<PAGE>   8
4.4      Where the Bank considers that the amount involved is a material sum,
         the Borrower will also be required to pay to the Bank additional
         interest on the Debt for each Interest Period so as to compensate the
         Bank for any cost incurred or loss suffered by the Bank by reason of
         any additions or changes to any applicable law, regulation,
         requirement, directive or request (whether or not having the force of
         law) from the Bank of England or any other relevant fiscal, monetary
         or other competent authority or in the interpretation of any such
         matters by any governmental or regulatory authority or any Court of
         competent jurisdiction.

4.5      If on the first day of an Interest Period the Bank determines that
         United States Dollar deposits of the relevant amount or period are not
         available to the Bank or the Bank is unable to determine the Interest
         Rate thereof, the rate of interest applicable to the Facility during
         that Interest Period shall be 2.00% per cent above the rate per annum
         determined by the Bank to be the cost of funds to the Bank for similar
         amount and period from such source as the Bank may consider
         appropriate.

4.6      Any certificate of termination by the Bank as to any rate of interest
         payable in respect of the Facility shall (save for manifest error, be
         conclusive).

4.7      The Borrower is required to pay to the Bank on demand the amount of
         all legal (including all registration and other fees) and other costs
         and expenses and Value Added Tax thereon incurred by the Bank in
         Connection with the negotiation, preparation and completion of this
         Offer and the Security Documents whether or not the Facility becomes
         available together with all costs and expenses incurred in connection
         with the enforcement of or preservation of any rights under this Offer
         and/or of the Security Documents.

5.       REPAYMENT

5.1      The Borrower will repay the Debt in accordance with the Schedule.

5.2      No part of the Facility repaid may be redrawn.

6.       PREPAYMENT

6.1      No prepayment may be made within the first six months following the
         Drawdown Date.  Thereafter, providing that the Borrower shall have
         given the Bank not less than five Banking Days prior notice (which
         will be irrevocable and binding), prepayments of the Facility may be
         made on Interest Payment Dates in amounts of not less than USD 200,000
         (Two Hundred Thousand United States Dollars). Such prepayment shall
         include all interest due and payable on the amount prepaid.

6.2      No amount of the Facility prepaid may be redrawn and the Borrower may
         not make any prepayment other than in accordance with the terms of
         this Offer.

7.       CONDITIONS PRECEDENT AND SECURITY

7.1      As a condition precedent to the Facility becoming available and as
         security for the repayment of all monies owed by the Borrower to the
         Bank (including all monies outstanding under the General Banking and
         Contract Finance Facility as well as all other liabilities or
         obligations owed by the





                                       8
<PAGE>   9
         Borrower to the Bank, from time to time) and the performance by the
         Borrower of all its obligations, the Borrower is required to deliver
         to the Bank documents and items as specified in the Schedule.

8.       PAYMENT

8.1      All payments received by the Bank from the Borrower will be applied
         first, towards the reimbursement of the Bank's costs, charges and
         expenses on a full indemnity basis secondly, in payment of interest
         due up to the date of payment thirdly, in payment of the Debt and
         fourthly in payment of any surplus to the Borrower's account with the
         Bank.

8.2      All sums payable by the Borrower in connection with the Facility must
         be paid to the Bank no later than midday on the due date in the
         Currency in London and in cleared funds.  Any such payment must be
         free and clear of any present or future taxes, charges or withholdings
         and without any set-off or counterclaim or any restriction, condition
         or deduction.

8.3      If the Borrower is legally obliged to make any deduction or
         withholding the Borrower must promptly pay to the Bank an additional
         amount so as to ensure that the amount actually received by the Bank
         is the full amount which would have been received if there had been no
         deduction or withholding.  Such an additional amount will be treated
         as agreed compensation rather than as interest.

8.4      If the Borrower fails to make a payment in the proper manner when due,
         the Borrower must indemnify the Bank against all losses and expenses
         which the Bank incurs and, in the case of late payment, pay to the
         Bank by way of agreed compensation interest on the sum due at the rate
         of 4% per annum above LIBOR for such Interest Period or successive
         Interest Periods as the Bank select (which for the purpose of this
         clause means any period of time selected by the Bank for the
         calculation of that interest including overnight deposit rate) and
         with the interest being compounded at the end of each such period
         until payment is made.

8.5      The Bank's Certificate as to the amount of any sum due from the
         Borrower to the Bank will (in the absence of manifest error) be
         binding upon you.

9.       REPRESENTATIONS, WARRANTIES AND UNDERTAKINGS

         In accepting this Offer the Borrower represents, warrants and
         undertakes that now and so long as any amount remains outstanding or
         any interest, fees, costs, expenses or any other liabilities actual or
         contingent remain due or may become due to the Bank hereunder, that:

9.1      The Borrower is duly incorporated and validly existing under the laws
         of England and has all the necessary powers to enter into and comply
         with the terms and conditions of this Offer and the Security Documents
         and furthermore the Borrower has complied with all material, statutory
         and other requirements (legal or otherwise) relative to its business;
         and

9.2      The Borrower's total borrowings and liabilities actual or contingent,
         including any sums outstanding hereunder, are within its powers under
         its Memorandum and Articles of Association; and





                                       9
<PAGE>   10
9.3      All official consents and or approvals required to accept the Offer
         have been obtained and are in full force and effect and the Borrower
         is not by the acceptance of the Offer, contravening any existing
         applicable law or regulation or any contractual or other restriction
         or limitation binding on the Borrower; and

9.4      There are no actions, suits or proceedings pending against the
         Borrower nor to the Borrower's knowledge after due enquiry, threatened
         against the Borrower or any of its assets or revenues which could or
         might have a material adverse effect on the financial condition or
         otherwise of the Borrower; and

9.5      The Borrower will promptly advise and inform the Bank on becoming
         aware of any Event of Default or Potential Event of Default as defined
         in Clause 13; and

9.6      Since the date of the last audited accounts for the Borrower (copies
         of which have been delivered to the Bank) to the best of the
         Borrower's knowledge there have been no material or adverse changes in
         the business, assets or financial condition; and

9.7      The Borrower's obligations hereunder will at all times, during the
         term of the Facility, rank pari-passu with the existing indebtedness
         under the General Banking and Contract Finance Facility but rank in
         priority to any other existing and/or future indebtedness or
         commitments other than those commitments which by law will
         automatically rank in priority; and

9.8      All the information supplied to the Bank in connection with the
         negotiation and preparation of the terms of the Facility is to the
         best of the Borrower's knowledge true and correct and not misleading
         and furthermore the Borrower has disclosed everything which the Bank
         could reasonably expect the Borrower to consider to be material in
         connection herewith.

The Representations, Warranties and Undertakings will be deemed to be repeated
by the Borrower on each Interest Payment Date as if made with references to the
facts and circumstances existing at such respective date.

10.      COVENANTS

         So long as amounts remain outstanding under the Facility the Borrower
         shall:

10.1     Not create or permit to arise any mortgage, debenture, charge, pledge
         lien or any other encumbrance or security whatsoever over any part of
         the Borrower's present or future undertaking, assets or revenues
         without the Bank's prior written consent, which shall not be
         unreasonably withheld; and

10.2     Notify the Bank in writing of any material change in the nature of the
         Borrower's business as carried on at the date hereof which may involve
         acquisition, disposal or otherwise, of the whole or any substantial
         part of the Borrower's undertaking, property or assets except for
         stock in trade and in particular but without limitation, you will not
         without the consent of the Bank grant or agree to grant any lease or
         other interest in the Security Property or any part of it; and

10.3     Ensure that insurances on and in relation to the Borrower's business
         and assets are maintained with reputable underwriters or Insurance
         companies against such risks and to such extent as is





                                       10
<PAGE>   11
         usual for companies carrying on a business such as that carried on by
         the Borrower and the Bank's interests noted thereon; and

10.4     Not, without prior written consent from the Bank, make any loan or
         give any credit to any person other than normal trade credit;

10.5     Except under this Facility or the General Banking and Contract Finance
         Facility borrow or raise any money or incur credit or give any
         guarantees indemnities or other assurances against financial loss
         other than, subject to in each case, the prior written approval of the
         Bank which shall not be unreasonably withheld, lease agreements
         entered into from time to time by the Borrower for the purchase of
         capital equipment;

10.6     Sell, transfer, lend or otherwise dispose of all or any part of your
         present or future undertaking, assets right or revenues (whether
         transactions are related or not);

10.7     Enter into negotiations with the Bank in the event that the Bank's
         legal advisors recommend that the existing security be amended and/or
         that the Bank should seek additional security, to secure the
         Borrower's liabilities hereunder and provide such additional security
         as may be required; and

10.8     Agree to provide the Bank with such additional financial information
         as it may reasonably request in connection with the Facility.

11.      FINANCIAL REPORTING REQUIREMENTS

         The Borrower is required to deliver to the Bank the following
         financial information;

11.1     Within seven days of the end of each monthly trading period;

         i)      Management prepared profit and loss account together with aged
                 debtors and creditors analysis; and

11.2     Within twenty one days of the end of each three month accounting
         period;

         i)      A comparison of Management prepared Balance Sheet and Profit
                 and Loss Account against financial projections and forecasts
                 for the same period; and

         ii)     Projected cash flow forecasts for the next six months trading;
                 and

11.3     Within Ninety days of each financial year end;

         i)      Two copies of the Borrower's Annual Audited Report and
                 Accounts together with a certificate of compliance signed by
                 the Borrower's Secretary or the Borrower's auditors; and

         ii)     Cash flow forecasts and budgets for the next twelve months
                 trading





                                       11
<PAGE>   12
12.      THE BANK'S RIGHT OF SET-OFF AND CONSOLIDATION

         It is hereby agreed and declared that in addition to any right of
         set-off or other similar right to which the Bank may be entitled by
         law, the Bank may at any time and without notice to the Borrower
         combine and consolidate all or any accounts between the Borrower and
         the Bank and/or set-off any moneys whatsoever and whether on current
         account or deposit account which the Bank may at any time hold for the
         account of the Borrower against any liabilities whatsoever whether
         such liabilities are actual or contingent and whether owed as
         principal or surety.

13.      EVENTS OF DEFAULT

         Notwithstanding anything herein contained and without limitation to
         the Bank's rights hereunder the Bank shall on the occurrence of any of
         the following events of default be entitled to terminate the Facility
         and demand from the Borrower either, immediate repayment of or full
         cash cover for all the debt. At the same time the Bank will require a
         payment from the Borrower for any losses and expenses (including loss
         of profit) incurred or suffered by the Bank in consequence of an Event
         of Default. The Bank's certificate as to the amount of such losses and
         expenses shall be conclusive save for manifest error.

13.1     Each of the following shall be an Event of Default namely:

         i)      If the Borrower defaults in the payment of any monies which
                 may become due to the Bank or there shall be any breach by the
                 Borrower or any other party of the terms and conditions of the
                 Offer, the General Banking and Contract Finance Facility, the
                 Deed of Subordination, or any other facility letter,
                 guarantee, security agreement, document or other obligation
                 which the Borrower may, from time to time have with the Bank,
                 its associates or subsidiaries; or

         ii)     If any representation, warranty, undertaking or covenant from
                 time to time made or deemed to have been made by the Borrower
                 to the Bank, its associates or subsidiaries is incorrect or
                 misleading or if any of the terms and conditions of the Offer
                 (including for the avoidance of doubt the special conditions
                 listed in the Schedule) or any other obligation or liability
                 of the Borrower to the Bank, its associates or subsidiaries is
                 not fulfilled; or,

         iii)    If the Borrower defaults or receives notice of default under
                 any trust, deed, debenture, loan agreement, guarantee (which
                 expression shall include all contingent liabilities undertaken
                 in respect of the obligations or liabilities of any third
                 party including all guarantees, indemnities, bonds or
                 instruments of suretyship whether constituting primary or
                 secondary obligations or liabilities whatsoever their
                 designation) or if money payable thereunder becomes due and is
                 not paid on or before the due date or if any surety created by
                 the Borrower becomes enforceable; or

         iv)     If a petition is presented or any order made or a resolution
                 passed for the winding up of the Borrower, or if the Borrower
                 is dissolved or a notice is issued concerning a meeting for
                 the purpose of passing any such resolution or a resolution to
                 reduce or redeem all or any part of the Borrower's issued
                 share capital or of considering whether any and if so what
                 measures should be taken to deal with the situation referred
                 to in Section 142 of the





                                       12
<PAGE>   13
                 Companies Act 1985 (or any mandatory or statutory re-enactment
                 thereof) or if the Borrower ceases or threatens to cease to
                 carry on its business or any substantial part thereof in the
                 normal course, save in any such case for the purpose of and
                 followed within six months by an amalgamation or
                 reconstruction not involving or arising out of insolvency on
                 terms previously approved by the Bank in writing; or

         v)      If any encumbrancer shall take possession or a receiver,
                 trustee, administrative receiver, administrator or similar
                 officer shall be appointed to the whole or any part of the
                 Borrower's undertaking, property or assets or if any judgement
                 or order made against the Borrower is not complied with within
                 seven days or if any execution, distress, or other process be
                 levied or enforced upon or sued out against any of the
                 Borrower's property, assets or revenues; or

         vi)     If the Borrower becomes or is deemed to be unable to pay debts
                 as and when they fall due whether within the meaning of
                 Section 123 of the Insolvency Act 1986 (or any mandatory or
                 statutory re-enactment thereof) or otherwise or if a notice is
                 issued convening a meeting of or the Borrower proposes to
                 enter into any composition or arrangement with its creditors
                 or agrees or declares a moratorium in respect of any of its
                 debts or stops payment or if notice is given to the nominee
                 referred to in Part 1 of the Insolvency Act 1986 (or mandatory
                 or statutory re-enactment thereof) of an intended proposal for
                 any such voluntary arrangement in that part of the Act or if a
                 substantial part of the Borrower's business property assets or
                 capital is nationalised, seized or appropriated; or

         vii)    If there is at any time a change in the voting control of the
                 Borrower which the Bank considers material or if without the
                 Bank's prior written consent control of the Borrower should
                 pass to any person or group of persons (as defined in Section
                 839 of the Income and Corporation Taxes Act 1988) (or any
                 mandatory or statutory re-enactment thereof) or institution or
                 group of institutions not having control at the date hereof;
                 or

         viii)   If any material provision of this Offer or any security given
                 in respect thereof ceases in any respect to be in full force
                 and effect or to be continuing or is purported to be
                 determined or becomes in jeopardy or is invalid or
                 unenforceable; or

         ix)     If any suspension of payments is filed by the Borrower under
                 any applicable bankruptcy law or similar statute; or

         x)      If any waiver of consent, (governmental or otherwise),
                 required for the validity enforceability or performance of the
                 Facility is for any reason is not provided or is withdrawn or
                 ceases to be in full force and effect; or

         xi)     If the Bank considers that the Borrower's financial position
                 is deteriorating or has deteriorated so as to place in
                 jeopardy the repayment of any amounts which will become due or
                 outstanding hereunder; or

         xii)    If, without the Banks prior written consent, which shall not
                 be unreasonably withheld, the Borrower makes any fundamental
                 changes to its Memorandum and Articles of Association.





                                       13
<PAGE>   14
13.2     The Borrower will immediately notify the Bank in writing of the
         occurrence of any Event of Default (with the exception of Clause 13.1
         xi. above). No failure or delay on the Bank's part in exercising any
         right hereunder shall operate as a waiver thereof nor shall any single
         or partial exercise of any such right preclude its further exercise.

13.3     Any of the events described in clause 13.1 above which occur in
         relation to any present or future holding Company, and/or subsidiaries
         as defined in Section 736 of the Companies Act 1985 (or any mandatory
         or statutory re-enactment thereof) and/or the Guarantors which has a
         material and/or adverse effect (financial or otherwise) will also be
         deemed to be an Event of Default.

13.4     For the purpose of this Offer, Potential Event of Default shall mean
         any event which with the giving of notice and/or lapse of time and/or
         making any determination by the Bank would constitute an Event of
         Default.

14.      NOTICES

14.1     In addition to (and not by way of limitation of) the provisions for
         service specified in the Security Documents, all notices in connection
         with this Offer may be sent by us by first class letter post, cable,
         telex or facsimile transmission or delivered by hand to you at the
         address set out in the Schedule and will be deemed to have been
         served:

         i)      in the case of a letter - on the day upon which it could be
                 expected to arrive in the ordinary course of post and in any
                 event within five Banking Days;

         ii)     in the case of a cable - one Banking Day after the day of
                 dispatch;

         iii)    in the case of a telex or facsimile transmission or hand
                 delivery - on the day of transmission or delivery or, if that
                 day is not a Banking Day or the timing of the transmission or
                 delivery is such that it would reach the recipient after 5.00
                 p.m. (in the place of receipt) on that day, the following
                 Banking Day.

14.2     All notices under this Offer and all instructions in connection with
         the Facility may be given by you (or by an authorised officer in the
         case of a Borrower) by first class letter post, cable or telex or
         facsimile transmission to us at our principal office for the time
         being in London or at such other office as we may notify to you in
         writing.

14.3     A complete copy of any notice or instruction in connection with this
         Offer effected by telex or facsimile transmission must, in order for
         that notice to have effect, be sent to the recipient by first class
         post as soon as possible after the transmission has been completed.  A
         notice or instruction thus transmitted will be effective
         notwithstanding any incomplete or distorted transmission and in
         proving service it will be sufficient to prove that the notice or
         instruction was transmitted to the correct number from which the
         correct answerback or other appropriate acknowledgment of receipt was
         obtained and that a complete copy was thereafter dispatched to the
         recipient by first class letter post.





                                       14
<PAGE>   15
15.      CURRENCY AND FOREIGN EXCHANGE RISK

15.1     Notwithstanding your basic liability to make payment to us in the
         Currency, where the terms of this Offer require you to pay or to
         reimburse to us any costs, expense or loss incurred or suffered by us
         in connection with the Facility and/or the Debt or otherwise as
         contemplated by this Offer, your primary liability will be to pay or
         to reimburse to us the amount in question in the currency in which the
         cost, expense or loss has been incurred or suffered by us and such
         amount will only be added to the Debt and (if necessary) converted
         into the Currency the manner mentioned in clause 15.2 if you fail to
         discharge that primary liability in due time in accordance with the
         terms of this Offer.

15.2     This clause applies to all cases where the value of the Security or
         any part of the Security by reason of its nature or location is most
         readily determinable in a currency other than the Currency.  In all
         such cases you are required to bear the primary risk of all currency
         fluctuations and we reserve the right to require you to repay a part
         of the Debt or to provide additional security for the Debt if at any
         time in our opinion the aggregate value of the Security (when
         converted into the Currency at the spot rate of exchange conclusively
         determined by the Bank in accordance with the Bank's normal practice)
         as related to the amount of the Facility or the Debt (as the case may
         be) is less favorable to the Bank by reason of currency fluctuations
         than it is now at the date of this Offer. We may exercise this right
         at any time and on more than one occasion if we so decide.  If and
         when we exercise our rights in this respect, you will bound
         immediately to effect the required reduction in the Debt (which may
         not be redrawn) or to provide additional security of a nature and
         value acceptable to the Bank and to our satisfaction in all respects.
         Any such additional security thus provided by you will become part of
         the Security for the purpose of this Offer.

16.      LAW AND JURISDICTION

This Offer and the Security Documents will be governed and construed in
accordance with the Law of England and Wales and will be subject to the
non-exclusive jurisdiction of the Courts in England and Wales to which you
agree to submit.

17.      GENERAL

17.1     In the event of there being any conflict between the terms and
         conditions of this Offer, the Conditions and the Security Documents
         the terms and conditions of the Security Documents will prevail
         overall and the terms and conditions of this Offer will prevail over
         the Conditions.

17.2     We reserve the right to Offer, transfer or grant participations in the
         Facility to other banks or financial institutions without your prior
         approval but your contract is solely with us and it will be our
         responsibility to account to transferees or participants.  You will
         execute (at our expense) any documents required by us to facilitate
         any such transfer or participation and by your acceptance of this
         Offer you authorise us to exchange information with potential
         transferees or participants.

17.3     No failure or delay on our part to exercise any power, right or remedy
         under this Offer or the Security Documents will operate as a waiver
         thereof nor will any single, or any partial, exercise or waiver of any
         such power, right or remedy preclude its further exercise or the
         exercise of any





                                       15
<PAGE>   16
         other power, right or remedy.  The powers, rights and remedies
         provided by this Offer and the Security Documents are cumulative and
         in addition to any powers, rights and remedies provided by law.

17.4     If any applicable law, regulation or requirement in any jurisdiction
         or any change therein or in the interpretation thereof makes it (or
         makes it apparent that it is) unlawful or impossible for you or any
         third party to perform your obligations under this Offer or the
         Security Documents or if it becomes impossible or unlawful for us to
         perform our obligations under this Offer then:

         i)      we will be discharged from all obligations to grant, renew or
                 to continue the Facility; and

         ii)     you will on demand pay to us the Debt; and

         iii)    you will indemnify us on demand against all loss or expense
                 including all legal expenses we may incur or sustain in
                 consequence.

17.5     We shall not be liable for any failure to perform our obligations
         under this Offer resulting directly or indirectly from the action or
         inaction of any governmental or local authority or any strike,
         boycott, blockade, act of God or civil disturbance.

17.6     This Offer and the Security Documents shall be binding upon and enure
         for the benefit of our successors and assigns but you may not assign
         your rights hereunder.

We reserve the right to withdraw this Offer at any time.  Subject thereto, this
Offer will remain open for acceptance by you for a period of one month from the
date in the Schedule and will then lapse.


/s/ [illegible signature]              /s/ [illegible signature]

Signed for and on behalf of
THE BANK OF N.T. BUTTERFIELD & SON LIMITED - LONDON BRANCH





                                       16
<PAGE>   17
IMPORTANT NOTICE

THIS OFFER CREATES LEGAL OBLIGATIONS WHICH WALL BE BINDING UPON YOU AND UPON
WHICH YOU ARE ADVISED TO OBTAIN APPROPRIATE LEGAL ADVICE. IN YOUR ACCEPTANCE OF
THIS OFFER YOU CONFIRM THAT YOU HAVE BEEN ADVISED BY US TO TAKE INDEPENDENT
LEGS ADVICE REGARDING THE CONTENTS OF THIS OFFER AND, WHETHER OR NOT YOU HAVE
FOLLOWED THAT ADVICE, YOU ACCEPT THIS OFFER WITH FULL KNOWLEDGE AND
UNDERSTANDING OF ITS MEANING AND EFFECT.

Offer accepted on the terms and conditions set out above
for and on behalf of
HORIZON EXPLORATION LIMITED



Authorised Signatory      /s/ Neil A.M. Campbell            Date
                          /s/ G.M. Harrison


As Guarantor, we Exploration Holdings Limited acknowledge the terms and
conditions set out in this letter.



for and on behalf of
EXPLORATION HOLDINGS LIMITED



Authorised Signature      /s/ Neil A.M. Campbell            Date
                          /s/ G.M. Harrison


As Guarantor, we Seismic Exploration Limited acknowledge the terms and
conditions set out in this letter.



for and on behalf of
SEISMIC EXPLORATION LIMITED



Authorised Signature      /s/ G.M. Harrison                 Date





                                       17

<PAGE>   1
                                                                         10.33.2

The Directors
Horizon Exploration Limited
6 Pembroke Road
Sevenoaks
Kent TN 13 I XR                                                  23 August 1994


Dear Sirs,

Further to our discussions, the Bank of N T Butterfield and Son Ltd (the Bank)
is prepared to place at the disposal of Horizon Exploration Limited (the
Company) revolving banking facilities (the Facility) subject to the following
terms and conditions contained in this letter (the Facility Letter).

1.     Amount and Purpose

       The sum available under the Facility shall not exceed a gross maximum
       aggregate amount of L.3,500,000 (Three Million Five Hundred Thousand
       Pounds Sterling) outstanding at any one time or subject to availability,
       the equivalent in any other major currency other than Pounds Sterling,
       (the Alternative Currency) to provide the Company with:-

       a)     Within the Facility Amount, a sub-limit of up to L.2,750,000 (Two
              Million Seven Hundred and Fifty Thousand Pounds Sterling) for:

              i)     Subject to clause 2. hereof, the Company to repay its
                     existing indebtedness, (the Indebtedness) to the National
                     Westminster Bank Plc, 67 High Street, Sevenoaks, Kent,
                     TN13 1LA (National Westminster Bank Plc); and

              ii)    Financing on a contract by contract basis, (the Contract
                     Finance) the costs and expenses (including the purchase
                     price of the Goods as hereinafter defined) incurred by the
                     Company in obtaining for the Buyer, (as hereinafter
                     defined) marine seismic data pursuant to the terms and
                     conditions of contracts (the Contracts) entered into
                     between the Company and buyers acceptable to the Bank (the
                     Buyers). Details of the Buyers are listed on Schedule I
                     attached hereto and as amended from time to time. The
                     services available for Contract Finance will be;

                     - sight/deferred payment (maximum 90 days) Irrevocable
                     Documentary Letters of    Credit (ILC's) to secure the
                     purchase of equipment and/or accessories (the Goods) to be
                     installed by the Company on board chartered ships (the
                     Chartered    Ships) used by the Company to carry our
                     marine seismic work; and/or - Short fixed term advances
                     (the Advances); and/or - acceptance credits (Acceptance
                     Credits) for periods of up to 90 days; and/or - the
                     revolving overdraft (the Contractual Overdraft)

                     The duration of the funding provided by the Bank for any
                     of the above is determined by inter-alia the term of the
                     Contract, the cash flow forecasts in
<PAGE>   2
                     respect of each Contract together with the anticipated
                     date of receipt by the Company of the proceeds payable by
                     the Buyer under the terms of the Contract.

       b)     Within the Facility Amount a sub-limit of up to L.500,000 (Five
              Hundred Thousand Pounds Sterling) for;

              i)     Subject to clause 2. hereof, the Company to repay the
                     Indebtedness to National Westminster Bank Plc; and

              ii)    an overdraft (the General Overdraft) for financing the
                     general working capital expenditure of the Company. A
                     cheque book will be provided, for drawings made hereunder.

       c)     Within the Facility Amount a sub-limit of up to L.250,000 (Two
              Hundred and Fifty Thousand Pounds Sterling) for issuing
              contractual bonds and guarantees (the Contractual Guarantees)
              required by the Buyers or potential Buyers in accordance with the
              terms of a Contract.

2.     First Drawdown/Repayment of the Company's Existing Facilities

       a)     The first drawdown under the terms and conditions of this
              Facility Letter will be to repay the Indebtedness to National
              Westminster Bank Plc. Drawdown may only take place once the Bank
              has received an undertaking in writing addressed by National
              Westminster Bank Plc to the Bank to the effect that upon receipt
              by them, on an agreed date and time (the Settlement Date), of an
              amount which will repay in full the Indebtedness then outstanding
              in their books, they will immediately release all security held
              by them. The Bank will have to approve the form of the release
              (the Deed of Release) to be given by National Westminster Bank
              Plc.

       b)     At the same time as National Westminster Bank Plc agree to
              release the security the Directors of the Company will be
              required to swear the appropriate Form 403A "Satisfaction of
              Charges" in order that the charge may be removed from the
              Company's charges register together with any other charges
              outstanding on the register at that time.

       c)     The amount payable to National Westminster Bank Plc in settlement
              of the Company's existing indebtedness (the Settlement Amount)
              will be applied as follows once the Company has provided the Bank
              with the relevant information pursuant to iii) hereof;

              i)     All amounts paid out by the Company in respect of current
                     contracts (the Existing Contracts) prior to the Settlement
                     Date, net of any monies received from the Buyer under the
                     Contract will be debited to the respective Contract
                     Account (as hereinafter defined in Schedule II).

              ii)    The balance of the indebtedness after deducting (i) above
                     will be debited to Account no. 2.





                                       2
<PAGE>   3
       iii)          Once the Bank has been advised by National Westminster 
                     Bank plc as to the Settlement Amount, the Bank will notify
                     the Company of the same and to enable the Bank to apply 
                     the relevant amounts to the Contract Accounts the Company
                     is to provide the Bank with the following;

                     a)     A copy of each Contract together with their
                            respective cash flow forecasts; and

                     b)     The amount drawn under the terms of the facility
                            with National Westminster Bank Plc in respect of
                            each Contract together with details of any payments
                            that have been received from the Buyer which will
                            then provide a net debit balance outstanding in
                            each case; and

                     c)     Details of any invoiced amount which is due from
                            the Buyer to the Company but not yet been received
                            and/or any amounts which have been invoiced by the
                            Company but not yet due for payment from the Buyer
                            and/or the amounts expected from a Buyer once the
                            Contract has been satisfactorily completed; and

                     d)     For the Existing Contracts the Bank will require
                            the following;

                            i)     the consent of the Buyer to the assignment
                                   of the Contract proceeds; and

                            ii)    assignment of the Contract proceeds in a
                                   form acceptable to the Bank; and

                            iii)   Notice of assignment executed by the Company
                                   in a form acceptable to the Bank; and

                            iv)    Acknowledgement from the Buyer of the Notice
                                   of Assignment in a form acceptable to the
                                   Bank.

                     Repayment of the amounts debited to the Contract Accounts
                     (as hereinafter defined in Schedule II) and Account No. 2
                     is to be in accordance with Schedule II, clause MO6.

3.     Modus Operandi

       The Company shall comply with the operational terms and conditions of
       the Facility as issued by the Bank from time to time with the current
       terms and conditions being set out in Schedule II attached hereto, the
       contents of which form part of (and may be used in the interpretation
       of) this Facility Letter.





                                       3
<PAGE>   4
       4.     Fees and Commissions

       The following fees and commissions will be levied by the Bank in respect
       of the services provided under the Facility and will be debited to
       Account No. 2. (as hereinafter defined in Schedule II).

       a)     ILC's (Import)

              i)     Opening Commission: For the first 90 days validity or part
                     thereof the rate will be 0.3125% calculated on the value
                     of the ILC with a minimum charge of L.100.00. Any
                     extension beyond the initial 90 days validity will be
                     charged at a rate of 0.125% per month or part thereof
                     calculated on the undrawn balance of the ILC.

              ii)    Amendments: For each amendment to an ILC a flat fee of
                     L.35.00 will be charged.  If an amendment includes an
                     increase in the value of the ILC and/or an extension to
                     the then current validity, then either the opening
                     commission and/or monthly extension commission rates will
                     be applied.

              iii)   Negotiation/Payment Commission: This will be calculated on
                     the invoice value of the documents negotiated under an ILC
                     at a rate of 0.125% flat with a minimum charge of L.35.00.

              iv)    Acceptance Commission: This will be charged on the
                     unexpired period of the bills/documents accepted by the
                     Bank under a deferred payment ILC at a rate of 1.75% per
                     annum with a minimum charge of L.35.00.

       b)     Contractual Guarantees

              i)     For issuing Contractual Guarantees the Bank will charge
                     1.25% per annum on the value of the Contractual Guarantees
                     with a minimum charge of L.100.00.

       c)     Facility Fee

              The Bank will charge an annual Facility Fee calculated on the
              aggregate of the sub-limits referred to in clause 1 a), b) and
              c), at a rate of 0.375% with the first such fee being payable by
              the Company on acceptance of this Facility Letter.

       d)     Commitment Fee

              On the first Banking Day of each calendar month the Bank will
              charge for the preceding calendar month, a Commitment Fee at a
              rate of 0.075% flat calculated on the aggregate from time to time
              of the unutilised balance of each of the sub-limits referred to
              in clause 1. a) b) and c) of this Facility Letter.

              The charging period will commence thirty days after the date of
              acceptance by the Company of the offer of the Facility and if the
              initial charging period shall start on any





                                       4
<PAGE>   5
              day other than the first day of the calendar month, then the
              first Commitment Fee will be calculated on a pro-rata basis for
              such number of days pertaining thereto.

       e)     Administration Fee

              An Administration Fee calculated at a rate of 0.25% with a
              minimum of L.75.00 will be charged on any drawings made under the
              Facility by way of Acceptance Credits or Advances.

       f)     Additional Fees

              Fees and Commissions for other services available from the Bank
              but not mentioned herein will be levied at the Bank's standard
              tariff, details of which are available on request.

              Any charges incurred directly or indirectly by the Bank on behalf
              of the Company in relation to the Facility and the operation
              thereof including but not limited to telex, facsimile, courier,
              postage and all legal expenses including any legal costs incurred
              in the preparation of this Facility Letter and Security
              Documentation and registration of charge documents will be passed
              to the Company at cost.

              Fees and commissions incurred in an Alterative Currency will be
              converted to Pounds Sterling at an Alterative Currency/Pounds
              Sterling exchange rate exclusively determined by the Bank at the
              time that such charges are calculated.

5.     Interest Rates, Margins and Discount Charges

       a)     In respect of Contract Finance the interest rates and margins to
              be levied by the Bank where applicable thereto will be as
              follows;

              i)     Advances-: the rate will be the aggregate of the rate that
                     the Bank is offered in the interbank market deposits of a
                     similar amount in either Pounds Sterling or an Alternative
                     Currency for periods of one, two, or three months (LIBOR)
                     plus a margin of 2% per annum; and

              ii)    Contractual Overdraft-: the rate will be the aggregate of
                     the rate that the Bank is offered in the interbank market
                     deposits of up to L.50,000 (Fifty Thousand Pounds
                     Sterling) or the Alterative Currency equivalent for one
                     week plus a margin of 2% per annum.

              iii)   Acceptance Credits-: the rate will be the aggregate of
                     LIBOR plus a margin of 1.75% per annum.

              iv)    Discounting ILC Acceptances-: where the Bank is prepared
                     to discount the sum due to a supplier under a deferred
                     payment ILC, the discount charge will be based on a rate
                     which is equal to the rate that the Bank is offered in the
                     interbank market deposits of a similar amount and period
                     to that of the ILC Acceptance





                                       5
<PAGE>   6
                     (as hereinafter defined in Schedule II) in either Pounds
                     Sterling or Alternative Currency plus a margin of 1.50%
                     per annum. 

      Interest accrued under a i) and ii) hereof will be debited to Account
      No. 2 on the last Banking Day of the then current calendar month or the 
      first Banking Day of the succeeding calendar month.

       The interest payable for the relevant period under a iii) and iv) hereof
       will be debited to Account 2 on the Banking day on which the Company
       draws on an Acceptance Credit or requests the discounting of an ILC
       Acceptance.

       b)     On Account No. 2, ( as defined in Schedule II) interest will be
              calculated on the daily debit balance outstanding at a rate
              equivalent to 2.2596 per annum above LIBOR.

       c)     In the event that any amount payable by the Company to the Bank
              under the terms and conditions of the Facility becomes past due,
              then the Company will be charged additional interest on such past
              due amount at a rate of 5% p.a. (five per cent per annum) above
              LIBOR calculated from the date that such amount originally became
              due until receipt by the Bank of cleared funds.

              The Bank's certificate as to the amount of additional interest
              shall be conclusive save for manifest error.

       d)     The calculation of interest or discount charges in Pounds
              Sterling will be based on a 365 day year and in the case of
              Alternative Currencies, on a 360 day year.

              "A Banking Day" shall be a day (excluding Saturdays) when banks
              in London are open for all banking business.

6.     Conditions Precedent

       The Facility will become available to the Company upon receipt by the
       Bank of the following in a form and substance which is acceptable to the
       Bank and its legal advisers:

       a)     The duplicate of this Facility Lender duly signed by authorised
              officers accepting on behalf of the Company the terms and
              conditions of the Facility; and

       b)     A copy, certified as true and accurate by a Director or the
              Company Secretary of a resolution of the Company's Board of
              Directors agreeing to accept the Facility and authorising an
              officer or officers of the Company to sign the enclosed copy of
              this Facility Letter, the Security Documentation, any ancillary
              documentation related thereto and also execute any other notices,
              advices and instructions whatsoever which from time to time may
              be issued or provided under the Facility; and

       c)     A written undertaking addressed to the Bank from National
              Westminster Bank Plc agreeing to release the security held by
              them upon receipt of funds from the Bank the amount of which will
              repay the Indebtedness; and





                                       6
<PAGE>   7
       d)     A Deed of Release in the agreed form in respect of any of the
              security held by National Westminster Bank Plc; and

       e)     A copy of Form 403A signed by the Directors re Satisfaction of
              the Charges held by National Westminster Bank Plc; and

       f)     A copy certified as true and accurate by a Director or the
              Company Secretary of all the current charter agreements entered
              into by the Company for the Chartered Ships; and

       g)     Copies, certified as being true and accurate by a Director or the
              Company Secretary, of the Existing Contracts together with
              documentation referred to in clause 2. c) sub section iii) b) i)
              ii) iii) and iv).

       h)     The Security Documentation pursuant to clause 7 sub paragraphs
              a), b), c), g), h), i) j) and k); and

       For the purpose of this Facility the Bank will rely upon the certified
       copy of the Company's Memorandum and Articles of Association,
       Certificate of Incorporation, Bank Services Agreement, Resolution,
       General Conditions, Signature Mandate and Customer Information Sheet
       currently held by the Bank.

       No utilisation of the Facility may be requested by the Company if an
       Event of Default or Potential Event of Default (as defined in clause 15)
       shall have occurred which has not been expressly waived by the Bank in
       writing or which has not been remedied to the Bank's satisfaction or
       would result from such utilisation.

7.     Security

       As continuing security for all the Company's liabilities to the Bank,
       the Bank will require the following (the Security Documentation):

       a)     The Fixed and Floating Charge in the form of Schedule III
              attached; and

       b)     A Lever of Hypothecation and Pledge in the form of Schedule IV
              attached; and

       c)     Set Off and Charge in the Form of Schedule V attached; and

       d)     A Counter Indemnity in the form of Schedule VI attached to be
              given by the Company to the Bank on each occasion that a
              Contractual Guarantee is to be issued; and

       e)     All title documents including but not limited to Bills of Lading
              (the Title Documents) are to be in a form and substance which can
              convey to the Bank in the first instance, good title to the
              underlying Goods. In order that the Bank may perfect its
              security, the Title Documents, a full set of which are to be
              delivered to the Bank, must clearly state that the Goods are
              consigned "to order" and endorsed by the shipper (or by their
              appointed agent) to the order of "the Bank of N T Butterfield &
              Son Ltd". Alternatively, the Title Documents can show the
              consignee as "The Bank of N T Butterfield & Son Ltd"; and





                                       7
<PAGE>   8
       f)     Where the Company has purchased the Goods and Title Documents are
              provided, the Company will be required to deliver to the Bank
              prior to release of the original documents including the Title
              Documents, a Trust Receipt in the form of Schedule VII attached;
              and

       g)     The guarantee of Exploration Holdings Limited (the Guarantor) in
              the form of Schedule VIII attached together with the appropriate
              resolution of the Guarantor's Board of Directors in a form
              acceptable to the Bank; and

       h)     The guarantee of Seismic Exploration Limited (the IOM Guarantor)
              in the form of Schedule IX attached supported by a Third Party
              Charge in a form acceptable to the Bank over Panamanian
              registered "M/V Caribbean Horizon" together with the appropriate
              resolution of the IOM Guarantors Board of Directors in a form
              acceptable to the Bank; and

       i)     A Legal opinion addressed to the Bank in a form acceptable to the
              Bank confirming the validity and enforceability of the IOM
              Guarantee and Third Party Charge; and.

       j)     The Company is to arrange for Key-Man assurance (the Key-Man
              Assurance Policies) to be issued on terms satisfactory to the
              Bank on the lives of Mr G Harrision, Mr N Campbell and Mr G
              Purdie for not less than L.250,000 (Two Hundred and Fifty
              Thousand Pounds Sterling) each and for a term of at least five
              years and to execute in each case, an assignment in a form
              acceptable to the Bank assigning to the Bank the respective
              Key-Man Assurance Policies; and

       k)     Documentary evidence in respect of insurances referred to in
              clause 9 c) and written notice or acknowledgement addressed by
              the relevant insurance company to the Bank confirming that the
              Bank is noted as 'first lost payee' in respect of any and all
              claims payable under these policies; and

       l)     Prior to requesting a drawdown for each Contract, which shall
              include a clause permitting assignment of the Contract proceeds,
              the company is to deliver to the Bank a copy of the Contract,
              certified as being a true copy by a Director of the Company or
              the Company Secretary together with the cash flow forecasts for
              the Contract plus the following;

              i)     An Assignment in a form acceptable to the Bank of the
                     amounts payable by the Buyer under the Contract; and

              ii)    A Notice of Assignment in a form acceptable to the Bank
                     signed by the Buyer; and

              iii)   An acknowledgement of the Assignment in a form acceptable
                     to the Bank signed by the Buyer; and

       m)     A Letter of Comfort in the form or substantially in the form of
              Schedule X attached; and

       n)     A copy of this Facility Letter signed by the Guarantor and the
              IOM Guarantor.





                                       8
<PAGE>   9
       The Security Documentation referred to in sub clause d), e), f) and l)
       hereof is transactional related and as such will be required from time
       to time with reference thereto included in the Modus Operandi.

8.     Representations. Warranties and Undertakings

       In accepting this Facility Letter the Company represents, warrants and
       undertakes that now and so long as any amount remains to be drawn or
       remains outstanding or any interest, fees, costs, expenses or any other
       liabilities actual or contingent remain due or may become due to the
       Bank hereunder, that:

       a)     The Company is duly incorporated and validly existing under the
              laws of England and has all the necessary powers to enter into
              and comply with the terms and conditions of this Facility Letter
              and furthermore the Company has complied with all material,
              statutory and other requirements (legal or otherwise) relative to
              its business; and

       b)     The Company's total borrowings and liabilities actual or
              contingent, including any sums outstanding hereunder, are within
              its powers under its Memorandum and Articles of Association; and

       c)     All official consents and or approvals required to accept the
              Facility have been obtained and are in full force and effect and
              the Company is not by the acceptance of the Facility,
              contravening any existing applicable law or regulation or any
              contractual or other restriction or limitation binding on the
              Company; and

       d)     There are no actions, suits or proceedings pending against the
              Company nor to the Company's knowledge after due enquiry,
              threatened against the Company or any of its assets or revenues
              which could or might have a material adverse effect on the
              financial condition or otherwise of the Company; and

       e)     The Company will promptly advise and inform the Bank on becoming
              aware of any Event of Default or Potential Event of Default as
              defined in Clause 16; and

       f)     Since the date of the last audited accounts for the Company
              (copies of which have been delivered to the Bank) to the best of
              the Company's knowledge there have been no material or adverse
              changes in the business, assets or financial condition; and

       g)     The Company's obligations hereunder will at all times, during the
              term of the Facility, rank in priority to all existing and/or
              future indebtedness or commitments other than those commitments
              which by law will automatically rank in priority; and

       h)     All the information supplied to the Bank in connection with the
              negotiation and preparation of the terms of the Facility is to
              the best of the Company's knowledge true and correct and not
              misleading and furthermore the Company has disclosed everything
              which the Bank could reasonably expect the Company to consider to
              be material in connection herewith.





                                       9
<PAGE>   10
       The Representations, Warranties and Undertakings will be deemed to be
       repeated by the Company on and as of each drawing under the Facility as
       if made with references to the facts and circumstances existing at such
       respective date.

9.     Covenants

       So long as amounts remain outstanding or remain to be drawn under the
       Facility the Company shall:

       a)     Not create or permit to arise any mortgage, debenture, charge,
              pledge lien or any other encumbrance or security whatsoever over
              any part of the Company's present or future undertaking, assets
              or revenues other than the charge dated 25 August 1993 in a
              favour of Marley Water Proofing Limited without the Bank's prior
              written consent, which shall not be unreasonably withheld; and

       b)     Notify the Bank in writing of any material change in the nature
              of the Company's business as carried on at the date hereof which
              may involve acquisition, disposal or otherwise, of the whole or
              any substantial part of the Company's undertaking, property,
              assets or except for stock in trade; and

       c)     Ensure that insurances on and in relation to the Company's
              business and assets are maintained with reputable underwriters or
              Insurance companies against such risks and to such extent as is
              usual for companies carrying on a business such as that carried
              on by the Company and the Bank's interests noted thereon; and

       d)     Not, without prior written consent from the Bank which shall not
              be unreasonably withheld, make any fundamental changes whatsoever
              to the Company's Memorandum and Articles of Association; and

       e)     Not without the prior written consent from the Bank make or grant
              any loan or give any credit to any person other than normal trade
              credit; and

       f)     Enter into negotiations with the Bank in the event that the
              Bank's legal advisors recommend that the existing security be
              amended and/or that the Bank should seek additional security, to
              secure the Company's liabilities hereunder and provide such
              additional security as may be required; and

       g)     Except under this Facility, borrow or raise any money or incur
              any credit or give any guarantees, indemnities or other
              assurances against financial loss other than lease or hire
              purchase agreements entered into from time to time by the Company
              for the purchase of capital equipment or office premises and/or
              the chartering of Chartered Ships which are to be used the
              Company in carrying out work pursuant to the terms of a Contract;
              and

       h)     Sell transfer lend or otherwise dispose of all or any part of
              your present or future undertaking assets, rights or revenues
              (whether transactions are related or not) without the Bank's
              prior written consent which shall not be unreasonably withheld;
              and





                                       10
<PAGE>   11
       i)     You will permit the Bank or its representatives and/or advisers
              to have full access to the Chartered Ships; and

       j)     Agree to provide the Bank with such additional financial
              information as it may reasonably request in connection with the
              Facility.

10.    Financial Reporting Requirements

       The Company is required to deliver to or obtain for the Bank the
       following financial information;

       a)     On a Monthly basis and within seven Banking Days of the last
              Banking Day in the preceding calendar month;

              i)     Management Accounts plus up to date cash flow forecasts to
                     each Contract where applicable; and

              ii)    Aged debtors and creditors analysis.

       b)     Within twenty one days of the end of each quarterly trading
              period;

              i)     Management prepared profit and loss account and balance
                     sheet; and

       c)     Within thirty days of the end of each six month accounting
              period;

              i)     Projected cash flow forecasts for the next six months
                     trading; and

       d)     Within Ninety days of each financial year end;

              i)     two copies of the Company's Annual Audited Report and
                     Accounts together with a certificate of compliance signed
                     by the Company Secretary or the Company's auditors; and

              ii)    Cash flow forecasts and budgets for the next twelve months
                     trading; and

              iii)   Copies of the Audited Report and Accounts (where
                     applicable) for the Guarantor.

11.    Indemnity

       a)     All costs, charges and expenses (including United Kingdom Value
              Added Tax), incurred by the Bank in respect of the Facility or in
              suing for or recovering any sum due to the Bank hereunder
              including but not limited to, legal costs, shall be for the
              Company's account in each case on a full indemnity basis, and
              payable by the Company on receipt of the Bank's first written
              demand, which shall be conclusive save for manifest error.

       b)     Without limitation to such rights as the Bank may have under the
              Facility and without prejudice to any of the Bank's other rights
              under any indemnities, guarantees or security, the Company hereby
              unconditionally and irrevocably undertakes to indemnify the Bank





                                       11
<PAGE>   12
              against all liabilities, losses, claims, costs and expenses of
              whatever nature (including the cost of any investment currency
              the Bank may be required to buy and any exchange control premiums
              or any penalties or other expenditure) which may result or which
              the Bank may suffer, incur or sustain directly or indirectly
              under or in respect of the Facility inter-alia by reason of the
              failure by the Company to perform any of the obligations
              hereunder, including without limitation any failure to procure
              any other party to fulfill any obligations or satisfy any
              liabilities directly or indirectly under or in connection with
              the Facility.

       c)     This Indemnity shall be irrevocable and shall remain in full
              force and effect until the Company's liabilities actual or
              contingent in connection with the Facility have been discharged
              or otherwise satisfied in full, and shall extend to all
              extensions renewals, increases or replacements of the Facility
              and is in addition to and shall not prejudice or affect any other
              security or right or remedy available to the Bank and shall not
              be prejudiced or affected thereby or by the Bank giving time or
              compounding with or granting indulgence or other relief to any
              other person or party or by the Bank failing to comply with any
              formal or other legal requirements or the exercise of statutory
              or other remedies relating to the same or any other matter or
              thing which but for this provision might exonerate the Company.

12.    Payments and Taxes

       Any payments due to the Bank hereunder are to be made without
       counter-claim and clear of and without deduction for, or on account of,
       any present or future taxes, levies, imposts, duties, deductions,
       withholdings or other charges of whatsoever nature imposed or levied in
       or on behalf of any authorities (governmental or otherwise). In the
       event that a payment is reduced the Bank will require a payment from the
       Company covering such reduction which will then enable the Bank to
       receive an amount equal to the full amount which the Bank would have
       received had no such deduction been made.

       No payment to the Bank under this Facility Letter pursuant to any
       judgement or order of any court or otherwise shall operate to discharge
       the obligations of the Company in respect of which it was made unless
       and until payment shall have been received in Pounds Sterling or an
       Alternative Currency: and to the extent that the amount of any such
       payment shall on actual conversion into Pounds Sterling or an
       Alternative Currency, the Bank shall have a further and separate course
       of action against the Company for the recovery of such sum as shall
       after conversion into Pounds Sterling or Alternative Currency be equal
       to the amount of the shortfall.

13.    Reserve Requirement

       In the event of change in existing laws, regulations or directives to
       which the Bank may be subjected or in the interpretation or application
       thereof, or the introduction of any new law, regulation or directive to
       which the Bank may be subjected, which has the effect of reducing the
       return to the Bank in performing any of the services hereunder, the Bank
       reserves the right to alter the basis on which interest, fees and
       commissions are charged under the Facility so as to compensate for such
       reduced return. The Bank will wherever possible notify the Company in
       writing prior to any changes being implemented.





                                       12
<PAGE>   13
14.    The Bank's Right of Set-Off and Consolidation

       It is hereby agreed and declared that in addition to any right of
       set-off or other similar right to which the Bank may be entitled by law,
       the Bank may at any time and without notice to the Company combine and
       consolidate all or any accounts between the Company and the Bank and/or
       set-off any moneys whatsoever and whether on current account or deposit
       account and whether in Pounds Sterling or in an Alternative Currency
       which the Bank may at any time hold for the account of the Company
       against any liabilities whatsoever whether such liabilities are actual
       or contingent and whether owed as principal or surety.

15.    Events of Default

       Notwithstanding anything herein contained and without limitation to the
       Bank's rights hereunder the Bank shall on the occurrence of any of the
       following events of default be entitled to terminate the Facility and
       demand from the Company either, immediate repayment of or full cash
       cover for all the Company's liabilities then outstanding (actual or
       contingent) hereunder. At the same time the Bank will require a payment
       from the Company for any losses and expenses (including loss of profit)
       incurred or suffered by the Bank in consequence of an Event of Default.
       The Bank's certificate as to the amount of such losses and expenses
       shall be conclusive save for manifest error.

       a)     Each of the following shall be an Event of Default namely:

              i)     If the Company defaults in the payment of any monies which
                     may become due to the Bank or there shall be any breach by
                     the Company of the terms and conditions of the Facility or
                     any other facility letter, guarantee, security agreement,
                     document or other obligation which the Company may, from
                     time to time have with the Bank, its associates or
                     subsidiaries; or

              ii)    If any representation warranty undertaking or covenant
                     from time to time made or deemed to have been made by the
                     Company to the Bank, its associates or subsidiaries is
                     incorrect or misleading or if any of the terms and
                     conditions of the Facility or any other obligation or
                     liability of the Company to the Bank, its associates or
                     subsidiaries is not fulfilled; or,

              iii)   If the Company or the Guarantor or the IOM Guarantor
                     defaults or receives notice of default under any trust,
                     deed, debenture, loan agreement, guarantee (which
                     expression shall include all contingent liabilities
                     undertaken in respect of the obligations or liabilities of
                     any third party including all guarantees, indemnities,
                     bonds or instruments of suretyship whether constituting
                     primary or secondary obligations or liabilities whatsoever
                     their designation) or if money payable thereunder becomes
                     due and is not paid on or before the due date or if any
                     surety created by the Company becomes enforceable; or

              iv)    If a petition is presented or any order made or a
                     resolution passed for the winding up of the Company, or if
                     the Company is dissolved or a notice is issued concerning
                     a meeting for the purpose of passing any such resolution
                     or a





                                       13
<PAGE>   14
                     resolution to reduce or redeem all or any part of the
                     Company's issued share capital or of considering whether
                     any and if so what measures should be taken to deal with
                     the situation referred to in Section 142 of the Companies
                     Act 1985 (or any mandatory or statutory re-enactment
                     thereof) or if the Company ceases or threatens to cease to
                     carry on its business or any substantial part thereof in
                     the normal course, save in any such case for the purpose
                     of and followed within six months by an amalgamation or
                     reconstruction not involving or arising out of insolvency
                     on terms previously approved by the Bank in writing; or

              v)     If any encumbrance shall take possession or a receiver,
                     trustee, administrative receiver, administrator or similar
                     officer shall be appointed to the whole or any part of the
                     Company's undertaking, property or assets or if any
                     judgement or order made against the Company is not
                     complied with within seven days or if any execution,
                     distress, or other process be levied or enforced upon or
                     sued out against any of the Company's property, assets or
                     revenues; or

              vi)    If the Company becomes or is deemed to be unable to pay
                     debts as and when they fall due whether within the meaning
                     of Section 518 of the Companies Act 1985 (or any mandatory
                     or statutory re-enactment thereof) or otherwise or if a
                     notice is issued convening a meeting of or the Company
                     proposes to enter into any composition or arrangement with
                     its creditors or agrees or declares a moratorium in
                     respect of any of its debts or stops payment or if notice
                     is given to the nominee referred to in Part I of the
                     Insolvency Act 1986 (or mandatory or statutory
                     re-enactment thereof) of an intended proposal for any such
                     voluntary arrangement in that part of the Act or if a
                     substantial part of the Company's business property assets
                     or capital is nationalised, seized or appropriated; or

              vii)   If there is at any time a change in the voting control of
                     the Company which the Bank considers material or if
                     without the Bank's prior written consent control of the
                     Company should pass to any person or group of persons (as
                     defined in Section 839 of the Income and Corporation Taxes
                     Act 1988) (or any mandatory or statutory re-enactment
                     thereof) or institution or group of institutions not
                     having control at the date hereof; or

              viii)  If any material provision of this Facility Letter or any
                     security given in respect thereof ceases in any respect to
                     be in full force and effect or to be continuing or is
                     purported to be determined or becomes in jeopardy or is
                     invalid or unenforceable; or

              ix)    If any suspension of payments is filed by the Company
                     under any applicable bankruptcy law or similar statute; or

              x)     If any waiver of consent, (governmental or otherwise),
                     required for the validity enforceability or performance of
                     the Facility is for any reason is not provided or is
                     withdrawn or ceases to be in full force and effect; or





                                       14
<PAGE>   15
              xi)    If the Bank considers that the Company's financial
                     position is deteriorating or has deteriorated so as to
                     place in jeopardy the repayment of any amounts which will
                     become due or outstanding hereunder.

       b)     The Company will immediately notify the Bank in writing of the
              occurrence of any Event of Default (with the exception of Clause
              15 a) xi. above). No failure or delay on the Bank's part in
              exercising any right hereunder shall operate as a waiver thereof
              nor shall any single or partial exercise of any such right
              preclude its further exercise.

       c)     Any of the events described in clause 15 a) above which occur in
              relation to the Guarantor or the IOM Guarantor or to any present
              or future holding company, and/or subsidiaries as defined in
              Section 736 of the Companies Act 1985 (or any mandatory or
              statutory re-enactment thereof) which has a material and/or
              adverse effect (financial or otherwise) will also be deemed to be
              an Event of Default.

       d)     For the purpose of this Facility Letter, Potential Event of
              Default shall mean any event which with the giving of notice
              and/or lapse of time and/or making any determination by the Bank
              would constitute an Event of Default.

16.    Notices

       All notices, requests, demands or other communications to or upon the
       respective parties to the Facility shall be in writing delivered
       personally or by first class prepaid letter, telex or telefax and shall
       be deemed to have been duly given or made when delivered personally or
       by letter (or by telex or telefax) to the other party at its address set
       out above or at such other address as the party concerned may hereafter
       specify to the other in writing (or in the case of telex or telefax to
       the published number of the addressee). Posted letters shall be deemed
       to have been delivered twenty-four hours after posting (Saturdays,
       Sundays and Public Holidays excepted) and telexes and telefaxes shall be
       deemed to have been despatched during business hours and if they are not
       so despatched, at the opening of business on the next following Banking
       Day.

17.    General

       a)     In this Facility Letter words importing the singular include the
              plural and vice versa.

       b)     Nothing contained in this Facility Letter shall restrict the
              operation of any general lien, right of set-off or any other
              rights or remedies whatsoever which the Bank may have whether by
              law or otherwise.

       c)     In the event that any provisions under this Facility Letter or
              the Security Documentation should be or become ineffective in
              whole or in part, the remaining provisions shall not be affected
              in any way.

       d)     No failure to exercise and no delay in exercising by the Bank of
              any right, power or privilege under this Facility Letter shall
              operate as a waiver thereof nor shall any single or partial
              exercise of any such right preclude in further exercise. The
              rights and remedies





                                       15
<PAGE>   16
              herein provided are cumulative and not exclusive of any rights or
              remedies provided by law.

       e)     The headings to clauses are for convenience only and have no
              legal effect.

18.    Expiry/Review Date of the Facility

       a)     It is to be understood that whilst the Bank reserves the right to
              terminate the Facility where an Event of Default or Potential
              Event of Default occurs pursuant to Clause 15 hereof, it is the
              Bank's present intention that the Facility will remain available
              to the Company until 31st July 1995 (the Expiry Date).

       b)     In the event that the Company does not receive from the Bank, at
              least one month prior to the Expiry Date, written notice
              confirming inter-alia that the Facility has been extended for a
              further period then the Facility shall be deemed to have been
              cancelled.  The then current obligations and liabilities
              outstanding at the Expiry Date will unless the Company is in
              default pursuant to clause 15 hereof, be repayable in accordance
              with the terms and conditions of the Facility. After such date no
              new ILC applications will be processed and/or new drawings
              permitted.

       c)     The Bank's certificate as to the amount due pursuant to b) hereof
              and repayment dates thereof will be sent to the Company and shall
              be conclusive save for manifest error.

19.    Assignment

       The Bank shall be entitled to assign and/or transfer all or part of its
       interest in the Facility and Security Documentation to any one or more
       banks or financial institutions at any time at the Bank's sole
       discretion and thereafter reference to the Bank throughout the Facility
       shall be deemed to include such assignees.

       The Company cannot assign its rights and obligations under the Facility
       without the Bank's prior written consent.

20.    Applicable Law

       This Facility Letter shall be deemed to be made under and shall be
       construed in accordance with and governed in all respects by English law
       with jurisdiction in the courts of England and Wales but the Facility
       may be enforced in any court of competent jurisdiction selected by the
       Bank.

21.    Acceptance

       The offer of the Facility will remain open for a period of one month
       from the date hereof and the Bank duly requests the Company to confirm
       its acceptance in accordance with Clause 7. Conditions Precedent. In the
       event that the Company's acceptance is not received by the Bank within
       the time specified, then the offer will lapse.





                                       16
<PAGE>   17
The Bank is pleased to have arranged the Facility and trusts it will operate to
our mutual satisfaction.


Yours faithfully,
for and on behalf of
Bank of N T Butterfield & Son Ltd

/s/ [illegible signatures]                      /s/ [illegible signatures]


Authorised Signature                                        Authorised Signature





                                       17
<PAGE>   18
IMPORTANT NOTICE

This offer creates legal obligations which will be binding upon the Company and
the Company is advised to obtain appropriate legal advice. By the Company's
acceptance of this offer the Company confirms that it has been advised by the
Bank to take independent legal advice regarding the contents of this offer and,
whether or not the Company has followed this advice, the Company accepts this
offer with full knowledge and understanding of its meaning and effect.

                                ----------------



We, Horizon Exploration Limited, hereby accept and agree to abide by the terms
and conditions of the Facility as detailed herein.



                     /s/ G.M. Harrison
for and on behalf of /s/ Neil A.M. Campbell
HORIZON EXPLORATION LIMITED                                 DATE:

(Signed pursuant to the Board Resolution dated 30th August 1994 a certified
copy of which is attached hereto.)


As Guarantor, we Exploration Holdings Limited hereby acknowledge the terms and
conditions of the Facility contained herein.



                     /s/ G.M. Harrison
for and on behalf of        /s/ Neil A.M. Campbell
EXPLORATION MOLDINGS LIMITED                                DATE:




As Guarantor, we Seismic Exploration Limited hereby acknowledge the terms and
conditions of the Facility contained herein.



for and on behalf of /s/ G.M. Harrison
SEISMIC EXPLORATION LIMITED                                 DATE:





                                       18

<PAGE>   1

                                                                         10.33.3




The Directors
Horizon Exploration Limited
6 Pembroke Road
Sevenoaks
Kent
TN13 1XR

Dear Sirs:

We refer to the Facility Letter dated 23 August 1994 between Horizon
Exploration Limited (the Company) and the Bank of NT Butterfield & Son Limited
(the Bank).

The Bank is pleased to confirm that the Facility is amended as follows and
except as otherwise specified in this letter (Amendment Letter No. 1), the
terms and expressions defined in the Facility Letter shall have the same
meaning and effect where used herein.

The amendments to the Facility are;

1.       Clause 1 - Amount and Purpose - the opening paragraph is now to read:

         "The maximum sum to be drawn under the Facility shall not exceed in
         aggregate L.4,300,000 (Four Million Three Hundred Thousand Pounds
         Sterling) (the Facility Amount) or subject to availability the
         equivalent in any other major currency other than Pounds Sterling (the
         Alternative Currency). The Facility Amount will remain available to
         the Company until the 31 July 1995 after which date the amount
         available for drawing will be reduced to L.3,400,000 (Three Million
         Four Hundred Thousand Pounds Sterling).

2.       Clause 1 - Amount and Purpose - paragraph a) is now to read:

         a) "Within the Facility Amount a sub-limit of up to L.3,900,000 (Three
         Million, Nine Hundred Thousand Pounds Sterling) which will remain
         available until the 31 July 1995 after which date the sub-limit will
         be reduced to L.3,000,000 (Three Million Pounds Sterling)".

         Clause 1 - a) i) and ii) remain unchanged.

3.       Clause 1 - Amount and Purpose - paragraph b) the sub-limit referred to
         is now to read:

         "L.350,000 (Three Hundred and fifty Thousand Pounds Sterling)"
<PAGE>   2
4.       Clause 1 - Amount and Purpose - paragraph c) is now to read:

         c) "Within the Facility Amount a sub-limit of up to L.50,000 (Fifty
         Thousand Pounds Sterling) for the issuance of a guarantee in the
         standard form in favour of HM Customs and Excise (the Duty Deferment
         Guarantee) providing up to L.25,000 (Twenty Five Thousand Pounds
         Sterling) per month for deferred payment terms on liabilities incurred
         by the Company in respect of excise duties, levies, imposts and value
         added tax due to HM Customs and Excise".

5.       Clause 2 - Modus Operandi

         A revised Modus Operandi in the form of Schedule II dated February
         1995 is attached.

6.       Clause 4 - Fees and Commissions - paragraph b) is now to read:

         b) "Duty Deferment Guarantee

         i) The fee for the Duty Deferment Guarantee will be 1.25% per annum on
         the total liability thereunder (i.e. up to a maximum of L.50,000) with
         a minimum charge of L.250.00".

7.       Clause 6 - Security - the opening paragraph is now to read:

         "As continuing security for an the Company's liabilities to the Bank
         including those under the Term Loan Facility Letter dated 27 February
         1995 between the Bank and the Company (the Term Loan Facility), the
         Bank will require and/or continue to rely upon the following (the
         Security Documentation)"

8.       Clause 6 - Security - paragraph d) is now to read:

         "d) A Counter Indemnity in the form of Schedule VI attached is to be
         given by the Company to the Bank in respect of the Duty Deferment
         Guarantee".

9.       Clause 6 - Security - the final paragraph is now to read:

         "The Security documentation referred to in sub-paragraphs e), f) and
         l) hereof is transactional related and as such will be required from
         time to time with reference thereto included in the Modus Operandi.
         The Security provided by the Company to the Bank under the Term Loan
         Agreement will also constitute security for the Facility provided
         hereunder, which for the avoidance of doubt will include:

         i)      A Chattel Mortgage in a form acceptable to the Bank over
                 assets to be financed by the Bank under the Term Loan
                 Facility; and





                                       2
<PAGE>   3
         ii)     A Deed of Subordination in a form acceptable to the bank in
                 respect of the Majority Shareholders Loan.

10.      Clause 8 - Representations, Warranties and Undertakings - paragraph g)
         is now to read:

         g) "The Company's obligations hereunder will at all times during the
         term of this Facility and the Term Loan Facility, rank in priority to
         an existing and/or future indebtedness or commitments other than those
         commitments which by law win automatically rank in priority; and"

11.      Clause 9 - Covenants - the following paragraphs are to be added:

         k)      Not make any payments of dividends to the shareholders for so
                 long as the Company has any liability outstanding to the bank
                 under this Facility or the Term Loan Facility; and

         l)      The Company is to comply with the following financial
                 covenants which will be tested against the Company's audited
                 financial statements for the year ending 31 December 1995.

                  i) Gearing                       : Not greater than 0.80:1
                  ii) Leverage                     : Not greater than 2:1
                 iii) Interest Cover               : Not less than 3.75 x
                  iv) Net Worth                    : Not less than L.3,600,000

Note the following definitions apply in respect of the financial covenants.

"Gearing" means the Company's interest bearing debt net of cash balances held
to Net Worth.

"Leverage" means all balance sheet liabilities to Net worth.

"Interest Cover" means operating profits before interest payable.

"Net Worth" means paid-up share capital, the retained earnings plus the
Majority Shareholders Loan less intangible assets and non-quoted investments.

"Majority Shareholders Loan" means the loan granted to the Company by Energy
Research International Limited c/o Caledonian Bank and Trust Limited, PO Box
1045, Georgetown, Grand Cayman, Cayman Islands. (The Majority Shareholder) in
the sum of USD 2,000,000 (Two Million United States Dollars) which for the
avoidance of doubt is subordinated to this Facility and the Term Loan Facility.

12.      Clause 9 - Covenants - paragraph c) is now to read:





                                       3
<PAGE>   4
         c) "Ensure that insurances on and in relation to Company's business
         and assets (including the assets referred to in the Term Loan Facility
         are maintained with reputable underwriters or insurance companies
         against such risks and to such extent as is usual for companies
         carrying on a business such as that carried on by the Company and the
         Bank's interests are to be noted thereon as `first loss payee'; and"

13.      Clause 9 - Covenants - paragraph g) is now to read:

         "Except under this Facility, the Term Loan Facility and the Majority
         Shareholders Loan and not without the prior written notice to the
         Bank, borrow or raise any money or incur any credit or give any
         guarantees, indemnities or other assurances against financial loss
         other than lease or hire purchase agreements entered into from time to
         time by the Company for the purchase of capital equipment or the
         office premises or the chartering of Chartered Ships which are to be
         used by the Company to carry out work pursuant to the terms of a
         Contract; and"

14.      Clause 15 - Events of Default - paragraph a) i) to now read:

         i) "If the Company defaults in the payment of any monies which may
         become due to the Bank or there shall be any breach by the Company or
         any other party of the terms and conditions of the Facility, the Term
         Loan Facility, the Deed of Subordination or any other facility letter,
         guarantee, security agreement, document or other obligation which the
         Company may, from time to time have with the Bank, its associates or
         subsidiaries; and"

15.      Clause 15 - Events of Default - paragraph a) viii) to now read:

         viii) "If any material provision of this Facility and/or the Term Loan
         Facility and/or the Deed of Subordination and/or any security given in
         respect thereof ceases in any respect to be in full force and effect
         or to be continuing or is purported to be determined or becomes in
         jeopardy or is invalid or unenforceable; or"

All other terms and conditions remain unchanged.

The amendments contained in Amendment No. 1 will become effective upon receipt
by the Bank of the following:

         i)      The duplicate copy of this letter signed by authorized offices
                 of the Company accepting and agreeing to abide by the amended
                 terms of the Facility; and

         ii)     The duplicate copy of this letter countersigned by the
                 Guarantor and the IOM Guarantor acknowledging the amendments
                 to the Facility; and

          iii)   The Company's acceptance of the Term Loan Facility.





                                       4
<PAGE>   5
The Bank is pleased to have arranged the amendments and trusts that the
Facility will continue to operate to our mutual satisfaction.

Yours faithfully
for and on behalf of
The Bank of NT Butterfield and Son Limited

/s/ [illegible signature]                     /s/ [illegible signature]

Authorized Signature                          Authorized Signature


IMPORTANT NOTICE 

This amendment creates legal obligations which will be binding upon the Company
and the Company is advised to obtain appropriate legal advice. By the Company's
acceptance of this amendment the Company confirms that it has been advised by
the Bank to take independent legal advice regarding the contents of this
amendment and whether or not the Company has followed this advice, the Company
accepts this amendmement with full knowledge and understanding of its meaning
and effect.

We, Horizon Exploration Limited hereby accept and agree to abide by the amended
terms and conditions contained in this letter, Amendment No. 1.

for and on behalf of
Horizon Exploration Limited

/s/ Neil A.M. Campbell
/s/ G.M. Harrison

Authorized Signature(s)                    Date:



As IOM Guarantor, we, Seismic Exploration Limited, acknowledge the amendments
to the terms and conditions of the Facility, contained in Amendment No. 1.

for and on behalf of

Seismic Exploration Limited

/s/ G.M. Harrison
/s/ George Purdie





                                       5
<PAGE>   6
Authorized Signature(s)                            Date:

As Guarantor, we, Exploration Holdings Limited, acknowledge the amendments to
the terms and conditions of the Facility.

for and on behalf of
Exploration Holdings Limited

/s/ Neil A.M. Campbell
/s/ G.M. Harrison

Authorized Signature(s)                            Date:





                                       6

<PAGE>   1
                                                                         10.33.4
19 February 1996


The Directors
Horizon Exploration Limited
6 Pembroke Road
Sevenoaks
Kent
TNI IXR

Dear Sirs,

We refer to the Facility Letter dated the 23rd August 1994 and Amendment Letter
No. 1 between Horizon Exploration Limited (the Company) and the Bank of N.T.
Butterfield and Son Limited (the Bank).

The Bank is pleased to confirm that the Facility is amended as follows and
except as otherwise specified in this letter, the terms and expressions defined
in the Facility Letter and Amendment No. 1 shall have the same meaning and
effect where used herein.

The amendments to the Facility are:

1.       Clause 1 Amount and Purpose - the opening paragraph is now to read:

         The maximum sum to be drawn under the Facility shall not exceed
         L.4,560,000 (Four Million Five Hundred and Sixty Thousand Pounds
         Sterling) (the Facility Amount) or subject to availability the
         equivalent in any other major currency other than Pounds Sterling (The
         Alternative Currency) to provide the Company with:"

2.       Clause 1. Amount and Purpose, paragraph a). The sub-limit referred to
         herein is now to read:

         "L.4,160,000 (Four Million One Hundred and Sixty Thousand Pounds
         Sterling)".

3.       Clause 18 Expiry/Review Date of the Facility. The Expiry Date is now
         to read:

         "31st March 1996".

All other terms and conditions remain unchanged.

Kindly acknowledge receipt and acceptance by signing and returning to the Bank
with fourteen days of the date hereof, the duplicate copy of this letter
(Amendment No. 2) which must also be countersigned by the Guarantor and the IOM
Guarantor.
<PAGE>   2
Yours faithfully
for and on behalf of
The Bank of N.T. Butterfield & Son Limited

/s/ [illegible signature]                         /s/ [illegible signature]

                       ------------------------------

Authorized Signature                              Authorized Signature



We, Horizon Exploration Limited hereby acknowledge receipt and acceptance of
the amended terms and conditions contained in this letter.


for and on behalf of
Horizon Exploration Limited

                          /s/ Neil A.M. Campbell
                          /s/ G.M. Harrison
Authorized Signature(s)                                    Date:  1st March 1996

As Guarantor, we Exploration Holdings Limited hereby acknowledge the amended
terms and conditions of the Facility and confirm that our guarantee shall not
be affected in any way by the amendments made to the Facility and detailed in
this letter.

for and on behalf of
Horizon Holdings Limited

                          /s/ G.M. Harrison
                          /s/ Neil A.M. Campbell
Authorized Signature(s)                                    Date:  1st March 1996


As IOM Guarantor, we Seismic Exploration Limited hereby acknowledge the amended
terms and conditions of the Facility and confirm that our guarantee shall not
be affected in any way by the amendments made to the Facility and detailed in
this letter.

for and on behalf of
Seismic Exploration Limited

                          /s/ G.M. Harrison
                          /s/ Neil A.M. Campbell
Authorized Signature(s)                                    Date:  1st March 1996





                                      2

<PAGE>   1
                                                                         10.33.5

10 May 1996



The Directors
Horizon Exploration Limited
6 Pembroke Road
Sevenoaks
Kent
TNI IXR

Dear Sirs,

We refer to the Facility Letter dated the 24th August 1994 and the Amendment
Letters No. 1 and No. 2 dated the 3rd February 1995 and 19th February 1996
respectively (together the Amendment Letters) between Horizon Exploration
Limited (the Company) and the Bank of N.T. Butterfield & Son Limited (the
Bank).

The Bank is pleased to confirm that the Facility is amended as follows and
except as otherwise specified in this letter, the terms and expressions defined
in the Facility Letter and Amendment Letters shall have the same meaning and
effect where used herein.

The amendments to the Facility are:

1.       Clause 1. Amount and Purpose - the opening paragraph is now to read.

         "The maximum aggregate sum to be drawn under the facility shall be
         temporarily increased by L.840,000 (Eight Hundred and Forty Thousand
         Pounds Sterling) (the Temporary Increase) to a new limit which is not
         to exceed L.5,400,000 (Five Million Four Hundred Thousand Pounds
         Sterling) (the Facility Amount) or subject to availability the
         equivalent in any other major currency other than Pounds Sterling (the
         Alternative Currency)."

         Subject to the Company continuing to comply with the terms and
         conditions of the Facility and providing that an Event of Default or
         Potential Event of Default (as defined in clause 15. d) shall not have
         occurred which has not been expressly waived by the Bank in writing or
         which has not been remedied to the Bank's satisfaction or would result
         from such utilization, the Facility Amount will remain available to
         the Company until the 30th September 1996 after which date the
         Facility Amount will be reduced by L.840,000 (Eight Hundred and Forty
         Thousand Pounds Sterling) to L.4,560,000 (Four Million Five Hundred
         and Sixty Thousand Pounds Sterling).
<PAGE>   2
2.       Clause 2. Amount and Purpose paragraph a) is now to read.

         "Within the Facility Amount, a sub-limit of up to L.5,000,000 (Five
         Million Pounds Sterling) which will remain available to the Company
         until 30th September 1996 after which date this sub-limit will be
         reduced to L.4,160,000 (Four Million One Hundred and Sixty Thousand
         Pounds Sterling)."

3.       Clause 4. Fees and Commissions paragraph c) Facility Fee is now to
         read:

         i)      The Bank will charge an annual Facility Fee calculated on the
                 aggregate of the sub-limits referred to in clause 1 a), b) and
                 c) at a rate of 0.75% per annum.

         ii)     Where a Temporary Increase is made available to the Company,
                 the Bank will charge a flat fee of 0.5% calculated on the
                 amount of such Temporary Increase.

4.       Clause 9 Covenants, paragraph 1) is now to read.

         a)      The Company is to comply with the following financial
                 covenants which will be measured against the Company's audited
                 Report and Accounts for the year ending 31st December 1996.

                 i)       Gearing: Not greater than 0.75:1
                 ii)      Leverage: Not more than 1.75:1
                 iii)     Interest Cover: Not less than 3.25 times the sum paid
                 iv)      Net Worth: Not less than L.5,500,000 (Five Minion
                          Five Hundred Thousand Pounds Sterling)

         b)      The following definitions shall apply in respect of the
                 Financial Covenants.

                 "Gearing"                 means an interest bearing debt net
                                           of cash balances to Net Worth.

                 "Leverage"                means the aggregate total of the
                                           balance sheet liabilities to Net 
                                           Worth.

                 "Interest Cover"          means the total of the operating
                                           profits before interest and tax.

                 "Net Worth"               means the paid up share capital plus
                                           retained earnings and the
                                           Subordinated Loan, less intangible
                                           assets and all quoted and non quoted
                                           investments.

                 "Subordinated Loan"       means the loan granted to the
                                           Company by Energy Research
                                           International Limited, c/o
                                           Caledonian Bank and Trust





                                       2
<PAGE>   3
                                           Limited, P.O. Box 1045, Georgetown,
                                           Grand Cayman, Cayman Islands
                                           (E.R.I.L.) in the sum of USD
                                           2,000,000 and is shown as part
                                           equity and part loan in the Balance
                                           Sheet. For the avoidance of doubt
                                           the Subordinated Loan is
                                           subordinated to this Facility and
                                           the Term Loan Facility as per the
                                           Deed of Subordination between the
                                           Bank and E.R.I.L. dated 21st March
                                           1995."

5.       Clause 18, Expiry/Review Date of the Facility

         The Expiry Date is now to read "31st March 1997"

All other terms and conditions remain unchanged.

The amendments contained in this letter (Amendment No. 3) will become effective
upon receipt by the Bank of the following:

i)       The duplicate copy of this letter signed by authorized officers of the
Company; and

ii)      A Copy certified as true and accurate by a Director or the Company
         Secretary of a resolution of the Company's Board of Directors agreeing
         to accept the amended terms and conditions of the Facility; and

iii)     The duplicate copy of this letter countersigned by the Guarantor and
         the IOM Guarantor acknowledging the amendments to the Facility.

The Bank is pleased to have arranged the amendments and trusts that the
Facility will continue to operate to our mutual satisfaction.

Yours faithfully
for and on behalf of
The Bank of NT Butterfield & Son Limited

/s/ [illegible signature]                          /s/ [illegible signature]

Authorized signature                               Authorized Signature 
                      /s/ G.M. Harrison





                                       3
<PAGE>   4
We, Horizon Exploration Limited hereby confirm our acceptance of the
amended terms and conditions to the Facility.

For and on behalf of
Horizon Exploration Limited



Authorized Signature(s)                            Date:

Signed pursuant to the Board Resolution dated 20 May, 1996, a copy of which is
attached hereto.

                                  /s/ G.M. Harrison
                                  /s/ Neil A.M. Campbell

As IOM Guarantor, we Seismic Horizon Limited acknowledge the amendments to the
terms and conditions of the Facility Letter and confirm that our Guarantee
shall not be affected in any way by the amendments made to the Facility Letter.

For and on behalf of
Seismic Horizon Limited

                          /s/ George Purdie
                          /s/ G.M. Harrison

Authorized Signature(s)                            Date:

As Guarantor, we Exploration Holdings Limited acknowledge the amendments to the
terms and conditions of the Facility Letter and confirm that our Guarantee
shall not be effected in any way by the amendments made to the Facility Letter.

For and on behalf of
Exploration Holdings Limited



Authorized Signature(s)                            Date:

                          /s/ G.M. Harrison
                          /s/ George Purdie





                                       4

<PAGE>   1
                                                                 EXHIBIT 10.33.6

The Directors,                                                     19th May 1997
Horizon Exploration Limited
6 Pembroke Road, 
Sevenoaks, Kent, 
TN13 1XR


Dear Sirs,

RE:STG 4,460.000 ON DEMAND CREDIT FACILITY AND USD TERM LOAN (CURRENT BALANCE
OUTSTANDING USD 400,000) (TOGETHER 'FACILITIES') MADE AVAILABLE BY THE BANK OF
N.T. BUTTERFIELD & SONS LIMITED (THE 'BANK') TO HORIZON EXPLORATION LIMITED
('THE COMPANY')

You have advised the Bank that the Company is in violation of the financial
covenants relating to the Company's gearing (interest bearing debt/net worth),
leverage (total liabilities/net worth), interest cover ratio and net worth
requirements the details of which are set forth in the documentation relating
to the above Facilities.

Subject to the Company agreeing to fully comply with the remaining terms,
conditions and provisions of the Facilities (confirmation of which will be
evidenced by the Company signing and returning to the Bank the duplicate copy
of this letter within seven days of the date hereof) the Bank hereby waives the
default arising from the Company's failure to satisfy the financial covenant
requirements for a period which shall terminate on the either of, the
floatation of the Company, written notification from the Company to the Bank
that the floatation has been postponed and/or cancelled or the 30th September
1997.

Notwithstanding the foregoing the Company is reminded that the Facilities
remain repayable on demand and the waiver contained herein shall not prejudice
the Banks right to demand repayment of the Facilities at anytime.


Yours Faithfully,
for and on behalf of
The Bank of N.T. Butterfield & Sons Limited

/s/ [illegible signature]                              /s/ [illegible signature]

Authorized Signature                                       Authorised Signature
<PAGE>   2
As a condition of the waiver given by the Bank to the Company, we Horizon
Exploration Limited hereby agree to comply with the remaining terms, conditions
and provisions of the Facilities.


for and on behalf of
Horizon Exploration Limited

/s/ Neil A.M. Campbell

Authorised Signature(s)                                     Date:  23 May 1997

<PAGE>   1

                                                                 EXHIBIT 10.34.2



Tidewater Marine
February 12, 1996

Horizon Seismic Inc.
11200 Westheimer St., Suite 410
Houston, TX  77042

Attention:       Mr. David Burns
                          Vice President

RE: Time Charter of M/V ABSHIRE TIDE, Official Number 663944

Gentlemen:

         Pursuant to the terms and conditions of that certain Blanket Time
Charter dated February 9, 1996, entered into by and between Tidewater Marine,
Inc. ("OWNER") and Horizon Seismic Inc. ("CHARTERER'), this letter sets forth
our understanding and agreement that the above captioned vessel ("the Vessel"),
has been chartered by Owner to Charterer subject to the following:

1.       Date of delivery: Delivery is to be on or about March 2, 1996.

2.       Location of delivery: Quality Shipyards, Inc., Houma, Louisiana.

3.       Location of redelivery: Quality Shipyards, Inc., Houma, Louisiana.

4.       Area of Operations/Navigation Limits: Gulf of Mexico.

5.       Minimum term of Charter: Six (6) months.  Thereafter, unless cancelled
         or extended for a specific term, the term hereof shall continue on an
         indefinite basis.

6.       Termination: After the aforesaid minimum term, unless this Short Form
         Charter Agreement be extended for a specific term, OWNER may terminate
         this Agreement at any time and for any reason by giving CHARTERER not
         less than sixty (60) days' written notice of termination; and
         CHARTERER may terminate this Agreement at any time and for any reason
         by giving OWNER not less than fifteen (15) days' written notice of
         termination.  In the event this Short Form Charter Agreement is
         terminated at any time prior to the end of the minimum term for any
         reason other due to the fault or breach of contract of OWNER,
         CHARTERER shall pay to OWNER an early termination fee consisting of
         the remaining unamortized balance of the actual cost incurred by OWNER
         at the outset of this Short Form Charter Agreement for the
         modifications described hereinbelow.

7.       Daily charter rate: The Vessel's daily charter rate payable to OWNER
         by CHARTERER for its use of the Vessel shall be as follows:

                 a.       Base Rate                         $3,700/day
                 b.       Extra Crew
                          i.      Cook-                     $  150/day
                          ii.     Messman-                  $  100/day
                          iii.   Mate-                      $  200/day
                 c.       Modification Fee-                 $1,094/day
                                                             ---------

                 Total daily charter rate-                  $5,244/day
<PAGE>   2
         Note, the aforesaid Modification Fee consists of fifty (50%) percent
         of the estimated modification cost specified hereinbelow amortized
         over the minimum term hereof.  Although OWNER and CHARTERER agree to
         work closely with each other in order to minimize, as much as
         possible, the modification cost, it is understood and agreed that the
         estimate is not binding on either party hereto; and OWNER's actual
         out-of-pocket expenses incurred in carrying out the modifications
         shall be controlling.  Therefore, after the actual modification cost
         has been fully incurred and calculated, the aforesaid Modification Fee
         shall be adjusted to ensure that OWNER's out-of-pocket expenses
         incurred in carrying out the modifications are fully reimbursed to
         OWNER.  OWNER shall provide CHARTERER with reasonable supporting
         documentation to verify the final calculation of OWNER's total
         out-of-pocket expenses incurred in carrying out the modifications; and
         once such costs have been fully amortized, CHARTERER's obligation to
         pay the Modification Fee shall lapse.

8.       Insured value of vessel:  U.S.D. $2,420,000,00.

9.       Special Provisions:

         A.      Special Seismic Modifications: At the outset of this Short
                 Form Agreement, OWNER shall carry out (or cause to be carried
                 out) certain modifications to the Vessel in order to permit
                 CHARTERER to operate the Vessel as a dual streamer seismic
                 vessel.  Those modifications, which are for CHARTERER's
                 account and are described in more detail in Exhibit "M"
                 hereto, are estimated to cost $380,552.00.  Of that amount, it
                 is estimated that OWNER will have an out-of-pocket expense of
                 $215,000 and the components stipulated in Exhibit M as being
                 provided by Horizon are estimated to cost $165,552.00. Prior
                 to the modifications being completed and the Vessel going into
                 service, CHARTERER shall pay to OWNER an "up-front"
                 modification he of $24,724.00, which consists of fifty (50%)
                 percent of the total estimated modification cost ($190,276.00)
                 less the said estimated cost of the Horizon-provided
                 components ($165,552.00).  The said up-front modification fee
                 also represents the difference between OWNER's aforesaid
                 estimated out-of-pocket expenses ($215,000.OO) and fifty (50%)
                 percent of the total estimated modification cost
                 ($190,276.00).  As provided for in the note to Clause 7 above,
                 the remaining balance of OWNER's out-of-pocket modification
                 cost shall be repaid by CHARTERER to OWNER over the aforesaid
                 six (6) month minimum charter term, with imputed interest
                 built in at the rate of one (1%) percent per month on the
                 unpaid principal.  At the conclusion of this Short Form
                 Agreement, the modifications shall be removed at CHARTERER's
                 expense; and, in accordance with Article VIII of the
                 referenced Blanket Time Charter, the Vessel must be restored
                 to the same condition as it was prior to the installation of
                 equipment or structural change, normal wear and tear excepted,
                 all at CHARTERER's expense.  All of the equipment and
                 structural material provided or fully paid for by CHARTERER as
                 part of the modification costs shall, at the time of removal
                 from the Vessel at the end of this Short Form Agreement in
                 accordance with this paragraph, be or become the property of
                 CHARTERER.

                 Notwithstanding anything to the contrary contained herein, all
                 additional modifications and/or equipment installations
                 requested by CHARTERER that are not specified in Exhibit "M"
                 for inclusion in the aforesaid cost estimate shall be
                 considered as separate items and shall be provided and/or
                 carried out by CHARTERER at its full cost and expense.

         B.      Meals, Victuals and Lodging:  Notwithstanding anything to the





                                       3
<PAGE>   3
                 contrary contained in Article VI of the reference Blanket Time
                 Charter, CHARTERER agrees that it will provide all victuals
                 for the Vessel.  OWNER will provide a cook and a messman to
                 prepare and serve the meals aboard the Vessel; and,
                 notwithstanding anything to the contrary confined in Article
                 XVIII. there will be no charge to CHARTERER for meals and
                 lodging provided by OWNER to Charterer's personnel aboard the
                 Vessel.

         C.      Standby Rate:  For the time that modifications and/or
                 additions are being removed from the Vessel for CHARTERER's
                 account and for the time that modifications and/or additions
                 are being added to the Vessel for CHARTERER's account at the
                 beginning of this charter (except during such time as the
                 Vessel is also undergoing routine, periodic drydocking of the
                 Vessel for OWNER's own account), CHARTERER shall pay to OWNER
                 a standby rate of hire in the amount of $3,500 per day plus
                 the aforesaid Modification Fee, unless the modification cost
                 has been completely amortized and the obligation to pay the
                 Modification Fee has lapsed.

         D.      Crew Size:  OWNER agrees that the crew complement required for
                 the operation of the Vessel, and which shall be furnished by
                 OWNER and is included in the Vessel's daily charter rate,
                 shall be a total of eight (8) persons, consisting of: a
                 master, two (2) mates, a chief engineer, a cook/able seaman, a
                 messman/ordinary seaman, an oiler, and another able seaman.

         E.      Except as otherwise provided in this Short Form Agreement,
                 OWNER, for a period of 180 days, warrants that all work and
                 installations carried out as part of the above-described
                 special seismic modifications to the Vessel will be free of
                 defects in material and workmanship, and all equipment
                 incorporated into the said special seismic modifications,
                 except that supplied, chosen or specified by CHARTERER, shall
                 be of good marine quality.  However, OWNER does not warrant
                 that any material or equipment purchased by it for
                 installation on the Vessel is free from manufacturer's
                 defects; and OWNER hereby specifically disclaims any
                 warranties, expressed or implied, with respect to such
                 material or equipment.  OWNER does hereby extend the
                 manufacturers warranty or guarantee, if any, to CHARTERER; and
                 OWNER agrees to use its best efforts and will cooperate with
                 CHARTERER in order to enforce any claims against the
                 manufacturers for defects that may occur.

                 The sole and exclusive remedy of CHARTERER for any warranty
                 claims under the Short Form Agreement shall be the obligation
                 of OWNER, during the aforesaid 180 day warrant period, to
                 repair and/or replace, or cause to be repaired or replaced,
                 any such defective workmanship or installation of materials
                 and equipment, provided such defects have not been caused by
                 the negligence of CHARTERER.  In no event shall OWNER be
                 responsible for any sum in excess of the cost of the repairs
                 or replacement as specified herein, it being specifically
                 understood that OWNER is not responsible for delay, demurrage,
                 loss of profits, loss of use or any other consequential
                 damages arising in connection with the aforesaid special
                 seismic modifications to the Vessel.

                 Some of the equipment to be installed on the Vessel as part of
                 the above-described special seismic modifications will be
                 supplied, chosen or specified by CHARTERER and some of it will
                 be used equipment, perhaps requiring refurbishment or repair
                 in order to make it operational.  It is hereby understood and
                 agreed that any costs incurred by OWNER in repairing or
                 refurbishing equipment supplied, chosen or specified by
                 CHARTERER will be for CHARTERER's





                                       4
<PAGE>   4
                 account as part of the total modification cost.  OWNER makes
                 no representations or warranties, express or implied,
                 regarding the condition, suitability for the purpose intended
                 or seaworthiness of the equipment supplied, chosen or
                 specified by CHARTERER, it being understood and agreed that
                 OWNER shall employ due diligence to repair, refurbish and
                 incorporate into the modifications any such equipment
                 supplied, chosen or specified by CHARTERER.  Furthermore, the
                 repair and/or replacement of any equipment supplied, chosen or
                 specified by CHARTERER occasioned by latent defects shall be
                 for CHARTERER's account and any delay of loss of time caused
                 thereby shall be at CHARTERER's expense and risk.

         All other terms and conditions of the referenced Blanket Time Charter
not inconsistent herewith, shall remain as originally written.  If the
foregoing meets with your approval, please sign both original counterparts
hereof and return one (1) of them to us for our files.

                                             Yours very truly,
                                  
                                             TIDEWATER MARINE, INC.
                                  
                                  
                                             /s/ Marinus Quint
                                             Vice President
                                  
MQ/ss                             
                                  
Enclosure                         
                                  
Agreed and Accepted               
Horizon Seismic, Inc.             
                                  
                                  
By: /s/ D. Burns (D. Burns)       
         Its: Vice President      

                          PARENT COMPANY GUARANTEE

         Exploration Holdings Limited, a U.K. corporation, hereby guarantees
to OWNER (Tidewater Marine, Inc.) the due performance of all of the obligations
of CHARTERER (Horizon Seismic Inc.) under the foregoing short form letter
agreement relating to the time charter of the M/V ABSHIRE TIDE, including,
without limitation, the obligation to make timely charter hire payments.

                                             GUARANTOR:
                                  
                                             Exploration Holdings Limited
                                  
                                  
                                  
                                             By: /s/ G.M. Harrison
                                                     Managing Director
                                  
                                  
Attest:                           
                                  
                                  
/s/ Neil A.M. Campbell            
Corporate Secretary               
                                  
(Corporate Seal)                  





                                       5

<PAGE>   1
                                                                 EXHIBIT 10.34.3


                                                              September 19, 1996
Horizon Seismic Inc.
11200 Westheimer St., Suite 410
Houston, Texas 77042

Attn:            Mr. Dave Burns
                 Vice President

     RE:  TIME CHARTER OF M/V ABSHIRE TIDE
                 OFFICIAL NUMBER 663944



Gentlemen:

         Reference is made to that certain letter agreement dated February 12,
1996 governing the time charter of the captioned vessel between Tidewater
Marine, Inc.  ("OWNER") and Horizon Seismic Inc. ("CHARTERER") pursuant to the
terms and conditions of that certain Blanket Time Charter dated February 9,
1996, between OWNER and CHARTERER. The purpose of this letter agreement is to
revise and extend the term of the reference letter agreement as follows:

           1.    Minimum Term - The minimum term specified in Clause 5 of the
                 referenced letter agreement is hereby extended through
                 September 19, 1997.

           2.    Daily Charter Rate - The text of Clause 7 of the referenced
                 letter agreement is hereby deleted and replaced with the
                 following:  "Effective at 0001 hours on September 20, 1996,
                 The Vessel's daily charter rate payable to OWNER by CHARTERER
                 for its use of the Vessel shall be Five Thousand Seven
                 Hundred and no/100 ($5,700.00) U.S. Dollars. In addition
                 CHARTERER shall pay OWNER One Hundred, Fifty and no/100
                 ($150.00) U.S. Dollars per day for a cook and One Hundred and
                 no/100 ($100.00) U.S. Dollars per day for a messman.

           3.    Crew Size - The text of Clause 9D of the referenced letter
                 agreement is hereby deleted and replaced with the following:
                 "OWNER" agrees that the crew complement required for the
                 operation of the Vessel, and which shall be furnished by OWNER
                 and is included in the Vessel's daily charter rate, shall be a
                 total of six (6) persons consisting of two (2) masters, one
                 (1) mate, one (1) engineer, one (1) oiler, and one (1)
                 able-bodied seamen.
<PAGE>   2
Horizon Seismic Inc.
September 19, 1996
Page 2



         All other terms and conditions in the referenced letter agreement and
in the Blanket Time Charter not inconsistent herewith shall remain as
originally written.  If the foregoing meets with your approval, please so
indicate by signing both counterparts hereof and returning one to them to us
for our files.


                                                     Very truly yours,

                                                     TIDEWATER MARINE, INC.

                                                     /s/ Marinus Quist

                                                     Marinus Quist
                                                     Vice President


Agreed and Accepted
Horizon Seismic, Inc.
By:  /s/ David Burns
         Its:  Vice President

<PAGE>   1

                                                               EXHIBIT 10.34.4
TIDEWATER MARINE

                                                                  March 25, 1996


Horizon Seismic Inc.
11200 Westheimer St., Suite 410
Houston, Texas 77042

Attention:                Mr. Dave Burns
                          Vice President

         Re:              Time Charter of M/V ABSHIRE TIDE, Official Number
                          663944

Gentlemen:

         Reference is made to that certain letter agreement dated February 12,
1996 governing the time charter of the captioned vessel between Tidewater
Marine, Inc. ("OWNER") and Horizon Seismic Inc. ("CHARTERER") pursuant to the
terms and conditions of that certain Blanket Time Charter dated February 9,
1996 between OWNER and CHARTERER.  The purpose of this letter agreement is to
add a new Special Provision 9F to the referenced letter agreement as follows:

         "Notwithstanding the provisions of Article XI (ii) of the referenced
Master Time Charter, for purposes of this letter agreement relating to the
Vessel, the level of Protection and Indemnity Insurance carried by OWNER shall
be U.S.D. $20,000,000."

         All other terms and conditions in the referenced letter agreement and
Blanket Time Charter not inconsistent herewith shall remain as originally
written.  If the foregoing meets with your approval, please so indicate by
signing both counterparts hereof and returning one of them to us for our files.

                                      Very truly yours,
                                      
                                      TIDEWATER MARINE, INC.


                                      Marinus Quist
                                      Vice President

Agreed and Accepted                    
Horizon Seismic Inc.

By:________________________
         Its:


<PAGE>   2
MQ/ss


TIDEWATER MARINE, INC.
1440 Canal Street
New Orleans, Louisiana 70112-2780
Telephone: (504) 568-1010
Telex: 460050 or 460051
Telecopy: (504) 566-4582

A Tidewater Company

<PAGE>   1
                                                                 EXHIBIT 10.35.1


                                         SUPPLEMENTAL SECURITY AGREEMENT NO. ONE
                                                              LOAN #20040096-001

This Supplemental Security Agreement is executed by SEITEL GEOPHYSICAL, INC.
("Borrower") pursuant to the terms of a Loan and Security Agreement dated
February 22, 1996 between Borrower and MetLife Capital Corporation ("Lender").
All capitalized terms used herein that are not otherwise defined herein shall
have the respective meanings given to such terms in the Loan and Security
Agreement.

         In order to provide security for the payment and performance of
Borrower's obligations under the Loan Documents, Borrower has granted to Lender
a first priority security interest in the Collateral.  In addition to said
grant, Borrower intends by this Supplemental Security Agreement to grant to
Lender a first priority security interest in the items of Equipment identified
herein.

         1.      To further secure the payment and performance of all of
Borrower's obligations to lender under the Loan Documents, Borrower hereby
grants to Lender a first priority security interest in the items of Collateral
described below, including all present and future additions, attachments and
accessories thereto, all substitutions therefor and replacements thereof and
all proceeds thereof, including all proceeds of insurance.

<TABLE>
<CAPTION>
QTY.             MODEL/MFR.                DESCRIPTION              SERIAL NO.               COST OR APPRAISED VALUE
<S>              <C>                       <C>                      <C>                       <C>
50                                         CONFIGURABLE SAR         830 THRU 879             $443,000.00
</TABLE>

         2.      Borrower hereby (a) affirms that the representations and
warranties set forth in Section 5 of the Loan and Security Agreement are true
and correct as of the date hereof; (b) represents and warrants that Lender has
a first priority interest in the Collateral; and (c) represents and warrants
that the above-described equipment will be maintained at the following
location(s):

                 59 HIGHWAY SOUTH
                 ROSENBERG, TEXAS 77471

3.       The Loan Amount for loans to be made pursuant to this Supplemental
         Security Agreement is $433,000.00.

4.       The Commitment Expiration Date of loans to be made pursuant to this
Supplemental Security Agreement is MARCH 31, 1996.

5.       The amount of liability insurance required to be maintained by
Borrower pursuant to Section 6(d) of the Loan and Security Agreement is
$300,000.00.

6.       All of the terms and provisions of the Loan and Security Agreement are
hereby incorporated in and made a part of this Supplemental Security Agreement
to the same extent as if fully set forth herein.

         In witness whereof, Borrower has executed and delivered this
Supplemental Security Agreement this 22nd day of February, 1996.

                                       Borrower:  SEITEL GEOPHYSICAL, INC.
                                  
                                       By: /s/  Debra D. Valice
                                       Name: Debra D. Valice
                                       Title: Secretary/Treasurer
                                  
                                 

<PAGE>   1
                                                                 EXHIBIT 10.35.2


No. 2004076-001                                             TERM PROMISSORY NOTE
$ 433,000.00                                                      March 14, 1996


         FOR VALUE RECEIVED, the undersigned, SEITEL GEOPHYSICAL, INC.,
("Maker"), promises to pay to the order of MetLife Capital Corporation
("Payee"), at its office at P.O. Box C-97550, Bellevue, Washington 98009, the
principal sum of FOUR HUNDRED THIRTY THREE THOUSAND AND NO/100TH ($433,000.00)
DOLLARS together with interest on unpaid principal from the date of
disbursement of such principal amount until payment in full at a rate of 7.52
percent (7.52%) per annum ("Rate") computed on the basis of a 360 day year of
twelve consecutive thirty day months.  Interest hereunder shall be paid on the
unpaid principal, together with principal, in THIRTY SIX (36) installments of
THIRTEEN THOUSAND FOUR HUNDRED SEVENTY TWO DOLLARS AND 97/100THS ($13,472.97)
commencing on April 14, 1996 and monthly thereafter until March 14, 1999, on
which date the entire balance of principal and interest unpaid shall be due and
payable.  It is agreed that each installment, when paid, shall be applied by
the holder hereof, first so much as shall be required to the payment of
interest accrued as specified hereto, and the balance thereof to the repayment
of the principal sum.

         Except as may be otherwise expressly provided herein, this Note may
not be prepaid in whole or in part, except with the prior written consent of
Payee, Maker shall have the privilege of prepaying all (but not part) of the
then outstanding balance under this Note on March 14, 1998 or on any
installment due date thereafter, subject to giving thirty (30) days prior
written notice to Payee specifying the date of prepayment and further subject
to payment of a prepayment premium equal to the amount, if any, required to
offset the adverse impact to Payee of any decline in interest rates.  The
prepayment premium is determined by (i) calculating the decrease, expressed in
basis points (but not less than zero) in the current weekly average yield for
Two (2)-year U.S. Treasury Constant Maturities as published in Federal Reserve
Statistical Release H.15(519) (the "Index" from the weekly average yield of
5.040 as of January 23, 1996 to the Friday (or, if Friday is not a business
day, the last business day) of the week immediately preceding the prepayment
date (ii) dividing the difference by 100, (iii) multiplying the result by the
applicable "Premium Factor" set forth below, and (iv) multiplying the product
by the principal to be prepaid.  Any prepayment shall be applied first to the
prepayment premium, if any, next to accrued interest and late charges (if any),
and thereafter to the principal then outstanding.  The Premium Factor shall be
the amount shown on the following chart for the month in which prepayment
occurs.





[   ]  METLIFE CAPITAL
<PAGE>   2
<TABLE>
<CAPTION>
         NUMBER OF MONTHS REMAINING        (YEARS)          PREMIUM FACTOR
                  <S>                        <C>                 <C>
                  12 - 1                     (1)                 .005
</TABLE>

In the event the Federal Reserve Board ceases to publish Statistical Release
H.15(519), then the decrease in Two-Year U.S. Treasury Constant Maturities will
be determined from another source designated by Payee.

         If Maker shall have given to Payee notice of Maker's intention to so
prepay, Maker shall not then be entitled to withdraw such notice, and the
indebtedness proposed to be prepaid in such notice together with the aforesaid
prepayment fee, if applicable, shall be due and payable upon the date specified
for such prepayment in such notice.  Upon the occurrence of an Event of Default
and acceleration of payment of indebtedness evidenced hereby during a period
open to prepayment, Maker shall pay to Payee, in addition to any and all other
sums due and payable hereunder, as liquidated damages for the loss of Payee's
investment and not as a penalty, an amount equal to the prepayment fee which
would have been payable hereunder on such date of acceleration in the event of
a voluntary prepayment.  Maker and Payee agree that the foregoing amounts do
not constitute penalties but rather constitute reasonable calculations of the
investment loss that would be sustained by Payee in the event of such
prepayment.

         It is specifically understood and agreed by Maker that, in the event
of a default under this Note or under any instrument securing the Note, a
tender of payment of the unpaid principal and accrued interest then outstanding
shall be deemed a prepayment, and, accordingly, said tender must include the
premium herein above required, or if said tender is made prior to the time this
privilege is operative, then said tender must include a premium equal to six
(6) months' interest at the Rate computed on the principal amount so tendered.
It is further understood and agreed by Maker that Payee shall not be obligated
to accept said tender, and said tender shall for all purposes be deemed
ineffectual and deficient, unless said tender shall include the premium herein
above-required.

         In the event that Payee does not receive any payment on the date due,
Maker will pay Payee a late charge of five percent (5%) of the payment
outstanding together with the payment and, provided said sum is received within
ten (10) days of the date due, Payee agrees not to demand immediate payment of
the whole sum of principal and interest as otherwise permitted herein.

         If, from any circumstances whatsoever, payment of any obligation due
under this Note at the time such performance shall be due shall involve
exceeding the maximum amount currently prescribed by any applicable usury
statue or any other applicable law, then such obligation shall be reduced to
such maximum amount,





[   ]  METLIFE CAPITAL
<PAGE>   3
so that in no event shall any payment be possible under this Note, or under any
other instrument evidencing or securing the indebtedness evidenced hereby, that
is in excess of such maximum amount.

         In the event that an Event of Default shall occur under the Loan and
Security Agreement (as hereinafter defined) or any other instrument now or
hereafter securing repayment hereof, following any required notice and/or the
expiration of any applicable period of grace, then, and in such event, the
principal indebtedness evidenced hereby, and any other sums advance hereunder,
together with all unpaid interest accrued thereon, shall, at the option of
payee, at once become due and payable and may be collected forthwith,
regardless of the stipulated date of maturity.  TIME IS OF THE ESSENCE WITH
RESPECT TO THIS NOTE.  Interest shall accrue on the outstanding principal for
so long as such default continues, regardless of whether or not there has been
an acceleration of the indebtedness evidenced hereby as set forth herein, at
the rate equal to the less or fifteen percent (15%) per annum or the maximum
rate allowable under law.  All such interest shall be paid at the time of and
as a condition precedent to the curing of any such default should Payee, at its
sole option, allow such default to be cured.  In the event this Note, or any
part thereof, is collected by or through an attorney-at-law, Maker agrees to
pay all costs of collection including, but not limited to, reasonable
attorneys' fees, whether or not suit is filed.

         This Note is one of the notes referred to in and is secured by the
Loan and Security Agreement dated February 22, 1996 between Maker and Payee.
The terms of the Loan and Security Agreement are incorporated herein by
reference.

 This Note consolidates the following Interim Notes executed by Maker in favor
                                   of Payee

<TABLE>
<CAPTION>
INTERIM NOTE NUMBER                DATE                  PRINCIPAL AMOUNT
<S>                                <C>                   <C>
Request for Loan Proceeds One      March 14, 1996        $433,000.00
</TABLE>

         Maker waives any right of exemption and waives presentment, protest
and demand and notice of protest, demand and of dishonor and nonpayment of this
Note, and consents that any holder hereof shall have the right, without notice,
to grant any extension or extensions of time for payment of this Note or any
part thereof or any other indulgences or forbearances whatsoever, or may
release any of the security for this Note without in any way affecting the
liability of any other party for the payment of this Note.

         The due payment and performance of Maker's obligations hereunder shall
be without regard to any counterclaim, right of offset, or any other
counterclaim whatsoever which Maker may have against Payee and without regard
to any other obligations of any





[   ]  METLIFE CAPITAL
<PAGE>   4
nature whatsoever which Payee may have to Maker, and no such counterclaim or
offset shall be asserted by Maker in any action, suit or proceeding instituted
by Payee for payment of Maker's obligations hereunder.

         This Note and the Loan and Security Agreement shall be governed by and
construed in accordance with the laws of the State of Washington.

         Maker acknowledges that there is no presumption that the value of the
property securing this Note is equal to the face amount of the Note, and that a
deficiency judgment may be necessary in proceedings taken for enforcement
hereof.

         No amendment to this Note shall be binding upon Payee unless it is in
writing and duly signed by Payee.

         IN WITNESS WHEREOF, the Maker has caused these presents to be duly
signed the date first above written.

                                              Borrower: SEITEL GEOPHYSICAL, INC.

                                              By:      /s/ Debra D. Valice

Witness: /s/ Karen S. Duxbury                 (Print Name)  Debra D. Valice

                                              Title:      Vice President





[   ]  METLIFE CAPITAL

<PAGE>   1

                                                                  EXHIBIT 10.36


                               SERVICE AGREEMENT

                                    between

                              HORIZON SEISMIC INC.

                                      and

                                SHANGHAI BUREAU

                                       of

                            MARINE GEOLOGICAL SURVEY

                             MV DISCOVERER/FA XIAN
<PAGE>   2
                               SERVICE AGREEMENT

                                      for

                                 MV DISCOVERER


         This Service Agreement, hereinafter referred to as the "Agreement"
made effective the 12th day of April, 1994, is by and between the Shanghai
Bureau of Marine Geological Survey whose address is 526 Yan An Road West,
Shanghai, P.R.  China, hereinafter referred to as "Owner", as the Owner of the
Vessel Discoverer, and Horizon Seismic Inc. whose address is 11200 Westheimer,
Suite 200, Houston, Texas 77042, USA, hereinafter referred to as "Company", as
the Charterer.

1.       NATURE OF SERVICE

1.1      Owner agrees to let and Company agrees to hire the Seismic Vessel, her
         engines, tackle, gear, appurtenances and related Seismic equipment,
         material and supplies, as specified in Schedule A, collectively the
         "Seismic Vessel" for a period of one year from the time of its arrival
         at Galveston, USA.

1.2      Company shall have the option to extend the initial period by up to
         two additional periods each of six months.  Each option shall be
         exercised by Company giving sixty days notice to Owner prior to the
         expiry of the initial or first additional period.

         Company shall pay Owner for the initial period at the Rates defined in
         Clause 9 herein.  Rates for any additional period or periods shall be
         defined in a separate agreement.

1.3      Company shall employ the Seismic Vessel throughout the world in lawful
         activities for marine geophysical and/or oceanographic and/or
         associated or related duties as required by Company.

2.       COMMENCEMENT

2.1      Charter of the Seismic Vessel by Company shall commence on or about
         the 1st day of May, 1994, and more precisely when the Seismic Vessel
         departs Shanghai.

2.2      A joint survey of the Seismic Vessel shall be undertaken by Company
         and Owners to determine the precise condition of the Seismic Vessel
         and its equipment, before its departure from Shanghai.
<PAGE>   3
3.       OWNERS TO PROVIDE

3.1      In consideration of the payment by Company of the Charter Fees in
         accordance with Clause 9 of this Agreement, Owners shall provide
         (except as otherwise specified) the following services, spares,
         replacement parts (excluding same for seismic equipment but including
         the seismic compressor sets) and other items referred to herein
         entirely at the cost of Owners without any right of reimbursement from
         Company.  For the avoidance of doubt Owners shall not be responsible
         for the provision of filters, oil or other consumeables for the
         seismic compressor sets.

3.2      The Owners shall provide and pay for all wages for Officers and Crew,
         travel expenses of the People's Republic of China personnel including
         Officers and Crew, insurance of the Vessel (including hull and
         machinery and protection and indemnity insurance) and for all deck and
         engine room store, and the expenses of maintaining the hull and
         machinery (excluding seismic equipment, but including the seismic
         compressor sets) in a thoroughly efficient state during the duration
         of this agreement including (but not limited to) the expenses of
         providing replacement parts, equipment or spares, dry docking and
         other external services provided in relation to the maintenance of the
         hull and machinery as aforesaid.

3.3      The Owners shall also provide and pay for all bedding and galley
         equipment, including the necessary renewal of same, for officers, Crew
         and Company's personnel and their representatives, but not cleaning
         materials for cabins, common areas and work areas.

4.       COMPANY TO PROVIDE AND COMPANY TO PAY

4.1.     Company shall be responsible for bunkers lubricating oils and fresh
         water, it being understood that the acceptance of each supply
         (including bunkers) is the responsibility of the Chief Engineer.

4.2.     Company shall be responsible for reimbursing Owners for any
         extraordinary or special taxes, other than those of the Nation of the
         Vessel's Registry or the People's Republic of China levied on the
         Owners and/or the Vessel and/or the Crew.

5.       EXCLUDED PORTS

5.1.     The Seismic Vessel shall not be ordered to nor bound to enter any
         place where fever or epidemics are prevalent or to which the Master,
         Officers and Crew are by Law not bound to follow the Seismic Vessel.

5.2.     The Seismic Vessel shall not be ordered to nor bound to enter any ice
         bound place where lights, lightships, marks and buoys are or are
         likely to be withdrawn by reason of ice on the Seismic Vessel's
         arrival or where there is risk that ordinarily the Seismic Vessel will
         not be able on account of ice to reach her destination or get out.
         If, on account of ice,





                                     - 3 -
<PAGE>   4
         the Master considers it dangerous to remain in any area or place for
         fear of the Seismic Vessel being frozen in and/or damaged, he has
         liberty to sail to a convenient open place and await the Company's
         fresh instructions.

5.3.     The Seismic Vessel shall not be obliged to force ice.

5.4.     Save the above, the Company shall be entitled to require Owners to
         sail the Seismic Vessel to any port or ports around the world subject
         to Clause 18 and 21 but otherwise without exclusion.

6.       THE SEISMIC VESSEL

6.1.     From the time the Charter of the Seismic Vessel commences under this
         Agreement, Owners warrant that the Seismic Vessel shall fully conform
         to the specifications stated in Schedule A herein and shall in every
         way be fitted and ready for service throughout the world (unless
         otherwise stated in Schedule A).

6.2.     During the period of the Agreement, the Seismic Vessel shall at all
         times sail with a minimum crew of fifteen and minimum seismic
         personnel numbering nine namely:

                 Master
                 Chief Officer
                 Second Officer
                 Chief Engineer
                 Second Engineer
                 Third Engineer
                 Electrician
                 Radio Officer/Steward
                 Two Able Seamen
                 Two Oilers (Motormen)
                 Two Cooks
                 Steward
                 1 project manager
                 2 seismic observers
                 2 seismic navigators
                 4 seismic mechanics

                 See also Clause 9.5 herein.

6.3.     Throughout the duration of this agreement, the Owners warrant the
         Seismic Vessel will be fully certificated and shall conform in every
         respect with the Bahamas Flag and that all national and international
         trading certificates, loadline, fire fighting, life saving and other
         relevant regulations are fully complied with and remain in full force
         and effect.





                                     - 4 -
<PAGE>   5
6.4.     The Owners warrant and agree to, at their sole expense: (1) keep the
         Seismic Vessel in a thoroughly efficient state in hull, machinery and
         equipment in good running order and in every respect seaworthy (2) pay
         all wages, salaries, taxes and other benefits prescribed for all
         Owners personnel operate and maintain the Seismic Vessel, excluding
         seismic equipment, in accordance with all applicable State and Federal
         Laws, rules and regulations of jurisdictions in which the Seismic
         Vessel is working and carry on board required documents.

6.5.     Owners shall comply with the requirements of Company in ensuring the
         whole reach and burden and lawful decks of the Seismic Vessel shall be
         available for Company's marine activities.  Such availability shall be
         limited to those activities and operations that do not exceed the
         design specification of the vessel and in particular the load
         specification of the decks.

7.       PERIOD OF CHARTER

7.1.     Subject to Clause 1.2 and Clause 8 and Clause 9, this Charter
         Agreement shall run for a period of twelve months, from the date of
         arrival at the Port of Galveston.

8.       EARLY TERMINATION OF CHARTER AGREEMENT

8.1.     The Company shall have the sole right to terminate this Charter
         Agreement upon 35 days notice to Owners at any time and upon the
         expiry of such notice the company shall pay a lump sum cancellation
         fee of US$85,000 (Eighty Five Thousand United States Dollars) to the
         Owners.  However, should the Company terminate this agreement in
         accordance with Clause 17 of this agreement no cancellation fee shall
         then apply.

8.2.     In the event of a termination of this Agreement in accordance with
         Clause 8.1 above the liability of Company to pay the Charter Fees to
         Owners shall cease forthwith without prejudice to the rights of the
         parties in respect of any amounts due from one to the other at the
         time of termination and without prejudice to any claims which have
         arisen between the parties prior to the date of termination.

8.3.     In the event of a termination of the Agreement for any reason
         whatsoever, Company and Owners shall undertake a joint survey of the
         Seismic Vessel to determine the condition of the Seismic Vessel and
         its equipment at such time, and Company hereby warrants that the
         Seismic Vessel shall at the time of termination of this Agreement be
         in the same condition as at the time Charter of the Vessel commenced
         under Clause 2.1 and Clause 2.2 above, fair wear and tear excepted,
         and Company shall indemnify Owner in respect of any breach of this
         warranty.





                                     - 5 -
<PAGE>   6
9.       CHARTER

9.1.     For the mobilisation period between departure of the Seismic Vessel
         from the Port of Shanghai until arrival at the Sea Buoy off the Port
         of Galveston or later time if the Seismic Vessel does not in every
         respect meet the terms of this Agreement, Company shall pay to Owner a
         lump sum fee of US$280,000 (Two Hundred and Eighty Thousand United
         States Dollars), and shall not be liable to pay any other Charter Fee
         or daily rate in respect of this period.  Company shall pay Owners for
         fuel, lube oil, water, canal fees, pilotage and towing during the
         mobilization unless such fuel, canal fees, pilotage and towing are
         related to a break-down or other failure of the Seismic Vessel,
         Equipment or Crew.

9.2.     Commencing from the time of arrival of the Seismic Vessel at the sea
         buoy off the Port of Galveston until the time such Charter terminates
         in accordance with the provisions hereof and subject to Clauses 15, 19
         and Schedule B, and the other relevant provisions of this Agreement
         Company shall pay to Owners the following fixed daily Charter Fees (or
         pro rata for part thereof):  US$7,000 (Seven Thousand United States
         Dollars).

9.3.     During the demobilizing period from the time of departure from the
         last port of operations until the time of arrival of the Seismic
         Vessel off the Port of Shanghai and subject to the Seismic Vessel
         continuing to meet the performance specifications described elsewhere
         in this Agreement, Company shall continue to pay the Charter Fee as
         defined in Clause 9.2 above and shall additionally pay or reimburse
         Owner for fuel, lube oil, water, canal fees, pilotage, towing and
         victualling.  Company shall not be liable to pay the Charter Fee or
         reimburse Owner in respect of time lost or fuel, canal fees, pilotage;
         towing victualling or any other expense during or as a result of break
         down or deficiency of the Seismic Vessel Equipment or Crew.

         In the event, on expiry or termination of this Agreement, Owners elect
         not to return the Seismic Vessel immediately to Shanghai but undertake
         additional work independently or with another charter or joint venture
         company, Company shall be relieved of its obligation to pay the
         Charter Fee or other expenses which would have arisen during the
         period of demobilisation.

9.4.     The Owners and Company shall meet approximately five months after the
         commencement of the Charter to review the anticipated operation of the
         Seismic Vessel for the remaining part of the Charter.  Subject to
         mutual agreement Owners and Company may elect to change the Charter to
         a profit and risk-sharing joint venture for a remaining part of the 12
         month charter period, and/or its extension.

9.5.     Should the Company require Owners to increase the manning level, as
         stated in Clause 6 herein, Owners shall immediately increase the
         manning levels whereupon Company shall pay Owners daily increases in
         total costs, including all travelling expenses.





                                     - 6 -
<PAGE>   7
9.6.     If due to special local legislation in any areas where the Seismic
         Vessel may operate during the period of the Agreement, where the
         Owners are required to change part of or all of the Crew or increase
         the manning levels of the Seismic Vessel to comply with such special
         legislation, Company shall reimburse Owners for any proven increase in
         crewing costs.

         This Clause shall not be construed to relieve Owners from their
         responsibility to provide at all times a fully qualified and
         certificated Crew onboard the Seismic Vessel for worldwide trading.

10.      VICTUALLING

10.1.    The Company shall pay for all victualling costs.

10.2.    Owners shall maintain a qualified catering team consisting of three
         persons onboard the Seismic Vessel and meals shall be of high standard
         and menus will be varied.  The cook will provide the Company's party
         manager onboard with a weekly menu in advance and Company reserves the
         right to amend proposed menus, to ensure an acceptable level of
         victualling is always maintained.

10.3.    Company's personnel on night duty shall be allowed access to the
         galley or other suitably designated area, where they can obtain cold
         salads or light snacks, it always being understood that the Seismic
         Vessel's catering personnel will not be on duty and that Company's own
         personnel shall not interfere with galley equipment.

10.4.    Company and Owners agree that any personnel in their employment found
         to be under the influence of alcohol or drugs whilst onboard the
         Seismic Vessel, shall be subject to instant dismissal.

11.      PAYMENT

11.1.    Owners shall invoice Charter Fees or other amounts due from time to
         time hereunder per calendar month, whereby Owners shall invoice
         company on the last day of each month worked and Company shall pay
         Owners so that the funds are received by Owners within thirty days of
         their invoice date.

11.2.    Owners invoices for other costs due from Company shall be accompanied
         by supporting documentation and shall be submitted to Company
         "hereafter company shall make payment to Owner within thirty days from
         the invoice date.

11.3.    Where Company has provided goods, services or equipment or incurred
         expense at the request of and with the approval of Owners, Company
         shall be entitled to deduct such costs and or expense from any Charter
         Fees due to Owners.





                                     - 7 -
<PAGE>   8
12.      MODIFICATIONS AND ADDITIONS TO VESSEL

12.1.    Upon commencement of the Charter of the Seismic Vessel under Clause
         2.1 herein, Owners shall always ensure Company, their agents and
         servants have full access at all times to the Seismic Vessel to
         undertake modifications to the Seismic Vessel and embark and install
         their equipment.

12.2.    All structural modifications and alterations undertaken by the Company
         their agents or servants to the Seismic Vessel shall be at the
         Company's own cost, subject to prior approval by Owner and shall be at
         the approval of the Seismic Vessel's Classification Society and/or
         other relevant safety authorities.

12.3.    At the termination or expiry of this Agreement, Company agrees at its
         option to either reinstate or pay Owner to reinstate the Seismic
         Vessel and Equipment back to its condition at the time the Charter
         commenced, fair wear and tear excepted.

13.      RESPONSIBILITY & EXEMPTION

13.1.    Company shall not be responsible for loss or damage to any property of
         Owners nor any personal injury or death of Owners personnel howsoever
         or by whomsoever caused, even if caused by act, neglect, default of
         Company, and arising from and in connection with such loss or damage
         or personal injury or death of Owners' personnel.

13.2.    Provided Owners shall have complied with the insurance requirement
         Clause 14 hereof Owners shall not be responsible for damage to
         property of Company nor for personal injury or death of company's
         personnel howsoever or by whomsoever caused, even if caused by act,
         neglect or default of Owners and Company agrees to indemnify Owners
         against all consequences and liabilities arising from or in connection
         with such loss or damages or personal injury or death of Company's
         personnel.

13.3.    The Owners hereby agree to indemnify and hold harmless Company from
         and against any loss or liability (including legal expenses) arising
         out of any claim or cause of action for or loss of damage to property
         or third parties of for injury to or loss of life of third person,
         caused by or as a result of Owners operation of the Seismic Vessel.

13.4.    The Company hereby agrees to indemnify and hold harmless Owners from
         and against any loss or liability (including legal expenses) arising
         out of any claim or cause of action for or loss of damage to property
         of third parties or for injury to or loss of life of third person,
         caused by or as a result of Company's Seismic operations.

14.      INSURANCE

14.1.    The Owners agree to maintain at their expense, for the duration of the
         Charter:





                                     - 8 -
<PAGE>   9
                 "Hull and Machinery" (All Risks) including Collision Liability
                 - sum insured up to full value of the Seismic Vessel being US
                 Dollars $7,000,000 (Seven million United States Dollars).

                 "Protection & Indemnity" - sum insured up to full value of the
                 Seismic Vessel including Wreck Removal with unlimited, as per
                 rules of P&I Club and including Oil Pollution liability
                 indemnity up to maximum of US$ 500,000,000 (Five Hundred
                 Million United States Dollars).

                 "Employers Liability" insurance relative to Owners employees.

                 The above insurances will be subject to review prior to the
                 Seismic Vessel coming on Charter.

14.2.    At Company option, Company shall be named as additional assured in
         Owners placed insurance policies for the Protection & Indemnity.

14.3.    Whenever called for under any contracts with Company's clients Owners
         shall produce to Company a certificate or a certified copy of the
         insurance policies effected in accordance with the provisions of this
         Agreement or such other confirmation as may be acceptable to the
         Company.

         If Owners fail to or refuse to obtain, or maintain, or demonstrate any
         of the above insurances required by the clients under Company's
         contracts with them, then Company shall have the right to cease paying
         the Charter Fees.

14.4.    Neither party to this agreement shall be liable to the other for any
         consequential or special damage.

15.      DAMAGE OR BREAKDOWN OF SEISMIC VESSEL

15.1.    Subject to Clause 19. during any event of whatsoever nature which
         hinders or prevents the full working of the Vessel including (but not
         limited to the generality of the foregoing) drydocking or other
         necessary measures to maintain the efficient operation of the Seismic
         Vessel, deficiency of men or stores, strike of Master, officers or
         crew, breakdown of machinery or equipment, damage to hull or other
         accident (whether or not required by Company and whether or not due to
         negligence of Owners), and during any period in which the Seismic
         Vessel and her equipment is not fully operational (whether or not
         required for service), no Charter Fees shall be payable by Company.

15.2.    The provisions of Clause 15.1 herein shall include the specific events
         stipulated in Schedule B whereby Company shall be released from any
         liability to pay Charter Fees for the duration of such events as
         further specified in Schedule B herein.





                                     - 9 -
<PAGE>   10
16.      LOSS OF SEISMIC VESSEL

16.1.    Should the Seismic Vessel be lost or missing, this Agreement shall be
         deemed to have been terminated and Charter Fees to cease from the date
         when the Seismic Vessel was lost.  If the date cannot be ascertained,
         fifty percent of the daily Charter Fee shall be paid from the date the
         Seismic Vessel was last reported until the calculated date of arrival
         at her destination, or 30 days whichever shall be appropriate.

17.      CANCELLATION

17.1.    In the event of Company being released from its liability to pay to
         Owners the Charter Fees in accordance with the terms of this Charter
         Agreement for thirty consecutive days or in the event of a material
         breach by Owners of the provisions of this Agreement, Company shall
         have the option of cancelling this Agreement, Company, if required by
         Owners, to declare within forty-eight hours after receiving notice
         whether they cancel this Agreement or not.  In default of any written
         notice from Owners, Company shall have the right of automatically
         cancelling this Agreement at any time after the said period of 30 days
         or breach, without noting any protest and without interference by any
         court, any formality whatsoever and without prejudice to any claim the
         Company may otherwise have on the Owners.

18.      MASTERS AND CREW

18.1.    The Master shall prosecute all voyages and operations with the utmost
         diligence and despatch, and, so comply fully and accurately with the
         operating schedules laid down by the Company and their party manager,
         without compromising the safety of the ship and/or of the Crew.  The
         Master shall be under the orders of Company as regards employment or
         agency.

                 The Company shall advise the Master as to general location of
                 the Seismic Vessel's operational area and the Master shall be
                 solely responsible for the selection of the route from and to
                 such area.  If the Master shall reasonably consider that the
                 instructions given by the Company or their party manager
                 endanger the safety of the Seismic Vessel and\or of the Crew,
                 he must advise the party manager accordingly and the Master is
                 entitled not to follow such instructions.  The Master,
                 Officers and Owners' Crew will fully co-operate with the
                 Company, their party manager and crew, with a view to the full
                 and satisfactory performance of the service.

18.2.    If the Company has good reason to be dissatisfied with the conduct of
         the Master, Officers or ratings of Owners crew, the Owner shall as
         soon as possible replace the person or persons in question.
         Immediately after such replacement or replacements a joint
         investigation by Company and Owners shall be conducted in order to
         ascertain that such complaint or replacement was reasonable to ensure
         a continuous smooth operation.





                                     - 10 -
<PAGE>   11
         Notwithstanding the foregoing, any member of the Seismic Vessel's crew
         found to be under the influence of alcohol or drugs, shall be, as far
         as practically possible, immediately removed from the Seismic Vessel.

18.3.    The Seismic Vessel shall work day and night, if required, without any
         extra payment by the Company.

18.4.    The Master and Engineer shall keep full and correct logs accessible to
         the Company or their agents at all times.

18.5.    Decisions concerning the safety of the Seismic Vessel and/or the
         personnel onboard shall be the responsibility of the Seismic Vessel's
         Master.  The safety of the Companies' seismic equipment, whether on
         board or deployed from the Seismic Vessel is, however, the sole
         responsibility of the Company, through the auspices of the Party
         Chief.

18.6.    Should the Company have reason to be dissatisfied with anything for
         which the Owners are responsible, Company shall promptly inform Owners
         in writing whereafter Owners will promptly look into the matter.

19.      MAINTENANCE OF SEISMIC VESSEL

19.1.    Notwithstanding the provisions of Clause 15 herein, Company shall
         allow Owners one day of 24 hours per calendar month or pro rata for
         part thereof for maintenance and/or overhaul and/or repairs at times
         to be mutually agreed between both parties and during such period
         Company shall continue to be liable to pay to Owners the Charter Fees.
         Days can be accumulated up to a maximum of twelve days but days not
         taken by Owners will not be compensated by Company at the end of this
         Agreement.  Any planned drydocking and/or overhauls and/or repairs are
         to be co-ordinated with Company but should be scheduled between 1st
         December and 1st March each year.  Company shall, however, have the
         right to request Owners to bring forward repairs or, subject to
         Classification approval, delay same to be co-ordinated with Company's
         own planned maintenance, repairs and renewal.

19.2.    Notwithstanding the provisions of Clause 15 herein, Company shall
         allow Owners to carry out maintenance or overhaul of the Seismic
         Vessel when Company's own equipment is being maintained, repaired or
         overhauled provided that the services of the Seismic Vessel are not
         immediately required by Company and during such period Company shall
         continue to pay to Owners the Charter Fees.  Should, however, the
         Seismic Vessel not be ready to sail as required by Company the Charter
         Fees for such period shall cease to be payable by Company to the
         Owners, backdated to the time Owners originally commenced any
         maintenance or overhaul of the Seismic Vessel (other than days allowed
         in accordance with Clause 19.1 above).





                                     - 11 -
<PAGE>   12
20.      SALVAGE

20.1.    All salvage and all proceeds from derelicts other than Company's
         property shall be divided equally between the Company and Owners after
         deducting the Master's, Officers', Crew's and Company's personnel's
         share, hire of Seismic Vessel for time lost and cost of the fuel
         consumed and all other expenses (including Crew and Company's
         personnel costs) incurred.  Apportionment of all loss of time and all
         expenses paid, excluding damage to or loss of the Seismic Vessel
         incurred in salvage shall be mutually agreed between Company and
         Owners prior to any salvage attempts. No attempt to undertake salvage
         shall be made by the Seismic Vessel unless such has been mutually
         agreed between the parties or unless there is a legal obligation upon
         the Master or Owners to carry out salvage.

21.      WAR

21.1.    The Seismic Vessel, unless the consent of the Owners be first
         obtained, shall not be ordered to any place or on any voyage nor be
         used on any service which will bring her within a zone which is
         dangerous as a result of any actual or threatened act of war, war
         hostilities, warlike operations, acts of piracy or of hostility or
         malicious damage against this or any other Vessel or its cargo by any
         person, body or state whatsoever, revolution, civil war, civil
         commotion or the operation of international law, nor be exposed in any
         way to any risks or penalties whatsoever consequent upon the
         imposition of sanctions nor carry any goods that may in any way expose
         her to any risks of seizure, capture, penalties or any other
         interference of any kind whatsoever by the belligerent or fighting
         powers or parties or by any Government or Ruler.

21.2.    Should the Seismic Vessel approach or be brought or ordered within
         such zone, or be exposed in any way to the said risks, (1) Owners to
         be entitled from time to time to insure their interests against any of
         the risks likely to be involved thereby on such terms as they shall
         think fit, Company to make a refund to the Owners of the premium on
         demand and (2) notwithstanding the provisions of Clause 15 Charter
         Fees to be paid by Company to Owners for all time lost, including any
         time lost owing to loss or injury to the Master, officers or crew or
         to the action of the crew in refusing to proceed to such zone or to be
         exposed to such risks.

21.3.    Any action of Owners in accordance with the provisions of this Clause
         21 shall not be deemed contrary to the instructions of Company.

22.      SECRECY

22.1.    All information regarding Company's and their clients' operation,
         investigations and findings, together with the nature and
         specification of Company's equipment installed on board the Seismic
         Vessel shall be regarded as confidential to Company and under no





                                     - 12 -
<PAGE>   13
         circumstances shall any such information be divulged to unauthorised
         persons or the Press without the prior written permission of Company.

23.      ASSIGNMENT

23.1.    The Owner's rights and obligations under this Agreement are not
         assignable or transferable in whole or in part without Company's prior
         written approval which it shall have the right to withhold.

23.2     The Company shall be entitled to assign its rights and obligations
         under this Agreement and the Side Letters, to Horizon Exploration
         Limited, any subsidiary company, associate company or sister company.

24.      TRAVEL EXPENSES

24.1.    Owner shall pay, in respect of Owner's Personnel, for the following
         travel expenses:

                 all PRC travel costs, visa expenses and subsistence, all air
                 travel to and from Houston or equivalent cost destination.

24.2.    Company shall be responsible for reasonable and agreed travel and
         subsistence costs whilst in the USA or other country of operations.

25.      OWNER'S PERSONNEL CHANGES

25.1.    Owner's Personnel shall rotate approximately every fifteen week with
         approximately fifty per cent of the personnel changing on each
         occasion, and in such a way as to minimise discontinuity of Company's
         operations.

25.2.    Company shall notify Owners 45 to 60 days in advance of the schedule
         for each crew change.

26.      COMMUNICATION COSTS

         Owner and Company shall each be responsible for their own
         communication costs. In the event Company requests Owner to make
         communications to or on behalf of Company, these shall be at Company
         cost.





                                     - 13 -
<PAGE>   14
27.      OFFENSES BY OWNERS OR COMPANY PERSONNEL

         If any personnel on or attached to the Seismic Vessel are subjected to
         fines or imprisonment in any country of operations for offenses such
         as but not limited to smuggling or drug possession/abuse then each
         Party shall be responsible for the associated expense and or fine, for
         its own personnel.

28.      SEISMIC VESSEL'S NAME/COLOURS/MARKINGS

28.1.    During this Agreement Owners shall not change the name, markings or
         colours of the Seismic Vessel without Company's permission or unless
         Company instructs Owners to do so.

29.      FORCE MAJEURE

         Any delay or failure to carry out the duties imposed upon either party
         under this Agreement shall not be deemed to be a breach thereof if
         such delay or failure results from a force majeure event beyond the
         control of the party affected.  In the event that a force majeure
         situation occurs, both parties shall promptly consult and agree a
         course of action.

30.      ARBITRATION

         Any dispute arising under this Agreement shall be referred to
         arbitration in London.  One Arbitrator to be nominated by Company and
         the other by the Owners and in case the Arbitrators shall not agree
         then to the decision of an Umpire to be appointed by them, the award
         of the Arbitrators or the Umpire to be final and binding upon both
         parties.

31.      NOTICES

31.1.    All notices due under this agreement shall be given in writing to:-

<TABLE>
<CAPTION>
      COMPANY                                            OWNERS
      --------                                           ------
      <S>                                        <C>
      Horizon Seismic Inc.                       Shanghai Bureau of Marine Geological Survey
      11200 Westheimer, Suite 200                526, Yan An Road West
      Houston                                    Shanghai, 200050
      Texas 77042                                P.R. China
      USA
      Fax No: 1-713-977-3408                     Fax No: 3294414
                                                 Telex No:  33285 MAGEO CN
      Attn: Vice President, Operations           Attn: Luo Bu Xu
</TABLE>


         All notices, requests, demands or other communications under this
         Agreement shall be in writing and be delivered personally or by
         facsimile transmission or by telex.  Such notices





                                     - 14 -
<PAGE>   15
         shall be deemed to have been received in the case of a facsimile
         transmission, at the time of dispatch with confirmation that the
         communication was well received and in the case of telex, at the time
         of dispatch with confirmed answer back, provided that in the case of
         facsimile of telex transmission, if the date of dispatch is not a
         business day in the country of the addressee, it shall be deemed to
         have been received at the opening of business on the next business
         day.


Agreed between the Parties

For Company                                        For Owner
Signed: /s/ G.M. Harrison                          Signed: /s/ Luo Bu Xu
Name: G.M Harrison                                 Name:
Position: President                                Position:
Witness: /s/                                       Witness: /s/





                                     - 15 -
<PAGE>   16
                                   SCHEDULE A

1.       MAIN DESCRIPTION

         Vessel                            "DISCOVERER"
         Flag                              Bahamas
         Built                             1980
         Converted                         1988
         Design                            MARYSTOWN
         Classification                    DNV 1A1 ICE-C
         Call Sign                         C6CZ2


2.       MEASUREMENTS

         DIMENSIONS

         Length o.a.                       72.07m (236ft)
         Breadth                           16.0m (52ft)
         Depth moulded                     6.5m (16.51ft)
         Draft                             4.7m to 5.2m
         Gross Registered Tons             1599T
         Cruising Speed                    10 knots


3.       CAPACITIES

         Fuel oil                          700 Tonnes.
         Fresh water                       350 Tonnes.
         Lube oil                          10,000 Litres


4.       LUBE OIL CONSUMPTION

         Lube Oil Consumption     150 litres per day


5.       MACHINERY

         Main Engines             MLW-ALCO 251 VIZ*2, 2740 HP EACH

         Bow thrusters            BRUNVOLL*2 600 HP EACH

         Stern thruster           BRUNVOLL*1 600 HP





                                     - 16 -
<PAGE>   17
         Main Generators                   BBC 485 KVA*3 440/220V, 60 HZ


6.       HELICOPTER DECK

         Helideck installed aft designed for BELL 212 helicopters according to
         United States regulations and in compliance with Helicopter service's
         recommendation.


7.       STABILIZATION

         Active stabilization for roll reduction.


8.       NAVIGATION AND ELECTRICAL INSTRUMENTATION

         Radar                    Sperry MK 740, Decca 10cm, Decca 3cm
         Gyro                     Robertson SKR 80(AP), SKR 82
         Autopilot
         Radio direction finder   Furuno FDK 1
         Echosounder              Furuno F851
         Magnetic Compass
         Two SSB radios           JRC JSS 201, MARCONI 3120


10.      SEISMIC EQUIPMENT

The Owners shall supply installed and insured and in good repair and operation:

         2       streamer winches each 6000 metre capacity
         2       paravane winches
         6       umbilical winches
         3       compressors & diesel/generators/motors sets
         6       gun rails with hanging brackets
         2       streamer diverters
         1       15 KVA UPS
         1       INSTRUMENT ROOM AIR CONDITIONED TO 20 degrees centigrade when
                 seismic and navigation equipment is working
         1       Schwartz laser track system
         1       sea chest, gate valve and transducer pole
         51      sleeve airguns in fully serviced and in working condition
         1       diesel driven 1100 CFM LMF Compressor
         2       electric driven 1040 CFM LMF Compressors
         1       Echosounder type Simrad EA 200 or similar





                                     - 17 -
<PAGE>   18
         1       Satellite Fax/Voice communication system type Sperry
         3       Hydraulic power-packs

         The equipment shall be available for unsupervised use by Company's
         personnel.  Maintenance, repair and consumeables for the equipment
         shall be for Company's account.


         /s/ Luo Bu Xu            /s/ G.M. Harrison

         For Owner                For Company


         One Telex
         A platform above obstructions for mounting of navigation antennae.


9.       ACCOMMODATION

         Cabin capacity: 58 Berths

         All Company accommodation fully air conditioned, to provide
         temperatures of 19 - 23 degrees centigrade during Gulf of Mexico
         Operations.

         Company accommodation comprises minimum:

<TABLE>
<CAPTION>
         No               Type             Toilet/Shower Facilities          Nominal Designation
         --               ----             ------------------------          -------------------
        <S>               <C>              <C>     <C>              <C>
         1                Suite                    Yes                       Party Manager
         1                Single                   Yes                       Assistant P.M.
         1                Double                   Yes                       Client
         1                Single                   Yes                       U.S."CAPT"
         1                Single                   No                        Obs/Mech/Nav
         4                Double                   No                        Obs/Mech/Nav
         1                Quad                     No                        Obs/Mech/Nav
         1                Double                   Yes                       Obs/Mech/Nav         
      -----                                                                  ------------
        11                                                                          20
</TABLE>





                                     - 18 -
<PAGE>   19
                                   SCHEDULE B


         SPECIAL CONDITIONS

         If any of the undermentioned events shall occur Company's liability to
         pay the Charter Fees shall be suspended in full for the duration of
         such event or events when and as often as the same shall from time to
         time occur.

         The right of Company to suspend payment of the Charter Fees during the
         occurrence of such event may be waived temporarily by the Party Chief
         on behalf of Company but cannot be permanently waived unless expressly
         agreed in writing between Company and Owners. A temporary waiver may
         be withdrawn at any time by notice from the Party Chief to the Master.
         During the period of any such waiver the full daily Charter Fees shall
         continue to be paid.


1.       ACCOMMODATION

         Failure to provide accommodation as follows:-

A.       Company accommodation to be maintained at temperatures between 19 and
         23 degrees centigrade, for a minimum of ninety per cent of each
         calendar month.

B.       Seismic Instrument Room to be maintained at 20 degrees Centigrade


2.       PROPULSION

         Failure to meet the minimum technical requirements set out below:-

A.       The Seismic Vessel shall have one of the two bow thrusters fully
         operational at all times.


3.       SPECIFIC EQUIPMENT

         Failure of any of the following specific equipment to operate as
         reasonably expected by Company or to manufacturer's specifications:-

A.       Bridge radar (both radars to be working when the Seismic Vessel leaves
         port).
 
B.       Auto pilot.

C.       Gyro compass.





                                     - 19 -
<PAGE>   20
D.       Aft deck crane.

E.       Ship's intercom

F.       VHF/M radios.


4.       GENERAL EQUIPMENT, SERVICES, CREW

A.       Any failure to meet the requirements of the appropriate Classification
         Society, flagging authority or insurance requirements.


5.       ENDURANCE

         Failure to maintain the following:-

         The Seismic Vessel shall have a potential endurance of 60 days and in
         particular shall have the following usable tank capacities:

         A.      Fuel oil tank capacity            700 tonnes.
         B.      Lube oil tank capacity            10,000 litres.
         C.      Fresh water tanker capacity       350 tonnes.


6.       ADDITIONAL

A.       Fuel, port calls and other charges accruing during the period where
         Company is not liable to pay the Charter Fees in accordance with the
         terms of this Agreement shall be charged to Owners' Account.

B.       No Charter Fees shall be payable by Company to Owners should the
         Seismic Vessel fail to maintain course/speed to Company's requirements
         due to Seismic Vessel malfunctions or operator error/deficiency.

C.       Company shall not pay to Owners the Charter Fees in respect of delays
         to the Seismic Vessel in leaving port due to the Seismic
         Vessel/personnel not being ready and any consequential delays (eg
         tides etc) provided reasonable notice shall have been given to Owners
         by Company for departure.

D.       In relation to any event where Company is relieved from its obligation
         to pay Charter Fees in accordance with this Agreement Company shall
         only be obliged to recommence payment of the Charter Fees upon
         reasonable evidence from Owners to Company that the





                                     - 20 -
<PAGE>   21
         relevant event has ceased and the Seismic Vessel is returned to an
         equally favourable position after the occurrence of such event.



/s/ G. M. Harrison                                          /s/ Luo Bu Xu
For Company                                                 For the Owners





                                     - 21 -
<PAGE>   22
                                   SCHEDULE C


The following services or functions are considered essential for the smooth
running of the Seismic Operation and failure to provide any of them is
considered a material deficiency of the Seismic Vessel, its Crew or Equipment.
The Owners therefore undertake to provide:


1.       ACCOMMODATION

A.       Owners and Company anticipate the redesignation of the lounge (rest
         area) for short periods, even if this curtails its use by the Crew.

B.       The Party Chief shall be allocated a suite in the Bridge
         accommodation.


2.       CATERING

A.       A minimum of three, varied, cooked meals per day.

B.       Access between 1900 and 0500 hours to cold and dry shores to provide
         light refreshments and meals for themselves.

C.       A steward to routinely maintain Company accommodation, showers,
         toilets and public areas in a clean and tidy condition.  All Officers
         and Crew quarters shall be kept tidy and to a similar high standard of
         cleanliness.


3.       PROPULSION

A.       The Seismic Vessel should have three working diesel generators sets at
         all times.  Any one diesel generator set may be shut down for up to
         twelve continuous hours for minor repairs and maintenance, after prior
         notice (if possible) to Company by Master.

B.       The Seismic Vessel shall have one fully operational shaft generator at
         all times.


4.       ELECTRICAL SUPPLY

A.       A domestic power supply suitable for domestic appliances and
         instrument room and work shop lighting is required, on 24 hour/day
         basis.





                                     - 22 -
<PAGE>   23
5.       PERFORMANCE

A.       The Seismic Vessel shall be capable of an average cruising speed of 10
         knots at an average fuel consumption of 11.5 tonnes, or less, per
         twenty-four hours.

B.       The Seismic Vessel shall be capable of anchoring in water depths of up
         to 100 metres.



/s/ G.M. Harrison                                         /s/ Luo Bu Xu
For the Company                                           For the Owners





                                     - 23 -
<PAGE>   24

                                        FROM:    HORIZON SEISMIC INC.
                                                 11,200 WESTHEIMER, Suite 200
                                                 HOUSTON
                                                 TEXAS 77042

                                                 April 12, 1994
To:
SHANGHAI BUREAU OF MARINE
GEOLOGICAL SURVEY
526 YAN AN ROAD WEST
SHANGHAI, 200050

Attn Mr. Luo Bu Xu

Dear Sir
                          SERVICE AGREEMENT-DISCOVERER

         This letter, to be known as Side Letter No. 1, concerns the Service
Agreement, dated April 12th, 1994, between our two Companies.

         Clause 1.2. of the above mentioned Agreement provides Horizon Seismic
Inc. with the option to extend the initial period of charter (as defined in
Clause 1.1.) for additional periods.

         In signing this Side Letter No. 1, Horizon Seismic Inc. and Shanghai
Bureau of Marine Geological Survey agree that the Charter Fees, subject to all
other conditions of the Agreement, and the exercising by Horizon Seismic of its
option to extend the initial period shall be increased after the initial twelve
months by a percentage equivalent to:

         the average of the preceding annual published retail price inflation
in the USA and the PRC subject to any increase being limited, in any event, to
a maximum of ten percent.

Yours Faithfully



G.M. Harrison
President
Horizon Seismic Inc.

Agreed on behalf of
Shanghai Bureau of Marine
Geological Survey

Luo Bu Xu
Date:  April 12, 1994
<PAGE>   25

                                         FROM:    HORIZON SEISMIC INC.
                                                  11,200 WESTHEIMER, Suite 200
                                                  HOUSTON
                                                  TEXAS 77042

                                                  April 12, 1994
To:
SHANGHAI BUREAU OF MARINE
GEOLOGICAL SURVEY
526 YAN AN ROAD WEST
SHANGHAI, 200050

Attn Mr. Luo Bu Xu

Dear Sir
                         SERVICE AGREEMENT- DISCOVERER

         This letter, to be known as Side Letter No. 2, concerns the Service
Agreement, dated April 12th, 1994, between our two companies.

         Schedule B, Clause 1.A. of the above Agreement specifies that failure
by Owners to maintain Company accommodation at temperatures between 19 and 23
degrees Centigrade, for a minimum of ninety percent of each calendar month
represents an "off-hire" condition during which Company would not be obliged to
pay the Charter Fees.

         At this date, it is understood the Owners may have difficulty in
meeting this requirement and are actively seeking to remedy the situation by
the application of additional equipment and or modification of existing
equipment.

         In signing this Side Letter No. 2, Horizon Seismic Inc. and Shanghai
Bureau of Marine Geological Survey agree; the Bureau will continue, at its
expense, to take all reasonable steps to meet the requirements of Schedule B
Clause 1A, during the period up to mobilisation and or immediately on, or after
arrival of the vessel at a US port.  Such steps shall include, if necessary,
the purchase and installation of additional equipment.

         Subject to the foregoing, Horizon agrees to temporarily waive its
right to declare the Seismic Vessel off-hire in respect of non-compliance of
this Schedule B Clause 1.A.

         No other terms of conditions of the Service Agreement are affected in
any way by this Side Letter No. 2.

Yours Faithfully



G.M. HARRISON  /s/ G.M. Harrison
PRESIDENT
HORIZON SEISMIC INC.

Agreed on behalf of
Shanghai Bureau of Marine
Geological Survey

Luo Bu Xu        /s/ Luo Bu Xu
Date:    April 12, 1994
<PAGE>   26

                                        FROM:    HORIZON SEISMIC INC.
                                                 11,200 WESTHEIMER, Suite 200
                                                 HOUSTON
                                                 TEXAS 77042

                                                 April 12, 1994
To:
SHANGHAI BUREAU OF MARINE
GEOLOGICAL SURVEY
526 YAN AN ROAD WEST
SHANGHAI, 200050

Attn Mr. Luo Bu Xu

Dear Sir
                          SERVICE AGREEMENT-DISCOVERER

         This letter, to be known as Side Letter No. 3, concerns the Service
Agreement, dated April 12th, 1994, between our two Companies.

         Clause 13 and Clause 14 of the above Agreement specify certain
liabilities, indemnities and insurances.

         In signing this Side Letter No. 3, Horizon Seismic Inc. acknowledges
and agrees that the Shanghai Bureau of Marine Geological Survey's liability to
any person on board the Seismic Vessel during the term of the Agreement, in
respect of injury of death, is limited to between thirty thousand and fifty
thousand United States Dollars.

Yours Faithfully



G.M. HARRISON  /s/ G.M. Harrison
PRESIDENT, HORIZON SEISMIC INC.

Agreed on behalf of 
Shanghai Bureau of Marine 
Geological Survey:

LUO BU XU   /s/ Luo Bu Xu
Date:     April 12, 1994
<PAGE>   27

                                         FROM:    HORIZON SEISMIC INC.
                                                  11,200 WESTHEIMER, Suite 200
                                                  HOUSTON
                                                  TEXAS 77042

                                                  April 12, 1994
To:
SHANGHAI BUREAU OF MARINE
GEOLOGICAL SURVEY
526 YAN AN ROAD WEST
SHANGHAI, 200050

Attn Mr. Luo Bu Xu

Dear Sir
                          SERVICE AGREEMENT-DISCOVERER

         This letter, to be known as Side Letter No. 4, concerns the Service
Agreement, dated April 12th, 1994, between
our two Companies.

         Clause 14 of the above Agreement specifies insurances which Owners are
required to provide for the duration of the Agreement.

         In signing this Side Letter No. 4 Horizon Seismic Inc. and Shanghai
Bureau of Marine Geological Survey acknowledge that certain Clients of Horizon
request to be named as additional or joint assured on Owners insurance
policies.  At this date Owners are unable to agree to such requests through a
policy decision of the Peoples Insurance Company of China.  The Owners and
Company agree to cooperate to resolve, if possible, the requests of Company's
Clients in this respect.

Yours Faithfully



G.M. Harrison  /s/ G. M. Harrison
President
Horizon Seismic Inc.

Agreed on behalf of Shanghai Bureau of Marine Geological Survey,
Luo Bu Xu
                 /s/ Luo Bu Xu

Date     April 12, 1994
<PAGE>   28

                                          FROM:    Horizon Seismic Inc.
                                                   11,200 Westheimer
                                                   Houston
                                                   Texas  77042
                                                   USA

                                          AND:     Horizon Exploration Ltd
                                                   6 Pembroke Road
                                                   Sevenoaks
                                                   Kent
                                                   UK

                                                   25th October 1995


To:      SHANGHAI BUREAU OF MARINE GEOLOGICAL SURVEY
         526 Yan An Road West
         Shanghai 200050
         PRC

Attn: Mr Luo BuXu


Dear Sir,

                         SERVICE AGREEMENT - DISCOVERER

         This letter, to be known as Side Letter No. 5, concerns the Service
Agreement dated April 1994 and the Protocol dated May 1995 between our
Companies.

         The Agreement and Protocol shall remain binding on Company and Owner
with this Side Letter forming an integral part thereof.  Where ambiguity arises
between this Side Letter and the Protocol or Agreement then priority in the
resolution of the ambiguity shall firstly be given to this Side Letter and
secondly to the Protocol and lastly to the Agreement.

         Company hereby gives notice to exercise Company's option to extend the
Charter period until at least 22nd March 1996, and by signing the attached
duplicate of this Side Letter, Owner acknowledges such notice.
<PAGE>   29

         Company confirms it shall advise Owner on or before January 22nd 1996
if it intends to exercise the remaining option to extend the Charter until
scheduled completion at June 22nd 1996, or if it intends to return the vessel
to Owners at 22nd March 1996.

         Company acknowledges that advance notice of Company's intentions for
the vessel are of the utmost importance to Owner for the purpose of forward
planning.  In view of this fact and the successful relationship of the parties,
Company shall endeavour to secure sufficient forward orders for the vessel such
that on or before 22nd January 1996 Company can enter negotiations with Owner
to extend the Charter beyond the expiry date for a period of 6-12 months.




Yours Faithfully,


                                  /s/ G. M. Harrison

G.M. HARRISON    President, Horizon Seismic Inc.
                 Managing Director, Horizon Exploration Ltd.



Agreed on behalf of Shanghai Bureau of Marine Geological Survey.

                 /s/ Luo Bu Xu

Luo BuXu
<PAGE>   30

23rd January 1996

HEL Ref.         GH/SS/L/868

From:    Horizon Seismic Inc.             From:    Horizon Exploration Ltd.
         11,200 Westheimer Suite 410               6 Pembroke Road
         Houston                                   Sevenoaks
         Texas 77042                               Kent
         USA                                       UK

TO:      SHANGHAI BUREAU OF MARINE GEOLOGICAL SURVEY
         526 Yan An Road West
         Shanghai 200050
         PRC

Attn:    Mr Luo BuXu

Dear Sir


                        RE: SERVICE AGREEMENT DISCOVERER

This letter, to be known as Side Letter No. 6, concerns the Service Agreement
dated April 1994 and the Protocol dated May 1995 between our Companies and the
Side Letter No. 5 dated 25th October 1995.

The Agreement and Protocol shall remain binding on Company and Owner with this
Side Letter forming at integral part thereof.  Where ambiguity arises between
this Side Letter and the Protocol or Agreement then priority in the resolution
of the ambiguity shall firstly be given to this Side Letter and secondly to the
Protocol and lastly to the Agreement.

Company hereby gives notice to exercise Company's option to extend the Charter
period until 22nd June 1996, and by signing the attached duplicate of this Side
Letter, Owner acknowledges such notice.

Yours faithfully

                          /s/ G.M. Harrison

G.M. HARRISON    President, Horizon Seismic Inc.
                 Managing Director, Horizon Exploration Ltd.

Agreed on behalf of Shanghai Bureau of Marine Geological Survey.

/s/ Luo Bu Xu
Luo BuXu
<PAGE>   31

24th January 1996

HEL Ref.         GH/SS/L/868

From:    Horizon Seismic Inc.             From:    Horizon Exploration Ltd.
         11,200 Westheimer Suite 410               6 Pembroke Road
         Houston                                   Sevenoaks
         Texas 77042                               Kent
         USA                                       UK

TO:      SHANGHAI BUREAU OF MARINE GEOLOGICAL SURVEY
         526 Yan An Road West
         Shanghai 200050
         PRC

Attn:    Mr Luo BuXu

Dear Sir

                        RE: SERVICE AGREEMENT DISCOVERER

This letter, to be known as Side Letter No. 7, concerns the Service Agreement
dated April 1994 and the Protocol dated May 1995 between our Companies and the
Side Letter No. 5 dated 25th October 1995, and the Side Letter No. 6 dated 23rd
January 1996.

The Agreement and Protocol shall remain binding on Company and Owner with this
Side Letter forming at integral part thereof. Where ambiguity arises between
this Side Letter and the Protocol or Agreement then priority in the resolution
of the ambiguity shall firstly be given to this Side Letter and secondly to the
Protocol and lastly to the Agreement.

When Company intends, in accordance with Clause 11.3 of the Agreement to reduce
Charter Payments by deduction of costs or expenses incurred by Company at the
request of and with approval or Owner. Company shall use its best endeavours to
provide original invoices supporting the deductions at the time of invoice
payment.  Yours faithfully



G.M. HARRISON    President, Horizon Seismic Inc.
                 Managing Director, Horizon Exploration Ltd.


Agreed on behalf of Shanghai Bureau of Marine Geological Survey.



Luo BuXu
<PAGE>   32

                               SERVICE AGREEMENT

                                    BETWEEN

                              HORIZON SEISMIC INC

                                      AND

                                SHANGHAI BUREAU

                                       OF

                            MARINE GEOLOGICAL SURVEY

                                   CONCERNING

                             MV DISCOVERED/FA XIAN
<PAGE>   33


                               SERVICE AGREEMENT
                                      FOR
                                 MV DISCOVERER

This Service Agreement. hereinafter referred to as the "Additional Agreement"
made effective the  24th day of January, 1996, is by and between Shanghai
Bureau of Marine Geological Survey whose address is 526 Yan An Road West,
Shanghai, Peoples Republic of China, hereinafter referred to as "Owner" as
owner of the vessel Discoverer, and Horizon Seismic Inc. whose address is 11200
Westheimer, Suite 410, Houston, Texas 77042, USA, hereinafter referred to as
"Company", as the Charterer of the vessel Discoverer.

Whereas Owner and Company entered into an Agreement dated April 12th, 1994,
together with four side letters of the same date and an Assignment to Horizon
Exploration Ltd dated 27th April, 1995 and whereas Owner and Company agreed to
exercise certain options and confirm an increase in the Charter Rate and
confirm other options in a Protocol dated May 1995 and Side Letter dated 25th
October 1995, and whereas those options were confirmed in a Side Letter dated
January 23rd 1996, all of which documents shall hereinafter be referred to as
the "Original Documents", now Owner and Company agree the following conditions:

1.       Owner and Company hereby agree a new Service Agreement - the
         Additional Agreement - in accordance with the Original Documents as
         modified below.

2.       The Original Documents shall form an integral part of the Additional
         Agreement.  Where ambiguity arises between the Additional Agreement
         and the Original Documents, then the Additional Agreement shall take
         priority in the resolution of the ambiguity.

3.       Where no modifications are made to the Original Documents they shall
         remain valid in their original form.

4.       Modifications to the Service Agreement shall be as follows:

         1.1     Owner agrees to let and Company agrees to hire the Seismic
                 Vessel, her engines, tackle, gear appurtenances and related
                 Seismic equipment, material and supplies, as specified in
                 Schedule A, collectively the "Seismic Vessel" for a period of
                 up to one year from June 22nd, 1996, in the United States Gulf
                 of Mexico Waters or other locations.

         1.2     Company shall have the option to terminate the initial period
                 early without penalty by up to three months.  The option shall
                 be exercised by Company giving sixty days notice to Owner.

                 Company shall pay Owner for the initial period at the Rates
                 defined in Clause 9 herein.  Rates for any additional period
                 of periods shall be defined in a separate agreement.
<PAGE>   34
         2.1     Charter of the Seismic Vessel by Company shall commence on
                 22nd June 1996.

         2.2     The joint survey of the Seismic Vessel undertaken by Company
                 and Owners to determine the precise condition of the Seismic
                 Vessel and its equipment, before its departure from Shanghai,
                 remains valid.

         4.3     NEW CLAUSE

                 Company shall be responsible for maintenance repair and
                 consumables for Owner supplied seismic equipment as specified
                 in Schedule A Section 10 except for expense caused through
                 Owner's negligence.

         9.1     There shall be no mobilisation fee.

         9.2     The Charter fee shall apply from June 22nd 1996 until the
                 Charter terminates in accordance with the provisions hereof
                 and subject to Clauses 15, 19 and Schedule B and other
                 relevant provisions of this Agreement and shall be at the
                 fixed daily rate of US $ 8316 - 00

         11.4    NEW CLAUSE

         In the event Company is late in paying Owner's invoices and subject to
         those invoices not being reasonably disputed, Owner shall be entitled
         to charge Company interest on any overdue and undisputed amounts at
         the rate of one percent per month.

         19.1    Notwithstanding the provisions of Clause 15 herein, Company
                 shall allow Owners one day of 24 hours per calendar month or
                 pro rata for part thereof for maintenance and/or overhaul and
                 or repairs.  During such period Company shall continue to be
                 liable to pay to Owners the Charter Fees, provided always
                 Owner has used best endeavours to minimise disruption to
                 Company operations and Owner's Master liaises fully with the
                 Party Chief.  Days can be accumulated up to a maximum of
                 twelve days but days not taken by Owners will not be
                 compensated by Company at the end of this Agreement.  Any
                 planned dry-docking and/or overhauls and/or repairs are to be
                 co-ordinated with Company but should be scheduled between 1st
                 December and 1st March each year.  Company shall, however,
                 have the right to request Owners to bring forward repairs or,
                 subject to Classification approval, delay same to be
                 co-ordinated with Company's own planned maintenance, repairs
                 and renewal.

         25.1    Owner's personnel shall rotate approximately every fifteen
                 weeks with approximately fifty per cent of the personnel
                 changing on each occasion or such alternative schedule as may
                 be mutually agreed between Owner and Company.
<PAGE>   35
         26      Communication Costs

                 Owner and Company shall each be responsible for their own
                 communication costs.  In the event Company requests Owner to
                 make communications on or behalf of Company, these shall be at
                 Company cost.

                 Company shall promptly pay its share of communications charges
                 to Shanghai Long Distance Tel Communications Office, including
                 any re-connection charges due to Company's late payment.


SCHEDULE A

         7.      The vessel does not have active stabilisation for roll
                 reduction.


Agreed between the Parties, this 24th day of January 1996:

FOR COMPANY                                FOR OWNER


Signed /s/ G.M. Harrison                   Signed /s/ Luo Bu Xu

Name G.M. Harrison                         Name  Luo Bu Xu

Position  Managing Director                Position   Division Chief

Witness   /s/                              Witness   /s/

Confirmed by Shanghai Corporation For Foreign Economic & Technological
Cooperation.

Signed    /s/

Name
    ---------------------

Position
        -----------------
<PAGE>   36
                          (x)     copies of the Bills of Sale;

                          (xi)    certificates of insurance evidencing the
                 coverages required hereunder;

                          (xii)   Uniform Commercial Code filings as deemed
                 appropriate by Secured Party's counsel duly executed by Debtor
                 and necessary third parties;

                          (xiii)  good standing certificates from the Secretary
                 of State of Debtor's state of incorporation and the state of
                 Debtor's chief executive office; and

                          (xiv)   good standing certificates from the Secretary
                 of State of Guarantor's state of incorporation and Guarantor's
                 chief executive office.

                          (xv)    UCC, tax and judgment lien searches as deemed
                 necessary or advisable by Secured Party;

                          (xvi)   the absence on the date hereof of any Liens
                 on the Collateral, other than any Permitted Encumbrance in
                 favor of Secured Party; and

                          (xvii)  Secured Party shall have received such other
                 documents, certificates,  financing statements and other
                 items, in form and substance satisfactory to Secured Party, as
                 Secured Party may request.

                 (b)      Term  Loan B Advances.  The obligation of the Secured
         Party to make Term Loan B advances after the Closing Date is subject
         to satisfaction of the following conditions:

                          (i)     delivery to the Secured Party of a Notice of
                 Borrowing;

                          (ii)    no material adverse change in the condition
                 of the Debtor (financial or otherwise) shall have occurred
                 since the Closing Date;

                          (iii)   the absence on the date of such advance of
                 any Default or Event of Default; and

                          (iv)    no Lien or other interest shall have been
                 permitted to attach to the Collateral superior or subordinate
                 to the interest of the Secured Party under this Agreement,
                 except for Permitted Encumbrances.





                                       10

<PAGE>   37
                                   ARTICLE II

                               SECURITY INTEREST

         SECTION 2.1      Grant of Security Interest.  Debtor hereby Grants to
Secured Party a first priority security interest in the following
(collectively, the items described in subsections (a)-(d) may be referred to
herein as the "Collateral"):

                 (a)      All right,  title and interest of the Debtor in and
         to the Equipment as the same is now and will hereafter be constituted,
         whether now owned by the Debtor or hereafter acquired, together with
         all accessories, equipment, parts and appurtenances appertaining or
         attached to the Equipment whether now owned or hereafter acquired, and
         all substitutions, renewals and replacements of and additions,
         improvements, accessions and accumulations to the Equipment together
         with all the rents, issues, income, profits and avails thereof.

                 (b)      All right, title, interest, claims and demands of
         Debtor in, to and under the following (collectively the "Assigned
         Agreements"):

                          (i)     the Bills of Sale;

                          (ii)    the Permitted Leases; and

                          (iii)   any and all other contracts and agreements
                 (excluding this Agreement and any supplement or modification
                 thereto and the Notes) relating to the Equipment or any rights
                 or interests therein to which Debtor is now or may hereafter
                 be a party, together with all rights, powers, privileges,
                 licenses, easements, options and other benefits of Debtor
                 under each thereof, including without limitation the right to
                 make all waivers and agreements, to give and receive all
                 notices and other instruments or communications, to take such
                 action  upon the occurrence of a default thereunder, including
                 the commencement, conduct and consummation of legal,
                 administrative or other Proceedings, as shall be permitted
                 thereby or by law, and to do any and all other things which
                 Debtor  is or may be entitled to do thereunder.

                 (c)      The proceeds from a sale or transfer of any right,
         title or interest of Debtor in the Equipment or any portion thereof.

                 (d)      All proceeds of any and all of the foregoing
         Collateral, whether now owned or hereafter acquired by Debtor and
         wherever located, including without limitation:

                          (i)     cash, accounts receivable, instruments,
                 contract rights, chattel paper, documents of title and any
                 other obligation due to Debtor with respect to or in
                 connection with the foregoing Collateral; and





                                       11

<PAGE>   38
                          (ii)    to the extent not otherwise included, all
                 payments under any  casualty insurance (whether or not Secured
                 Party is the loss payee thereof),  condemnation award,
                 indemnity, warranty or guaranty, payable by reason of loss or
                 damage to or otherwise with respect to any of the foregoing
                 Collateral.

                 The Collateral shall mean and include all personal property
         and the proceeds of such personal property described in any and all
         amendments to this Agreement hereafter executed by Debtor and Secured
         Party in connection with the Loan.

         SECTION 2.2      Security for Secured Obligations.   This Agreement
secures the payment of all indebtedness and other obligations of Debtor to
Secured Party with respect to:  the Loans, whether now or hereafter existing,
including without limitation Debtor's obligations to Secured Party under the
Notes or any other instrument and all amendments thereto and renewals and
extensions thereof, whether for principal, interest, fees, expenses or
otherwise; all of Debtor's  obligations of payment and performance now or
hereafter existing under this Agreement, including, without limitation, all
amendments hereto and renewals and extensions hereof (all such obligations of
Debtor described in this Section 2.2 being, collectively, the "Secured
Obligations").

         SECTION 2.3      Security Interest Absolute.  All rights of Secured
Party and security  interests hereunder and all Secured Obligations shall be
absolute and unconditional, irrespective of:

                 (i)      any lack of validity or enforceability of the Notes,
         this Agreement or any other Security Instrument or any other agreement
         or instrument relating thereto;

                 (ii)     any change in the time, manner, or place or payment
         of, or in any other term of, all or any of the Secured Obligations or
         any other amendment or waiver of or any consent to any departure from
         the Notes, this Agreement or any other Security  Instrument; or

                 (iii)    any exchange, release or non-perfection of any other
         collateral, or any release, amendment or waiver of or consent to
         departure from any guaranty, for all or any of the Secured
         Obligations.

                                  ARTICLE III

                   REPRESENTATIONS, WARRANTIES AND COVENANTS

         SECTION 3.1      Debtor's  Representations  and   Warranties.  Debtor
hereby represents and  warrants to Secured Party that:

                          (a)     Debtor is a corporation duly organized and
         validly existing under the laws of the State of its incorporation and
         has all requisite corporate power, authority and legal right to own
         its properties, including without limitation the Collateral, to





                                       12

<PAGE>   39
         conduct its business as is now being conducted and to execute, deliver
         and perform its obligations under the Notes, this Agreement, each
         other Security Instrument to which it is a party and each other
         document or agreement related to the Collateral to which it is a
         party.  Debtor is fully qualified to do business and is in good
         standing in each jurisdiction in which the failure to be in good
         standing would have a material adverse effect on the business or
         operations of Debtor.

                 (b)      The execution, delivery and performance by Debtor of
         the Notes, this Agreement and each other Security Instrument to which
         it is a party are within Debtor's corporate powers, have been duly
         authorized by all requisite corporate action, do not contravene
         Debtor's charter or by-laws or any law, governmental rule or
         regulation, or any order, writ, injunction, decree, determination or
         award currently in effect applicable to, or any contractual
         restriction binding on or affecting, Debtor or any of its properties,
         including without limitation the Collateral, and do not result in or
         require the creation of any Lien, security  interest, right of
         acceleration, charge or encumbrance (other than pursuant to this
         Agreement) upon or with respect to any of its properties.

                 (c)      No authorization or approval or other action by, and
         no notice to or filing (other than the filings referred to in
         subparagraph (f) below) with, any governmental authority or regulatory
         body, shareholders or any other Person is required for the due
         execution, delivery and performance by Debtor of this Agreement or any
         other Security Instrument to which it is a party.

                 (d)      The Notes, this Agreement and each other Security
         Instrument to which Debtor is a party are the legal, valid and binding
         obligations of Debtor, enforceable against Debtor in accordance with
         their respective terms, subject, in the case of enforceability, to
         applicable bankruptcy, insolvency, reorganization, moratorium and
         other laws of affecting creditors' rights generally and to the
         application of general principles of equity (regardless of whether
         such enforceability is considered in a proceeding in equity or at
         law).

                 (e)      The proceeds of the Loans will he used only to
         finance the purchase by Debtor of the Equipment; Debtor owns good and
         marketable title to the Equipment; the Collateral is free and clear of
         all Liens (except for Permitted Encumbrances in favor of Secured
         Party); and the Equipment is in good condition and ready for
         operation.  The Equipment is and will retain its character as personal
         property, and neither Debtor, Guarantor, or any Affiliate or
         Subsidiary of either Debtor or Guarantor shall affix or attach any
         item of Equipment in any manner so as to alter the character of the
         Equipment as personal property subject to the UCC.

                 (f)      The filing of Uniform Commercial Code financing
         statements in the office of the Secretary of State of the State of
         Texas will create a valid perfected first priority security interest
         in the Collateral, securing the payment of the Secured Obligations,
         and all filings and other actions necessary or desirable to perfect
         and protect such security





                                       13

<PAGE>   40
         interests will have been taken.  No Person other than Secured Party
         holds any security interest affecting the Collateral.  No effective
         Security Instrument or other instrument similar in effect covering all
         or any part of the Collateral is on file in any recording office,
         except such as may have been filed in favor of Secured Party relating
         to this Agreement.

                 (g)      Debtor's chief executive office is located in Harris
         County, Houston, Texas.  The Debtor has not used any trade names or
         other names, except for "Eagle Geophysical."

                 (h)      Contemporaneously with the execution and delivery of
         this Agreement, Debtor is delivering to Secured Party evidence of
         insurance satisfying the requirements of Section 4.1 hereof.

                 (i)      Debtor is not currently insolvent, as defined in 11
         U.S.C. 101(32) nor will it be rendered insolvent by virtue of entering
         into the Notes, this Agreement or any other Security Instrument to
         which it is a party or carrying out any of the transactions
         contemplated hereby or thereby.

                 (j)      Each financial statement of Guarantor which has been
         furnished to Secured Party fairly presents the financial condition of
         Guarantor as of the date of such financial statement.  There has been
         no material adverse change in Guarantor's financial condition since
         the date of the most current financial statement delivered to Secured
         Party.

                 (k)      There is no pending, or to the Debtor's knowledge,
         threatened, action or Proceeding affecting Debtor, Guarantor or any of
         their properties before any court, governmental agency or arbitrator
         which may materially and adversely affect the condition (financial or
         otherwise) or operations of Debtor, Guarantor or any of their
         properties or which purports to affect the validity or enforceability
         of the Notes, this Agreement or any other Security Instrument to which
         Debtor is a party.

                 (l)      No Default or Event of Default has occurred and is
         continuing.

                 (m)      All sales, transfer, use, documentation or similar
         taxes, fees or other charges due and payable prior to or as of the
         date hereof have been paid to the extent such are in connection with
         the sale to and purchase by Debtor of the Equipment.

                 (n)      Debtor is not a party to, nor bound by, any contract,
         agreement or instrument that would conflict with this Agreement, the
         Notes or any other contracts, agreements or instruments executed in
         connection with the transactions contemplated by this Agreement.

                 (o)      Debtor has agreed, and hereby acknowledges, to accept
         service of process at its address set forth in Section 8.1 hereof in
         person or by registered or certified mail





                                       14

<PAGE>   41
         return receipt requested, postage prepaid, in connection with any
         Proceeding initiated by Secured Party in any of the courts referenced
         in Section 8.11 hereof.

                 (p)      The Debtor has no Subsidiaries, except for African
         Geophysical, Inc., a corporation organized and existing under the laws
         of the Cayman Islands.

                 (q)      Debtor has not incurred any accumulated unfunded
         deficiency within the meaning of the Employee Retirement Income
         Security Act of 1974, as amended from time to time ("ERISA") nor has
         Debtor incurred any material liability to the Pension Benefit Guaranty
         Corporation ("PBGC") established under such Act (or any successor
         thereto under such Act) in connection with any Plan.  Debtor and its
         Affiliates are in compliance in all material respects with those
         provisions of ERISA and the regulations and public interpretations
         thereunder which are applicable to Debtor and its Affiliates, except
         for such noncompliance as would not have a material adverse effect on
         the financial condition of Debtor and its Affiliates, taken as a
         whole.

                 (r)      Debtor has filed all income tax returns required to
         be filed prior to the date hereof with the various governmental
         entities having taxing authority with respect to Debtor.

                 (s)      Debtor (i) is not an "investment company" as such
         term is defined in, or otherwise subject to regulations under, the
         Investment Company Act of 1940 and (ii) is not a "holding company" as
         that term is defined in, and is not otherwise subject to regulations
         under, the Public Utility Holding Company Act of 1935.

                 (t)      Debtor has not sold, extended any offer to sell nor
         accepted any offer to purchase regarding any of Debtor's interest in
         the Collateral or with respect to the transactions described in the
         Security Instruments or the Notes.

                 (u)      Debtor has delivered true and accurate copies of the
         Bills of Sale executed by Seller with respect to the transfer of the
         Equipment to Debtor.

         SECTION 3.2      Affirmative Covenants.  Until all the Secured
Obligations shall have been fully paid and satisfied, Debtor covenants and
agrees that it shall, unless Secured Party shall have otherwise consented in
writing:

                 (a)      promptly pay the principal of, interest on, and any
         other amounts due under the Notes as and when the same become due,
         whether at maturity, by acceleration or otherwise;

                 (b)      (i)  duly, punctually and faithfully perform its
         obligations under the Notes, this Agreement and each other Security
         Instrument to which it is a party; (ii) maintain the Liens and
         security interests created by this Agreement and each other Security
         Instrument to which it is a party as valid and perfected Liens on and
         security interests in all of the





                                       15

<PAGE>   42
         Collateral, prior in right to any other Lien, security interest, claim
         or other encumbrance; (iii) warrant and defend its interest in and to
         the Collateral against the claims and demands of all Persons; and (iv)
         defend, at Debtor's cost, any action, claim or Proceeding affecting
         the Collateral;

                 (c)      use the proceeds of the Loans only to finance the
         purchase by Debtor of the Equipment and maintain good and marketable
         title to the Equipment, free and clear of any Liens, security
         interests, charges or encumbrances except for the security interest
         created by this Agreement and Permitted Encumbrances;

                 (d)      notify Secured Party at least thirty (30) days prior
         to the changing of the chief executive office of the Debtor from the
         location specified in Section 3.1(g);

                 (e)      at no expense to Secured Party, cause each item of
         Equipment to be serviced, maintained and preserved in the same
         condition, repair and working order as when new, ordinary wear and
         tear excepted, and in accordance with any manufacturer's suggested or
         approved maintenance program and warranty requirements, and shall, in
         the case of any loss or damage to any item of Equipment, promptly
         furnish to Secured Party a statement respecting any such loss or
         damage and (unless an Event of Loss shall have occurred with respect
         to an item of Equipment) as quickly as practicable after the
         occurrence thereof make or cause to be made all repairs, replacements
         and other improvements in connection therewith which are necessary or
         desirable to keep each item of Equipment in proper working order;

                 (f)      permit Secured Party to inspect the Equipment during
         normal business hours upon reasonable prior notice to Debtor;

                 (g)      from time to time execute and deliver all such
         supplements and amendments hereto and to any other Security
         Instrument, and all such financing statements, continuation
         statements, instruments of further assurance and other instruments,
         and take such other action, as the Secured Party requests and
         reasonably deems necessary or advisable to:  (i) further Grant,
         maintain or preserve the Lien and security interest contemplated by
         this Agreement or carry out more effectively the purposes hereof; (ii)
         perfect or protect the validity of any Security Instrument or of any
         Grant made or to be made by this Agreement; or (iii) enforce any
         Security Instrument or preserve and defend title to the Collateral and
         the rights of the Secured Party therein against the claims of all
         Persons and parties;

                 (h)      comply with all of its representations, warranties
         and covenants set forth in this Agreement, in the Notes and each
         Security Instrument to which it is a party; and punctually perform and
         observe all of its obligations and agreements contained in this
         Agreement, in the Notes and each Security Instrument to which it is a
         party;





                                       16

<PAGE>   43
                 (i)      promptly notify the Secured Party of any default by
         any Person under any Security Instrument;

                 (j)      remain a duly organized and validly existing
         corporation under the laws of the state of its incorporation and
         remain duly qualified to do business and in good standing in each
         jurisdiction in which the failure to be in good standing would have a
         material adverse effect on the business or operations of Debtor;

                 (k)      comply in all material respects with all applicable
         laws, rules, regulations and orders; and preserve and maintain all
         federal, state and local licenses, privileges, franchises,
         certificates and other permits necessary for the operation of its
         business and the operation of each item of Equipment;

                 (l)      pay or cause to be paid promptly when due (i)
         (subject to the right of Debtor, in accordance with the provisions of
         this Agreement to obtain extensions of the date on which such taxes
         are due) all property and other taxes (including without limitation
         income, sales, use, franchise and gross receipts taxes) and
         governmental charges or levies which are at any time or from time to
         time levied upon or assessed against it or any item of Equipment or
         are otherwise associated with the ownership, use or operation of any
         item of Equipment (except such taxes levied on the net income of
         Secured Party) and (ii) all claims (including without limitation
         claims for labor, materials and supplies) against any item of
         Equipment; provided, that Debtor may contest any such tax or claim by
         appropriate Proceedings so long as such Proceedings shall suspend the
         collection thereof, no part of the Collateral would be subject to
         sale, forfeiture or diminution during the pendency of such
         Proceedings, Debtor shall have furnished such security as may be
         required in the Proceedings or reasonably requested by Secured Party,
         Debtor conducts such contests in good faith and with due diligence,
         and promptly after the final determination of each such contest,
         Debtor pays all amounts which shall be determined to be payable in
         respect thereof;

                 (m)      within 120 days after the end of each fiscal year
         furnish to the Secured Party unaudited year end financial reports of
         the Debtor including without limitation (i) a balance sheet and (ii)
         statements of income and retained earnings, all prepared in accordance
         with generally accepted accounting principles consistently applied and
         certified by the president, chief financial officer or any vice
         president of Debtor who prepared such financial statements as being
         true and accurate and fairly representing the financial condition of
         Debtor;

                 (n)      promptly report to Secured Party the commencement of
         any Proceeding against Debtor if such litigation reasonably would be
         expected to, in the event of an unfavorable outcome, cause an Event of
         Default, have a material adverse effect on Debtor's financial
         condition or operations, affect the validity or enforceability of the
         Notes, this Agreement or any of the Security Instruments or affect
         priority or enforceability of Secured Party's security interest in any
         of the Collateral;





                                       17


<PAGE>   1

                                                                   EXHIBIT 10.37

                              DATED 21 April 1997





                         PAYLESS PROPERTIES LIMITED (1)

                        HORIZON EXPLORATION LIMITED (2)




                       ---------------------------------

                              U N D E R L E A S E
                                  O F  P A R T
                                     - of -

                          Ground Floor  Suffolk House
                        154 High Street  Sevenoaks  Kent


                       ---------------------------------


               Term commences           :        21 April 1997

               Term expires             :        20 December 2011

               Initial Rent             :        L.62,100 p.a.




                                  MANCHES & CO
                                 Aldwych House
                                   81 Aldwych
                                London WC2B 4RP
                              Tel : 0171 404 4433
                                 Ref : S627/MEJ
<PAGE>   2
                                     INDEX

1. DEFINITIONS

2. DEMISE

3. TENANT'S COVENANTS

         3.1 To pay rents
         3.2 To pay rates and taxes
         3.3 To pay interest
         3.4 To pay Value Added Tax
         3.5 To pay for all electricity water and other services
         3.6 To pay Landlord's costs of abating a nuisance
         3.7 To pay costs
         3.8 To pay service charge
         3.9 To repair interior
         3.10 To clean windows
         3.11 To paint interior
         3.12 To comply with all statutes
         3.13 To deliver up
         3.14 To permit entry to view state of repair
         3.15 To permit entry for repairs or to carry out works
         3.16 To permit Landlord to obstruct lights and easements
         3.17 To permit works on adjoining premises
         3.18 Not to make alterations and additions
         3.19 Not to set up engines or machinery
         3.20 Not to exhibit any sign without approval
         3.21 Not to hang goods
         3.22 Prohibited activities
         3.23 User
         3.24 Not to obstruct windows or permit encroachments
         3.25 Not to obstruct sewers drains or watercourses
         3.26 Refuse
         3.27 Weights
         3.28 Electrical supplies
         3.29 The Planning Acts
         3.30 Alienation
         3.31 Notice of Dealings
         3.32 To permit persons to view
         3.33 Notice to Landlords
         3.34 Indemnity
         3.35 Insurance
         3.36 Death of Surety
<PAGE>   3
         3.37 Defective Premises Act 1972
         3.38 Regulations
         3.39 Information
         3.40 Superior Lease
         3.41 Documents in Part III of Second Schedule
         3.42 Keyholders

4. LANDLORD'S COVENANTS

         4.1 Quiet Enjoyment
         4.2 In  surance
         4.3 Repair and Maintenance
         4.4 Superior Lease Rents
         4.5 Superior Lease Covenants

5. PROVISOS

         5.1 Proviso for re-entry
         5.2 Suspension of rent
         5.3 Notices
         5.4 Compensation
         5.5 Neighbouring development
         5.6 Exclusion of implied easements
         5.7 Continuation of obligations
         5.8 Damages
         5.9 Waiver and Interest
         5.10 User Warranty
         5.11 Right to distrain
         5.12 Disputes
         5.13 Value Added Tax
         5.14 Commission
         5.15 Landlord's liability
         5.16 Tenant's goods
         5.17 Party Structures
         5.18 Exclusion of representations
         5.19 Jurisdiction
         5.20 Headings
         5.21 Break Clause
         5.22 Court Order
         5.23 Superior Lease
         5.24 New Lease
<PAGE>   4
THE FIRST SCHEDULE - the Demised Premises

THE SECOND SCHEDULE - rights, exceptions and reservations

THE THIRD SCHEDULE - rent review

THE FOURTH SCHEDULE - Service Charge
<PAGE>   5
T H I S   U N D E R L E A S E made the 21 day of April One thousand nine
hundred and ninety-seven

B E T W E E N PAYLESS PROPERTIES LIMITED (Company Number 543407) whose
registered office is at 1 Thane Road West Nottingham NG2 3AA (hereinafter
called "the Landlord") of the one part and HORIZON EXPLORATION LIMITED (Company
Number 2804983) whose registered office is at 6 Pembroke Road Sevenoaks Kent
(hereinafter called "the Tenant") of the other part


W I T N E S S E T H as follows:

1. DEFINITIONS

         1.1     IN this Deed unless there be something in the subject or
                 context inconsistent therewith the following expressions shall
                 have the following meanings

                 1.1.1    "the Landlord" shall include its successors in title
                          and the reversioners for the time being immediately
                          expectant on the determination of the Term

                 1.1.2    "the Tenant" shall include its successors in title

                 1.1.3    "these Presents" shall mean this Deed and the
                          Schedules hereto any license granted pursuant hereto
                          any Deed of Variation of the provisions hereof and
                          any instrument made supplemental hereto

                 1.1.4    "the Demised Premises" shall mean the whole and every
                          part of the premises described in the First Schedule
                          hereto and any alterations or additions to the said
                          premises together with all fixtures and fittings in
                          the nature of landlord's fixtures and fittings and
                          plant and machinery and electrical and other service
                          installations which are now or at any time hereafter
                          may be affixed to or upon the said premises

                 1.1.5    "the Building" means the building situate at and
                          known as Suffolk House 154 High Street Sevenoaks Kent

                 1.1.6    "the Term" shall mean the term hereby granted

                 1.1.7    "the Insured Risks" shall mean fire and such other
                          insurable risks (including if the Landlord or the
                          Superior Landlord so requires property owners and
                          third party liability insurance) as the Landlord or
                          the Superior Landlord in their absolute discretion
                          may from time to time insure against subject to such
                          exclusions and limitations as may be imposed by the





                                       s1
<PAGE>   6
Insurers or agreed between the Landlord or the Superior Landlord and the
Insurers pursuant to the provisions of the Superior Lease

                 1.1.8    "the Planning Acts" shall mean the Town and Country
                          Planning Act 1990 the Planning (Listed Buildings and
                          Conservation Areas) Act 1990 the Planning (Hazardous
                          Substances) Act 1990 the Planning (Consequential
                          Provisions) Act 1990 and the Planning and
                          Compensation Act 1991 and all other legislation for
                          the time being relating to Town and Country Planning
                          or to development control and any regulations rules
                          orders instruments plans permissions or directions
                          made under any of the foregoing

                 1.1.9    "the Superior Lease means the lease dated 26 February
                          1987 made between M & G Life Assurance Company
                          Limited (1) Payless D.I.Y. Limited (2) and Ward White
                          Retail (U.K.) Limited (3) under which the Landlord
                          holds the Building

                 1.1.10   "the Superior Landlord" means the person or persons
                          for the time being entitled to the reversion
                          mediately or immediately expectant on the
                          determination of the Superior Lease

         1.2     This lease shall unless the context otherwise requires be
                 construed on the basis that:

                 1.2.1    where two or more persons are respectively included
                          in the expressions "the Landlord" "the Tenant" and
                          "the Surety" the covenants expressed to be made by
                          the Landlord the Tenant and the Surety respectively
                          shall be deemed to be made by such persons jointly
                          and severally

                 1.2.2    covenants and obligations made or assumed by any
                          party shall be binding on and enforceable against his
                          personal representatives

                 1.2.3    words importing the singular shall include the plural
                          and vice versa and words importing the masculine
                          shall include the feminine and vice versa and where a
                          party hereto is a corporate body any personal pronoun
                          or possessive adjective used in these Presents shall
                          be construed as an inanimate one

                 1.2.4    any reference to the doing or permitting of any act
                          or thing by the Landlord shall be deemed to include
                          the doing or permitting of that act or thing by the
                          agents workmen servants or other employees or agents
                          of or any contractor engaged by the Landlord and/or
                          any Superior Landlord and/or any mortgagee





                                       2
<PAGE>   7
                 1.2.5    any covenant by the Tenant not to do any act or thing
                          shall be deemed to include a covenant not to suffer
                          or permit the doing of that act or thing and to use
                          its best endeavours to prevent such act or thing done
                          by a third party and any positive covenant by the
                          Tenant shall be deemed to include a covenant to
                          procure that the act or thing in question be done

                 1.2.6    all rights reservations permissions and indemnities
                          in favour of the Landlord shall also be for the
                          benefit of any Superior Landlords and any mortgagee
                          to the intent that any Superior Landlords and/or
                          mortgagees shall be entitled to exercise or have the
                          benefit of the same in addition to the Landlord

                 1.2.7    where the consent permission approval or the like of
                          the Landlord is required under any covenant or
                          condition herein contained the same covenant or
                          condition shall be subject to the consent of any
                          Superior Landlords or Mortgagees (if so required) to
                          the intent that the consent of any Superior Landlords
                          and/or Mortgagees shall be a condition precedent to
                          the grant by the Landlord of any consent permission
                          approval or the like (but nothing herein implies that
                          any obligation is imposed upon any Superior Landlords
                          and/or Mortgagees not unreasonably to withhold any
                          such consent) and that the Landlord may require the
                          Tenant to discharge the costs charges and expenses of
                          any Superior Landlords or Mortgagees in respect
                          thereof whether or not the same be proceeded with or
                          acted upon

                 1.2.8    any reference to any statute or any section of any
                          statute shall be deemed to include any amendment
                          modification consolidation or re-enactment thereof
                          and any statutory instrument regulation rules orders
                          or directions made thereunder for the time being in
                          force and any general reference to statute or
                          statutes includes any statutory instrument
                          regulations rules orders or directions made
                          thereunder and any directives or other legislation of
                          the European Community that is directly applicable to
                          England and Wales

                 1.2.9    Any provisions in these Presents conferring an
                          indemnity in favour of the Landlord or imposing an
                          obligation to repay to the Landlord any payment made
                          or expense incurred shall be construed as conferring
                          such indemnity or extending such obligation to repay
                          to any Superior Landlords and/or Mortgagees

                 1.2.10   References to the last year of the Term include the
                          last year of the Term if it determines otherwise than
                          by effluxion of time and references to the end of the
                          Term include any sooner determination of the Term





                                       3
<PAGE>   8
2.       DEMISE

         2.1     IN consideration of the rents hereby reserved and of the
                 covenants by the Tenant hereinafter contained the Landlord
                 HEREBY DEMISES unto the Tenant ALL THOSE the Demised Premises
                 TOGETHER WITH the rights and benefits (if any) specified in
                 Part I of the Second Schedule hereto BUT SUBJECT TO (and where
                 appropriate with the benefit of) the exceptions reservations
                 and other matters (if any) specified in Parts II and III of
                 the Second Schedule hereto which are hereby excepted out of
                 this demise and reserved unto the Landlord and all others
                 authorised by the Landlord and the owners and occupiers of any
                 adjoining or neighbouring premises and/or to which the Demised
                 Premises is or may be subject TO HOLD the same (except and
                 reserved and subject as aforesaid) UNTO the Tenant for a term
                 commencing on the 21st day of April, 1997 and expiring on the
                 20 day of December 2011 YIELDING AND PAYING therefor yearly
                 (and so in proportion for any part of a year) during the Term
                 the rents as set forth in the Third Schedule hereto (exclusive
                 of any Value Added Tax (or similar tax whether in substitution
                 for or in addition to it) charged pursuant to Clause 5.13
                 hereof or otherwise) by equal quarterly payments in advance on
                 the usual quarter days in each year (namely on the 25th March
                 24th June 29th September and 25th December) without any
                 deduction or set off whatsoever the first of such payments to
                 be made on the 21st day of April 1997 for the period from the
                 21st day of April 1997 to the 23rd day of June 1997 AND ALSO
                 YIELDING AND PAYING by way of additional rent from time to
                 time such sum or sums as shall be equal to:

                 2.1.1    the amounts which the Landlord may expend (by payment
                          to the Superior Landlord pursuant to the provisions
                          of the Superior Lease or otherwise) in effecting or
                          maintaining or procuring an insurance of the Demised
                          Premises (including any increased premium payable by
                          reason of any act or omission by the Tenant any
                          sub-tenant or their respective servants agents
                          licensees or invitees) for the full reinstatement
                          value thereof (together with professional fees
                          demolition and site clearance fees) against the
                          Insured Risks and in the event that such insurance is
                          attributable to other premises in addition to the
                          Demised Premises to pay such proportion of such sum
                          or sums as are attributable to the Demised Premises
                          as shall be determined by the Landlord whose decision
                          shall be binding on the Tenant and

                 2.1.2    the amounts which the Landlord may expend in
                          effecting or maintaining insurance against four
                          years' loss of rent hereunder in respect of the
                          Demised Premises (including any likely increase in
                          rent following a review of rent in accordance with
                          the Third Schedule hereto)





                                       4
<PAGE>   9
                 2.1.3    any Value Added Tax payable by the Tenant pursuant to
                          the terms of these Presents

         such additional rent to be paid on demand therefor by the Landlord

3.       TENANT'S COVENANTS

         THE Tenant HEREBY COVENANTS with the Landlord as follows

         To pay rents

         3.1     To pay (by bankers standing order if the Landlord so requires)
                 the said rents at the times and in the manner at and in which
                 the same are hereinbefore reserved and made payable without
                 any deduction counterclaim or set off whatsoever

         To pay rates and taxes

                 3.2.1    To pay and discharge all rates taxes duties charges
                          assessments impositions and outgoings whatsoever
                          (whether parliamentary parochial local or of any
                          other description and whether or not of a capital or
                          non-recurring nature) which are now or may at any
                          time hereafter be taxed assessed charged or imposed
                          upon or payable in respect of the Demised Premises or
                          any part thereof or on the owners or occupiers
                          thereof (save for such payment as shall be occasioned
                          by any disposition of or dealing with any estate or
                          interest expectant in reversion on the Term) and in
                          the event that such rates taxes duties charges
                          assessments impositions and outgoings are
                          attributable to other premises of the Landlord in
                          addition to the Demised Premises to pay to the
                          Landlord on demand by way of additional rent such
                          proportion of such rates taxes duties charges
                          assessments impositions and outgoings as are
                          attributable to the Demised Premises as shall be
                          determined by the Landlord whose decision shall be
                          binding on the Tenant

                 3.2.2    If the Landlord shall suffer any loss of rating
                          relief which may be applicable to empty premises
                          following the expiration of the Term by reason of
                          such relief being allowed to the Tenant or any
                          permitted sub-tenant in respect of any period prior
                          to the expiration of the Term to make good such loss
                          to the Landlord forthwith on demand being made
                          therefor

                 3.2.3    Not to agree or by default to allow to be fixed the
                          rateable value of the Demised Premises or any part
                          thereof without the prior written consent of the
                          Landlord and to co-operate with the Landlord in any
                          negotiations with the District Valuer or in respect
                          of any appeal to the Court or to the Lands Tribunal
                          regarding the rateable value of the Demised Premises





                                       5
<PAGE>   10
         Interest

         3.3     To pay to the Landlord interest (as well before as after any
                 judgement) at the rate of four per cent per annum above either
                 Lloyds Bank PLC Base Rate for the time being or such other
                 designated rate of interest as shall be substituted therefor
                 by Lloyds Bank PLC and in force at the date of commencement of
                 the period in respect of which any payment of interest accrues
                 due under these Presents on any rents and other sums due
                 hereunder in arrear and unpaid after the same shall become
                 properly due from the date such rents or other sums become due
                 to the date of payment thereof PROVIDED THAT this covenant
                 shall be without prejudice to the Landlord's right of re-entry
                 under the provisions of Clause 5.1 hereof

         To Pay Value Added Tax

                 3.4.1    To pay to the Landlord and to indemnify the Landlord
                          against all Value Added Tax (or any tax of a similar
                          nature that may be substituted for it or levied in
                          addition to it) on all taxable supplies received by
                          the Tenant under or in connection with these Presents
                          or in respect of any payment made by the Landlord
                          where the Tenant agrees in these Presents to
                          reimburse the Landlord for such payment

                 3.4.2    In every case where the Tenant covenants to pay an
                          amount of money under these Presents such amount
                          shall be regarded as being exclusive of all Value
                          Added Tax (or similar tax as aforesaid) which may
                          from time to time be legally payable thereon

                 3.4.3    For the avoidance of doubt the Landlord is under no
                          duty to make or not to make any election or exercise
                          or not exercise any right conferred on it by the
                          statutes relating to Value Added Tax (or similar tax
                          as aforesaid) so as to reduce or avoid any liability
                          thereto referred to above and the Tenant hereby
                          irrevocably consents to the Landlord freely
                          exercising such election or right to the extent from
                          time to time permitted by law

                 3.4.4    The Tenant hereby warrants that it will after
                          completion of this Lease use the Demised Premises in
                          the course of a business carried on by it solely for
                          making supplies which would entitle the Tenant to a
                          credit in full for input tax attributable to those
                          supplies and that it will satisfy any similar or
                          additional test introduced in the Finance Act 1997 or
                          elsewhere in order to enable each supply occurring on
                          every rent payment date to be standard rated for VAT
                          purposes and any sale of the reversion to the Demised
                          Premises by the Landlord to be standard rated for VAT
                          purposes and that it will indemnify the Landlord
                          against all losses, costs and expenses arising from a
                          breach of this warranty including without prejudice
                          to the generality





                                       6
<PAGE>   11
                          of the foregoing any input tax relating to the
                          Demised Premises for which it fails to obtain credit
                          as a result of the breach

         To pay for all electricity water and other services

         3.5     To pay and discharge and indemnify the Landlord against all
                 charges for electricity water gas telecommunications and other
                 services supplied to or consumed in the Demised Premises and
                 the meter rents in connection therewith and to observe and
                 perform all regulations and requirements of the suppliers and
                 supply authorities in respect of the Demised Premises

         To pay Landlord's costs of abating a nuisance

         3.6     From time to time to pay all costs charges and expenses
                 properly incurred by the Landlord in abating any nuisance at
                 or arising from the Demised Premises and executing all such
                 works as may be necessary for abating such a nuisance whether
                 or not in obedience to a notice served by a local or other
                 competent authority

         To pay costs

         3.7     To pay to the Landlord on demand on a full indemnity basis all
                 costs charges fees disbursements and expenses (including legal
                 costs surveyors fees other professional fees and disbursements
                 and commission payable to a bailiff) which may be properly
                 incurred by the Landlord:

                 3.7.1    in or in contemplation of any proceedings under
                          Sections 146 and/or 147 of the Law of Property Act
                          1925 notwithstanding forfeiture is avoided otherwise
                          than by relief granted by the Court

                 3.7.2    in contemplation of or incidental to the preparation
                          and service of a Schedule of Dilapidations during the
                          Term or following the determination thereof

                 3.7.3    in connection with or in contemplation of the
                          preparation and service on the Tenant of any notice
                          (whether statutory or otherwise) and including the
                          preparation of any schedule to accompany such notice
                          in relation to any breach of any covenant by the
                          Tenant

                 3.7.4    in the supervision or superintendence of any works to
                          be carried out pursuant to any Notice and/or Schedule
                          of Dilapidations whether or not such works shall be
                          carried out during or after the determination of the
                          Term





                                       7
<PAGE>   12
                 3.7.5    incidental to the recovery of rent or other monies
                          due and payable hereunder or to the remedying of any
                          breach of covenant on the part of the Tenant herein
                          contained

                 3.7.6    in valuations of the Demised Premises for insurance
                          purposes

                 3.7.7    in the assessment of the rateable value of the
                          Demised Premises or any part thereof including any
                          negotiations with the District Valuer and any appeal
                          to the Court or to the Lands Tribunal

                 3.7.8    resulting from all applications by the Tenant for any
                          consent of the Landlord and/or any Superior Landlord
                          together with those of any Superior Landlord and any
                          stamp duty on licenses and counterparts including
                          legal charges and Architects and Surveyors fees
                          actually incurred in cases where consent is refused
                          or the application is withdrawn and in relation to
                          any of the above matters the Landlord is entitled to
                          charge a reasonable fee for any work done by the
                          Landlord itself by any associated or subsidiary
                          company of the Landlord or by their employees
                          PROVIDED THAT the Tenant shall be under no
                          obligations to indemnify the Landlord against any
                          such costs and/or expenses if as a result of
                          litigation or arbitration no order for costs in
                          favour of the Landlord is made

         To pay service charge

         3.8     To pay to the Landlord without any deduction by way of
                 additional rent a proper proportion of the expenses and
                 outgoings incurred by the Landlord under the heads of
                 expenditure and in the provision of services set out in the
                 Fourth Schedule hereto such additional rent (hereinafter
                 called "the service charge") being subject to the following
                 terms and provisions:

                 3.8.1    the proper proportion before mentioned shall be
                          determined by the Landlord and may be varied from
                          time to time and may be a different proportion of
                          different items of such expenses and outgoings
                          dependent upon the situation area and use of the
                          Demised Premises and the said services

                 3.8.2    the amount of the service charge shall be ascertained
                          and certified annually by a Certificate (hereinafter
                          called "the Certificate") signed by or on behalf of
                          the Landlord so soon after the end of the Landlord's
                          Financial Year as may be practicable and shall relate
                          to such year in manner hereinafter mentioned

                 3.8.3    the expression "the Landlord's Financial Year" shall
                          mean the period from the 1 day of March every year to
                          the 28 day of February of the year





                                       8
<PAGE>   13
                          following or such other annual period as the Landlord
                          may in its discretion from time to time determine as
                          being that in which the accounts of the Landlord
                          either generally or relating to the service charge
                          shall be made up

                 3.8.4    A copy of the Certificate for such Landlord's
                          Financial Year shall be supplied by the Landlord to
                          the Tenant on written request without charge to the
                          Tenant

                 3.8.5    the Certificate shall contain a fair summary of the
                          Landlord's said expenses and outgoings incurred by
                          the Landlord during the Landlord's Financial Year to
                          which it relates and the Certificate (or a copy
                          thereof duly certified by the person by whom the same
                          was given) shall be conclusive evidence for the
                          purposes hereof of the matters of fact which it
                          purports to certify

                 3.8.6    the expression the expenses and outgoings incurred by
                          the Landlord as hereinbefore used shall be deemed to
                          include not only those expenses and outgoings
                          hereinbefore described which have been actually
                          disbursed or incurred by the Landlord during the
                          Landlord's Financial Year in question but also such
                          reasonable part of all such expenses and outgoings
                          hereinbefore described which are of a periodically
                          recurring nature (whether recurring by regular period
                          or not) whenever disbursed or incurred and whether
                          prior to the commencement of the Term or otherwise as
                          the Landlord may in its discretion allocate to the
                          year in question as being fair and reasonable in the
                          circumstances (including a sum or sums of money by
                          way of provision for anticipated expenditure in
                          respect thereof)

                 3.8.7    on each of the usual quarter days in every year
                          during the Term (namely on 25th March, 24th June,
                          29th September and 25th December) the Tenant shall
                          pay to the Landlord in advance one quarter of such
                          sum (hereinafter referred to as "the advance
                          payment") in advance and on account of the service
                          charge for the Landlord's Financial Year current at
                          such date as the Landlord shall from time to time
                          specify at its discretion to be fair and reasonable

                 3.8.8    As soon as practicable after the end of each
                          Landlord's Financial Year the Landlord shall furnish
                          to the Tenant an account of the service charge
                          payable by the Tenant for the Landlord's Financial
                          Year due credit being given therein for the advance
                          payment made by the Tenant in respect of the
                          Landlord's Financial Year and upon the furnishing of
                          such account there shall be paid by the Tenant to the
                          Landlord the service charge or any balance found
                          payable or there shall be allowed by the Landlord to
                          the Tenant against any future payments of the service
                          charge any amount





                                       9
<PAGE>   14
                          which may have been overpaid by the Tenant by way of
                          advance payments as the case may require PROVIDED
                          ALWAYS that the provisions of this sub-clause shall
                          continue to apply notwithstanding the expiration or
                          sooner determination of the Term but only in respect
                          of the period down to such expiration or sooner
                          determination as aforesaid

         To repair interior

         3.9     To repair renew replace and throughout the Term (whether or
                 not the Landlord has served notice requiring the Tenant so to
                 do) to keep the whole of the Demised Premises and every part
                 thereof including (without prejudice to the generality of the
                 foregoing) all drains soil and other pipes sewers sanitary and
                 water apparatus plate glass plant machinery heating and air
                 conditioning apparatus and appurtenances of whatsoever nature
                 belonging to the Demised Premises in good and substantial
                 repair and condition in every respect (damage by any of the
                 Insured Risks excepted unless the policy or policies of
                 insurance shall be vitiated or payment of the policy monies
                 shall be refused in whole or in part in consequence of any act
                 neglect default or omission of the Tenant or any sub-tenant or
                 their respective servants agents licensees or invitees) and
                 forthwith to notify the Landlord in writing with full
                 particulars of any defect or want of repair in respect of
                 which the Landlord may have a liability or a duty of care
                 under these Presents the Defective Premises Act 1972 or
                 otherwise

         To clean windows

         3.10    To clean all windows in the Demised Premises both inside and
                 out at least once in every month during the Term

         To paint interior

                 3.11.1   As often as may be necessary and in any event not
                          less than once in every five years calculated from 25
                          December 1986 and also in the last six months of the
                          Term (howsoever terminating) to prepare and paint in
                          a proper and workmanlike manner all the inside wood
                          and iron and other work usually painted of the
                          Demised Premises with two coats at least of good
                          quality and suitable paint and to wash down all
                          washable surfaces and to prepare and treat suitably
                          having regard to its nature (whether by varnishing
                          french polishing or otherwise) all internal woodwork
                          of the Demised Premises AND ALSO with every such
                          internal painting to whitewash colourwash grain
                          varnish paper and otherwise decorate or treat in a
                          proper and workmanlike manner all such internal parts
                          of the Demised Premises as have been or ought
                          properly to be so treated





                                       10
<PAGE>   15
                 3.11.2   In the last six months of the Term the tints colours
                          and patterns of all such works of decoration shall be
                          such as shall be approved by the Landlord

                 3.11.3   To carry out all work required to be carried out
                          under the terms of these Presents using good quality
                          and suitable materials and in accordance with good
                          modern practice from time to time

         To comply with all statutes

                 3.12.1   At all times during the Term to observe and comply in
                          all respects with the provisions and requirements of
                          any and every enactment (which expression in this
                          covenant includes any and every Act of Parliament
                          already or hereafter to be passed and any and every
                          order regulation and bye-law already or hereafter to
                          be made under or in pursuance of any such Act) so far
                          as they relate to or affect the Demised Premises or
                          any part thereof or the user thereof or the
                          employment therein of any person or any fixtures
                          machinery plant or chattels for the time being
                          affixed thereto or which are therein or used for the
                          purposes thereof and whether required to be observed
                          or complied with by the landlord or tenant or owner
                          or occupier thereof and to indemnify the Landlord at
                          all times against all claims costs charges and
                          expenses in respect thereof and not at any time
                          during the Term to do or omit in on or about the
                          Demised Premises any act or thing by reason of which
                          the Landlord may under any enactment incur or have
                          imposed upon it or become liable to pay any penalty
                          damages compensation costs charges or expenses

                 3.12.2   To keep the Demised Premises and all parts of it in
                          such state and condition that it may satisfactorily
                          be used and continue in the immediate future to be
                          used for its intended purpose with an appropriate
                          degree of convenience and comfort for the occupants.

                 3.12.3   To comply with all requirements and recommendations
                          from time to time of the insurers of the Demised
                          Premises and of the appropriate authority in relation
                          to fire precautions affecting the Demised Premises

                 3.12.4   Not to obstruct the access to or means of working of
                          any fire alarm smoke detection fire fighting and
                          extinguishing appliances and equipment or the means
                          of escape from the Demised Premises in case of fire
                          or other emergency

                 3.12.5   Not to store or use any dangerous explosive or
                          inflammable oils or substances on or in the Demised
                          Premises

         To deliver up





                                       11
<PAGE>   16
         3.13    At the expiration or sooner determination of the Term quietly
                 to yield up unto the Landlord the Demised Premises in such
                 state and condition as shall in all respects be consistent
                 with a full and due performance by the Tenant of the covenants
                 on the Tenant's part herein contained (except the Tenant's
                 trade or other fixtures and signs which the Tenant shall
                 remove the Tenant forthwith making good all damage caused to
                 the Demised Premises by such removal) and to give up all keys
                 of the Demised Premises to the Landlord AND IF at the end of
                 the Term the Demised Premises are not in such state and
                 condition as aforesaid then (unless the Landlord has exercised
                 its option under Clause 5.8 hereof) the Landlord shall be
                 entitled to require the Tenant to pay to the Landlord on
                 demand by way of liquidated damages (which the Tenant hereby
                 covenants forthwith to do) the sum certified by the Landlord's
                 surveyor as being equal to the cost of putting the Demised
                 Premises into such state and condition (including without
                 limitation all professional fees properly incurred) and the
                 rent firstly hereby reserved that would have been payable if
                 the Term had been extended for such period as would be
                 reasonably necessary to put the Demised Premises into that
                 state and condition

         To permit entry to view state of repair

         3.14    To permit the Landlord at all reasonable times and as often as
                 may be necessary in every year at reasonable times on giving
                 prior notice to enter into and upon the Demised Premises and
                 examine the state of repair and condition of the same and/or
                 to take schedules or inventories of the Landlord's fixtures
                 fittings plant machinery and equipment thereon and to ensure
                 that nothing has been done or omitted to be done therein or
                 thereon which constitutes or may in the reasonable opinion of
                 the Landlord tend to constitute a breach of any of the
                 covenants or other matters contained in these Presents and
                 within two calendar months or sooner if requisite after notice
                 in writing to the Tenant shall have been given or left at the
                 Demised Premises of all defects and wants of repair found on
                 such examination to repair and make good the same according to
                 such notice and the covenants in that behalf hereinbefore
                 contained and in case the Tenant shall make default in so
                 doing it shall be lawful for the Landlord (without prejudice
                 to the right of re-entry hereinafter referred to) to enter
                 upon the Demised Premises with all necessary workmen tools
                 materials equipment and appliances and repair and restore the
                 same and all expenses properly incurred thereby shall on
                 demand be paid by the Tenant to the Landlord and if not so
                 paid shall be recoverable by the Landlord as rent in arrear
                 AND the Tenant hereby irrevocably appoints the Landlord to be
                 the agent of the Tenant throughout the Term for the purpose of
                 entering on inspecting and viewing the condition of any parts
                 of the Demised Premises not at the time of such inspection in
                 the occupation of the Tenant

         To permit entry for repairs or to carry out works





                                       12
<PAGE>   17
         3.15    To permit the Landlord and the tenants and occupiers of any
                 adjoining or neighbouring premises now or at any time
                 hereafter belonging to the Landlord or any Superior Landlords
                 with tools and apparatus at any reasonable time or times
                 during the Term upon giving reasonable notice (except in the
                 case of emergency) to enter upon the Demised Premises

                 3.15.1   for the purpose of executing repairs alterations or
                          other works to or upon such adjoining or neighbouring
                          premises and

                 3.15.2   for the purpose of constructing laying down altering
                          repairing cleansing emptying or maintaining any
                          conduits pipes drains channels watercourses sewers
                          wires and cables in connection with or for the
                          accommodation of any such adjoining or neighbouring
                          premises and

                 3.15.3   for any other necessary or reasonable purpose
                          whatsoever including (in the case of the Landlord)
                          any purpose that the Landlord deems necessary in
                          order to enable the Landlord to comply with its
                          covenants under the Superior Lease notwithstanding
                          that the obligation to perform or comply with such
                          covenant may be imposed on the Tenant by this Lease

                 the person or persons exercising such right of entry making
                 good to the Tenant all damage thereby occasioned to the
                 Demised Premises

         To permit Landlord to obstruct lights and easements

         3.16    To permit the Landlord at any time during the Term to erect or
                 rebuild or alter any buildings or erections facing adjoining
                 or near to the Demised Premises to any extent and in any
                 manner the Landlord may think fit notwithstanding that the
                 building so erected rebuilt or altered may obstruct or
                 interfere with the access of light or air for the time being
                 to or enjoyed with the Demised Premises or any part thereof or
                 any buildings for the time being thereon

         To permit works on adjoining premises

         3.17    Not to make any objection to or claim in respect of any works
                 of construction building alteration addition or repair carried
                 out upon any land or property adjoining or near any part of
                 the Demised Premises by the Landlord or any Superior Landlords
                 or any persons authorised by either of them or by the tenants
                 and occupiers of such land or property

         Not to make alterations and additions

                 3.18.1   Not to erect any new buildings on or make any
                          additions or alterations to the Demised Premises or
                          to cut maim remove or damage any of the walls





                                       13
<PAGE>   18
                          timbers floors or ceilings of the Demised Premises or
                          make any communication into or with any adjacent
                          building or property PROVIDED THAT:

                          3.18.1.1         the Tenant may with the prior
                                           written consent of the Landlord make
                                           any internal non-structural
                                           additions or alterations to the
                                           Demised Premises in accordance with
                                           plans and specifications approved by
                                           the Landlord (such consent and
                                           approval not to be unreasonably
                                           withheld or delayed in the case of a
                                           proposed internal non-structural
                                           alteration which in the reasonable
                                           opinion of the Landlord does not
                                           reduce the value of the Landlord's
                                           reversionary interest in the Demised
                                           Premises) and

                          3.18.1.2         in the event of the Landlord giving
                                           consent to the carrying out of any
                                           additions or alterations whatsoever
                                           to the Demised Premises the Tenant
                                           will at the end or sooner
                                           determination of the Term if so
                                           required by the Landlord reinstate
                                           the Demised Premises to their former
                                           state and condition before the
                                           carrying out of such alterations or
                                           additions and to the reasonable
                                           satisfaction in all respects of the
                                           Landlord

                 3.18.2   Without prejudice to the generality of the foregoing
                          not to make or permit or suffer to be made any
                          alteration or addition to any electrical installation
                          in or on the Demised Premises except in accordance
                          with the terms and conditions laid down by the
                          Institution of Electrical Engineers and the
                          regulations of the relevant electricity supply
                          company

         Not to set up engines or machinery

         3.19    Not without the prior written consent of the Landlord to set
                 up any fire or stove steam or other engine or any machinery in
                 or upon the Demised Premises

         Not to exhibit any sign without approval

         3.20    Not to exhibit on any part of the exterior of the Demised
                 Premises or upon or in any part of the interior of the Demised
                 Premises so as to be visible from the exterior any sign notice
                 signboard poster advertisement or other structure or equipment
                 except such as shall have been previously approved in writing
                 by the Landlord such approval not to be unreasonably withheld
                 or delayed in addition to any permission required by statute
                 regulation or bye-law and thereafter maintained to the
                 satisfaction of the Landlord





                                       14
<PAGE>   19
         Not to hang goods

         3.21    Not to hang exhibit or deposit any goods outside the Demised
           Premises or over any footpath or roadway

         Prohibited activities

         3.22    Not to allow any auction or any meeting for political
                 religious or other similar purpose to be held in the Demised
                 Premises nor to use the Demised Premises or any part thereof
                 for any illegal or immoral purpose or for any offensive
                 disreputable or noisy trade business pursuit or occupation nor
                 for any theatrical or cinema performances or for gaming as
                 defined by the Gaming Act 1968 nor as a staff or other
                 employment agency a hairdresser a betting shop turf
                 accountants' or bookmakers' office an undertaker or travel
                 ticket or estate agency a bank office or building society
                 office a restaurant or take away food shop or as premises for
                 the hiring out of domestic or personal goods or articles or
                 for the reception of goods to be washed cleaned or repaired
                 nor for the sale for consumption on or off the Demised
                 Premises of wine spirits beer or other intoxicating liquor for
                 the cooking of food or for the sale of food or drink for
                 consumption on or off the Demised Premises as a place of
                 entertainment or as a fun fair or amusement arcade as a
                 brothel or disorderly house or as a sex establishment within
                 the meaning of the Local Government (Miscellaneous Provisions)
                 Act 1982 for the sale or keeping of live animals (including
                 birds fish or reptiles) or pet food for the sale hire
                 distribution viewing or display of any books magazines films
                 video or other recordings or other material which in the
                 opinion of the Landlord acting reasonably are offensive as
                 premises of any public or local authority to which the public
                 have access as a market fair or bazaar or for sleeping or
                 residential purposes nor to do nor permit to remain anything
                 in or upon the Demised Premises or any part thereof which may
                 in the opinion of the Landlord be or become a nuisance damage
                 disturbance danger or annoyance to the Landlord or the owners
                 or lessees or occupiers of any adjoining or neighbouring
                 property or which may prejudicially affect the Demised
                 Premises or any adjoining or neighbouring property nor leave
                 the Demised Premises untenanted or uncared for

         User

         3.23    Not to use the Demised Premises or any part thereof otherwise
                 than as offices

         Not to obstruct windows or permit encroachments

         3.24    Not to obstruct any of the windows or lights belonging to the
                 Demised Premises or any adjoining or neighbouring property nor
                 to give to any third party any acknowledgement that the access
                 of light or air to any of the windows or openings in the
                 Demised Premises is enjoyed by the consent of such third party
                 nor to pay





                                       15
<PAGE>   20
                 to such third party any sum of money nor to enter into any
                 agreement with any third party for the purpose of inducing or
                 binding such third party to abstain from obstructing the
                 access of light to any of such windows or lights nor to permit
                 any new window light passage drainage or other encroachment or
                 easement to be made into against upon or over the Demised
                 Premises or any part thereof and in case any encroachment or
                 easement whatsoever shall be attempted to be made or acquired
                 by any person or persons whomsoever to give notice thereof in
                 writing to the Landlord immediately the same shall come to the
                 notice of the Tenant and at the cost of the Tenant to do all
                 such things as may be proper or required by the Landlord for
                 preventing any new encroachment or easement being made or
                 acquired

         Not to obstruct sewers drains or watercourses

         3.25    Not to discharge pass or deposit into the sewers drains or
                 watercourses serving the Demised Premises any noxious or
                 deleterious effluent or other substance which shall cause an
                 obstruction or deposit in or injure the said sewers drains or
                 watercourses and in the event of any such obstruction deposit
                 or injury to make good such damage caused to the reasonable
                 satisfaction of the Landlord

         Refuse

                 3.26.1   Not to form any refuse dump or rubbish or scrap heap
                          on the Demised Premises or any part thereof and
                          generally keep the same clean and tidy

                 3.26.2   Not to allow rubbish of any description to accumulate
                          on the Demised Premises and to keep all rubbish and
                          refuse within the Demised Premises in properly
                          covered receptacles to the reasonable satisfaction of
                          the Landlord

         Weights

                 3.27.1   Not to suspend any excessive weight from the main
                          structure or roof of the Demised Premises

                 3.27.2   Not to overload the floors roofs or structures of the
                          Demised Premises or use the same in any manner which
                          will cause undue strain or interference therewith nor
                          to use the Demised Premises or any part thereof in
                          such manner as to subject the same to any strain
                          beyond that which they are designed to bear with due
                          margin for safety

         Electrical Supplies





                                       16
<PAGE>   21
         3.28    Not to overload the electrical wiring installations and
                 apparatus in or serving the Demised Premises and at all times
                 during the Term to ensure that the same comply with the
                 standard terms and conditions laid down from time to time by
                 the Institution of Electrical Engineers and the regulations of
                 the Electrical Supply Authority or any body of similar
                 standing

         The Planning Acts

                 3.29.1   Not at any time during the Term to do or omit
                          anything on or in connection with the Demised
                          Premises the doing or omission of which shall be a
                          contravention of the Planning Acts or of any licenses
                          consents permissions approvals and conditions (if
                          any) granted or imposed thereunder or under any
                          enactment repealed subsequently and to indemnify the
                          Landlord against all actions proceedings damages
                          penalties costs charges claims and demands in respect
                          of such acts and omissions

                 3.29.2   Not without the prior written consent of the Landlord
                          to submit an application for planning permission
                          relating to the Demised Premises to the appropriate
                          national or local or other public authority
                          (hereinafter referred to as "the planning authority")
                          and forthwith to give notice with two copies thereof
                          to the Landlord of all determinations made pursuant
                          to such application and in the event of the planning
                          authority indicating its willingness to grant the
                          desired license consent permission or approval only
                          with modifications or subject to conditions not to
                          accept such modifications or conditions without the
                          consent in writing of the Landlord such consent not
                          to be unreasonably withheld or delayed and to give
                          the Landlord forthwith full particulars of such
                          modifications or conditions

                 3.29.3   Not to implement or otherwise put into effect any
                          licence consent permission or approval relating to
                          the Demised Premises or any part thereof or otherwise
                          affecting the same obtained by the Tenant under or in
                          pursuance of the Planning Acts without first
                          obtaining the licence in writing of the Landlord such
                          Licence not to be unreasonably withheld or delayed
                          and in any such licence as may be granted the
                          Landlord may impose such conditions and requirements
                          as the Landlord shall reasonably think fit

                 3.29.4   If and when the Landlord's licence is obtained
                          pursuant to clause 3.29.3 of this sub-clause to carry
                          out the works and other things authorised by the said
                          licence and the planning permission therein referred
                          to in a good and workmanlike manner and at the cost
                          in all respects of the Tenant and to observe and
                          perform all conditions attached to such licence and
                          planning permission respectively and to keep the
                          Landlord and any Superior Landlords effectually
                          indemnified against all actions proceedings damages





                                       17
<PAGE>   22
                          penalties costs charges claims and demands whatsoever
                          in respect of the costs of the said application and
                          works and things done in pursuance of the said
                          planning permission and in respect of all breaches
                          (if any) of the said conditions and every part
                          thereof respectively


                 3.29.5   To give notice forthwith to the Landlord of any
                          notice order or proposal for a notice or order under
                          the Planning Acts served on received by or coming to
                          the notice of the Tenant and if so required by the
                          Landlord to produce the same and at the request of
                          the Landlord but at the cost of the Tenant to make or
                          join in making such objections or representation in
                          respect of any proposal as the Landlord may require

                 3.29.6   Not without the consent of the Landlord to serve any
                          notice under the Planning Acts nor to enter into any
                          agreement under Section 106 of the Town and Country
                          Planning Act 1990

                 3.29.7   If and when called upon so to do to produce to the
                          Landlord all such plans documents and other evidence
                          as the Landlord may require in order to satisfy
                          itself that the provisions of this sub-clause have
                          been complied with in all respects

                 3.29.8   If the Tenant shall receive any compensation with
                          respect to the Tenant's interest hereunder because of
                          revocation or modification of a planning permission
                          or of any restriction placed upon the user of the
                          Demised Premises under or by virtue of the Planning
                          Acts then if and when the Tenant's interest hereunder
                          shall be determined whether by surrender or under the
                          power of re-entry herein contained or otherwise the
                          Tenant shall forthwith make such provision as is just
                          and equitable for the Landlord to receive a due
                          proportion of such compensation

                 3.29.9   Unless the Landlord shall otherwise direct to carry
                          out before the expiration or sooner determination of
                          the Term any works stipulated or required to be
                          carried out to the Demised Premises by a date
                          subsequent to such expiration or sooner determination
                          as a condition of any planning permission which may
                          have been granted during the Term

         Alienation

                 3.30.1   Not at any time to assign transfer charge share or
                          part with possession or occupation of part only of
                          the Demised Premises or underlet the whole or part of
                          the Demised Premises or execute any declaration of
                          trust with regard to the whole or part of the Demised
                          Premises nor hold or occupy





                                       18
<PAGE>   23
                          the whole or part of the Demised Premises as agent
                          for or otherwise for the benefit of another

                 3.30.2   Not to transfer part with or share possession or
                          occupation of the whole of the Demised Premises save
                          by way of an assignment of the whole of the Demised
                          Premises as hereinafter permitted

                 3.30.3   Not to charge the whole of the Demised Premises
                          without the previous consent in writing of the
                          Landlord such consent not to be unreasonably withheld
                          or delayed

                 3.30.4   Not to assign the whole of the Demised Premises
                          without the previous consent in writing of the
                          Landlord which (for the purposes of section 19(1A) of
                          the Landlord and Tenant Act 1927) the Landlord shall
                          be entitled to withhold in any one or more of the
                          following circumstances:

                          3.30.4.1         if the Tenant is unable to provide
                                           references (confirming that the
                                           proposed assignee is responsible and
                                           respectable and will be able to pay
                                           the rent and meet the other
                                           outgoings and liabilities arising
                                           from this Lease) from each of the
                                           following categories namely:

                                           (i)     a bank
                                           (ii)    a trade creditor
                                           (iii)   a solicitor or an accountant
                                           (iv)    (if the proposed assignee is
                                                   or has been a tenant of other
                                                   premises) a present or former
                                                   landlord

                                           (except in cases where the financial
                                           status of the proposed assignee is
                                           such that it would be unreasonable
                                           for the Landlord to require such
                                           references)

                          3.30.4.2         if notwithstanding sub-clause
                                           3.30.4.1 the Tenant fails to
                                           demonstrate to the satisfaction of
                                           the Landlord (acting reasonably)
                                           that the proposed assignee is
                                           responsible and respectable and will
                                           be able to pay the rent and meet the
                                           other outgoings and liabilities
                                           arising under this Lease

                          3.30.4.3         if at the date of request for
                                           consent to assignment the Tenant has
                                           not paid any of the rents due
                                           hereunder or has not substantially
                                           observed and performed the covenants
                                           on the part of the Tenant in this
                                           Lease





                                       19
<PAGE>   24
                          3.30.4.4         if in the Landlord's reasonable
                                           opinion the use to which the
                                           proposed assignee intends to put the
                                           Demised Premises would be in breach
                                           of clause 3.22 or 3.23 hereof

                          3.30.4.5         (unless it is unreasonable so to
                                           require in all the circumstances) if
                                           the ability of the proposed assignee
                                           to meet its obligations under the
                                           Lease might reasonably be considered
                                           to be substantially less than that
                                           of the then current tenant)

                 3.30.5   The Landlord shall be entitled (for the purposes of
                          it Section 19(1A) of the Landlord and Tenant Act
                          1927) to give consent subject to the following
                          conditions being satisfied before this Lease is
                          assigned by the Tenant:

                          3.30.5.1         that the Landlord's proper costs
                                           disbursements and VAT for the
                                           licence to assign and any associated
                                           licence for alterations change of
                                           use or otherwise are paid

                          3.30.5.2         that the Tenant enters into an
                                           authorised guarantee agreement (as
                                           defined in Section 16 of the
                                           Landlord and Tenant (Covenants) Act
                                           1995 ("the Act") in such form as the
                                           Landlord may reasonably require
                                           under which:

                                  3.30.5.2.1       the Tenant agrees to be
                                                  liable to the Landlord as
                                                  principal debtor in respect
                                                  of each of the tenant
                                                  covenants (as defined in the
                                                  Act) to the extent that and
                                                  for so long as the proposed
                                                  assignee has any liability
                                                  therefor and is not to be
                                                  released even if the Landlord
                                                  gives the proposed assignee
                                                  extra time to comply with any
                                                  obligations or does not
                                                  insist on its strict terms

                                  3.30.5.2.2       the Tenant guarantees the
                                                  proposed assignee's
                                                  performance of those
                                                  covenants

                                  3.30.5.2.3       the Tenant agrees that in
                                                  the event of this Lease being
                                                  disclaimed it will enter into
                                                  a new lease whose term
                                                  expires no later than the end
                                                  of the Term and whose tenant
                                                  covenants are no more onerous
                                                  than those under this lease
                                                  except that the Tenant will
                                                  not be required to enter into
                                                  any further Additional
                                                  Guarantee Agreement and will
                                                  not be liable for any
                                                  subsequent assignees





                                       20
<PAGE>   25
                                  3.30.5.3         that any assignee of the
                                                  Demised Premises covenants by
                                                  deed with the Landlord to pay
                                                  the rents reserved by this
                                                  Lease and to observe and
                                                  perform all the covenants on
                                                  the part of the Tenant and
                                                  conditions contained in this
                                                  Lease during the Term until
                                                  released by virtue of the Act

                                  3.30.5.4         that (where it is reasonable
                                                  so to require) in addition to
                                                  the guarantee provided under
                                                  sub-clause 3.30.5.2 at least
                                                  two sureties of a financial
                                                  status acceptable to the
                                                  Landlord (who shall act
                                                  reasonably in judging whether
                                                  their financial status is
                                                  acceptable) shall covenant
                                                  jointly and severally with
                                                  the Landlord that the
                                                  proposed assignee will pay
                                                  the rents reserved by this
                                                  Lease and will perform and
                                                  observe the covenants on the
                                                  part of the Tenant and the
                                                  conditions contained in this
                                                  Lease in such form as the
                                                  Landlord may reasonably
                                                  require under which:

                                  3.30.5.4.1       the sureties referred to in
                                                  3.30.5.4 agree to be liable
                                                  to the Landlord as principal
                                                  debtor in respect of each of
                                                  the tenant covenants (as
                                                  defined in the Act) to the
                                                  extent that and for so long
                                                  as the proposed assignee has
                                                  any liability therefor and
                                                  not to be released even if
                                                  the Landlord gives the
                                                  proposed assignee extra time
                                                  to comply with any
                                                  obligations or does not
                                                  insist on its strict terms

                                  3.30.5.4.2       the sureties referred to in
                                                  3.30.5.4 guarantee the
                                                  proposed assignee's
                                                  performance of those
                                                  covenants

                                  3.30.5.4.3       the sureties referred to in
                                                  3.30.5.4 agree that in the
                                                  event of this Lease being
                                                  disclaimed they will enter
                                                  into a new lease whose term
                                                  expires no later than the end
                                                  of the Term and whose tenant
                                                  covenants are no more onerous
                                                  than those under this Lease

                          3.30.6  Any dispute arising under clauses 3.30.4 or
                                  3.30.5 shall be determined by a Surveyor to
                                  be agreed upon in writing by the Landlord and
                                  the Tenant and in default of such agreement a
                                  Chartered Surveyor with previous experience
                                  of lettings of properties of this nature and
                                  in the same locality as the Demised Premises
                                  to be nominated by the President for the time
                                  being or other senior officer of the Royal
                                  Institution of Chartered Surveyors





                                       21
<PAGE>   26
                                  upon the application of the Landlord or the
                                  Tenant who shall act as an arbitrator in
                                  accordance with the Arbitration Acts 1950 and
                                  1979

         Notice of Dealings

         3.31    Within twenty-eight days next after the making thereof without
                 any demand by the Landlord to produce to the Landlord or the
                 Solicitors for the time being of the Landlord for registration
                 all assignments underletting mortgages charges and other
                 dispositions and devolutions of title (together with three
                 certified copies thereof) which shall at any time during the
                 Term relate to the Demised Premises or any part thereof and to
                 pay to the Landlord's Solicitors for the registration of every
                 such document the sum of Twenty pounds (L.20.00) and any
                 further sum which is payable by the Landlord to any Superior
                 Landlords in respect of the registration thereof

         To permit persons to view

         3.32    To permit the Landlord:

                 3.32.1   at any time during the Term to enter the Demised
                          Premises to fix and retain without interference upon
                          any suitable part or parts thereof a notice board
                          stating that the reversion of these Presents or any
                          superior lease is for sale and

                 3.32.2   at any time within twelve calendar months immediately
                          prior to the expiration or sooner determination of
                          the Term and at any time thereafter (or sooner if the
                          rents or any part of them shall be in arrear and
                          unpaid for more than 28 days) to enter the Demised
                          Premises and to fix and retain without interference
                          upon any suitable part or parts thereof a notice
                          board for re-letting the Demised Premises

                 and to permit all persons authorised in writing by the
                 Landlord to view the Demised Premises and to take measurements
                 thereof at reasonable hours in the daytime without
                 interruption

         Notice to Landlords

         3.33    To give immediate notice to the Landlord of any notice or
                 order or proposal for a notice or order or claim of whatsoever
                 nature affecting the Demised Premises or any part thereof
                 served upon or otherwise coming to the notice of the Tenant
                 and if so required by the Landlord to produce the same and at
                 the request of the Landlord but at the cost of the Tenant to
                 make or join in making such objection





                                       22
<PAGE>   27
                 or representations in respect of any such notice order or
                 proposal as the Landlord may reasonably require

         Indemnity

         3.34    To keep the Landlord fully and effectually indemnified from
                 and against all expenses costs claims demands damages and any
                 other liability whatsoever arising directly or indirectly out
                 of the state of repair and condition of the Demised Premises
                 or any alteration or addition thereto or the electrical
                 installation therein or the user thereof or works carried out
                 or in the course of being carried out to the Demised Premises
                 or otherwise out of any act omission or negligence of the
                 Tenant or of any other person at the Demised Premises with the
                 express or implied authority of the Tenant or anyone deriving
                 title through the Tenant or any breach of any covenant or
                 other provision of these Presents to be observed or performed
                 by the Tenant

         Insurance

                 3.35.1   Not to do or omit any act or thing which may make
                          void or voidable any policy for the insurance of the
                          Demised Premises or of the Building or which may
                          cause an increased premium to be payable for such
                          insurance and (without prejudice to the Landlord's
                          rights of action in respect of a breach of this
                          sub-clause) to repay to the Landlord all sums paid by
                          way of increased premiums and all expenses properly
                          incurred by it in consequence of a breach of the
                          provisions of this sub-clause and all such payments
                          shall be added to the rents hereby reserved and shall
                          be recoverable as rent in arrear

                 3.35.2   In the event of the Demised Premises or any part
                          thereof being destroyed or damaged by any of the
                          Insured Risks or otherwise or if any other event or
                          thing happens against which the Landlord has insured
                          under the terms of these Presents forthwith to give
                          notice thereof to the Landlord

                 3.35.3   to give written notice to the Landlord forthwith of
                          any circumstances or events which may affect any
                          insurance relating to the Demised Premises or affect
                          the decision of any insurer to grant or continue the
                          insurance which the Landlord covenants to effect

                 3.35.4   In the event of the Demised Premises or any part
                          thereof being destroyed or damaged by any of the
                          Insured Risks and the insurance moneys under any
                          insurance against the same effected thereon being
                          wholly or partly irrecoverable by reason of any act
                          or default on the part of the Tenant or any
                          sub-tenant or their respective servants agents
                          licensees or invitees then and in every such case the
                          Tenant will forthwith pay to the Landlord the





                                       23
<PAGE>   28
                          whole or (as the case may require) a fair proportion
                          of the cost (including professional and other fees)
                          of rebuilding or reinstating the Demised Premises

                 3.35.5   To maintain in force throughout the Term an insurance
                          policy in respect of the plate glass windows and
                          glass lights of the Demised Premises against the
                          usual risks of destruction and damage by impact
                          accident or otherwise (including third party risks)
                          in the full reinstatement value thereof with an
                          insurer of repute and the Tenant will punctually pay
                          all premiums for effecting and maintaining such
                          insurance and will produce such policy and the last
                          premium receipt for inspection by the Landlord
                          whenever the Landlord shall reasonably require and
                          the Tenant will apply all money received under such
                          policy in reinstatement of such plate glass and
                          lights and make good any deficiency out of the
                          Tenant's own moneys and if the Tenant shall make
                          default in effecting or maintaining such insurance
                          then the Landlord shall be entitled to effect and
                          maintain such policy and the Tenant shall forthwith
                          on demand reimburse the Landlord all sums paid by the
                          Landlord for such purposes

                 3.35.6   Not (save as required by Clause 3.35.5 hereof) to
                          effect any policy of insurance against any of the
                          Insured Risks in respect of or relating to the
                          Demised Premises in duplication to the cover effected
                          by the Landlord PROVIDED that if any such policy is
                          effected in breach of this clause the Tenant shall
                          pay to the Landlord all monies received under such
                          policy.

         Death of Surety

         3.36    Within fourteen days of the death during the Term of any
                 person who has or shall have guaranteed to the Landlord the
                 payment of the rents and the observance and performance of the
                 covenants on the part of the Tenant herein contained or of
                 such person becoming bankrupt or having a receiving order made
                 against him or making any assignment for the benefit of or
                 entering into any arrangement with his creditors (whether by
                 composition or otherwise) or having a receiver appointed under
                 the Mental Health Act 1953 or (being a company) passing a
                 resolution to wind up or entering into liquidation or having
                 an administrative receiver or an administrator or a receiver
                 and manager appointed or being for any reason removed from the
                 Register of Companies to give notice thereof in writing to the
                 Landlord and if so required by the Landlord at the Tenant's
                 expense in all respects to procure some other person or
                 persons acceptable to the Landlord to execute a guarantee in
                 such form as the Landlord shall reasonably require PROVIDED
                 ALWAYS that if the Tenant shall be a company of which such
                 guarantor was a director the Landlord may require some other
                 director or directors of such company (including such person
                 (if any) as may be appointed to fill the place of such
                 Director) to execute such guarantee as aforesaid





                                       24
<PAGE>   29
         Defective Premises Act 1972

         3.37    In connection with the Defective Premises Act 1972 ("the said
                 Act"):

                 3.37.1   to notify the Landlord in writing immediately of any
                          defect in the Demised Premises

                 3.37.2   to erect and maintain within the Demised Premises
                          prominent notices or warnings of relevant defects
                          within the meaning of Section 4 of the said Act in
                          such form as the Landlord may from time to time
                          reasonably require

                 3.37.3   to indemnify the Landlord against any damages
                          liabilities losses actions claims proceedings demands
                          costs and expenses arising from any defect in the
                          state of the Demised Premises and/or incurred under
                          Section 4 of the said Act by reason of the Tenant's
                          failure to erect and display such notice

                 3.37.4   to permit the Landlord at any time on reasonable
                          notice to enter upon the Demised Premises for any or
                          all of the following purposes namely erecting and
                          exhibiting notices thereon and giving warning of
                          relevant defects within the meaning of Section 4 of
                          the said Act in the Demised Premises and installing
                          lighting or any other reasonable means of warning or
                          protection against such defects

         Regulations

         3.38    To perform and observe and procure compliance in all respects
                 with such reasonable regulations as may from time to time
                 hereafter be made by the Landlord or the Superior Landlord

         Information

         3.39    To produce to the Landlord upon request all plans documents
                 and other evidence which the Landlord may reasonably require
                 and which is not otherwise readily available to the Landlord
                 to enable the Landlord to satisfy itself that the provisions
                 of these Presents have been complied with

         Superior Lease

         3.40    To perform and observe the lessees covenants (other than the
                 covenant to pay rent) and the restrictions referred to in the
                 Superior Lease in so far as they relate to the Demised
                 Premises notwithstanding any inconsistency between this Lease
                 and the said covenants and restrictions contained in the said
                 Superior Lease and to indemnify and keep the Landlord
                 indemnified against all damages actions





                                       25
<PAGE>   30
                 proceedings costs claims and demands in any way arising out of
                 a breach of this covenant and not to do omit or suffer
                 anything to be done whereby the Superior Lease may be voided
                 or forfeited

         Documents in Part III of Second Schedule

         3.41    To perform and observe and procure compliance in all respects
                 with the provisions of the Documents referred to in Part III
                 of the Second Schedule hereto and to indemnify the Landlord at
                 all times against all claims costs charges and expenses in
                 respect thereof

         Keyholders

         3.42    To provide the Landlord and any managing agents of the
                 Landlord with written notice of the names and addresses and
                 telephone numbers of at least two keyholders of the Demised
                 Premises and to notify the Landlord of any change in either or
                 both of such keyholders previously so notified

4.       LANDLORD'S COVENANTS

         THE Landlord HEREBY COVENANTS with the Tenant (but not to bind itself
         after it shall have parted with the reversion immediately expectant
         hereon nor to incur further liability thereafter) as follows

         Quiet enjoyment

         4.1     That the Tenant duly paying the rents hereby reserved and made
                 payable and observing and performing the covenants and
                 conditions herein contained and on the Tenant's part to be
                 observed and performed shall and may peaceably and quietly
                 possess and enjoy the Demised Premises during the Term without
                 any disturbance by the Landlord or any persons rightfully
                 claiming under or in trust for the Landlord

         Insurance

         4.2     That the Landlord will effect and maintain or (in the event
                 that any Superior Landlords insure the Demised Premises) that
                 the Landlord will use all reasonable endeavours to procure
                 that the Superior Landlords will (subject to such cover being
                 obtainable at a reasonable rate of premium in the UK insurance
                 market and save to the extent that such insurance is rendered
                 void or voidable by reason of any act or default of the Tenant
                 or any sub-tenant or their respective servants agents invitees
                 or licensees) effect and maintain to the full reinstatement
                 value thereof an insurance of the Demised Premises against the
                 Insured Risks and at least four years' loss of rent in respect
                 of the Demised Premises and will or (in the





                                       26
<PAGE>   31
                 event that any Superior Landlords insure the Demised Premises)
                 will use all reasonable endeavours to procure that the
                 Superior Landlords will apply all moneys received by virtue of
                 any such insurance (other than in respect of loss of rent)
                 towards reinstating the Demised Premises after the destruction
                 thereof or damage thereto unless any moneys payable under such
                 insurance shall be refused in whole or in part by reason of
                 any act or default of the Tenant or any sub-tenant or their
                 respective servants agents licensees or invitees

         Repair and Maintenance

         4.3     That subject to the Tenant paying the rent reserved by
                 sub-clause 3.8 hereof the Landlord will keep in good repair
                 and condition the exterior structure roof foundations
                 entrances passages halls stairways WC's lifts (if any) and
                 landings of the Building and the car park provided that
                 notwithstanding anything herein contained the Landlord shall
                 not be liable to the Tenant for nor shall the Tenant have any
                 claim against the Landlord in respect of:

                 4.3.1    act or default of any other tenant in the Building
                          (unless the Landlord was aware of the impending
                          breach by such tenant and had failed to take
                          reasonable steps to prevent such act or default) or
                          any explosion or the defective working stoppage or
                          breakdown of any appliances apparatus or machinery
                          (including the lifts (if any)) in or connected with
                          or used for the purposes of the Demised Premises or
                          of the Building

                 4.3.2    any interruption in or failure to carry out such
                          repairs by reason of mechanical or other breakdown or
                          frost or other inclement condition or shortage of
                          materials or labour or by reason of any cause beyond
                          the Landlord's control

                 4.3.3    any defect or want of repair unless the Landlord has
                          had notice thereof and has failed to remedy the same
                          within a reasonable period thereafter

         4.4     To pay the rent reserved by the Superior Lease and observe and
                 perform the covenants on its part therein contained so far as
                 the same are not the responsibility of the Tenant by reason of
                 the covenants on its part contained in these Presents

         4.5     At the request and cost of the Tenant to use all reasonable
                 endeavours to enforce the covenants on the part of the
                 Superior Landlord contained in the Superior Lease

5.       PROVIDED ALWAYS AND IT IS HEREBY AGREED AND DECLARED as follows:

         Proviso for re-entry





                                       27
<PAGE>   32
         5.1     This Deed is made upon the express condition that if and
                 whenever the said rents sums or other payments or any parts
                 thereof shall be unpaid for fourteen days after any of the
                 days hereinbefore appointed for payment thereof (whether the
                 same shall have been lawfully demanded or not) or if the
                 covenants on the part of the Tenant herein contained shall not
                 be performed or observed or if the Tenant or any surety or
                 guarantor under these Presents shall compound or make any
                 arrangements with its creditors or shall suffer any of the
                 effects of the Tenant to be taken in execution or if the
                 Tenant or any surety or guarantor under these Presents (being
                 a corporation) has a winding-up petition or petition for an
                 administration order presented against it or passes a
                 winding-up resolution (other than for the purposes of an
                 amalgamation or reconstruction resulting in a solvent
                 corporation) or resolves to present its own winding-up
                 petition or is wound-up (whether in England or elsewhere) or
                 is for any reason removed from the Register of Companies or
                 the directors of the Tenant resolve to present a petition for
                 an administration order in respect of the Tenant or if the
                 Tenant or any Surety or guarantor under these Presents is
                 unable to pay or has no reasonable prospect of being able to
                 pay its debts within the meaning of Sections 122 and 123 of
                 the Insolvency Act 1986 or an Administrative Receiver or a
                 Receiver or a Receiver and Manager is appointed in respect of
                 the property or any part thereof of the Tenant or any surety
                 or guarantor under these Presents or if the Tenant or any
                 surety or guarantor under these Presents (being a body
                 corporate) effects a return or reduction of capital or calls a
                 meeting of its creditors or any of them or makes an
                 application to the Court under Section 129 of the Insolvency
                 Act 1986 or submits to its creditors or any of them a proposal
                 pursuant to Section 1 of the Insolvency Act 1986 or enters
                 into any arrangement scheme compromise moratorium or
                 composition with its creditors or any of them or if an
                 unlimited company shall apply to become a limited company or
                 if the Tenant or any surety or guarantor under these Presents
                 (being an individual or if more than one individual then any
                 one of them) notifies the Official Receiver or makes an
                 application to the Court pursuant to Section 253 of the
                 Insolvency Act 1986 or convenes a meeting of his creditors or
                 any of them or enters into any arrangement scheme compromise
                 moratorium or composition with his creditors or any of them
                 (whether pursuant to Part VIII of the Insolvency Act 1986 or
                 otherwise) or is unable to pay or has no reasonable prospect
                 of being able to pay his debts within the meaning of Sections
                 267 and 268 of the Insolvency Act 1986 or has a bankruptcy
                 petition presented against him or is adjudged bankrupt or dies
                 then and in any of the said cases and henceforth the Landlord
                 may re-enter upon the Demised Premises and re-possess the same
                 and immediately thereupon the Term shall cease absolutely and
                 determine but without prejudice to any right of action or
                 remedy of the Landlord in respect of any antecedent breach of
                 any of the covenants by the Tenant herein contained

         Suspension of rent





                                       28
<PAGE>   33
                 5.2.1    If the Demised Premises or any part thereof shall at
                          any time be destroyed or so damaged by any of the
                          Insured Risks so as to be unfit for occupation and
                          use and the policy or policies of insurance in
                          respect thereof shall not have been vitiated or
                          payment of the policy moneys refused in whole or in
                          part in consequence of any act or default on the part
                          of or suffered by the Tenant or any sub-tenant or
                          their respective servants agents licensees or
                          invitees then the rent hereby firstly reserved or a
                          fair and just proportion thereof according to the
                          nature and extent of the damage sustained shall be
                          suspended and cease to be payable until the Demised
                          Premises shall again be rendered fit for occupation
                          and use or until the loss of rent insurance effected
                          by the Landlord shall be exhausted (whichever is the
                          shorter) and in case of dispute as to the proportion
                          or period of such abatement the same shall be
                          referred to arbitration in accordance with the
                          Arbitration Act 1950 and 1979

                 5.2.2    If the Landlord (whether as a result of being unable
                          to obtain all planning permissions or other requisite
                          consents or otherwise) is unable to procure the
                          reinstatement of the Demised Premises referred to in
                          Clause 4.2 hereof or if these Presents shall be
                          frustrated or if such reinstatement cannot be
                          effected for any other reason beyond the control of
                          the Landlord then the Landlord shall become the
                          absolute owner of all of the insurance moneys
                          received under the policy or policies of insurance
                          effected under Clause 4.2 hereof

         Notices

         5.3     In addition to any other mode of service any notices requiring
                 to be served hereunder shall be validly served if served in
                 accordance with Section 196 of the Law of Property Act 1925 as
                 amended by the Recorded Delivery Service Act 1962 or in the
                 case of a company if served in accordance with those
                 provisions at its registered office for the time being

         Compensation

         5.4     If the tenancy hereby granted is within Part II of the
                 Landlord and Tenant Act 1954 then subject to the provisions of
                 sub-section (2) of Section 38 of that Act neither the Tenant
                 nor any assignee or underlessee of the Term or of the Demised
                 Premises shall be entitled on quitting the Demised Premises to
                 any compensation under Section 37 of the said Act

         Neighbourinq development

         5.5     Nothing herein contained or implied shall impose or be deemed
                 to impose any restriction on the use of any land or buildings
                 of the Landlord and/or any Superior





                                       29
<PAGE>   34
                 Landlords not comprised in these Presents or give the Tenant
                 the benefit of or the right to enforce or to have enforced or
                 to prevent the release or modification of any covenant
                 condition or stipulation entered into by any lessee or tenant
                 of the Landlord or any Superior Landlords in respect of any
                 property not comprised in these Presents or shall operate to
                 prevent or restrict in any way the development of any land not
                 comprised in these Presents

         Exclusion of implied easements

         5.6     The operation of Section 62 of the Law of Property Act 1925
                 shall be excluded from this Lease and the only rights granted
                 to the Tenant with the Demised Premises are those expressly
                 set out in these Presents and the Tenant shall not by virtue
                 of these Presents be deemed to have acquired or be entitled to
                 and the Tenant shall not during the Term acquire or become
                 entitled by any means whatsoever to any easement from or over
                 or affecting any other land or premises now or at any time
                 hereafter belonging to the Landlord or to any Superior
                 Landlord and not comprised in this Lease

         Continuation of obligations

         5.7     Each of the covenants herein contained on the part of the
                 Tenant shall remain in full force both at law and in equity
                 notwithstanding that the Landlord or any Superior Landlord may
                 have waived or temporarily released any such covenant or
                 waived or released temporarily or permanently revocably or
                 irrevocably any similar covenant or similar covenants
                 affecting any land or buildings of the Landlord and/or any
                 Superior Landlords not comprised in these Presents

         Damages

         5.8     The Landlord shall on giving notice in writing to the Tenant
                 have the option (in lieu of requiring works to be done by the
                 Tenant during the last year of the Term howsoever determined)
                 of requiring the Tenant to pay to the Landlord (which the
                 Tenant hereby covenants forthwith to do) the sum certified by
                 the Landlord's surveyor as being equal to the cost of carrying
                 out such work plus the surveyors fees of and in connection
                 with such certificate and such sums shall be paid by the
                 Tenant to the Landlord within fourteen days of the issue of
                 such certificate

         Waiver and Interest

                 5.9.1    No acceptance of or demand or receipt for rent or the
                          grant of any licence or approval or the registration
                          of any document by the Landlord after knowledge or
                          notice received by the Landlord or its agents of any
                          breach of the Tenants covenants and conditions herein
                          contained shall be or





                                       30
<PAGE>   35
                          operate as a waiver wholly or partially of any such
                          breach but any such breach shall for all purposes be
                          a continuing breach of covenant so long as such
                          breach shall be subsisting and no person taking any
                          estate or interest under these Presents shall be
                          entitled to set up any such acceptance of or demand
                          or receipt for rent by the Landlord or its agents as
                          a defence in any action or proceedings by the
                          Landlord

                 5.9.2    If the Landlord shall refrain from accepting or
                          demanding rents or other monies due under these
                          Presents where the Landlord reasonably considers that
                          the Tenant is in breach of any of the provisions
                          hereof or might acquire against the Landlord any
                          rights or entitlements then notwithstanding such
                          refusal interest shall be payable as referred to in
                          Clause 3.37 hereof from the due date until the
                          Landlord shall accept payment from the Tenant

         User Warranty

         5.10    Nothing herein contained or implied nor any consent hereafter
                 given by the Landlord shall be taken to be a covenant warranty
                 or representation by the Landlord that the Demised Premises
                 can lawfully be used for any particular purpose and the Term
                 and the rents hereby reserved shall not determine by reason
                 only of any changes modifications or restrictions on user of
                 the Demised Premises or obligations or requirements (if any)
                 hereafter to be made or imposed under or by virtue of the
                 Planning Acts

         Right to distrain

         5.11    If the Tenant shall make default in paying any sum reserved or
                 made payable by Clause 3 of these Presents (other than the
                 rents reserved) such sum shall be recoverable whether formally
                 demanded or not as though it was rent in arrear

         Disputes

         5.12    Any dispute arising between the Tenant and any owner or
                 occupier of adjacent premises (other than the Landlord) as to
                 any right benefit or privilege or any party or other wall or
                 structure or otherwise shall be determined on behalf of the
                 Tenant by the Landlord whose decision shall bind the Tenant
                 and whose fees shall be payable as the Landlord may direct

         Value Added Tax

         5.13    The Landlord shall have from time to time full and free right
                 to exercise any statutory option to have or cease to have any
                 rents or other sums treated as liable to Value Added Tax (or
                 similar tax as aforesaid)





                                       31
<PAGE>   36
         Commission

         5.14    Any commission or allowances paid or made to the Landlord in
                 respect of any insurance effected by the Landlord hereunder
                 may be retained by the Landlord for its own account

         Landlord's liability

         5.15    The Landlord is not responsible to the Tenant or to anyone in
                 the Demised Premises with the Tenant's express or implied
                 authority for any accident injury damage or loss

         Tenant's goods

         5.16    The Tenant irrevocably appoints the Landlord to be the
                 Tenant's agent to store or dispose of any effects left by the
                 Tenant on the Demised Premises for more than ten working days
                 after the end of the Term on any terms that the Landlord
                 thinks fit and the Landlord shall not be liable to the Tenant
                 save to account for the net proceeds of sale less the
                 reasonable costs of storage and of the sale and any other
                 expenses incurred by the Landlord and the Tenant will
                 indemnify the Landlord against any liability incurred by the
                 Landlord to any third party whose property shall have been
                 sold by the Landlord in the mistaken belief held in good faith
                 (which shall be presumed unless the contrary is proved) that
                 such property belonged to the Tenant and against any damage
                 occasioned to the Demised Premises and any actions claims
                 proceedings costs expenses and demands made against the
                 Landlord caused by or related to the presence of such effects
                 in or on the Demised Premises following the end of the Term

         Party Structures

         5.17    Such of the division walls fences or structures as divide the
                 Demised Premises from other premises shall be deemed to be
                 party structures subject to the provisions of Section 38 of
                 the Law of Property Act 1925 and shall be maintained and
                 repaired accordingly

         Exclusion of representations

         5.18    The Tenant acknowledges that it has not entered into these
                 Presents in reliance wholly or partly on any representation or
                 warranty made by or on behalf of the Landlord

         Jurisdiction





                                       32
<PAGE>   37
         5.19    These Presents shall be governed by and are to be construed in
                 all respects in accordance with the laws of England and Wales
                 and each of the parties hereby submits to the exclusive
                 jurisdiction of the Courts of England and Wales

         Headings

         5.20    The headings hereto and the headings to the Schedules hereof
                 shall not affect the construction of these Presents

         Break Clause

                 5.21.1   If the Tenant shall wish to terminate this Lease on
                          the 25 day of December 2001 and shall have given the
                          Landlord not less than six months prior notice of
                          such desire and shall up to date of service of such
                          notice and up to the date of its expiry have paid the
                          rents reserved by and performed and observed the
                          covenants on the part of the Tenant contained in this
                          Lease then upon the expiry of such notice the term
                          granted by this Lease shall determine but without
                          prejudice to the rights of the Landlord in respect of
                          any antecedent breach of covenant by the Tenant

                 5.21.2   If the Tenant shall wish to terminate this Lease on
                          the 25 day of December 2006 and shall have given the
                          Landlord not less than twelve months prior notice of
                          such desire and shall up to date of service of such
                          notice and up to the date of its expiry have paid the
                          rents reserved by and performed and observed the
                          covenants on the part of the Tenant contained in this
                          Lease then upon the expiry of such notice the term
                          granted by the Lease shall determine but without
                          prejudice to the rights of the Landlord in respect of
                          any antecedent breach of covenant by the Tenant

         Court Order

         5.22    Having been authorised so to do by an Order of the Central
                 London County Court made on the 8th day of April 1997 the
                 parties hereto agree that the provisions of sections 24 to 28
                 of the Landlord and Tenant Act 1954 (as amended) shall not
                 apply to the tenancy created by these Presents

         Superior Lease

         5.23    If there shall be any conflict between the terms of the
                 Superior Lease and the terms of this Lease then the terms of
                 the Superior Lease shall prevail

                 1.4      the ceilings of the Demised Premises up to the
                          underside of the structural slab or joists as the
                          case may be

         New Lease

         5.24    The parties hereto agree and declare that this Lease is a new
                 lease within the meaning of the Landlord and Tenant
                 (Covenants) Act 1995

I N  W I T N E S S  whereof this Deed has been executed by the parties hereto
and is intended to be and is hereby delivered the day and year first before
written

                     THE FIRST SCHEDULE above referred to
                            (The Demised Premises)

ALL THOSE premises on the Ground Floor of the Building shown for the purposes of
identification only edged red on Plan number 1 annexed hereto and there shall
be INCLUDED in the demise:-

         1.1     all floors of the Demised Premises excluding the structural
                 slab or joists as the case may be but including floor screeds
                 and other finishes

         1.2     the internal surface and plaster of all external walls and
                 columns down to the structure

         1.3     all internal non-structural walls and staircases



                                       33
<PAGE>   38
                 1.5      the windows window frames and the glass therein and
                          all doors serving the Demised Premises

                 1.6      all service media and conducting media situate within
                          and serving the Demised Premises

AND there shall be EXCLUDED from the demise:

                 2.1      the main structure of the Building

                 2.2      save as mentioned in 1.2 and 1.3 above the external
                          walls and columns of the Building

                 2.3      any service media and conducting media within the
                          Demised Premises which do not serve the Demised
                          Premises in any way

                 2.4      the letterbox the approximate position of which
                          marked by a letter X on the Plan number 1 annexed
                          hereto

                     THE SECOND SCHEDULE above referred to 
                                    PART I 
                                (Rights Granted)

(a)      The full free and uninterrupted passage and running of water soil gas
         and electricity mains water and all other services to and from the
         Demised Premises through and along all conduits pipes drains channels
         watercourses sewers wires and cables which are or may hereafter during
         the Term be in or over or under any adjoining or neighbouring property
         of the Landlord

(b)      The right to park 19 private motor vehicles in such spaces as the
         Landlord shall locate within the area shown edged blue on Plan number
         2 annexed hereto


(c)      The right to use the common parts of the Building for all proper
         purposes in connection with the use and enjoyment of the Demised
         Premises

(d)      The right of support and protection for the Demised Premises that is
         now enjoyed from the Building

(e)      The right on prior notice at a time convenient to the party whose
         premises are to be entered (save in case of emergency) to enter any
         parts of the Building as may be reasonably necessary to enable the
         Tenant to comply with its obligations under the Lease the Tenant in
         all cases causing as little damage as possible and forthwith making
         good all





                                       34
<PAGE>   39
         damage caused by such entry to the satisfaction of the Landlord or
         such party referred to above

                                    PART II

                         (Exceptions and Reservations)

(a)      The full free and uninterrupted passage and running of water soil gas
         and electricity mains water and all other services from and to the
         neighbouring adjoining or adjacent land and premises of the Landlord
         through and along all conduits pipes drains channels watercourses
         sewers wires and cables which are or may hereafter during the Term be
         in or over or under the Demised Premises with power for the Landlord
         to enter the Demised Premises in accordance with the provisions of
         this Lease

(b)      The right to enter upon the Demised Premises for all or any of the
         purposes mentioned in these Presents

(c)      The right at any time to build on rebuild or alter any adjoining or
         neighbouring premises according to such plans (whether as to height
         extent or otherwise) and in such manner as the Landlord decides even
         though this may interfere with the access of light or air to the
         Demised Premises

(d)      The right to use any adjoining or neighbouring premises for any
         purpose whatsoever and without imposing upon any adjoining or
         neighbouring premises any restrictions or conditions similar to those
         imposed upon the Tenant

(e)      All liberties privileges easements quasi-easements rights benefits and
         advantages over the Demised Premises now or from time to time enjoyed
         or intended to be enjoyed by any premises now or at any time belonging
         to the Landlord

(f)      A right of access to the BT telephone box situated within the Demised
         Premises

                                    PART III

                  (Documents relating to the Demised Premises)

1.       The entries contained in the registers of title numbers K626325 and
         K544206

2.       Transfer dated 2 August 1982 made between the District Council of
         Sevenoaks (1) D M Maynard and T G Maynard (2)

3.       Deed dated 6 March 1987 made between Let Offices Limited (1) M & G
         Life Assurance Company Limited (2) Landlink Two Limited (3) Payless
         DIY Limited (4) Ward White Retail (UK) Limited (5)





                                       35
<PAGE>   40
                      THE THIRD SCHEDULE above referred to

1.       In this Schedule the following expressions shall have the following
         meanings:

         1.1     "the first rent period"
                 shall mean the period commencing on the 21st day of April 1997
                 and ending on the 24 day of December 2001

         1.2     "subsequent rent periods"
                 shall mean the successive periods commencing on each
                 appropriate date and expiring on the next appropriate date

         1.3     "appropriate date"
                 shall mean the day following the expiry of the first rent
                 period and each subsequent fifth anniversary thereof and the
                 day preceding the expiry of the term hereby granted

         1.4     "open market rental value"
                 shall mean the best yearly rent for which the Demised Premises
                 might reasonably be expected to be let with vacant possession
                 in the open market by a willing landlord to a willing tenant
                 or tenants in whole or in parts (whichever produces the higher
                 rent) for a term of equal length to the Term (commencing on
                 and computed from the appropriate date) upon the terms and
                 conditions of these Presents (save as to the rent hereby
                 reserved but including these provisions for review and save as
                 to any restrictions on the use of the Demised Premises) and
                 upon the supposition (if not a fact)

                 1.4.1    that the Landlord and the Tenant have complied with
                          all the covenants and conditions on their respective
                          parts herein contained

                 1.4.2    that the Demised Premises are fully fitted out and
                          equipped and are fit ready and available for
                          immediate occupation and use

                 1.4.3    that no reduction is to be made to take account of
                          any rental concession or of any monetary or other
                          inducement which on a new letting with vacant
                          possession might be granted to the incoming tenant

                 1.4.4    that no work has been carried out thereon by the
                          Tenant or any undertenant or their predecessors in
                          title which has diminished the letting value of the
                          Demised Premises

                 1.4.5    that the Landlord would grant consent to assignment
                          or underletting in accordance with (but without
                          prejudice to) the provisions of these Presents





                                       36
<PAGE>   41
                 1.4.6    that any Value Added Tax charged can be recovered in
                          full by the incoming tenant

                 1.4.7    that if the Demised Premises have been destroyed or
                          damaged they have been fully restored there being
                          disregarded any effect on rent of

                 1.4.8    the fact that the Tenant or the Tenant's predecessors
                          in title have been in occupation of the Demised
                          Premises or any part thereof

                 1.4.9    goodwill attaching to the Demised Premises by reason
                          of the carrying on there at of the particular trade
                          or business of the Tenant

                 1.4.10   any improvement carried out during the Term by the
                          Tenant to the Demised Premises to which the Landlord
                          has given its written consent (where required) at the
                          Tenant's own expense in accordance with the terms of
                          these Presents otherwise than in pursuance of an
                          obligation to the Landlord

                 1.4.11   any possibility that the Demised Premises may be
                          demolished redeveloped or substantially altered or
                          may be occupied by the Landlord for purpose of its
                          business at the end of the Term

                 1.4.12   any effect on rent of any restrictions imposed by any
                          statute which operate to impose any limitation in
                          relation to the review of rent or the collection of
                          any increase in rent

                 1.4.13   the taxable status of any party for the purpose of
                          Value Added Tax or any other tax

                 1.4.14   any estimate of future rent calculated in relation to
                          any loss of rent provision in any insurance policy
                          relating to the Demised Premises

                 1.4.15   any obligation on the Tenant arising under these
                          Presents to rebuild reinstate or replace the Demised
                          Premises or any part or parts thereof

                 1.4.16   the fact that any part of the Demised Premises may be
                          or become available for letting but be underlet

2.       The yearly rent payable under these Presents for the Demised Premises
         shall be:

         2.1     For the first rent period the sum of SIXTY TWO THOUSAND ONE
                 HUNDRED POUNDS ( L.62,100)





                                       37
<PAGE>   42
         2.2     In the subsequent rent periods a sum equal to the yearly rent
                 payable immediately before the appropriate date or (if
                 greater) to the open market rental value of the Demised
                 Premises on the appropriate date

3.       If the Landlord and the Tenant shall not have agreed the open market
         rental value before the appropriate date (or by such later date as may
         be agreed in writing by the Landlord and the Tenant) the open market
         rental value shall be determined by a Surveyor (hereinafter called
         "the appointed Surveyor") to be agreed upon in writing by the Landlord
         and the Tenant and in default of such agreement a Chartered Surveyor
         (who shall so far as practicable be a Chartered Surveyor with previous
         experience of lettings of properties of this nature and in the same
         locality as the Demised Premises) to be nominated by the President for
         the time being or other senior officer of the Royal Institution of
         Chartered Surveyors upon the application of the Landlord at any time
         after the appropriate date

4.       The determination of the open market rental value by the appointed
         Surveyor (which shall at the option of the Landlord be made by him as
         an expert or as an arbitrator in accordance with the Arbitration Act
         1950 and 1979) shall be final and binding on the Landlord and the
         Tenant

5.       In the case of reference to an expert:

         5.1     the appointed Surveyor shall afford to each of the parties an
                 opportunity to submit representations valuations and reasons
                 to him which the appointed Surveyor shall consider but by
                 which he shall not be bound and shall give to the parties
                 written notice of the amount of the open market rental value
                 as determined by him

         5.2     the costs of any reference to the appointed Surveyor shall be
                 in his award and failing such award the costs shall be payable
                 by the parties in equal shares

         5.3     if the appointed Surveyor shall fail to give notice of his
                 determination within a reasonable period or if he shall die or
                 shall be unwilling to act or become incapable of acting or if
                 for any other reason he is unable to act then either the
                 Landlord or the Tenant may request the President for the time
                 being or other senior officer of the Royal Institution of
                 Chartered Surveyors to discharge the appointed Surveyor and
                 appoint another Surveyor in his place which procedure may be
                 repeated as many times as necessary

6.       In the case of an arbitration the parties shall be entitled to submit
         evidence of the decision of any Court as to level of rent pursuant to
         the Landlord and Tenant Act 1954 and of the decision of any arbitrator
         and the appointed Surveyor shall be entitled to have regard to such
         evidence

7.       If on the appropriate date the open market rental value shall not have
         been agreed or determined as aforesaid the yearly rent reserved
         hereunder immediately before the





                                       38
<PAGE>   43
         appropriate date shall continue to be payable until the agreement or
         determination of the open market rental value but so that immediately
         on demand after such agreement or determination the excess (if any) of
         the amount which would have been payable had the agreement or
         determination been made before the appropriate date over the amount
         actually paid by the Tenant shall be paid by the Tenant to the
         Landlord together with interest at the rate of two per cent per annum
         above Lloyds Bank PLC Base Rate for the time being or such other
         designated rate as shall be substituted therefor by Lloyds Bank PLC
         and in force at the date of commencement of the period in respect of
         which any payment of interest accrues due under this paragraph on the
         excess (if any) from the appropriate date to the date of payment
         thereof and if not paid shall be recoverable as rent in arrear

8.       If on the appropriate date there shall be in force any enactment
         (which expression includes any Act of Parliament now or hereafter in
         force as well as any instrument regulation or order made thereunder or
         deriving validity therefrom) which shall relate to the control of
         rents and which shall restrict interfere with or affect the Landlord's
         right to revise the rent hereby reserved in accordance with the terms
         hereof or to recover the whole or any part of such revised rent then
         the Landlord shall be entitled

         8.1     once following each removal or modification of such enactment
                 to serve notice (hereinafter called an "Interim Notice") upon
                 the Tenant and from and after the date of service of such
                 Interim Notice until the next appropriate date or the service
                 of the next Interim Notice or the expiration of the Term
                 (whichever shall first occur) the rent shall be increased to
                 whichever is the higher of the open market rental value at the
                 date of service of the Interim Notice or the rent payable
                 immediately prior thereto and the provisions of this Schedule
                 shall apply accordingly with the substitution of the said date
                 of service for the relevant appropriate date

         8.2     to recover any increase in rent with effect from the earliest
                 date permitted by law

9.       If and when the open market rental value has been agreed  or
         determined as aforesaid the Landlord and the Tenant shall forthwith at
         the cost of the Tenant execute memoranda recording such agreement or
         determination

                              THE FOURTH SCHEDULE

                                 Service Charge

         1.1     the repair (including rebuilding where necessary or desirable)
                 renewal replacement maintenance amendment cleansing and
                 redecoration and other works to put and keep in good and
                 substantial repair and condition and (where applicable) in
                 good working order:





                                       39
<PAGE>   44
                 1.1.1    the exterior structure roof and foundations of the
                          Building but excluding nevertheless such parts
                          thereof as are included in the Demised Premises and
                          also the corresponding parts of all other tenanted
                          premises in the Building

                 1.1.2    the entrances passages halls stairways WC's lifts (if
                          any) and landings and all other parts of the Building
                          (all of which are hereinafter called "the said common
                          parts")

                 1.1.3    all conduits pipes drains channels watercourses wires
                          and cables in under or upon the Building which shall
                          serve the same (excluding nevertheless any which are
                          included in the Demised Premises or other tenanted
                          premises in the Building

                 1.1.4    all apparatus plant equipment and machinery serving
                          the lifts heating hot water systems security systems
                          entry phones and the electric lighting appliances in
                          the Building

                 1.1.5    the boundary walls and fences of and in the curtilage
                          of the Building

                 1.1.6    the forecourts yards pathways approach roads and car
                          parks within the curtilage of the Building

                 1.1.7    all parts of the Building not hereinbefore mentioned
                          including all parts thereof used for or in connection
                          with the provision of services

         1.2     the cleaning and lighting of the said common parts

         1.3     the provision of heating to such temperature as the Landlord
                 may deem adequate between the first day of October and the
                 first day of April inclusive in each year or during such
                 shorter period or periods as the Landlord may deem adequate
                 having regard to weather conditions at the time prevailing and
                 between the hours of 8 a.m. and 6 p.m. on weekdays (excluding
                 Saturdays Sundays Bank Public and other general holidays) and
                 constant hot water between such times and on such days as
                 aforesaid throughout the year

         1.4     the supply provision purchase maintenance repair and renewal
                 as need be of such fire fighting equipment or apparatus in the
                 said common parts and such fire escapes for the Building as
                 the Landlord may deem desirable or necessary or as may be
                 required to be supplied and maintained by it by statute or by
                 the fire authority for the district

         1.5     the cleaning of the windows in the said common parts





                                       40
<PAGE>   45
         1.6     the supply provision purchase maintenance renewal replacement
                 and repair of all appurtenances fixtures and fittings bins
                 receptacles tools appliances materials and other things
                 (including but without limiting the generality of the
                 foregoing telephone or telephones) which the Landlord may deem
                 desirable or necessary for the maintenance upkeep or
                 cleanliness of the Building or for the better performance and
                 supply of the duties and services referred to in this Schedule

2.       The costs of supply of electricity gas oil and other fuel and all
         materials and commodities for all purposes referred to in this
         Schedule

3.       The costs of employing staff for the performance of the duties and
         services referred to in this Schedule and for the general conduct
         management and security of the Building and all parts thereof and all
         other incidental expenditure in relation to such employment (including
         but without limiting the generality of such provision) the payment of
         statutory and such other insurance health pension welfare and other
         payments contributions and premiums that the Landlord may in its
         absolute discretion deem desirable or necessary and the provision of
         uniforms working clothes tools appliances cleaning and other materials
         bins receptacles and other equipment for the proper performance of
         their duties

4.       The costs of the supply of water to the Building

5.       All rates taxes duties charges assessments impositions and outgoings
         whatsoever (whether parliamentary parochial local or of any other
         description and whether or not of a capital or non-recurring nature)
         which are now or may at any time hereafter be taxed assessed charged
         or imposed upon or payable in respect of all parts of the Building not
         exclusively occupied by a tenant

6.       The cost of insuring and keeping insured the Building pursuant to
         sub-clause 4.2 hereof

7.       The establishment and maintenance of a sinking fund to provide for
         depreciation and replacement of any boilers apparatus equipment plant
         and machinery used in and about the Building

8.       The fees of the Landlord and/or the Landlord's Agent for the general
         management of the Building including fees for collection of rents
         provided that such fees shall at no time exceed the maximum therefor
         allowed by the scales authorised for the time being of the Royal
         Institution of Chartered Surveyors

9.       The proper cost of preparing and auditing service charge accounts and
         the Certificate (whether carried out by the Landlord or by its agents
         or accountants)

10.      The proper and reasonable cost of obtaining such professional advice
         as may from time to time be required in relation to the management of
         the Building and the provision of the duties and services referred to
         in this Schedule





                                       41
<PAGE>   46
11.      The amount which the Landlord may be called upon to pay towards the
         expense of making rebuilding renewing repairing maintaining lighting
         and cleansing all party walls fences and structures and all service
         areas access ways and roads and all pipes sewers drains watercourses
         wires cables and other things used or to be used for the Building in
         common with other premises near or adjoining thereto

12.      The cost of taking all steps deemed desirable or expedient by the
         Landlord for complying with and making representations against or
         otherwise contesting the incidence of the provisions of any
         legislation or orders or statutory requirements thereunder concerning
         fire escapes Town and Country Planning public health highways streets
         drainage or other matters relating or alleged to relate to the
         Building and for which the Tenant or the tenants of other tenanted
         premises in the Building are not directly liable

13.      Commitment fees interest and any other cost of borrowing money when
         necessary to finance the duties and services referred to in this
         Schedule

14.      All other things done and services provided for the benefit of the
         occupiers of the Building or in the interests of good estate
         management

PROVIDED ALWAYS that the Landlord may at its absolute discretion withhold add
to extend vary or make any alterations to the rendering of the said duties and
services or any of them from time to time if the Landlord at its like
discretion deems it desirable so to do for the more efficient conduct and
management of the Building




THE COMMON SEAL of PAYLESS        )
PROPERTIES LIMITED was            )                [SEAL]
hereunto affixed in the           )
presence of:                      )

                  Director  /s/   [illegible signature]

                  Secretary /s/   [illegible signature]





                                       42

<PAGE>   1
                                                                   EXHIBIT 10.38




                              HORIZON SEISMIC INC
                            (US) OFFICE, WESTHEIMER,
                                  HOUSTON, USA
<PAGE>   2
                                                      STANDARD OFFICE LEASE FORM
                                                      (WITH BASE YEAR)



                                LEASE AGREEMENT

         THIS LEASE AGREEMENT ("Lease") is entered as of the ____ day of
_______________ 1994 between PINCAY OAKS, INC.  ("Landlord"), and HORIZON
EXPLORATION, LIMITED ("Tenant" ).

                    ARTICLE 1 LEASE PREMISES, TERM, AND USE

         1.01.   Leased Premises.

         (a)     Upon the terms, provisions and conditions hereof, Landlord
hereby leases to Tenant and Tenant hereby leases from Landlord the premises
reflected on the floor plans set forth in Exhibit "A" hereto in the building
known as WESTHEIMER CENTRAL PLAZA ("Building") and located at 11200 WESTHEIMER,
Houston, Harris County, Texas.  References in this Lease to the "Complex" shall
mean the Building, the parking garage ("Garage") adjacent to and servicing the
Building and all other facilities, parking areas, improvements, structures, and
landscaping areas relating to or servicing the Building and Garage and located
on or installed in or to be located on or installed in the land ("Land")
described in Exhibit "B" hereto.  Such premises, together with any other space
in the Complex leased by Tenant pursuant hereto, are herein called the "Leased
Premises."

         (b)     The "Rentable Area" of the Leased Premises is hereby
stipulated and agreed for all purposes to be 2,874 square feet.

         1.02.   Term.  Subject to the terms, provisions and conditions hereof,
this Lease shall continue in force for a term ("Term") of SIXTY-THREE (63)
calendar months, beginning on the 1ST day of SEPTEMBER, 1994 (such commencement
date being subject to adjustment as provided in Sections 3.03(b) and (c), and
being hereinafter called the "Commencement Date") and ending on the 30TH day of
NOVEMBER, 1999.

         1.03.   Use.  Tenant (and its permitted assignees and sublessees, if
any) will occupy and use the Leased Premises solely for general business office
purposes of a lawful nature and for no other purpose.

                               ARTICLE 2  RENTAL

         2.01.   Base Rental.  Tenant shall pay an annual base rental ("Base
Rental") in the sum of $  *   and No/100 Dollars ($  *  ) per year payable in
equal monthly installments of   *   and   *  /100 Dollars ($  *  ).  The Base
Rental includes the Tenant's proportionate share of the Base Year (hereinafter
defined) Basic Operating Costs.
<PAGE>   3
<TABLE>
<CAPTION>
                 MONTHS                      MONTHLY          ANNUALLY
                 ------                      -------          --------
                 <S>                         <C>              <C>
                 *09/1/94 - 11/30/94         Abated           Abated
                 12/01/94 - 11/30/95         2,395.00         28,740.00
                 12/01/95 - 11/30/99         2,514.75         30,177.00
</TABLE>

         2.02.   Tenant's Share of Basic Operating Costs.

         (a)     Tenant shall also pay Tenant's Share (hereinafter defined) of
any increases in the Basic Operating Costs (hereinafter defined) for the
Complex in excess of the Basic Operating Expenses for the "Base Year."  The
Base Year is hereby stipulated and agreed for all purposes to be 1994.  Prior
to the commencement of each calendar year during the Term, Landlord shall
provide a then current estimate of annual Basic Operating Costs, and thereafter
Tenant shall pay, as additional rental, in monthly installments in accordance
with Section 2.04, Tenant's Share of the difference between estimated annual
Basic Operating Costs and the Base Year Basic Operating Costs for the calendar
year in question.

         (b)     As soon as possible after the conclusion of each calendar year
of the Term, Landlord shall furnish to Tenant a statement of actual Basic
Operating Coats for such year, and within thirty (30) days thereafter an
appropriate cash adjustment shall be made between Landlord and Tenant to
reflect any overpayment or underpayment of Rent (hereinafter defined) because
of any difference between Landlord's estimate of, and the actual, Basic
Operating Costs.  In the event of the termination of the Term at a time other
than the end of a calendar year, Landlord may provide to Tenant after such
termination a statement specifying any changes in the then current estimate of
Basic Operating Costs, and within thirty (30) days thereafter an appropriate
cash adjustment shall be made between Landlord and Tenant to reflect any
underpayment or overpayment of Rent for the portion of such calendar year
preceding the termination of the Term.  As soon as possible after the
conclusion of the calendar year in which the Term is terminated, Landlord shall
provide Tenant with the statement of the actual Basic Operating Costs, and a
cash settlement shall be made between Landlord and Tenant in accordance with
the first sentence of this Section 2.02(b).

         (c)     "Tenant's Share" shall mean the amount by which the Basic
Operating Costs exceed the Base Year Basic Operating Costs for any year or
partial year during the Term which is based upon the proportion which the
Rentable Area of the Leased Premises bears to ninety-five percent (95%) of the
Rentable Area of the Building or to the total Rentable Area leased in the
Building if such total is greater than 95% of the Building Rentable Area.

         (d)     "Basic Operating Costs" shall mean the operating expenses of
the Complex and all expenditures by Landlord to own, maintain and operate the
Complex.  All operating expenses shall be determined on an accrual basis in
accordance with generally accepted accounting principles which shall be
consistently applied.  Such operating expenses shall include all expenses,
costs and disbursements of every kind and nature which Landlord shall pay or
become obligated to pay because of or in connection with the ownership,
operation, and maintenance of the Complex, including, but not limited to, the
following:





                                       2
<PAGE>   4
                 (1)      Wages and salaries of all employees engaged in direct
operation and maintenance of the Complex, employer's social security taxes,
unemployment taxes or insurance and any other taxes which may be levied on such
wages and salaries, and the cost of disability and hospitalization insurance
and pension or retirement benefits for such employees;

                 (2)      Cost of leasing or purchasing all supplies, tools,
equipment and materials used in the operation, maintenance and ownership of the
Complex;

                 (3)      Cost of all utilities for the Complex, including the
cost of water and power, sewage, heating, lighting, air-conditioning and
ventilating for the Complex;

                 (4)      Cost of all maintenance and service agreements for
the Complex and surrounding grounds, including but not limited to janitorial
service, security service, equipment leasing, energy management system leasing,
landscape maintenance, alarm service, window cleaning and elevator maintenance;

                 (5)      Cost of all insurance relating to the Complex,
including, but not limited to, casualty insurance, rental insurance and
liability insurance applicable to the Complex and Landlord's personal property
used in connection therewith as well as any deductible sum required by any such
policies;

                 (6)      All taxes and assessments and governmental charges
(including but not limited to mortgage taxes and other taxes and assessments
passed on to Landlord by a mortgagee holding a lien on the Complex), whether
federal, state, county or municipal and whether they be by taxing districts or
authorities presently taxing the Leased Premises or by others, subsequently
created or otherwise and any other taxes, association dues and assessments
attributable to the Complex or its operation excluding, however, income taxes,
estate and inheritance taxes, excess profit taxes, franchise taxes, taxes
imposed on or measured by the income of Landlord from operation of Complex,
sales and other taxes imposed on amounts paid by Tenant hereunder (including,
without limitation, sales taxes imposed on the Parking Charge, as hereinafter
defined), and taxes imposed on account of a transfer of ownership of the
Complex or the Land;

                 (7)      Cost of repairs and general maintenance (excluding
such repairs and general maintenance paid by insurance proceeds or by Tenant or
other third parties and alterations attributable solely to tenants of the
Building other than Tenant);

                 (8)      Legal expenses and accounting expenses incurred with
respect to the Complex;

                 (9)      Fees for management services, whether provided by an
independent management company, by Landlord or by any affiliate of Landlord;

                 (10)     Costs in order to comply with new or revised federal
or state laws or municipal ordinances or codes or regulations promulgated under
any of the same; and;





                                       3
<PAGE>   5
                 (11)     Amortization of the cost of installation of capital
investment items which are primarily for the purpose of reducing (or avoiding
increases in) operating costs or which may be required by governmental
authority.  The costs of such capital investment items under this Section
2.2(d)(11) shall include costs incurred in financing the purchase of such
items, including loan fees and interest.  All costs of such capital investment
items shall be amortized over the reasonable life of such items with the
reasonable life and amortization schedule being determined in accordance with
generally accepted accounting principles and in no event to extend beyond the
reasonable life of the Complex.

Basic Operating Costs shall not include (i) expenditures classified as capital
expenditures for Federal income tax purposes (except as set forth in Section
2.02(d)(11), (ii) costs for which Landlord is entitled to specific
reimbursement by Tenant, any other tenant of the Building, or any other third
party, (iii) allowances specified in the Work Letter (hereinafter defined) for
expenses to be incurred by Landlord for improvements to Leased Premises, (iv)
leasing commissions, and all noncash expenses (including depreciation), and (v)
debt service on any indebtedness secured by the Complex (except debt service on
indebtedness to purchase or pay for items specified as permissible Basic
Operating Costs under Section 2.02(d)(1) through (11)).

                 (12)     Notwithstanding any other provision herein to the
contrary, it is agreed that in the event the Building is not fully occupied
during any year or any portion of any year of the Term, an adjustment shall be
made in computing the Basic Operating Costs for that year so that the Basic
Operating Costs shall be increased for that year to the amount that, in
Landlord's judgment, would have been incurred had the total Rentable Area of
the entire Building been fully occupied during the entirety of that year.  It
is the intent of this Section that Landlord shall not be required to bear any
portion of the Basic Operating Costs which exceed the Base Year Basic Operating
Costs for any year or partial year of the Term.

         (e)     Tenant, at its expense, shall have the right, upon giving
reasonable notice, to audit Landlord's books and records relating to any
increased or additional rental payable hereunder for any periods within two (2)
years prior to such audit; or at Landlord's sole discretion, Landlord will
provide an audit or report prepared by a certified public accountant, which
audit or report for purposes of this Lease shall be conclusive.

         2.03.   Parking.  Landlord hereby agrees to make available to Tenant
and Tenant hereby agrees to pay for and take, during the full term of this
Lease,  TWO (2) contract assigned parking permits and SEVEN (7) contract
unassigned parking permits (hereinafter collectively called the "Initial
Parking Permits") in the Complex parking garage (hereinafter called the
"Garage"), upon the following terms and conditions:

                 (1)      Tenant shall pay as rental ("Parking Rentals") for
the Initial Parking Permits the rates charged from time to time by the operator
of the Garage, plus all taxes applicable thereto.  The initial monthly rate for
each of the Initial Parking Permits for assigned parking shall be $ N/A plus
taxes, and for unassigned parking shall be $ N/A plus taxes.  Said rentals
shall be





                                       4
<PAGE>   6
due and payable to Landlord as additional Rent on the first day of each
calendar month during the term of this Lease.

         2.04.   Payment of Rent.  The term "Rent" as used herein shall mean
the Base Rental, the Tenant's Share of any increases in the Basic Operating
Costs over the Base Year Basic Operating Costs, the Parking Rentals and all
other amounts provided for in this Lease to be paid by Tenant, all of which
shall constitute rental in consideration for this Lease and the leasing of the
Leased Premises.  The Rent shall be due and payable in advance in monthly
installments on the first day of each calendar month during the Term hereof, in
legal tender of the United States of America to Landlord at the address shown
in Section 5.16 or to such other person or at such other address as Landlord
may from time to time designate in writing.  The Rent shall be paid without
notice, demand, abatement, deduction or offset except as otherwise expressly
provided for in Sections 5.01 and 5.02.  In no event shall the Landlord accept
or be bound by any payment of Rent more than thirty (30) days in advance.  If
the Term commences or ends on any day other than the first or last day of a
calendar month, then the installment of Base Rental and the Parking Rentals for
such partial month shall be appropriately prorated.  If the Term commences or
ends at any time other than the first day of a calendar year, the Tenant's
Share of any increases in the Basic Operating Costs over the Base Year Basic
Operating Costs shall be prorated for such year according to the number of days
of the Term during such year.  In no event shall Base Rental or monthly
installments thereof be less than the amounts specified in Section 2.01.

         2.05.   Security Deposit.  Landlord hereby acknowledges receipt of
$2.395.00 representing December 1994, the first month's rental paid in advance,
and an amount of $2,395.00 representing Tenant's deposit ("Security Deposit")
as security for the full and faithful performance by Tenant of the terms,
conditions, and covenants of this Lease which are to be performed and kept by
Tenant.  Landlord may apply any portion of the Security Deposit as may be
necessary to cure an Event of Default (hereinafter defined) by Tenant
hereunder, including (but not limited to) the failure of Tenant to pay Rent or
any other charges which accrue in favor of Landlord hereunder.  In the event
Tenant fails to repair damages caused or occasioned by Tenant, including
damages caused by the removal of fixtures allowed to be removed under Section
4.07, Landlord may apply any portion of the Security Deposit as may be
necessary to make such repairs.  Any remaining balance of the Security Deposit
shall not be considered as an advance payment of Rent or a measure of
Landlord's damages in case of default by Tenant.  Landlord's deduction of the
amounts owed by Tenant to Landlord from the Security Deposit shall in no event
release Tenant from being in default under the terms of the Lease.  Tenant
agrees to hold harmless any Landlord's Mortgagee (as defined in Section 4.10)
for the failure to return Tenant's Security Deposit.





                                       5
<PAGE>   7
                         ARTICLE 3  LANDLORD'S SERVICES

         3.01.   Services to be Furnished by Landlord.

         (a)     Landlord shall use all reasonable efforts to furnish, subject
to the Building Rules and Regulations (hereinafter defined) and Tenant's
performance of its obligations hereunder, the following services:

                 (1)      Air-conditioning and heating in season, during Normal
Building Operating Hours (hereafter defined), at such temperatures and in such
amounts as are considered by Landlord to be standard;

                 (2)      Hot and cold water at those points of supply provided
for lavatory and drinking purposes only;

                 (3)      Janitor service in and about the Building and the
Leased Premises five (5) days per week, and periodic window washing; however,
Tenant shall pay, as additional Rent upon presentation of a statement therefor
by Landlord, the additional costs attributable to the cleaning of improvements
within the Leased Premises other than Building Standard (hereinafter defined)
improvements;

                 (4)      Elevators for access to and egress from the Leased
Premises;

                 (5)      Electricity and proper facilities to furnish
sufficient electrical power during Normal Building Operating Hours for normal
office machines and other machines of low electrical consumption, but not
including electricity or air conditioning required for electronic data
processing equipment, special lighting in excess of Building Standard, or any
other item of electrical equipment which singly consumes more than 0.5
kilowatts per hour at rated capacity or requires a voltage other than 120 volts
single phase; and

                 (6)      Replacement of fluorescent lamps in Building Standard
light fixtures installed by Landlord and incandescent bulb or fluorescent lamp
replacement in public toilet and restroom areas and stairwells.

         (b)     Equipment and personnel to limit access to the Building after
normal business hours; provided, however, Landlord shall have no responsibility
to prevent, and shall not be liable to Tenant for, and shall be indemnified by
Tenant against, liability or loss to Tenant, its agents, employees and visitors
arising out of losses due to theft, burglary, or damage or injury to persons or
property caused by persons gaining access to the Building or the Leased
Premises, and Tenant hereby releases Landlord from all liability relating
thereto.  Landlord shall furnish one (1) cardkey for each six hundred fifty
(650) square feet of Rentable Area of the Leased Premises, any additional
cardkeys will be furnished at a charge by Landlord on an order signed by Tenant
or Tenant's authorized representative.  All such cardkeys shall remain the
property of Landlord.  No additional locks shall be allowed on any door of the
Leased Premises without Landlord's





                                       6
<PAGE>   8
permission, and Tenant shall not make or permit to be made any duplicates of
such cardkeys, except those furnished by Landlord.  Upon termination of this
Lease, Tenant shall surrender to Landlord all the cardkeys for the Leased
Premises, and give to Landlord the explanation of the combination of all locks
for safes, safe cabinets, and vault doors, if any, in the Leased Premises.

         (c)     "Normal Building Operating Hours" shall be from 7:00 a.m. to
6:00 p.m. Monday through Friday, and 8:00 a.m. to 1:00 p.m. Saturday, exclusive
of Sundays and "holidays." "Holidays" shall refer, without limitation, to New
Year's Day, Good Friday, Memorial Day, Independence Day, Labor Day,
Thanksgiving Day, Friday following Thanksgiving Day, Christmas Day, and other
holidays commonly observed by a majority of the tenants of the Building.  If
the holiday occurs on Saturday or Sunday, the Friday preceding or the Monday
following may, at Landlord's discretion, be observed as a holiday.

         (d)     Failure by Landlord to any extent to furnish services
hereunder or any cessation thereof shall not render Landlord liable in any
respect for damages to either person or property, nor be construed as an
eviction of Tenant, nor work an abatement of Rent, nor relieve Tenant from
fulfillment of any covenant or agreement hereof.  Should any of such services
be interrupted, Landlord shall use reasonable diligence to restore the same
promptly, but Tenant shall have no claim for rebate of Rent, damages, or
eviction on account thereof.

         (e)     Tenant shall pay to Landlord, monthly as billed, as Additional
Rent hereunder, such charges as may be separately metered or as Landlord may
compute for (i) any utility services utilized by Tenant for computers, data
processing equipment or other similar electrical equipment; (ii) extra
lighting; (iii) air-conditioning, heating and other services in excess of that
stated in Sections 3.01 (a)(1) and (5) hereof; or (iv) other air-conditioning,
heating and services not standard for the Building or provided at times other
than Normal Building Operating Hours.  Landlord may elect to estimate the
charges specified to be paid by Tenant under this Section 3.01(e) and bill such
charges to Tenant monthly in advance, in which event Tenant shall pay such
estimated charges and when the actual amounts of such charges are determined by
Landlord an appropriate cash adjustment shall be made between Landlord and
Tenant to reflect any underpayment or overpayment of such charges because of
any difference between Landlord's estimate of, and the actual amount of such
charges.  Tenant shall pay all costs associated with providing separate utility
meters to the Leased Premises.  In the event separate utility meters are
provided to the Leased Premises, Landlord may elect to have all charges for the
utilities separately metered to the Leased Premises billed directly to the
Tenant.

         3.02.   Access by Tenant Prior to Commencement of Term.  Landlord, at
its discretion, may permit Tenant and its employees, agents and suppliers to
enter the Leased Premises prior to the Commencement Date to enable Tenant to do
such things as may be required by Tenant to make the Leased Premises ready for
Tenant's occupancy.  If such permission is granted, such parties will not
interfere with or delay the performance of any activities by Landlord or other
occupants of the Building.  Landlord may withdraw such permission upon
twenty-four (24) hours notice to Tenant if Landlord determines that any such
interference or delay has been or may be caused.  Any such entry into the
Leased Premises shall be at Tenant's risk and Landlord shall not





                                       7
<PAGE>   9
be liable in any way for personal injury, death, or property damage which may
be suffered in or about the Leased Premises or the Building by Tenant or its
employees, agents, contractors, suppliers or workmen, and Tenant hereby
indemnifies Landlord therefrom.

         3.03.   Construction of Improvements to be made by Landlord.

         (a)     The Leased Premises shall be delivered to Tenant at the
Commencement Date in its current condition with only the additional leasehold
Improvements and tenant finish, if any, set forth and described on Exhibit "C"
attached hereto.  The cost of installation of improvements to the Leased
Premises requested by Tenant (calculated at Landlord's actual cost plus an
additional charge of 15% to cover overhead) shall be for Tenant's account and
at Tenant's cost (and Tenant shall pay ad valorem taxes thereon), which cost
shall be payable by Tenant to Landlord as a part of the Rent hereunder promptly
upon being invoiced therefor, and failure by Tenant to pay such cost in full
within thirty (30) days after the date of billing shall constitute failure to
pay Rent when due and an Event of Default by Tenant hereunder giving rise to
all remedies available to Landlord under this Lease.

         (b)     Subject to Section 3.03(c), if on the Commencement Date
specified in Section 1.02 any of the work described in Exhibit "C" that is
required to be performed by Landlord at Landlord's expense has not been
substantially completed as reasonably determined by Landlord, or if Landlord is
unable to tender possession of the Leased Premises to Tenant on the
Commencement Date, then the Commencement Date (and commencement of installments
of Rent) shall be postponed until such work to be performed in the Leased
Premises at Landlord's expense is substantially completed as reasonably
determined by Landlord or until Landlord is able to tender possession of the
Leased Premises to Tenant, as the case may be, and such postponement shall
operate to extend the expiration date specified in Section 1.02 hereof in order
to give full effect to the stated duration of the Term.  The deferment of
installments of Rent and postponement of the Commencement Date pursuant to this
Section 3.03(b) shall be Tenant's exclusive remedy for Landlord's delay of
completion of improvements to the Leased Premises or failure to tender
possession of the Leased Premises to Tenant, and Tenant shall have no claim
against Landlord because of any such delay in completion of Improvements or
failure to deliver the Leased Premises.

         (c)     No delay in the completion of the Leased Premises resulting
from (i) delay or failure on the part of Tenant in furnishing information or
other matters required in Exhibit "C", (ii) changes ordered by Tenant in the
Tenant's Plans (hereinafter defined), (iii) improvements to the Leased Premises
constructed by Landlord at Tenant's request and expense pursuant to Section
4.05 and Exhibit "C", and/or (iv) delay or failure on the part of Tenant to pay
any amounts required to be paid by Tenant for construction or improvements to
the Leased Premises, shall delay the Commencement Date, expiration date, or
commencement of payment of Rent.  If prior to the Commencement Date Tenant
shall enter into possession of all or any part of the Leased Premises, (other
than an entry with Landlord's consent pursuant to Section 3.02) then the Term,
the payment of monthly installments of Rent and all other obligations of Tenant
to be performed during the Term shall commence on, and the Commencement Date
shall be deemed for all





                                       8
<PAGE>   10
purposes to be, the date of such entry, and the total amount of Rent shall be
increased accordingly, provided that no such early entry shall operate to
change the expiration date provided herein.

         (d)     Tenant shall not make or allow to be made (except as otherwise
provided in this Lease) any alterations or physical additions (including
fixtures) in or to the Leased Premises, or place safes, vaults or other heavy
furniture or equipment within the Leased Premises, without first obtaining the
written consent of Landlord.  Tenant shall deliver to Landlord a copy of the
"as-built" plans and specifications for all alterations or physical additions
so made in or to the Leased Premises, and shall reimburse Landlord for the cost
incurred by Landlord to update its current architectural plans for the
Building.  Tenant agrees specifically that no food, soft drink or other vending
machine will be installed within the Leased Premises without the prior written
consent of Landlord.

         (e)     All alterations, physical additions, or improvements in or to
the Leased Premises (including fixtures) shall, when made, become the property
of Landlord and shall be surrendered to Landlord upon termination of this
Lease, whether by lapse of time or otherwise; provided, however, this clause
shall  not apply to moveable equipment or furniture owned by Tenant.

         (f)     Tenant shall indemnify and hold harmless Landlord from and
against all costs (including attorneys' fees and costs of suit), losses,
liabilities, or causes of action arising out of or relating to any alterations,
additions or improvements made by Tenant to the Leased Premises, including but
not limited to any mechanics' or materialmen's liens asserted in connection
therewith.

         (g)     Tenant shall not be deemed to be the agent or representative
of Landlord in making any such alterations, physical additions or improvements
to the Leased Premises, and shall have no right, power or authority to encumber
any interest in the Complex in connection therewith other than Tenant's
leasehold estate under this Lease.  However, should any mechanics' or other
liens be filed against any portion of the Complex or any interest therein
(other than Tenant's leasehold estate hereunder) by reason of Tenant's acts or
omissions or because of a claim against Tenant or its contractors, Tenant shall
cause the same to be cancelled or discharged by record of bond or otherwise
within ten (10) days after notice by Landlord.  If Tenant shall fail to cancel
or discharge said lien or liens, within said ten (10) day period, which failure
shall be deemed to be a default hereunder, Landlord may, at its sole option and
in addition to any other remedy of Landlord hereunder, cancel or discharge the
same and upon Landlord's demand, Tenant shall promptly reimburse Landlord for
all costs incurred in cancelling or discharging such lien or liens.

         (h)     NOTWITHSTANDING THE FOREGOING OR ANY OTHER PROVISION HEREIN TO
THE CONTRARY, TENANT WAIVES THE IMPLIED WARRANTY OF SUITABILITY.

         3.04.   Repair and Maintenance by Landlord.  Landlord shall not be
required to make any improvements or repairs of any kind or character to the
Leased Premises or the Complex, except





                                       9
<PAGE>   11
such repairs as may be required to the Building corridors and lobbies and
structural members of the Building, and such repairs as may be deemed necessary
solely by Landlord for normal maintenance operations for the Complex (see
Article 3 Landlord's Services).  This Section 3.04 shall not apply in the case
of damage or destruction by fire or other casualty (as to which Section 5.02
shall apply), or damage resulting from an eminent domain taking (as to which
Section 5.01 shall apply).

                         ARTICLE 4  TENANT'S COVENANTS

         4.01.   Payments by Tenant.  Tenant agrees to timely pay the Rent and
all rents and sums provided to be paid to Landlord hereunder at the times and
in the manner herein provided and to at all times occupy and conduct business
in the Leased Premises.

         4.02.  Certain Taxes.  Tenant shall pay all ad valorem taxes on all
improvements installed in the Leased Premises that are in excess of those
installed by Landlord from time to time as Building Standard or in excess of
the items to be installed by Landlord at Landlord's cost under Exhibit "C" or
specified in the Section 3.03(a) hereof.

         4.03.   Repairs by Tenant.  Tenant shall, at its cost, repair or
replace any damage to the Building, or any part thereof, caused by Tenant or
Tenant's agents, employees, invitees or visitors; provided if Tenant fails to
make such repairs or replacements promptly, Landlord may, at its option, make
such repairs or replacements and the cost thereof shall be payable by Tenant on
demand as a part of The Rent hereunder, and failure of Tenant to pay such costs
within ten (10) days shall constitute a failure to pay Rent when due and an
Event of Default by Tenant hereunder.

         4.04.   Care of the Leased Premises.  Tenant shall maintain the Leased
Premises in a clean, attractive condition, and not commit or allow any waste or
damage to be committed on or to any portion of the Leased Premises, and at the
expiration or termination of this Lease shall deliver up the Leased Premises to
Landlord in as good condition as at date of possession by Tenant, ordinary wear
and tear excepted.

         4.05.   Tenant Floor Plans.  Tenant shall cooperate with Landlord in
the preparation of space plans and working drawings ("Space Plans") for the
Leased Premises as specified in Exhibit "C." Within fifteen (15) days after
Landlord delivers the Space Plans to Tenant, Tenant shall deliver to Landlord
Tenant's written approval of the Space Plans together with any and all changes
to the Space Plans requested by Tenant.  Additionally, within said fifteen (15)
day period, Tenant shall deliver to Landlord any and all plans and
specifications of additional work for the Leased Premises requested by Tenant
(Tenant's Plans), as further specified in Exhibit "C." Should Tenant fail to
deliver Tenant's approval of the Space Plans and the Tenant's Plans for
additional improvements within said fifteen (15) day period, Tenant shall pay
to Landlord one day's Base Rental for each day's delay in such delivery.  Upon
receipt of Tenant's approval of the Space Plans and receipt of the Tenant's
Plans, Landlord will partition and prepare the Leased Premises in accordance
therewith.  However, Landlord shall not be required to install any





                                       10
<PAGE>   12
partitions or improvements to the Leased Premises which exceed the tenant
finish items and work specified in Exhibit "C" or which are not otherwise
approved by Landlord.  Tenant may, at Tenant's expense, order changes in the
Tenant's Plans prior to or during construction with the prior consent of
Landlord.  However, any delay in completion of the Leased Premises caused by
changes in the Tenant's Plans ordered by Tenant shall not delay the
Commencement Date as further provided in Section 3.03(c) hereof.

         4.06    Assignment or Sublease.

         (a)     Tenant shall not assign this Lease or Sublease the Leased
Premises or any part thereof or mortgage, pledge or hypothecate its leasehold
interest or grant any concession or license within the Leased Premises (any
such assignment, Sublease, mortgage, pledge, hypothecation, or grant of a
concession or license being hereinafter referred to in this Section 4.06 as a
"Transfer") without the prior express written permission of Landlord, and any
attempt to effect a transfer without such permission of Landlord shall be void
and of no effect.  Tenant acknowledges that any assignment or sublease is also
subject to the prior written consent of any Landlord's Mortgagee (as defined in
Section 4.10).  In order for Tenant to make a Transfer, Tenant must request in
writing Landlord's permission within at least sixty (60) days in advance of the
date on which Tenant desires to make a Transfer, after which Landlord shall
then have a period of thirty (30) days following receipt of such notice within
which to notify Tenant in writing that Landlord elects (i) to terminate this
Lease as to the space so affected as of the date so specified by Tenant in
which event Tenant will be relieved of all further obligations hereunder as to
such space, (ii) to permit Tenant to assign or sublet such space, subject,
however, to prior written approval of the proposed assignee or Sublessee by
Landlord, or (iii) to refuse consent to Tenant's requested transfer and to
continue this Lease in full force and effect as to the entire Leased Premises.
If Landlord shall fail to notify Tenant in writing of such election within said
thirty (30) day period, Landlord shall be deemed to have elected option (iii)
above.  If Landlord elects to exercise option (ii) above, Tenant agrees to
provide at its expense, direct access from any sublet space or concession area
to a public corridor of the Building.  The prohibition against a Transfer
contained herein shall be construed to include a prohibition against any
Transfer by operation of law.

         (b)     Notwithstanding that the prior express written permission of
Landlord to a Transfer may have been obtained under the provisions of Section
4.06(a), the following shall apply:

                 (1)      In the event of an assignment or Sublease, Tenant
shall (i) cause the assignee or Sublessee to expressly assume in writing and to
agree to perform all of the covenants, duties and obligations of Tenant
hereunder, and such assignee or Sublessee shall be jointly and severally liable
therefor along with Tenant; (ii) cause such assignee or Sublessee to grant
Landlord an express first and prior contract lien and security interest in the
same manner as the lien granted by Tenant to Landlord under Section 5.03
hereof; (iii) subordinate to Landlord's statutory lien and the aforesaid
contract lien and security interest any liens or other rights which Tenant may
claim with respect to any fixtures, equipment, goods, merchandise or other
property owned by or leased to the proposed assignee or Sublessee or other
party intending to occupy the





                                       11
<PAGE>   13
Leased Premises; and (iv) agree with Landlord that in the event that the rent
or other consideration due and payable by a Sublessee or assignee under any
such permitted Sublease or assignment exceeds the Rent for the portion of the
Leased Premises so transferred, then Tenant shall pay Landlord as additional
rental hereunder all such excess rental and other consideration immediately
upon receipt thereof by Tenant from such transferee.

                 (2)      A signed counterpart of all instruments relative to a
Transfer (executed by all parties to such transaction with the exception of
Landlord) shall be submitted by Tenant to Landlord prior to or
contemporaneously with the request for Landlord's written consent thereto (it
being understood that no such instrument shall be effective without the written
consent of Landlord);

                 (3)      No usage of the Leased Premises different from the
usage herein provided to be made by Tenant shall be permitted, and all of the
terms and provisions of this Lease shall continue to apply after a Transfer;
and

                 (4)      In any case where Landlord consents to a Transfer,
Tenant will nevertheless remain directly and primarily liable for the
performance of all the covenants, duties and obligations of Tenant hereunder
(including, without limitation, the obligation to pay all Rent herein provided
to be paid), and Landlord shall be permitted to enforce the provisions of this
Lease against the undersigned Tenant or any transferee, or both, without demand
upon or proceeding in any way against any other persons.

         (c)     If Tenant is a corporation then any transfer of this Lease by
merger, consolidation or dissolution or any change in ownership or power to
vote a majority of the voting stock in Tenant outstanding at the time of
execution of this Lease shall constitute a Transfer for the purposes of this
Lease; provided, however, that acquisition of all stock of a corporate Tenant
by any corporation, the stock of which is registered pursuant to the Securities
Act of 1933 or the merger of a corporate Tenant into such a corporation, the
stock of which is so registered, shall not be deemed to be a violation of
Section 4.06(a).  For purposes of this Section 4.06(c), the term "voting stock"
shall refer to shares of stock regularly entitled to vote for the election of
directors of the corporation involved.

         (d)     If Tenant is a general partnership having one or more
corporations as partners or if Tenant is a limited partnership having one or
more corporations as general partners, the provisions of Section 4.06(c) shall
apply to each of such corporations as if such corporations alone had been the
Tenant hereunder.  If Tenant is a general or limited partnership, joint
venture, or other form of association, the transfer of a majority of the
ownership interests therein shall constitute a Transfer for the purposes of
this Lease.

         (e)     The consent by Landlord to a particular Transfer shall not be
deemed a consent to any other subsequent Transfer.  If this Lease, the Leased
Premises or the Tenant's leasehold interest therein, or if any portion of the
foregoing is transferred, or if the Leased Premises are occupied in whole or in
part by anyone other than Tenant without the prior consent of Landlord





                                       12
<PAGE>   14
as provided herein, Landlord may nevertheless collect rent from the transferee
or other occupant and apply the net amount collected to the Rent payable
hereunder, but no such transaction or collection of rent or application thereof
by Landlord shall be deemed a waiver of the provisions hereof or a release of
Tenant from the further performance by Tenant of its covenants, duties and
obligations hereunder.

         4.07.   Alterations, Additions, Improvements.  Tenant will make no
alteration, change, improvement, repair, replacement or addition to the Leased
Premises without the prior written consent of Landlord.  Tenant may remove its
trade fixtures, office supplies and movable office furniture and equipment not
attached to the Building provided (i) such removal is made prior to the
termination or expiration of the Term; (ii) Tenant is not then in default in
the timely performance of any obligation or covenant under this Lease; and
(iii) Tenant promptly repairs all damage caused by such removal.  All other
property and the Leased Premises and any alteration or addition to the Leased
Premises and any other articles attached or affixed to the floor, wall, or
ceiling of the Leased Premises is a part of the property of Landlord and shall
be surrendered with the Leased Premises as part thereof at the termination or
expiration of this Lease, without payment or compensation therefor.  If,
however, Landlord so requests in writing, Tenant will, prior to termination or
expiration of this Lease, remove any and all alterations, additions, fixtures,
equipment and property placed or installed by Tenant or installed by Landlord
at Tenant's expense in the Leased Premises and will repair any damage caused by
such removal.

         4.08.   Compliance with Laws and Usage; Liens.  Tenant, at its cost,
shall comply with all federal, state, municipal and other laws and ordinances
applicable to the Leased Premises and the business conducted therein by Tenant,
and with the Building Rules and Regulations; will not engage in any activity
which would cause landlord's fire and extended coverage insurance to be
cancelled or the rate thereof to be increased (or, at Landlord's option, will
pay any such increase); and will not commit any act which is a nuisance or
annoyance to Landlord or to other tenants in the Building or which might, in
the exclusive judgment of Landlord, appreciably damage Landlord's goodwill or
reputation, or tend to injure or depreciate the value of the Complex.  Tenant
has no authority to encumber the Complex or Leased Premises with any lien, and
Tenant shall not suffer or permit any such lien to exist.  Should any such lien
hereafter be filed, Tenant shall promptly discharge the same at its sole cost.

         4.09.   Access by Landlord.  Tenant shall permit Landlord or its
agents or representatives to enter into and upon any part of the Leased
Premises at all reasonable hours to inspect same; to clean; to make repairs,
alterations or additions thereto, as Landlord may deem necessary or desirable;
to show the Leased Premises to prospective purchasers or tenants; or for any
other purpose deemed reasonable by Landlord; and Tenant shall not be entitled
to any abatement or reduction or Rent by reason thereof.

         4.10.   Landlord's Mortgagee.  Tenant agrees with Landlord and with
the Mortgagee of any mortgage or the beneficiary of any Deed of Trust now or
hereafter constituting a lien on the Complex or the Leased Premises
("Landlord's Mortgagee") that any Landlord's Mortgagee shall have the right at
any time to elect, by notice in writing given to Tenant, to make this Lease





                                       13
<PAGE>   15
superior to the lien of such mortgage or Deed of Trust and upon the giving of
such notice to Tenant, this Lease shall be deemed prior and superior to the
mortgage or Deed of Trust in respect to which such notice is given; and at
Landlord's Mortgagee's request Tenant shall execute a recordable instrument
establishing this Lease as superior to such lien; or Landlord's Mortgagee may,
by like notice, make this Lease subordinate to such mortgage or Deed of Trust.
If Landlord's Mortgagee shall elect to make this Lease subordinate to such
mortgage or Deed of Trust, the same shall be self-operative and no further
certificate or instrument of subordination need be required by any Mortgagee.
In confirmation of such subordination, however, Tenant shall execute promptly
any reasonable certificate or instrument that Landlord may request.  Tenant
further agrees that any Landlord's Mortgagee, without notice Tenant, may demand
the payment of Rent and performance of this Lease at any time.  Tenant hereby
constitutes Landlord as Tenant's attorney-in-fact to execute such certificate
or instrument for and on behalf of Tenant.  In the event of the enforcement by
Landlord's Mortgagee of the remedies provided for by law or by such mortgage or
Deed of Trust, Tenant will, upon request of any person or party succeeding to
the interest of Landlord as a result of such enforcement, automatically become
the Tenant of such successor in interest without change in terms or other
provisions of such Lease provided, however, that such successor in interest
shall not be (i) bound by any payment of Rent for more than one month in
advance except payments in the nature of security for the performance by Tenant
of its obligations under this Lease; (ii) subject to any offset, defense or
damages arising out of a default or any obligations any preceding Landlord; or
(iii) bound by any amendment or modification of this Lease made without the
written consent of such Trustee or such beneficiary or such successor in
interest.  Upon request by such successor in interest, Tenant shall execute and
deliver reasonable instruments confirming the attornment provided for herein.

         4.11.   Estoppel Certificate.  At Landlord's request from time to
time, Tenant will promptly, without further consideration, execute an Estoppel
Certificate addressed to Landlord's Mortgagee or to such party as Landlord may
designate certifying to such notice provisions and other matters as Landlord's
Mortgagee or as the other party designated by Landlord may reasonably request.
At Landlord's request from time to time, Tenant will promptly execute, without
further consideration, a certificate stating the commencement and expiration
dates of the Term, the rental then payable hereunder, that there are no
defaults on the part of Landlord or claims against Landlord hereunder (or if
there are any, stating the same with particularity), and such other information
pertaining to this Lease as Landlord may reasonably request, addressed to such
party as Landlord may designate.

                           ARTICLE 5 MUTUAL COVENANTS

         5.01    Condemnation, Loss or Damage.  If the Leased Premises,
Building, or any part thereof shall be taken or condemned for any public
purpose (or conveyed in lieu or in settlement thereof) to such an extent as to
render the remainder of the Building or Leased Premises, in the opinion of
Landlord, not reasonably suitable for occupancy, this Lease shall, at the
option of either party, forthwith cease and terminate, and all proceeds from
any taking or condemnation of the Building and the Leased Premises shall belong
to and be paid to Landlord.  If this Lease is not so terminated, Landlord shall
repair any damage resulting from such taking, to the extent





                                       14
<PAGE>   16
and in the manner provided in Section 5.02, and Base Rental hereunder shall be
abated to the extent the Leased Premises are rendered untenantable during the
period of repair and thereafter be adjusted on an equitable basis considering
the areas of the leased Premises taken and remaining.

         5.02    Fire or Other Casualty; Certain Repairs.

         (a)     In the event of a fire or other casualty in the Leased
Premises, Tenant shall immediately give notice thereof to Landlord.  If the
Leased Premises shall be partially destroyed by fire or other casualty so as to
render the Leased Premises untenantable in whole or in part in the opinion of
Landlord, the Base Rental provided for herein shall abate as to the portion of
the Leased Premises rendered untenantable until such time as the Leased
Premises are made tenantable as determined by Landlord and Landlord agrees to
commence and prosecute such repair work promptly and with reasonable diligence,
or if such destruction results in the Leased Premises being untenantable in
substantial part for a period reasonably estimated by Landlord to be six (6)
months or longer after Landlord's insurance settlement, or in the event of
total or substantial damage or destruction of the Building where Landlord
decides not to rebuild, then all Rent owed up to the date of such damage or
destruction shall be paid by Tenant and this Lease shall terminate upon notice
thereof to Tenant.  Landlord shall give Tenant written notice of its decisions,
estimates or elections under this Section 5.02 within sixty (60) days after any
such damage or destruction.

         (b)     Should Landlord elect to effect any repairs under Sections
5.01 or 5.02(a), Landlord shall only be obligated to restore or rebuild the
Leased Premises to a Building Standard condition, and then only to the extent
that insurance proceeds are actually available to Landlord therefor.  In the
event the Base Rental or any portion of the Base Rental is abated under
Sections 5.01 or 5.02(a), the expiration date of the Term specified in Section
1.02 shall be extended for the period of such abatement.

         5.03.   Security Interest.  In consideration for the mutual benefits
arising under this Lease, and as security for Tenant's performance of all its
obligations under this Lease, Tenant hereby grants to Landlord a lien and
security interest in and on all property of Tenant now or hereafter placed in
or upon the Leased Premises, and such property shall be and remain subject to
such lien and security interest of Landlord for payment of all Rent and other
sums agreed to be paid by Tenant herein.  The provisions of this Section 5.03
shall constitute a security agreement under the Texas Uniform Commercial Code
so that Landlord shall have and may enforce a security interest on all property
of Tenant now or hereafter placed in or on the Leased Premises, including but
not limited to all fixtures, machinery, equipment, furnishings and other
articles of personal property now or hereafter placed in or upon the Leased
Premises by Tenant.  Landlord may at its election at any time file a copy of
this Lease as a financing statement.  Landlord, as secured party, shall be
entitled to all of the rights and remedies afforded to a secured party under
the Texas Uniform Commercial Code, which rights and remedies shall be in
addition to and cumulative to the Landlord's liens and rights provided by law
or by the other terms and provisions of this Lease.  Promptly upon request, and
without further consideration, Tenant agrees





                                       15
<PAGE>   17
to execute as debtor such additional financing statement or statements as
Landlord may now or hereafter reasonably request in order that Landlord's
security interests may be protected pursuant to the Texas Uniform Commercial
Code.  Unless otherwise provided by law and for the purpose of exercising any
right pursuant to this Section, Landlord and Tenant agree that reasonable
notice shall be met if such notice is given by ten (10) days' written notice,
certified mail, return receipt requested, to Landlord or Tenant at the
addresses for notice specified herein.

         5.04.   Holding Over.  If Tenant should remain in possession of the
Leased Premises after the termination or expiration of the Term without the
execution by Landlord and Tenant of a new lease, then Tenant shall be deemed to
be occupying the Leased Premises as a tenant-at-sufferance, subject to all the
covenants and obligations of this Lease, except that the daily Rent shall be
twice the per day Rent in effect immediately prior to such expiration or
termination, but such holding over shall not extend the Term.

         5.05.   Assignment by Landlord.  Landlord shall have the right to
transfer and assign, in whole or in part, all its rights and obligations
hereunder and in the Building and property referred to herein, and upon any
such transfer of assignment, no further liability or obligation shall
thereafter accrue against Landlord hereunder.

         5.06.   Recourse Limitation.  Tenant specifically agrees to look
solely to Landlord's interest in the Building for the recovery of any judgment
from Landlord, it being agreed that Landlord shall  never be personally liable
for any such judgment.  The provision contained in the foregoing sentence shall
not limit any right that Tenant might otherwise have to obtain injunctive
relief against Landlord, or any other action not involving the liability of
Landlord to respond in monetary damages from assets other than Landlord's
interest in the Building.

         5.07.   Control of Common Areas and Parking Facilities by Landlord.
All automobile parking areas including (without limitation), the Garage,
driveways, entrances and exits thereto, and other facilities furnished by
Landlord, including all parking areas, truck way or ways, loading areas,
pedestrian walkways, ramps, landscaped areas, stairways and other areas and
improvements provided by Landlord for the general use, in common, of tenants,
their officers, agents, employees, invitees, licensees, visitors and customers
shall be at all times subject to the exclusive control and management of
Landlord, and Landlord shall have the right from time to time to establish,
modify and enforce reasonable rules and regulations (herein called the
"Building Rules and Regulations") with respect to all facilities and areas
mentioned in this Section; the initial Building Rules and Regulations are set
out in Exhibit "D"  hereto and are of equal dignity herewith.

         5.08.   Default by Tenant.

         (a)     Each of the following occurrences relative to Tenant shall
constitute an "Event of Default:"





                                       16
<PAGE>   18
                 (1)      Failure or refusal of Tenant to make the timely
payment of any Rent payable under this Lease when and as the same shall become
due and payable;

                 (2)      Failure of Tenant to occupy and conduct business in,
or the abandonment or vacating of the Leased Premises or any significant
portion thereof;

                 (3)      The filing or execution or occurrence of a petition
in bankruptcy or other insolvency proceeding by or against Tenant or any
guarantor of Tenant's obligations hereunder; or petition or answer seeking
relief under any provision of the Bankruptcy Act; or as assignment for the
benefit of creditors or composition; or a petition or other proceeding by or
against the Tenant for the appointment of a trustee, receiver or liquidator of
Tenant or any of Tenant's property; or a proceeding by any governmental
authority for the dissolution or liquidation of Tenant or any guarantor of
Tenant;

                 (4)      Failure by Tenant in the performance or compliance
with any of the agreements, terms, covenants or conditions provided in this
Lease, other than those referred to in (1), (2) or (3) above, for a period of
ten (10) days after notice from Landlord to Tenant specifying the items in
default; or

                 (5)      The occurrence of any other event herein provided to 
be an Event of Default.

         (b)     This Lease and the Term and estate hereby made are subject to
the limitation that if and whenever any Event of Default shall occur, Landlord
may, at its option and without further written notice to Tenant, in addition to
all other remedies given hereunder or by law or equity, do any one or more of
the following:

                 (1)      Terminate this Lease, in which event Tenant shall
immediately surrender possession of the Leased Premises to Landlord;

                 (2)      Enter upon and take possession of the Leased Premises
and expel or remove Tenant and any other occupant therefrom with or without
having terminated the Lease; and

                 (3)      Apply all or any portion of the Security Deposit to
cure such Event of Default; and

                 (4)      Without any prior notice to Tenant, alter locks and
other security devices at the Leased Premises so that Tenant will not have
access to the Leased Premises.  Landlord may take these actions without
incurring any liability and without relinquishing Landlord's right to Rent or
any other right given to Landlord hereunder or by operation of law; Tenant
hereby waiving any right to claim damage for such re-entry expulsion.





                                       17
<PAGE>   19
         (c)     Any right to receive notice of Landlord's intent to exercise
any of the remedies for an Event of Default is hereby waived.  Any right to
cure before Landlord may exercise any of the remedies for an Event of Default
is hereby waived.

         (d)     Exercise by Landlord of any one or more remedies shall not
constitute an acceptance of surrender of the Leased Premises by Tenant, it
being understood that such surrender can be effected only by the written
agreement of the Landlord and Tenant, with the prior written consent of any
Landlord's Mortgagee (as defined in Section 4.10).

         (e)     If Landlord terminates this Lease by reason of an Event of
Default, Tenant shall pay to Landlord the sum of all Rent and other
indebtedness accrued hereunder to the date of such termination, the amounts
stated in Section 5.08(g) hereof, plus, as liquidated damages, an amount equal
to the then present value of the Rent and all other indebtedness as would
otherwise have been required to be paid by Tenant to Landlord during the period
following the termination of the Term measured from the date of such
termination to the date of expiration stated in section 1.02, less the then
present fair market rental value of the Leased Premises for such period;
because of the difficulty of ascertaining the fair market rental value of the
Leased Premises and the costs and time associated with reletting the Leased
Premises, the Landlord and Tenant stipulate that such fair market rental value
shall in no event be deemed to exceed seventy-five percent (75%) of the then
present value of the Rent reserved for such period.

         (f)     If Landlord repossesses the Leased Premises without
terminating the Lease, then Tenant shall pay to Landlord all Rent and other
indebtedness accrued to the date of such repossession, plus Rent and other sums
required to be paid by Tenant during the remainder of the Term, diminished by
any net sums thereafter received by Landlord through reletting the Leased
Premises during said period (after deducting expenses incurred by Landlord as
provided below); reentry by Landlord will not affect the obligations of Tenant
for the unexpired Term.  Tenant shall not be entitled to any excess of any Rent
obtained by reletting over the Rent herein reserved.  Actions to collect
amounts due by Tenant may be brought on one or more occasions, without the
necessity of Landlord's waiting until expiration of the Term.

         (g)     In case of an Event of Default, to the extent the same were
not paid or deducted, as appropriate, under Section 5.08(e) or (f), Tenant
shall also pay to Landlord: (i) broker's fees incurred by Landlord in
connection with reletting the whole or any part of the Leased Premises; (ii)
the cost of removing and storing Tenant's or any other occupant's property;
(iii) and the cost of repairing, altering, remodeling or otherwise putting the
Leased Premises into condition acceptable to a new tenant or tenants; and (iv)
all reasonable expenses incurred by Landlord in enforcing Landlord's remedies,
including reasonable attorney's fees and court costs.

         (h)     Upon termination or repossession of the Leased Premises for an
Event of Default, Landlord shall not be obligated to relet or attempt to relet
the Leased Premises, or any portion thereof, or to collect rental after
reletting, but Landlord shall have the option to relet or attempt to relet.  In
the event of reletting, Landlord may relet the whole or any portion of the
Leased Premises for any period, to any tenant, and for any use and purpose.





                                       18
<PAGE>   20
         (i)     If Tenant should fail to make any payment, perform any
obligation, or cure any default hereunder, Landlord, without obligation to do
so and without thereby waiving such failure or default, may make such payment,
perform such obligation, and/or remedy such other default for the account of
Tenant (and enter the Lease Premises for such purpose), and Tenant shall pay
upon demand all costs, expenses and disbursements (including reasonable
attorneys' fees) incurred by Landlord in taking such remedial action, plus
interest thereon at the highest rate of interest permitted by law.

         5.09.   Right to Relocate.  Notwithstanding anything herein to the
contrary, Landlord shall in all cases retain the right and power to relocate
Tenant within the Building in space which is comparable in size and location
and suited to Tenant's use, such right and power to be exercised reasonably and
such relocation to be made at Landlord's sole cost and expense.  Landlord shall
not be liable or responsible for any claims, damages, or liabilities in
connection with or occasioned by such relocation.  Landlord's reasonable
exercise of such right and power shall include, but shall in no way be limited
to, a relocation to consolidate the rentable area occupied in order to provide
Landlord services more efficiently, or a relocation to provide contiguous
vacant space for a prospective tenant.

         5.10.   Non-Waiver.  Neither acceptance of rent by Landlord nor
failure by Landlord to complain of any action, non-action or default of Tenant
shall constitute a waiver of any of Landlord's rights hereunder.  Waiver by
Landlord of any right for any default of Tenant shall not constitute a waiver
of any right for either a subsequent default of the same obligation or any
other default.

         5.11.   Independent Obligations.  The obligation of Tenant to pay all
Rent and other sums hereunder provided to be paid by Tenant and the obligation
of Tenant to perform Tenant's other covenants and duties hereunder constitute
independent unconditional obligations to be performed at all times provided for
hereunder, save and except only when an abatement thereof or reduction therein
is hereinabove expressly provided for and not otherwise.  Tenant waives and
relinquishes all rights which Tenant might have to claim any nature of lien
against or withhold, or deduct from or offset against any Rent and other sums
provided hereunder to be paid Landlord by Tenant.

         5.12    Time of Essence.  In all instances where any act is required
at a particular indicated time or within an indicated period, it is understood
and stipulated that time is of the essence.

         5.13.   Remedies Cumulative.  Landlord may restrain or enjoin any
breach or threatened breach of any covenant, duty or obligation of Tenant
herein contained without the necessity of proving the inadequacy of any legal
remedy or irreparable harm.  The remedies of Landlord hereunder shall be deemed
cumulative and no remedy of Landlord, whether exercised by Landlord or not,
shall be deemed to be in exclusion of any other.





                                       19
<PAGE>   21
         5.14.  Insurance, Subrogation, Liability, Indemnity, and Waiver.

         (a)     Tenant shall maintain at its sole expense fire and extended
coverage insurance with vandalism and malicious mischief endorsements and a
sprinkler leakage endorsement (where applicable), on all of its personal
property, including removable trade fixtures, located in the Leased Premises
and on non-Building Standard leasehold improvement and all additions and
improvements made by Tenant.

         (b)     Tenant shall, at its sole expense, maintain in effect at all
times comprehensive general liability insurance, including contractual
liability coverage, naming Landlord as an additional insured, issued by and
binding upon some solvent insurance company authorized to do business in Texas
and satisfactory to Landlord, with bodily injury limits of not less than
$100,000 for each occurrence and $300,000 in the aggregate and property damage
liability limits of not less than $100,000 for each occurrence and $300,000 in
the aggregate.  Tenant shall provide to Landlord (i) copies of such insurance
policies prior to the Commencement Date of the Term, (ii) certificates of
renewal at least thirty (30) days prior to the expiration date of any such
policies, and (iii) copies of new policies at least thirty (30) days prior to
terminating, or changing insurance companies for, any such policies.

         (c)     Anything herein to the contrary notwithstanding each party
hereto hereby releases and waives all claims, rights of recovery and causes of
action that either party or any party claiming by, through or under such party
by subrogation or otherwise may now or hereafter have against the other party
or any of the other party's partners, directors, officers, employees or agents
for any loss or damage that may occur to the Complex, Leased Premises, Tenant
improvements or any of the contents of any of the foregoing by reason of fire
or other casualty, or any other cause except gross negligence or willful
misconduct (but including negligence of the parties hereto or their partners,
directors, officers, employees, or agents) that could have been insured against
under the terms of (i) any standard fire and extended coverage insurance
policies required under the terms of this Lease, or (ii) any other loss covered
by insurance required to be maintained under the terms of this Lease; provided,
however, that this waiver shall be ineffective against any insurer of Landlord
or Tenant to the extent that such waiver (i) is prohibited by the laws and
insurance regulations of the State of Texas or (ii) would invalidate any
insurance coverage of Landlord or Tenant.  The waiver set forth in this Section
5.14(c) shall not apply to any deductibles on policies carried by Landlord nor
to any coinsurance penalty which Landlord might sustain.

         (d)     Except for any of the claims, rights of recovery and causes of
action that Landlord has released and waived pursuant to Section 5.14(c),
Tenant hereby releases, indemnifies, defends, and holds harmless Landlord and
Landlord's partners, agents, directors, officers, employees, invitees and
contractors, from all claims, losses, costs, damages or expenses (including,
but not limited to, attorneys' fees) resulting or arising from any and all
injuries or death of any person or damage to any property occurring during the
Term caused or alleged to have been caused by any act, omission, or neglect of
Tenant or Tenant's directors, officers, employees, agents, invitees or guests,
or any parties contracting with Tenant relating to the Leased Premises.





                                       20
<PAGE>   22
         (e)     Tenant and Landlord agree that each shall not be responsible
or liable to the other or to their agents, customers or invitees, for bodily
injury (fatal or non-fatal) or property damage occasioned by the acts or
omissions of any other tenant or such tenant's employees, agents, contractors,
customers or invitees within the Complex, or for any loss or damage to any
property or persons occasioned by theft, fire act of God, public enemy,
injunction, riot, strike, insurrection, war, court order, requisition or order
of governmental body or authority, or any other cause beyond the control of
either party, or for any inconvenience or loss to either party in connection
with any of the repair, maintenance, damage, destruction, restoration or
replacement referred to in this Lease.

         5.15.   Venue; Governing Law.  This Lease shall be governed by the
laws of the State of Texas.  All monetary and other obligations of Landlord and
Tenant are performable exclusively in Houston, Harris County, Texas.

         5.16.   Notice.  Any notice which may or shall be given under the
terms of this Lease shall be in writing and shall be either delivered by hand
or sent by United States Registered or Certified Mail, postage prepaid, if for
Landlord to 11200 WESTHEIMER, SUITE #507, HOUSTON, TEXAS 77042; or if for
Tenant (i) prior to the Commencement Date to 11200 WESTHEIMER, SUITE #410,
HOUSTON, TEXAS 77042 or (ii) subsequent to the Commencement Date to the Leased
Premises.  Such addresses may be changed from time to time by either party by
giving notice as provided above.  Notice shall be deemed given when delivered
(if delivered by hand) or when postmarked (if sent by mail).

         5.17.   Entire Agreement, Binding Effect, Severability.  This Lease
and any written addenda and all exhibits hereto (which are expressly
incorporated herein by this reference) shall constitute the entire agreement
between Landlord and Tenant; no prior written or prior or contemporaneous oral
promises or representations shall be binding.  This Lease shall not be amended,
changed or extended except by written instrument signed by both parties hereto.
The provisions of this Lease shall be binding upon and inure to the benefit of
the heirs, executors, administrators, successors and assigns of the parties,
but this provision shall in no way alter the restrictions on assignment and
subletting applicable to Tenant hereunder.  If any provision of this Lease or
the application thereof to any person or circumstance shall at any time or to
any extent be held invalid or unenforceable, and the basis of the bargain
between the parties hereto is not destroyed or rendered ineffective thereby,
the remainder of the Lease or the application of such provision to person or
circumstances other than those as to which it is held invalid or unenforceable
shall not be affected thereby.

         5.18.   Right of Reentry.  Upon the expiration or termination of the
Term for whatever cause, Landlord shall have the right to immediately reenter
and reassume possession of the Leased Premises and remove Tenant's property
therefrom, and Tenant expressly acknowledges such right.

         5.19.   Number and Gender; Captions; References.  Pronouns, where used
herein, of whatever gender, shall include natural persons, corporations, and
associations of every kind and





                                       21
<PAGE>   23
character, and the singular shall include the plural and vice versa where and
as often as may be appropriate.  Article and section headings under this Lease
are for convenience of reference and shall not affect the construction or
interpretation of this Lease.  Whenever the terms "hereof," "hereby," "herein,"
or words of similar import are used in this Lease, they shall be construed as
referring to this Lease in its entirety rather than to a particular section or
provision, unless the context specifically indicates to the contrary.  Any
reference to a particular "Article" or "Section" shall be construed as
referring to the indicated article or section of this Lease.

         5.20    Delinquent Payments; Handling Charge.  Any payments required
of Tenant hereunder, whether as Rent or otherwise, shall bear interest from the
time due until paid at the maximum rate of interest permitted by law.
Furthermore, should Tenant fail to timely pay any installment of Rent
hereunder, Landlord shall have the option to charge Tenant, as additional Rent
hereunder, a fee equal to five percent (5%) of the delinquent installment to
reimburse Landlord for its cost and inconvenience incurred in dealing with
Tenant's delinquent payment.  In no event, however, shall the charges imposed
under this Section 5.20 and elsewhere in this Lease, to the extent the same are
considered to be interest under applicable law, exceed the maximum rate of
interest allowable under applicable law.

         5.21.   Quiet Enjoyment.  Tenant, on paying all sums herein called for
and performing and observing all of its covenants and agreements hereunder,
shall and may peaceably and quietly have, hold, occupy, use, and enjoy the
Leased Premises during the Term subject to the provisions of this Lease and
applicable governmental laws, rules, and regulations; and Landlord agrees to
warrant and forever defend Tenant's right to such occupancy against the claims
of any and all persons whomsoever lawfully claiming the same or any part
thereof, by, through, or under Landlord, but not otherwise, subject only to the
provisions of this Lease and all applicable governmental laws, rules, and
regulations.

         5.22.   Signs.  No signs, symbols or identifying marks shall be placed
in or upon the Complex, in the halls, elevators, staircases, entrances, or
exterior of the Building or Garage, or upon the doors or walls of the Leased
Premises without prior written approval of Landlord.  Landlord agrees to
provide and install, at Tenant's cost, all letters or numerals on doors in the
Leased Premises.  All such letters and numerals shall be in the Building
Standard graphics, and no others shall be used or permitted on the Leased
Premises without written permission from Landlord.

         5.23.   Cancellation Option.  Subject to the condition that Tenant
shall not at such time be in Default of the Terms or provisions of the Lease,
then Tenant (but not any assignee of Tenant or subtenant) shall have a one-time
right to cancel said Lease effective at the end of the thirty-ninth (39th)
month of the initial term, upon the fulfillment of the following conditions:

                 (1)      the Tenant has given Landlord written notice not
                          later than expiration of month thirty-three (33) of
                          the Lease Term;





                                       22
<PAGE>   24
                 (2)      that Tenant shall pay as stipulated damages all
                          unamortized contributions by Landlord proposed
                          herein, including but not limited to leasehold
                          improvement allowances, commissions,
                          architectural/MEP allowances, to the extent such
                          allowances are utilized by Tenant, and unamortized
                          value of three (3) months of rental.  Payment of said
                          penalty and stipulated damages shall be due
                          simultaneous with Tenant's notice to cancel the
                          Lease.  For purposes of calculating such stipulated
                          damages, the exact amount of Landlord's expenditures
                          shall be treated as if such is a loan, fully
                          amortized over the Lease Term at ten percent (10%)
                          annual interest computed monthly.

         EXECUTED in multiple counterparts, each of which shall have the force
and effect of an original on the date first above written.

                                        PINCAY OAKS, INC.


                                        By: /s/ KEN L. HATFIELD
                                           ------------------------------------
                                        Name:   KEN L. HATFIELD                 
                                             ----------------------------------
                                        Title:  VICE-PRESIDENT                  
                                              ---------------------------------
                                                         "LANDLORD"

                                        HORIZON EXPLORATION, LIMITED


                                        By:                                    
                                           ------------------------------------
                                        Name:                                  
                                             ----------------------------------
                                        Title:                                 
                                              ---------------------------------
                                                         "TENANT"


[Signature page to Lease Agreement dated                 , 1994 between PINCAY
OAKS, INC., as Landlord and HORIZON EXPLORATION, LIMITED, as Tenant.]





                                       23
<PAGE>   25
                                  EXHIBIT "A"





                                [MAP NOT SHOWN]
<PAGE>   26
                                  EXHIBIT "B"

                               LEGAL DESCRIPTION 
                             11200 WESTHEIMER ROAD

A tract of land containing 126,290 Square Feet, 2.8992 Acres which is part of a
55.2187 Acre tract conveyed to Casa Blanca Corporation of America from
Westheimer-Hayes Co., Ltd., a Limited Partnership, by Deed recorded in Volume
8267, Page 294 of the Harris County Deed Record and being out of the Fort Smith
Survey, Abstract No. 1307 in the City of Houston, Harris County, Texas, said
2.8992 Acre tract being more particularly described by Metes and Bounds as
follows: (All bearings refer to the plat of AEGEAN GARDENS as recorded in
Volume 290, Page 73, Harris County Map Records).

COMMENCING at a 3/4 inch iron pipe found at the point of intersection of the
North Line of Westheimer Road, (120 feet wide), with the East line of Hayes
Road (60 feet wide), said point also marks the Southwest corner of said 55.2187
Acre tract;

THENCE, N 89  57 min., 00 sec. E; along the North line of said Westheimer Road
and South line of said 55.2187 Acre tract, for a distance of 562.85 feet to a
5/8 inch iron rod set for the POINT OF BEGINNING and the Southwest corner of
this tract;

THENCE, N 00  08 min. 11 sec. E; for 570.41 feet on an "X" set in concrete for
the Northwest corner of this tract and lying on the South line of said Aegean
Gardens as a recorded in Volume 290, Page 73 of the Map Records of Harris
County;

THENCE, East, along the South line of said Aegean Gardens for 218.00 feet to a
5/8 inch iron rod set for the Northeast corner of this tract;

THENCE, S 00  08 min. 11 sec. W; along the East line of said 55.2187 Acre tract
for 579.22 feet to a 5/8 inch iron rod set for the Southeast corner of this
tract and lying on the North right-of-way line of said Westheimer Road;

THENCE, S 89  57 min. 00 sec. W; along the North right-of-way line of said
Westheimer Road and the South line of said 55.2187 Acre tract for 218.00 feet
to the POINT OF BEGINNING; and being the same property particularly described
in Deed dated September 11, 1981, from Monzer Hourani, Trustee to the insured
herein.
<PAGE>   27
                                  EXHIBIT "C"

         The Leased Premises shall be tendered to Tenant on an "as-is"
condition, however, Landlord will extend to Tenant an allowance, not to exceed,
Four and 50/100 Dollars ($4.50) per rentable square foot to be used for the
remodel, refurbishment, permitting, architectural services, filing of required
engineering drawings, and management supervision fee, (not to exceed five
percent (5%) of actual construction/refurbishment costs).
<PAGE>   28
                                  EXHIBIT "D"

                         BUILDING RULES AND REGULATIONS

1.       Sidewalks, doorways, vestibules, halls, stairways and other similar
         areas shall not be used for the disposal of trash, be obscured by
         tenants or to used by tenants for any purpose other than entrance to
         and exit from the Leased Premises and for going from one part of the
         Building to another part of the Building.

2.       Plumbing fixtures shall be used only for the purposes for which they
         are designed, and no sweepings, rubbish, rags or other unsuitable
         materials shall be disposed into them.  Damage resulting to any such
         fixtures from misuse by a tenant shall be the liability of said
         tenant.

3.       Signs, advertisements or notices visible in or from public corridors
         or from outside the Building shall be subject to Landlord's prior
         written approval.

4.       Movement in or out of the Building of furniture, office equipment or
         any other bulky or heavy materials shall be restricted to such hours
         as Landlord designates.  Landlord will determine the method and
         routing of said items so as to ensure the safety of all persons and
         property concerned.  Advanced written notice of intent to move such
         items must be made to the Building management office.

5.       All deliveries of furniture, office equipment or bulk freight shall be
         coordinated in advance with Landlord, shall be performed subject to
         Landlord's supervision and direction by use only of an elevator
         designated by Landlord.

6.       Building management shall have the authority to prescribe the weight
         and manner that heavy furniture and equipment are positioned.

7.       Corridor doors, when not in use, shall be kept closed.

8.       Tenant space that is visible from public areas must be kept neat and
         clean.

9.       The disposal of trash or storage of materials in the hallways,
         elevator lobbies, stairways and other common area of the Building is
         prohibited.

10.      No animals shall be brought into or kept in, on or about the Building.

11.      Tenant shall not tamper with or attempt to adjust temperature control
         thermostats in the Leased Premises.  Landlord shall adjust thermostats
         as required to maintain the Building standard temperature.





                                  PAGE 1 OF 2
<PAGE>   29
12.      Tenant will comply with any and all security procedures established by
         Landlord from time to time.

13.      Tenants shall lock all office doors leading to corridors and turn out
         all lights at the close of their working day.

14.      All requests for overtime air conditioning or heating must be
         submitted in writing to the Building management office by 2:00 p.m. on
         the day desired for weekday requests, by 2:00 p.m. Friday for weekend
         requests and by 2:00 p.m. on the preceding business day for holiday
         requests.

15.      No flammable or explosive fluids or materials shall be kept or used
         within the Building except in areas approved by Landlord, and Tenant
         shall comply with all applicable building and fire codes relating
         thereto.

         Landlord reserves the right to rescind any of these rules and
regulations and to make such other and further rules and regulations as in its
reasonable judgement shall, from time to time, be required for the safety,
protection, care and cleanliness of the Building, and the operation thereof,
the preservation of good order therein and the protection and comfort of the
tenants and their agent, employees and invitees.  Such rules and regulations,
when made and written notice thereof is given to a tenant, shall be binding
upon it in like manner as if originally herein prescribed.





                                  PAGE 2 OF 2

<PAGE>   1
                                                                   EXHIBIT 10.39


PARTICULARS

<TABLE>
____________________________________________________________________________________
<S>                                                         <C>     <C> 


1.       DATE                                               :       199

____________________________________________________________________________________

2.       PARTIES:

         A.      LANDLORD                                   :       TUSCAN PROPERTY DEVELOPMENTS
                                                                    LIMITED whose registered office is at 736
                                                                    London Road, Larkfield Kent

         B.      TENANT                                     :       HORIZON EXPLORATION LIMITED
                                                                    of 6 Pembroke Road, Sevenoaks, Kent
                                                                    TN13 1XR        
- ------------------------------------------------------------------------------------

3.       SHORT DESCRIPTION OF                                       Part of Unit 8 New Business Estate,
                                                                    Ditton, Kent
         PREMISES                                           :                       
- ------------------------------------------------------------------------------------

4.       TERM                                               :       A term of 4 years commencing on 1st
                                                                    February 1997 and expiring on 31st
                                                                    January 2001    
- ------------------------------------------------------------------------------------

5.       RENT                                               :       L.20,000 per annum
- ------------------------------------------------------------------------------------           

6.       RENT COMMENCEMENT
         DATE                                               :       1st February 1997
- ------------------------------------------------------------------------------------          

7.       PERMITTED USE                                      :       [     ] or such other use within Class [
                                                                    ] of the Schedule to the Town and Country
                                                                    Planning (Use Classes) Order 1987 as the
                                                                    Landlord shall approve in writing (such
                                                                    approval not to be unreasonably withheld)
- ------------------------------------------------------------------------------------                         
</TABLE>
<PAGE>   2
T H I S   L E A S E made B E T W E E N the Parties named in the Particulars
W I T N E S S E S as follows:
DEFINITIONS:
1        The terms defined in this clause and in the Particulars shall for the
         purposes of this Lease (unless the context otherwise requires) have
         the following meanings:
1.1      "THE BUILDING"           the building of which the Premises form part
                                  known as Unit 8 New Business Estate, Ditton,
                                  Kent together with any approach roads
                                  forecourt grounds parking areas and all
                                  boundary walls and fences
1.2      "THE COMMON PARTS"       those parts of the Building which are not
                                  included in this Lease and which are not
                                  demised to any other tenant the use and
                                  benefit of which is common to the occupants
                                  of the Building
1.3      "INSURED RISKS"          fire storm tempest explosion and such other
                                  risks (subject to excesses exclusions and
                                  limitations as the insurers may require) as
                                  the Landlord may in the Landlord's absolute
                                  discretion determine
1.4      "INTEREST"               interest during the period from the date on
                                  which the payment is due to the date of
                                  payment both before and after any judgment at
                                  the rate of 4% per annum above the base rate
                                  for the time being of National Westminster
                                  Bank plc or in the event of them ceasing to
                                  publish a base rate such other rate of
                                  interest as is in the reasonable opinion of
                                  the Landlord an equivalent rate
1.5      "THIS LEASE"             this deed and any deed or document
                                  supplemental to this deed or in variation of
                                  this deed
1.6      "PLANNING ACTS"          the Town and Country Planning Act 1990 the
                                  Planning (Listed Buildings and Conservation
                                  Areas) Act 1990 the Planning (Hazardous
                                  Substances) Act 1990 the Planning





                                                                          Page 1
<PAGE>   3
                                  (Consequential Provisions) Act 1990 the
                                  Environmental Protection Act 1990 the
                                  Planning and Compensation Act 1991 and any
                                  future or amending legislation of a similar
                                  nature
1.7      "THE PREMISES"           the property shortly described in paragraph 3
                                  of the Particulars and more particularly
                                  defined in the First Schedule which shall
                                  include all additions alterations and
                                  improvements and all landlord's fixtures and
                                  fittings at any time in or on the Premises
1.8      "RENT"                   the Rent but the term "rents" includes the
                                  rents reserved in clause 3
1.9      "SERVICE MEDIA"          all pipes drains sewers gutters watercourse
                                  wires cables ducts flues aerials cisterns
                                  tanks and all other conducting media and
                                  ancillary apparatus
1.10     "1995 ACT"               the Landlord & Tenant (Covenants) Act 1995

INTERPRETATION:
2          Where in this Lease the context so admits:
2.1.1      "THE LANDLORD" includes the reversioner for the time being
           immediately expectant on the determination of the Term
2.1.2      "ANY SUPERIOR LANDLORD" includes any person now or after the date of
           this Lease having a title to the Premises in reversion mediately or
           immediately expectant on the termination of the Landlord's title
2.1.3      "THE TENANT" includes the Tenant's successors in title
2.1.4      "THE TERM" includes not only the term granted by this Lease but also
           the period of any holding over or of any extension of the Term
           whether by statute or at common law
2.1.5      Any reference to statutes statutory instruments rules orders and
           regulations or the like include (unless otherwise stated) any future
           re-enactments or modifications thereof and those made in
           substitution or replacement of any which are repealed





                                                                          Page 2
<PAGE>   4
           and also include all instruments orders plans regulations
           permissions and directions for the time being made issued or given
           thereunder or deriving validity therefrom
2.3        Words importing one gender include the other genders
2.4        Words importing the singular include the plural and vice versa and
           where the Tenant and/or the Surety consists of two or more persons
           all covenants by the Tenant and/or the Surety (as the case may be)
           are deemed to be made by those persons jointly and severally
2.5        Words importing persons include firms companies and corporations and
           vice versa 
2.6        Any provisions in this Lease referring to the consent permission or
           approval of the Landlord shall be construed as also requiring the 
           consent approval or permission of any Superior Landlord and any 
           mortgagee of the Landlord and any Superior Landlord
2.7        (a)   All rights of entry or other rights or easements exercisable
                 by the Landlord shall extend to include any Superior Landlord
                 or persons authorized by them and their respective surveyors
                 servants contractors licensees and work people with or without
                 plant and appliances and materials
           (b)   All rights exercisable by the Tenant shall extend to include
                 all persons authorized by the Tenant and their respective
                 surveyors servants contractors licensees and work people with
                 or without plant and appliances and materials
2.8        References to "the last year of the Term" include the last year of
           the Term if the Term shall determine otherwise than by affluxion of
           time and references to "the expiration/expiry of the Term" include
           such other determination of the Term
2.9        Reference to any clause or Schedule shall mean a clause or Schedule
           of this Lease 
2.10       The details and descriptions appearing in the Particulars shall be 
           included in this Lease and form part of this Lease and in the event
           of any discrepancy between the Particulars and any other part of 
           this Lease such other part of this Lease shall prevail
2.11       The clause paragraph and Schedule headings to this Lease are deemed
           not to form any part of this Lease and shall not affect the
           interpretation of this Lease in any way





                                                                          Page 3
<PAGE>   5
2.12       References to the Landlord's election or to the Landlord having
           elected or similar references are references to an election by the
           Landlord under paragraph 2 of the Schedule 10 to the Value Added Tax
           Act 1994 (or previous legislation having similar effect) to waive
           the exemption from VAT in relation to the Premises.

DEMISE AND RENTS:

3          In consideration of the rents reserved by this Lease and of the
           covenants on the part of the Tenant contained in this Lease THE
           LANDLORD DEMISES to the Tenant the Premises TOGETHER WITH the rights
           (if any) specified in Part I of the Second Schedule  EXCEPT AND
           RESERVED unto the Landlord the rights (if any) specified in Part II
           of the Second Schedule and all rights powers and privileges
           expressed to be conferred on or reserved to the Landlord under the
           provisions of this Lease TO HOLD the Premises unto the Tenant for
           the Term SUBJECT TO all covenants restrictions and stipulations of
           whatever kind or nature which may affect or relate to the Premises
3.1        YIELDING AND PAYING during the Term
3.1.1      First the Rent specified in paragraph 5 of the Particulars such rent
           to be paid by equal quarterly payments in advance on the usual
           quarter days the first of the payments being a proportion from the
           Rent Commencement Date to the next quarter day and to be on the
           signing of this Lease
3.1.2      Secondly by way of further rent the sum equal to the amount which
           the Landlord shall from time to time pay by way of premium
           (including any premium whether in respect of the Premises or any
           other premises of the Landlord payable by reason of any act or
           omission of the Tenant or by the use whether authorized or not to
           which the Tenant puts the Premises) and by way of fees for periodic
           valuation for keeping the Premises insured such further rent to be
           paid forthwith on written demand by the Landlord
3.1.3      Thirdly as additional rent Interest payable on demand on any sum of
           whatsoever nature: 
           3.1.3.1                due from the Tenant to the Landlord (whether
                                  on rent or otherwise) which shall not be
                                  received by the Landlord within fourteen days
                                  after the sum due.
           3.1.3.2                properly or reasonably incurred by the
                                  Landlord in connection with and following
                                  some default under this Lease.





                                                                          Page 4
<PAGE>   6
TENANT COVENANTS:

4          THE TENANT COVENANTS with the Landlord:

RENTS

4.1.1      To pay the rents at the times and in the manner as provided without
           any deduction abatement or set-off whatsoever
4.1.2      If so requested by the Landlord to pay the rent by banker's order or
           other means of automatic transmission of funds to a bank or other
           financial institution and account nominated by the Landlord from
           time to time

OUTGOINGS AND SERVICES CONSUMED

4.2.1      To pay (or in the absence of a direct assessment on the Tenant to
           repay forthwith on demand to the Landlord a fair proportion of) all
           existing and future rates taxes assessments impositions and
           outgoings payable by law in respect of the Premises either by the
           owner or occupier
4.2.2      To pay (or in the absence of a direct assessment on the Tenant to
           repay forthwith on demand to the Landlord a fair proportion of) to
           the suppliers and indemnify the Landlord against all charges for
           electricity water and gas (if any) consumed in the Premises
           including any connection hiring charges and meter rents

REPAIRS

4.3.1      To repair and make good and damage caused to the Premises by the
           Tenant their employees, agents or servants under the Tenant's
           control

PLATE GLASS

4.4        To insure all plate glass at the Premises in its full reinstatement
           value against usual risks of damage or destruction and in the event
           of damage to or destruction of the plate glass to repair or replace
           the same

PERMIT ENTRY FOR REPAIR OF ADJOINING PREMISES

4.5        To permit the Landlord at reasonable times (except in emergency) to
           enter upon the Premises to execute repairs or alterations on any
           adjoining premises the Landlord making good all caused to the
           Premises

COSTS OF LANDLORD

4.6        To pay all expenses charges costs expenses and disbursement incurred
           by the Landlord or any Superior Landlord including but not limited
           to those payable to solicitors Counsel architects surveyors and
           bailiffs out of or in connection with or incidental to:





                                                                          Page 5
<PAGE>   7
4.6.1      any steps taken in contemplation of or in connection with the
           preparation and service of a notice under the Law of Property Act
           1925 Section 146 proceedings under Sections 146 or 147 of that Act
           (notwithstanding in any such case forfeiture is avoided otherwise
           than by relief granted by the Court) and in connection with every
           application for any consent made under this Lease whether or not
           consent is granted
4.6.2      the service of all notices and schedules relating to wants of repair
           of the premises whether served during or after the expiration of the
           Term
4.6.3      the collection and recovery of the rents and other money payable
           under this Lease which shall be in arrear (including the costs of
           any collection agency) or any action reasonably taken by or on
           behalf of the Landlord in order to prevent or procure the remedying
           of any breach of any covenant by the Tenant

PROHIBITIONS RELATING TO USER

4.7        Not to do or permit or suffer to be done anything in or upon the
           Premises or any part which may be or become a nuisance or annoyance
           or cause damage to the Landlord or the owners or occupiers of the
           other property in the neighborhood
4.7.1      Not to use the Premises for a sale by auction or for any noxious
           dangerous offensive or noisy trade or business or for any illegal or
           immoral act or purpose
4.7.2      Not to suspend any heavy loads from the ceilings or main structure
           of the Premises nor to overload the floors or structure of the
           Premises
4.7.3      Not to permit any oil grease poisonous or noxious substance to be
           discharged into any Service Media serving the Premises
4.7.4      Not to damage or obstruct any areas of which the Tenant may have
           rights of access

PLANNING ETC.

4.8.1      Not without the prior written consent of the Landlord (which consent
           shall not be unreasonably withheld only in so far as the application
           relates to the carrying out of alterations permitted under this
           Lease and relating to the use of the Premises specified by this
           Lease but not further or otherwise) to apply for any planning
           permission in respect of the Premises or any part and if the
           Landlord attaches any conditions to the consent the Tenant will not
           apply for any planning permission except in accordance with those
           conditions
4.8.2      At all times during the Term to comply in all respects with the
           provisions and  requirements of the Planning Acts and of all
           consents permissions conditions and obligations (if any) granted





                                                                          Page 6
<PAGE>   8
           or imposed or having effect under the Planning Acts so far as they
           respectively relate to or affect the Premises or any part or any
           operations works acts or things already or after the date of this
           Lease to be carried out executed or done or omitted on the Premises
           or the use of the Premises for any purpose
4.8.3      Not to enter into any agreement or obligation with a local planning
           authority as a result of which the Premises or any neighboring
           property of the Landlord or any Superior Landlord shall become
           subject to any restriction of user or otherwise
4.8.4      Not to object or obstruct any planning application made by the
           Landlord or on the Landlord's behalf that may affect or relate to
           the Premises or any neighboring property

ADVERTISEMENTS AND DISPLAYS

4.9        Not without the Landlord's previous consent in writing to display
           any external sign or advertisement on the Premises or any part

USER

4.10       To use the Premises only for the Permitted Use stated in paragraph 8
           of the Particulars and not to permit any person to sleep or reside
           there

ALTERATIONS OR ADDITIONS

4.11.1     Not to commit any waste make any addition to the Premises or erect
           any new building on the Premises or make any other alteration to the
           Premises or to the Service Media serving the Premises except as
           permitted by the Next sub-clause
4.11.2     Not to make internal non-structural alterations to the Premises or
           connections to the Service Media serving the Premises without the
           previous written consent of the Landlord such consent not to be
           unreasonably withheld and if the Tenant under the provisions of any
           consent given by the Landlord makes any alteration to the Premises
           the Tenant shall at the expiration of the Term (if the Landlord
           shall so require but not otherwise) at the Tenant's own expense
           restore the Premises to their former state and condition in all
           respects to the satisfaction of the Landlord

ALIENATION

4.12       Not to assign demise underlet charge or otherwise part with
           possession of any part of the Premises (here meaning a portion only
           and not the whole thereof) or to charge or share occupation of the
           whole or any part thereof for all or any part of the Term
4.12.1     Not to assign the whole of the Premises without first:-
4.12.1.1   obtaining the written license of the Lessor which shall not be
           unreasonably withheld;





                                                                          Page 7
<PAGE>   9
4.12.1.2   satisfying the circumstances specified for the purposes of Section
           19(1A) of the Landlord & Tenant Act 1927 and set out in clause
           4.12.2.1 below; and
4.12.1.3   complying the conditions specified for the purposes of Section
           19(1A) of the Landlord & Tenant Act 1927 and set out in clause
           4.12.2.2 below.
4.12.1.4   The circumstances referred to in clause 4.12.1.2 are that:-
           4.12.1.4.1     all sums due from the Lessee under this Lease have
                          been paid at the date of the application for the
                          license to assign;
           4.12.1.4.2     in the Lessor's reasonable opinion there are at the
                          date of the application for the license to assign no
                          material outstanding breaches of any tenant covenant
                          under this Lease or any personal covenants undertaken
                          by the Lessee
           4.12.1.4.3     in the Lessor's reasonable opinion the assignee is a
                          person who is at the date of the application for
                          license to assign no less likely than the Lessee was
                          at the date on which this Lease was assigned or
                          granted to the Lessee to be able to comply with the
                          tenant covenants of this Lease and is likely to
                          continue to be such a person following the
                          assignment;
4.12.1.5   The Conditions referred to in clause 4.12.1.3 are that:-
           4.12.1.5.1     upon or before any assignment and before giving
                          occupation to the assignee the Lessee shall covenant
                          by way of indemnity and guarantee with the Landlord
                          in the terms of an authorized guarantee agreement
                          under the provisions of the Act
           4.12.1.5.2     if so reasonably required by the Lessor the assignee
                          shall upon or before the assignment and before taking
                          occupation obtain guarantors reasonably acceptable to
                          the Lessor who shall covenant by way of indemnity and
                          guarantee (if more than one jointly and severally)
                          with the Lessor to guarantee the performance and
                          observance of the covenants and conditions during the
                          residue of the Term or until the expiry of the term
                          of the underlease (as the case may be) as well after
                          as before any disclaimer of this Lease or underlease
                          by a liquidator or trustee in bankruptcy of the
                          proposed assignee or underlessee and to indemnity the
                          Landlord in respect thereof the covenant to be in a
                          form prepared by the Landlord's solicitor at the cost
                          of the Tenant





                                                                          Page 8
<PAGE>   10
           4.12.1.5.3     the written license to assign contains a condition
                          that if at any time prior to the assignment the
                          circumstances (or any of them) specified in clause
                          4.12.2.1 cease to exist the Lessor may revoke the
                          license by written notice to the Lessee
4.12.2     Not to underlet the whole of the Premises save by way of an
           underlease complying with clauses 4.12.4 and 4.12.5 hereof and which
           has the prior written approval of the Lessor (such consent not to be
           unreasonably withheld in the circumstances set out in clause 4.12.3
           hereof and granted upon such reasonable conditions as the Lessor
           shall require) which underletting is hereafter referred to as a
           "Permitted Underlease"
4.12.3     Any Permitted Underlease shall be in terms approved by the Lessor's
           solicitors acting reasonably and which shall include the following
           covenants on the part of the underlessee of which the Lessee will
           thereafter enforce the performance:
4.12.3.1   An absolute covenant not to assign demise underlet or otherwise part
           with possession of the sub-demised premises (here meaning a portion
           only and not the whole thereof) or to share occupation of the whole
           or any part thereof for all or any part of the sub-term
4.12.3.2   A qualified covenant not to assign demise underlet or otherwise part
           with possession of the whole of the sub- demised premises without
           the license in writing of the Lessor (the grant of which shall be
           subject to the same provisos as hereinbefore set forth in this
           clause)
4.12.3.3   A covenant that the underlessee will cause to be inserted in every
           sub-underlease whether immediate or derivative covenants on the part
           of the relevant subunderlessee corresponding to the covenants number
           4.12.4.1 and 4.12.4.2 above and that the underlessee will at all
           times thereafter enforce the same
4.12.3.4   Provisions for rent reviews to be made on the same days as in this
           Lease 
4.12.3.5   Notwithstanding anything herein contained the Lessee shall not
           create of permit the creation of any interest derived out of the
           Term however remote or inferior upon the payment of a fine or premium
           or at a less rent than the full market rent obtainable (without
           taking a fine or premium) of the Premises and shall not create or
           permit the creation of any derivative interest as aforesaid save by
           instrument in writing containing such absolute prohibition as
           aforesaid on the part of the underlessee  and those that may derive
           title under such underlessee

LETTING AND SELLING BOARDS

4.13       At any time during the last six months of the Term to permit a
           notice board to be exhibited on a conspicuous part of the Premises
           intimating that the same are to be let or sold and during such





                                                                          Page 9
<PAGE>   11
           period to permit an inspection at any reasonable time in the day by
           or on behalf of any prospective tenant or purchaser of the Premises
           upon an appointment being made for that purpose

INSPECTION BY PURCHASERS OF REVERSION

4.14       At all times throughout the Term to permit any prospective purchaser
           of the reversion expectant on the termination of this Lease and his
           advisers to inspect the Premises at reasonable times (PROVIDED THAT
           such person shall bear a letter of authority signed by or on behalf
           of the Landlord) and to permit a notice board to be exhibited on a
           conspicuous part of the Premises intimating that the same are to be
           sold

INSURANCE

4.15       Not to do or permit or suffer to be done on the Premises anything
           which may render an increased or extra premium payable for the
           insurance of the Premises or any other premises of the Landlord or
           which may make void or voidable any policy of insurance effected in
           respect of the Premises
4.15.1     In the event of the Premises or any part being damaged or destroyed
           by any of the Insured Risks to give immediate notice to the Landlord
4.15.2     In the event of the Premises or any part being damaged or destroyed
           by any of the Insured Risks and the insurance money under any policy
           of insurance effected by the Landlord pursuant to the Landlord's
           obligations in this Lease being wholly or partly irrecoverable by
           reason solely or in part of any act or default of the Tenant then
           and in every case forthwith (in addition to the rents reserved by
           this Lease) to pay to the Landlord the whole or (as the case may be)
           the irrecoverable proportion of the amount of the insurance money so
           irrecoverable with Interest

NOT TO INSURE AGAINST LANDLORD'S RISKS

4.16       Not to insure in respect of any risks against which the Landlord has
           insured under the provisions contained in this Lease

NOT TO CAUSE OR ALLOW ANYTHING WHICH COULD EXPOSE THE LANDLORD TO PENALTIES

4.17       Not to do or omit to do or permit or suffer to be done or omitted to
           be done anything in or about the Premises or any premises used for
           the purposes of but not comprised in the Premises whereby the
           Landlord may become exposed to the liability to pay any penalty
           damages compensation costs charges or expenses





                                                                         Page 10
<PAGE>   12
REGULATIONS

4.18       To comply with all reasonable regulations made by the Landlord from
           time to time for the management of the Building

PAYMENT OF MONEY OWING

4.19       If the Tenant fails to pay to the Landlord any of the rents and/or
           other sums becoming payable by the Tenant to the Landlord pursuant
           to this Lease on the date or dates upon which the same fall due for
           payment then in addition to any rents and/or other sums to pay to
           the Landlord Interest calculated from the date or dates upon which
           the payment fell due until the date or dates of actual payment

VAT

4.20       Wherever in this Lease provision is made for the Tenant to pay any
           sum (including without prejudice to the generality of the foregoing
           the rents reserved by this Lease legal costs registration fees
           surveyors' and other professional fees charges and expenses) on
           which VAT is payable then to pay in addition to that sum VAT on that
           sum at the rate appropriate at the time of the supply

DEFECTIVE PREMISES

4.21       Forthwith upon becoming aware of the same to give notice in writing
           to the Landlord of any defect in the state of the Premises which
           might give rise to an obligation on the Landlord to do or refrain
           from doing any act or thing in order to comply with the provisions
           of this Lease or the duty of care imposed on the Landlord under the
           Defective Premises Act 1972 and at all times to display and maintain
           all necessary notices which the Landlord may from time to time
           require to be displayed at the Premises

TO YIELD UP

4.22       To yield up the Premises with all fixtures and additions at the
           expiration of the Term with vacant possession and in repair and
           decorative order and condition in accordance with the Tenant's
           covenants contained in this Lease

LANDLORD'S COVENANT

5          THE LANDLORD COVENANTS with the Tenant:

QUIET ENJOYMENT

5.1        That the Tenant paying the rents and performing and observing the
           covenants on the part of the Tenant to be performed and observed may
           peaceably enjoy the Premises during the Term





                                                                         Page 11
<PAGE>   13
           without any lawful interruption by the Landlord or any person or
           persons rightfully claiming under or in trust for the Landlord

INSURANCE

5.2.1      To keep the Premises other than any plate glass insured (unless the
           insurance is rendered void by an act or omission of the Tenant or
           persons claiming under the Tenant) against loss or damage by the
           Insured Risks so far as such insurance may ordinarily be effected
           for such amount as the Landlord shall think expedient to include
           professional fees debris removal and site clearance and the cost of
           any work which might be required by or by virtue of any Act or
           Parliament and three years' loss of rent
5.2.2      To produce to the Tenant on 14 days notice a copy of the policy of
           insurance maintained by the Landlord and the receipt for the last
           premium payable for it
5.2.3      In the event of the Premises being destroyed or damaged by any of
           the Insured Risks subject to having obtained all appropriate
           consents under the Planning Acts or otherwise to lay out money
           received by the Landlord under the policy of insurance (except money
           received in respect of loss of rent) in rebuilding or reinstating
           the Premises PROVIDED THAT the Landlord shall not be under an
           obligation to rebuild or reinstate the Premises in the form which
           existed before the date of the destruction or damage

LANDLORD'S COVENANT RELATING TO REPAIR

6          Subject to the rents being paid by the Tenant and to compliance by
           the Tenant with all the covenants and conditions in this Lease THE
           LANDLORD COVENANTS with the Tenant as follows:

REPAIR AND MAINTENANCE OF BUILDING

6.1        To maintain repair amend renew clean repaint and redecorate to a
           standard which the Landlord reasonably considers adequate: the
           structure of the Building and in particular the roof void and main
           structural walls but excluding: 
           6.1.1          all non-structural walls that are situated wholly 
                          within the Premises 
           6.1.2          the internal faces of boundary walls that enclose 
                          the Premises
           6.1.3          the windows and window frames and doors and door
                          frames of the Premises 
           6.1.4          the glass in the windows and doors of and in the 
                          Premises 
           6.1.5          the floors of the Premises (but not the floor joists)





                                                                         Page 12
<PAGE>   14
           6.1.6          the ceilings of the Premises (but not the ceilings
                          joists) 
           6.1.7          any parts of the Building which are part of the 
                          Premises and are the responsibility of the Tenant 
                          under the provisions of this Lease
           6.1.8          all portions corresponding to the foregoing in or
                          appurtenant to other tenanted parts of the Building
           6.1.9          the Common Parts

MAINTAIN SERVICES

6.2        To maintain in reasonable working order and repair:
6.2.1      all water heating system and the electric lighting appliances in the
           common parts 
6.2.2      all Service Media in under or upon the Building which shall serve 
           the Building (excluding nevertheless any which lie within the 
           Premises or exclusively serve the Premises or which are in or 
           appurtenant to other tenanted parts of the Building)

PROVISOS AGREEMENTS AND DECLARATIONS:

PROVIDED ALWAYS and it is expressly agreed and declared as follows:

7.1        RE-ENTRY
           If the rents or any part are at any time in arrear and unpaid for 14
           days after becoming due (whether formal or legal demand has been
           made or not) or if the covenants on the part of the Tenant shall not
           be performed or observed or if the Tenant or any other person in
           whom the Term shall be vested or any other person who may at any
           time covenant with the Landlord as a surety under this Lease shall
           become bankrupt or have a receiving order made against the Tenant or
           any such other person or being a company enter into liquidation
           whether compulsory or voluntary (other than for the purpose of
           amalgamation or reconstruction of a solvent company) or has a
           receiver appointed or if the goods of the Tenant or any such other
           person on the Premises shall be taken in execution then and in any
           such case it will be lawful for the Landlord to re-enter the
           Premises (or any part of the Premises in the name of the whole)
           whereupon the Term shall absolutely cease but without prejudice to
           any rights or remedies of the Landlord in respect of an antecedent
           breach of the Tenant's covenants contained in this Lease
7.2        RENT TO BE SUSPENDED IF PREMISES DAMAGED
           If the Premises or any part are at any time during the Term damaged
           or destroyed by any one or more of the Insured Risks so as to be
           unfit for occupation or use and the policy or policies





                                                                         Page 13
<PAGE>   15
           of insurance effected by the Landlord shall not have been vitiated
           or payment of the policy moneys refused in whole or in part in
           consequence of any act or default of the Tenant to the extent that
           it is insured in accordance with the provisions of this Lease the
           rent or a fair portion according to the nature and extent of the
           damage sustained shall be suspended until the Premises have been
           rendered fit for habitation and use or until the expiration of three
           years from the damage or destruction whichever is the shorter and
           any dispute regarding the cesser of rent shall be referred to the
           award of a single arbitrator to be appointed in default of agreement
           upon the application of either party by the President for the time
           being of the Royal Institution of Chartered Surveyors in accordance
           with the Arbitrations Act of 1950 to 1979
7.3        TERMINATION ON DESTRUCTION
           If the Premises are at any time during the Term destroyed or
           substantially damaged by any of the Insured Risks so as to be unfit
           for occupation and use and the Premises have not been rebuilt or
           reinstated or made fit for occupation and use within two years nine
           months after the date of destruction or damage either the Landlord
           or the Tenant (unless the insurance of the Premises shall have
           become vitiated or the payment of policy money refused in whole or
           part by any neglect default or omission of the Tenant or the
           Tenant's agents employees licensees or visitors) may serve not less
           than three months' notice in writing to determine this Lease such
           notice to expire not earlier than three years after the date of the
           destruction or damage and if upon the expiration of such notice the
           Premises remain unfit for occupation and use then this Lease shall
           absolutely determine (or if the rebuilding or reinstatement of the
           Premises shall be prevented or frustrated by any cause whatsoever)
           the Landlord shall not be liable to rebuild or reinstate the
           Premises and the insurance money received by the Landlord in respect
           of the Premises and the loss of rent shall belong to the Landlord
           absolutely
7.4        SERVICE OF NOTICES
           A demand for payment notice or other document required or authorized
           to be served or given under this Lease shall be in writing and shall
           only be deemed to be sufficiently served: 
           7.4.1          in the case of service on the Tenant if posted in an
                          envelope addressed to the Tenant by first class
                          registered or recorded delivery post at the Premises
                          or (if the Tenant is a company)  at the Tenant's
                          registered office as appears in this Lease or as last
                          notified in writing to the Landlord (the Tenant to
                          give notification to the Landlord as soon as
                          practicable after change of address of the Tenant's





                                                                         Page 14
<PAGE>   16
                          registered office) or as revealed as being the
                          Tenant's current registered office by a company
                          search (whether or not notified to the Landlord) or
                          (whether or not the Tenant is a company) if left upon
                          or attached to the Premises or some part and
           7.4.2          in the case of service on the Landlord if posted by
                          first class registered or recorded delivery post in
                          an envelope addressed to the Landlord at the
                          Landlord's registered office (if any) or at any other
                          address which the Tenant may have previously been
                          notified in writing by the Landlord as the address at
                          which the Landlord will accept service of notices
           PROVIDED THAT in the case of service by post service shall be deemed
           to have been effected 24 hours after posting (excluding any
           intervening Saturdays Sundays or bank or other public holiday)

COMPENSATION

7.5        Subject to the provisions of the Landlord and Tenant Act 1954
           Section 38(2) neither the Tenant nor any assignee or transferee or
           underlessee shall be entitled on quitting the Premises to any
           compensation under the Landlord and Tenant Act 1954 Section 37

DISPUTES

7.6        Any dispute between the Tenant and any owner or occupier of adjacent
           or neighboring property (other than the Landlord) as to any right or
           privilege or any party or other walls or as to the amount of any
           contribution towards the expenses of services used in common shall
           be decided by the Landlord or in such manner as the Landlord shall
           direct and such decision shall be binding on the parties to the
           dispute

AGREEMENT FOR LEASE

8          It is hereby certified that there is no Agreement giving effect to
           this Lease

                               THE FIRST SCHEDULE

                          DESCRIPTION OF THE PREMISES

ALL THOSE premises comprising Part of Unit 8 New Business Estate, Ditton, Kent
edged red on the plan annexed and being part of the Building including: 1.1
all walls situated wholly within the Premises but not external load bearing or
structural walls or supports 1.2        the internal plaster decorative or
other finishes of all external walls





                                                                         Page 15
<PAGE>   17
1.3        the floors and floor finishes but not any joists or beams supporting
           the floors 
1.4        the ceilings and the decorative finishes applied to the ceilings but
           not the beams or joists or other structural parts of the Building to
           which the ceilings are affixed PROVIDED ALWAYS that where there are
           suspended ceilings the Premises include not only the whole of the 
           suspended ceiling and their supporting grids but also the permanent
           ceilings above the void between
1.5        the inner halves severed medially of all internal non-structural
           walls dividing the Premises from any adjoining part of the Building
1.6        the windows and window frames and the doors and door frames
           (including external doors) in and to the Premises and all glass in
           those windows and doors

                              THE SECOND SCHEDULE

                                     PART 1

     RIGHTS GRANTED TO THE TENANT (IN COMMON WITH THE LANDLORD AND THOSE 
                          AUTHORIZED BY THE LANDLORD)

1          the right to pass on foot over and along any common or shared
           entrance halls passages corridors stairs landings and lifts in the
           Building
2          The right to use the Common Parts for all proper purposes in
           connection with the use and enjoyment of the Premises
3          The right to the free passage and running of water soil gas
           electricity telecommunications and any other usual services to and
           from the Premises through the Service Media serving the Building
4          Such rights of support and protection (whether lateral subjacent or
           otherwise) for the Premises as are now enjoyed from other parts of
           the Building
5          The right to have the Tenant's name displayed in a manner to be
           determined from time to time by the Landlord on any notice board in
           the entrance hall of the Building or on any signs which may be
           maintained from time to time at any point adjacent to the approaches
           of the Building giving the names and locations of occupants of the
           Building





                                                                         Page 16
<PAGE>   18
                                    PART II

EXCEPTIONS AND RESERVATIONS (IN FAVOR OF THE LANDLORD AND THE TENANTS AND
                   OCCUPIERS OF OTHER PARTS OF THE BUILDING)

1          The right at any time during the Term at all reasonable times upon
           prior notice (except in the case of emergency) to enter the
           Premises:
1.1        To enable the Landlord to carry out work or otherwise comply with
           the Landlord's obligations under this Lease (whether or not the
           Tenant is liable to make a contribution)
1.2        to exercise any of the rights granted to the Landlord by this Lease
1.3        to inspect the state and condition of the Premises or to take
           schedules or inventories of fixtures and other items to be yielded
           up on on the expiry of the Term
1.4        to view the state and condition of and repair and maintain the
           Building or any adjoining or adjacent property of the Landlord
2          The right to the free passage and running of water soil gas
           electricity telecommunications and any other usual services to and
           from any other parts of the Building through the Service Media now
           or at any time during the Term in through or under the Premises
3          The right to build rebuild or execute any other works upon any
           adjoining or adjacent property of the Landlord in such manner as the
           Landlord may think fit notwithstanding any interference or
           obstruction with the amenity of access to the Premises or the
           passage of light and air to the Premises
4          The right to erect scaffolding for the purpose of repairing or
           cleaning the exterior of the Building notwithstanding that the
           scaffolding may temporarily interfere with the access to or
           enjoyment and use the Premises
5          All necessary rights of support and protection (whether lateral
           subjacent or otherwise) by or from the Premises for the remainder of
           the Building


Signed as a Deed by HORIZON EXPLORATION           )

LIMITED acting by its Director and Secretary      )

                                                        Director

                                                        Secretary





                                                                         Page 17

<PAGE>   1

                                                                 EXHIBIT 10.40

THIS SET-OFF AND CHARGE is made on the date set out on the Schedule BETWEEN THE
CUSTOMER of the one part and THE BANK of the other part

NOW IT IS WITNESSED:

1.        Definitions

The Customer:                The Customer described in the Schedule and so that
                             where the Customer includes more than one person
                             or corporate body the term "the Customer" shall be
                             construed as referring to all or any one or more
                             of those persons or corporate bodies and the
                             obligations of the Customer shall be joint and
                             several

The Bank:                    The Bank of N.T. Butterfield & Son Limited,
                             incorporated in Bermuda with limited liability and
                             having its London Branch Office at 24 Chiswell
                             Street London EC1Y 4TY and where the context
                             admits the term "the Bank" includes its successors
                             and assigns whether immediate or derivative

The Account:                 The Account described in the Schedule and so that
                             where the Account includes more than one account
                             the term "the Account" shall be construed as
                             referring to all or any one of those accounts and
                             so as to include all monies in whatever currency
                             now and from time to time and at any time standing
                             to the credit of the Customer in the Account

Interest Rate:               Save where otherwise agreed in writing by the
                             parties hereto the usual rate of interest of the
                             Bank in dealing with current accounts payable on
                             such days as the Bank may from time to time
                             determine and compounded in the event of it not
                             being punctually paid with monthly, quarterly or
                             other periodic rests as the Bank shall deem fit
                             (but without prejudice to the right of the Bank to
                             require payment of such interest) and in the
                             absence of manifest error the certificate of an
                             authorized officer of the Bank shall be conclusive
                             as to the rate from time to time applicable

The Liabilities:             All monies and liabilities now and from time to
                             time and at any time due, owing or incurred to the
                             Bank by the Customer as mentioned in clause 5.1 be
                             they present, future, actual, contingent, primary,
                             collateral, several or joint

2.        Consideration

          In consideration of the Bank's making or continuing advances or
otherwise giving time or credit or affording banking facilities or
accommodation to the Customer for so long as it may think fit at the request of
the Customer (which request is now repeated and confirmed) the Customer has
agreed to enter into this Set-Off and Charge and to provide the charge and
other assurances to the Bank which are set out in detail in the following
clauses.
<PAGE>   2
3.        The Set-Off

3.1       The Customer irrevocably authorizes the Bank from time to time and at
          any time without prior notice to or any consent from the Customer:

          3.1.1          to set-off and apply all or any part of the monies in
                         whatever currency standing to the credit of the
                         Account to or towards the discharge of the whole or
                         any part of the Liabilities and/or

          3.1.2          to combine and consolidate all or any of the accounts
                         within the definition of "the Account" among
                         themselves and/or with any other account or accounts
                         maintained by the Bank in the name of the Customer
                         wherever they are situated and in whatever currency

3.2       The authority granted by the Customer to the Bank under clause 3.1
          applies at all times whether or not a demand has been made by the
          Bank to the Customer for the discharge of all or any part of the
          Liabilities

3.3       Where any monies held to the credit of the Account are held on
          deposit for an unexpired period the authority granted by the Customer
          to the Bank under clause 3.1 entitles the Bank:

          3.3.1          to withdraw and terminate that deposit prior to the
                         agreed maturity date and

          3.3.2          to charge to the Customer all costs related to that
                         early termination together with any early withdrawal
                         charge made by the Bank

3.4       Where the expression "the Customer" includes more than one person or
          corporate body any combination or transfer of monies contemplated by
          clause 3.1 may be made from any account in the name of one or more of
          such persons or corporate bodies to any account in the name of the
          Customer and where such combination or transfer requires the
          conversion of one currency into another such conversion shall be
          calculated at the then prevailing spot rate of exchange of the Bank
          (as conclusively determined by the Bank) for purchasing the currency
          for which the Customer is liable with the existing currency so
          converted

3.5       For the purposes of this clause the Liabilities and each and every
          part of them shall become immediately due and payable without the
          need for any demand notice or action of any kind on the part of the
          Bank if any of the following events occur:

          3.5.1          Upon the occurrence of any event of default as
                         specified in any other agreement between the parties
                         whether or not a demand pursuant to clause 5.1 or
                         otherwise has been made by the Bank or upon lawful
                         demand being made by the Bank for payment of any money
                         or the performance of any obligation or discharge of
                         any liability hereby secured whether or not the
                         Customer shall have been accorded sufficient time or
                         any time in which to satisfy the demand made or

          3.5.2          If any other security granted by the Customer whether
                         to the Bank or to any other person or corporate body
                         shall become enforceable or





                                       2
<PAGE>   3
          3.5.3          Upon the Customer's inability to pay debts within the
                         meaning of sections 123 and/or 268 of the Insolvency
                         Act 1986 or any statutory modification or re-enactment
                         thereof or

          3.5.4          If the Customer enters or proposes to enter into a
                         composition or arrangement with creditors or

          3.5.5          If a petition is presented for the making of an order
                         for (or a resolution is passed proposing) the winding
                         up of the Customer (if a corporate body) or the
                         bankruptcy of the Customer (if an individual) or

          3.5.6          If an encumbrancer takes possession of any asset of
                         the Customer or

          3.5.7          If a petition is presented for the making of an
                         administration order pursuant to section 8 of the
                         Insolvency Act 1986 (if the Customer is a corporate
                         body) or

          3.5.8          If an application is made for garnishee order nisi in
                         respect of any moneys standing to the credit of the
                         Account or

          3.5.9          If there is any breach by the Customer of any of the
                         terms of this Set-Off and Charge

          3.5.10         If any judgment is taken against or enforced against
                         the Customer

          3.5.11         If any occurrence analogous to the foregoing occurs in
                         any jurisdiction

3.6       When the Liabilities have become due and payable in accordance with
          the provisions of clause 3.5 then (without prejudice to the Bank's
          rights under clause 3.1) the Bank may exercise all rights of set-off
          under clause 3.1 and if the Bank does not do so then (unless the Bank
          gives express notice to the contrary to the Customer) it shall
          nevertheless be treated as if it had done so at the time when the
          Liabilities became due and payable (event if the Bank was then
          unaware of that fact) and as from that time the balance in the
          Account shall be deemed to be nil or such larger sum (if any) as
          shall then equal the difference between the amount then standing to
          the credit of the Customer in the Account and the aggregate of all
          the Liabilities

4.        The Charge

The Customer as beneficial owner HEREBY CHARGES by way of first fixed charge
and releases to the Bank as a continuing security for the discharge of all the
Liabilities the Account and all the right, title, benefit and interest of the
Customer whatsoever present and future therein together with any certificates
of deposit, deposit receipts or other instruments or securities relating
thereto to the intent that such charge shall operate as a release of the
Account to the Bank until all the Liabilities have been discharged





                                       3
<PAGE>   4
5.        Customer's Covenants

The Customer COVENANTS with the Bank:

5.1       ON DEMAND (save where otherwise agreed in writing between the parties
          hereto) to pay to the Bank all money and discharge all obligations
          and liabilities which now are or at any time hereafter may be due,
          owing or incurred from or by the Customer to the Bank or for which
          the Customer may be or become liable to it in whatever currency
          denominated on any current or other account or in any manner whatever
          (whether alone or jointly with any other person or corporate body and
          in whatever style or form and whether as principal or surety)
          including (without prejudice to the generality of the above) all
          liabilities in connection with foreign exchange transactions and for
          accepting endorsing or discounting any notes or bills and/or under
          bonds, guarantees, indemnities, documentary or other credits or any
          instruments whatsoever from time to time entered into by the Bank for
          or at the request of the Customer or for any other matter or thing
          whatsoever including interest to the date of repayment (calculated at
          the Interest Rate and payable as well after as before judgment or the
          death, insanity, insolvency or other incapacity of the Customer)
          commission, fees and other charges and all legal and other costs,
          charges and expenses on a full indemnity basis together with any
          Value Added Tax at the applicable rate which may be or become due in
          respect of all or any such matters

5.2       Not to deal with the Account or any part thereof (whether by way of
          assignment or the creation of a charge or other security interest or
          otherwise) nor attempt so to do nor without the prior written consent
          of the Bank to make or attempt to make any withdrawal from the
          Account until:

          5.2.1          all the Liabilities have been discharged

          5.2.2          the Bank is no longer obliged to extend and no longer
                         extends any financial accommodation to the Customer

          5.2.3          any agreed notice of withdrawal has been given

5.3       If so required by the Bank at any time and from time to time (save
          where otherwise agreed in writing between the parties hereto) to add
          to the Account such other monies standing to the credit of any other
          account or accounts as the Bank shall designate

5.4       At any time if and when required by the Bank to provide such
          instructions and authorities in favor of the Bank or otherwise in
          such form as the Bank shall require and to execute such further
          charges, assignments or agreements in favor of the Bank as the Bank
          shall from time to time require over the Account to secure the
          Liabilities such further charges, assignments or agreements to be
          prepared by or on behalf of the Bank at the cost of the Customer and
          to contain such clauses for the benefit of the Bank as the Bank may
          reasonably require

6.        The Bank's Rights

The Bank may at all times without prejudice to this Set-Off and Charge and
without discharging or in any way affecting the Liabilities:

6.1       determine vary or increase any credit or facilities to the Customer
          in any manner whatsoever





                                       4
<PAGE>   5
6.2       grant to the Customer or to any other person or corporate body any
          time indulgence or other concession

6.3       renew determine vary or increase any bills, notes or other negotiable
          securities

6.4       deal with exchange release modify renew vary or abstain from taking,
          perfecting or enforcing any securities or other guarantees or rights
          available or which the Bank may now or hereafter have from or against
          the Customer or any other person or corporate body

6.5       compound with discharge or release the Customer or any other person
          or corporate body and concur in accepting or varying any compromise,
          arrangement or settlement

6.6       agree with the Customer at any time as to the application of any
          advance made or to be made to the Customer

6.7       release compound with discharge or modify the liability of any person
          or corporate body included in the expression "the Customer" or make
          any other arrangements with such person or corporate body as the Bank
          may decide

6.8       assign any or all of the Bank's rights and powers under this Set-Off
          and Charge to any other person or corporate body

6.9       effect any change in the constitution of the Bank or be party to or
          the subject of any transaction involving its absorption in or
          amalgamation with any other corporate body or the acquisition of all
          or part of its undertaking by any other corporate body

7.        Consents and Notices

7.1       Any consent to be given by the Bank hereunder may be given by writing
          under the hand of an authorized officer of the Bank

7.2       A demand for payment or any other demand or notice under this Set-Off
          and Charge shall be effective notwithstanding the death insanity
          insolvency or other incapacity of the Customer and shall be made or
          given in writing by any agent or solicitor or authorized officer of
          the Bank and (in the case of an individual) served upon the Customer
          or his personal representatives personally or delivered or sent by
          first class letter, post, cable, telex or facsimile transmission to
          the Customer or his personal representatives at his or their usual
          place of abode or place of business last known to the Bank (in the
          case of telex or facsimile transmission to the last number known to
          the Bank) or (in the case of a corporate body) served on any one of
          its directors or the company secretary or delivered or sent as
          aforesaid to its registered office or the address or place of
          business of the Customer last known to the Bank or (in either case)
          delivered or sent as aforesaid to the address of the Customer stated
          in the Schedule and a demand or notice so addressed and posted shall
          be deemed to be delivered forty-eight hours after posting and shall
          be effective notwithstanding that it be returned undelivered and in
          proving such service it shall be sufficient to prove that the notice
          or demand was properly addressed and posted and any notice or demand
          sent by cable, telex or facsimile transmission shall be deemed to
          have been served at the time of dispatch and shall be effective
          notwithstanding any incomplete or distorted transmission and in
          proving such service it shall be sufficient to provide that the
          notice or





                                       5
<PAGE>   6
          demand (if by cable) was properly addressed and dispatched or (if by
          telex or facsimile transmission) was transmitted to the correct
          number from which the correct answerback or other appropriate
          acknowledgement of receipt was obtained

7.3       In the case of the death of any person a party hereto and until
          receipt by the Bank of notice in writing of the grant of
          representation to the estate of the deceased any notice or demand by
          the Bank sent by first class letter post cable telex or facsimile
          transmission as aforesaid addressed to the deceased or to his
          personal representatives at the usual place of abode or place of
          business of the deceased last known to the Bank shall for all
          purposes be deemed a sufficient service of a notice or demand by the
          Bank on the deceased and his personal representatives and shall be as
          effectual as if the deceased were still living.

7.4       Any such notice or demand or (in the absence of manifest error) any
          certificate as to the amount at any time secured hereby shall be
          conclusive and binding upon the Customer if signed by any agent or
          solicitor or authorized officer of the Bank

8.        Continuing Security and Banking Powers

8.1       This Set-Off and Charge shall be a continuing security to the Bank
          notwithstanding the death, insanity, insolvency or other incapacity
          of the Customer and shall not be prejudiced by repayment or partial
          repayment of sums from time to time owing by the Customer to the Bank
          or by the settlement of any account and is in addition to and shall
          not merge with or otherwise prejudice or affect any contractual or
          other right or remedy or any collateral or other securities now or
          hereafter held or available for any of the moneys hereby secured
          (even if the same shall be taken without the consent or against the
          prohibition of the Customer in respect of moneys for which the
          Customer is or shall be liable as surety only) and this Set-Off and
          Charge shall not be in any way prejudiced or affected thereby or by
          the invalidity thereof or by the Bank now or hereafter dealing with
          exchanging, releasing, varying or abstaining from perfecting or
          enforcing any of the same or any rights which it may now or hereafter
          have or giving time for payment or indulgence or compounding with any
          other person liable

8.2       The Bank may from time to time give time for payment of any bill or
          bills of exchange or any promissory note or notes or any other
          security or securities which may have been discounted for or received
          in account from the Customer by the Bank or on which the Customer
          shall or may be liable as drawer or endorser or otherwise liable
          thereon as the Bank shall in its discretion think fit without in any
          manner releasing the Customer or affecting the security hereby
          created and nothing herein contained shall operate so as to merge or
          otherwise prejudice or affect any bill, note, guarantee, mortgage or
          other security which the Bank may for the time being have for any
          money or liabilities due or incurred by the Customer to the Bank or
          any right or remedy of the Bank thereunder

8.3       None of the persons or corporate bodies included in the expression
          "the Customer" shall as against the Bank be entitled to any of the
          rights or remedies legal or equitable of a surety as regards the
          indebtedness or liabilities of any of the other persons or corporate
          bodies included in the expression "the Customer"

8.4       The execution of this Set-Off and Charge by the Customer shall
          constitute an authority on the part of the Customer to the Bank to
          disclose to any bank or financial institution to whom the





                                       6
<PAGE>   7
          Bank is proposing to assign all or any of its rights hereunder or to
          offer or grant a participation in any loan secured by this Set-Off
          and Charge such information concerning the affairs of the Customer
          insofar as they relate to the Account in such manner and to such
          extent as the Bank shall from time to time deem fit

9.        Currency Clauses

9.1       All moneys received or held by the Bank under this Set-Off and Charge
          may from time to time be converted into such other currency as the
          Bank considers necessary or desirable to cover the obligations and
          liabilities, actual or contingent, of the Customer in that currency
          at the then prevailing spot rate of exchange of the Bank (as
          conclusively determined by the Bank) for purchasing the currency to
          be acquired with the existing currency

9.2       If and to the extent that the Customer fails to pay on demand any
          amount due the Bank may in its absolute discretion and without notice
          to the Customer purchase at any time thereafter so much of a currency
          as the Bank considers necessary or desirable to cover the obligations
          and liabilities of the Customer in such currency hereby secured at
          the then prevailing spot rate of exchange of the Bank (as
          conclusively determined by the Bank) for purchasing such currency
          with sterling and the Customer hereby agrees to indemnify the Bank
          against the full sterling price (including all costs, charges and
          expenses) paid by the Bank

9.3       No payment to the Bank (whether under any judgment or court order or
          otherwise) shall discharge the obligation or liability of the
          Customer in respect of which it was made unless and until the Bank
          shall have received payment in full in the currency in which such
          obligation or liability was incurred and to the extent that the
          amount of any such payment shall on actual conversion into such
          currency fall short of such obligation or liability expressed in that
          currency the Bank shall have a further separate cause of action
          against the Customer and shall be entitled to enforce the security
          hereby created to recover the amount of the shortfall

10.       Power of Attorney

10.1      As security for the covenants hereinbefore contained and in
          consideration of the Bank making available or continuing to make
          available banking facilities to the Customer the Customer, hereby
          irrevocably during the continuance in force of this security appoints
          the Bank and the persons deriving title under the Bank, any person
          nominated in writing under the hand of an officer of the Bank or any
          successor in title severally to be the attorney of the Customer, for
          the Customer and in the Customer's name and on the Customer's behalf
          to execute, seal and deliver or otherwise perfect any deed or other
          instrument or act which may be required or deemed proper for any of
          the purposes of this security (including any authority or other
          charge assignment or agreement referred to in clause 5.4) or to
          protect the interest of the Bank hereunder and this appointment shall
          operate as general power of attorney under section 10 of the Powers
          of Attorney Act 1971

10.2      The Customer hereby covenants with the Bank and its successors in
          title that on request the Customer will ratify and confirm all
          security agreements, documents, acts and things and all transactions
          entered into by the Bank or by the Customer at the instance of the
          Bank in the exercise or purported exercise of its powers and the
          Customer irrevocably acknowledges and





                                       7
<PAGE>   8
          agrees that such power of attorney be inter alia given to secure the
          performance of the obligations owed to the Bank by the Customer

11.       Miscellaneous

11.1      No failure or delay by the Bank in exercising any right or remedy
          shall operate as a waiver thereof nor shall any single or any partial
          exercise or waiver of any right or remedy preclude its further
          exercise or the exercise of any other right or remedy

11.2      The security given to the Bank pursuant to this Set-Off and Charge
          shall extend to all the Liabilities whether or not the Bank was an
          original party to the relevant transaction or transactions by virtue
          of which the Liabilities or any part may from time to time arise

11.3      Each of the provisions of this Set-Off and Charge is severable and
          distinct from the others and if at any time one or more of such
          provisions is or becomes invalid, illegal or unenforceable the
          validity, legality and enforceability of the remaining provisions
          hereof shall not in any way be affected or impaired thereby

11.4      Each person and corporate body included in the expression "the
          Customer" agrees to be bound by this Set-Off and Charge
          notwithstanding that any other such person or corporate body intended
          to execute or be bound may not do so or be effectually bound and
          notwithstanding that this Set-Off and Charge may be determined or
          become invalid or unenforceable against any one or more such persons
          or corporate bodies whether or not the deficiency is known to the
          Bank

12.       Warranty and Undertaking

12.1      The Customer hereby represents and warrants that the Customer has
          full power, authority and legal right to give and to observe the
          terms and conditions of this Set-Off and Charge and that there is no
          provision in the memorandum or articles of association or any other
          constitutional document of any corporate body included in the
          expression "the Customer" or in any other corporate document,
          mortgage, indenture, trust, deed or any other agreement binding upon
          the Customer or affecting the Customer which would inhibit or prevent
          the Customer from entering into the obligations set out in this
          Set-Off and Charge or prevent conflict with or affect the Customer's
          performance or observance of any of the terms of this Set-Off and
          Charge

12.2      The Customer hereby undertakes to the Bank that the Customer will
          obtain and maintain in full force and effect all governmental and
          other approvals and consents and do or cause to be done all other
          acts and things necessary or desirable in connection herewith or for
          the performance of the Customer's obligations hereunder.

13.       Proper Law and Jurisdiction

13.1      This Set-Off and Charge shall be governed by and construed in
          accordance with the Law of England and Wales and the Customer hereby
          irrevocably submits to the non-exclusive jurisdiction of the Courts
          in England and Wales

13.2      Without prejudice to the generality of the provisions of sections 695
          and 725 of the Companies Act 1985 and the Rules of the Supreme Court
          for the time being the Customer hereby





                                       8
<PAGE>   9
          irrevocably authorizes and appoints the solicitors named in the
          Schedule (or such other person being a firm of solicitors resident in
          England or Wales as the Customer may by notice to the Bank
          substitute) to accept service of all legal process arising out of or
          connected with this Set-Off and Charge and service on those
          solicitors (or such substitute) shall be deemed to be service on the
          Customer

14.       Headings and Interpretation

14.1      The subject headings are for information only and shall not affect
          the construction or effect of this Set-Off and Charge

14.2      Words importing the masculine gender only include the feminine gender
          and words importing the singular number may include the plural number
          and vice versa

14.3      Words denoting or referring to a natural person shall include a body
          corporate and vice versa

14.4      Any reference to a statute includes any amendment or reenactment of
          it for the time being in force

IN WITNESS whereof the Customer has executed this Set-Off and Charge as a deed
on the date shown in the Schedule

The Common Seal of
Horizon Exploration Ltd
was hereunto affixed in the
presence of:

                         Director:  /s/ G.M. Harrison

                         Directors:  /s/ George Purdie


Signed, Sealed and Delivered
by the Said
in the presence of:

Witness Name:  /s/ [illegible signature]
Address:


Occupation:  Secretary





                                       9

<PAGE>   1

                                                                           10.41

DATED 25th August 1993




                          MARLEY WATERPROOFING LIMITED


                                      and


                          HORIZON EXPLORATION LIMITED





                                      DEED

                                  relating to
                        6 Pembroke Road  Sevenoaks  Kent





                            Thomson Nell & Passmore
                               3 Lonsdale Gardens
                                TUNBRIDGE WELLS
                                  Kent TN1 1NX
                                  259/0054/mb
<PAGE>   2
THIS DEED is made 25th August 1993

BETWEEN:

(1)      The Landlord             :        MARLEY WATERPROOFING LIMITED whose
                                           registered office is at London Road
                                           Riverhead  Sevenoaks  Kent TN13 2DS

(2)      The Tenant               :        HORIZON EXPLORATION LIMITED whose
                                           registered office is at Napier House
                                           14-16 Mount Ephraim Road  Tunbridge
                                           Wells  Kent

N O W THIS DEED W I T N E S S E T H as follows:

1.       DEFINITIONS AND INTERPRETATION

1.1              Definitions:

                 In this Deed the following expressions have the following
                 meanings:

                 (a)      "THE LEASE" means the Lease short particulars of
                          which are set out in the Schedule

                 (b)      "THE TERM" and "RENT" shall carry the meanings
                          ascribed to them by the Lease

                 (c)      "THE LANDLORD'S SOLICITORS" means Thomson Snell &
                          Passmore of 3 Lonsdale Gardens  Tunbridge Wells  Kent
                          TN1 1NX (Ref. 59)

                 (d)      "THE BANK" means Midland Bank plc of 86 High Street
                          Tunbridge Wells  Kent

                 (e)      "THE SECURITY DEPOSIT" means the sum of L.48,420

                 (f)      "THE DEPOSIT ACCOUNT" means the interest earning
                          deposit account opened by the Landlord's Solicitors
                          at the Bank on or before the date of this Deed and in
                          which the Landlord's Solicitors placed the Security
                          Deposit

                 (g)      "THE BANK MANDATE" means the landlord's Solicitors'
                          letter to the Bank referring to the arrangements
                          pursuant to this Deed an agreed draft of which is
                          annexed





                                       2
<PAGE>   3
1.2              Interpretation

                 Where in this Deed the context so admits:

                 (a)      words importing one gender include all other genders
                          and words importing the singular include the plural
                          and vice versa

                 (b)      the expressions "the Landlord" and "the Tenant" shall
                          include their respective successors in title and
                          assigns

                 (c)      where for the time being there are two or more
                          persons within the meaning of the expressions "the
                          Landlord" or "the Tenant" obligations expressed or
                          implied and made or to be made by or with that party
                          shall be made by or with those persons jointly and
                          severally

                 (d)      the clause headings to this Deed are for reference
                          purposes only and shall not affect the interpretation
                          of this Deed in any way.

2.       RECITALS

2.1              This Deed is supplemental to the Lease

2.2              The reversion immediately expectant on the term of years
                 granted by the Lease is vested in the Landlord

2.3              The Landlord agreed to enter into the Lease on the condition
                 that the Tenant would deposit with the Landlord's Solicitors
                 the Security Deposit and enter into this Deed

3.       PAYMENT OF SECURITY DEPOSIT

         The Tenant has on or before the date of this Deed deposited with the
         landlord's Solicitors the Security Deposit as security for payment of
         rents reserved by and other sums due to the Landlord pursuant to the
         Lease and the Landlord and the Tenant irrevocably instruct the
         Landlord's Solicitors in the operation of the Deposit Account in
         accordance with this Deed and in particular:

                 (a)      the making of payments into the Deposit Account





                                       3
<PAGE>   4
                 (b)      the withdrawal of sums from the Deposit Account and

                 (c)      accounting to the Landlord and the Tenant for money
                          due to either of them from the Deposit Account

4.       DEPOSIT ARRANGEMENTS

         The following provisions shall apply to the Security Deposit:

4.1              the Landlord's Solicitors shall place the Security Deposit in
                 the Deposit Account and all interest on the Security Deposit
                 shall belong to the Tenant and shall be mandated direct to the
                 Tenant after payment of any bank charges payable in respect of
                 the Deposit Account

4.2              if at any time during the term the Tenant:

                 (a)      shall have failed to have paid to the Landlord within
                          21 days of the due date for payment any part of the
                          rents and other moneys made payable by the Tenant to
                          the Landlord in accordance with the provisions of the
                          Lease then the Landlord shall be entitled to require
                          the Landlord's Solicitors to draw on so much of the
                          Security Deposit as shall be required in payment or
                          (if the Security Deposit shall be insufficient) in
                          part payment of the sums due to the Landlord under
                          the Lease or

                 (b)      if the Tenant enters into liquidation or has a
                          receiver appointed of the Tenant's assets then the
                          Landlord shall be entitled to require the Landlord's
                          Solicitors to draw such part of the Security Deposit
                          in payment of any sums due or which may become due to
                          the Landlord under the Lease

                 and shall in each case notify the Tenant in writing that it
                 has done so PROVIDED THAT the appropriation shall not be
                 deemed to e a payment of rent so as to prejudice the
                 Landlord's rights of re-entry contained in the Lease





                                       4
<PAGE>   5
4.3              upon receipt of the written notification mentioned in the
                 preceding sub-clause the Tenant shall within seven days pay to
                 the Landlord's Solicitors such sum as shall when added to the
                 moneys remaining to the credit of the Deposit Account
                 exclusive of any interest earned on those moneys equal the
                 Security Deposit and such sum together with any remaining
                 balance in the Deposit Account shall be treated as if it were
                 the Security Deposit

5.       CHARGE OF THE DEPOSIT ACCOUNT

5.1              THE TENANT WARRANTS to the Landlord that the Security Deposit
                 is free from any charge or incumbrance save as mentioned in
                 clause 5.2

5.2              The Tenant as beneficial owner CHARGES in favour of the
                 Landlord as security for the obligations on the part of the
                 Tenant contained in the lease and for the payment of all
                 moneys which are now or at any time may become due and payable
                 by the Tenant to the Landlord pursuant to the terms of the
                 Lease and for the due performance of all obligations and
                 liabilities (whether absolute or contingent present or future)
                 of the Tenant under the terms of the Lease the Tenant's
                 interest in the Security Deposit and all other sums from time
                 to time constituting the Security Deposit (but not including
                 any interest earned or to be earned upon the Deposit Account)
                 and any additional sum paid into the Deposit Account pursuant
                 to the provisions of sub-clause 4.3

5.3              The security created by this Deed shall constitute and be a
                 continuing security to the Landlord and shall be in addition
                 to and shall not operate so as in any way to prejudice or
                 affect the obligations of the Tenant or the rights of the

[page 4 illegible]





                                       5
<PAGE>   6
                                  THE SCHEDULE

                         Short particulars of the Lease

Lease dated 25th August 1993 relating to 6 Pembroke Road  Sevenoaks  Kent made
between the Landlord and the Tenant

THE COMMON SEAL of MARLEY         )
WATERPROOFING LIMITED was         )
affixed to this deed in the       )
the presence of:                  )



                                  Director         /s/ [illegible signature]


                                  Secretary        /s/ [illegible signature]





                                       6

<PAGE>   1
                                                                   EXHIBIT 10.42


                   THE BANK OF N.T. BUTTERFIELD & SON LIMITED


                                   DEBENTURE

                          (Fixed and Floating Charges)

                                  The Schedule

================================================================================
  Date:  30th August 199____

- --------------------------------------------------------------------------------
  Company:

  Horizon Exploration Ltd
  6 Pembroke Road
  Sevenoaks
  Kent
  TN13 1XR


- --------------------------------------------------------------------------------
  Specifically Charged

  Property:





- --------------------------------------------------------------------------------
  Loan Agreement

  Dated   12 August 1994

- --------------------------------------------------------------------------------
  Company's

  Solicitors:
================================================================================
<PAGE>   2
THIS DEBENTURE is made on the date set out in the Schedule BETWEEN:
THE COMPANY of the one part and THE BANK of the other part

NOW IT IS WITNESSED:

1.       Definitions

The Company                                The Company described in the Schedule

The Bank                                   The Bank of N.T. Butterfield & Son
                                  Limited incorporated in Bermuda with limited
                                  liability and having its London Branch Office
                                  at 24 Chiswell Street London EC1Y 4TY and
                                  where the context admits the term "the Bank"
                                  includes its successors and assigns whether
                                  immediate or derivative

The Specifically                           The freehold and/or leasehold
Charged Property                  property described in the Schedule which is
                                  specifically charged by this Debenture and
                                  where the context so admits or requires the
                                  term "the Specifically Charged Property"
                                  includes all or any part or parts thereof

The Charged Assets                         The goodwill undertaking property
                                  (including the Property defined below) assets
                                  revenues and rights of the Company charged to
                                  the Bank by this Debenture and more
                                  particularly described in clause 2.2 and
                                  where the context so admits or requires the
                                  term "Charged Assets" includes all or any
                                  part or parts thereof

The Property                               That part of the Charged Assets 
                                  (including the Specifically Charged Property)
                                  which is FIRST described in clause 2.2 and 
                                  where the context so admits or requires the
                                  term "the Property" includes all or any part
                                  or parts thereof

The Securities                             That part of the Charged Assets
                                  which is THIRDLY described in clause 2.2

The Loan Agreement                         The Loan Agreement or Facility
                                  Letter (if any) of which brief details are
                                  specified in the Schedule             

Interest Rate                              The rate of Interest specified in
                                  the Loan Agreement or where there is no Loan
                                  Agreement or the rate specified therein
                                  cannot be ascertained the usual rate of
                                  interest of the Bank in dealing with current
                                  accounts payable on such days as the Bank may
                                  from time to time determine and compounded in
                                  the event of it not being punctually paid
                                  with monthly quarterly or other periodic
                                  rests as the Bank shall deem fit (but without
                                  prejudice to the right of the Bank to require
                                  payment of such interest) and in the absence
                                  of manifest error the certificate of an
                                  authorised owner of the Bank shall be
                                  conclusive as to the rate from time to time
                                  applicable

Receiver                                   A receiver and/or manager appointed
                                  pursuant to this Debenture and/or as defined
                                  in section 29 of the Insolvency Act





                                       1
<PAGE>   3
                                  1986 and the expression "Receiver" used in
                                  this Debenture includes (where the context
                                  admits) an administrative receiver as defined
                                  in that section
                                  
2.       Fixed and Floating Charges

2.1      This Debenture is expressly made for securing present and further
         advances and as a continuing security for:-

2.1.1    all present and/or future indebtedness of the Company to the Bank on
         any account whatsoever as mentioned In clause 3.1 hereof

2.1.2    all other liabilities whatsoever of the Company to the Bank present
         future actual or contingent

2.1.3    all costs and mortgagees' or chargees' expenses arising hereunder as
         hereinafter provided together in each case with interest thereon from
         day to day from demand until full discharge (as well after as before
         judgement or the insolvency of the Company) at the Interest Rate

2.2      The Company as beneficial owner HEREBY CHARGES with the payment or
         discharge of the money obligations and liabilities specified in clause
         2.1:-

FIRST the freehold and leasehold property of the Company wherever situate both
present and future including but not limited to the Specifically Charged
Property and all buildings erections and fixtures (including trade fixtures)
and fittings from time to time on or in any such property and all rents and
other income derived from any such property or to which the Company may be or
become entitled therefrom together with the right to recover the same (by
action or otherwise) in the name of and for the account of the Company SECONDLY
all plant machinery vehicles computers and office and other equipment of the
Company both present and future (excluding stock in trade of the Company)
THIRDLY all stocks shares bonds and securities of any kind whatsoever whether
marketable or otherwise and all other interests (including but not limited to
loan capital) of the Company both present and future in any company firm
consortium or entity wheresoever situate including all allotments accretions
offers rights benefits and advantages whatsoever at any time accruing offered
or arising in respect of or incidental to the same and all stocks shares rights
money or property accruing thereto or offered at any time by way of conversion
redemption bonus preference option or otherwise in respect thereof FOURTHLY all
book and other debts revenues and claims both present and future (including
things in action which may give rise to a debt revenue or claim) due or owing
or which may become due or owing to or purchased or otherwise acquired by the
Company and the full benefit of all rights and remedies relating thereto
including but not limited to any negotiable or non-negotiable instruments
guarantees indemnities debentures legal and equitable charges and other
security and any reservation of proprietary rights rights of set-off rights of
tracing liens the benefit of any insurance proceeds and all other rights and
remedies of whatsoever nature in respect of the same FIFTHLY the uncalled
capital goodwill and connection and all patents patent applications trade marks
trade names registered designs design rights and copyrights all trade secrets
and know-how and all licenses and ancillary and connected rights relating to
the intangible property both present and future of the Company





                                       2
<PAGE>   4
SIXTHLY the undertaking and all other property assets and rights of the Company
whatsoever and wheresoever both present and future (including but not limited
to the stock in trade of the Company wheresoever) and the premises First
Secondly Thirdly Fourthly and Fifthly described (if and in so far only as the
charges thereon herein contained shall for any reason be ineffective as fixed
charges)

2.3      The charges hereby created shall as regards the Charged Assets FIRST
         SECONDLY THIRDLY FOURTHLY AND FIFTHLY described in clause 2.2 rank as
         and be FIRST FIXED CHARGES and:-

2.3.1    as regards all the Property in respect of which a legal estate is now
         vested in the Company shall constitute a charge by way of legal
         mortgage thereon and

2.3.2    as regards all the Property in respect of which a legal estate is
         vested in the Company at any future time during the continuance of
         this security shall constitute a charge by way of legal mortgage
         thereon immediately the documents of title in relation to the same are
         deposited with the Bank (without any further assurance by the Company
         or intervention by the Bank) and as to the premises SIXTHLY described
         shall be a FIRST FLOATING CHARGE (subject to clause 2.4)

2.4      Notwithstanding anything herein contained if the Company charges
         pledges or otherwise encumbers (whether by way of fixed or floating
         security) any of the Charged Assets SIXTHLY described in clause 2.2 or
         attempts so to do without the prior consent in writing of the Bank or
         if any creditor or other person attempts to levy any distress
         execution sequestration or other process against any of the Charged
         Assets SIXTHLY described in such clause the charge hereby created over
         the assets the subject thereof shall automatically without notice
         operate as a fixed charge instantly such event occurs

3.       The Company's General Covenants

The Company COVENANTS with the Bank:-

3.1      ON DEMAND (save where otherwise specified in the Loan Agreement or
         agreed in writing between the parties hereto) to pay to the Bank all
         money and discharge all obligations and liabilities which now are or
         at any time hereafter may be due owing or incurred from or by the
         Company to the Bank or for which the Company may be or become liable
         to it in whatever currency denominated on any current or other account
         or in any manner whatever (whether alone or jointly with any other
         person or corporate body and in whatever style or form and whether as
         principal or surety) including (without prejudice to the generality of
         the above) all liabilities in connection with foreign exchange
         transactions and for accepting endorsing or discounting any notes or
         bills and/or under bonds guarantees indemnities documentary or other
         credits or any instruments whatsoever from time to time entered into
         by the Bank for or at the request of the Company or for any other
         matter or thing whatsoever including interest to the date of repayment
         (calculated at the Interest Rate and payable as well after as before
         judgement or the insolvency of the Company) commission fees and other
         charges and all legal and other costs charges and expenses on a full
         indemnity basis together with any Value Added Tax at the applicable
         rate which may be or become due in respect of all or any such matters





                                       3
<PAGE>   5
3.2      That the Company will not without the prior consent in writing of the
         Bank:-

3.2.1    sell assign discount factor pledge charge or otherwise dispose of the
         premises Fourthly described or any part thereof or deal with the same
         otherwise than in accordance with clause 6.2 or

3.2.2    create or attempt to create or permit to subsist any other mortgage
         debenture charge or pledge upon or permit any lien or other
         encumbrance (save a lien arising by operation of law in the ordinary
         course of trading) to arise on or affect the Charged Assets ranking in
         priority to or pari passu with this Debenture or

3.2.3    part with possession of assign transfer sell lease or otherwise
         dispose of the interest of the Company in the Charged Assets or any
         part thereof or attempt or agree so to do (except in the case of stock
         in trade charged by way of floating charge only which may be sold at
         market value in the usual course of trading as now conducted and for
         the purpose of carrying on the normal business of the Company)

3.2.4    create or permit to exist any mortgage charge debenture or pledge upon
         any of the Charged Assets which will rank after the charges contained
         in this Debenture (provided that the consent of the Bank shall not be
         unreasonably withheld)

3.3      Without prejudice to and in addition to every other remedy of the Bank
         to pay on a full indemnity basis to the Bank on demand or (as the case
         may be) to any Receiver on demand the amount of all expenses properly
         incurred by the Bank or any Receiver in relation to this Debenture
         with interest thereon at the Interest Rate from the respective time or
         times at which such money shall have been expended until the date of
         repayment and until repayment such sums and interest shall be charged
         upon the Charged Assets and for the avoidance of doubt IT IS HEREBY
         AGREED that the expression "expenses" includes all costs moneys
         charges and expenses properly paid and all liabilities properly
         incurred by the Bank or any Receiver (including legal costs charges
         and expenses ascertained as between solicitor and own client) on or in
         connection with or incidental to the Charged Assets and this Debenture
         and all expenses herein covenanted by the Company to be paid and in
         particular in connection with

3.3.1    Inspecting surveying or obtaining any report of any nature or of any
         kind whatsoever in connection with the Charged Assets or repairing or
         maintaining all or any of the Charged Assets or rebuilding or
         reinstating any part of the Property or any works thereon where the
         Bank or any Receiver reasonably considers such to be necessary for the
         benefit or preservation of the Bank's security

3.3.2    investigating any matter in relation to the Charged Assets and/or any
         specific aspect of the Company's affairs (or more than one) and/or
         considering enforcing or attempting to enforce the rights and powers
         of the Bank or any Receiver hereunder or under the general law

3.3.3    doing or considering any other matter or thing whatsoever which the
         Bank or any Receiver reasonably considers to be for the benefit of or
         preservation of or the more advantageous realisation of the Bank's
         security





                                       4
<PAGE>   6
4.       Covenants Regarding the Property

The Company COVENANTS with the Bank as follows in relation to the Property:-

4.1      To permit the Bank and its duly authorised agents and representatives
         at any time upon reasonable prior notice with or without others to
         enter upon the Property or any part or parts thereof and examine the
         condition thereof without thereby becoming liable as mortgagee or
         chargee in possession

4.2      To keep the Property in good and substantial repair and good working
         order and condition and as and when necessary to rebuild renew or
         replace the same and not to pull down or remove or sell or otherwise
         dispose of any part of the same without the prior consent in writing
         of the Bank except in the ordinary course of use repair maintenance or
         improvement and if the Company shall fail to do so the Bank and its
         duly authorised agents and representatives shall be entitled (but not
         bound) at any time to enter upon the Property or any part or parts
         thereof and execute such works of repair and maintenance as in the
         opinion of the Bank may be necessary or proper without thereby
         becoming liable as mortgagee or chargee in possession

4.3.1    At all times during the continuance of this security to keep the
         Property insured against loss or damage by fire civil commotion
         explosion aircraft and articles dropped from aircraft and against
         storm tempest lightning flooding burst pipes and malicious damage
         together with cover against all relevant liabilities to third parties
         and in respect of environmental impairment liabilities of any nature
         and such other risks and contingencies as the Bank may from time to
         time require to the extent of the full reinstatement value or the
         amount of the potential liability with full provision for estimated
         inflation in respect of such value or liability and in respect of the
         construction and other costs involved and including a sum to cover the
         cost of demolition debris removal and architects' engineers'
         surveyors' and other professional fees (including any Value Added Tax
         payable on or included in such costs and fees or otherwise) and if the
         Property is wholly or partly let for three years' loss of rent with
         insurers previously approved by the Bank in writing in the joint names
         of the Company and the Bank or at the option of the Bank in the name
         of the Company with the interest of the Bank in the Property being
         noted on the insurance policy and with the policy containing such
         provisions for the protection of the Bank as the Bank may reasonably
         require to avoid the interest of the Bank being prejudiced by any act
         of the Company or of any occupier

4.3.2    To deposit with the Bank the original of (or at the option of the Bank
         a certified copy or copies of) the insurance policy or policies
         relating to the Property and punctually to pay all premiums necessary
         for the purpose of such insurance (on demand producing to the Bank the
         receipt for every payment of premium thereunder) and likewise to
         notify the Bank in a timely manner (confirming such notification in
         writing) if any event occurs or circumstances arises which may give
         rise to a claim under any such policy or policies or which may affect
         the continuance or validity of any such policy or policies and
         thereafter comply with the reasonable requirements of the Bank in
         relation thereto

4.3.3    To hold all monies which may be received by the Company by virtue of
         any policy relating to the Property in trust for the Bank and to apply
         the same (at the option of the Bank but without prejudice to any
         obligation in the policy of insurance or any other





                                       5
<PAGE>   7
         obligation having priority to the obligations imposed by this
         Debenture) either in making good the loss or damage in respect of
         which the same may have been received with any deficiency being made
         good by the Company or in discharge or reduction of the monies hereby
         secured

4.3.4    PROVIDED THAT if the Company shall at any time refuse or neglect to
         keep the said insurances on foot or to comply in any material respect
         with the covenants hereinbefore contained the Bank shall have power to
         insure against the covers and risks mentioned in clause 4.3.1 and the
         Company will on demand pay to the Bank every sum expended by the Bank
         in so doing

4.3.5    AND PROVIDED THAT if the Company has a leasehold interest in the
         Property and at all times the interest of the Bank is noted on the
         relative policy of insurance and it gives cover against such risks as
         the Bank shall require and contains in favour of the Bank such
         provisions for the protection of the Bank as the Bank may reasonably
         require and insurance is to the full reinstatement value of the
         Property the Bank will accept in compliance with the terms of this
         clause the insurance maintained in accordance with the lease under
         which the Company holds the Property

4.3.6    AND PROVIDED FURTHER that every insurance of the Property effected by
         the Company whether or not pursuant to the covenant in that behalf
         hereinbefore contained shall be deemed to be an insurance for the
         maintenance of which the Company is liable under this Debenture

4.4      To pay when due all outgoings (whether of a capital or revenue nature
         and even if the wholly novel) payable to the landlord of the Property
         (if the same is leasehold land) and/or to the local or any other
         authority or to a statutory undertaker in respect of the Property or
         the supply of services to the Property and to reimburse to the Bank on
         demand any such sum paid by the Bank

4.5      To comply with and (where appropriate) enforce each and every covenant
         and provision contained in any document affecting the Property and
         comply with all bye-laws and planning local authority and statutory
         requirements affecting the Property its use and occupation and the
         employment of persons at the Property

4.6.1    If the Property or any part thereof is let to take such action
         (including legal proceedings) as may be reasonably necessary to
         procure the payment of rent by and to enforce the observance and
         performance of terms conditions and covenants on the part of every
         tenant of the Property or such part and to observe and perform the
         terms conditions and covenants on the part of the Company in respect
         of such letting

4.6.2    To pay into such account with the Bank in the name of the Company or
         to such other account as the Bank shall from time to time direct all
         monies which the Company may receive by way of rent licence fee or
         other like payment in respect of the Property or any part thereof and
         pending such payment to hold such moneys in trust for the Bank

4.6.3.   If so required by the Bank to instruct all or any tenants licensees
         and/or other occupiers of any part of the Property to pay all sums due
         by way of rent licence fee or other like payment in respect of the
         Property or any part thereof to such account with the Bank in the name
         of the Company or such other account as the Bank shall from time to
         time direct





                                       6
<PAGE>   8
4.6.4    Not (without the prior consent in writing of the Bank) to charge or
         otherwise dispose of or release exchange compound set-off or grant
         time or indulgence in respect of or otherwise deal with all or any
         part of any rent licence fee or other like payment in respect of the
         Property or any part thereof nor (without the like consent) to
         withdraw charge or otherwise dispose of any part of the moneys
         standing to the credit of any such account as is mentioned in clauses
         4.6.2 and 4.6.3

4.6.5    If the Property or any part is leasehold to take such action as
         aforesaid to enforce the observance and performance of terms
         conditions and covenants on the part of the landlord of the Property
         or such part and to pay the rents reserved by and generally observe
         and perform the terms conditions and covenants on the part of the
         Company contained in the lease under which the Company holds the
         Property or such part

4.7      Not without the written consent of the Bank to part with possession of
         the Property or any part or grant a tenancy or lease or accept a
         surrender of any tenancy or lease relating to the Property or any part
         thereof nor to release or vary any of the terms of nor grant any
         consent licence or permission under any such tenancy or lease nor
         agree any rent review nor exercise any power to determine or extend
         the same to the intent that the statutory and other powers otherwise
         available to the Company in respect of all or any of such matters
         shall not be exerciseable during the continuance of this security
         without the Bank's consent

4.8      Save as permitted under clause 4.7 hereof not to part with or share
         possession or occupation of the Property or part thereof nor to grant
         to any person any licence right or interest to occupy the Property or
         any part thereof nor create or permit to arise any overriding interest
         (as defined in the Land Registration Acts 1925 to 1988)

4.9      Not without the written consent of the Bank to:-

4.9.1    grant or suffer to be created or acquired any option proprietary right
         or interest or any easement right licence privilege or profit a
         prendre which shall affect or in any way relate to the Property or any
         part nor do or cause or permit to be done anything which may in any
         way depreciate jeopardise or otherwise prejudice the value of the
         Property to the Bank as security

4.9.2    exercise any option which in any way relates to the Property or any
         part of it (including any option regarding the application of Value
         Added Tax to any disposal of any interest in the Property or any part
         of it or to any rental in respect of the Property or any part of it)

4.10.1   Not to bring onto the Property any hazardous substance in a quantity
         notifiable under the Notification of Installations Handling Hazardous
         Substances Regulations 1982 and/or any regulations made under the
         Planning (Hazardous Substances) Act 1990 without the prior written
         consent of the Bank and (without prejudice to the Bank's power to
         refuse its consent) any such consent may be subject to conditions the
         nature and scope of which are to be at the Bank's entire and
         unfettered discretion

4.10.2   Not to use any part of the Property for a contaminative use and/or the
         deposit of waste material of any nature or any operation which might
         involve the deposit of waste material within the scope of any
         regulation issued by any competent authority without the prior written
         consent of the Bank as mentioned in clause 4.10.1





                                       7
<PAGE>   9
4.10.3   To comply at the expense of the Company in a timely and effective
         manner with the requirements of any competent authority in respect of
         any matter falling within the scope of the Companys obligations under
         clauses 4.10.1 or 4.10.2 including (without in any way limiting the
         scope of the Companys obligations under this clause) any requirement
         on the part of the National Rivers Authority any waste regulation
         authority and any health and safety executive.

4.10.4   If so required by the Bank at any time and from time to time to
         procure at the expense of the Company and for the benefit of the
         Company and the Bank any environmental audit assessment or
         investigation which the Bank may deem necessary in order to determine
         the extent of (or any deficiencies in) the Companys compliance with
         its obligations under this clause 4.10 or to satisfy the Bank or any
         other person (including any competent authority) as to the extent of
         any environmental liability or risk applicable at any time in respect
         of any part of the Property

4.11     Not without the written consent of the Bank to make any application
         under the Town and Country Planning Acts 1971 to 1990 to change the
         authorised use of or to carry out development upon the Property nor to
         apply for an established use certificate

4.12     To notify the Bank forthwith of any notice order proposal or
         information received by the Company in respect of proposals for the
         compulsory acquisition of or otherwise relating to or affecting the
         Property or any part thereof or any application by a person other than
         the Company for planning permission affecting the Property or any part
         thereof and at the request of the Bank to make or join with the Bank
         in making such objections or representations against or in respect of
         any such proposal as the Bank shall consider expedient and any
         compensation received by the Company as a result of any such notice
         order or proposal shall be held in trust for and paid to the Bank in
         reduction of the monies obligations and liabilities secured by this
         Debenture

4.13     To inform the Bank forthwith if the Company acquires or agrees to
         acquire any interest in freehold or leasehold property and to deposit
         with the Bank and to permit the Bank during the continuance of this
         security to hold and retain all deeds and documents of title relating
         to the Property or any part thereof and such other documents relating
         to the Property as the Bank may from time to time require

4.14     At any time it and when required by the Bank to provide such
         instructions and authorities addressed to or in favour of the Bank or
         otherwise and in such form as the Bank shall require (including any
         such as are required for or relate to the due performance of the
         Companys obligations under any other covenant in this Debenture) and
         to execute such further legal or other mortgages charges or
         assignments in favour of the Bank as the Bank shall from time to time
         require over all or any part of the Property and all rights and
         remedies relating thereto both present and future (including any
         vendor's lien) to secure all moneys obligations and liabilities hereby
         covenanted to be paid or otherwise hereby secured such further
         mortgages charges or assignments to be prepared by or on behalf of the
         Bank at the cost of the Company and to contain an immediate power of
         sale without notice a clause excluding section 93 and the restrictions
         contained in section 103 of the Law of Property Act 1925 and such
         other clauses for the benefit of the Bank as the Bank may reasonably
         require





                                       8
<PAGE>   10
5.       Covenants Regarding the Charged Assets Generally

The Company COVENANTS with the Bank as follows in relation to the Charged
Assets (including the Property where relevant):-

5.1      To observe and perform all covenants and stipulations from time to
         time affecting its patents patent applications trade marks trade names
         registered designs and copyrights and all other industrial or
         intangible property or any licence or ancillary or connected rights
         from time to time relating to industrial or intangible property and to
         preserve maintain and renew when necessary or desirable all such
         licences and rights

5.2      To keep all plant machinery vehicles computers and office and other
         equipment and every part thereof in good and substantial repair and in
         good working order and condition and not to remove or sell or
         otherwise dispose of any of the same without the prior consent in
         writing of the Bank except in the ordinary course of use repair
         maintenance or improvement and if the Company is at any time in
         default in complying with this covenant the Bank shall be entitled but
         not bound to repair and maintain the same with power for the Bank its
         agents and their respective employees to enter any of the Company's
         property for that purpose or to inspect the same and all expenses thus
         incurred by the Bank shall be properly incurred for the purposes of
         this Debenture

5.3.1    At its own expense to insure and keep insured all Charged Assets of an
         insurable nature with insurers previously approved by the Bank in
         writing against all prudent risks (having regard to the nature of the
         Charged Assets in question) and such other risks and contingencies as
         the Bank shall from time to time request to the full replacement value
         thereof from time to time in the joint names of the Company and the
         Bank or at the option of the Bank in the name of the Company with the
         interest of the Bank noted on the policy or policies and with the
         policy or policies containing such provisions for the protection of
         the Bank as the Bank may reasonably require

5.3.2    To maintain such other insurance policies (with the interest of the
         Bank noted thereon) containing like provisions for the protection of
         the Bank as are normally maintained by prudent companies carrying on
         similar businesses and duly pay within one week of the same becoming
         due all premiums and other moneys necessary for effecting and keeping
         up such insurances and on demand produce to the Bank the policies of
         such insurance and proof of such payments failing which the Bank may
         take out or renew such insurances in any sum which the Bank may think
         expedient and all money expended by the Bank under this provision
         shall be reimbursed by the Company on demand

5.3.3    All moneys to be received by virtue of any insurance maintained or
         effected by the Company (whether or not in pursuance of the
         obligations hereunder) shall be paid to the Bank (or if not paid by
         the insurers directly to the Bank held on trust for the Bank) and
         shall at the option of the Bank be applied in replacing restoring or
         reinstating the Charged Assets destroyed damaged or lost (any
         deficiency being made good by the Company) or in reduction of the
         moneys obligations and liabilities hereby secured

5.4      To pay punctually and indemnify the Bank and any Receiver against all
         existing and future rental charges licence fees royalties and all
         other duties charges assessments impositions and outgoings whatsoever
         (whether imposed by agreement statute or otherwise and whether in the
         nature of capital or revenue and even if wholly novel) now or at any





                                       9
<PAGE>   11
         time during the continuance of this security payable in respect of the
         Charged Assets or any part thereof or by the owner or user thereof
         (including all calls instalments and other payments that may be made
         or become due in respect of the Securities) and any such sums paid by
         the Bank or any Receiver shall be reimbursed by the Company on demand

5.5      Not (without the prior consent in writing of the Bank) to vary
         surrender cancel assign charge or otherwise dispose of or permit to be
         forfeit its interest in any credit sale hire purchase leasing rental
         licence or like agreement for any material equipment used in its
         business but generally to fulfill its obligations under every such
         agreement and when required produce to the Bank proof of all payments
         from time to time due from the Company thereunder

5.6      Not (without the prior consent in writing of the Bank) to form or
         acquire any subsidiary or transfer sell lease or otherwise dispose of
         any Charged Assets to any subsidiary save on terms previously approved
         in writing by the Bank

5.7      Not (without the prior consent in writing of the Bank) to permit any
         person to become entitled to any proprietary right or interest which
         might affect the value of any of the Charged Assets nor to do or cause
         or permit to be done anything which may in any way depreciate
         jeopardise or otherwise prejudice the value to the Bank of any
         security hereby created

5.8      To inform the Bank forthwith if the Company acquires or agrees to
         acquire any share or security falling within the Securities and to
         deposit with the Bank and permit the Bank during the continuance of
         this security to hold and retain the following:-

5.8.1    all insurance policies relating to the Charged Assets

5.8.2    all stock and share certificates and documents of title relating to
         the Securities and such deeds of transfer in blank and other documents
         as the Bank may from time to time require for perfecting its title to
         the Securities (duly executed by or signed on behalf of the registered
         holder) or for vesting or enabling it to vest the same in itself or
         its nominee or trustee or in any purchaser

5.8.3    all assurance policies from time to time effected by the Company on
         the lives of key employees and

5.8.4    all such other documents relating to the Charged Assets as the Bank
         may from time to time require

5.9      To procure that all votes which may be cast by or on behalf of the
         Company as a shareholder in any other corporate body to which any of
         the Securities relate and all votes which may be cast by or on behalf
         of any nominee of the Company as a director of any such corporate body
         shall be so cast as to procure the due and timely registration by any
         such corporate body of any transfer of that part of the Securities to
         the Bank or to any trustee for or nominee of the Bank or any purchaser
         (subject only to the due stamping of the relevant transfer or
         transfers) and so as to prevent any variation in the share capital of
         (including the issue of unissued shares) or the rights of shareholders
         in any such corporate body

5.10     At any time if and when required by the Bank to provide such
         instructions and authorities in favour of the Bank or otherwise and in
         such form as the Bank shall require and to execute such further fixed
         or floating charges or assignments in favour of the Bank as the Bank
         shall from time to time require over all or any of the Charged Assets
         both present





                                       10
<PAGE>   12
         and future including but not limited to the Securities and the book
         and other debts revenues and claims of the Company and all rights and
         remedies relating thereto both present and future (including any
         vendor's lien) to secure all moneys obligations and liabilities hereby
         covenanted to be paid or otherwise hereby secured such further charges
         or assignments to be prepared by or on behalf of the Bank at the cost
         of the Company and to contain an immediate power of sale without
         notice a clause excluding section 93 and the restrictions contained in
         section 103 of the Law of Property Act 1925 and such other clauses for
         the benefit of the Bank as the Bank may reasonably require

6.       Covenants Regarding the Company's Business

The Company FURTHER COVENANTS with the Bank as follows:-

6.1      To conduct and carry on its business in a proper and efficient manner
         and not to make any substantial alternation in the nature of or mode
         of conduct of that business and to keep or cause to be kept proper
         books of account relating to such business

6.2      To get in and realise all book and other debts and claims hereby
         charged in the ordinary course of its business and to pay into the
         Company's account with the Bank or to such other account as the Bank
         shall from time to time direct all moneys which it may receive in
         respect of the same forthwith on receipt and pending such payment to
         hold such moneys on trust for the Bank and not (without the prior
         consent in writing of the Bank) charge or otherwise dispose of or
         release exchange compound set off or grant time or indulgence or
         otherwise deal with all or any of the same or purport so to do

6.3      To furnish to the Bank copies of the profit and loss account balance
         sheet and directors' report in respect of each financial year of the
         Company its holding company or companies and such of the subsidiaries
         of the Company or its holding company or companies as the Bank may
         from time to time require all such reports balance sheets and accounts
         to be prepared in accordance with generally accepted accounting
         principles and showing a true and fair view of their respective
         affairs the relevant profit or loss and the source and application of
         funds certified by duly qualified auditors approved by the Bank and to
         be furnished forthwith upon the same becoming available and not in any
         event later than the expiration of four months from the end of such
         financial year and also at the time of issue copies of all statements
         and circulars to shareholders or to any class of creditors and from
         time to time such other information statements forecasts and
         projections of the Company its holding company or companies and the
         subsidiaries of the Company or it holding company or companies as the
         Bank may require

6.4      Not (without the prior consent in writing of the Bank) to call or
         receive in advance of calls all or any part of the uncalled capital of
         the Company nor to redeem or purchase its own shares nor pay an
         abnormal amount by way of dividend

6.5      If required by the Bank to procure that each subsidiary of the company
         shall guarantee to the Bank payment of all moneys obligations and
         liabilities hereby covenanted to be paid and charge all its
         undertaking property and assets to secure the same in such manner as
         the bank shall from time to time require





                                       11
<PAGE>   13
6.6      To keep the bank fully informed with regard to all aspects of the
         trading general affairs and prospects of the Company and from time to
         time and at any time if so required by the Bank:-

6.6.1    To provide such further information financial statements and copy
         documents as the Bank shall require and

6.6.2    To afford to the Bank and its officers and agents full and
         unrestricted access to the accounting and other records of the Company
         with all necessary facilities for taking copies thereof and/or
         extracts therefrom

7.       Power of Sale and Power to Appoint a Receiver

7.1      Section 103 of the Law of Property Act 1925 shall not apply hereto and
         the statutory power of sale and other powers (whether given by statute
         or expressed herein) shall be exerciseable without further notice at
         or at any time after demand for payment of any money or the
         performance of any obligation or discharge or any liability hereby
         secured whether or not the Company shall have been accorded sufficient
         time or any time in which to satisfy the demand made and the date of
         such demand shall (without prejudice to the equitable right of
         redemption) be the redemption date

7.2      No purchaser or other person shall be bound or concerned to see or
         enquire whether the right of the Bank or any Receiver appointed by it
         to exercise any of the powers hereby conferred has arisen or not or be
         concerned with notice to the contrary or with the propriety of the
         exercise or purported exercise of such powers

7.3      At or at any time after demand as aforesaid the Bank may appoint any
         person to be a Receiver of the Charged Assets or any part thereof
         (with power to authorise any joint Receiver to exercise any power
         independently of any other joint Receiver) and may remove any Receiver
         so appointed and appoint another in his place as to the whole or any
         part of the Charged Assets and such Receiver so appointed shall have
         all the powers conferred from time to time on receivers by statute (as
         varied and extended by this Debenture) and in addition (so far as
         requisite and/or applicable to the Charged Assets) the powers
         conferred on an administrator and an administrative receiver by
         sections 14(1) and 42(1) of the Insolvency Act 1986 and power on
         behalf of the Company (notwithstanding the insolvency of the Company)
         to do or omit to do anything which the Company could do or omit to do
         in relation to the Charged Assets or any part thereof

7.4      Without prejudice to any other remedy of the Bank and notwithstanding
         that the statutory power of sale and other powers may not then be
         exerciseable as provided in clause 7.1 the Bank shall be entitled upon
         the Companys default in the payment of interest or any other sum
         without demand or notice to the Company to appropriate all or any part
         of the moneys standing to the credit of any account mentioned in
         clause 4.6.2 and/or clause 4.6.3 in or towards the payment of any
         interest or other sum then due from the Company to the Bank





                                       12
<PAGE>   14
8.       Powers of the Bank and of a Receiver

At or at any time after demand as aforesaid the Bank and any Receiver appointed
hereunder may (without thereby becoming liable as mortgagee in possession
and/or to account for any sums other than actual receipts) exercise the
following powers without the need to observe any of the provisions of sections
99 and 100 of the Law of Property Act 1925:-

8.1      To sell exchange convert into money or otherwise dispose of or deal
         with the whole or any part of the Charged Assets alone or in parcels
         either by public auction or private contract for such consideration
         and generally on such terms and conditions as the Bank or the Receiver
         (as the case may be) deems fit and either for a lump sum or for a sum
         payable in instalments or for a sum on account and a mortgage or
         charge for the balance or for debentures or other obligations or
         shares stock securities or other valuable consideration and with power
         to buy rescind or vary any contract for sale and to resell the whole
         or any part of the Charged Assets without being responsible for any
         loss which may be occasioned to the Company thereby and so that
         covenants and contractual obligations may be granted and assumed in
         the name of and so as to bind the Company (or other the estate owner
         in the case of land) if the Bank or the Receiver (as the case may be)
         shall consider it necessary or expedient so to do

8.2      To make agreements for leases and to grant leases of the whole or any
         part of the Charged Assets and surrender and accept surrenders of
         leases and grant vary or terminate any options and/or licences upon
         such terms (including the length of the term of any lease or licence
         and payment of any premium) and at such rents commissions or fees as
         the Bank shall think fit and in the case of land without any further
         consent by or notice to the Company to exercise on behalf of the
         Company all the powers and provisions conferred on a landlord or a
         tenant by the Landlord and Tenant Acts 1927 to 1988 the Rent Acts 1974
         to 1985 the Housing Act 1988 the Agricultural Holdings Acts 1948 to
         1986 the Agriculture Act 1986 and any other legislation from time to
         time in force relating to the rights of landlords and tenants rents
         housing and agriculture in respect of any part of the Property but
         without any obligation to exercise any of such powers and without any
         liability in respect of powers so exercised or omitted to be exercised

8.3      As agents for the Company to remove store sell or otherwise deal with
         any furniture equipment or goods of the Company (including motor
         vehicles) and the Bank and the Receiver shall not be liable for any
         loss or damage occasioned to the Company and the Company shall
         indemnify the Bank or the Receiver (as the case may be) against all
         expenses incurred by them in relation to such furniture equipment or
         goods and such expenses shall be deemed to have been property incurred
         for the purposes of this Debenture

8.4      Upon any sale made or lease granted in exercise of the powers
         conferred in that behalf by this Debenture or by statute the Bank or
         the Receiver (as the case may be) may sever and sell any fixtures upon
         the Property and in the case of a sale or lease of part only of the
         Property may make such arrangements as the Bank or the Receiver (as
         the case may be) shall think fit for the apportionment of any rent
         effecting the part sold or for charging the rent wholly upon part only
         of the Property and for the indemnification of any purchaser or
         purchasers against the whole or any part of the rent or the
         performance or





                                       13
<PAGE>   15
         observance of any of the covenants or agreements affecting the
         Property either by the limitation of a new rent or by powers of entry
         and distress and entry and taking the income thereof or otherwise

8.5      To obtain all necessary planning permissions building regulation
         approvals and any other permissions consents or licences as may be
         necessary to develop the Property as the Bank or the Receiver (as the
         case may be) shall think fit

8.6      To deal generally with and manage and to carry on all such development
         upon the Property as the Bank or the Receiver (as the case may be) may
         deem proper to carry on and to complete with or without modification
         any building or other works thereon which may be unfinished (with
         power to use any machinery and incorporate in any building any unfixed
         materials) and in particular to take over vary cancel or complete any
         contract relating thereto without being responsible for loss or damage
         and the cost thereof (including payment upon architects' and other
         professional certificates) shall be reimbursed by the Company and
         shall be charged upon the Charged Assets

8.7      To acquire any property asset or right (including the securing of
         vacant possession of any property) which the Bank or the Receiver may
         deem necessary or desirable for the more advantageous realisation of
         all or any part of the Charged Assets and to combine with and/or to
         sell or otherwise dispose of or deal with any such property asset or
         right with or without the Charged Assets or any part of them in such
         manner as the Bank or the Receiver may deem fit and all costs thus
         incurred shall be deemed to have been properly incurred for the
         purposes of this Debenture and until reimbursed by the Company shall
         be charged upon the Charged Assets

8.8.1    To pursue settle adjust or compromise any claim of against or arising
         out of any of the Charged Assets on such terms as the Bank or the
         Receiver shall think fit and to bring prosecute enforce or defend any
         such claim

8.8.2    To enter into any lawful agreement which the Bank deems fit to vary
         the priority of all or any claims against the Company as between the
         Bank and any other secured creditor of the Company and to execute any
         such agreement in the name of the Company

8.9      To take all such steps as the Bank or the Receiver (as the case may
         be) shall from time to time and at any time deem appropriate in order
         to contain reduce neutralize or eliminate any apparent potential or
         consequential damage or injurious effect to the Property its
         surroundings and/or the environment as a result of the escape or
         spillage of any hazardous substance or the presence of any waste
         material of any nature and in so doing to undertake any measures
         necessary to comply with the requirements of any competent authority

8.10     To appropriate the whole or any part of the moneys standing to the
         credit of any account mentioned in clause 4.6.2 or 4.6.3 in or towards
         the satisfaction of the Companys indebtedness to the Bank and if the
         Bank does not do so then (unless the Bank gives express notice to the
         contrary to the Company) it shall nevertheless be treated as if it had
         done so at the time of demand as aforesaid





                                       14
<PAGE>   16
9.       Receiver's Powers

9.1      Any Receiver appointed hereunder shall have in addition to the powers
         referred to in clause 8 hereof and to powers conferred by statute the
         following powers:

9.1.1    to take possession of collect and get in the Charged Assets or any
         part thereof and all rents and other income thereof accrued before or
         after the date of his appointment and for that purpose to take defend
         or discontinue any proceedings or submit to arbitration in the name of
         the Company or otherwise as he shall think fit

9.1.2    to exercise in respect of the Securities all voting or other powers or
         rights available to a registered holder thereof in such manner as he
         may think fit

9.1.3    to carry on manage develop reconstruct amalgamate or diversify the
         business of the Company or any part thereof or concur in so doing and
         to make any arrangement or compromise or enter into or cancel any
         contract as he may think fit

9.1.4    to make allowance to and re-arrangements with any lessees tenants or
         other persons from whom any rents licence fees profits commissions or
         other payments may be receivable

9.1.5    to institute carry on and conduct services of lighting heating
         cleansing and maintenance and all other services which may be deemed
         proper for the efficient use or management of the Charged Assets or
         any part thereof

9.1.6    to effect maintain renew and vary all requisite insurances in respect
         of the Charged Assets including insurances against occupiers' and
         third party liability in respect of the Property

9.1.7    to effect repairs renewals and improvements to and generally to manage
         the Charged Assets and to do all such other acts and things as may be
         considered to be incidental or conducive to any matters or powers
         aforesaid and which a Receiver may or can do as agent for the Company

9.1.8    to borrow money on the security of the Charged Assets or any part of
         them from the Bank or from any other lender either in priority to this
         security or not (as the Bank may determine) for any of the purposes
         mentioned in this clause or in clause 8 hereof

9.1.9    to employ upon such terms as he shall deem fit for the protection of
         the Property and for all or any of the purposes aforesaid solicitors
         architects surveyors quantity surveyors estate agents contractors
         builders managers and workmen and others and purchase all proper
         materials and equipment as he shall deem necessary

9.1.10   to promote the formation of companies with a view to the same
         purchasing leasing licensing or otherwise acquiring interests in all
         or any of the Charged Assets or otherwise to arrange for such
         companies to trade or cease to trade and to purchase lease licence or
         otherwise acquire all or any of the Charged Assets on such terms and
         conditions whether or not including payment by instalments secured or
         unsecured as he may think fit

9.1.11   to make calls conditionally or unconditionally on the members of the
         Company in respect of uncalled capital

9.1.12   to sign any document execute any deed and do all such other acts and
         things as may be considered by him to be incidental or conducive to
         any of the matters or powers aforesaid or to the realisation of the
         Bank's security and use the name of the Company for all the above
         purposes

9.2      All money expended by the Receiver (including interest paid by him on
         the borrowings) shall on demand be repaid by the company with interest
         thereon at the Interest Rate from





                                       15
<PAGE>   17
         the respective times at which such money shall have been expended
         until the date of repayment and until repayment such sums and interest
         shall be charged on the Charged Assets

9.3      All money or other consideration of whatsoever nature received by the
         Bank or by any Receiver appointed by the Bank in the exercise of any
         powers conferred by this Debenture shall forthwith become charged with
         the payment of all monies obligations and liabilities secured hereby
         and shall be applied after the discharge of the remuneration and
         expenses of the Receiver and all liabilities (if any) having priority
         thereto in or towards satisfaction of such of the moneys obligations
         and liabilities hereby secured and in such order as the Bank in its
         absolute discretion may from time to time conclusively determine (save
         that the Bank may credit the same to a suspense account for so long
         and in such manner as the Bank may from time to time determine and the
         Receiver may retain the same for such period as he and the Bank
         consider expedient)

9.4      Any Receiver appointed hereunder shall so far as the law allows be
         deemed to be the agent of the Company for all purposes and the Company
         shall be solely responsible for his acts defaults and remuneration and
         the Bank shall not be under any liability for his remuneration or
         otherwise and where (on account of the liquidation of the Company or
         otherwise) the law does not allow such interpretation any Receiver
         appointed hereunder shall be deemed to act as principal and not as
         agent of the Bank

9.5      The remuneration of the Receiver shall be appropriate to the work and
         responsibilities involved and charged at such rates as may be agreed
         between him and the Bank at or at any time after his appointment

9.6      The Company hereby agrees on demand to indemnify both the Bank and any
         Receiver against all losses actions claims expenses demands and
         liabilities whether in contract tort or otherwise now or hereafter
         incurred by it or him or by any manager agent officer or employee for
         whose liability act or omission it or he may be answerable for
         anything done or omitted in the exercise or purported exercise of the
         powers herein contained or occasioned by any breach by the Company of
         any of its covenants or other obligations to the Bank

10.      Appointments Consents and Notices

10.1     The Bank may appoint remove and replace a Receiver hereunder by
         writing under the hand of an authorised officer of the Bank

10.2     Any consent to be given by the Bank hereunder may be given by writing
         under the hand of an authorised officer of the Bank

10.3     A demand for payment or any other demand or notice under this
         Debenture shall be effective notwithstanding the insolvency or other
         incapacity of the Company and shall be made or given in writing by any
         agent or solicitor or authorised officer of the Bank and served on any
         one of the Companys directors or the Company Secretary personally or
         delivered or sent by first class letter post cable telex or facsimile
         transmission to its registered office or the address or place of
         business of the Company last known to the Bank or delivered or sent as
         aforesaid to the address of the Company stated in the Schedule and a
         demand or notice so addressed and posted shall be deemed to be
         delivered





                                       16
<PAGE>   18
         forty eight hours after posting and shall be effective notwithstanding
         that it be returned undelivered and notwithstanding the insolvency of
         the Company and in proving such service it shall be sufficient to
         prove that the notice or demand was properly addressed and posted and
         any notice or demand sent by cable telex or facsimile transmission
         shall be deemed to have been served at the time of despatch and shall
         be effective notwithstanding any incomplete or distorted transmission
         and in proving such service it shall be sufficient that the notice or
         demand (if by cable) was property addressed and dispatched or (if by
         telex or facsimile transmission) was transmitted to the number last
         known to the Bank from which the correct answerback or other
         appropriate acknowledgement of receipt was obtained

10.4     Any such notice or demand or (in the absence of manifest error) any
         certificate as to the amount at any time secured hereby shall be
         conclusive and binding upon the Company if signed by an authorised
         officer of the Bank

11.      Continuing Security and Banking Powers

11.1     This Debenture shall be a continuing security to the Bank
         notwithstanding the insolvency of the company and shall not be
         prejudiced by repayment or partial repayment of sums from time to time
         owing by the Company to the Bank or by the settlement of any account
         and is in addition to and shall not merge with or otherwise prejudice
         or affect any contractual or other right or remedy or any collateral
         or other securities now or hereafter held or available for any of the
         moneys hereby secured (even if the same shall be taken without the
         consent or against the prohibition of the Company in respect of moneys
         for which the Company is or shall be liable as surety only) and this
         Debenture shall not be in any way prejudiced or affected thereby or by
         the invalidity thereof or by the Bank now or hereafter dealing with
         exchanging releasing varying or abstaining from perfecting or
         enforcing any of the same or any rights which it may now or hereafter
         have or giving time for payment or indulgence or compounding with any
         other person liable

11.2     The Bank may from time to time give time for payment of any bill or
         bills of exchange or any promissory note or notes or any other
         security or securities which may have been discounted for or received
         in account from the Company by the Bank or on which the Company shall
         or may be liable as drawer or endorser or otherwise liable thereon as
         the Bank shall in its discretion think fit without in any manner
         releasing the Company or affecting the security hereby created and
         nothing herein contained shall operate so as to merge or otherwise
         prejudice or affect any bill note guarantee mortgage or other security
         which the Bank may for the time being have for any money or
         liabilities due or incurred by the Company to the Bank or any right or
         remedy of the Bank thereunder

11.3     The Bank may upon receiving notice of any charge or other interest
         affecting the Property or any part thereof (whether or not the Bank
         has consented hereunder to such charge or the creation of such other
         interest) close the then current account and open a new account with
         the Company and if the Bank does not open a new account then (unless
         the Bank gives express notice to the contrary to the Company) it shall
         nevertheless be treated as if it had done so at the time when it
         received such notice and as from that time no money paid in or carried
         to the credit of the Company in such new account shall be appropriated





                                       17
<PAGE>   19
         towards or have the effect of discharging any part of the amount due
         to the Bank on the said closed account at the time when it received
         such notice as aforesaid

11.4     If the Company shall have more than one account with the Bank (whether
         in the name of the Bank for the account of the Company or of the
         Company jointly with others and whether current deposit loan or of any
         other nature whatsoever whether subject to notice or not and whether
         in sterling or in any other currency and wheresoever situate) the Bank
         may at any time and without any prior notice in that behalf forthwith
         transfer all or any part of any balance standing to the credit of any
         such account to any other such account which may be in debit or in
         respect of which there are outstanding obligations or liabilities (be
         they present future actual contingent primary collateral several or
         joint) where such combination or transfer requires the conversion of
         one currency into another such conversion shall be calculated at the
         then prevailing spot rate of exchange of the Bank (as conclusively
         determined by the Bank) for purchasing the currency for which the
         Company is liable with the existing currency so converted

11.5     The Bank may at any time seek from any person having dealings with the
         Company (including any other mortgagee or chargee) such information
         about the Company's affairs as the Bank may think fit and the
         execution of this Debenture by the Company shall constitute an
         authority and request on the part of the Company to any such person to
         supply the requested information to the Bank without the need for any
         further authority other than a copy of this Debenture certified by an
         authorised officer of the Bank or by the Bank's solicitors

11.6     The execution of this Debenture by the Company shall constitute an
         authority on the part of the Company to the Bank to disclose to any
         bank or financial institution to whom the Bank is proposing to assign
         all or any of its rights hereunder or to offer or grant a
         participation in any loan secured by this Debenture such information
         concerning the affairs of the Company insofar as they relate to the
         Charged Assets in such manner and to such extent as the Bank shall
         from time to time deem fit

12.      Currency Clauses

12.1     All moneys received or held by the Bank or by a Receiver under this
         Debenture may from time to time be converted into such other currency
         as the Bank considers necessary or desirable to cover the obligations
         and liabilities of the Company in that currency at the then prevailing
         spot rate of exchange of the Bank (as conclusively determined by the
         Bank) for purchasing the currency to be acquired with the existing
         currency

12.2     If and to the extent that the Company fails to pay on demand any
         amount due the Bank may in its absolute discretion and without notice
         to the Company purchase at any time thereafter so much of a currency
         as the Bank considers necessary or desirable to cover the obligations
         and liabilities of the Company in such currency hereby secured at the
         then prevailing spot rate of exchange of the Bank (as conclusively
         determined by the Bank) for purchasing such currency with sterling and
         the Company hereby agrees to indemnify the Bank against the full
         sterling price (including all costs charges and expenses) paid by the
         Bank





                                       18
<PAGE>   20
12.3     No payment to the Bank (whether under any judgment or court order or
         otherwise) shall discharge the obligation or liability of the Company
         in respect of which it was made unless and until the Bank shall have
         received payment in full in the currency in which such obligation or
         liability was incurred and to the extent that the amount of any such
         payment shall on actual conversion into such currency fall short of
         such obligation or liability expressed in that currency the Bank shall
         have a further separate cause of action against the Company and shall
         be entitled to enforce the security hereby created to recover the
         amount of the shortfall

13.      Power of Attorney

13.1     As security for the covenants hereinbefore contained and in
         consideration of the Bank making available or continuing to make
         available banking facilities to the Company the Company hereby
         irrevocably during the continuance in force of this security appoints
         the Bank and the persons and corporate bodies deriving title under the
         Bank any person nominated in writing under the hand of an officer of
         the Bank or any successor in title and any Receiver appointed
         hereunder severally to be the attorney of the Company for the Company
         and in the Company's name and on the Company's behalf to execute seal
         and deliver or otherwise perfect any deed or other instrument or act
         which may be required or deemed proper for any of the purposes of this
         security (including any instruction or authority or any legal or other
         mortgage or any fixed or floating charge or assignment referred to in
         clauses 4.13 and 5.10) or to protect by registration or otherwise the
         interest of the Bank hereunder and this appointment shall operate as a
         general power of attorney under section 10 of the Powers of Attorney
         Act 1971

13.2     The Company hereby covenants with the Bank and its successors in title
         and separately with any such Receiver that on request the Company will
         ratify and confirm all security agreements documents acts and things
         and all transactions entered into by the Bank or such Receiver or by
         the Company at the instance of the Bank or such Receiver in the
         exercise or purported exercise of its or his powers and the Company
         irrevocably acknowledges and agrees that such power of attorney is
         inter alia given to secure the performance of the obligations owed to
         the Bank and any such Receiver by the Company

14.      Consolidation and Miscellaneous

14.1     The restriction of the right of consolidating mortgage securities
         contained in section 93 of the Law of Property Act 1925 shall not
         apply to this Debenture or to any security given to the Bank pursuant
         hereto

14.2     No failure or delay by the Bank in exercising any right or remedy
         shall operate as a waiver thereof nor shall any single or any partial
         exercise or waiver of any right or remedy preclude its further
         exercise or the exercise of any other right or remedy

14.3     The security given to the Bank pursuant to this Debenture shall extend
         to all indebtedness of the Company to the Bank as mentioned in clause
         3.1 whether or not the Bank was an original party to the relevant
         transaction by virtue of which such indebtedness or any part of it may
         from time to time arise





                                       19
<PAGE>   21
14.4     Each of the provisions of this Debenture is severable and distinct
         from the others and if at any time one or more of such provisions is
         or becomes invalid illegal or unenforceable the validity legality and
         enforceability of the remaining provisions hereof shall not in any way
         be affected or impaired thereby

14.5     To the extent that this Debenture constitutes a contract for the
         disposition of an interest in land within the terms of section 2 of
         the Law of Property (Miscellaneous Provisions) Act 1989 the parties
         hereto declare that all the terms which have been expressly agreed
         between them are contained or referred to in this Debenture

15.      Warranty and Undertaking

15.1     The Company hereby represents and warrants that the Company has full
         power authority and legal right to give and to observe the terms and
         conditions of this Debenture and that there is no provision in the
         memorandum or articles of association or any other constitutional
         document of the Company or in any other corporate document mortgage
         indenture trust deed or any other agreement binding upon the Company
         or affecting the Company which would inhibit or prevent the Company
         from entering into the obligations set out in this Debenture or
         prevent conflict with or affect the Company's performance or
         observance of any of the terms of this Debenture

15.2     The Company hereby undertakes to the Bank that the Company will obtain
         and maintain in full force and effect all governmental and other
         approvals and consents and do or cause to be done all other acts and
         things necessary or desirable in connection herewith or for the
         performance of the Company's obligations hereunder

16.      Proper Law and Jurisdiction

16.1     This Debenture shall be governed by and construed in accordance with
         the Law of England and Wales and the Company hereby irrevocably
         submits to the non-exclusive jurisdiction of the Courts in England and
         Wales

16.2     Without prejudice to the generality of the provisions of sections 695
         and 725 of the Companies Act 1985 and the Rules of the Supreme Court
         for the time being the Company hereby irrevocably authorises and
         appoints the solicitors named in the Schedule (or such other person
         being a firm of solicitors resident in England or Wales as the Company
         may by notice to the Bank substitute) to accept service of all legal
         process arising out of or connected with this Debenture and service on
         those solicitors (or such substitute) shall be deemed to be service on
         the Company

17.      Headings and Interpretation

17.1     The subject headings are for information only and do not affect the
         construction or effect of this Debenture

17.2     Words importing the masculine gender only include the feminine gender
         and words importing the singular number may include the plural number
         and vice versa





                                       20
<PAGE>   22
17.3     Words denoting or referring to a natural person shall include a body
         corporate and vice versa

17.4     Any reference to a statute includes any amendment or re-enactment of
         it for the time being in force and (where the context so admits or
         requires) any antecedent statute amended or re-enacted by that statute
         and any statutory instrument regulation or order deriving authority or
         validity therefrom

18.      Application for Restriction

The Company hereby applies to the Chief Land Registrar for the registration of
a restriction upon all registered titles comprised in this Debenture that no
dealing shall be registered without the written consent of the proprietor of
this Debenture

IN WITNESS whereof the parties have executed this Debenture as a deed on the
date shown in the Schedule

The Common Seal of        )
Horizon Exploration Ltd   )
was hereunto affixed in   )
the presence of:-         )


                 Director         /s/    [illegible signature]

                 Director         /s/    [illegible signature]





                                       21

<PAGE>   1

                                                                   EXHIBIT 10.43


                        Dated     [Do Not Date]     1995



                        HORIZON EXPLORATION LIMITED (1)

                                      AND

                          THE BANK OF N.T. BUTTERFIELD
                               & SONS LIMITED (2)





                                CHATTEL MORTGAGE





                               ALSOP WILKINSON

                                6 Dungate Hill
                               London EC4R 255
<PAGE>   2
                                     INDEX

                         (for reference purposes only)

<TABLE>
<CAPTION>
Clause           Heading                                                                                      Page Number
- ------           -------                                                                                      -----------
<S>              <C>
1                COVENANT TO PAY

2                MORTGAGE

3                COVENANTS OF THE MORTGAGOR

4                DEFAULT AND BANK'S POWERS OF SALE

5                RECEIVER

6                PROTECTION OF THIRD PARTIES

7                CONTINUING SECURITY

8                SUSPENSE ACCOUNT

9                NEW ACCOUNTS

10               SET-OFF

11               COSTS AND INDEMNITY

12               TIME AND INDULGENCES

13               AVOIDANCE OF PAYMENTS

14               MISCELLANEOUS

15               NOTICES
</TABLE>
<PAGE>   3
THIS DEED made
                                                                           1995

BETWEEN

(1)      HORIZON EXPLORATION LIMITED a company registered in England under
         company number 2804983 whose registered office is at 6 Pembroke Road
         Sevenoaks Kent TN1J 1XR ("the Mortgagor") and

(2)      THE BANK OF N.T. BUTTERFIELD & SON LIMITED acting through its London
         Branch of 24 Chiswell Street London EC1Y 4TY ("the Bank")

NOW THIS DEED WITNESSETH as follows:

WHEREAS:

(A)      The Bank has made general banking and contract finance facilities
         available to the Mortgagor;

(B)      The Mortgagor has now requested the Bank to make available to the
         Mortgagor a Term Loan Facility up to maximum amount of US $2,000,000
         ("the Term Loan Facility");

(C)      As a condition precedent to the Bank making available the Term Loan
         Facility the Bank requires the Mortgagor to enter into this Deed as
         security for all its obligations from time to time to the Bank;

1        COVENANT TO PAY
         ---------------

         The Mortgagor covenants on demand to pay and discharge to the Bank all
         monies obligations and liabilities whether principal interest or
         otherwise which may now or at any time in the future be due owing or
         incurred by the Mortgagor to the Bank whether actual or contingent and
         whether alone severally or jointly as principal guarantor surety or
         otherwise and in whatever name or style and whether on any current or
         other account or in any other manner together with interest charges
         and other expenses so that interest shall be calculated and compounded
         as may be agreed from time to time between the parties or, if not
         agreed, at the usual rate of interest of the Bank on such accounts as
         well after as before any demand made or judgment obtained hereunder
         (together hereinafter referred to as (the Secured Obligations).

2        MORTGAGE
         --------

         2.1     As security for the payment or discharge of the Secured
                 Obligations the Mortgagor as beneficial Owner HEREBY ASSIGNS
                 to the Bank by way of first ranking fixed legal mortgage ALL
                 the Chattels listed in the Schedule hereto ("the Chattels")
                 together with the benefit of all and any warranties guarantees
                 or indemnities or other rights relating to the Chattels and
                 the benefit of all maintenance agreements between the
                 Mortgagor and any third party insofar as the same are
                 assignable TO HOLD the same unto the Bank absolutely subject
                 only to the proviso for redemption hereinafter contained
                 PROVIDED that on payment and discharge of the Secured
                 Obligations the Bank shall at the request and cost of the
                 Mortgagor discharge this security.

         2.2     The Mortgagor shall at any time execute such deeds and do all
                 such things as the Bank may from time to time require to vest
                 in the Bank (subject to the proviso for redemption
                 hereinbefore contained) full right and title in and to the
                 Chattels.

3        COVENANTS OF THE MORTGAGOR
         --------------------------

         3.1     The Mortgagor covenants with the Bank during the terms of this
                 Deed as follows:
<PAGE>   4
                 3.1.1    not without the prior written consent of the Bank to
                          sell transfer or dispose of or part with possession
                          or control of or attempt to sell lease transfer or
                          dispose of the Chattels (or any interest therein) nor
                          directly or indirectly create or permit to exist any
                          mortgage lien pledge charge security interest
                          assignment or other encumbrance of any kind
                          whatsoever in relation to the Chattels;

                 3.1.2    to use the Chattels in a careful and proper manner
                          and to keep tines in good working order including by
                          way of repair of and adjustment to the Chattels;

                 3.1.3    not without the prior written consent of the Bank to
                          make changes or alterations to the Chattels;

                 3.1.4    not to lease hire out or otherwise part with
                          possession of the Chattels or permit or procure the
                          Chattels to be used other than in the business of the
                          Mortgagor without the prior written consent of the
                          Bank and then only subject to such further tends as
                          the Bank may require;

                 3.1.5    to pay punctually all taxes and duties however
                          designated insurance premiums maintenance or
                          servicing charges and other outgoings in respect of
                          the Chattels or their use;

                 3.1.6    to insure and keep insured the Chattels in the joint
                          names of the Bank and the Mortgagor or (at the
                          discretion of the Bank) with the interest of the Bank
                          noted against such policy to the full replacement
                          value thereof and against accident third party and
                          other risks normally covered by insurance and upon
                          such terms and with such insurers as shall be
                          approved in writing by the Bank and to produce to the
                          Bank on demand evidence of the policy of such
                          insurance and the receipt for the current premium in
                          respect thereof. If the Mortgagor shall fall to
                          insure the Chattels in accordance with this clause
                          the Bank may do all such things as it may consider
                          necessary to insure the Chattels and shall be
                          entitled to reimbursement from the Mortgagor upon
                          demand of all costs involved in securing such
                          Insurance;

                 3.1.7    to procure at its own expense that the Chattels can
                          at all times be used Without contravening any
                          legislation governing or affecting the same and the
                          use thereof

                 3.1.8    not to annex the Chattels to any property and/or land
                          to the intent that the equipment is not and shall not
                          become a fixture or fitting of such property and/or
                          land

         3.2     If the Mortgagor shall fail to satisfy the Bank that it has
                 performed any of its obligations under clause 3.1 then the
                 Bank may take such steps as it considers appropriate to
                 procure the performance of such obligation and shall not
                 thereby be deemed to be a mortgagee in possession and the
                 monies expended by the Bank shall be reimbursed by the
                 Mortgagor on demand and until so reimbursed shall carry
                 interest as mentioned in clause 1 from the cost of payment to
                 the date of reimbursement.

         3.3     The Mortgagor will indemnify and keep the Bank indemnified
                 from and against all and any costs claims damages and any
                 other expenses whatsoever that the Bank may suffer sustain or
                 incur or be called upon to pay by reason of or consequent upon
                 (whether directly or indirectly) it having entered into this
                 Deed or as a result of the Mortgagor failing to perform any
                 express or implied obligations on its part herein contained or
                 otherwise and without prejudice to the generality of the
                 foregoing from and against all rates taxes duties charges
                 imposition assessments and outgoings whatsoever payable
                 charged or imposed upon or in respect of the Chattels.
<PAGE>   5
4        DEFAULT AND BANK'S POWERS OF SALE

         4.1     This Deed shall become enforceable:

                 4.1.1    if any of the Secured Obligations shall not be paid
                          or discharged by the Mortgagor in accordance with
                          clause 1; or

                 4.1.2    if the Mortgagor shall be in breach of any provision
                          of this Deed or of any agreement containing any terms
                          and conditions of or applicable to the monies
                          obligations and liabilities secured by this Deed; or

                 4.1.3    upon the presentation of a petition for the
                          winding-up of the Mortgagor or the making of an order
                          for the winding up of the Mortgagor or the passing by
                          the Mortgagor of a resolution for voluntary
                          winding-up; or

                 4.1.4    if an encumbrancer shall take possession of or a
                          receiver shall be appointed over or any secures
                          creditor of the Mortgagor shall seek to enforce his
                          security in respect of all or any of the property or
                          assets charged by this Deed; or

                 4.1.5    if a petition shall be presented for an
                          administration order in relation to the Mortgagor; or

                 4.1.6    if the Mortgagor shall enter into any composition or
                          arrangement for the benefit of its creditors; or

                 4.1.7    any other event shall take place which in the opinion
                          of the Bank puts in jeopardy all or any part of the
                          security created by this Deed.

         4.2     The Secured Obligations shall be deemed to have become due
                 within the meaning of Section 101 of the Law of Property Act
                 1925 ("the Act") and the security created by the Mortgagor by
                 or pursuant to this Deed shall immediately become enforceable
                 and the power of sale and other powers conferred by the said
                 Section and/or by Schedule 1 to the Insolvency Act 1986, in
                 each case as varied or extended by this Deed, and all other
                 powers conferred on the Bank by this Deed shall be immediately
                 exercisable at any time, in relation to the whole or any part
                 of the Chattels, after the Bank shall have validly and
                 effectively demented the payment or discharge by the Mortgagor
                 of all or any of the Secured Obligations, any demand for
                 payment shall be valid ant effective for the purposes of this
                 sub-clause 4.2 notwithstanding that the demand may contain an
                 inaccurate or incomplete statement of the Secured Obligations.

5        RECEIVER
         --------

         5.1     The provisions of Clause 4 above notwithstanding, at any time
                 after the security constituted by this Deed shall have become
                 enforceable the Bank may by writing appoint any person or
                 persons to be a receiver or receivers of the Chattels or any
                 of them and remove any receiver or receivers so appointed and
                 appoint another or others in his or their place and a receiver
                 or receivers so appointed shall have powers:

                 5.1.1    to take possession of the Chattels or any part
                          thereof and for that purpose to take any proceedings
                          in the name of the Mortgagor or otherwise as may seem
                          expedient;

                 5.1.2    to carry on manage or concur in carrying on or
                          managing the business of the Mortgagor in relation to
                          the Chattels and for any of those purposes to raise
                          or borrow any monies;
<PAGE>   6
                          that may be required upon the security of the 
                          Chattel;

                 5.1.3    forthwith and without the restrictions imposed by
                          Section 103 of the Act to sell or concur in selling
                          (but where necessary with the leave of the Court) and
                          to lease the Chattels;

                 5.1.4    to make any arrangements in relation to the Chatter
                          which he or they shall think expedient;

                 5.1.5    to make and effect all repairs renewals and any
                          Improvements to the Chattels and to maintain or renew
                          all insurances;

                 5.1.6    to appoint managers, agents, officers, servants and
                          workmen for any of the aforesaid purposes at such
                          salaries and for such periods as he or they may
                          determine;

                 5.1.7    to do all such other acts and things as may be
                          considered to be incidental or conducive to any of
                          the matters or powers aforesaid and which he or they
                          lawfully ray or can do as agent for the Mortgagor

                 All moneys received by such receiver or receivers shall be
                 applied first in payment of his or their remuneration as may
                 be agreed between him or them and the appointor and the costs
                 of realization secondly in providing for the matters specified
                 in the first three paragraphs of Section 103(8) of the Act and
                 for the purposes aforesaid and thirdly in or towards
                 satisfaction of the Secured Obligations and all the foregoing
                 provisions in this Dead shall take effect as and by way of
                 variation and extension of the provisions of Section 99 to 109
                 inclusive of the Act which provisions so varied and extended
                 shall be regarded as incorporated herein. Any receiver or
                 receivers so appointed shall be deemed to be the agent or
                 agents of the Mortgagor and the Mortgagor shall be solely
                 responsible for his or their acts or defaults and for his or
                 their remuneration

         5.2     The Mortgagor irrevocably appoints the Bank any receiver and
                 any person nominated by the Bank jointly and also severally to
                 be the attorney of the Mortgagor with the power of
                 substitution and in its name and otherwise on its behalf and
                 as its act and deed to sign or execute all deeds, instruments
                 and documents which the Bank or any receiver may require or
                 teem proper for any of the purposes of or which the Mortgagor
                 ought to do under this Deed.

                 The Mortgagor agrees to ratify and confirm anything such
                 attorney shall lawfully and properly do.

6        PROTECTION OF THIRD PARTIES
         ---------------------------

         No person dealing with the Bank or with any receiver of the Chattels
         or any part thereof appointed by the Bank or with any delegate or
         sub-delegate of the Bank shall be concerned to enquire whether any
         event has happened upon which any of the posers, authorities and
         discretions conferred by or pursuant to this Deed in relation to the
         Chattels or any part thereof are or may be exercisable by the Bank or
         by any such receiver, delegate or sub-delegate or otherwise as to the
         propriety or regularity of acts purporting or intended to be in
         exercise of any such powers and 611 the protection to purchasers
         contained in Sections 104 and 107 of the Act and Section 42(3) of the
         Insolvency Act 1986 shall apply to any person purchasing from or
         dealing tenth the Bank or any such receiver, delegate or sub-delegate
         in like manner as if the statutory powers of sale end of appointing
         receiver in relation to the Chattels had not been varied or extended
         by this Deed.

7        CONTINUING SECURITY
         -------------------

         The security created by this Deed is a continuing security for the
         payment discharge and performance in
<PAGE>   7
         full of all the Secured Obligations and the security so created shall
         not be satisfied or otherwise prejudiced or effected by any
         intermediate payment or satisfaction of any part of the said amounts
         and the security so created shall be in addition to and shall not in
         any way be prejudiced or effected by any collateral guarantees or
         other security now or hereafter held by the Bank for any part of the
         said amounts Section 93 of the Act shall not apply to this Deed. Upon
         repayment in full of the Secured Obligations this security shall cease
         and determine

8        SUSPENSE ACCOUNT

         All monies received, recovered or realized by the Bank under this Deed
         may in the discretion of the Bank be credited to any suspense or
         impersonal account and may be held In such account for so long as the
         Bank thinks fit (with interest accruing thereon at such rate, if any,
         as the Bank may deem fit for the account of the Mortgagor) pending
         their application from ff me to time (as the Bank shall be entitled to
         do in its discretion) in or towards the discharge of any of the
         Secured Obligations.

9        NEW ACCOUNTS

         9.1     If the Bank shall at any time receive actual or constructive
                 notice of any charge or other interest affecting any part of
                 the property hereby charged then the Bank may open a new
                 account or accounts for the Mortgagor and if the Bank does not
                 do so then the Bank shall be treated as if it had in fact done
                 so at the time when it received or was deemed to receive
                 notice and as from that time all payments made by the
                 Mortgagor to the Bank shall be credited or treated as having
                 been credited to the new account and shall not operate to
                 reduce the amount secured by this Dead at the time when the
                 Bank received or was deemed to have received such notice.

10       SET-OFF

         10.1    The Bank may at any time and without notice to the Mortgagor
                 combine or consolidate all or any of the Mortgagor's then
                 existing accounts with and liabilities to the Bank and set off
                 or transfer any sum or sums standing to the credit of any one
                 or more of such accounts in or towards satisfaction of any of
                 the liabilities of the Mortgagor to the Bank on any other
                 account or in any other respects. The Bank shall notify the
                 Mortgagor that such a transfer has been made.

11       COSTS AND INDEMNITY

         11.1    All costs charges and expenses incurred by the Bank in
                 relation to this Deed or the monies and liabilities hereby
                 secured shall be reimbursed by the Mortgagor to the Bank on
                 demand on a full indemnity basis and until so reimbursed shell
                 carry interest as mentioned in clause 1 from the date of
                 payment to the date of reimbursement and be secured on the
                 property charged by this Deed.

         11.2    The Bank and every receiver attorney or other person appointed
                 by the Bank under this Deed and their respective employees
                 shall be entitled to be indemnified on a full indemnity basis
                 out of the property charged by this Deed in respect of all
                 liabilities and expenses incurred by any of them in or
                 directly or indirectly as a result of the exercise or
                 purported exercise of any of the powers authorities or
                 discretions vested in them under this Deed and against all
                 actions, proceedings, losses, costs, claims and demands in
                 respect of any matter or thing done or omitted in any way
                 relating to the property charged by this Deed and the Bank and
                 any such receiver may retain and pay all sums in respect of
                 the same out of the monies received under the powers conferred
                 by this Deed.
<PAGE>   8
12       TIME AND INDULGENCE

         12.1    The Bank may at any time or times without discharging or in
                 any way affecting the security created by or pursuant to this
                 Deed or any remedy in respect of such security, grant to the
                 Mortgagor time or indulgence or abstain from asserting,
                 calling, exercising or enforcing any remedies, securities,
                 guarantees or other rights which it may now or hereafter have
                 from or against the Mortgagor.

         12.2    The Bank may in its discretion grant time or other indulgence,
                 or make any other arrangement, variation or release with, any
                 person or persons not party hereto (whether or not such person
                 or persons are jointly liable with the Mortgagor) in respect
                 of any of the Secured Obligations or of any other security
                 therefor or guarantee in respect thereof without prejudice
                 either to the security constituted by or pursuant to this Deed
                 or to the liability of the Mortgagor for the Secured
                 Obligations or the exercise by the Bank of any rights,
                 remedies and privileges conferred upon it by this Deed.

13       AVOIDANCE OF PAYMENTS

         No assurance, security or payment which may be avoided under any law
         relating to bankruptcy, insolvency or winding-up (including Sections
         238, 239, 244 or 245 of the Insolvency Act 1986), and no settlement or
         discharge given or made by the Bank on the faith of any such
         assurance, security or payment, shall prejudice or affect the right of
         the Bank to enforce the security created by or pursuant to this Deed
         to the full extent of the Secured Obligations. Except in respect of
         the refinancing of the Secured Obligations by a third party financier
         as a result of which the Secured Obligations are repaid in full (but
         not in part only) to the Bank, the Bank may in its absolute discretion
         retain the security so created for the period of two Business Days
         plus such statutory period within which any security or payment given
         or made pursuant to this Deed can be avoided or invalidated after all
         facilities from time to time made available to the Mortgagor by the
         Bank shall have ceased to be available and the Secured Obligations
         shall have been paid in full, notwithstanding any release, settlement,
         discharge or arrangement given or made by the Bank on, or as a
         consequence of, such termination of liability. If at any time within
         such period after such termination a petition shall be presented to a
         competent court for an order for the bankruptcy, insolvency or
         winding-up of the Mortgagor shall commence to be wound up voluntarily,
         or an application for an administration order shall be made to a
         competent court in respect of the Mortgagor, the Bank may,
         notwithstanding as aforementioned, continue to retain such security or
         any part thereof far and during such further period as the Bank in its
         absolute discretion shall determine. The Mortgagor agrees that such
         security shall be deemed to have been and to have remained held by the
         Bank as and by way of security.

14       MISCELLANEOUS

         14.1    The Bank shall have a full and unfettered right to assign the
                 whole or any part of the benefit t of this Deed and the
                 expression 'the Bank' shall include its successors and assigns
                 and the Bank shall be entitled to disclose any informant on to
                 any actual or prospective assignee successor or participant.

         14.2    The provisions of this Deed shall be severable and if at any
                 time any one or more such provisions is or becomes invalid
                 illegal or unenforceable the validity, legality and
                 enforceability of the remaining provisions shall not in any
                 way be impaired.

         14.3    The rights and remedies of the Bank provided by this Deed are
                 cumulative ant are not exclusive of any rights powers or
                 remedies provided by law and may be exercised from time to
                 time and as often as the Bank may deem expedient.
<PAGE>   9
         14.4    Any reference in this Deed to any statute or any section of
                 any statute shall be deemed to include reference to any
                 statutory modification or re-enactment thereof for the time
                 being in force.

15       NOTICES

         15.1    Any demand or notice under this Deed shall be in writing
                 signed by any officer of the Bank and may be served personally
                 on any director or the secretary of the Mortgagor or may be
                 sent by post telex or facsimile or may be delivered to the
                 registered office of the Mortgagor or its last known place of
                 business. If such demand or notice is sent by post it shall be
                 deemed to have been received on the day following the day on
                 which it was posted and shall be effective notwithstanding
                 that it was not in fact delivered or was returned undelivered.
                 If sent by telex or facsimile it shall be deemed to have been
                 received (whether or not actually received) at the tine of
                 dispatch.

16       LAW AND JURISDICTION

         This Deed shall be governed by and construed in accordance with
         English law and the parties hereto irrevocably submit to the
         non-exclusive jurisdiction of the English Courts.

<PAGE>   1

                                                                   EXHIBIT 10.44

                                    FORM OF
                              EMPLOYMENT AGREEMENT


         THIS EMPLOYMENT AGREEMENT (this "Agreement"), is entered into as of
___________, 1997 (the "Effective Date"), by and between EAGLE GEOPHYSICAL
OFFSHORE, INC., a Texas corporation (the "Company"), and DAVID BURNS (the
"Executive").

         The Company desires to employ the Executive and the Executive desires
to accept employment with the Company, on the terms and conditions of this
Agreement.

         Accordingly, the parties agree as follows:

         1.      Employment Duties and Acceptance.

                 1.1      Employment by the Company; Duties.  The Company
hereby agrees to employ the Executive for a term commencing on the Effective
Date, and expiring at the end of the day twenty-four (24) months from the
Effective Date (such date, or later date to which this Agreement is extended in
accordance with the terms hereof, the "Termination Date"), unless earlier
terminated as provided in Section 4 or unless extended as provided herein (the
"Term").  The Term shall be automatically extended commencing on the second
anniversary of the Effective Date and on each anniversary of the Effective Date
thereafter (such date and each anniversary of such date being a "Renewal
Date"), so as to terminate twelve (12) months from such Renewal Date, unless
and until at least six (6) months prior to a Renewal Date either party hereto
gives written notice to the other that the Term should not be extended beyond
the next Renewal Date, in which event the Termination Date shall be the Renewal
Date following such notice.  During the Term, the Executive shall serve in the
capacity of Vice President - U.S. Offshore Operations of the Company and shall
also serve in those offices and directorships of subsidiary and parent
corporations or entities of the Company to which he may from time to time be
appointed or elected.  During the Term, the Executive shall devote all
reasonable efforts and all of his business time and services to the Company,
subject to the direction of the Board of Directors of the Company (the
"Board").  The Executive shall not engage in any other business activities
except for passive investments in corporations or partnerships not engaged in
the Company Business (as hereinafter defined) pursuant to Section 3 hereof.

                 1.2      Acceptance of Employment by the Executive.  The
Executive hereby accepts such employment and shall render the services and
perform the duties described above.

         2.      Compensation and Other Benefits.

                 2.1      Annual Salary.  The Company shall pay to the
Executive an annual salary at a rate of not less than one hundred forty
thousand dollars ($140,000) per year (the "Annual Salary"), subject to increase
at the sole discretion of the Board.  The Annual Salary shall be
<PAGE>   2
payable in accordance with the payroll policies of the Company as from time to
time in effect, but in no event less frequently than once each month, less such
deductions as shall be required to be withheld by applicable law and
regulations.

                 2.2      Incentive Bonus.

                          Executive Incentive Scheme.  The Executive shall be
entitled to participate in a Company Executive Incentive Scheme (the "Incentive
Scheme") which, subject to the conditions below, shall give the Executive the
potential to receive additional remuneration of up to 50% of salary each year.

                          2.2.1   The Company shall define the Incentive Scheme
annually on or before February 28th in each year for the Calendar year to which
it relates.

                          2.2.2   The Incentive Scheme may take the form of a
single Company goal, for example profit performance or several individual
targets such as productivity, etc., and may be varied each year.

                          2.2.3   Any remuneration earned under the Incentive
Scheme for a particular year shall be paid on or before 1st June of the
following calendar year.

                          2.2.4   The Executive shall receive remuneration
under the Incentive Scheme for 1997 equal to 50% of his Annual Salary if and
only if the Operating Profit Margin (as defined in Section 2.3 of this
Agreement) of the Marine Business (as defined in Section 2.3 of this Agreement)
for such year equals or exceeds 24% of revenues from the Marine Business.

                 2.3      Additional Incentive Bonus.

                          2.3.1   Grant of Additional Incentive Bonus.  The
Executive shall receive an additional incentive bonus, if earned, with respect
to the fiscal years ending during the Term (the "Additional Incentive Bonus");
provided, however, that an Additional Incentive Bonus for a fiscal year shall
only be payable if the Net After-Tax Profits (as hereinafter defined) for such
fiscal year exceed Base Profits (as hereinafter defined).

                          2.3.2   Definitions.

                          "Base Profits" shall mean 5% of gross revenues from
the Marine Business.

                          "Chief Financial Officer" means the chief financial
officer of Eagle.

                          "Eagle" shall mean Eagle Geophysical, Inc., a 
Delaware corporation.





                                       2
<PAGE>   3
                          "Marine Business" means the marine seismic data
acquisition business of the Company and its wholly owned subsidiaries and of
any other company that is a direct or indirect wholly owned subsidiary of
Eagle.

                          "Net After-Tax Profits" means the amount of net
profits of the Marine Business calculated by the Chief Financial Officer
applying U.S. generally accepted accounting principles and such other
accounting principles and assumptions as may be reasonable and taking into
account expenses attributable to allocable overhead (based on revenues) from
all other companies controlled by or under common control with the Company
engaged in the Marine Business and of such companies' parent corporation(s),
and subtracting therefrom all income tax liabilities attributable to the Marine
Business.

                          "Operating Profit Margin" means the amount of revenue
less cost of sales of the Marine Business calculated by the Chief Financial
Officer applying U.S. generally accepted accounting principles and such other
accounting principles and assumptions as may be reasonable.

                          2.3.3   Calculation of Bonus.  If Net After-Tax
Profits for a fiscal year exceed Base Profits for such fiscal year, the
Executive shall receive an Additional Incentive Bonus equal to the Applicable
Percentage set forth in the table below multiplied by the difference between
actual Net After-Tax Profits and Base Profits.

                  Net After-Tax Profits
               (percent of gross revenues)         Applicable Percentage
               ---------------------------         ---------------------

             greater than 5%, but less than               1.0%
                     or equal to 6%

             greater than 6%, but less than               1.5%
                     or equal to 7%

                    greater than 7%                       2.0%


                          2.3.4   Applicable Percentage if Significant Increase
in Revenues.  Notwithstanding the determination of Applicable Percentage in the
table set forth in Subsection 2.3.3 above, if gross revenues for a fiscal year
of the Marine Business increase by an amount of 20% or more as compared to
gross revenues for the previous fiscal year of the Marine Business, then the
Applicable Percentage for such fiscal year will be 2.0% so long as Net After
Tax Profits for such fiscal year exceed Base Profits for such fiscal year.





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<PAGE>   4
                          2.3.5  Payment of Additional Incentive Bonus.  The
Chief Financial Officer shall calculate the Net After-Tax Profits, and any
Additional Incentive Bonus payable to the Executive in connection therewith,
shall certify such calculations and shall deliver such calculations to the
Executive as soon as reasonably practicable after the end of each fiscal year,
but in any event within seventy-five (75) days following the end of such fiscal
year.  Any Additional Incentive Bonus payable hereunder shall be paid by the
Company to the Executive within seven (7) days of delivery of such calculations
by the Chief Financial Officer and in any event within eighty-two (82) days
following the end of the applicable fiscal year.  The additional remuneration
payable pursuant to Section 2.2 hereof and the Additional Incentive Bonus
payable pursuant to this Section 2.3 are hereinafter collectively referred as
the "Bonuses."

                 2.4      Grant of Option.  The Company agrees to grant the
Executive, pursuant to the terms of Eagle's Option Plan created in connection
with the initial public offering (the "IPO") of Eagle's common stock, options
to acquire seventy-five thousand (75,000) shares of Eagle's common stock, at an
exercise price equal to the IPO issue price.  Such stock options shall vest
over a period of three years, with stock options to acquire 25,000 shares
vesting on each of the first three anniversaries of the Effective Date, subject
to the terms of the Company's Option Plan.  The Company agrees to use all
reasonable efforts, consistent with the foregoing, to ensure that such stock
options meet all requirements for treatment as Incentive Stock Options under
the Internal Revenue Code of 1986, as amended, and that such stock option plan
meets the requirements of Rule 16b-3, promulgated under Section 16 of the
Securities Exchange Act of 1934, as amended (the "Act").

                 2.5      Vacation Policy.  The Executive shall be entitled to
a paid vacation of five weeks during each year of the Term.

                 2.6      Participation in Employee Benefit Plans.  The Company
agrees to permit the Executive during the Term, if and to the extent eligible,
to participate in any group life, hospitalization or disability insurance plan,
health program, pension plan, similar benefit plan or other so-called "fringe
benefits" of the Company (collectively, "Benefits") which may be available to
other executives of the Company on terms no less favorable to the Executive
than the terms offered to such other executives.  The Company agrees to use its
best efforts to obtain immediate coverage for the Executive upon the
commencement of the Term under its existing or newly adopted medical expense
and hospitalization plan for employees without premium surcharge and without
exclusions for disclosed preexisting conditions.  The Executive shall cooperate
with the Company in applying for such coverage, including submitting to a
physical exam and providing all relevant health and personal data.

                 2.7      General Business Expenses.  The Company shall pay or
reimburse the Executive for all expenses reasonably and necessarily incurred by
the Executive during the Term in the performance of the Executive's services
under this Agreement.  Such payment shall be made upon presentation of such
documentation as the Company customarily requires of its senior executive
employees prior to making such payments or reimbursements.





                                       4
<PAGE>   5
                 2.8      Company Car and Cellular Telephone.  The Company
shall pay the Executive a car allowance of five hundred and no/100 dollars
($500.00) per month, which the Executive may apply, in his discretion, to the
cost associated with purchasing or leasing, insuring, operating and maintaining
an automobile of the Executive's choice.  The Executive may use the automobile
for personal as well as business purposes.  The Company shall also furnish the
Executive with a cellular telephone of his choice and the Company shall pay all
charges in connection with the use thereof, other than charges for calls not
related to the Executive's duties hereunder.

         3.      Non-Competition, Confidentiality and Company Property.

                 3.1      Covenants Against Competition.  The Executive
acknowledges that (i) the Company is currently engaged in the business of
owning, managing and operating seismic data acquisition equipment and hiring
and managing crews to operate such equipment, which equipment and crews are
contracted or hired for the purpose of performing geological surveys onshore
and offshore (the "Company Business"); (ii) his work for the Company will give
him access to trade secrets of and confidential information concerning the
Company; and (iii) the agreements and covenants contained in this Agreement are
essential to protect the business and goodwill of the Company.  Accordingly,
the Executive covenants and agrees as follows:

                          3.1.1   Non-Compete.  As an independent covenant, and
in order to enforce the provisions of Sections 3.1.3 and 3.1.5 hereof and the
other provisions of this Agreement, the Executive agrees that he shall not
during the Restricted Period (as hereinafter defined) within a one hundred
(100) mile radius of any office of the Company or any of its affiliates,
including, without limitation, the locations specified from time to time
pursuant to Section 7.2 hereof and any field offices, directly or indirectly
(except in the Executive's capacity as an officer of the Company), (i) engage
or participate in the Company Business; (ii) enter the employ of, or render any
other services to, any person engaged in the Company Business except as
permitted hereunder; or (iii) become interested in any such person in any
capacity, including, without limitation, as an individual, partner,
shareholder, lender, officer, director, principal, agent or trustee except as
permitted hereunder; provided, however, that the Executive may own, directly or
indirectly, solely as an investment, securities of any person traded on any
national securities exchange or listed on the National Association of
Securities Dealers Automated Quotation System if the Executive is not a
controlling person of, or a member of a group which controls, such person and
the Executive does not, directly or indirectly, own 5% or more of any class of
equity securities, or securities convertible into or exercisable or
exchangeable for 5% or more of any class of equity securities, of such person.
As used herein, the "Restricted Period" shall mean a period commencing on the
date hereof and terminating upon the first to occur of (a) the date on which
the Company terminates or is deemed to terminate the Executive's employment
without Cause (as hereinafter defined), (b) the date the Executive terminates
or is deemed to terminate his employment pursuant to Section 4.6 hereof or (c)
the date of termination of this Agreement; provided, however, that if the
Company shall have terminated the Executive's employment for Cause and such
Cause in fact exists or if the Executive shall have terminated his employment





                                       5
<PAGE>   6
with the Company in breach of the terms of this Agreement, the Restricted
Period shall end one (1) year following the termination of the Executive's
employment hereunder.

                          3.1.2   Customers.  As an independent covenant, the
Executive also agrees to refrain during the Restricted Period, without written
permission from the Company, from diverting, taking, soliciting and/or
accepting on his own behalf or on the behalf of another person, firm, or
company, the business of any past or present customer of the Company, its
divisions, subsidiaries and/or other affiliated entities, or any identified
prospective or potential customer of the Company, its divisions, subsidiaries
and/or affiliated entities, whose identity became known to the Executive
through his employment by the Company.

                          3.1.3   Confidential Information.

                                  3.1.3.1  The Executive acknowledges that the
Company has a legitimate and continuing proprietary interest in the protection
of its confidential information and that it has invested substantial sums and
will continue to invest substantial sums to develop, maintain and protect
confidential information.  The Company agrees to provide the Executive access
to confidential information in conjunction with the Executive's duties,
including, without limitation, information of a technical and business nature
regarding the Company's past, current or anticipated business that may
encompass financial information, financial figures, trade secrets, customer
lists, details of client or consultant contracts, pricing policies, operational
methods, marketing plans or strategies, product development techniques or
plans, business acquisition plans, Company employee information, organizational
charts, new personnel acquisition plans, technical processes, designs and
design projects, inventions and research projects, ideas, discoveries,
inventions, improvements, trade secrets, design specifications, writings and
other works of authorship.  In exchange, as an independent covenant, the
Executive agrees not to make any unauthorized use, publication, or disclosure,
during or subsequent to his employment by the Company, of any Intellectual
Property of a confidential or trade secret nature, generated or acquired by him
during the course of his employment, except to the extent that the disclosure
of Intellectual Property Information is necessary to fulfill his
responsibilities as an employee of the Company.  The Executive understands that
confidential matters and trade secrets include information not generally known
by or available to the public about or belonging to the Company, its divisions,
subsidiaries, and related affiliates, or belonging to other companies to whom
the Company, its divisions, subsidiaries, and related affiliates, may have an
obligation to maintain information in confidence, and that authorization for
public disclosure may only be obtained through the Company's written consent.

                                  3.1.3.2  The Executive further agrees not to
disclose to the Company, or induce any personnel of the Company to use, any
confidential information, trade secret, or confidential material belonging to
others.

                                  3.1.3.3  The Executive agrees that the
covenants set forth in Sections 3.1.3.1 and 3.1.3.2 are independent covenants
and indefinite obligations binding upon the Executive both during and after the
termination of the Executive's relationship with the Company.





                                       6
<PAGE>   7
                          3.1.4   Property of the Company.  All memoranda,
notes, lists, records, engineering drawings, technical specifications and
related documents and other documents or papers (and all copies thereof)
relating to the Company, including such items stored in computer memories,
microfiche or by any other means, made or compiled by or on behalf of the
Executive after the date hereof, or made available to the Executive after the
date hereof relating to the Company, its affiliates or any entity which may
hereafter become an affiliate thereof, shall be the property of the Company,
and shall be delivered to the Company promptly upon the termination of the
Executive's employment with the Company or at any other time upon request;
provided, however, that the Executive's address books, diaries, chronological
correspondence files and rolodex files shall be deemed to be property of the
Executive.

                          3.1.5   Original Material.  The Executive agrees that
any inventions, discoveries, improvements, ideas, concepts or original works of
authorship relating directly to the Company Business, including without
limitation information of a technical or business nature such as ideas,
discoveries, designs, inventions, improvements, trade secrets, know-how,
manufacturing processes, product formulae, design specifications, writings and
other works of authorship, computer programs, financial figures, marketing
plans, customer lists and data, business plans or methods and the like, which
relate in any manner to the actual or anticipated business or the actual or
anticipated areas of research and development of the Company and its divisions,
subsidiaries, affiliates, or related entities, whether or not protectable by
patent or copyright, that have been originated, developed or reduced to
practice by the Executive alone or jointly with others during the Executive's
employment with the Company shall be the property of and belong exclusively to
the Company.  The Executive shall promptly and fully disclose to the Company
the origination or development by the Executive of any such material and shall
provide the Company with any information that it may reasonably request about
such material.  Either during the subsequent to the Executive's employment,
upon the request and at the expense of the Company or its nominee, and for no
remuneration in addition to that due the Executive pursuant to his employment
by the Company, but at no expense to him, the Executive agrees to execute,
acknowledge, and deliver to the Company or its attorneys any and all
instruments which, in the judgment of the Company or its attorneys, may be
necessary or desirable to secure or maintain for the benefit of the Company
adequate patent, copyright, and other property rights in the United States and
foreign countries with respect to any such inventions, improvements, ideas,
concepts, or original works of authorship embraced within this Agreement.

                          3.1.6   Employees of the Company and its Affiliates.
As an independent covenant, the Executive agrees to refrain during his
employment by the Company, and in the event of the termination of his
employment for any reason for a period of one year thereafter, from inducing or
attempting to influence any employee of the Company, its divisions,
subsidiaries and/or affiliated entities to terminate his employment.

                          3.1.7   Company's Interest.  The Executive further
agrees that these covenants are made to protect the legitimate business
interests of the Company, including interests in the Company's property
described in and pursuant to Section 3.1.4 and Section 3.1.5, and not to
restrict his mobility or to prevent him from utilizing his general technical
skills.  The





                                       7
<PAGE>   8
Executive understands as a part of these covenants that the Company intends to
exercise whatever legal recourse against him for any breach of this Agreement
and, in particular, for any breach of these covenants.

                 3.2      Rights and Remedies Upon Breach.  If the Executive
breaches, or threatens to commit a breach of, any of the provisions contained
in Section 3.1 of this Agreement (the "Restrictive Covenants"), the Company
shall have the following rights and remedies, each of which rights and remedies
shall be independent of the others and severally enforceable, and each of which
is in addition to, and not in lieu of, any other rights and remedies available
to the Company under law or in equity:

                          3.2.1   Specific Performance.  The right and remedy
to have the Restrictive Covenants specifically enforced by any court of
competent jurisdiction, it being agreed that any breach or threatened breach of
the Restrictive Covenants would cause irreparable injury to the Company and
that money damages would not provide an adequate remedy to the Company.

                          3.2.2   Accounting.  The right and remedy to require
the Executive to account for and pay over to the Company all compensation,
profits, monies, accruals, increments or other benefits derived or received by
the Executive as the result of any action constituting a breach of the
Restrictive Covenants.

                 3.3      Severability of Covenants.  The Executive
acknowledges and agrees that the Restrictive Covenants are reasonable and valid
in duration and geographical scope and in all other respects.  If any court
determines that any of the Restrictive Covenants, or any part thereof, is
invalid or unenforceable, the remainder of the Restrictive Covenants shall not
thereby be affected and shall be given full effect without regard to the
invalid portions.

                 3.4      Court Review.  If any court determines that any of
the Restrictive Covenants, or any part thereof, is unenforceable because of the
duration or geographical scope of, or scope of activities restrained by, such
provision, such court shall have the power to reduce the duration or scope of
such provision, as the case may be, and, in its reduced form, such provision
shall then be enforceable.

                 3.5      Enforceability in Jurisdictions.  The Company and the
Executive intend to and hereby confer jurisdiction to enforce the Restrictive
Covenants upon the courts of any jurisdiction within the geographical scope of
such Restrictive Covenants.  If the courts of any one or more of such
jurisdictions hold the Restrictive Covenants unenforceable by reason of the
breadth of such scope or otherwise, it is the intention of the Company that
such determination not bar or in any way affect the right of the Company to the
relief provided above in the courts of any other jurisdiction within the
geographical scope of such Restrictive Covenants, as to breaches of such
Restrictive Covenants in such other respective jurisdictions, such Restrictive
Covenants as they relate to each jurisdiction being, for this purpose,
severable into diverse and independent covenants.





                                       8
<PAGE>   9
         4.      Termination.

                 4.1      Termination Upon Death.  If the Executive dies during
the Term, this Agreement shall terminate, provided, however, that in any such
event, the Company shall pay to the Executive, or to his estate, any portion of
the Annual Salary that shall have been earned by the Executive prior to the
termination but not yet paid, any Benefits that have vested in the Executive at
the time of such termination as a result of his participation in any of the
Company's benefit plans shall be paid to the Executive, or to his estate or
designated beneficiary, in accordance with the provisions of such plan; and the
Company shall reimburse the Executive, or his estate, for any expenses with
respect to which the Executive is entitled to reimbursement pursuant to Section
2.7 of this Agreement, and the Executive's right to indemnification, payment or
reimbursement pursuant to Section 6 of this Agreement shall not be affected by
such termination and shall continue in full force and effect, both with respect
to proceedings that are threatened, pending or completed at the date of such
termination and with respect to proceedings that are threatened, pending or
completed after that date.

                 4.2      Termination With Cause.  The Company has the right,
at any time during the Term, subject to all of the provisions hereof,
exercisable by serving notice, effective on or after the date of service of
such notice as specified therein, to terminate the Executive's employment under
this Agreement and discharge the Executive with Cause.  If such right is
exercised, the Company's obligation to the Executive shall be limited solely to
the payment of unpaid Annual Salary accrued, together with unpaid Bonuses, if
any, and Benefits vested up to the effective date specified in the Company's
notice of termination.  As used in this Agreement, the term "Cause" shall mean
and include (i) chronic alcoholism or controlled substance abuse as determined
by a doctor reasonably selected by the Company, (ii) an act of proven fraud or
dishonesty on the part of the Executive with respect to the Company or its
subsidiaries; (iii) knowing and material failure by the Executive to comply
with material applicable laws and regulations relating to the business of the
Company or its affiliates; (iv) the Executive's continuing failure to
satisfactorily perform his duties hereunder (as reasonably determined by the
Board) or a material breach by the Executive of this Agreement except, in each
case, where such failure or breach is caused by the illness or other similar
incapacity or disability of the Executive; or (v) conviction of a crime
involving moral turpitude or a felony.  Prior to the effectiveness of
termination for Cause under subclause (i), (ii), (iii) or (iv) above, the
Executive shall be given 30 days' prior notice from the Board specifically
identifying the reasons which are alleged to constitute Cause for any
termination hereunder and an opportunity to be heard by the Board in the event
the Executive disputes such allegations.

                 4.3      Termination Without Cause.  The Company has the
right, at any time during the Term, subject to all of the provisions hereof,
exercisable by serving notice, effective on or after the date of service of
such notice as specified therein, to terminate the Executive's employment under
this Agreement and discharge the Executive without Cause.  If the Executive is
terminated during the Term without Cause (including any termination which is
deemed to be a constructive termination without Cause under Section 4.6
hereof), the Company's obligation to the Executive shall be limited solely to
(i) the payment, at the times and upon the terms





                                       9
<PAGE>   10
provided for herein, of (A) the Executive's Annual Salary and car allowance (as
set forth in Section 2.8 hereof) for the months remaining in the Term at the
time of such termination, based on the Annual Salary of the Executive in effect
on the date of termination (or, if the Company has reduced the Executive's
Annual Salary in breach of this Agreement, the Executive's Annual Salary before
such reduction), and (B) all unpaid bonuses and Benefits awarded or accrued up
to the date of termination, and (ii) the vesting of any unvested stock options
granted by the Company pursuant to Section 2.4 hereof.  In the event of a
termination by the Company without Cause within 180 days after Change of
Control (as hereinafter defined), including a constructive termination without
Cause pursuant to Section 4.6, the amounts due to the Executive pursuant to
this Section 4.3 shall be due and payable in one lump-sum payment within 60
days after such termination.  In all other cases, any amounts due to the
Executive pursuant to this Section 4.3 shall be due and payable as and when
they would have become due and payable absent such termination.

                 4.4      Termination by the Executive.  Any termination of
this Agreement by the Executive during the Term, except such termination as is
deemed to be a constructive termination without Cause by the Company under
Section 4.6 of this Agreement, shall be deemed to be a breach of the terms of
this Agreement for the purposes of Section 3.1.1 hereof and shall entitle the
Company to discontinue payment of all Annual Salary, Bonuses and Benefits
accruing from and after the date of such termination.

                 4.5      Termination upon Disability.  If during the Term the
Executive becomes physically or mentally disabled, whether totally or
partially, as determined by a physician reasonably selected by the Company, so
that the Executive is unable substantially to perform his services hereunder
for (i) a period of four consecutive months, or (ii) for shorter periods
aggregating six months during any twelve-month period, the Company may at any
time after the last day of the four consecutive months of disability or the day
on which the shorter periods of disability equal an aggregate of six months, by
written notice to the Executive, terminate the Executive's employment hereunder
and discontinue payments of the Annual Salary, Bonuses and Benefits accruing
from and after the date of such termination.  The Executive shall be entitled
to the full compensation payable to him hereunder for periods of disability
shorter than the periods specified in clauses (i) and (ii) of the previous
sentence.

                 4.6      Constructive Termination Without Cause.
Notwithstanding any other provision of this Agreement, the Executive's
employment under this Agreement may be terminated during the Term by the
Executive, which shall be deemed to be constructive termination by the Company
without Cause, if one of the following events shall occur without the consent
of the Executive: (i) a failure to elect or reelect or to appoint or reappoint
the Executive to the office of Vice President - U.S. Offshore Operations of the
Company or other material change by the Company of the Executive's functions,
duties or responsibilities which change would reduce the ranking or level,
dignity, responsibility, importance or scope of the Executive's position with
the Company from the position and attributes thereof described in Section 1
above; (ii) the liquidation, dissolution, consolidation or merger of the
Company, or transfer of all or substantially all of its assets, other than a
transaction in which a successor





                                       10
<PAGE>   11
corporation with a net worth at least equal to that of the Company assumes this
Agreement and all obligations and undertakings of the Company hereunder; (iii)
a reduction in the Executive's fixed salary; (iv) the failure of the Company to
continue to provide the Executive with office space, related facilities and
secretarial assistance that are commensurate with the Executive's
responsibilities to and position with the Company; (v) the notification by the
Company of the Company's intention not to observe or perform one or more of the
obligations of the Company under this Agreement; (vi) the failure by the
Company to indemnify, pay or reimburse the Executive at the time and under the
circumstances required by Section 6 of this Agreement; or (vii) the occurrence
of any other material breach of this Agreement by the Company or any of its
subsidiaries.  Any such termination shall be made by written notice to the
President of the Company, specifying the event relied upon for such termination
and given within 60 days after such event.  Any constructive termination shall
be effective 60 days after the date the President of the Company has been given
such written notice setting forth the grounds for such termination with
specificity; provided, however, that the Executive shall not be entitled to
terminate this Agreement in respect of any of the grounds set forth above if
within 60 days after such notice the action constituting such ground for
termination is no longer continuing.  A constructive termination by the Company
without Cause shall terminate the Restrictive Period hereunder.

                 4.7      For the purposes hereof, a "Change of Control of the
Company" shall be deemed to have occurred if after the effective date and the
IPO (i) any "person" (as such term is used in Sections 13(d) and 14(d) of the
Act) is or becomes the "beneficial owner" (as defined in Rule 13d-3 under the
Act), directly or indirectly, of securities of the Company representing 50% or
more of the combined voting power of the Company's then outstanding securities
without the prior approval of at least a majority of the members of the Board
in office immediately prior to such person attaining such percentage interest;
(ii) there occurs a proxy contest or a consent solicitation, or the Company is
a party to a merger, consolidation, sale of assets, plan of liquidation or
other reorganization not approved by at least a majority of the members of the
Board in office, as a consequence of which members of the Board in office
immediately prior to such transaction or event constitute less than a majority
of the Board thereafter; or (iii) during any period of two consecutive years,
other than as a result of an event described in clause (ii) of this Section
4.7, individuals who at the beginning of such period constituted the Board
(including for this purpose any new director whose election or nomination for
election by the Company's stockholders was approved by a vote of at least a
majority of the directors then still in office who were directors at the
beginning of such period) cease for any reason to constitute at least a
majority of the Board.

         5.      Insurance.  The Company may, from time to time, apply for and
take out, in its own name and at its own expense, naming itself or one or more
of its affiliates as the designated beneficiary (which it may change from time
to time), policies for life, health, accident, disability or other insurance
upon the Executive in any amount or amounts that it may deem necessary or
appropriate to protect its interest.  The Executive agrees to aid the Company
in procuring such insurance by submitting to medical examinations and by
filling out, executing and delivering such applications and other instruments
in writing as may reasonably be required by an insurance





                                       11
<PAGE>   12
company or companies to which any application or applications for insurance may
be made by or for the Company.

         6.      Indemnification.

                 6.1      The Company shall, to the maximum extent not
prohibited by law, indemnify the Executive if he is made, or threatened to be
made, a party to any threatened, pending or completed action, suit or
proceeding, whether civil, criminal, administrative or investigative, including
an action by or in the right of the Company to procure a judgment in its favor
(collectively, a "Proceeding"), by reason of the fact that the Executive is or
was a director or officer of the Company, or is or was serving in any capacity
at the request of the Company for any other corporation, partnership, joint
venture, trust, employee benefit plan or other enterprise, against judgments,
fines, penalties, excise taxes, amounts paid in settlement and costs, charges
and expenses (including attorneys' fees and disbursements) paid or incurred in
connection with any such Proceeding.

                 6.2      The Company shall, from time to time, reimburse or
advance to the Executive the funds necessary for payment of expenses, including
attorneys' fees and disbursements, incurred in connection with any Proceeding
in advance of the final disposition of such Proceeding; provided, however,
that, if required by the Texas Business Corporation Act, such expenses incurred
by or on behalf of the Executive may be paid in advance of the final
disposition of a Proceeding only upon receipt by the Company of an undertaking,
by or on behalf of the Executive, to repay any such amount so advanced if it
shall ultimately be determined by final judicial decision from which there is
no further right of appeal that the Executive is not entitled to be indemnified
for such expenses.

                 6.3      The right to indemnification and reimbursement or
advancement of expenses provided by, or granted pursuant to, this Section 6
shall not be deemed exclusive of any other rights which the Executive may now
or hereafter have under any law, by-law, agreement, vote of stockholders or
disinterested directors or otherwise, both as to action in his official
capacity and as to action in another capacity while holding such office.

                 6.4      The right to indemnification and reimbursement or
advancement of expenses provided by, or granted pursuant to, this Section 6
shall continue as to the Executive after he has ceased to be a director or
officer and shall inure to the benefit of the heirs, executors and
administrators of the Executive.

                 6.5      The Company shall purchase and maintain director and
officer liability insurance on such terms and providing such coverage as the
Board determines is appropriate, and the Executive shall be covered by such
insurance on the same basis as the other directors and executive officers of
the Company.

                 6.6      The right to indemnification and reimbursement or
advancement of expenses provided by, or granted pursuant to, this Section 6
shall be enforceable by the Executive





                                       12
<PAGE>   13
in any court of competent jurisdiction.  The burden of proving that such
indemnification or reimbursement or advancement of expenses is not appropriate
shall be on the Company.  Neither the failure of the Company (including its
board of directors, independent legal counsel, or its stockholders) to have
made a determination prior to the commencement of such action that such
indemnification or reimbursement or advancement of expenses is proper in the
circumstances nor an actual determination by the Company (including its board
of directors, independent legal counsel, or its stockholders) that the
Executive is not entitled to such indemnification or reimbursement or
advancement of expenses shall constitute a defense to the action or create a
presumption that the Executive is not so entitled.  The Executive shall also be
indemnified for any expenses incurred in connection with successfully
establishing his right to such indemnification or reimbursement or advancement
of expenses, in whole or in part, in any such proceeding.

                 6.7      If the Executive serves (i) another corporation of
which a majority of the shares entitled to vote in the election of its
directors is held by the Company, (ii) another corporation which owns a
majority of the shares entitled to vote in the election of the directors of the
Company (a "Parent Corporation") or of which a majority of the shares entitled
to vote in the election of its directors is held by the Parent Corporation or
(iii) any employee benefit plan of the Company or any corporation referred to
in clause (i) or (ii), in any capacity, then he shall be deemed to be doing so
at the request of the Company.

                 6.8      The right to indemnification or reimbursement or
advancement of expenses shall be interpreted on the basis of the applicable law
in effect at the time of the occurrence of the event or events giving rise to
the applicable Proceeding.

         7.      Other Provisions.

                 7.1      Certain Definitions.  As used in this Agreement, the
following terms have the following meanings unless the context otherwise
requires:

                          (i) "affiliate" with respect to the Company means any
         other person controlled by or under common control with the Company
         but shall not include any stockholder or director of the Company, as
         such.

                          (ii) "person" means any individual, corporation,
         partnership, firm, joint Company, association, joint-stock company,
         trust, unincorporated organization, governmental or regulatory body or
         other entity.

                          (iii) "subsidiary" means any corporation 50% or more
         of the voting securities of which are owned directly or indirectly by
         the Company.

                 7.2      Notices.  Any notice or other communication required
or permitted hereunder shall be in writing and shall be delivered personally,
telegraphed, telexed, sent by facsimile transmission or sent by certified,
registered or express mail, postage prepaid.  Any such





                                       13
<PAGE>   14
notice shall be deemed given when so delivered personally, telegraphed, telexed
or sent by facsimile transmission or, if mailed, on the date of actual receipt
thereof, as follows:

                          (i)     if to the Company, to:

                                  Eagle Geophysical Offshore, Inc.
                                  50 Briar Hollow Lane
                                  West Building, 6th Floor
                                  Houston, Texas  77027
                                  Attention:  President

                                  with a copy to:

                                  Gardere Wynne Sewell & Riggs, L.L.P.
                                  333 Clay Avenue, Suite 800
                                  Houston, Texas  77002
                                  Attention:  N. L. Stevens III

                          (ii)    if to the Executive, to:

                                  David Burns
                                  2203 Crystal Hills Drive
                                  Houston, Texas 77077

Any party may change its address for notice hereunder by notice to the other
party hereto.

                 7.3      Entire Agreement.  This Agreement contains the entire
agreement between the parties with respect to the subject matter hereof and
supersedes all prior agreements, written or oral, with respect thereto.

                 7.4      Waivers and Amendments.  This Agreement may be
amended, superseded, canceled, renewed or extended, and the terms and
conditions hereof may be waived, only by a written instrument signed by the
parties or, in the case of a waiver, by the party waiving compliance.  No delay
on the part of any party in exercising any right, power or privilege hereunder
shall operate as a waiver thereof.  Nor shall any waiver on the part of any
party of any such right, power or privilege hereunder, nor any single or
partial exercise of any right, power or privilege hereunder, preclude any other
or further exercise thereof or the exercise of any other right, power or
privilege hereunder.

                 7.5      Governing Law.  This Agreement shall be governed by
and construed in accordance with the laws of the State of Texas (without giving
effect to the choice of law provisions thereof) where the employment of the
Executive shall be deemed, in part, to be performed and enforcement of this
Agreement or any action taken or held with respect to this Agreement shall be
taken in the courts of appropriate jurisdiction in Houston, Texas.





                                       14
<PAGE>   15
                 7.6      Assignment.  This Agreement, and any rights and
obligations hereunder, may not be assigned by the Executive and may be assigned
by the Company (subject to Section 4.6 (iii) hereof) only to a successor by
merger or purchasers of substantially all of the assets of the Company.

                 7.7      Counterparts.  This Agreement may be executed in
separate counterparts, each of which when so executed and delivered shall be
deemed an original, but all of which together shall constitute one and the same
instrument.

                 7.8      Headings.  The headings in this Agreement are for
reference purposes only and shall not in any way affect the meaning or
interpretation of this Agreement.

                 7.9      Validity Contest.  The Company shall promptly pay any
and all legal fees and expenses incurred by the Executive from time to time as
a direct result of the Company's contesting the due execution, authorization,
validity or enforceability of this Agreement.

                 7.10     Binding Agreement.  This Agreement shall inure to the
benefit of and bit binding upon the Company and its respective successors and
assigns and the Executive and his legal representatives.

         IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first above written.

                                               EAGLE GEOPHYSICAL OFFSHORE, INC.


                                               By:____________________________
                                                     Name:____________________
                                                     Title:___________________

                                               EXECUTIVE


                                               _______________________________
                                                     David Burns





                                       15

<PAGE>   1
                                                                   EXHIBIT 10.45

                  OPERATING LEASE OF MARINE SEISMIC EQUIPMENT


         This lease (the "Lease") dated as of July 1, 1996, is between SEITEL
GEOPHYSICAL, INC., a Delaware corporation (the "Lessor") and HORIZON
EXPLORATION LIMITED, a United Kingdom corporation (the "Lessee").

         WHEREAS, the Lessor is the owner of the marine seismic equipment more
fully described in the purchase orders attached hereto as Exhibit A (the
"Equipment"); and

         WHEREAS, the Lessee is the charterer under a time charter with The
Shanghai Bureau of Marine Geological Survey, dated April 12, 1994 of the
Bahamas flag seismic data recording vessel DISCOVERER, Official No. 711122 (the
"DISCOVERER"); and

         WHEREAS, the Lessee is the charterer under a time charter with
Tidewater Marine, Inc., dated February 9, 1996 of the U.S. flag seismic data
recording vessel ABSHIRE TIDE, Official No. 663944 (the "ABSHIRE TIDE"); and

         WHEREAS, the Lessee is the charterer under a time charter with Morr
Vessel Management Ltd., dated February 4, 1981 of the UK flag seismic data
recording vessel PACIFIC HORIZON, Official No. 6413807 (the "PACIFIC HORIZON");
and

         WHEREAS, the Lessee is the charterer under a time charter with
Simon-Horizon Limited, dated July 15, 1994 of the Bahamas flag seismic data
recording vessel SIMON LABRADOR, Official No. 715224 (the "SIMON LABRADOR," and
collectively with the DISCOVERER, the ABSHIRE TIDE, and the PACIFIC HORIZON,
the "Vessels"); and

         WHEREAS, the Lessee wishes to lease the Equipment from the Lessor in
order to improve the seismic data acquisition capabilities of the Vessels;

         NOW THEREFORE, in consideration of the above recitals and for other
good and valuable consideration, the receipt and sufficiency of which is hereby
acknowledged, the parties agree as follows:

         1.      LEASE.  (a) Subject to the provisions hereof, the Lessor
hereby leases to the Lessee and the Lessee hereby leases from the Lessor the
Equipment for a fixed term of five (5) years beginning on the date hereof.

         (b)     The term of this Lease may be extended for successive periods
of one (1) year each upon written agreement of the parties hereto no later than
thirty (30) days prior to termination.

         2.      RENT.  The Equipment shall be leased at the monthly rental of
U.S.$138,000.00 for the initial term specified in Section 1(a) above ("Rent").
The Rent for any extension terms shall be agreed to by the parties hereto.  The
Lessee agrees to pay the Lessor, or to its order,
<PAGE>   2
Rent beginning on July 31, 1996 and thereafter on the last day of each
successive month during the term of this Lease.

         3.      DELIVERY AND DISCLAIMER OF WARRANTIES. (a) As of the date
hereof, Lessee confirms that the Equipment is in good and satisfactory
operating condition, and has accepted delivery of the Equipment in such
condition.  The Lessor hereby warrants that as of the date hereof it has good
and marketable title to the Equipment free and clear of claims by any third
party (other than the security interest granted in favor of NationsBank in
connection with the acquisition of the Equipment by Lessor, referred to herein
as the "Bank Lien") and that it has the right to lease the Equipment.  The
Lessor further warrants that during the term of this Lease, so long as the
Lessee is not in default of any other provisions thereof, the Lessee shall
enjoy use of the Equipment free and clear of any person claiming title to or an
interest in the Equipment by reason of the acts or omissions of the Lessor.

         (b) THE LESSOR MAKES NO OTHER REPRESENTATIONS OR WARRANTIES, EXPRESS
OR IMPLIED AS TO THE EQUIPMENT INCLUDING AS TO ITS VALUE, CONDITION, DESIGN,
OPERATION, MERCHANTABILITY OR FITNESS FOR USE FOR ANY PARTICULAR PURPOSE, AS TO
THE ABSENCE OF LATENT OR OTHER DEFECTS, WHETHER OR NOT DISCOVERABLE, AS TO THE
ABSENCE OF ANY INFRINGEMENT OF ANY PATENT, TRADEMARK OR COPYRIGHT OR ANY OTHER
REPRESENTATION OR WARRANTY WHATSOEVER, EXPRESS OR IMPLIED; PROVIDED, HOWEVER,
THAT DURING THE TERM OF THIS LEASE THE LESSOR HEREBY TRANSFERS AND ASSIGNS TO
THE LESSEE ALL MANUFACTURERS' WARRANTIES CONCERNING THE EQUIPMENT AND WILL
ASSIST THE LESSEE WITH ANY CLAIMS AGAINST THE MANUFACTURER OF THE EQUIPMENT FOR
DEFECTIVE OR NON-PERFORMING PRODUCT OR DESIGN.

         4.      USE AND OPERATION.  So long as no Event of Default shall occur
and be continuing, the Lessee shall have the full use of the Equipment and may
employ the Equipment in any lawful trade or commerce; provided, however, that
the Lessee covenants and agrees that it will not permit the Equipment to be
incorporated or installed in or attached to the Vessels or any other vessel,
building or real property in such manner as to become part of or subject to any
liens, security interest or encumbrances on the Vessels, any other vessel or
any building or real property or so as to preclude the removal of the Equipment
from the Vessels or any other location without material injury to the Equipment
(it being the intention of the parties that the Equipment is, and shall remain,
personal property throughout the term of this Lease); and provided, further,
that the Equipment shall not be used or operated in any manner contrary to any
applicable law, treaty or convention, or any rule or regulation issued
thereunder.  The Lessee, at its sole cost and expense, shall perform all
routine maintenance and repairs on the Equipment and all major repairs or
overhauls of the Equipment required to keep the Equipment in good operating
condition.

         5.      OWNERSHIP.  This agreement is a lease, and no title, equity or
right in or to the Equipment shall pass to the Lessee except the rights herein
expressly granted, nor shall the Lessee have any lien or charge on the
Equipment.





                                       2
<PAGE>   3
         6.      ALTERATIONS.  With the prior written consent of the Lessor,
the Lessee shall have the right, at its sole expense, to make alterations,
modifications, additions or attachments to the Equipment so long as the value
or usefulness of the Equipment is not reduced thereby.  Except as otherwise
agreed by the Lessor, all alterations, modifications, additions and attachments
of whatsoever kind or nature made to the Equipment shall immediately become the
property of the Lessor and shall be subject to all terms of this Lease.

         7.      LOSS AND DAMAGE.  (a)  The Lessee shall assume and bear the
risk of loss and damage to the Equipment and all component parts thereof from
any cause whatsoever whether or not covered by insurance.  No loss or damage to
the Equipment or any component part thereof shall impair any obligations of the
Lessee under this Lease which shall continue in full force and effect as
hereinafter expressly provided.  The Lessee shall repair or cause to be
repaired all damage to the Equipment.

         (b)  In the event that all or part of the Equipment shall, as a result
of any cause, other than an act or omission of the Lessor, become lost, stolen,
destroyed or rendered irreparably unusable or damaged, as determined by the
Lessee, then the Lessee shall, within ten (10) days after it shall have made
such determination, fully inform the Lessor of such loss or damage and shall
pay the Lessor the then casualty value of the equipment, together with all Rent
and any other sums past due or becoming due to and including the date of such
payment.  Upon payment of said amounts this Lease shall terminate.

         (c)  If the Vessels or the Equipment is taken by requisition or
governmental action as a result of the Lessee's operation of the Vessels or by
virtue of any actions arising by, through or under the Lessee or its agents or
contractors, the Lessee shall be responsible for obtaining the release of the
Equipment, and Rent shall continue until the Lessor receives any insurance
proceeds for such requisition.

         (d)     NOTWITHSTANDING ANY PROVISIONS TO THE CONTRARY CONTAINED IN
THIS SECTION 7 OR ELSEWHERE IN THIS LEASE, IF THERE IS ANY PARTIAL OR TOTAL OR
CONSTRUCTIVE OR COMPROMISED TOTAL LOSS OF ANY OF THE VESSELS OR THE EQUIPMENT
DURING THE PERIOD OF THIS LEASE, THE LESSEE HEREBY AGREES TO INDEMNIFY AND HOLD
HARMLESS THE LESSOR FOR AND AGAINST ANY INSURANCE DEDUCTIBLES AND UNINSURED
LOSSES INCURRED BY THE LESSEE.  ALL SUCH INSURANCE SHORTFALLS SHALL BE PAID BY
LESSEE TO LESSOR ON DEMAND.

         (e)     If, at the time of scheduled redelivery of the Equipment under
this Lease, the Equipment is damaged or otherwise in need of repair or other
work to restore it to pre-hire condition as set forth herein the Lessee shall
continue to pay Rent during such repairs and other work and the Equipment shall
not be considered redelivered until it has been restored to said pre-hire
condition.

         8.      INSURANCE.  Commencing on the date hereof and continuing until
the Lessee has redelivered possession of the Equipment to the Lessor or as
otherwise herein provided, whether or not this Lease has terminated as to the
Equipment, the Lessee, at its expense, agrees to obtain and maintain all risk
public liability and property damage insurance for the Equipment





                                       3
<PAGE>   4
in an amount and with insurers satisfactory to the Lessor; provided, however,
that property damage insurance on the Equipment shall always be in an amount
equal to the casualty value of the Equipment as determined by the Lessor; which
casualty value shall be U.S.$5,902,374.00 on the date hereof.  The insurance
obtained pursuant to this Section 8 shall not be excess over other coverage but
shall be primary insurance up to and including the stated policy limits and
shall cover the interests of both the Lessor and the Lessee in the Equipment,
or as the case may be, shall protect both the Lessor and the Lessee in respect
to all risks arising out of the condition, delivery, installation, maintenance,
use or operation of the Equipment.  All such insurance shall provide for ten
(10) days prior written notice to the Lessor of cancellation, restriction or
reduction of coverage.  The Lessee hereby irrevocably appoints the Lessor as
the Lessee's attorney-in-fact to make claim for, receive payment of and execute
and indorse all documents, checks or drafts for loss or damage under any
insurance policy issued on the Equipment.  In the event the Equipment shall
sustain a casualty which does not render the Equipment irreparable or unusable
for its intended use, the Lessee shall have the right to the insurance proceeds
upon presentation to the Lessor of a repair estimate or survey showing the
extent of damage and the cost of repair thereof.  Upon receipt of such
insurance proceeds, the Lessee is obligated to apply the proceeds to repair of
the Equipment.  In the event of a casualty which renders the Equipment
irreparable or unusable for its intended use, the Lessor shall have the right
to the insurance proceeds with respect to the Equipment.

         9.      TAXES.  The Lessee shall be responsible for the payment and
discharge of all license or registration fees, assessments, sales and use
taxes, rental taxes, personal property taxes and other taxes (except taxes on
the Lessor's income or profits), now or hereafter imposed by any federal, state
or local government upon the Equipment or upon the leasing, renting, possession
or use thereof (whether the same be assessed on the Lessor or the Lessee).  The
Lessor shall pay any and all such taxes billed or assessed to it, however, if
any such tax is by law to be assessed or billed to the Lessor, the Lessee
agrees to reimburse the Lessor therefor.  The Lessee shall directly pay any
such taxes billed or assessed to it.  The Lessee shall pay to the Lessor the
amount of any taxes remitted by the Lessor within ten (10) days of notice
thereof.  The Lessee upon notice to the Lessor may in the Lessee's own name,
contest or protest any such taxes.  The Lessee shall, in addition, be
responsible to the Lessor for the payment and discharge of any penalties or
interest.

         10.     LIENS AND ENCUMBRANCES.  (a) The Lessee will at all times
protect and defend, at its own cost and expense, the title of the Lessor to the
Equipment and keep the Equipment free and clear from all claims, liens and
other encumbrances, except (i) the rights of the Lessor hereunder, (ii) liens
for taxes either not yet due or being contested in good faith by appropriate
proceedings so long as such proceedings do not involve any danger of the sale,
forfeiture or loss of the Equipment, (iii) inchoate materialmen's, mechanics',
workman's, repairman's, employees' or other like liens arising in the ordinary
course of business and not delinquent, and (iv) the Bank Lien.  Notwithstanding
the foregoing, nothing contained in this Lease shall require the Lessee to take
any action to protect and defend the Equipment from any liens, claims or other
encumbrances arising out of the acts or omissions of the Lessor or any
shareholder, affiliate, employee, agent or representatives of the Lessor.

         (b)  Neither the Lessee nor the masters of the Vessels nor any other
person shall have the right, power or authority to create, incur or permit to
exist upon the Equipment any lien,





                                       4
<PAGE>   5
charge or encumbrance.  As of the date hereof, the Lessee has placed, and all
at times during the term of this Lease shall keep prominently displayed on the
Equipment a legible notice on a metal plate not less than six inches wide by
nine inches high reading as follows:

         "This seismic equipment is owned by SEITEL GEOPHYSICAL, INC., is not a
         part of this vessel and cannot be encumbered by any liens arising
         against this vessel."

         11.     INDEMNITY.  THE LESSEE ASSUMES ALL RISK OF LIABILITY FOR ANY
DAMAGE OR LOSS TO THE EQUIPMENT, INCLUDING, BUT NOT LIMITED TO, ANY ARISING
FROM LIENS IMPOSED ON THE EQUIPMENT IN VIOLATION OF SECTION 10 ABOVE OR ARISING
FROM THE INCORPORATION OF THE EQUIPMENT INTO THE VESSELS, ANY OTHER VESSEL OR
ANY REAL PROPERTY IN VIOLATION OF SECTION 4 ABOVE, AND FOR INJURIES TO OR
DEATHS OF PERSONS AND/OR LOSS OF OR DAMAGE TO PROPERTY (INCLUDING, WITHOUT
LIMITATION, DAMAGE TO THE ENVIRONMENT AND PROPERTY, DUE TO POLLUTION OR THE
RELEASE OF HAZARDOUS WASTES OF ANY KIND) ARISING FROM OR INCIDENT TO THE
EQUIPMENT'S USE OR OPERATION, WHETHER SUCH INJURIES OR DEATHS INVOLVE THE
LESSEE'S EMPLOYEES OR OTHER PERSONS, AND WHETHER SUCH LOSS OR DAMAGE INVOLVES
PROPERTY OF THE LESSEE AND ITS EMPLOYEES AND CONTRACTORS OR OF OTHERS.  THE
LESSEE WILL INDEMNIFY AND HOLD HARMLESS THE LESSOR (AND ANY FIRM OR CORPORATION
SUBSIDIARY TO, AFFILIATED WITH OR UNDER THE SAME MANAGEMENT AS THE LESSOR)
AGAINST AND FROM ALL LOSS, DAMAGE, LIABILITY AND EXPENSE, INCLUDING ATTORNEYS'
FEES, ARISING FROM OR IN CONNECTION WITH SUCH INJURY, DEATH, LOSS OR DAMAGE TO
PROPERTY OR THE ENVIRONMENT, HOWSOEVER CAUSED AND WHETHER RESULTING IN WHOLE OR
IN PART FROM THE NEGLIGENCE OR OTHER FAULT OF EITHER PARTY, BUT ONLY INSOFAR AS
SAID LOSS, DAMAGE, LIABILITY OR EXPENSE ARISES IN CONNECTION WITH THE LESSEE'S
ACCEPTANCE, USE, POSSESSION, OPERATION, OR RETURN OF THE EQUIPMENT UNDER THIS
LEASE.

         12.     LESSOR MAY PERFORM.  Should the Lessee fail to make any
payment or do any act as provided by this Lease, then the Lessor shall have the
right (but not the obligation), without notice to the Lessee and without
releasing the Lessee from any obligations hereunder, to make or do the same or
to make advances to preserve the Equipment or the Lessor's title thereto and to
pay, purchase, contest or compromise any insurance premium, encumbrance,
charge, tax, lien or other sum which in the judgment of the Lessor appears to
affect the Equipment, and in exercising such rights, the Lessor may incur any
reasonable liability and expend reasonable amounts necessary therefor.  All
sums so incurred or expended by the Lessor shall be due and payable by the
Lessee within ten (10) days of notice thereof.

         13.     ASSIGNMENT AND SUBLEASE.  Any transfer, assignment, sublease,
conveyance or pledge of the Lessee's interest in and to this Lease or the
Equipment, whether by operation of law or otherwise, without the prior written
consent of the Lessor, shall be void.  The Lessor, its successors or assigns,
may assign this Lease or grant a security interest therein or in the Equipment
in whole or in part.  However, unless the Lessee receives written notice of





                                       5
<PAGE>   6
such assignment, the Lessee shall have no obligation to pay Rent due pursuant
to this Lease to any party other than the Lessor.

         14.     SURRENDER OF THE EQUIPMENT.  At the Lessor's request upon
expiration or earlier termination of this Lease or any renewal or extension
thereof, the Lessee shall return the Equipment to the Lessor in good condition
and working order, ordinary wear and tear resulting from use thereof excepted,
by delivery of the Equipment at the Lessee's cost and expense to a mutually
agreed upon place on the Gulf Coast of the United States.

         15.     EVENTS OF DEFAULT.  The occurrence of any of the following
events, shall constitute an Event of Default under this Lease:

         (a)     the nonpayment by the Lessee of any Rent when due, or the
                 nonpayment by the Lessee of any other sum required hereunder
                 to be paid by the Lessee which nonpayment continues for a
                 period of five (5) days following written notice thereof from
                 the Lessor;

         (b)     the failure of the Lessee to perform any other term, covenant
                 or condition of this Lease which is not cured within ten (10)
                 days after written notice thereof from the Lessor;

         (c)     the Lessee ceases doing business as a going concern, is
                 insolvent, makes an assignment for the benefit of creditors,
                 admits in writing its inability to pay its debts as they
                 become due, files a voluntary petition in bankruptcy, is
                 subjected to an involuntary petition in bankruptcy which is
                 not released or dismissed within thirty (30) days after
                 filing, is adjudicated bankrupt or insolvent, files or has
                 filed against it a petition seeking any reorganization,
                 arrangement or composition, under any present or future
                 statute, law or regulation;

         (d)     any of the Lessee's representations or warranties made in this
                 Lease or in any statement or certificate at any time given in
                 writing pursuant to this Lease or in connection herewith shall
                 be false or misleading in any material respect; or

         (e)     the Lessee defaults under or otherwise has accelerated any
                 material obligation, credit agreement, loan agreement,
                 conditional sales contract, lease, indenture or debenture or
                 the Lessee defaults under any other agreement with the Lessor.

         16.     REMEDIES.  (a)  Should any Event of Default occur and be
continuing, the Lessor may, without notice to or demand upon the Lessee,
without retaking possession of the Equipment, accelerate and cause to become
immediately due and payable all Rent and other sums payable under the terms
hereof; or may retake (by the Lessor, independent contractors, or by requiring
the Lessee to assemble the Equipment for the Lessor at a location designated by
the Lessor) possession of the Equipment (without liability to the Lessee
therefor which is hereby expressly waived) and either:

         (i)     retain possession of the Equipment until the Lessor shall
                 terminate the Lessee's interest in the Equipment by giving the
                 Lessee written notice to that effect, in





                                       6
<PAGE>   7
         which event the Lessee shall be liable for all rents and other sums
         accrued and unpaid prior to such termination;

         (ii)    lease the Equipment to a third party for the account of the
                 Lessee and recover from the Lessee any deficiency between the
                 rents provided for herein and those received from such third
                 party;

         (iii)   sell the Equipment at public or private sale, in which event
                 the Lessee shall pay to the Lessor upon demand the amount, if
                 any, by which the net proceeds of such sale shall be less than
                 the casualty value of the Equipment; or

         (iv)    recover from the Lessee the excess of the rents and charges
                 provided for in this Lease for the balance of the term over
                 the then reasonable rental value of the Equipment for the same
                 period.

         (b)     The Lessor may enforce any one or more of the remedies
hereunder successively or concurrently, and any such action shall not prevent
the Lessor from pursuing any further remedy the Lessor may have hereunder or at
law or in equity.  Time and exactitude of each of the terms and conditions
hereof are hereby declared to be of the essence of this Lease.  The Lessor may
accept past due payments without modifying the terms of this Lease and without
waiving any further rights.  The Lessor shall not be obligated to sell or
release the Equipment.  Nevertheless, in the event of a public sale the Lessor
may bid upon and purchase the Equipment.

         17.     INSPECTION BY LESSOR.  The Lessor, its agents, representatives
or employees, shall at any and all reasonable times during regular working
hours have the right to board the Vessels for the purpose of inspecting the
Equipment and observing its use.

         18.     COSTS AND ATTORNEYS' FEES.  In the event of any action at law
or a suit in equity by reason of the Lessee's breach of this Lease or any
governmental examination or investigation of the Lessee, which requires the
Lessor's participation and which participation would not be required but for
this Lease, or pursuant to the Lessor exercising any of its rights provided for
in this Lease or by applicable law, the Lessee, in addition to all other sums
which the Lessee may be called upon to pay under the provisions of this Lease,
will pay to the Lessor its reasonable costs of collection or other reasonable
out-of-pocket costs and expenses and attorneys' fees.

         19.     INTEREST AND SERVICE CHARGES.  Any amounts required to be paid
by the Lessee pursuant to this Lease, and not paid when due (except payments of
taxes being properly contested) shall bear interest at the rate of 1.25% per
month until payment.

         20.     OFFSETS.  The Rent and all other sums payable hereunder shall
be paid without notice, demand, counterclaim, setoff, deduction or defense and
without abatement, suspension, deferment, diminution or revocation, and the
obligations and liabilities of the Lessee under this Lease shall not be
affected for any reason.  This Lease shall not be terminable by the Lessee in
whole or in part except as specifically provided in Sections 7 and 16 of this
Lease.





                                       7
<PAGE>   8
         21.     HEADINGS.  Section headings herein are used for convenience
only and shall not otherwise affect the provisions of this Lease.

         22.     EFFECT OF WAIVER.  No failure or delay on the part of the
Lessor in the exercise of any remedy, power, right or privilege hereunder shall
operate as a waiver thereof, nor shall any single or partial exercise of any
such remedy, power, right or privilege preclude other or further exercise
thereof or any other remedy, right, power or privilege.  All rights and
remedies existing under this Lease are cumulative to, and not exclusive of, any
rights or remedies otherwise available.

         23.     SURVIVAL OF WARRANTIES.  All agreements, representations and
warranties of the Lessee and the Lessor made herein shall survive the execution
of this Lease.

         24.     APPLICABLE LAW AND ARBITRATION.  (a)  This Lease and all
documents issued or executed pursuant hereto shall be governed by, and
construed under, the internal laws of the State of Texas.  If any provision of
this Lease or any remedy provided herein shall be held to be invalid under any
applicable law, such provision shall be inapplicable and deemed omitted, but
the remaining provisions of this Lease shall be and remain effective in
accordance with their terms.  This Lease may only be amended or modified by an
instrument in writing signed by a duly authorized representative of the party
to be charged thereby.

         (b)     Any controversy or claim arising out of or relating to this
Lease, or the alleged breach thereof, which cannot be resolved between the
Lessor and the Lessee shall be referred to arbitration before the Society of
Marine Arbitrators, Inc. before three (3) persons, one to be appointed by the
Lessor, one by the Lessee and the third by the two so chosen; their decision or
that of any two of them shall be final.  The proceedings shall be conducted in
accordance with the Rules of such Society then in effect; provided, however,
that such arbitration proceedings shall take place in Houston, Texas.  Any
award of the arbitration panel shall be final and binding on both parties and
may be enforced in the U.S. District Court for the Southern District of Texas,
or any other court having jurisdiction over the parties.  The Lessor and the
Lessee agree that neither party shall have any right to commence or maintain
any suit or legal proceeding concerning any dispute hereunder, other than a
suit for enforcement of the arbitration provisions contained in this Section
24(b), until the dispute has been determined in accordance with the arbitration
procedure provided for herein and then only for enforcement of the award
rendered under such arbitration.

         25.     COUNTERPARTS.  This Lease may be executed in any number of
counterparts, each of which shall be deemed an original, but all such
counterparts together shall constitute but one and the same instrument.

         26.     NOTICES.  (a)  All notices, requests, consents, demands and
other communications provided for or permitted hereunder shall be effective
three (3) days after being duly deposited in the mails, certified, return
receipt requested, or upon receipt if delivered to Federal Express or similar
courier company or transmitted by telefax, addressed to the respective party at
the address set forth below:





                                       8
<PAGE>   9
                 Lessor:  Seitel Geophysical, Inc.
                                  50 Briar Hollow Lane, 7th Floor West
                                  Houston, Texas  77027
                                  Fax No. (713) 627-2319

                 Lessee:  Horizon Exploration Limited
                                  6 Pembroke Road
                                  Sevenoaks
                                  Kent TN13 1XR
                                  England
                                  Fax No. 011-441-732-742-977

         (b)     Either of the parties hereto may change its address by notice
in writing given to the other party to this Lease.




                                        SEITEL GEOPHYSICAL, INC.


                                        By:      /s/ JAY N. SILVERMAN
                                           -------------------------------------
                                           Name:  Jay N. Silverman             
                                                  ------------------------------
                                           Title: President            
                                                  ------------------------------


                                        HORIZON EXPLORATION LIMITED
                                        
                                        
                                        By:      /s/ GERRY HARRISON
                                           -------------------------------------
                                           Name:  Gerry Harrison
                                                  ------------------------------
                                           Title: Director       
                                                  ------------------------------
                                        



                                       9

<PAGE>   1

                                                                  EXHIBIT 10.46





                          HORIZON EXPLORATION LTD (1)

                                      AND

                          THE BANK OF N T BUTTERFIELD
                               & SON LIMITED (2)


                                   ASSIGNMENT
<PAGE>   2
THIS ASSIGNMENT is made the                                                1996

BETWEEN:

(1)      HORIZON EXPLORATION LIMITED a company registered in England under
         Company Number 02804983 of 6 Pembroke Road, Sevenoaks, Kent TN13 1XR
         ("the Assignor"); and

(2)      THE BANK OF N T BUTTERFIELD & SON LIMITED (London Branch) of 24
         Chiswell Street, London EC1Y 4TY ("the Bank")

WHEREAS:

         In consideration of the Bank making revolving trade finance facilities
         ("the Facilities") to the Assignor the Assignor has agreed to enter
         into this Deed of Assignment.

1.       DEFINITIONS AND INTERPRETATION

         1.1     In this Assignment including the Recitals hereto the following
                 words and expressions shall unless the context otherwise
                 requires bear the following meanings:

                 "THE CONTRACT PROCEEDS" all sums to be paid by (the Client) to
                 the Assignor from time to time in accordance with the terms of
                 the Agreement;

                 "THE AGREEMENT" means the seismic research survey agreement
                 entered into between the Assignor and (the Client) dated
                 ___________ 1996;

                "(THE CLIENT)" means (the Client) ______________

2.       COVENANT TO PAY

         The Assignor covenants on demand to pay and discharge to the Bank all
         monies obligations and liabilities whether principal interest or
         otherwise which may now or at any time in the future be due, owing or
         incurred by the Assignor to the Bank.

3.       ASSIGNMENT

         3.1     The Assignor as beneficial owner and as a continuing security
                 hereby assigns absolutely to the Bank the Contract Proceeds
                 together with all rights of action and interest associated
                 therewith;

         3.2     The bank agrees that all payments received in respect of the
                 Contract Proceeds under the terms of this Assignment shall be
                 set against all monies due from the Assignor to the Bank from
                 time to time;

         3.3     If the Assignor shall unconditionally and irrevocably pay or
                 discharge to the Bank all monies and the obligations and
                 liabilities covenanted to be paid by the Assignor to the Bank
                 in accordance with Clause 2 hereof, then the Bank will at the
                 request and cost of the Assignor reassign the Contract
                 Proceeds to the Assignor or as the Assignor shall direct.

4.       REPRESENTATIONS, WARRANTIES AND COVENANTS BY THE ASSIGNOR

         The Assignor represents and warrants to the Bank and undertakes that:

         4.1     The Agreement is valid and in force free of any charge or
                 encumbrance of any kind and nothing has been or shall be done,
                 permitted or suffered whereby the Bank may be prevented from
                 receiving all or any of the monies payable to the Assignor in
                 terms thereof;

         4.2     The Assignor shall forthwith give notice of this Assignment to
                 the Bank in the form of the Schedule hereto and deliver the
                 receipted notice to the Bank;





                                       2
<PAGE>   3
         4.3     The Assignor shall duly and punctually perform all the
                 obligations on the part of the Assignor under the Agreement
                 and to procure so far as possible the due performance of all
                 obligations of (the Client) under the Agreement;

         4.4     The Assignor shall take all action promptly and expeditiously
                 (at its own expense in all respects) required to ensure the
                 proper payment of the Contract Proceeds and to ensure that the
                 Contract Proceeds are paid direct to such account as the Bank
                 shall from time to time direct.

         4.5     The Assignor shall not do or cause to or permit to be done
                 anything which may depreciate, jeopardize or otherwise
                 prejudice the value of the Contract Proceeds assigned
                 hereunder.

         4.6     The Assignor shall not make any other assignment or transfer
                 or agree to make any such transfer in respect of the Contract
                 Proceeds and shall not permit or allow any rights to arise in
                 favor of or exercisable by any third parties (other than the
                 Bank) over the Contract Proceeds.

         4.7     If the Assignor shall fail to satisfy the Bank that it has
                 performed any of its obligations under this Clause 4 then the
                 Bank may take such steps as it considers appropriate to
                 procure the performance of such obligation and shall not
                 thereby be deemed to be a mortgagee in possession and the
                 monies expended by the Bank shall be reimbursed by the
                 Assignor on demand and until so reimbursed shall carry
                 interest at 4% above the Bank's base rate from time to time.

5.       PERFORMANCE OF OBLIGATIONS UNDER THE AGREEMENT

         For the avoidance of doubt the Assignor will remain liable and
         responsible to perform all its obligations under the Agreement and any
         variations thereto.

6.       FURTHER ASSURANCE

         The Assignor shall, whenever requested by the Bank, immediately
         execute and sign all such deeds and documents and do all such things
         as the Bank may require at the Assignor's cost over the Agreement for
         the purpose of perfecting or more effectively providing security to
         the Bank for the payment and discharge of the monies, obligations and
         liabilities secured by this Agreement.

7.       COSTS

         All costs, charges and expenses incurred by the Bank in relation to
         this Assignment or the monies, obligations and liabilities hereby
         secured shall be reimbursed by the Assignor to the Bank on demand on a
         full indemnity basis and until so reimbursed shall carry interest as
         mentioned in Clause 4 from the date of payment to the date of
         reimbursement.

8.       MISCELLANEOUS

         8.1     The security constituted by this Assignment shall be in
                 addition to and shall not be prejudiced, determined or
                 affected nor operate so as in anyway to determine prejudice or
                 affect any other security which the Bank may now or at any
                 time in the future hold for or in respect of all or any part
                 of the monies, obligations and liabilities secured by this
                 Assignment nor shall any prior security held by the Bank over
                 the Agreement merge in the security constituted by this
                 Assignment which shall remain in force and effect
                 notwithstanding any intermediate settlement of account as a
                 continuing security until discharged by the Bank.

         8.2     The Bank may, without discharging or in anyway affecting the
                 security created by this Assignment or any remedy of the Bank
                 grant time or other indulgence or abstain from exercising or
                 enforcing any remedies, securities, guarantees or other rights
                 which it may now or in the future have from or against the
                 Assignor and may make any other arrangement, variation or
                 release with any person or persons without prejudice either to
                 this Assignment or liability of the Assignor for the monies,
                 obligations and liabilities secured by this Assignment.

         8.3     The Bank shall have a full and unfettered right to assign the
                 whole or any part of the benefit of this Assignment and the
                 expression "the Bank" shall include its successors and assigns
                 and the Bank shall be





                                       3
<PAGE>   4
                 entitled to disclose any information to any actual or
                 prospective assignee, successor or participant.

         8.4     The provisions of this Assignment shall be severable and if at
                 any time any one or more such provisions is or becomes
                 invalid, illegal or unenforceable, the validity, legality and
                 enforceability of the remaining provisions shall not in anyway
                 be impaired.

         8.5     The rights and remedies of the Bank provided by this
                 Assignment are cumulative and are not exclusive of any rights,
                 powers or remedies provided by law and may be exercised from
                 time to time and as often as the Bank may deem expedient.

         8.6     Any reference in this Assignment to any statute or any section
                 of any statute shall be deemed to include reference to any
                 statutory modification or re-enactment thereof for the time
                 being in force.

9.       NOTICES

         Any demand or notice under this Assignment may be served personally or
         may be sent by post to the Assignor's last known address or place of
         business.  If such demand or notice is sent by post it shall be deemed
         to have been received on the day following the day on which it was
         posted and shall be effective notwithstanding that it was not in fact
         delivered or was returned undelivered.

10.      GOVERNING LAW AND JURISDICTION

         This Assignment shall be governed and construed in accordance with the
         laws of England and the Assignor hereby irrevocably submits to the
         non-exclusive jurisdiction of the English Courts.

         IN WITNESS whereof the Assignor has executed and delivered this
Assignment as a deed the day and year first above written.





                                       4
<PAGE>   5
         EXECUTED but not delivered until            )
                                               
         the date hereof) as a Deed by               )
                                               
         HORIZON EXPLORATION LIMITED                 )
                                               
         acting by:                                  )
                                               
                                                       Director
                                               
                                               
                                               
                                                       Director/Secretary
                                               
                                               
                                               
         EXECUTED but not delivered until            )
                                               
         the date hereof) as a Deed by               )
                                               
         THE BANK OF N. T. BUTTERFIELD & SON         )
                                               
         LIMITED (London Branch) acting by:          )
                                               
                                                       Authorized Officer
                                               
                                               
                                               
                                                       Authorized Officer





                                       5
<PAGE>   6
THE SCHEDULE

NOTICE OF ASSIGNMENT

To:                                                               Date:



Dear Sirs:

NOTICE OF ASSIGNMENT OF CONTRACT PROCEEDS

We hereby give you notice that all sums to be paid or advanced to us by you
under the terms of the Seismic Research Survey Agreement ("the Agreement")
between us have been assigned by us to The Bank of N T Butterfield & Son
Limited of 24 Chiswell Street, London EC1Y 4TY ("the Bank") to secure all
monies obligations and liabilities due, owing or incurred to the Bank.

Further, we irrevocably authorize and require you to make all future payments
in respect of the Contract Proceeds to the Bank, quoting the following
reference:

         Remit to:        Bank of Butterfield
                          Sort Code:               40-51-91
                          Account Name:            Horizon Exploration Ltd.
                          Account Number:

This authority is to take immediate effect.

Please acknowledge by signing and returning one copy of this notice.

Yours faithfully,



HORIZON EXPLORATION LIMITED

We acknowledge receipt of a copy of the above notice.


- ---------------------------------
for and on behalf of

                                        Date:                     1994





                                       6

<PAGE>   1
                                                                   EXHIBIT 10.47



DATED   30th August                                                         1994
- --------------------------------------------------------------------------------




                            HORIZON EXPLORATION LTD.





                                     -AND-




                      THE BANK OF N. BUTTERFIELD & SON LTD





                       LETTER OF HYPOTHECATION AND PLEDGE





- --------------------------------------------------------------------------------
<PAGE>   2
                       LETTER OF HYPOTHECATION AND PLEDGE


TO:              THE BANK OF N.T. BUTTERFIELD & SON LTD
                 24 CHISWELL STREET
                 LONDON ECY 4TY


1.               CONSIDERATION

                 In consideration of you making/continuing advances to us or
                 incurring liability on our behalf by way of acceptance or
                 discount bills of exchange or in respect of documentary
                 creditors or collection or otherwise in any way whatsoever or
                 otherwise making credit/banking facilities available to us, we
                 agree with you as follows to the intent that the provisions
                 set out below shall apply on a continuing basis to all such
                 transactions.

2.               REPRESENTATIONS AND WARRANTY

                 We represent and warrant to you that we have a good right to
                 pledge with you the Goods and to execute or sign any transfers
                 delivery orders or other requisite documents and the Documents
                 (as herein defined) are valid and that we have good title to
                 them and that the Goods are within our own disposition and
                 control free from any other hypothecation, pledge, charge or
                 encumbrance of any kind.

3.               TERMS OF AGREEMENT

                 It is understood and agreed that the terms upon which the
                 above credit/banking facilities will be made/given are as
                 follows:

3.1              All bills of exchange, promissory notes and negotiable
                 instruments of any description, all bills of lading, shipping
                 documents, dock warrants, delivery orders wharfingers and
                 other warehouse warrants and receipts, policies and
                 certificates of insurance, invoices and all other documents of
                 title or documents relating to produce and goods (the
                 "Documents") and all produce and goods represented by such
                 documents or to which such documents relate (the "Goods")
                 which shall be negotiated with you or handed to you for
                 collection or otherwise or against which you may from time to
                 time make available banking facilities or accommodation with
                 or without collateral security, are hereby held; and

                 All Documents and/or Goods which are now or may at any time
                 after the date of this letter be in your possession or
                 deposited with you or your agents or representatives or lodged
                 with you or transferred to you or your nominees by us





                                       2
<PAGE>   3
                 or by others in our name or for our account (whether deposited
                 for safe custody, collection, security or for any specific
                 purpose or generally and whether in England or elsewhere), are
                 hereby pledged and

                 As a continuing security for the payment or discharge or
                 demand of all moneys obligations and liabilities whether
                 actual or contingent now or hereafter due or to become due
                 owing or incurred to you by us in whatever currency
                 denominated whether on any current or other account or
                 otherwise in any manner whatsoever (whether alone or jointly
                 and in whatever style name or form and whether as principal or
                 surety) including all liabilities in connection with foreign
                 exchange transactions, accepting or endorsing or discounting
                 any notes or bills or under bonds guarantees indemnities
                 documentary or other credits or any instruments whatsoever
                 from time to time entered into by you or at the request of us
                 together with interest to date of payment at such rates and
                 upon such terms as may from time to time be agreed and all
                 commissions fees and other charges and all legal and other
                 costs and expenses incurred by you (including those of your
                 nominees and agents) in relation to us or the goods and a full
                 indemnity basis.

3.2              Negative Covenants.  We will not [and will procure that none
                 of our subsidiaries for the time being will] without your
                 prior written consent.

3.2.1            give any guarantees or indemnities otherwise than to you or
                 any of your subsidiaries or in the ordinary course of trading
                 (which expression shall not include guarantees or indemnities
                 in respect of monies borrowed, credit incurred or financial
                 obligations assumed by any third party);

3.2.2            part with, convey, lease or otherwise dispose of or enter into
                 any agreement for parting with conveying or leasing or
                 otherwise disposing of any of the freehold or leasehold
                 properties now or hereafter belonging to us or our
                 subsidiaries at below the then current market value;

3.2.3            create or permit to subsist any mortgage, debenture,
                 hypothecation, charge, assignment by way of security, pledge
                 or lien or any other encumbrance or security whatsoever (other
                 than any such disclosed to you in writing prior to the date
                 hereof) over all or any part of our or their respective
                 present or future undertakings, properties, assets, revenues
                 or uncalled capital except liens arising solely by operation
                 of law in the ordinary course of trading which are discharged
                 within sixty days of arising (unless being contested in good
                 faith and by appropriate proceedings);

3.2.4            permit to increase the amount secured by any mortgage,
                 debenture, hypothecation, charge, assignment by way of
                 security, pledge or lien or any other encumbrance or security
                 existing at the date hereof over all or any part of our or





                                       3
<PAGE>   4
                 their respective present or future undertakings, properties,
                 assets, revenues or uncalled capital except as aforesaid.

4.               UNDERTAKINGS

4.1              We hereby undertake to provide you with funds;

4.1.1            to meet on demand all bills negotiated, endorsed or advanced
                 against or purchased by you for us which may be dishonored on
                 presentation for acceptance or which may not be paid at the
                 due date thereof according to the original tenor and all
                 liability in respect thereof however arising and non-payment
                 of a bill shall be deemed to have taken place if at that date
                 funds have not been placed at your free disposal for the whole
                 sum due;

4.1.2            to reimburse you for all advances made against documents of
                 title which may not have been duly taken up on presentation;

4.1.3            to meet re-exchange expenses and all interest commission,
                 discount and other bankers charges, legal, notarial and other
                 costs, disbursements and expenses on a full indemnity basis;

4.1.4            to meet all freight, warehouse, dock, transit and other
                 charges the cost of insurance, rent and all other costs of and
                 incidental to such goods.

4.2              We hereby undertake to indemnify you and your correspondents
                 and agents on demand against all losses claims expenses
                 demands and liabilities of whatever nature now or hereafter
                 incurred by (or by any agent officer or employee of) you or
                 any of them for anything done or omitted in the exercise or
                 purported exercise of the powers herein contained or
                 occasioned by any breach by any of us our obligations
                 hereunder.

5.               BANK'S AUTHORITIES

                 If, after due inquiry with us, you are not satisfied at the
                 responses provided, you are authorised at your absolute
                 discretion without further notice to us or further consent of
                 any person interested;

5.1              to insure all the Goods against all insurance risks whether by
                 land, sea or air for their full value and to recover the full
                 amount from the insurers;

5.2              to land and store or arrange for the storage of the goods
                 and/or re-ship the same to any other port;





                                       4
<PAGE>   5
5.3              to pay all freight, warehouse, dock, transit and other
                 charges, the cost of insurance, rent and all other costs of
                 and incidental to the Goods as you may from time to time think
                 fit;

5.4              to pay or retain and charge us with such charges for
                 commission as are usual between merchant and correspondent and
                 such interest re-exchange notarial and banking charges as are
                 usually payable in these circumstances;

5.5              to take conditional acceptance of bills of exchange (including
                 acceptances for honor) and/or to extend the due date for
                 payment thereof upon such conditions as you think fit;

5.6              to accept payment from drawees or acceptors (whether or not
                 the acceptance is conditional) before maturity under rebate or
                 discount on payment to deliver up the relative Documents to or
                 to the order of the drawees or acceptors;

5.7              to accept part payment before maturity and to deliver such
                 proportionate part of the goods held against the same as you
                 in your absolute discretion think fit;

5.8              to convert into Sterling by telegraphic reminance or otherwise
                 at your discretion any monies received by you under or by
                 virtue of this letter of hypothecation and to debit our
                 account with all costs, charges and loss on exchange thereby
                 incurred;

5.9              to debit our account with all payments of freight, warehouse,
                 dock, transit and other charges the cost of insurance, rent,
                 interest and all other expenses incurred hereunder and with
                 all money chargeable to us under this letter of hypothecation
                 and pledge and with the amount of unaccepted or unpaid bills
                 of exchange or of advances against other documents of title
                 for which we are liable to you or any deficiency arising after
                 realization;

                 but so that you are under no obligation to do any of the
                 foregoing and are not liable for any loss we may sustain as a
                 result of your delay or failure so to do.

6.               DISPOSAL OF SECURITY

6.1              You are authorised without demand for payment or notice or
                 further consent of any person to sell or otherwise dispose of
                 all or any of the goods at such times or times in such manner
                 and for such consideration (whether payable or deliverable
                 immediately or by installments) as you may in your absolute
                 discretion think fit without being under any responsibility to
                 us for the price obtained thereby in any of the following
                 events.





                                       5
<PAGE>   6
6.1.1            on default of acceptance on presentation or in payment at
                 maturity of any bill of exchange or of any of the sums due
                 hereunder;

6.1.2            on any drawee or acceptor of any bill (whether conditionally
                 or absolutely accepted) suspending payment, becoming bankrupt
                 or insolvent or taking any steps composition or arrangement
                 with creditors;

6.1.3            on our failure to repay on demand any money obligation or
                 liability due, owing or incurred to you by us with all
                 interest, commission, discount and other bankers charges,
                 legal and other costs, disbursements and expenses due or
                 incurred in respect thereof;

6.1.4            on any payment being made by you which you are authorised to
                 make hereunder;

6.1.5            if and whenever you consider it desirable (having regard to
                 the then market value of the Goods) that the Goods should be
                 sold whether or not any contingent or other liability of ours
                 shall have actually matured to you:

                 but so that you are under no obligation so to sell or
                 otherwise dispose and you are not liable for any loss we may
                 sustain as a result of your delay of failure so to do:

6.2              We will from time to time execute and sign all transfers,
                 delivery order and other documents which you may require for
                 perfecting your title or for vesting or enabling you to vest
                 any of the Goods in you or for facilitating delivery of the
                 same to you or your nominee(s) or transferee(s) or to effect
                 delivery of the same as you may require and to do all such
                 acts and things as may from time to time be necessary or
                 expedient for effecting any sale or other disposition you may
                 make.  You and your agent(s) and nominee(s) are hereby
                 severally and irrevocably authorised to execute and deliver
                 any such document as our agent and to do any such act or thing
                 on our behalf;

6.3              After deduction of all expenses, charges and commissions the
                 net proceeds of such sale or disposal of the Goods shall be
                 applied at your absolute discretion in discharge or reduction
                 of any actual or contingent debt, obligation or liability to
                 you of us and any surplus shall (subject to the provisions of
                 this letter of hypothecation and pledge) be at our disposal.
                 If such proceeds are insufficient for such purpose we
                 undertake to make good such deficiency.  Section 93 and the
                 provisions contained in S.  103 of the Law of Property Act
                 1925 shall not apply.  Any statement of account rendered to us
                 by you shall be sufficient proof of the sale or other disposal
                 of any of the Goods hereunder and of our deficiency resulting
                 therefrom and shall for all purposes be conclusive between us
                 and you.





                                       6
<PAGE>   7
7.               INSURANCE

                 We undertake that the Goods will be kept insured in their full
                 value or for such other value as you may specify against all
                 insurable risks including fire and flood and a note of your
                 interest has been endorsed on the relevant policies and all
                 policies whether effected by you or not are to be treated as
                 part of your security.  Should any claim arise under any
                 insurance you are hereby irrevocably authorised to recover the
                 full amount thereof from the insurers and to give a valid
                 receipt on our behalf to charge the same commission on the
                 proceeds as on a sale of the produce of goods and to apply
                 such proceeds as if the same represented proceeds of any sale
                 or disposal of any such goods hereunder.  We hereby undertake
                 to assign to you the policies of insurance for that purpose
                 and to deliver them to you on demand and in the case of loss
                 or damage to such goods howsoever caused to pay over to you
                 all sums received by us in respect of such insurance and make
                 up any deficiency which may result in the amount of any monies
                 due to you and pending payment we shall hold all such sums in
                 trust for you.

8.               MAINTENANCE OF SECURITY

                 We undertake to maintain such margin of security over
                 liabilities as you shall from time to time stipulate, either
                 by payment to you of cash or, if so agreed by you, by the
                 deposit of additional collateral approved by you.

9.               ADDITIONAL GUARANTEES

                 Your holding additional guarantees or securities is not to
                 prejudice your rights on any bills of exchange in case of
                 dishonor nor shall any recourse or proceedings taken thereon
                 or your giving time or granting any indulgence or making any
                 arrangement of composition affecting your title to any
                 security or our liability.

10.              RESTRICTION OF LIABILITY

                 We hereby irrevocably acknowledge that you are not to be
                 liable to account as mortgage in possession or otherwise in
                 any circumstances for;

10.1             any default by any insurer, warehouse keeper, broker,
                 auctioneer, agent, carrier, captain or other officer of any
                 ship or craft or other person employed in the insurance, sale,
                 disposal, storage, shipment or carriage of any of the Goods or
                 for any other purpose connected therewith nor;

10.2             any deterioration or deficiency in the quantity, quality,
                 condition, delivery insurance or value of any of the Goods
                 nor;





                                       7
<PAGE>   8
10.3             the stoppage or detention thereof by the shipper or any other
                 person whomsoever nor;


10.4             the correctness, validity, sufficiency or genuineness of any
                 of the Documents relating to the Goods from time to time
                 deposited with you or your agents representatives or for any
                 delay or omission which may occur in connection with the
                 acceptance or payment of any drafts drawn on the buyers of any
                 of the Goods nor;

10.5             loss on exchange rates or any other loss, damage or delay
                 howsoever caused relating directly or indirectly to any of the
                 Goods or the sale or disposal thereof.

11.              RIGHT OF SET-OFF

11.1             If any bill of exchange hypothecated to you by us is not paid
                 in full at maturity then all advances made by you and all
                 credits given by you to us against any other bill at any time
                 drawn upon or accepted by the same drawee or acceptor and all
                 other such sums shall forthwith become due and repayable to
                 you without further demand and you shall be entitled without
                 notice to set-off all or any of such advances credits or other
                 such sums against any monies standing to our credit alone or
                 jointly with others on any current or other account and shall
                 have a lien on and be entitled to retain as security for the
                 foregoing all or any cheques, drafts, bills, notes and
                 negotiable instruments of us.

11.2             All monies received by you from us or from any other person
                 may be applied to such account or liability of us or any one
                 or more of us as you in your absolute discretion may from time
                 to time conclusively determine.

12.              OFFICER'S AUTHORITY ETC

                 All the powers and authorities hereby given to you are powers
                 and authorities equally given to or in favour of any Director,
                 Manager of Offices of your Bank and your Correspondents or
                 other Agents and the holders for the time being of any bill as
                 if such persons were in each case specifically named and such
                 powers and authorities may be exercised accordingly.

13.              NOTICES

                 Any notice or copy of protest for non-acceptance or non-payment
                 or any other communication having reference to any transaction
                 under this letter of hypothecation and pledge shall without
                 prejudice to any other effective mode of making the same be
                 deemed to have been sufficiently made on us if served on any
                 one of the Directors or on the Secretary personally or if left
                 for or sent by post to our registered office and shall be
                 assumed to have reached the addressee within 24 hours of
                 posting and in proving such service it shall be sufficient to
                 prove that the notice or communication was properly addressed,
                 stamped and posted by first class post.

14.              INTERPRETATION

14.1             Reference to you in this letter of hypothecation and pledge
                 shall, where the context admits, include your successors and
                 assigns whether immediate or derivative and if this letter is
                 signed by two or more persons all agreements, obligations,
                 warranties, powers, authorities, liabilities and charges herein
                 contained or implied on their part are joint and several and
                 shall be entitled to any of the rights or remedies legal or
                 equitable of a surety as regards the indebtedness obligations
                 or liabilities of any others of the undersigned:

14.2             You shall be at liberty to release compound with or otherwise
                 vary or agree to vary the liability of or to grant time or
                 indulgence to or make other arrangements with or any other
                 person without prejudicing or affecting your rights and 
                 remedies against any others of the undersigned.

15.              CONTINUING SECURITY ETC.

   
                 The security created by this letter of hypothecation and pledge
                 shall apply to all current and future transactions
                 (nothwithstanding that any current transaction may have been
                 entered into prior to the date hereof) and shall remain in
                 force notwithstanding the liquidation, incapacity or any change
                 in our constitution or any intermediate settlement of account
                 or other matter whatsoever until the expiration of one month
                 after receipt by you of notice to determine the same PROVIDED
                 ALWAYS that such notice shall not have effect to terminate the
                 security created by this letter of hypothecation in respect of
                 amounts owing to you as at the date of receipt of such notice
                 or in respect of obligations or liabilities present or future,
                 actual or contingent occurred by us with you or arising out of
                 any transaction effected prior to receipt of such notice and is
                 in addition to and shall not merge with or otherwise prejudice
                 or effect any guarantee, lien, bill, note, mortgage or other
                 security right or remedy now or hereafter held by or available
                 to you and neither this letter of hypothecation and pledge to
                 your lien as bankers nor your rights or remedies on any bill or
                 otherwise shall be in any way prejudiced or affected thereby or
                 by the invalidity thereof by you now or hereafter dealing with
                 exchanging, releasing, modifying or abstaining from perfecting
                 or enforcing any of the same or any rights or remedies which
                 you may now or hereafter have no giving time for performance or
                 indulgence or compounding with any other person liable.
    

16.              CURRENCY

16.1             Moneys received or held by you pursuant to this pledge and
                 hypothecation may from time to time after demand has been made
                 be converted into such currency as you consider necessary or
                 desirable to cover the obligations and liabilities actual or
                 contingent of us that currency at your then prevailing spot
                 rate of exchange (as conclusively determined by you) for
                 purchasing the currency to be acquired with the existing
                 currency.

16.2             If and to the extent that we fail to pay the amount when due
                 on demand, you may in your absolute discretion without notice
                 to us purchase at any time thereafter so much of a currency as
                 you consider necessary or desirable to cover obligations and
                 liabilities actual or contingent in such currency hereby
                 secured at your then prevailing spot rate of exchange (as
                 conclusively determined by you) for purchasing such currency
                 with sterling and we hereby agree to indemnify you against the
                 full sterling cost incurred by you for such purchase.

16.3             No payment to you (whether under any judgment or court order
                 or otherwise) shall discharge the obligation or liability in
                 respect of which it was made unless and until you shall have
                 received payment in full in the currency in which such
                 obligation was incurred as to the extent the amount of any
                 such payment shall on actual conversion into such currency
                 fall short of such obligation or liability expressed in that
                 currency you shall have a further separate cause of action





                                       8
<PAGE>   9
                 against and shall be entitled to enforce this pledge and
                 hypothecation to recover the amount of the shortfall.

17.              GOVERNING LAW AND JURISDICTION

                 This letter of hypothecation and pledge shall be governed and
                 interpreted in accordance with English law and we irrevocably
                 submit to the non-exclusive jurisdiction of the High Court of
                 Justice in England and/or Wales but it shall be open to you to
                 enforce this letter of hypothecation and pledge in the courts
                 of any other competent jurisdiction.


                 Dated    30th August 1994

                 SIGNED by                 /s/ G.M. Harrison


                 for and on behalf of HORIZON EXPLORATION LTD
                 in the presence of


                 Signature:George Purdie                                     

                 Address:
                         ----------------------------------------------
                 
                 ------------------------------------------------------
     
                 ------------------------------------------------------ 

                 Occupation:  Director





                                       9

<PAGE>   1
                                                                       EX. 10.48


REF: 627-96
CLIENT: HORIZON
DATE: 7TH JAN 97


                                LEASE AGREEMENT


      This AGREEMENT is made this 7th day of January 1997 between DigiCOURSE
INC., a corporation organized and existing under the laws of the State of
Louisiana, United States of America, with its principal place of business at
5200 Toler Street, Harahan, Louisiana, U.S.A. (hereinafter "DigiCOURSE") and
Horizon Exploration Limited ("LESSEE") with its principal place of business at
6 Pembroke Road, Sevenoaks, Kent TN13 1XR.

       This AGREEMENT replaces the previous lease agreement dated 21st October
1996 in respect of a daily lease of $1130.60.

IN CONSIDERATION OF the mutual covenants and undertakings herein, the parties 
agree as follows:

1.       LEASE EQUIPMENT

     1.1   DigiCOURSE hereby leases to LESSEE the following equipment
             (hereinafter "Equipment"), under the terms and conditions set
             forth below:


<TABLE>
<CAPTION>
============================================================================================================
LEASE EQUIPMENT - DATED 21ST OCTOBER 1996 - PACIFIC HORIZON
- ------------------------------------------------------------------------------------------------------------
   QTY      SPARES            DESCRIPTION              PART NO.       UNIT PRICE          DAILY   TOTAL
                                                                                          LEASE   DAILY
                                                                                                  LEASE
  <S>       <C>       <C>                         <C>                <C>                 <C>      <C> 
- ------------------------------------------------------------------------------------------------------------
    25                Streamer Mount CMX           9000-4012/11       $ 8,825.00        $28.00    $  700.00
- ------------------------------------------------------------------------------------------------------------
    12                Model 5011 Compass bird      9000-5011          $ 9,900.00        $28.00    $  336.00
- ------------------------------------------------------------------------------------------------------------
    1                 Sys.3 S/W Upgrade            9000-508/06-210    $35,000.00        $95.60    $   95.60
- ------------------------------------------------------------------------------------------------------------
                                                                                     DAILY LEASE  $1,131.60
- ------------------------------------------------------------------------------------------------------------
LEASE EQUIPMENT - EFFECTIVE 1ST JANUARY 1997 - PACIFIC HORIZON
- ------------------------------------------------------------------------------------------------------------
    1         1       System 3 Line Power Unit     9000-503/01        $ 2,500.00        $ 8.00    $   16.00
- ------------------------------------------------------------------------------------------------------------
    6         4       CTX Pinger Flanged           9000-4112/01       $ 4,430.00        $15.00    $  150.00
- ------------------------------------------------------------------------------------------------------------
    5         3       CTX Electronics Module -     9000-4022/11       $ 4,595.00        $14.00    $  112.00
                      FSK
- ------------------------------------------------------------------------------------------------------------
                                                                                     DAILY LEASE  $  278.00
- ------------------------------------------------------------------------------------------------------------
</TABLE>
<PAGE>   2
<TABLE>
  <S>       <C>       <C>                         <C>                <C>                 <C>       <C>
- --------------------------------------------------------------------------------------------------------------
LEASE EQUIPMENT - EFFECTIVE 1ST JANUARY 1997 - SIMON LABRADOR
- --------------------------------------------------------------------------------------------------------------
    1         1       System 3 Line Power Unit     9000-503/01        $2,500.00          $ 8.00    $   16.00
- --------------------------------------------------------------------------------------------------------------
    6         8       CTX Pinger Flanged           9000-4112/01       $4,430.00          $15.00    $  210.00
- --------------------------------------------------------------------------------------------------------------
    5         7       CTX Electronics Module -     9000-4022/11       $4,595.00          $14.00    $  168.00
                      FSK
- --------------------------------------------------------------------------------------------------------------
    1                 Model 5011 Compass bird      9000-5011          $9,900.00          $28.00    $   28.00
- --------------------------------------------------------------------------------------------------------------
                                                                                    DAILY LEASE    $  422.00
- --------------------------------------------------------------------------------------------------------------
LEASE EQUIPMENT - EFFECTIVE 1ST JANUARY 1997 - DISCOVERER
- --------------------------------------------------------------------------------------------------------------
    4                 Streamer Mount CMX           9000-4012/11       $8,825.00          $28.00    $  112.00
- --------------------------------------------------------------------------------------------------------------
                                                                                    DAILY LEASE    $  112.00
- --------------------------------------------------------------------------------------------------------------
                                                                              TOTAL DAILY LEASE    $1,943.60
==============================================================================================================
</TABLE>




2.       LEASE PAYMENTS

         2.1     LESSEE shall pay to DigiCOURSE for lease of the Equipment the
                 sum of $1,943.60 per day for a minimum of 60 days.  Lease
                 payments shall be made monthly and shall be due and payable
                 within thirty days (30) days of receipt of LESSEE of LESSOR'S
                 statement.  Lease shall begin to accrue upon delivery of
                 Equipment of LESSEE at DigiCOURSE's facility in Harahan,
                 Louisiana.

         2.2     Freight or shipping charges incurred in delivery and/or
                 redelivery of Equipment, at cost plus 12% handling charge,
                 shall be paid by LESSEE.

         2.3     Payments made pursuant hereto shall be calculated and made
                 based upon United States dollars.  Sales computed in other
                 currencies shall be converted into United States dollars at
                 the exchange rate for bank transfers from such currency to
                 United States dollars as quoted by the head office of
                 Citybank, N.A. on the date said payments become due.

3.       TERM AND TERMINATION:

         3.1     If LESSEE is in default on any payments due to DigiCOURSE for
                 a period of thirty (30) days after written notice thereof; or
                 defaults in performing any other term or condition of this
                 Agreement and remains in default for a period of thirty (30)
                 days after notice, or is adjudicated a bankrupt, or goes into
                 liquidation or receivership, or if a majority of LESSEE's
                 equitable ownership is transferred, DigiCOURSE shall have the
                 right to terminate this Agreement upon written notice to
                 LESSEE.
<PAGE>   3
         3.3     Termination of this Agreement for any reason shall not, unless
                 otherwise provided, affect (a) obligations accruing prior to
                 the effective date of termination, or (b) any obligations
                 which, from the context hereof, are intended to survive
                 termination.

4.       PERFORMANCE BY DigiCOURSE

         4.1     DigiCOURSE shall deliver the Equipment leased to LESSEE in
                 good condition, and free from any repairs or defects.

         4.2     DigiCOURSE shall cause LESSEE to be in peaceable possession
                 and enjoyment of the Equipment during the continuance of the
                 lease.

         4.3     DigiCOURSE shall use its best faith efforts to make available
                 to LESSEE, on as timely a basis as possible, parts required to
                 effect necessary repairs on the leased Equipment during the
                 term of the lease.

         4.4     DigiCOURSE agrees to preserve in strict confidence and not
                 disclose to third parties any information of a proprietary
                 nature received from LESSEE and designated as confidential.

5.       PERFORMANCE BY LESSEE.


         5.1     LESSEE shall make itself familiar with, and shall at all times
                 abide by, all literature or communications supplied by
                 DigiCOURSE and pertaining to the assembly, installation, use,
                 and/or safety aspects of the leased Equipment.

         5.2     Upon termination of this Agreement for any reason, LESSEE
                 shall discontinue use of the Equipment and return same to
                 DigiCOURSE at DigiCOURSE 's facility in Harahan, Louisiana, in
                 good condition and running order, ordinary wear and tear
                 excepted.

         5.3     Title to the Equipment shall at all times remain in
                 DigiCOURSE, and LESSEE has no right to, and agrees not to
                 attempt to, encumber or alienate same.

         5.4     LESSEE agrees to prepare and submit to DigiCOURSE, prior to
                 the last day of every month during the term of this Lease, a
                 complete written list of all leases Equipment (including
                 serial numbers) in LESSEE'S possession.

         5.5     LESSEE agrees to preserve in strict confidence and not
                 disclose to third parties any information of a proprietary
                 nature received from DigiCOURSE and designated as
                 confidential.


<PAGE>   4
6.       LOSS/DAMAGE/REPAIR OF EQUIPMENT

         6.1     DigiCOURSE agrees to preform all normal and necessary repairs
                 arising out of the ordinary and intended use of the equipment.
                 DigiCOURSE also agrees to assume the warranty set forth in
                 section 8 below, with respect to any inherent defects of the
                 Equipment.

         6.2     LESSEE shall at its own expense make any repairs as may be
                 required due to its negligent use or misuse of the Equipment,
                 and shall permit DigiCOURSE to inspect the Equipment at
                 reasonable times to ascertain the condition and operation
                 thereof.

         6.3     Only parts supplied by DigiCOURSE shall be used to repair the
                 Equipment. If LESSEE is responsible for such repairs,
                 DigiCOURSE will provide the necessary parts for LESSEE'S
                 account at DigiCOURSES'S list price.  In the event that
                 DigiCOURSE is unable to provide LESSEE with repair parts
                 within a reasonable time, DigiCOURSE shall use its best faith
                 efforts to locate the necessary parts elsewhere and shall
                 either secure such parts itself or authorize LESSEE to do so.

7.       INDEMNITY BY DIGICOURSE

         7.1     DigiCOURSE shall indemnify and hold LESSEE harmless from any
                 and all costs or damages resulting from any patent
                 infringement suit brought against LESSEE as a result of
                 LESSEE'S use of the Equipment.

         7.2     LESSEE agrees to notify DigiCOURSE promptly of any charge of
                 infringement made, or any such action commenced in reference
                 thereto, an to forward to DigiCOURSE copies of all
                 correspondence received by LESSEE, or papers served upon
                 LESSEE, in connection with such charge of infringement.

                 LESSEE agrees that DigiCOURSE shall have the option of
                 defending any such action with counsel of DigiCOURSE'S own
                 choosing or of paying for LESSEE'S counsel, and LESSEE further
                 agrees to cooperate with DigiCOURSE in defending any such
                 action.

8.       WARRANTY

         8.1     DigiCOURSE warrants to LESSEE that the Equipment leased
                 hereunder is free from defects in workmanship or materials for
                 one year from date of lease.

         8.2     In the event of a defect, malfunction or other failure of the
                 Equipment not caused by misuse or damage to the Equipment
                 while in the possession of LESSEE, DigiCOURSE will repair or
                 replace said Equipment or DigiCOURSE's sole option.
<PAGE>   5
         8.3     This warranty is in lieu of all other warranties, express or
                 implied, including any implied warranty of merchantability or
                 fitness for a particular purpose.  Under no circumstances
                 shall DigiCOURSE be liable to LESSEE or any other person for
                 any special damages, including incidental or consequential
                 damages, whether arising out of breach of warranty, breach of
                 contract or otherwise.

9.       PURCHASE OPTION

         9.1     DigiCOURSE grants LESSEE the option to purchase the Equipment
                 as of the last day of any calendar month during the term of
                 this lease.  Up to 100% of the listed sales price of the
                 Equipment will be discounted by eighty-five percent (85%) of
                 the total lease rental payments paid by LESSEE as of that
                 date.

10.      ASSIGNABILITY AND AMENDMENT

         10.1    If LESSEE attempts to assign this Agreement or subject to the
                 Equipment to anyone other than LESSEE'S affiliate company
                 without DigiCOURSE'S written consent, DigiCOURSE may terminate
                 this Agreement and retake possession of the Equipment.

         10.2    This Agreement may be amended only by written instrument
                 signed by authorized representative of both parties and
                 contains the entire understanding between the parties.

11.      CONSTRUCTION AND APPLICABLE LAW

         This Agreement shall be construed and governed in accordance with the
         laws of the State of Louisiana, U.S.A.

12.      NOTICES

         12.1    Notices and payments shall be addressed:

                 DigiCOURSE, INC.
                 5200 Toler Street
                 Harahan, LA 70123

                 Horizon Exploration Limited
                 6 Pembroke Road,
                 Sevenoaks,
                 Kent
                 TN13 1XR


<PAGE>   6
         IN WITNESS WHEREOF, this Agreement has been executed by authorized
representatives of each party of the day and year first above written.

                                        DigiCOURSE, Inc.                       
                                                                               
                                        By          /s/  [illegible signature] 
                                                 ------------------------------
                                                                               
                                        Date:       7th January 1997           
                                                 ------------------------------
                                                                               
                                        Horizon Exploration Limited:           
                                                                               
                                        By:         /s/ George Purdie          
                                                 ------------------------------
                                                                               
                                        Date:       7th January 1997           
                                                 ------------------------------
                                                                               

<PAGE>   1
Ref: 635-97
Client: Horizon
Date: 27th March 97

                                                                   EXHIBIT 10.49
                                LEASE AGREEMENT


      This AGREEMENT is made this 27th day of March 1997 between DigiCOURSE
INC., a corporation organized and existing under the laws of the State of
Louisiana, United States of America, with its principal place of business at
5200 Toler Street, Harahan, Louisiana, U.S.A. (hereinafter "DigiCOURSE") and
Horizon Exploration Limited ("LESSEE") with its principal place of business at
6 Pembroke Road, Sevenoaks, Kent TN13 1XR.

         IN CONSIDERATION OF the mutual covenants and undertakings herein, the
parties agree as follows:

1.       LEASE EQUIPMENT

         1.1     DigiCOURSE hereby leases to LESSEE the following equipment
                 (hereinafter "Equipment"), under the terms and conditions set
                 forth below:



<TABLE>
<CAPTION>
=========================================================================================================
    QTY         DESCRIPTION               PART NO.          UNIT PRICE         DAILY            TOTAL
                                                                               LEASE         DAILY LEASE
- ---------------------------------------------------------------------------------------------------------
     <S>    <C>                         <C>                 <C>                <C>             <C>
     6      Streamer Mount CMX          9000-4012/22        $8,825.00          $28.00          $168.00
- ---------------------------------------------------------------------------------------------------------
     3      CTX Electronics FSK         9000-4022/11        $4,595.00          $14.00           $42.00
- ---------------------------------------------------------------------------------------------------------
                                                                      TOTAL DAILY LEASE        $210.00
=========================================================================================================
</TABLE>


2.       LEASE PAYMENTS

         2.1     LESSEE shall pay to DigiCOURSE for lease of the Equipment the
                 sum of $210.00 per day for a minimum of 60 days.  Lease
                 payments shall be made monthly and shall be due and payable
                 within thirty days (30) of receipt of LESSEE of LESSOR's
                 statement.  Lease shall begin to accrue upon delivery of
                 Equipment of LESSEE at DigiCOURSE's facility in Harahan,
                 Louisiana.

         2.2     Freight or shipping charges incurred in delivery and/or
                 redelivery of Equipment, at cost plus 12% handling charge,
                 shall be paid by LESSEE.

         2.3     Payments made pursuant hereto shall be calculated and made
                 based upon United States dollars.  Sales computed in other
                 currencies shall be converted into United States dollars at
                 the exchange rate for bank transfers from such currency to
                 United States dollars as quoted by the head office of
                 Citybank, N.A. on the date said payments become due.
<PAGE>   2
Ref: 635-97
Client: Horizon
Date: 27th March 97

3.       TERM AND TERMINATION:

         3.1     If LESSEE is in default on any payments due to DigiCOURSE for
                 a period of thirty (30) days after written notice thereof; or
                 defaults in performing any other term or condition of this
                 Agreement and remains in default for a period of thirty (30)
                 days after notice, or is adjudicated a bankrupt, or goes into
                 liquidation or receivership, or if a majority of LESSEE's
                 equitable ownership is transferred, DigiCOURSE shall have the
                 right to terminate this Agreement upon written notice to
                 LESSEE.

         3.3     Termination of this Agreement for any reason shall not, unless
                 otherwise provided, affect (a) obligations accruing prior to
                 the effective date of termination, or (b) any obligations
                 which, from the context hereof, are intended to survive
                 termination.

4.       PERFORMANCE BY DigiCOURSE

         4.1     DigiCOURSE shall deliver the Equipment leased to LESSEE in
                 good condition, and free from any repairs or defects.

         4.2     DigiCOURSE shall cause LESSEE to be in peaceable possession
                 and enjoyment of the Equipment during the continuance of the
                 lease.

         4.3     DigiCOURSE shall use its best faith efforts to make available
                 to LESSEE, on as timely a basis as possible, parts required to
                 effect necessary repairs on the leased Equipment during the
                 term of the lease.

         4.4     DigiCOURSE agrees to preserve in strict confidence and not
                 disclose to third parties any information of a proprietary
                 nature received from LESSEE and designated as confidential.

5.       PERFORMANCE BY LESSEE.


         5.1     LESSEE shall make itself familiar with, and shall at all times
                 abide by, all literature or communications supplied by
                 DigiCOURSE and pertaining to the assembly, installation, use,
                 and/or safety aspects of the leased Equipment.

         5.2     Upon termination of this Agreement for any reason, LESSEE
                 Shall discontinue use of the Equipment and return same to
                 DigiCOURSE at DigiCOURSE's facility in Harahan, Louisiana, in
                 good condition and running order, ordinary wear and tear
                 excepted.

         5.3     Title to the Equipment shall at all times remain in
                 DigiCOURSE, and LESSEE has no right to, and agrees not to
                 attempt to, encumber or alienate same.

         5.4     LESSEE agrees to prepare and submit to DigiCOURSE, prior to
                 the last day of every month during the term of this Lease, A
                 complete written list of all leases Equipment (including
                 serial numbers) In LESSEE's possession.

         5.5     LESSEE agrees to preserve in strict confidence and not
                 disclose to third parties any information of a proprietary
                 nature received from DigiCOURSE and designated as
                 confidential.
<PAGE>   3
Ref: 635-97
Client: Horizon
Date: 27th March 97

6.       LOSS/DAMAGE/REPAIR OF EQUIPMENT

         6.1     DigiCOURSE agrees to preform all normal and necessary repairs
                 arising out of the ordinary and intended use of the equipment.
                 DigiCOURSE also agrees to assume the warranty set forth in
                 section 8 below, with respect to any inherent defects of the
                 Equipment.

         6.2     LESSEE shall at its own expense make any repairs as may be
                 required due to its negligent use or misuse of the Equipment,
                 and shall permit DigiCOURSE to inspect the Equipment at
                 reasonable times to ascertain the condition and operation
                 thereof.

         6.3     Only parts supplied by DigiCOURSE shall be used to repair the
                 Equipment. If LESSEE is responsible for such repairs,
                 DigiCOURSE will provide the necessary parts for LESSEE's
                 account at DigiCOURSE's list price.  In the event that
                 DigiCOURSE is unable to provide LESSEE with repair parts
                 within a reasonable time, DigiCOURSE shall use its best faith
                 efforts to locate the necessary parts elsewhere and shall
                 either secure such parts itself or authorize LESSEE to do so.

7.       INDEMNITY BY DIGICOURSE

         7.1     DigiCOURSE shall indemnify and hold LESSEE harmless from any
                 and all costs or damages resulting from any patent
                 infringement suit brought against LESSEE as a result of
                 LESSEE's use of the Equipment.

         7.2     LESSEE agrees to notify DigiCOURSE promptly of any charge of
                 infringement made, or any such action commenced in reference
                 thereto, and to forward to DigiCOURSE copies of all
                 correspondence received by LESSEE, or papers served upon
                 LESSEE, in connection with such charge of infringement.

                 LESSEE agrees that DigiCOURSE shall have the option of
                 defending any such action with counsel of DigiCOURSE's own
                 choosing or of paying for LESSEE's counsel, and LESSEE further
                 agrees to cooperate with DigiCOURSE in defending any such
                 action.

8.       WARRANTY

         8.1     DigiCOURSE warrants to LESSEE that the Equipment leased
                 hereunder is free from defects in workmanship or materials for
                 one year from date of lease.

         8.2     In the event of a defect, malfunction or other failure of the
                 Equipment not caused by misuse or damage to the Equipment
                 while in the possession of LESSEE, DigiCOURSE will repair or
                 replace said Equipment or DigiCOURSE's sole option.

         8.3     This warranty is in lieu of all other warranties, express or
                 implied, including any implied warranty of merchantability or
                 fitness for a particular purpose.  Under no circumstances
                 shall DigiCOURSE be liable to LESSEE or any other person for
                 any special damages, including incidental or consequential
                 damages, whether arising out of breach of warranty, breach of
                 contract or otherwise.

9.       PURCHASE OPTION

         9.1     DigiCOURSE grants LESSEE the option to purchase the Equipment
                 as of the last day of
<PAGE>   4
Ref: 635-97
Client: Horizon
Date: 27th March 97

                 any calendar month during the term of this lease.  Up to 100%
                 of the listed sales price of the Equipment will be discounted
                 by eighty-five percent (85%) of the total lease rental payments
                 paid by LESSEE as of that date.

10.      ASSIGNABILITY AND AMENDMENT

         10.1    If LESSEE attempts to assign this Agreement or subject to the
                 Equipment to anyone other than LESSEE's affiliate company
                 without DigiCOURSE's written consent, DigiCOURSE may terminate
                 this Agreement and retake possession of the Equipment.

         10.2    This Agreement may be amended only by written instrument
                 signed by authorized representative of both parties and
                 contains the entire understanding between the parties.

11.      CONSTRUCTION AND APPLICABLE LAW

         This Agreement shall be construed and governed in accordance with the
         laws of the State of Louisiana, U.S.A.

12.      NOTICES

         12.1    Notices and payments shall be addressed:

                 DigiCOURSE, INC.
                 5200 Toler Street
                 Harahan, LA 70123

                 Horizon Exploration Limited
                 6 Pembroke Road,
                 Sevenoaks,
                 Kent
                 TN13 1XR

         IN WITNESS WHEREOF, this Agreement has been executed by authorized
         representatives of each party of the day and year first above written.

                 DigiCOURSE, Inc.

                 By       /s/ [illegible signature]

                 Date:    2nd April 97

                 Horizon Exploration Limited:

                 By:      /s/ George Purdie

                 Date:    10/4/97

<PAGE>   1
                                                                   EXHIBIT 10.51


                  OPERATING LEASE OF MARINE SEISMIC EQUIPMENT


         This lease (the "Lease") dated as of February 3, 1997, is between
EAGLE GEOPHYSICAL, INC., a Delaware corporation (the "Lessor") and HORIZON
EXPLORATION LIMITED, a United Kingdom corporation (the "Lessee").

         WHEREAS, the Lessor is the owner of the marine seismic equipment more
fully described in the purchase orders attached hereto as Exhibit A (the
"Equipment"); and

         WHEREAS, the Lessee is the charterer under a time charter with The
Shanghai Bureau of Marine Geological Survey, dated April 12, 1994 of the
Bahamas flag seismic data recording vessel DISCOVERER, Official No. 711122 (the
"DISCOVERER"); and

         WHEREAS, the Lessee is the charterer under a time charter with
Tidewater Marine, Inc., dated February 9, 1996 of the U.S. flag seismic data
recording vessel ABSHIRE TIDE, Official No. 663944 (the "ABSHIRE TIDE"); and

         WHEREAS, the Lessee is the charterer under a time charter with Morr
Vessel Management Ltd., dated February 4, 1981 of the UK flag seismic data
recording vessel PACIFIC HORIZON, Official No. 6413807 (the "PACIFIC HORIZON");
and

         WHEREAS, the Lessee is the charterer under a time charter with
Simon-Horizon Limited, dated July 15, 1994 of the Bahamas flag seismic data
recording vessel SIMON LABRADOR, Official No. 715224 (the "SIMON LABRADOR," and
collectively with the DISCOVERER, the ABSHIRE TIDE, and the PACIFIC HORIZON,
the "Vessels"); and

         WHEREAS, the Lessee wishes to lease the Equipment from the Lessor in
order to improve the seismic data acquisition capabilities of the Vessels;

         NOW THEREFORE, in consideration of the above recitals and for other
good and valuable consideration, the receipt and sufficiency of which is hereby
acknowledged, the parties agree as follows:

         1.      LEASE.  (a) Subject to the provisions hereof, the Lessor
hereby leases to the Lessee and the Lessee hereby leases from the Lessor the
Equipment for a fixed term of three (3) years beginning on the date hereof.

         (b)     The term of this Lease may be extended for successive periods
of one (1) year each upon written agreement of the parties hereto no later than
thirty (30) days prior to termination.

         2.      RENT.  The Equipment shall be leased at a monthly rental,
payable in U.S. Dollars, equal to Lessor's monthly debt payments relating to
the purchase of the Equipment plus 15%, as notified to Lessee from time to time
by Lessor, for the initial term specified in Section 1(a) above ("Rent").  The
Rent for any extension terms shall be agreed to by the parties hereto.





<PAGE>   2
The Lessee agrees to pay the Lessor, or to its order, Rent beginning on
February 28, 1997 and thereafter on the last day of each successive month
during the term of this Lease.

         3.      DELIVERY AND DISCLAIMER OF WARRANTIES. (a) As of the date
hereof, Lessee confirms that the Equipment is in good and satisfactory
operating condition, and has accepted delivery of the Equipment in such
condition.  The Lessor hereby warrants that as of the date hereof it has good
and marketable title to the Equipment free and clear of claims by any third
party (other than the security interest granted in favor of NationsBanc Leasing
of North Carolina in connection with the acquisition of the Equipment by
Lessor, referred to herein as the "Bank Lien") and that it has the right to
lease the Equipment.  The Lessor further warrants that during the term of this
Lease, so long as the Lessee is not in default of any other provisions thereof,
the Lessee shall enjoy use of the Equipment free and clear of any person
claiming title to or an interest in the Equipment by reason of the acts or
omissions of the Lessor.

         (b) THE LESSOR MAKES NO OTHER REPRESENTATIONS OR WARRANTIES, EXPRESS
OR IMPLIED AS TO THE EQUIPMENT INCLUDING AS TO ITS VALUE, CONDITION, DESIGN,
OPERATION, MERCHANTABILITY OR FITNESS FOR USE FOR ANY PARTICULAR PURPOSE, AS TO
THE ABSENCE OF LATENT OR OTHER DEFECTS, WHETHER OR NOT DISCOVERABLE, AS TO THE
ABSENCE OF ANY INFRINGEMENT OF ANY PATENT, TRADEMARK OR COPYRIGHT OR ANY OTHER
REPRESENTATION OR WARRANTY WHATSOEVER, EXPRESS OR IMPLIED; PROVIDED, HOWEVER,
THAT DURING THE TERM OF THIS LEASE THE LESSOR HEREBY TRANSFERS AND ASSIGNS TO
THE LESSEE ALL MANUFACTURERS' WARRANTIES CONCERNING THE EQUIPMENT AND WILL
ASSIST THE LESSEE WITH ANY CLAIMS AGAINST THE MANUFACTURER OF THE EQUIPMENT FOR
DEFECTIVE OR NON-PERFORMING PRODUCT OR DESIGN.

         4.      USE AND OPERATION.  So long as no Event of Default shall occur
and be continuing, the Lessee shall have the full use of the Equipment and may
employ the Equipment in any lawful trade or commerce; provided, however, that
the Lessee covenants and agrees that it will not permit the Equipment to be
incorporated or installed in or attached to the Vessels or any other vessel,
building or real property in such manner as to become part of or subject to any
liens, security interest or encumbrances on the Vessels, any other vessel or
any building or real property or so as to preclude the removal of the Equipment
from the Vessels or any other location without material injury to the Equipment
(it being the intention of the parties that the Equipment is, and shall remain,
personal property throughout the term of this Lease); and provided, further,
that the Equipment shall not be used or operated in any manner contrary to any
applicable law, treaty or convention, or any rule or regulation issued
thereunder.  The Lessee, at its sole cost and expense, shall perform all
routine maintenance and repairs on the Equipment and all major repairs or
overhauls of the Equipment required to keep the Equipment in good operating
condition.

         5.      OWNERSHIP.  This agreement is a lease, and no title, equity or
right in or to the Equipment shall pass to the Lessee except the rights herein
expressly granted, nor shall the Lessee have any lien or charge on the
Equipment.





                                      2
<PAGE>   3
         6.      ALTERATIONS.  With the prior written consent of the Lessor,
the Lessee shall have the right, at its sole expense, to make alterations,
modifications, additions or attachments to the Equipment so long as the value
or usefulness of the Equipment is not reduced thereby.  Except as otherwise
agreed by the Lessor, all alterations, modifications, additions and attachments
of whatsoever kind or nature made to the Equipment shall immediately become the
property of the Lessor and shall be subject to all terms of this Lease.

         7.      LOSS AND DAMAGE.  (a)  The Lessee shall assume and bear the
risk of loss and damage to the Equipment and all component parts thereof from
any cause whatsoever whether or not covered by insurance.  No loss or damage to
the Equipment or any component part thereof shall impair any obligations of the
Lessee under this Lease which shall continue in full force and effect as
hereinafter expressly provided.  The Lessee shall repair or cause to be
repaired all damage to the Equipment.

         (b)  In the event that all or part of the Equipment shall, as a result
of any cause, other than an act or omission of the Lessor, become lost, stolen,
destroyed or rendered irreparably unusable or damaged, as determined by the
Lessee, then the Lessee shall, within ten (10) days after it shall have made
such determination, fully inform the Lessor of such loss or damage and shall
pay the Lessor the then casualty value of the equipment, together with all Rent
and any other sums past due or becoming due to and including the date of such
payment.  Upon payment of said amounts this Lease shall terminate.

         (c)  If the Vessels or the Equipment is taken by requisition or
governmental action as a result of the Lessee's operation of the Vessels or by
virtue of any actions arising by, through or under the Lessee or its agents or
contractors, the Lessee shall be responsible for obtaining the release of the
Equipment, and Rent shall continue until the Lessor receives any insurance
proceeds for such requisition.

         (d)     NOTWITHSTANDING ANY PROVISIONS TO THE CONTRARY CONTAINED IN
THIS SECTION 7 OR ELSEWHERE IN THIS LEASE, IF THERE IS ANY PARTIAL OR TOTAL OR
CONSTRUCTIVE OR COMPROMISED TOTAL LOSS OF ANY OF THE VESSELS OR THE EQUIPMENT
DURING THE PERIOD OF THIS LEASE, THE LESSEE HEREBY AGREES TO INDEMNIFY AND HOLD
HARMLESS THE LESSOR FOR AND AGAINST ANY INSURANCE DEDUCTIBLES AND UNINSURED
LOSSES INCURRED BY THE LESSEE.  ALL SUCH INSURANCE SHORTFALLS SHALL BE PAID BY
LESSEE TO LESSOR ON DEMAND.

         (e)     If, at the time of scheduled redelivery of the Equipment under
this Lease, the Equipment is damaged or otherwise in need of repair or other
work to restore it to pre-hire condition as set forth herein the Lessee shall
continue to pay Rent during such repairs and other work and the Equipment shall
not be considered redelivered until it has been restored to said pre-hire
condition.

         8.      INSURANCE.  Commencing on the date hereof and continuing until
the Lessee has redelivered possession of the Equipment to the Lessor or as
otherwise herein provided, whether or not this Lease has terminated as to the
Equipment, the Lessee, at its expense, agrees to obtain and maintain all risk
public liability and property damage insurance for the Equipment





                                      3
<PAGE>   4
in an amount and with insurers satisfactory to the Lessor; provided, however,
that property damage insurance on the Equipment shall always be in an amount
equal to the casualty value of the Equipment as determined by the Lessor; which
casualty value shall be U.S.$313,925.00 on the date hereof.  The insurance
obtained pursuant to this Section 8 shall not be excess over other coverage but
shall be primary insurance up to and including the stated policy limits and
shall cover the interests of both the Lessor and the Lessee in the Equipment,
or as the case may be, shall protect both the Lessor and the Lessee in respect
to all risks arising out of the condition, delivery, installation, maintenance,
use or operation of the Equipment.  All such insurance shall provide for ten
(10) days prior written notice to the Lessor of cancellation, restriction or
reduction of coverage.  The Lessee hereby irrevocably appoints the Lessor as
the Lessee's attorney-in-fact to make claim for, receive payment of and execute
and indorse all documents, checks or drafts for loss or damage under any
insurance policy issued on the Equipment.  In the event the Equipment shall
sustain a casualty which does not render the Equipment irreparable or unusable
for its intended use, the Lessee shall have the right to the insurance proceeds
upon presentation to the Lessor of a repair estimate or survey showing the
extent of damage and the cost of repair thereof.  Upon receipt of such
insurance proceeds, the Lessee is obligated to apply the proceeds to repair of
the Equipment.  In the event of a casualty which renders the Equipment
irreparable or unusable for its intended use, the Lessor shall have the right
to the insurance proceeds with respect to the Equipment.

         9.      TAXES.  The Lessee shall be responsible for the payment and
discharge of all license or registration fees, assessments, sales and use
taxes, rental taxes, personal property taxes and other taxes (except taxes on
the Lessor's income or profits), now or hereafter imposed by any federal, state
or local government upon the Equipment or upon the leasing, renting, possession
or use thereof (whether the same be assessed on the Lessor or the Lessee).  The
Lessor shall pay any and all such taxes billed or assessed to it, however, if
any such tax is by law to be assessed or billed to the Lessor, the Lessee
agrees to reimburse the Lessor therefor.  The Lessee shall directly pay any
such taxes billed or assessed to it.  The Lessee shall pay to the Lessor the
amount of any taxes remitted by the Lessor within ten (10) days of notice
thereof.  The Lessee upon notice to the Lessor may in the Lessee's own name,
contest or protest any such taxes.  The Lessee shall, in addition, be
responsible to the Lessor for the payment and discharge of any penalties or
interest.

         10.     LIENS AND ENCUMBRANCES.  (a) The Lessee will at all times
protect and defend, at its own cost and expense, the title of the Lessor to the
Equipment and keep the Equipment free and clear from all claims, liens and
other encumbrances, except (i) the rights of the Lessor hereunder, (ii) liens
for taxes either not yet due or being contested in good faith by appropriate
proceedings so long as such proceedings do not involve any danger of the sale,
forfeiture or loss of the Equipment, (iii) inchoate materialmen's, mechanics',
workman's, repairman's, employees' or other like liens arising in the ordinary
course of business and not delinquent, and (iv) the Bank Lien.  Notwithstanding
the foregoing, nothing contained in this Lease shall require the Lessee to take
any action to protect and defend the Equipment from any liens, claims or other
encumbrances arising out of the acts or omissions of the Lessor or any
shareholder, affiliate, employee, agent or representatives of the Lessor.

         (b)  Neither the Lessee nor the masters of the Vessels nor any other
person shall have the right, power or authority to create, incur or permit to
exist upon the Equipment any lien,





                                      4
<PAGE>   5
charge or encumbrance.  As of the date hereof, the Lessee has placed, and all
at times during the term of this Lease shall keep prominently displayed on the
Equipment a legible notice on a metal plate not less than six inches wide by
nine inches high reading as follows:

         "This seismic equipment is owned by EAGLE GEOPHYSICAL, INC., is not a
         part of this vessel and cannot be encumbered by any liens arising
         against this vessel."

         11.     INDEMNITY.  THE LESSEE ASSUMES ALL RISK OF LIABILITY FOR ANY
DAMAGE OR LOSS TO THE EQUIPMENT, INCLUDING, BUT NOT LIMITED TO, ANY ARISING
FROM LIENS IMPOSED ON THE EQUIPMENT IN VIOLATION OF SECTION 10 ABOVE OR ARISING
FROM THE INCORPORATION OF THE EQUIPMENT INTO THE VESSELS, ANY OTHER VESSEL OR
ANY REAL PROPERTY IN VIOLATION OF SECTION 4 ABOVE, AND FOR INJURIES TO OR
DEATHS OF PERSONS AND/OR LOSS OF OR DAMAGE TO PROPERTY (INCLUDING, WITHOUT
LIMITATION, DAMAGE TO THE ENVIRONMENT AND PROPERTY, DUE TO POLLUTION OR THE
RELEASE OF HAZARDOUS WASTES OF ANY KIND) ARISING FROM OR INCIDENT TO THE
EQUIPMENT'S USE OR OPERATION, WHETHER SUCH INJURIES OR DEATHS INVOLVE THE
LESSEE'S EMPLOYEES OR OTHER PERSONS, AND WHETHER SUCH LOSS OR DAMAGE INVOLVES
PROPERTY OF THE LESSEE AND ITS EMPLOYEES AND CONTRACTORS OR OF OTHERS.  THE
LESSEE WILL INDEMNIFY AND HOLD HARMLESS THE LESSOR (AND ANY FIRM OR CORPORATION
SUBSIDIARY TO, AFFILIATED WITH OR UNDER THE SAME MANAGEMENT AS THE LESSOR)
AGAINST AND FROM ALL LOSS, DAMAGE, LIABILITY AND EXPENSE, INCLUDING ATTORNEYS'
FEES, ARISING FROM OR IN CONNECTION WITH SUCH INJURY, DEATH, LOSS OR DAMAGE TO
PROPERTY OR THE ENVIRONMENT, HOWSOEVER CAUSED AND WHETHER RESULTING IN WHOLE OR
IN PART FROM THE NEGLIGENCE OR OTHER FAULT OF EITHER PARTY, BUT ONLY INSOFAR AS
SAID LOSS, DAMAGE, LIABILITY OR EXPENSE ARISES IN CONNECTION WITH THE LESSEE'S
ACCEPTANCE, USE, POSSESSION, OPERATION, OR RETURN OF THE EQUIPMENT UNDER THIS
LEASE.

         12.     LESSOR MAY PERFORM.  Should the Lessee fail to make any
payment or do any act as provided by this Lease, then the Lessor shall have the
right (but not the obligation), without notice to the Lessee and without
releasing the Lessee from any obligations hereunder, to make or do the same or
to make advances to preserve the Equipment or the Lessor's title thereto and to
pay, purchase, contest or compromise any insurance premium, encumbrance,
charge, tax, lien or other sum which in the judgment of the Lessor appears to
affect the Equipment, and in exercising such rights, the Lessor may incur any
reasonable liability and expend reasonable amounts necessary therefor.  All
sums so incurred or expended by the Lessor shall be due and payable by the
Lessee within ten (10) days of notice thereof.

         13.     ASSIGNMENT AND SUBLEASE.  Any transfer, assignment, sublease,
conveyance or pledge of the Lessee's interest in and to this Lease or the
Equipment, whether by operation of law or otherwise, without the prior written
consent of the Lessor, shall be void.  The Lessor, its successors or assigns,
may assign this Lease or grant a security interest therein or in the Equipment
in whole or in part.  However, unless the Lessee receives written notice of





                                      5
<PAGE>   6
such assignment, the Lessee shall have no obligation to pay Rent due pursuant
to this Lease to any party other than the Lessor.

         14.     SURRENDER OF THE EQUIPMENT.  At the Lessor's request upon
expiration or earlier termination of this Lease or any renewal or extension
thereof, the Lessee shall return the Equipment to the Lessor in good condition
and working order, ordinary wear and tear resulting from use thereof excepted,
by delivery of the Equipment at the Lessee's cost and expense to a mutually
agreed upon place on the Gulf Coast of the United States.

         15.     EVENTS OF DEFAULT.  The occurrence of any of the following
events, shall constitute an Event of Default under this Lease:

         (a)     the nonpayment by the Lessee of any Rent when due, or the
                 nonpayment by the Lessee of any other sum required hereunder
                 to be paid by the Lessee which nonpayment continues for a
                 period of five (5) days following written notice thereof from
                 the Lessor;

         (b)     the failure of the Lessee to perform any other term, covenant
                 or condition of this Lease which is not cured within ten (10)
                 days after written notice thereof from the Lessor;

         (c)     the Lessee ceases doing business as a going concern, is
                 insolvent, makes an assignment for the benefit of creditors,
                 admits in writing its inability to pay its debts as they
                 become due, files a voluntary petition in bankruptcy, is
                 subjected to an involuntary petition in bankruptcy which is
                 not released or dismissed within thirty (30) days after
                 filing, is adjudicated bankrupt or insolvent, files or has
                 filed against it a petition seeking any reorganization,
                 arrangement or composition, under any present or future
                 statute, law or regulation;

         (d)     any of the Lessee's representations or warranties made in this
                 Lease or in any statement or certificate at any time given in
                 writing pursuant to this Lease or in connection herewith shall
                 be false or misleading in any material respect; or

         (e)     the Lessee defaults under or otherwise has accelerated any
                 material obligation, credit agreement, loan agreement,
                 conditional sales contract, lease, indenture or debenture or
                 the Lessee defaults under any other agreement with the Lessor.

         16.     REMEDIES.  (a)  Should any Event of Default occur and be
continuing, the Lessor may, without notice to or demand upon the Lessee,
without retaking possession of the Equipment, accelerate and cause to become
immediately due and payable all Rent and other sums payable under the terms
hereof; or may retake (by the Lessor, independent contractors, or by requiring
the Lessee to assemble the Equipment for the Lessor at a location designated by
the Lessor) possession of the Equipment (without liability to the Lessee
therefor which is hereby expressly waived) and either:

         (i)     retain possession of the Equipment until the Lessor shall
                 terminate the Lessee's interest in the Equipment by giving the
                 Lessee written notice to that effect, in





                                      6
<PAGE>   7
         which event the Lessee shall be liable for all rents and other sums
         accrued and unpaid prior to such termination;

         (ii)    lease the Equipment to a third party for the account of the
                 Lessee and recover from the Lessee any deficiency between the
                 rents provided for herein and those received from such third
                 party;

         (iii)   sell the Equipment at public or private sale, in which event
                 the Lessee shall pay to the Lessor upon demand the amount, if
                 any, by which the net proceeds of such sale shall be less than
                 the casualty value of the Equipment; or

         (iv)    recover from the Lessee the excess of the rents and charges
                 provided for in this Lease for the balance of the term over
                 the then reasonable rental value of the Equipment for the same
                 period.

         (b)     The Lessor may enforce any one or more of the remedies
hereunder successively or concurrently, and any such action shall not prevent
the Lessor from pursuing any further remedy the Lessor may have hereunder or at
law or in equity.  Time and exactitude of each of the terms and conditions
hereof are hereby declared to be of the essence of this Lease.  The Lessor may
accept past due payments without modifying the terms of this Lease and without
waiving any further rights.  The Lessor shall not be obligated to sell or
release the Equipment.  Nevertheless, in the event of a public sale the Lessor
may bid upon and purchase the Equipment.

         17.     INSPECTION BY LESSOR.  The Lessor, its agents, representatives
or employees, shall at any and all reasonable times during regular working
hours have the right to board the Vessels for the purpose of inspecting the
Equipment and observing its use.

         18.     COSTS AND ATTORNEYS' FEES.  In the event of any action at law
or a suit in equity by reason of the Lessee's breach of this Lease or any
governmental examination or investigation of the Lessee, which requires the
Lessor's participation and which participation would not be required but for
this Lease, or pursuant to the Lessor exercising any of its rights provided for
in this Lease or by applicable law, the Lessee, in addition to all other sums
which the Lessee may be called upon to pay under the provisions of this Lease,
will pay to the Lessor its reasonable costs of collection or other reasonable
out-of-pocket costs and expenses and attorneys' fees.

         19.     INTEREST AND SERVICE CHARGES.  Any amounts required to be paid
by the Lessee pursuant to this Lease, and not paid when due (except payments of
taxes being properly contested) shall bear interest at the rate of 1.25% per
month until payment.

         20.     OFFSETS.  The Rent and all other sums payable hereunder shall
be paid without notice, demand, counterclaim, setoff, deduction or defense and
without abatement, suspension, deferment, diminution or revocation, and the
obligations and liabilities of the Lessee under this Lease shall not be
affected for any reason.  This Lease shall not be terminable by the Lessee in
whole or in part except as specifically provided in Sections 7 and 16 of this
Lease.





                                      7
<PAGE>   8
         21.     HEADINGS.  Section headings herein are used for convenience
only and shall not otherwise affect the provisions of this Lease.

         22.     EFFECT OF WAIVER.  No failure or delay on the part of the
Lessor in the exercise of any remedy, power, right or privilege hereunder shall
operate as a waiver thereof, nor shall any single or partial exercise of any
such remedy, power, right or privilege preclude other or further exercise
thereof or any other remedy, right, power or privilege.  All rights and
remedies existing under this Lease are cumulative to, and not exclusive of, any
rights or remedies otherwise available.

         23.     SURVIVAL OF WARRANTIES.  All agreements, representations and
warranties of the Lessee and the Lessor made herein shall survive the execution
of this Lease.

         24.     APPLICABLE LAW AND ARBITRATION.  (a)  This Lease and all
documents issued or executed pursuant hereto shall be governed by, and
construed under, the internal laws of the State of Texas.  If any provision of
this Lease or any remedy provided herein shall be held to be invalid under any
applicable law, such provision shall be inapplicable and deemed omitted, but
the remaining provisions of this Lease shall be and remain effective in
accordance with their terms.  This Lease may only be amended or modified by an
instrument in writing signed by a duly authorized representative of the party
to be charged thereby.

         (b)  Any controversy or claim arising out of or relating to this
Lease, or the alleged breach thereof, which cannot be resolved between the
Lessor and the Lessee shall be referred to arbitration before the Society of
Marine Arbitrators, Inc. before three (3) persons, one to be appointed by the
Lessor, one by the Lessee and the third by the two so chosen; their decision or
that of any two of them shall be final.  The proceedings shall be conducted in
accordance with the Rules of such Society then in effect; provided, however,
that such arbitration proceedings shall take place in Houston, Texas.  Any
award of the arbitration panel shall be final and binding on both parties and
may be enforced in the U.S. District Court for the Southern District of Texas,
or any other court having jurisdiction over the parties.  The Lessor and the
Lessee agree that neither party shall have any right to commence or maintain
any suit or legal proceeding concerning any dispute hereunder, other than a
suit for enforcement of the arbitration provisions contained in this Section
24(b), until the dispute has been determined in accordance with the arbitration
procedure provided for herein and then only for enforcement of the award
rendered under such arbitration.

         25.     COUNTERPARTS.  This Lease may be executed in any number of
counterparts, each of which shall be deemed an original, but all such
counterparts together shall constitute but one and the same instrument.

         26.     NOTICES.  (a)  All notices, requests, consents, demands and
other communications provided for or permitted hereunder shall be effective
three (3) days after being duly deposited in the mails, certified, return
receipt requested, or upon receipt if delivered to Federal Express or similar
courier company or transmitted by telefax, addressed to the respective party at
the address set forth below:





                                      8
<PAGE>   9
                 Lessor:  Eagle Geophysical, Inc.
                          50 Briar Hollow Lane, 7th Floor West
                          Houston, Texas  77027
                          Fax No. (713) 627-2319
                          
                 Lessee:  Horizon Exploration Limited
                          6 Pembroke Road
                          Sevenoaks
                          Kent TN13 1XR
                          England
                          Fax No. 011-441-732-742-977

         (b)     Either of the parties hereto may change its address by notice
in writing given to the other party to this Lease.

         27.     TERMINATION UPON DEFAULT UNDER NATIONSBANK LOAN.  The parties
hereto acknowledge that Lessor has financed the acquisition of the Equipment
with the proceeds of a loan from NationsBanc Leasing Corporation of North
Carolina ("NationsBanc").  Notwithstanding the lease of the Equipment by Lessor
to Lessee hereunder, Lessor shall remain fully obligated and in compliance with
the terms and conditions of the agreement governing the loan from NationsBanc
(the "Loan Agreement").  Upon NationsBanc's delivery to Lessee of notice that
an Event of Default (as such term is defined in the Loan Agreement) has
occurred and is continuing under the Loan Agreement and that NationsBanc has
commenced the exercise of remedies with respect to the Equipment under the Loan
Agreement, this Lease will automatically terminate and be of no further force
or effect, and Lessee will cause the Equipment to be delivered to NationsBanc
at a place to be designated by NationsBanc.  Any termination of this Lease
pursuant to this Paragraph 27 shall be without prejudice to any claims of the
parties hereto against each other with respect to this Lease arising prior to
or as a result of such termination.

                                        
                                        EAGLE GEOPHYSICAL, INC.
                                        
                                        
                                        By: /s/ JAY SILVERMAN
                                          --------------------------------------
                                           Jay Silverman, President
                                        
                                        
                                        HORIZON EXPLORATION LIMITED
                                        
                                        
                                        By: /s/ GERRY HARRISON
                                           -------------------------------------
                                           Name:  Gerry Harrison
                                                --------------------------------
                                           Title: Director
                                                 -------------------------------
                                        
                                        


                                      9

<PAGE>   1

                                                                   EXHIBIT 10.52


                             CONTRIBUTION AGREEMENT


         THIS CONTRIBUTION AGREEMENT (this "Agreement") is effective the 30th
day of May, 1997, by and between Seitel, Inc., a Delaware corporation
("Seitel"), and Eagle Geophysical, Inc., a Delaware corporation and
wholly-owned indirect subsidiary of Seitel ("Eagle").

         WHEREAS, Seitel owns eleven thousand seven hundred twenty-eight
(11,728) shares of the issued and outstanding ordinary shares of U.S. $0.001
(the "Shares") of Energy Research International, a Cayman Islands corporation
("ERI"), which shares constitute nineteen percent (19%) of the issued and
outstanding capital stock of ERI; and

         WHEREAS, Seitel desires to contribute the Shares to Eagle as a capital
contribution;

         NOW, THEREFORE, the parties hereto agree as follows:

         1.      Seitel hereby contributes, as of the effective date of this
Agreement, the Shares to Eagle as a capital contribution (the "Capital
Contribution").

         2.      Eagle, by its execution of this Agreement, acknowledges
receipt of the Capital Contribution.

         3.      Seitel hereby assigns to Eagle all of its rights under that
certain Stock Purchase Agreement dated July 3, 1996 among Seitel, ERI and
others (the "Stock Purchase Agreement") and that certain Repurchase and Credit
Agreement dated November 15, 1996, between Seitel and ERI (the "Repurchase
Agreement"), excluding any rights relating to, including but not limited to the
right to receive payment under, that certain promissory note made by ERI and
payable to Seitel in the original principal amount of $2,679,040.00 dated
November 15, 1996 executed in connection with the Repurchase Agreement.

         4.      Eagle hereby assumes all of Seitel's obligations under the
Stock Purchase Agreement and the Repurchase Agreement, except for the
obligations of Seitel under the Registration Rights Agreement (as such term is
defined in the Stock Purchase Agreement).

         IN WITNESS WHEREOF, the parties hereto have executed this Agreement
effective as of the day and year first above written.
                                        
                                        SEITEL, INC.
                                        
                                        
                                        By: /s/ Paul A. Frame
                                                Paul A. Frame, President
<PAGE>   2
                                        EAGLE GEOPHYSICAL, INC.
                                        
                                        
                                        By: /s/ Jay N. Silverman
                                                Jay N. Silverman, President






<PAGE>   1
                                                                   EXHIBIT 10.53



                   THE BANK OF N.T. BUTTERFIELD & SON LIMITED

                           ASSIGNMENT OF LIFE POLICY

                                  The Schedule

<TABLE>
  <S>                     <C>                   <C>                 <C>                <C>
====================================================================================================
  Date:
- ----------------------------------------------------------------------------------------------------
  Policy Owner:

  Horizon Exploration Ltd

  6 Pembroke Road

  Sevenoaks

  Kent, TN13 1XR

  Policy Details:

- ----------------------------------------------------------------------------------------------------

  Date & Number           Insurer's Name        Life Assured        Sum Assured        Maturity Date

  9 Dec, 1993             National              Gerald Martin       L.250,000          9 Dec, 1998

  D137343F                Westminster           Harrison

                          Life Assurance

- ----------------------------------------------------------------------------------------------------
  Loan Agreement:

  Dated 23 August 1994
- ----------------------------------------------------------------------------------------------------
  Policy Owner's

  Solicitors:

====================================================================================================

</TABLE>

<PAGE>   2
THIS ASSIGNMENT is made on the date set out in the Schedule BETWEEN THE
POLICY OWNER of the one part and THE BANK of the other part

NOW IT IS WITNESSED

1.       Definitions

The Policy Owner          The Policy Owner described in the Schedule and so
                          that where the Policy Owner includes more than one
                          person or corporate body the term "the Policy Owner"
                          shall be construed as referring to all or any one or
                          more of those persons or corporate bodies and the
                          obligations of the Policy Owner shall be joint and
                          several

The Bank                  The Bank of N.T. Butterfield & Son Limited
                          incorporated in Bermuda with limited liability and
                          having its London Branch Office at 24 Chiswell Street
                          London EC1Y 4TY and where the context admits the term
                          "the Bank" includes its successors and assigns
                          whether immediate or derivative

The Policy                The policy or policies of assurance brief details of
                          which are set out in the Schedule and so that where
                          the Policy includes more than one such policy of
                          assurance the term "the Policy" shall be construed as
                          referring to all or any one or more of those policies
                          as the context admits or requires and likewise to any
                          substituted policy or policies of assurance as are
                          referred to herein

The Loan Agreement        The Loan Agreement or Facility Letter (if any) of
                          which brief details are specified in the Schedule

Interest Rate             The rate of interest specified in the Loan Agreement
                          or where there is no Loan Agreement or the rate
                          specified therein cannot be ascertained the usual
                          rate of interest of the Bank in dealing with current
                          accounts payable on such days as the Bank may from
                          time to time determine and compounded in the event of
                          it not being punctually paid with monthly quarterly
                          or other periodic rests as the Bank shall deem fit
                          (but without prejudice to the right of the Bank to
                          require payment of such interest) and in the absence
                          of





                                       1
<PAGE>   3
                          manifest error the certificate of an authorised
                          officer of the Bank shall be conclusive as to the
                          rate from time to time applicable

2.       Assignment

2.1      This Assignment is expressly made for securing present and further
advances

2.2      The Policy Owner as beneficial owner HEREBY ASSIGNS unto the Bank
(subject only to the proviso for re-assignment in Clause 2.3) the Policy and
all money (including bonuses) that may at any time become payable thereunder
and the benefit of all powers and remedies for enforcing the same and all
options rights and monies devolving upon the Policy Owner therefrom or under or
from any policy or policies that may be substituted therefor with power to give
an effectual discharge for all or any of the monies assured or to become
payable thereunder as a continuing security for:-

2.2.1    All present and/or future indebtedness of the Policy Owner to the Bank
         on any account whatsoever as mentioned in clause 3.1 hereof

2.2.2    All other liabilities whatsoever of the Policy Owner to the Bank
present future actual or contingent

2.2.3    All costs and expenses arising hereunder as hereinafter provided
together in each case with interest thereon from day to day from demand until
full discharge (as well after as before judgment or the death insanity
insolvency or other incapacity of the Policy Owner) at the Interest Rate TO

HOLD the same unto the Bank absolutely

2.3      Provided that if the Policy Owner or the successors in title of the
Policy Owner shall pay to the Bank all moneys and discharge all obligations and
liabilities hereby secured the Bank shall at the request and cost of the Policy
Owner or such successors in title reassign the same to the Policy Owner or such
successors in title or as they shall direct

3.       Policy Owner's Covenants

The Policy Owner COVENANTS with the Bank

3.1      ON DEMAND (save where otherwise specified in the Loan Agreement or
agreed in writing between the parties hereto) to pay to the Bank all money and
discharge all obligations liabilities as now are or at any time hereafter may
be due owing or incurred from or by the Policy Owner to the Bank or for





                                       2
<PAGE>   4
which the Policy Owner may be or become liable to it in whatever currency
denominated on any current or other account or in any manner whatever (whether
alone or joint with any other person or corporate body and in whatever style or
form and whether as principal or surety) including (without prejudice to the
generality of the above) all liabilities in connection with foreign exchange
transactions and for accepting endorsing or discounting any notes or bills
and/or under bonds guarantees documentary or other credits or any instruments
whatsoever from time to time entered into by the Bank for or at the request of
the Policy Owner or for any other matter or thing whatsoever including interest
to the date of repayment (calculated at the Interest Rate and payable as well
after as before judgment or the death insanity insolvency or other incapability
of the Policy Owner) commission fees and other charges and all legal and other
costs charges and expenses on a full indemnity basis together with any Value
Added Tax at the applicable rate which may be or become due in respect of all
or any such matters.

3.2      Punctually to pay all premiums and money payable for keeping up the
Policy and any substituted policy or policies and on demand to deliver to the
Bank the receipt for any such premium and money and if the Policy Owner shall
at any time make default in payment of any such sum or sums it shall be lawful
for the Bank to pay the same on its own account or as agent for the Policy
Owner as it deems fit and the Policy Holder will pay to the Bank on demand any
amount thus expended

3.3      That the Policy is valid and that the Policy Owner will not do any act
or commit any default whereby the Policy or any substituted policy or policies
may become void or voidable or any increased premium thereon become payable or
whereby the Bank may be hindered or prevented from receiving any money thereby
assured and if the Policy shall at any time become voidable the Policy Owner
will forthwith at the sole cost of the Policy Owner do all such things as shall
be requisite to procure that the same remains valid and of full force and
effect

3.4      That in case the Policy shall by any means become void the Policy
Owner will forthwith at the sole cost of the Policy Owner effect a new policy
or policies in lieu thereof or do all such things as may be necessary to enable
the Bank so to do (as it is hereby authorised to do) in such manner as the Bank
may require in some assurance company or society or other office to be approved
by the Bank in a sum not less than (and having a surrender value not less than)
the sum which was assured by the Policy which shall have become void including
any bonus or bonuses which may have been declared thereon and every such new or
substituted policy or policies shall





                                       3
<PAGE>   5
be subject in all respects to this security and all the covenants and
provisions contained herein and implied by statute shall apply thereto

3.5      That the Policy Owner will forthwith at the sole cost of the Policy
Owner and at the request of the Bank execute any deed or document and do all
such other things as shall be considered necessary or desirable by the Bank in
its unfettered discretion in order to procure that this Assignment takes effect
as a legal assignment of the Policy or to perfect or improve this Assignment in
any other manner whatsoever or to assign any substituted policy or policies as
aforesaid all such further assignments deeds and documents to be prepared by or
on behalf of the Bank at the cost of the Policy Owner and to contain such
clauses for the benefit of the Bank and otherwise as the Bank may reasonably
require

3.6      That the Policy Owner has not borrowed and will not borrow or attempt
to borrow any sum from the assurance company or society or other office which
has issued the Policy whether such borrowing be pursuant to the terms of the
Policy or otherwise

3.7      That the Policy Owner will at all times observe and comply with the
proper requirements of the assurance company or society or other office which
has issued the Policy and will notify the Bank of any notice or information
received or issued by or on behalf of the Policy Owner in respect of the Policy
and further will supply to the Bank on demand such other information (including
a copy of any document) in relation to the Policy as the Bank shall from time
to time require

3.8      That the Policy Owner will not save as provided in this Assignment or
authorised by the Bank in writing assign sell part with transfer charge pledge
create any lien or security interest in or over waive surrender release vary or
otherwise deal or purport to deal or attempt to deal with the Policy

3.9      That the Policy Owner will deposit with the Bank and permit the Bank
during the continuance of this security to hold and retain the Policy and all
other deeds and documents relating to the Policy as the Bank may from time to
time require

3.10.1   That the Policy Owner will pay on a full indemnity basis to the Bank
         on demand the amount of all expenses properly incurred by the Bank in
         relation to the Policy and this Assignment with interest thereon at
         the





                                       4
<PAGE>   6
         Interest Rate from the respective time and times at which such money
         shall have been expended until the date of repayment and until
         repayment such sums and interest shall be charged on the Policy

3.10.2   For the avoidance of doubt IT IS HEREBY AGREED that the expression
         "expenses" includes all costs moneys charges and expenses properly
         paid and all liability properly incurred by the Bank (including legal
         costs charges and expenses ascertained as between solicitor and own
         client) on or in connection with or incidental to the Policy and this
         Assignment and all expenses herein covenanted by the Policy Owner to
         be paid and in particular in connection with

         3.10.2.1         obtaining any report of any nature or of any kind
         whatsoever in connection with the Policy

         3.10.2.2         investigating any matter in relation to the Policy
         and/or considering enforcing or attempting to enforce the rights and
         powers of the Bank hereunder or under the general law

         3.10.2.3         doing or considering any other matter or thing
         whatsoever which the Bank reasonably considers to be for the benefit
         of or preservation of or the more advantageous realisation of the
         Policy

3.11     To pay into such account with the Bank in the name of the Policy Owner
or to such other account as the Bank shall direct all monies received by the
Policy Owner under or by virtue of the Policy and pending such payment to hold
such moneys in trust for the Bank

4.       Default

In case of default by the Policy Owner in the performance of any covenant in
relation to the Policy it shall be lawful for but not obligatory upon the Bank
to do whatever may be necessary to make good such default and any expenses
incurred by the Bank in that behalf with interest thereon at the Interest Rate
from the respective time or times at which such money shall have been expended
until the date of repayment shall be deemed to be properly incurred for the
purposes of this Assignment and shall be charged on the Policy

5.       Power of Sale

5.1      Section 103 of the Law of Property Act 1925 shall not apply hereto and
the statutory power of sale and other powers of the Bank (whether given by
statute or expressed herein) shall be exercisable without further notice at any
time after demand for payment of any money or the performance of any





                                       5
<PAGE>   7
obligation or discharge of any liability hereby secured whether or not the
Policy Owner shall have been accorded sufficient time or any time in which to
satisfy the demand made and the date of such demand shall (without prejudice to
the equitable right of redemption) be the redemption date

5.2      No assurance company or society or other office which has issued the
Policy nor any purchaser or other person shall be bound or concerned to see or
enquire whether the right of the Bank to exercise any of the powers hereby
conferred has arisen or not or be concerned with notice to the contrary or with
the propriety of the exercise of or purported exercise of such powers

6.       Powers of Bank

6.1      At any time after demand as aforesaid the Bank may without further
demand or notice at its discretion

6.1.1    Surrender the Policy to the assurance company or society or other
         office liable thereon or exchange the Policy for a paid up policy in
         either case for such consideration and upon such terms and             
         conditions as the Bank deems fit
        
6.1.2    Exercise the statutory power of sale and sell the Policy by public
         auction or private contract or otherwise for such consideration and
         generally on such terms and conditions as the Bank deems fit and with
         power to buy rescind or vary any contract for sale and to resell the
         same without being liable for any loss or diminution in the price
         obtained
        
6.1.3    Exercise all or any of the Policy Owner's rights and powers in
         relation to the Policy or decline to do so

6.1.4    Borrow (for the purpose of applying the same as provided in
         Clause 6.4) from the assurance company society or other office which
         has issued the Policy such sum or sums as the Bank deems fit and upon
         such terms as the Bank shall agree including terms whereby the Policy
         Owner shall be liable for all sums thus borrowed including interest
         thereon and other charges
        
6.1.5    Surrender release vary extend or otherwise deal with all or any of the
         Policy Owner's rights and powers in relation to the Policy

6.1.6    Appropriate the whole or any part of the monies standing to the credit
         of any account mentioned in clause 3.11 in or towards the satisfaction
         of the Policy Owner's indebtedness to the Bank and if the Bank does
        




                                       6
<PAGE>   8
         not do so then (unless the Bank gives express notice to the contrary
         to the Policy Owner) it shall nevertheless be treated as if it had
         done so at the time of demand as aforesaid
        
6.2      The receipt of an authorised officer of the Bank for any money which
may be or become payable or for any policy which may be or become deliverable
for or in respect of or in exchange for the Policy (whether on a sale or
surrender or otherwise) shall effectually discharge the person or persons
paying or delivering the same therefrom and from being concerned to see to the
application or being answerable for the misapplication thereof and such person
or persons shall not be bound or concerned to see or enquire whether at the
time of such payment or delivery any money remains owing upon this security

6.3      All money expended by the Bank shall on demand be repaid by the Policy
Owner with interest thereon at the Interest Rate from the respective time or
times at which such money shall have been expended until the date of repayment

6.4      All money received by the Bank in the exercise of any powers conferred
by this Assignment shall be applied after the discharge of all liabilities (if
any) having priority thereto in or towards satisfaction of such of the moneys
obligations and liabilities hereby secured and in such order as the Bank in its
absolute discretion may from time to time conclusively determine (save that the
Bank may credit the same to a suspense account for so long and in such manner
as the Bank may from time to time determine)

7.       Consents and Notices

7.1      Any consent to be given by the Bank hereunder may be given by writing
under the hand of an authorised officer of the Bank

7.2      A demand for payment or any other demand or notice under this
Assignment shall be effective notwithstanding the death insanity insolvency or
other incapacity of the Policy Owner and shall be made or given in writing by
any agent or solicitor or authorised officer of the Bank and (in the case of an
individual) served upon the Policy Owner or his personal representatives
personally or delivered or sent by first class letter post cable telex or
facsimile transmission to the Policy Owner or his personal representatives at
his or their usual place of abode or place of business last known to the Bank
or (in the case of a corporate body) served on any one of its directors or the
company secretary or delivered or sent as aforesaid to its registered office or
the address or place of business





                                       7
<PAGE>   9
of the Policy Owner last known the Bank or (in either case) delivered or sent
as aforesaid to the address of the Policy Owner stated in the Schedule and a
demand or notice so addressed and posted shall be deemed to be delivered forty
eight hours after posting and shall be effective notwithstanding that it be
returned undelivered and in proving such service it shall be sufficient to
prove that the notice or demand was properly addressed and posted and any
notice or demand sent by cable telex or facsimile transmission shall be deemed
to have been served at the time of despatch and shall be effective
notwithstanding any incomplete or distorted transmission and in proving such
service it shall be sufficient to prove that the notice or demand (if by cable)
was properly addressed and dispatched or (if by telex or facsimile
transmission) was transmitted to the correct number from which the correct
answerback or other appropriate acknowledgement of receipt was obtained

7.3      In the case of the death of any person a party hereto and until
receipt by the Bank of notice in writing of the grant of representation to the
estate of the deceased any notice or demand by the Bank sent by first class
letter post cable telex or facsimile transmission as aforesaid addressed to the
deceased or to his personal representatives at the usual place of abode or
place of business of the deceased last known to the Bank shall for all purposes
be deemed a sufficient service of a notice or demand by the Bank on the
deceased and his personal representatives and shall be as effectual as if the
deceased were still living

7.4      Any such notice or demand or any certificate as to the amount at any
time secured hereby shall (in the absence of manifest error) be conclusive and
binding upon the Policy Owner if signed by any agent or solicitor or authorised
officer of the Bank

8.       Continuing Security and Banking Powers

8.1      This Assignment shall be a continuing security to the Bank
notwithstanding the death insanity insolvency or other incapacity of the Policy
Owner and shall not be prejudiced by repayment or partial repayment of sums
from time to time owing by the Policy Owner to the Bank or by the settlement of
any account and is in addition to and shall not merge with or otherwise
prejudice or affect any contractual or other right or remedy or any collateral
or other securities now or hereafter held or available for any of the moneys
hereby secured (even if the same shall be taken without the consent or against
the prohibition of the Policy Owner in respect of moneys for which the Policy





                                       8
<PAGE>   10
Owner is or shall be liable as surety only) and this Assignment shall not be in
any way prejudiced or affected thereby or by the invalidity thereof or by the
Bank now or hereafter dealing with exchanging releasing varying or abstaining
from perfecting or enforcing any of the same or any rights which it may now or
hereafter have or giving time for payment or other indulgence or compounding
with any other person liable

8.2      The Bank may from time to time give time for payment of any bill or
bills of exchange promissory note or notes or other security or securities
which may have been discounted for or received in account from the Policy Owner
by the Bank or on which the Policy Owner shall or may be liable as drawer or
endorser or otherwise liable thereon as the Bank shall in its discretion think
fit without in any manner releasing the Policy Owner or affecting the security
hereby created and nothing herein contained shall operate so as to merge or
otherwise prejudice or affect any bill note guarantee mortgage or other
security which the Bank may for the time being have for any money or
liabilities due or incurred by the Policy Owner to the Bank or any right or
remedy of the Bank thereunder

8.3      The Bank may upon receiving notice of any charge or other interest
affecting the Policy (whether or not the Bank has consented hereunder to such
charge or the creation of such other interest) close the then current account
and open a new account with the Policy Owner and if the Bank does not open a
new account then (unless the Bank gives express notice to the contrary to the
Policy Owner) it shall nevertheless be treated as if it had done so at the time
when it received such notice and as from that time no money paid in or carried
to the credit of the Policy Owner in such new account shall be appropriated
towards or have the effect of discharging any part of the amount due to the
Bank on the said closed account at the time when it received such notice as
aforesaid

8.4      If the Policy Owner shall have more than one account with the Bank
(whether in the name of the Bank for the account of the Policy Owner or of the
Policy Owner jointly with others and whether current deposit loan or of any
other nature whatsoever whether subject to notice or not and whether in
Sterling or in any other currency and wheresoever situate) the Bank may at any
time and without any prior notice in that behalf forthwith transfer all or any
part of any balance standing to the credit of any such account to any other
such account which may be in debit or in respect of which there are outstanding
obligations or liabilities (be they present future actual contingent primary
collateral several or joint) and so that where the expression "the Policy
Owner" includes more than one person or corporate body such transfer may be
made from any account in the name of one or more such persons or corporate





                                       9
<PAGE>   11
bodies to any account in the name of the Policy Owner and where such
combination or transfer requires the conversion of one currency into another
such conversion shall be calculated at the then prevailing spot rate of
exchange of the Bank (as conclusively determined by the Bank) for purchasing
the currency for which the Policy Owner is liable with the existing currency so
converted

8.5      None of the persons or corporate bodies included in the expression
"the Policy Owner"  shall as against the Bank be entitled to any of the rights
or remedies legal or equitable of a surety as regards the indebtedness or
liabilities of any of the other persons or corporate bodies included in the
expression "the Policy Owner"

8.6      The execution of this Assignment by the Policy Owner shall constitute
an authority on the part of the Policy Owner to the Bank to disclose to any
bank or financial institution to whom the Bank is proposed to assign all or any
of its rights hereunder or to offer or grant a participation in any loan
secured by this Assignment such information concerning the affairs of the
Policy Owner insofar as they relate to the Policy in such manner and to such
extent as the Bank shall from time to time deem fit

9.       Currency Clauses

9.1      All moneys received or held by the Bank under this Assignment may from
time to time be converted into such other currency as the Bank considers
necessary or desirable to cover the obligations and liabilities of the Policy
Owner in that currency at the then prevailing spot rate of exchange of the bank
(as conclusively determined by the Bank) for purchasing the currency to be
acquired with the existing currency

9.2      If and to the extent that the Policy Owner fails to pay the amount due
on demand the Bank may in its absolute discretion without notice to the Policy
Owner purchase at any time thereafter so much of a currency as the Bank
considers necessary or desirable to cover the obligations and liabilities of
the Policy Owner in such currency hereby secured at the then prevailing spot
rate of exchange of the Bank (as conclusively determined by the Bank) for
purchasing such currency with sterling and the Policy Owner hereby agrees to
indemnify the Bank against the full sterling price (including all costs charges
and expenses) paid by the Bank

9.3      No payment to the Bank (whether under any judgment or court order or
otherwise) shall discharge the obligation or liability of the Policy Owner in
respect of which it was made unless and until the Bank shall have





                                       10
<PAGE>   12
received payment in full in the currency in which such obligation or liability
was incurred and to the extent that the amount of any such payment shall on
actual conversion into such currency fall short of such obligation or liability
expressed in that currency the Bank shall have a further separate cause of
action against the Policy Owner and shall be entitled to exercise all or any of
its rights under this Assignment to recover the amount of the shortfall

10.      Power of Attorney

10.1     As security for the covenants hereinbefore contained and in
consideration of the Bank making available or continuing to make available
banking facilities to the Policy Owner the Policy Owner hereby irrevocably
during the continuance in force of this security appoints the Bank and any
person or corporate body deriving title under the Bank any person nominated in
writing under the hand of an officer of the Bank or any successor in title
severally to be the Attorney of the Policy Owner for the Policy Owner and in
the Policy Owner's name and on the Policy Owner's behalf to execute seal and
deliver or otherwise perfect any deed or other instrument or act which may be
required or deemed proper for any of the purposes of this security (including
any other deed or document referred to in Clause 3.5) or to protect by
registration or otherwise the interest of the Bank hereunder and this
appointment shall operate as a general power of attorney under section 10 of
the Powers of Attorney Act 1971

10.2     The Policy Owner hereby covenants with the Bank and its successors in
title that on request the Policy Owner will ratify and confirm all security
agreements documents acts and things and all transactions entered into by the
Bank or by the Policy Owner at the instance of the Bank in the exercise or
purported exercise of its or their powers and the Policy Owner irrevocably
acknowledges and agrees that such power of attorney is inter alia given to
secure the performance of the obligations owed to the Bank by the Policy Owner

11.      Consolidation

11.1     The restriction of the right of consolidating mortgage securities
contained in section 93 of the Law of Property Act 1925 shall not apply to this
Assignment or to any security given to the Bank pursuant hereto





                                       11
<PAGE>   13
11.2     No failure or delay by the Bank in exercising any right or remedy
shall operate as a waiver thereof nor shall any single or any partial exercise
or waiver of any right or remedy preclude its further exercise or the exercise
of any other right or remedy

11.3     The security given to the Bank pursuant to this Assignment shall
extend to all indebtedness of the Policy Owner to the Bank as mentioned in
clause 3.1 whether or not the Bank was an original party to the relevant
transaction or transactions by virtue of which such indebtedness or any part of
it may from time to time arise

11.4     Each of the provisions of this Assignment is severable and distinct
from the others and if at any time one or more of such provisions is or becomes
invalid illegal or unenforceable the validity legality and enforceability of
the remaining provisions hereof shall not in any way be affected or impaired
thereby

11.5     Each person and corporate body included in the expression "the Policy
Owner" agrees to be bound by this Assignment notwithstanding that any other
such persons or corporate body intended to execute or be bound may not do so or
be effectually bound and notwithstanding that this Assignment may be determined
or become invalid or unenforceable against any one or more persons or corporate
bodies whether or not the deficiency is known to the Bank

12.      Certificate of non-contravention

12.1     The Policy Owner hereby represents and warrants that the Policy Owner
has full power authority and legal right to give and to observe the terms and
conditions of this Assignment and that there is no provision in the memorandum
or articles of association or any other constitutional document of any
corporate body included in the expression "the Policy Owner" or in any other
corporate document mortgage indenture trust deed or any other agreement binding
upon the Policy Owner or affecting the Policy Owner which would inhibit or
prevent the Policy Owner from entering into the obligations set out in this
Assignment or prevent conflict with or affect the Policy Owner's performance or
observance of any of the terms of this Assignment

12.2     The Policy Owner hereby undertakes to the Bank that the Policy Owner
will obtain and maintain in full force and effect all governmental and other
approvals and consents and do or cause to be done all other acts and things
necessary or desirable in connection herewith or for the performance of the
Policy Owner's obligations hereunder





                                       12
<PAGE>   14
13.      Proper Law and Jurisdiction

13.1     This Assignment shall be governed by and construed in accordance with
the Law of England and Wales and the Policy Owner hereby irrevocably submits to
the non-exclusive jurisdiction of the Courts in England and Wales

13.2     Without prejudice to the generality of the provisions of sections 695
and 725 of the Companies Act 1985 and the Rules of the Supreme Court for the
time being the Policy Owner hereby irrevocably authorises and appoints the
Solicitors named in the Schedule (or such other person being a firm of
solicitors resident in England or Wales as the Policy Owner may by notice to
the Bank substitute) to accept service of all legal process arising out of or
connected with this Assignment and service on those Solicitors (or such
substitute) shall be deemed to be service on the Policy Owner

14.      Headings and Interpretation

14.1     The subject headings are for information only and do not affect the
construction or effect of this Assignment

14.2     Words importing the masculine gender only include the feminine gender
and words importing the singular number may include the plural number and vice
versa

14.3     Words denoting or referring to a natural person shall include a
corporate body and vice versa

14.4     Any reference to a statute includes any amendment or re-enactment of
it for the time being in force and (where the context so admits or requires)
any antecedent statute amended or re-enacted by that statute and any statutory
instrument regulation or order deriving authority or validity therefrom





                                       13
<PAGE>   15
IN WITNESS whereof the Policy Owner has executed this Assignment as a deed on
the date shown in the Schedule

Signed and Delivered              )
by the said Horizon               )
Exploration Limited               )
in the presence of:-              )

Witness Name:
Address:

Occupation:

Signed and Delivered              )
by the said                       )
                                  )
in the presence of:-              )

Witness Name:
Address:

Occupation:





                                       14

<PAGE>   1

                                                                   EXHIBIT 10.54





                          HORIZON EXPLORATION LIMITED
                              WAREHOUSE, KENT, UK
<PAGE>   2
                            DATED 12TH DECEMBER 1995





                            NEWINGTON BRICKS LIMITED


                                    - and -


                          HORIZON EXPLORATION LIMITED





                                   L E A S E

                                       of
                                   Units G5/6
                                off London Road
                                   Newington
                                 Sittingbourne
                                      Kent





                                Coole & Haddock
                                   14 Carfax
                                    Horsham
                                  West Sussex
                                    RH12 1DZ
<PAGE>   3
THIS LEASE made the 12th day of December One thousand nine hundred and
ninety-five BETWEEN NEWINGTON BRICKS LIMITED whose registered office is at
London Road Newington Kent ME9 7NU (hereinafter called "the Landlord") which
expression shall where the context so admits include the person and/or Company
for the time being entitled to the reversion immediately expectant on the
determination of the term hereby created of the first part and HORIZON
EXPLORATION LIMITED whose registered office is at 6 Pembroke Road Sevenoaks in
the County of Kent TN13 1XR (hereinafter called "the Tenant" which expression
shall where the context so admits include its successors in title) of the other
part WITNESSETH as follows:-

1.       IN consideration of the rent hereinafter reserved and of the covenants
on the part of the Tenant hereinafter contained the Landlord hereby demises
unto the Tenant ALL THAT land and buildings situate and known as Units G5/6
(hereinafter called "the Demised Premises") on part of the Landlord's estate
(hereinafter called "the Estate") situate off London Road Newington
Sittingbourne in the County of Kent such land and buildings for the purpose of
identification only shown on the plan attached hereto and thereon coloured red
TOGETHER WITH

(a)      (subject to the proviso hereinafter contained) a right of way (in
         common with all others entitled to the like right) and at all times
         (subject as hereinafter provided) and for all purposes with or without
         motor vehicles to pass and repass over and along the roadway which is
         coloured blue on the said plan and giving access to and egress from
         the Demised Premises to the point where such roadway joins with the
         public highway PROVIDED THAT and it is hereby declared that access to
         the Demised Premises outside normal working hours of 6 a.m. to 6 p.m.
         Monday to Friday and at 6 a.m. to 1 p.m. Saturdays excluding Bank and
         Public Holidays shall only be permitted by entry to the site via the
<PAGE>   4
         Landlord's security barrier in accordance with such instructions to
         operate the security barrier as may be issued from time to time by the
         Landlord or their duly authorised Agents Individual security code
         numbers shall be issued when the Landlord considers apposite giving
         unto the Tenant not less than 24 hours notice of any change of its
         security number unless in cases of emergency when no notice shall be
         given such number to be kept private and confidential by the Tenant
         who shall not communicate it without the Landlord's consent AND ALSO
         PROVIDED THAT the Tenant's employees and accredited agents shall not
         leave any vehicles on the site access road particularly (but not
         exclusively) in the vicinity of the security barrier and the A2 trunk
         road

(b)      a right to the free and uninterrupted passage and running (subject to
         temporary interruption for repair alteration or replacement) of water
         soil gas electricity telephone and other services by and through the
         sewers drains septic tanks pipes cables apparatus and wires serving
         the Demised Premises now or hereafter to be constructed within eighty
         years from the date hereof (and which shall be the perpetuity period
         for the purpose of this demise) in under or belonging to the land
         included in the Estate together with full liberty and power at all
         times (but on reasonable notice except in the case of emergency) for
         the Tenant with or without workmen or others together where necessary
         with appliances to enter upon the Estate to inspect construct maintain
         repair amend or renew the same doing no unnecessary damage by the
         exercise of this right and forthwith making good any damage thereby
         occasioned

(c)      subject to the proviso hereinafter contained pedestrian access to the
         Demised Premises at all times provided that the Tenant its employees
         and accredited agents with its licence





                                       2
<PAGE>   5
         shall conduct himself/themselves in a quiet and peaceful manner at all
         times so that no disturbance or nuisance is caused

(d)      the right of support and protection for the benefit of the Demised
         Premises as is now enjoyed from all other parts of the building of
         which the Demised Premises form part (hereinafter called "the
         Building")

(e)      a right of way on foot only for the Tenant its employees and
         accredited agents over the land coloured orange on the plan annexed
         hereto for access to and egress from the Landlord's toilet block (and
         the reasonable use thereof) coloured green on the said plan

(f)      The right to park three motor cars in the car parking area within the
         Estate to be designated by the Landlord from time to time

EXCEPTING AND RESERVING unto the Landlord:-

(A)      The free and uninterrupted passage and running of water soil gas
         electricity telephone and other services to and from the other parts
         of the Estate and the Adjoining Property (which shall mean any
         neighbouring or adjoining land or premises in which the Landlord or a
         group Company has a freehold or leasehold interest or in which during
         the Term the Landlord or a group Company shall have acquired a
         freehold or leasehold interest) over through and along the sewers
         drains pipes wires cables which now are or may hereafter during the
         term hereby granted be in under or upon the Demised Premises with a
         right for the Landlord to enter upon the Demised Premises at any time
         upon reasonable notice (except in the case of emergency) for the
         purpose of repairing cleansing maintaining and renewing the said
         sewers drains pipes wires and cables subject to the Landlord making





                                       3
<PAGE>   6
         good all damage caused by such entry as soon as reasonably practicable
         except in so far as such entry may be necessitated by any act or
         default of the Tenant

(B)      The right to erect scaffolding for the purpose of inspecting repairing
         or cleaning the Building or any other Buildings now or after the date
         of this Lease during the Term on the Estate and the Adjoining Property
         (hereinafter called "the Other Buildings") Provided that there shall
         not be erected any scaffolding or other structures in such a position
         so as to prevent access to the Demised Premises and that any
         disruption to use and enjoyment is kept to a minimum

(C)      The right to construct and to maintain in or under or over the Demised
         Premises at any time during the Term any pipes (meaning any pipes
         sewers drains mains ducts conduits gutters water courses wires cables
         channels flues and all other conducting media and including any
         fixings louvres cowls and any other ancillary apparatus)

(D)      The right at any time during the term or at reasonable times and upon
         reasonable notice except in cases of emergency to enter (or in case of
         emergency to break and enter) the Demised Premises

         (a)     to inspect the condition and state of repair of the Demised 
                 Premises

         (b)     to inspect cleanse connect to repair remove replace with
                 others alter and execute any works whatever to or in
                 connection with the pipes easements or services referred to

         (c)     to view the state and condition of and repair and maintain the
                 building of which the Demised Premises forms part ("the
                 Building") and the Other Buildings (being





                                       4
<PAGE>   7
                 any other buildings on the Estate) where such viewing or work 
                 would not otherwise be practicable

         (d)     to carry out work or do anything whatever comprised within the
                 Landlord's obligations of this Lease

         (e)     to take schedules of inventories fixtures and the items to be
                 yielded up on the expiry of the Term

         (f)     to exercise any of the rights granted to the Landlord by this
                 Lease

(E)      The right with the Landlord's Surveyor and anyone else authorised by
         the Landlord for all purposes in connection with the rent review
         provisions hereinafter contained or the Landlord and Tenant Act 1954
         including any statutory extension or modification or amendment or
         restraint of such statute and any regulations and orders made under
         such statute at any time to enter and inspect the Demised Premises

(F)      The rights of light and support shelter protection and all other
         easements and rights now or after the date of this Lease belonging to
         or enjoyed by other parts of the Building the Other Buildings and the
         Adjoining Property (being any land owned by the Landlord adjacent to
         the Estate)

(G)      Full right and liberty at any time after the date of this Lease

         (a)     to either raise the height of or rebuild the other parts of
                 the Building any of the Other Buildings or any building on the
                 Adjoining Property

         (b)     to erect any new buildings of any height on the Estate or on
                 the Adjoining Property in such manner as it shall think fit
                 notwithstanding the fact that the same may obstruct affect or
                 interfere with the amenity of or access to the Demised





                                       5
<PAGE>   8
                Premises or the passage of light and air to the Demised Premises
                but not so as to restrict access

TO HOLD the same unto the Tenant for the term of four years from the 12th day
of December 1995 (hereinbefore and hereinafter called the Term) PAYING THEREFOR
unto the Landlord:-

(1)      During the Term the yearly rent of SEVEN THOUSAND TWO HUNDRED POUNDS
         (L.7,200.00) and Value Added Tax to be payable by the Tenant by equal
         quarterly payments in advance on the first day of the months of
         January April July and October in every year without deduction the
         first payment to be made on the signing hereof

(2)      By way of further additional rent on the dates as set out in (1) above
         following demand the cost incurred by the Landlord in insuring the
         Demised Premises in the full reinstatement value thereof together with
         professional fees and loss of rent for at least two years against fire
         storm damage impact with vehicles site and debris clearance and other
         such risks as may be determined at the Landlord's absolute discretion
         including third party liability of the Landlord ("the Insured Risks")

PROVIDED ALWAYS that the Tenant shall not be entitled to any right of access of
light or air to the Demised Premises which would restrict or interfere with the
free user of the other land on the Estate or the Adjoining Property for
building or any other purpose

2.       THE Tenant hereby covenants with the Landlord as follows:-

(1)      To pay the said rents hereinbefore reserved to the Landlord at the
         time and in manner aforesaid clear of all deductions

(2)      To pay all rates taxes charges assessments outgoings and impositions
         whatsoever which now are or shall at any time hereafter during the
         Term be charged assessed or imposed





                                       6
<PAGE>   9
         upon or in respect of the Demised Premises or any part thereof or on
         the Landlord or Tenant in respect thereof and all payments for water
         supplied to the Demised Premises by the Landlord in accordance with
         the provisions of Clause 4(3) hereof

(3)      To pay in addition to the rents and other sums hereby reserved and
         otherwise made payable under this Lease to the Landlord Value Added
         Tax at the standard or other appropriate rate (if applicable) in
         respect of all supplies made or deemed to be made by the Landlord to
         the Tenant pursuant to this Lease or in respect of the Demised
         Premises whether such supply is taxable because of an election made by
         the Landlord (whether under Paragraph 2 of Schedule 6 (A) to the Value
         Added Tax Act 1983) or otherwise or for any other reason

"Value Added Tax" means Value Added Tax as provided for in the Value Added Tax
Act 1983 and legislation (delegated or otherwise) supplemental thereto and any
similar tax replacing or introduced in addition to the same

(4)      (a)     At all times to keep the exterior and interior of the Demised
         Premises and all additions thereto and the appurtenances thereof
         including the roof and walls and the passages doors plate glass and
         other windows fixtures fittings fastenings wires waste water drain and
         other pipes and sanitary and water apparatus therein and the painting
         papering and decoration thereof in good and substantial repair and
         condition throughout the Term (damage by Insured Risks and such other
         risk against which the Landlord shall have insured save where the
         insurance moneys shall be irrecoverable in consequence of any act or
         default of the Tenant only excepted) and to renew and replace from
         time to time all Landlord's fixtures and fittings as set out in the
         First Schedule hereto and appurtenances





                                       7
<PAGE>   10
         in the Demised Premises which may become or be beyond repair at any
         time during or at the expiration or sooner determination of the Term
         And without prejudice to the generality of the foregoing covenants (i)
         to clean the interior and exterior of all plate glass and other
         windows in the Demised Premises at least once in every month (ii)
         generally to keep any forecourt yard or other open areas in a clean
         and tidy condition (iii) at the Tenant's sole expense to clear and
         unblock the drains and sanitary apparatus exclusively serving the
         Demised Premises unless (but only in the case where the same are used
         in common by neighbouring tenants of the Landlord) stoppage thereof
         has not been occasioned by any act or default on his part or on the
         part of his servants invitees or licensees PROVIDED THAT nothing
         herein contained shall require the Tenant to put the Demised Premises
         into any better condition than that in which they are at the date
         hereof (as evidenced by the Schedule of Condition annexed hereto) save
         for where repairs or renewals are undertaken and the proviso shall not
         relate to decoration

         (b)     In the last year of the Term (howsoever determined) to paint
                 in a proper and workmanlike manner all inside wood and iron
                 work and other parts heretofore or usually painted of the
                 Demised Premises with two coats at least of good and suitable
                 quality paint (as shall first be approved by the Landlord as
                 to both quality and colour (such approval not to be
                 unreasonably withheld or delayed)) and also with every such
                 internal painting to wash stop whiten emulsion grain varnish
                 colour paper and otherwise decorate in manner aforesaid all
                 such internal parts of the Demised Premises that have been or
                 ought properly to be so treated (the colours and patterns of
                 all such works first to be approved by the Landlord (such





                                       8
<PAGE>   11
                 approval not to be unreasonably withheld or delayed)) And also
                 in the last year of the Term (howsoever determined) to paint
                 with three coats at least of good and suitable quality paint
                 (as shall first be approved by the Landlord as to both quality
                 and colour (such approval not to be unreasonably withheld or
                 delayed)) in a proper and workmanlike manner all outside parts
                 of the Demised Premises heretofore or usually painted and any
                 additions thereto and with every such external painting to
                 point grain varnish creosote and restore all outside brick
                 cement wood iron and rough-cast work

         (c)     To pay a fair proportion to be determined by the Surveyor for 
                 the time being of the Landlord whose determination shall be
                 binding upon the Tenant of the expenses payable in respect of
                 constructing repairing rebuilding maintaining and cleansing
                 all party walls party fences party staircases and all such
                 other appurtenances whatsoever the use of which is common to
                 the Demised Premises and to the Building or to any other
                 premises
        
(5)      To permit the Landlord or the Landlord's duly authorised agents at all
         reasonable times during the Term with or without workmen or others
         upon giving one week's previous notice to enter upon the Demised
         Premises or any part thereof to view the state of repair and condition
         thereof and to give or leave on the Demised Premises notice in writing
         addressed to the Tenant of all defects and wants of reparation then
         and there found and the Tenant shall within a period of three calendar
         months after such notice or sooner if requisite repair and make good
         the same according to such notice and the covenant in that behalf
         hereinbefore contained and if the Tenant shall fail so to do the
         Tenant shall permit





                                       9
<PAGE>   12
         the Landlord to enter upon the Demised Premises for the purpose of
         carrying out such repairs and the cost thereof shall be repaid by the
         Tenant to the Landlord

(6)      To permit the Landlord or the Landlord's duly authorised agents with
         or without workmen or others at all reasonable times during the Term
         to enter upon the Demised Premises or any part thereof for the
         purposes of carrying out repairs to the other parts of the Estate and
         the Adjoining Property making good all damage to the Demised Premises
         caused thereby PROVIDED that except in case of emergency the Landlord
         shall give not less than forty eight hours notice of his intention to
         exercise this right

(7)      Not at any time during the Term without the consent in writing of the
         Landlord such consent not to be unreasonably withheld to make any
         alterations or additions to the Demised Premises or any part thereof
         and in any event not to affix any machinery or addition to the walls
         or roof thereof

(8)      Not to use or permit to be used that part of the Demised Premises
         coloured red on the said plan for the purpose other than storage or
         workshop together with ancillary offices but excluding any trade
         associated directly or indirectly with motor vehicles or recovery of
         waste products or scrap metal

(9)      Not to do or permit or suffer to be done anything whereby the policy
         or policies of insurance on the Demised Premises or on any building or
         part of a building or the contents thereof adjoining or near the
         Demised Premises against the risks included in such policy or policies
         of insurance may become void or voidable or whereby the rate of
         premium quoted by a tariff insurance company in London may be
         increased to a rate higher than usually charged in respect of the
         trade carried on in such adjoining or





                                       10
<PAGE>   13
         neighbouring buildings and to repay to the Landlord all sums paid by
         way of increased premium and all expenses incurred by it in or about
         the renewal of any such policy or policies rendered necessary by a
         breach of this covenant and all such payments shall be added to the
         rents hereinbefore reserved and be recoverable as rent

(10)     In the event of the Demised Premises or the Estate or the Adjoining
         Property or any part thereof being damaged or destroyed by fire or any
         other of the insured risks at any time during the Term and the
         insurance moneys under any policy of insurance effected thereon by the
         Landlord being wholly or partially irrecoverable by reason solely or
         in part of any act or default of the Tenant the Tenant will forthwith
         (in addition to the said rents) pay to the Landlord the whole or (as
         the case may be) a fair proportion of the cost of rebuilding and
         reinstating the same any dispute as to the proportion to be so
         contributed by the Tenant to be referred to arbitration in accordance
         with the provisions of the Arbitration Act 1950 or any statutory
         modification or re-enactment thereof for the time being in force

(11)     To comply at all times during the Term with all statutory and other
         requirements for ensuring the health and safety and welfare of the
         persons using or employed in or about the Demised Premises or any part
         thereof

(12)     Not to use or permit or suffer to be used the Demised Premises or any
         part thereof for any illegal or immoral purpose and not to do or cause
         or permit or suffer to be done on the Demised Premises or any part
         thereof anything which may be or become a nuisance or annoyance or
         which may cause damage to the Landlord or to the occupiers for the
         time





                                       11
<PAGE>   14
         being of any other part of the Estate and in particular not to use any
         fireplace or furnace for burning any refuse or to emit any smoke or
         noxious fumes

(13)     Throughout the Term so far as in him lies to preserve unobstructed and
         undefeated all rights of light and other easements appertaining to the
         Demised Premises in any way and at all times to afford to the Landlord
         such facilities and assistance as may enable the Landlord to prevent
         the acquisition by anyone of any right of light or other easement over
         the Demised Premises or any part thereof

(14)     Not to erect or display or permit to be erected or displayed without
         the consent in writing of the Landlord (such consent not to be
         unreasonably withheld and delayed) any advertisements hoardings or
         notices (whether illuminated or otherwise) upon the exterior of the
         Demised Premises or any part thereof or upon any interior part of the
         Demised Premises which shall be visible from the exterior thereof

(15)     Not to underlet or otherwise part with the possession of the Demised
         Premises or any part thereof except by way of assignment in accordance
         with the next succeeding sub-clause

(16)     (a)     Not to assign the Demised Premises during the Term other than
                 in their entirety and in any event not to assign the same
                 without the consent in writing of the Landlord and the Local
                 Planning Authority first had and obtained (such consent not to
                 be unreasonably withheld or delayed by the Landlord) and
                 within one calendar month after any assignment whatsoever
                 (otherwise than by way of mortgage) to give to the Landlord
                 notice thereof in writing containing the name and address of
                 the assignee or assignees and to produce to the Landlord the





                                       12
<PAGE>   15
                 instrument of assignment and pay a registration fee of not 
                 less than Ten pounds plus value added tax

         (b)     The Landlord shall not be required to consent to an assignment
                 to a private limited company unless the director or directors
                 of such company being respectable and responsible persons
                 proved to be such by the Tenant join in the licence to assign
                 or the assignment as sureties for such a company and jointly
                 and severally covenant with the Landlord to pay the rent
                 hereby reserved and any damages and costs properly accruing to
                 the Landlord by reason of the failure of such company to
                 observe and perform the covenants on the part of the Tenant
                 and conditions herein contained and such further covenants as
                 the Landlord may reasonably require

(17)     During the last six months of the Term to permit the Landlord to affix
         to any part of the Demised Premises and thereto retain without
         interference to the Tenant's business or use of the Demised Premises a
         notice that the same are to let and to permit all persons bearing
         written authority from the Landlord to enter upon the Demised Premises
         to inspect the same at all reasonable times of the day and by
         appointment

(18)     Not in any way to obscure or permit to be obscured the windows of the
         Demised Premises

(19)     Not at any time during the Term to cause any damage to or obstruction
         in such parts of the Estate as are used by the Tenant in common with
         the Landlord or any other persons similarly entitled and in particular
         but without prejudice to the generality of the foregoing





                                       13
<PAGE>   16
         provision to make adequate arrangements for the frequent removal from
         the Estate of all trade refuse

(20)     At all times during the Term to comply with the rules and regulations
         for the efficient running of the Estate as are specified in the Third
         Schedule hereto PROVIDED ALWAYS that the Landlord shall have the right
         to revise and extend such rules and regulations from time to time as
         may reasonably be required on giving to the Tenant four weeks prior
         written notice of its intention to do so

(21)     To pay all proper and reasonable expenses (including Solicitors' costs
         and Surveyors' fees) incurred by the Landlord incidental to the
         preparation and service of a notice under Section 146 of the Law of
         Property Act 1925 notwithstanding forfeiture is avoided otherwise than
         by relief granted by the Court

(22)     To keep the Demised Premises sufficiently supplied and equipped with
         fire fighting and extinguishing appliances as reasonably required from
         time to time by the authorities concerned which shall be open to
         inspection and maintained to the reasonable satisfaction of the
         Landlord and also not to obstruct or permit or suffer to be obstructed
         the access to or means of working such apparatus and appliances or the
         means of escape from the Demised Premises or the Estate

(23)     To pay the proper and reasonable legal costs incurred by the Landlord
         and of any renewal or extension hereof and of any licence or consent
         required hereunder and to pay the Stamp duty thereon





                                       14
<PAGE>   17
(24)     At the end or sooner determination of the Term to yield up the Demised
         Premises to the Landlord in the state of repair in which they ought to
         be having regard to the provisions hereinbefore contained

(25)     Not without the previous written consent of the Landlord (such consent
         not to be unreasonably withheld or delayed) to make any application
         under the Town and Country Planning Acts for any permission or
         consents thereunder in respect of the Demised Premises

(26)     Within seven days of receipt of notice of the same to give full
         particulars to the Landlord of any permission notice order or proposal
         for a notice or order made or given or issued to the Tenant by any
         Government Department Local or Public Authority under or by virtue of
         any statutory powers and if so required by the Landlord to produce
         such permission notice order or proposal for a notice or order to the
         Landlord and also without delay to take all reasonable or necessary
         steps to comply with any such notice or order and also at the request
         of the Landlord to make or join with the Landlord and any other
         persons for the time being interested in the Demised Premises in
         making such objections or representations against or in respect of any
         such notice order or proposal as aforesaid as the Landlord shall deem
         expedient

(27)     In case any dispute shall arise between the Tenant and the tenants or
         occupiers or owners of any neighbouring premises the Landlord if it
         shall think fit shall determine any such dispute on the part of the
         Tenant in such manner as the Landlord shall think reasonable and shall
         by writing under its hand order and the Tenant will submit to and
         abide by every such determination





                                       15
<PAGE>   18
(28)     Not to keep or permit to be kept or deposit for sale or otherwise in
         or upon the Demised Premises any goods of a dangerous hazardous or
         especially combustible nature nor any materials of any nature the
         keeping of which may contravene any statute or local regulation or
         bye-law or constitute a nuisance or annoyance to the owners or
         occupiers of adjoining or neighbouring property nor without prejudice
         to the generality of the foregoing to erect any stove fire engine flue
         or chimney whatever without the written consent of the Landlord and in
         the event of the Demised Premises or any adjoining premises of the
         Landlord being wholly or partly destroyed or injured by any act or
         default of the Tenant whereby the Landlord's policy or policies of
         insurance thereon shall be vitiated the Tenant shall pay to the
         Landlord the cost of rebuilding or reinstating the same and the amount
         of such costs may be distrained for as if the same were rent in arrear

(29)     To indemnify and keep indemnified the Landlord from and against all
         and every claim either from tenants of other parts of the Estate or of
         the Adjoining Property or from any other person arising in connection
         with the use and occupation of the Demised Premises by the Tenant and
         against all damage caused to any other part of the Estate or to the
         Adjoining Property by negligence or default of the Tenant or the
         Tenant's servants or agents

(30)     Without prejudice to any other rights or remedies of the Landlord to
         pay interest on any rent or rents hereinbefore reserved or any other
         payments due from the Tenant to the Landlord under the terms hereof at
         the rate of Four per cent above base rate of Midland Bank Plc for the
         time being which shall be in arrears for the period of twenty one days





                                       16
<PAGE>   19
         or more such interest to run from the date upon which the said rents
         or other payments become due or payable as aforesaid

(31)     At all times to display and maintain a suitable sign showing the
         Tenant's trading name and business of a size and kind first approved
         by the Landlord at a point to be specified by the Landlord (such
         approval not to be unreasonably withheld or delayed)

(32)     Not to cease carrying on in business in the Demised Premises (or leave
         the Demised Premises continuously unoccupied for more than one month)
         without:

(a)      notifying the Landlord and

(b)      providing such caretaking or security arrangements as the Landlord
         shall reasonably require and the insurers shall require in order to
         protect the Demised Premises from vandalism theft damage or unlawful
         occupation and provided the Tenant pays any additional insurance
         premium

(33)     Not to unload any goods or materials from vehicles and convey them
         into the Demised Premises except through the approved entrances
         provided for the purpose and not to cause congestion of adjoining
         parking areas or inconvenience to any other user of them

(34)     Not to permit any vehicles belonging to the Tenant or any persons
         calling on the Demised Premises expressly or by implication with the
         authority of the Tenant to stand on the Estate roads or the pavements
         of them and to use its best endeavours to ensure that such persons
         shall not permit any vehicle to stand on any such road or pavement

(35)     Not to place on the Estate or any part thereof or expose on the same
         for sale any goods or things whatsoever





                                       17
<PAGE>   20
(36)     Not to commit any breach of planning control (such term to be
         construed as it is used in the Planning Acts) and to comply with the
         provisions and requirements of the Planning Acts that affect the
         Demised Premises whether as to the permitted user or otherwise and to
         indemnify both during or following the expiration of the Term and keep
         the Landlord indemnified against all liability whatsoever including
         the reasonable costs and expenses in respect of any contravention

(37)     Not to allow dogs to roam the Estate and any dogs on the Estate must
         be kept on a lead

(38)     Not to allow children upon the Estate unless under constant
         supervision of a responsible adult

3.       THE Landlord hereby covenants with the Tenant as follows:-

(1)      Throughout the Term to keep the Demised Premises insured against loss
         or damage by fire and the Insured Risks in the full reinstatement
         value thereof together with two years loss of rent subject to such
         limitations that may from time to time be imposed by the Insurers and
         produce to the Tenant a copy of such policy within 14 days of a
         request

(2)      That the Tenant paying the rents hereinbefore reserved and performing
         and observing the several covenants conditions and agreements herein
         contained and on its part to be performed and observed may peaceably
         hold and enjoy the Demised Premises during the Term without any
         interruption or disturbance from the Landlord or any person or persons
         lawfully claiming under or in trust for the Landlord

4.       PROVIDED ALWAYS and it is hereby agreed and declared as follows:-

(1)      That if the rents hereinbefore reserved or any part thereof shall at
         any time be in arrear and unpaid for twenty one days after the same
         shall have become due (whether legally





                                       18
<PAGE>   21
         demanded or not) or if the Tenant shall at any time fail or neglect to
         perform or observe any of the covenants or agreements herein contained
         and on the Tenant's part to be performed and observed or if the Tenant
         for the time being shall become bankrupt or being a company shall
         enter into liquidation whether compulsory or voluntary (other than for
         the purpose of reconstruction or amalgamation) or if the Tenant for
         the time being shall enter into any arrangement or composition for the
         benefit of the Tenant's creditors or shall suffer any distress or
         execution to be levied on the Tenant's goods then and in any such case
         it shall be lawful for the Landlord or any person or persons duly
         authorised by the Landlord in that behalf to re-enter into and upon
         the Demised Premises or any part thereof in the name of the whole and
         thereupon this demise shall absolutely determine but without prejudice
         to any right of action or remedy of the Landlord in respect of any
         antecedent breach by the Tenant of any of the covenants or agreements
         herein contained

(2)      That if and so often as the Demised Premises shall be destroyed or
         damaged by fire or an Insured Risk (not caused by the wilful act or
         default of the Tenant) so as to become unfit for occupation or use for
         the purpose aforesaid the said rents or a just and proportionate part
         thereof according to the nature and extent of the damage sustained
         shall abate from the time of the destruction or damage until such time
         as the Demised Premises shall be rebuilt and reinstated or until the
         date of expiry of a notice of election by the Landlord under the
         proviso hereinafter contained PROVIDED FURTHER and it is a condition
         of this Lease that if through any cause whatsoever the Demised
         Premises shall be destroyed or so damaged as to become unfit for
         occupation or use for the purpose aforesaid without substantial
         rebuilding the Landlord may at the Landlord's discretion in





                                       19
<PAGE>   22
         lieu of rebuilding or reinstating the same elect to treat this Lease
         as at an end and re-enter upon the Demised Premises upon giving to the
         Tenant not less than one month's notice in writing of such election by
         the Landlord

(3)      The Landlord has at the request of the Tenant made available a supply
         of water to a point within the Demised Premises such supply being made
         under the same terms and conditions as those then currently issued by
         the Water Authority or any such subsequent Authority that may be
         appointed such water supply shall be metered by the Landlord at the
         point of supply the Tenant paying unto the Landlord within fourteen
         days of notification the then current rate as charged by the Water
         Authority for a water supply and water consumed as registered on the
         Landlord's water meter

(4)      The demise hereby made shall not be deemed to include and shall not
         operate to convey or demise any ways watercourses sewers drains lights
         liberties privileges easements rights or advantages whatsoever in
         through over or upon the other Land on the Estate or on the Adjoining
         Property other than the rights hereinbefore specifically demised AND
         the Landlord shall have power at all times without obtaining any
         consent from or making any compensation to the Tenant to deal as the
         Landlord may think fit with the other land on the Estate or on the
         Adjoining Property and to erect or suffer to be erected on the other
         land on the Estate or on the Adjoining Property any buildings
         whatsoever whether such buildings shall or shall not affect or
         diminish the light or air which may now or at any time or times during
         the Term be enjoyed by the Landlord or the other tenants or occupiers
         of the Demised Premises or any part thereof





                                       20
<PAGE>   23
(5)      Nothing in this lease or in any consent granted by the Landlord under
         this lease shall imply or warrant that the Demised Premises may
         lawfully be used under the Planning Acts for the purpose authorised in
         this lease (or any purpose subsequently authorised)

(6)      This lease embodies the entire understanding of the parties relating
         to the Demised Premises and to all the matters dealt with by any of
         the provisions of this lease

(7)      The Tenant acknowledges that this lease has not been entered into in
         reliance wholly or part on any statement or representation made by or
         on behalf of the Landlord except any such statement or representation
         that is expressly set out in this lease

(8)      Whilst the Landlord is a limited company or other corporation all
         licences consents approvals and notices required to be given by the
         Landlord shall be sufficiently given if given under the hand of a
         director the secretary or other duly authorised officer of the
         Landlord

(9)      If after the Tenant has vacated the Demised Premises on the expiry of
         the Term any property of the Tenant remains in or on the Premises and
         the Tenant fails to remove it within 7 days after being requested in
         writing by the Landlord to do so or if after using its best endeavours
         the Landlord is unable to make such a request to the Tenant within 14
         days from the first attempt so made by the Landlord:

         (a)     the Landlord may as the agent of the Tenant sell such property
                 and the Tenant will indemnify the Landlord against any
                 liability incurred by it to any third party whose property
                 shall have been sold by the Landlord in the mistaken belief
                 held in good faith (which shall be presumed unless the
                 contrary be proved) that such property belonged to the Tenant





                                       21
<PAGE>   24
         (b)     if the Landlord having made reasonable efforts is unable to
                 locate the Tenant the Landlord shall be entitled to retain
                 such proceeds of sale absolutely unless the Tenant shall claim
                 them within 3 months of the date upon which the Tenant vacated
                 the Premises and

         (c)     the Tenant shall indemnify the Landlord against any damage
                 occasioned to the Premises and any actions claims proceedings
                 costs expenses and demands made against the Landlord caused by
                 or related to the presence of the property in or on the
                 Premises

(10)     Any statutory right of the Tenant to claim compensation from the
         Landlord on vacating the Premises shall be excluded to the extent that
         the law allows

(11)     The provisions of the Law of Property Act 1925 Section 196 as amended
         by the Recorded Delivery Service Act 1962 shall apply to the giving
         and service of all notices and documents under or in connection with
         this lease except that Section 196 shall be deemed to be amended as
         follows:-

         (a)     the final words of Section 196(4) "and that service be
                 delivered" shall be deleted and there shall be substituted
                 "and that service shall be deemed to be made on the third
                 Working Day after the registered letter has been posted"
                 "Working Day" meaning any day from Monday to Friday
                 (inclusive) other than Christmas Day Good Friday and any
                 statutory bank or public holiday

         (b)     any notice or document shall also be sufficiently served if
                 sent by telex telephone facsimile transmission or any other
                 means of electronic transmission to the party to be served and
                 that service shall be deemed to be made on the day of





                                       22
<PAGE>   25
                 transmission if transmitted before 4 p.m. on a Working Day but
                 otherwise on the next following Working Day (as defined above)

5.       THE Tenant hereby warrants that prior to the execution of this Lease
it has disclosed to the Landlord in writing any conviction judgment or finding
of any Court or Tribunal relating to the Tenant (or any Director other Officer
or major shareholder of the Tenant) of such nature as to be likely to affect
the decision of any insurer to grant or to continue insurance of the Estate
against loss or damage by any of the insured risks

6.       We certify that there is no Agreement for Lease to which this lease
gives effect 

         IN WITNESS whereof the parties hereto have executed this Deed the 
day and year first before written

                     THE FIRST SCHEDULE before referred to

                             Landlord's Fixtures

1 no mains isolator

1 no fuse board

2 no junction boxes

7 no switch fuse boxes

12 no power sockets 13 amp

3 no 8' double fluorescent

8 no 4' double fluorescent

1 no trip box

1 no standpipe - water

Floor size 30' x 30' mezzanine floor





                                       23
<PAGE>   26
                     THE SECOND SCHEDULE before referred to

                                  Regulations

 1.      The Tenant shall be held liable for any proven misuse or negligence of
the foul sewers (usage restricted to normal domestic effluent) with such costs
incurred by the Landlord through the Tenant's misuse or negligence being
recoverable from the Tenant

2.       In no event shall the Tenant the Tenant's servants employees agents or
invitees park vehicles within the curtilage of the Estate other than on
allotted parking bays as specified by the Landlord 3.       The Tenant shall
confine all its activities and the storage of waste and materials to within the
confines of the Demised Premises

4.       There shall be a maximum speed limit of twenty miles per hour on the
whole of the Estate which must be observed by all users of motor vehicles

5.       The Tenant shall comply with vehicles direction requirements in
respect of the access road

                     THE THIRD SCHEDULE before referred to

                           Alterations and Additions

1.       If the Tenant shall desire to make any alteration or addition to the
Demised Premises it shall deliver to the Landlord plans and specifications of
such proposed alterations or addition for approval by the Landlord's surveyor
(such approval not to be unreasonably withheld or delayed) in respect of
buildings or equipment reasonably required for the carrying out of the use
permitted by this Lease (hereinafter called "the Works")

2.       In the event that such approval shall be given in writing by the
Landlord or its Surveyor and before commencing the Works the Tenant will:-





                                       24
<PAGE>   27
(a)      at the expense of the Tenant obtain all necessary permissions and any
         other consents required for the carrying out of the Works from the
         relevant planning and other competent authorities under the Planning
         Acts and any other applicable statute and from the insurers and any
         other persons interested in the Premises and to deliver copies of the
         same to the Landlord

(b)      obtain the approval in writing of the Landlord to any planning
         permission granted in respect of the Works such approvals not to be
         unreasonably withheld Provided That the Landlord may refuse to approve
         such planning permission on the grounds that any condition contained
         in it or anything omitted from it or the period referred to in it
         would in the reasonable opinion of the Landlord be or be likely to be
         prejudicial to the interest of the Landlord in the Premises or in any
         adjoining property whether during or following the expiration of the
         respective terms granted by the Lease

3.       The Tenant shall thereafter:-

(a)      give written notice to the Landlord of the commencement of the Works
         and immediately they have been completed

(b)      give written notice to the insurers of the Demised Premises of the
         commencement of the Works and to deliver a copy of such notice to the
         Landlord and to pay any increased or extra premium payable in
         consequence of the Works or the execution thereof and to comply with
         the requirements of such insurers

(c)      comply with the terms and conditions laid down by the Institution of
         Electrical Engineers and with the regulations of the electricity
         supply authority insofar as any of the Works relate to alterations or
         additions to the electrical installation in the Demised Premises





                                       25
<PAGE>   28
(d)      procure that the Works are undertaken by reputable contractors and in
         accordance with current codes of building practice

(e)      carry out and complete the Works:-

         (i)     in a good and workmanlike manner with the best quality
                 materials of their several kinds

         (ii)    in compliance with all permissions consents licences and
                 approvals required to be obtained for the Works and in
                 accordance with the Planning Acts and any other applicable
                 statute

         (iii)   in accordance with the plan and specification

         (iv)    to the satisfaction of the Landlord and its surveyor or
                 architect who shall have all necessary facilities for
                 inspecting the progress of the Works and the quality of the
                 materials and workmanship used therein

(f)      take all necessary steps to prevent the execution of the Works from
         causing any annoyance inconvenience nuisance or disturbance to the
         Landlord and the owners or occupiers of any adjoining or neighbouring
         premises

(g)      forthwith make good or procure the making good of all damage to any
         Adjoining Premises arising out of or incidental to the Works to the
         complete satisfaction of the Landlord

(h)      at the end or sooner determination of the Term (including the period
         of any holding over or any extension or continuance whether by statute
         or common law) and if required to do so by the Landlord reinstate the
         Demised Premises and restore them to the same state and condition as
         they were prior to the execution of the Works such reinstatement and





                                       26
<PAGE>   29
         restoration to be carried out at the sole cost of the Tenant in a good
         and workmanlike manner with the best quality materials of their
         several kinds to the entire satisfaction of the Landlord and its
         surveyor or architect

(i)      indemnify and keep indemnified the Landlord against all actions claims
         demands charges costs fees and expenses and liability whatsoever
         arising directly or indirectly out of the execution and completion of
         the Works and the reinstatement of the Demised Premises or by reason
         of any act or default of the Tenant or any person under its control

(j)      pay all reasonable and proper costs charges fees and expenses and any
         value added tax thereon of the Landlord and its solicitor surveyor and
         architect arising out of or incidental to the approval of the plans
         specification and planning consent and inspection of the Works and the
         reinstatement and restoration of the Demised Premises

ORIGINAL

EXECUTED as a Deed by affixing the         )
Company Seal of NEWINGTON BRICKS           )
LIMITED in the presence of:-               )


                          Director  /s/ [illegible signature]





                          Secretary  /s/ [illegible signature]





                                       27
<PAGE>   30
                             SCHEDULE OF CONDITION
                    UNITS G5/G6 NEWINGTON INDUSTRIAL ESTATE

Background

The units measure approximately 30ft wide x 60ft deep with an eaves height of
around 15ft, and are two intermediate units out of a total of seven units.

The building was constructed about 50 years or so ago being part of a
brickmaking plant which ceased to operate in the late 1970s.

Between 1980 and 1985 the building was sub-divided into individual units by the
construction of 215m thick party walls party walls and the provision of
galvanised roller shutter doors to each unit with plywood infill panels above
the door.

Conditions

The metal corrugated barrel roof is in good condition having been renewed in
the early 1980s. The roof sheets have been painted with bituminous paint from
time to time, which is now showing signs of requiring repainting. No rust is
evident.

The brick party walls appear sound but the pointing is rough.

The rear wall comprises brickwork to about 2m height with an emergency exit
built within, and metal PVC coated cladding above to eaves height, all in good
condition.

The roller shutter door to front elevation has a wicket door and is in good
working order and condition. There is an infill panel of brick about 15" wide
with a metal personnel door housed within, the door being of average condition.

The door and fascia/window frame and joinery are in need of repainting although
there is no evidence of paint peeling.

The internal concrete floor has been parched from time to time and is sound but
only of average condition.

The mezzanine floor covers approximately half the ground floor area and is of a
light construction with limited loading capabilities and is not suitable for
use as a working area because of inadequate fire escape facility.

The electric circuits were overhauled in February 1994.

In general terms the building is in fair condition being mindful of its
history.

<PAGE>   1
                                                                   EXHIBIT 10.55





                          HORIZON EXPLORATION LIMITED
                           HEADOFFICE, SEVENOAKS, UK
<PAGE>   2
DATED                     25th AUGUST                                       1993
- --------------------------------------------------------------------------------




                         MARLEY WATERPROOFING LIMITED

                                      
                                    - to -
                                      



                         HORIZON EXPLORATION LIMITED




                             U N D E R L E A S E


                                 relating to
                       6 Pembroke Road  Sevenoaks  Kent





                            Thomson Snell & Passmore
                               3 Lonsdale Gardens
                                TUNBRIDGE WELLS
                                  Kent TN1 1NX
                                  259/0051/mb
<PAGE>   3
                                  PARTICULARS

- --------------------------------------------------------------------------------
1.       DATE                         :        25th August              1993
                                      
- --------------------------------------------------------------------------------
2.       THE PARTIES:

         A.      THE LANDLORD         :       MARLEY WATERPROOFING LIMITED 
                                              whose registered office is at
                                              London Road Riverhead
                                              Sevenoaks  Kent
                                              TN13 2DS 
- --------------------------------------------------------------------------------
         B.      THE TENANT           :       HORIZON EXPLORATION LIMITED 
                                              whose registered office is at 
                                              14-16 Mount Ephraim Road  
                                              Tunbridge Wells Kent  TN1 1EE 
- --------------------------------------------------------------------------------
3.    SHORT DESCRIPTION OF  
      THE PREMISES                    :       6 Pembroke Road  Sevenoaks
                                              Kent 
- --------------------------------------------------------------------------------
4.    THE TERM                        :       A term of seven years commencing
                                              on 25th AUGUST 1993 and expiring
                                              on 24th AUGUST 2000





                                     - 1 -
<PAGE>   4
5.       RENT                         :       L.120,000 per annum subject to
                                              review 

- --------------------------------------------------------------------------------
6.       RENT COMMENCEMENT DATE       :       25th AUGUST      1993

- --------------------------------------------------------------------------------
7.       PERMITTED USE                :       Offices

- --------------------------------------------------------------------------------
8.       SUPERIOR LEASE               :       The superior lease under which
                                              the Landlord holds the Premises 
                                              dated 20th December 1985 and made
                                              between Strathclyde Regional
                                              Council (1) ("the Superior
                                              Landlord") the Landlord (2) and
                                              The Marley Tile Company Limited
                                              (3) for a term of 25 years
                                              from 29th September 1985





                                     - 2 -
<PAGE>   5
T H I S  L E A S E made between the Parties named in the Particulars
W I T N E S S E S as follows:

1.       UNLESS the context otherwise requires the following expressions bear
         the meanings ascribed to them as follows:

1.1              "THE LANDLORD" includes the reversioner for the time being
                 immediately expectant upon the Term

1.2              "THE SUPERIOR LANDLORD" includes any person now or after the
                 date of this Lease having title to the Premises mediately or
                 immediately expectant on the termination of the Landlord's
                 title

1.3              "THE TENANT" includes the Tenant's successor in title 

1.4              "THE TERM" includes not only the term granted by this Lease 
                 but also the period of any holding over

1.5              "PLANNING ACTS" means the Town and Country Planning Act 1990
                 the Planning (Listed Buildings and Conservation Areas) Act
                 1990 the Planning (Hazardous Substances) act 1990 the Planning
                 (Consequential Provisions) Act 1990 and any similar or
                 amending legislation in force at any time during the Term

1.6              All references in this Lease to statutes statutory instruments
                 rules orders and regulations or the like include (unless
                 otherwise stated) any future re-enactments or modifications
                 thereof and those made in substitution or replacement of any
                 which are repealed and also include all instruments orders
                 plans regulations permissions and directions for the time
                 being made issued or given thereunder or deriving validity
                 therefrom





                                     - 3 -
<PAGE>   6
1.7              Words importing one gender include all other genders and words
                 importing the singular include the plural and vice versa

1.8              Where the Tenant consists of two or more persons all covenants
                 by the Tenant are deemed to be made by those persons jointly
                 and severally

1.9              Words importing persons include firms companies and
                 corporations and vice versa

1.10             Any provisions in this Lease referring to the consent
                 permission or approval of the Landlord shall be construed as
                 also requiring the consent approval or permission of any
                 Superior Landlord and any mortgagee of the Landlord and any
                 Superior Landlord if so required under the Superior Lease

1.11             (a)      All rights of entry or other rights or easements
                          exercisable by the Landlord shall extend to include
                          any Superior Landlord or persons authorised by them
                          and their respective surveyors servants contractors
                          licensees and work people with or without plant and
                          appliances and materials

                 (b)      All rights exercisable by the Tenant shall extend to
                          include all persons authorised by the Tenant and
                          their respective surveyors servants contractors
                          licensees and work people with or without plant and
                          appliances and materials

1.12             Any covenants by the Tenant not to do any act or thing are
                 deemed to include a covenant not to permit or suffer the doing
                 of that act or thing

2.       IN consideration of the rent and covenants hereinafter respectively
         reserved and contained and on the part of the Tenant to be
         respectively paid and performed the Landlord HEREBY DEMISES unto the
         Tenant ALL THAT





                                     - 4 -
<PAGE>   7
         premises shortly described in paragraph 3 of the Particulars and more
         particulary defined in the Schedule to the Superior Lease together
         with all additions and alterations thereto (hereinafter called "the
         Demised Premises") SUBJECT TO all covenants restrictions and
         stipulations of whatever kind which may affect or relate to the
         Demised Premises TO HOLD the same unto the Tenant from 25th AUGUST
         1993 for the term of seven years YIELDING AND PAYING therefor during
         the said term without any deduction:

2.1              firstly for the period from                25th AUGUST 1993 to
                 24th NOVEMBER                              1993 the rent of a
                 peppercorn and as from                     25th NOVEMBER 1993

                 the yearly rent of L.120,000 or such substituted rent as may
                 become payable under the rent review provisions in clause 6 of
                 this Lease payable in advance on the usual quarter days (such
                 payments if required by the Landlord to be made direct to the
                 Landlord's bankers by periodical order drawn by the Tenant on
                 the Tenant's bank or other account to reach the Landlord's
                 bankers on the due date for rent hereunder)

2.2              secondly by way of further or additional rent from time to
                 time sums equal to the amounts paid by the Landlord to the
                 Superior Landlord pursuant to clause 3(2) of the Superior
                 Lease in respect of the insurance of the Demised Premises such
                 further rent to be paid on demand

3.       THE Tenant HEREBY COVENANTS with the Landlord to the intent that the
         obligations may continue throughout the Term as follows:





                                     - 5 -
<PAGE>   8
3.1              to pay during the Term the rents hereby reserved at the times
                 and in the manner aforesaid without any deduction

3.2              to bear pay and discharge all existing and future rates taxes
                 duties charges assessments impositions and outgoings and
                 obligations whatsoever (whether parliamentary parochial local
                 or of any other description and whether or not of a capital or
                 non-recurring nature which now are or may at any time
                 hereafter during the Term be charged levied rated assessed or
                 imposed upon or payable in respect of the Demised Premises or
                 any part thereof or upon the owner or occupier in respect
                 thereof and also to pay and discharge and indemnify the
                 Landlord against any empty rate rating surcharge or similar
                 imposition which may whether during or after the expiration or
                 sooner determination of the Term be imposed in respect of the
                 Demised Premises or any part thereof if and in so far as the
                 same arises by reason of any failure to occupy the Demised
                 Premises or any part thereof during the Term PROVIDED THAT
                 this sub-clause shall under no circumstances be construed as
                 making the Tenant liable in any way for any taxes or charges
                 (of whatever nature) imposed or assessed as a result of any
                 disposal of the Landlord's interest in the Demised Premises or
                 any dealing by the Landlord therewith

3.3              to pay to the suppliers thereof all charges for gas and
                 electricity (including meter rents if any) consumed in the
                 Demised Premises during the Term

3.4              notwithstanding anything else contained in this Lease not to
                 alter or add to the Demised Premises or change the use thereof
                 or dispose of





                                     - 6 -
<PAGE>   9
                 or deal in the Tenant's interest therein in such manner as
                 thereby to involve the Landlord in any fiscal liability
3.5              to deliver to the Landlord free of charge a copy of every
                 notice order requisition direction or proposal given made or
                 issued by a competent authority affecting the Demised Premises
                 or the user of the Demised Premises as soon as the Tenant
                 becomes aware thereof and at the request and joint cost of the
                 Landlord and Tenant to make or join in making such objections
                 or representations against or in respect of any such notice
                 order requisition direction or proposal as the Landlord shall
                 reasonably deem expedient

3.6              to repay on demand to the landlord all sums incurred by the
                 Landlord in connection with the cost of making repairing and
                 cleansing all party and other walls gutters sewers drains
                 pipes conduits wires and cables belonging to or used with the
                 Demised Premises in common with adjoining or neighbouring
                 premises all amounts due from the Tenant under this sub-clause
                 being recoverable as rent arrears

3.7              in the years ending 28th September 1994 (but only if
                 decoration for that year is required by the Superior Landlord)
                 and 28th September 1997 and in the last six months of the Term
                 (however determined) but not in two successive years to paint
                 or otherwise treat as the case may require the whole of the
                 outside woodwork ironwork metal work cement or stucco work (if
                 any) and other external parts of the Demised Premises usually
                 or requiring to be painted or otherwise treated with two good
                 coats of good quality paint or other suitable material of the
                 good quality in a proper and workmanlike manner and at the
                 same





                                     - 7 -
<PAGE>   10
                 times with every such painting to clean restore point and make
                 good the external brickwork stucco and stonework of the
                 Demised Premises to the extent that may be necessary all such
                 works to be carried out to the reasonable satisfaction of the
                 Landlord and the colours and patterns of all such works of
                 painting and decorating on the final occasion during the Term
                 to be previously approved in writing by the Landlord

3.8              in the year ending 29th September 1995 (but only if decoration
                 for that year is required by the Superior Landlord) and in the
                 last six months of the Term (however determined) but not in
                 two successive years to paint paper plaster or otherwise treat
                 as the case may require all interior parts of the Demised
                 Premises usually or requiring to be painted papered plastered
                 or otherwise treated with not less than two coats of good
                 quality paint or other suitable material of good quality in a
                 proper and workmanlike manner the colour and quality of the
                 paint and other finishes in the last six months of the Term to
                 be first approved by the Landlord and also at the same times
                 with every such painting to the extent necessary to wash down
                 all tiles glazed bricks and similar washable surfaces and make
                 good all ornamental works

3.9              (a)      to keep in good and substantial repair order and
                          condition the whole of the Demised Premises
                          (including the exterior the structure the walls the
                          roofs and foundations thereof and any alterations
                          additions or improvements to the Demised Premises)
                          and the water ventilation sanitary and heating
                          apparatus and the sewers drains and appurtenances
                          thereof and the boundary walls and fences of the
                          Demised Premises and to carry out from time





                                     - 8 -
<PAGE>   11
                          to time whenever requisite all necessary reparations
                          and rebuilding works and amendments whatsoever

                 (b)      to keep the Demised Premises clean tidy and properly
                          cleansed and in particular to clean the windows
                          therein as often as occasion shall require

                 (c)      to keep the open areas of the Demised Premises clean
                          and tidy and to maintain the trees and shrubs thereon

3.10             not at any time during the said term to make or permit or
                 suffer to be made any alteration or addition whatsoever to the
                 Demised Premises other than (and subject to the prior approval
                 of the Landlord to the plans and specifications thereof) the
                 erection and dismantling of non-structural partitioning

3.11             not to make or permit or suffer to be made any alteration or
                 addition to any electrical installation in or on the Demised
                 Premises except in accordance with the terms and conditions
                 laid down by the Institution of Electrical Engineers and the
                 regulations of the relevant electricity supply authority

3.12             to permit the Landlord and its agents with or without workmen
                 and others at any reasonable time or times and upon reasonable
                 notice in writing (save in emergency) to enter and examine the
                 Demised Premises to ensure that nothing has been done therein
                 which constitutes a breach of any of the covenants contained
                 in these presents and to examine the state and condition of
                 the Demised Premises

3.13             duly and immediately to remedy repair and make good all
                 breaches of covenant and defects of which notice in writing
                 shall be given by the





                                     - 9 -
<PAGE>   12
                 Landlord to the Tenant and which the Tenant shall be liable to
                 remedy repair or make good under the covenants contained in
                 this Lease and in case the Tenant shall make default in
                 commencing and thereafter diligently proceeding with so doing
                 within two months after the date of any such notice it shall
                 be lawful (but not obligatory) for the Landlord without
                 prejudice to the right of re-entry hereinafter contained to
                 enter upon the Demised Premises and to remedy repair and make
                 good the same at the cost of the Tenant which cost together
                 with the proper expenses of the Landlord (including surveyors'
                 and other professional fees) thereby incurred shall be a debt
                 due from the Tenant to the Landlord and be forthwith
                 recoverable by action

3.14             to permit the Landlord and its agents at any reasonable time
                 or times upon reasonable notice in writing (save in emergency)
                 to enter the Demised Premises and to take schedules or
                 inventories of the fixtures and things to be yielded up at the
                 expiration or sooner determination of the Term

3.15             to permit the Superior Landlord and all persons authorised by
                 it and their agents and workmen and the owners and occupiers
                 of any adjoining or neighbouring premises or their respective
                 agents and workmen at any reasonable time or times upon
                 reasonable notice in writing (save in emergency) to enter upon
                 the Demised Premises where necessary for executing repairs
                 additions or alterations to or upon any adjoining or
                 neighbouring premises or for building on land adjoining the
                 Demised Premises or for laying constructing repairing
                 maintaining renewing making connections with or cleansing or
                 keeping in good





                                     - 10 -
<PAGE>   13
                 order and condition all pipes drains channels watercourses
                 sewers wires cables gutters ditches culverts fences or other
                 conveniences which shall belong to or serve the Demised
                 Premises in common with other premises or be in or upon the
                 Demised Premises and also for the purpose of laying down
                 maintaining repairing renewing and testing drainage gas and
                 water pipes and electric wires or cables or for other similar
                 purposes the persons entering making good all damage thereby
                 occasioned to the Demised Premises

3.16             (a)      at all convenient hours in the daytime to permit all
                          prospective purchasers of or dealers in the
                          Landlord's reversionary interest by order in writing
                          of the Landlord or its agents to view the Demised
                          Premises without interruption

                 (b)      to permit the Landlord or its agents at any time
                          within six calendar months next before the expiration
                          of the Term to enter upon the Demised Premises and to
                          fix and retain without interference upon any suitable
                          part or parts thereof but not so as to obstruct any
                          doors or windows a notice board for re- letting the
                          same and to permit all persons by order in writing of
                          the Landlord or its agents to view the Demised
                          Premises at all convenient hours in the daytime
                          without interruption

3.17             to occupy the Demised Premises forthwith and not to use or
                 permit or suffer the same to be used for any noisy noisome
                 offensive or dangerous trade activity manufacture business or
                 occupation or for any illegal or immoral purpose nor to do or
                 permit or suffer to be done on the Demised Premises any act
                 matter or thing whatsoever which may





                                     - 11 -
<PAGE>   14
                 be or in the reasonable opinion of the Landlord tend to become
                 an annoyance nuisance damage disturbance inconvenience or to
                 the prejudice of the Landlord or the owners or occupiers of
                 any adjoining or neighbouring premises or the neighbourhood
                 and without prejudice to the generality of the foregoing not
                 to use or permit the Demised Premises to be used otherwise
                 than as offices PROVIDED THAT no representation or warranty is
                 or has prior to the date hereof been given or made by or on
                 behalf of the Landlord that any such use is or will be or will
                 remain a permitted use under the Planning Acts or that the
                 Demised Premises are or will remain otherwise fit for any such
                 use

3.18             (a)      not to make or permit or suffer to be made any
                          application for planning permission in respect of the
                          Demised Premises without the consent of the Landlord
                          such consent not to be unreasonably withheld

                 (b)      not to do or omit or permit or suffer to be done or
                          omitted any act or thing on or in relation to the
                          Demised Premises or the user of the Demised Premises
                          the doling or omission of which shall constitute a
                          contravention of the Planning Acts

                 (c)      promptly to execute at the Tenant's own expense all
                          such works as are or may under or in pursuance of the
                          Planning Acts or any other Act or Acts of Parliament
                          already or hereafter to be passed be directed or
                          required by any local public or other competent
                          authority to be executed at any time upon or in
                          respect of the Demised Premises or the user thereof
                          whether by the Landlord or Tenant thereof (including
                          without prejudice to





                                     - 12 -
<PAGE>   15
                          the generality of the foregoing the provision and
                          maintenance of fire escapes and toilet facilities and
                          elimination of smoke effluvia vapour and grit)

3.19             (a)      not to carry on or suffer upon the Demised Premises
                          any trade business or occupation in any manner or do
                          or suffer any other thing which may make void or
                          voidable any policy for the insurance of the Demised
                          Premises or render any increased or extra premium
                          payable for such insurance and to comply at its own
                          expense with all reasonable directions and
                          recommendations of the insurers of the Demised
                          Premises

                 (b)      to make up out of its own moneys any deduction in any
                          insurance moneys paid by the Superior Landlord's
                          insurers made as a result of repair or maintenance of
                          the Demised Premises not in compliance with the
                          covenants in this Lease

                 (c)      to insure and keep insured in the name of the
                          Landlord (and if so required the Superior Landlord)
                          and of the Tenant all the plate glass windows and
                          doors in the Demised Premises against breakage in an
                          insurance office to be nominated by the Landlord from
                          time to time to the full value thereof and to pay all
                          premiums necessary for that purpose and whenever
                          required to produce to the Landlord or its agent the
                          policy or policies of insurance and the receipt for
                          the current year's premium and to cause all moneys
                          received by virtue of such insurance to be forthwith
                          laid out in reinstating the said plate glass windows





                                     - 13 -
<PAGE>   16
                          and doors with plate glass of the same quality and
                          thickness and to make up any deficiency out of the
                          Tenant's own moneys

3.20             not to hold or permit or suffer to be held upon the Demised
                 Premises any sale by auction public exhibition political
                 meeting show spectacle or gambling

3.21             not to keep or permit or suffer to be kept on the Demised
                 Premises any material of a dangerous combustible explosive
                 radio-active or other similar nature except in accordance with
                 the provisions of any relevant Act or Acts of Parliament for
                 the time being in force and after due notice to the insurers
                 of the Demised Premises and payment of every increased or
                 extra insurance premium which ought to be paid

3.22             not to fix to or place upon or permit or suffer to be fixed to
                 or placed upon the Demised Premises any machinery article or
                 substance which in the reasonable opinion of the landlord may
                 be liable to damage or overload the structural parts or roofs
                 or floors of the buildings included in the Demised Premises

3.23             not without the consent in writing of the Landlord first
                 obtained (such consent not to be unreasonably withheld or
                 delayed) to affix or display or permit or suffer to be affixed
                 or displayed to or on the Demised Premises any sign fascia
                 hoarding poster placard skysign flagpole mast lettering or
                 advertisement whatsoever which shall be visible from outside
                 the Demised Premises and in default of obtaining such consent
                 the Landlord may enter and remove the same at the cost of the
                 Tenant

3.24             to take all steps necessary to prevent any encroachment upon
                 the Demised Premises or the acquisition of any new right to
                 light passage





                                     - 14 -
<PAGE>   17
                 drainage or other encroachment over upon or under the Demised
                 Premises and to give notice to the Landlord of any threatened
                 encroachment or attempt to acquire any such easement

3.25             not to underlet the whole or any part of the Demised Premises
                 nor to assign charge or part with or share possession or
                 occupation of or permit any person to occupy the Demised
                 Premises or any part or parts (as opposed to the whole)
                 thereof:

                 (a)      except by an assignment or charge of the whole of the
                          Demised Premises
                 (b)      without the Landlord's previous written consent
                          (which shall not be unreasonably withheld or delayed)

                 PROVIDED THAT the Landlord may on any assignment of this Lease
                 require that the Tenant shall:

                          (i)     procure that the assignee covenants with the
                                  Landlord to pay the rents reserved (including
                                  substituted rents) and perform and observe
                                  the covenants on the part of the Tenant
                                  contained in this Lease and

                          (ii)    if the assignee is a private limited company
                                  or if the Landlord shall otherwise require
                                  procure that a surety of sufficient financial
                                  status having regard to the obligations
                                  contained in this Lease shall covenant with
                                  the Landlord that the assignee will pay the
                                  said rents (including substituted rents) and
                                  perform and observe the said covenants and to
                                  indemnify and save harmless the Landlord
                                  against all losses damages costs and





                                     - 15 -
<PAGE>   18
                                  expenses arising by reason of any default of
                                  the said assignee and such covenant shall
                                  further provide in the usual form that any
                                  neglect or forbearance of the Landlord shall
                                  not release or exonerate such persons and
                                  shall further provide for such persons to
                                  accept a new lease of the Demised Premises
                                  upon disclaimer of these presents by the said
                                  assignee or on its behalf if so required by
                                  the Landlord within six months of such
                                  disclaimer (such new lease to be for the
                                  residue then unexpired of the Term and at the
                                  rents payable and subject to the same
                                  tenant's covenants and to the same provisos
                                  and conditions as those in force immediately
                                  before such disclaimer and to be granted at
                                  the cost of such persons in exchange for a
                                  counterpart duly executed by them)

3.26             within 14 days of every assignment or charge of this Lease to
                 give notice thereof in writing with particulars thereof to the
                 Landlord's solicitors and produce such instrument for
                 registration by them and supply a true copy thereof and to pay
                 to the Landlord's solicitors a reasonable registration fee in
                 respect of each such instrument such fee to be determined by
                 the Landlord's solicitors

3.27             to take such measures as may be necessary to ensure that any
                 effluent discharged into the drains or sewers which belong to
                 or serve the Demised Premises will not be corrosive or in any
                 way harmful to the said drains or sewers or cause any
                 obstruction or deposit therein





                                     - 16 -
<PAGE>   19
3.28             not to discharge or allow to be discharge any solid matters
                 from the Demised Premises into the drains or sewers which
                 belong to or serve the Demised Premises nor to discharge or
                 allow to be discharged therein any fluid of a poisonous or
                 noxious nature

3.29             not to install or keep or permit or suffer to be installed or
                 kept on the Demised Premises any machinery which causes undue
                 noise fumes or vibrations liable to result in nuisance injury
                 or damage to persons or to the Demised Premises or to
                 adjoining or neighbouring premises

3.30             to keep the Demised Premises supplied and equipped with all
                 fire fighting and extinguishing appliances as may from time to
                 time be required by law or by the insurers of the Demised
                 Premises and also to keep in force regular maintenance
                 contracts as necessary for such fire fighting and
                 extinguishing appliances

3.31             to give notice forthwith to the Landlord of any "relevant
                 defect" within the meaning of Section 4 of the Defective
                 Premises Act 1972 or any statutory modification or
                 re-enactment thereof in the state of the Demised Premises and
                 at all times to display and maintain all notices relating
                 thereto (including the wording thereof) which the Landlord may
                 from time to time reasonably require to be displayed or
                 erected at or in the Demised Premises

3.32             to observe and perform the covenants rights exceptions
                 reservations and other matters contained mentioned or referred
                 to in the Charges Register (except for Charge Number 4) of
                 Title Number K601332 at H.M. Land Registry and to keep the
                 Landlord fully and effectually indemnified at all times and
                 the Tenant hereby indemnifies the





                                     - 17 -
<PAGE>   20
                 Landlord accordingly against all costs claims liabilities
                 actions and expenses arising from any breach non-observance or
                 non-performance of or non-compliance with any of the aforesaid
                 covenants rights exceptions reservations and other matters
3.33             to pay to the Landlord all proper costs charges and expenses

                 incurred by the Landlord including but without prejudice to
                 the generality of the foregoing legal and surveyors' costs:

                 (a)      incidental to or in contemplation of the preparation
                          and service of a notice under Section 146 of the Law 
                          of Property Act 1925 or in contemplation of any
                          proceedings under Sections 146 or 147 of the said Act
                          (whether or not any right of re-entry or forfeiture
                          has been waived by the Landlord or a notice served
                          under the said Section 146 is complied with by the
                          Tenant or the Tenant has been relieved under the
                          provisions of the said Act and notwithstanding
                          forfeiture is avoided otherwise than by relief granted
                          by the Court) and to indemnify and keep indemnified
                          the Landlord against all costs charges expenses claims
                          and demands whatsoever in respect of the said
                          proceedings and the preparation and service of the
                          said notice

                 (b)      incidental to or in contemplation of the preparation
                          and service of a Schedule of Dilapidations at any
                          time during or after the expiration of the Term

                 (c)      in connection with or in procuring the remedying of
                          any breach of covenant on the part of the Tenant
                          contained in this Lease





                                     - 18 -
<PAGE>   21
                 (d)      in connection with any application for consent
                          required by this Lease whether or not such
                          application is withdrawn by the Tenant or consent be
                          granted

3.34             at all times during the Term at the Tenant's own expense to
                 execute all works and provide and maintain all arrangements
                 required by and to observe and comply in all respects with the
                 provisions and requirements of any and every enactment (which
                 expression in this covenant includes as well any and every Act
                 of Parliament already or hereafter to be passed as any and
                 every notice direction order regulation or bye-law already or
                 hereafter to be made under or in pursuance of or deriving
                 effect from any such Act) or required by any government
                 department public local or other authority or duly authorised
                 officer or Court of competent jurisdiction acting under or in
                 pursuance of any enactment as are or may be directed or
                 required to be executed or provided or maintained at any time
                 during the said term upon or in respect of the Demised
                 Premises or any additions or improvements thereto or the user
                 thereof for any purposes or the employment therein of any
                 person or any fixtures machinery plant or chattels for the
                 time being affixed hereto or being thereupon or used for the
                 purposes thereof whether by the owner or the occupier thereof
                 AND to indemnify and keep indemnified the Landlord at all
                 times against all costs charges and expenses of or incidental
                 to the execution of any works or the provision or maintenance
                 of any arrangements so directed or required as aforesaid AND
                 not at any time during the said term to do or omit or suffer
                 to be done or omitted on or about the





                                     - 19 -
<PAGE>   22
                 Demised Premises any act or thing by reason of which the
                 Landlord may under any enactment incur or have imposed upon it
                 or become liable to pay any penalty damages compensation costs
                 charges or expenses

3.35             to indemnify and keep indemnified the Landlord from and
                 against legal liability in respect of all actions proceedings
                 claims demands losses costs expenses damages and liability in
                 respect of any injury to any person or damage to any property
                 movable or immovable by reason of or arising in any way
                 directly or indirectly out of the non-compliance by the Tenant
                 with its obligations under this Lease and whether as to the
                 repair and the condition of the Demised Premises or any
                 alteration to or the user of the Demised Premises or otherwise
                 and from all proceedings costs claims and demands of
                 whatsoever nature in respect of any such liability or alleged
                 liability

3.36             to be responsible for and to indemnify the Landlord against
                 all damage occasioned to the Demised Premises or any adjacent
                 or neighbouring premises or to any person caused by any act
                 default or negligence of the Tenant or the servants agents
                 licensees or invitees of the Tenant
3.37             to yield up unto the Landlord at the expiration or sooner

                 determination of the Term so painted treated repaired cleansed
                 maintained amended and kept as aforesaid the Demised Premises
                 and the keys and all additions and improvements made thereto
                 in the meantime and all fixtures of every kind in or upon the
                 Demised Premises or which during the Term may be affixed or
                 fastened to or upon the same except tenant's or trade fixtures
                 and prior to the expiration or sooner





                                     - 20 -
<PAGE>   23
                 determination of the Term in case any of the Landlord's or
                 Superior Landlord's fixtures and fittings shall be missing
                 broken damaged or destroyed forthwith to replace them with
                 others of a similar character and of equal quality and at such
                 time to replace to the extent reasonably necessary all carpets
                 with carpets of at least equal quality and of a colour and
                 design approved by the Landlord (such approval not to be
                 unreasonably withheld) and in the event of any alterations
                 having been made during the Term to the Demised Premises to
                 reinstate the Demised Premises (if so required by the
                 Landlord) to the condition in which they were prior to the
                 making of such alterations and in any event to remove any
                 moulding sign writing or painting of the name or business of
                 the Tenant and other persons from the Demised Premises and
                 make good any damage caused by such removal or removal of the
                 Tenant's fixtures fittings furniture and effects

3.38             immediately prior to the expiration or sooner determination of
                 the said term at the cost of the Tenant if so requested by the
                 Landlord to remove and make good all alterations or additions
                 made to the Demised Premises by the Tenant at any time during
                 the Term

3.39             wherever in this Lease provision is made for the Tenant to pay
                 any sum (including without prejudice to the generality of the
                 foregoing the rents reserved by this Lease legal costs
                 registration fees surveyors' and other professional fees
                 charges and expenses) on which value added tax is payable then
                 to pay in addition to that sum value added tax on that sum at
                 the rate appropriate at the time of the supply





                                     - 21 -
<PAGE>   24
3.40             to observe and perform the covenants and conditions on the
                 part of the lessee contained in the Superior Lease so far as
                 they are consistent herewith and to indemnify the Landlord
                 from and against any actions proceedings claims damages costs
                 expenses or losses arising from any breach non-observance or
                 non-performance of such covenants and conditions

4.       THE Landlord HEREBY COVENANTS with the Tenant as follows:

4.1              that the Tenant paying the rents hereinbefore reserved and
                 observing and keeping the several covenants by the Tenant
                 herein contained may peaceably hold and enjoy the Demised
                 Premises during the term without any interruption by the
                 Landlord or by any person lawfully claiming through under or
                 in trust for it

4.2              on the request and at the expense of the Tenant to take
                 reasonable steps to enforce the covenants on the part of the
                 Superior Landlord contained in the Superior Lease

4.3              to pay the rents reserved by the Superior Lease

5.       PROVIDED ALWAYS AND IT IS HEREBY AGREED as follows:

5.1              that if the said yearly rents and payments hereby reserved or
                 any part thereof shall at any time be in arrear and unpaid for
                 14 days after the same shall have become due (whether any
                 formal or legal demand therefor shall have been made or not)
                 or if the Tenant shall at any time fail or neglect to perform
                 or observe any of the covenants conditions or agreements
                 herein contained and on the Tenant's part to be performed and
                 observed or if the Tenant:





                                     - 22 -
<PAGE>   25
                 (a)      being a company shall enter into liquidation whether
                          compulsory or voluntary (not being a voluntary
                          liquidation for the purpose of amalgamation or
                          reconstruction) or have a winding up Order made
                          against it or if a Receiver shall be appointed of its
                          undertaking or permit any execution to be levied on
                          the Demised Premises or

                 (b)      being a natural person shall have a bankruptcy order
                          made against him or permit any execution to be levied
                          on the Demised Premises or enter into any arrangement
                          or composition for the benefit of his creditors

                 then and in any such case it shall be lawful for the Landlord
                 or any person or persons duly authorised by it into or upon
                 the Demised Premises or any part thereof in the name of the
                 whole to re-enter and the Demised Premises peaceably to hold
                 and enjoy thenceforth as if these presents had not been made
                 without prejudice to any right of action or remedy of the
                 Landlord in respect of any antecedent breach of any of the
                 covenants by the Landlord hereinbefore contained

5.2              if the rents hereby reserved or any part thereof shall be
                 unpaid after becoming payable (whether legally demanded or
                 not) or if any sum due from the Tenant shall remain unpaid
                 after becoming due then the Tenant shall pay by way of further
                 rent interest on the sum outstanding from the date it became
                 due until payment at the rate of 4% per annum over Midland
                 Bank plc base rate for the time being





                                     - 23 -
<PAGE>   26
5.3              all sums due to the Landlord under this Lease shall be payable
                 as rent and the Landlord shall have the same remedies for the
                 recovery thereof as the Landlord would or might have for rent
                 in arrear

5.4              if the Demised Premises or any part thereof shall be destroyed
                 or damaged by fire or other risk against which the Superior
                 Landlord shall have insured so as to be unfit for occupation
                 and use then (unless the insurance money shall be wholly or
                 partially irrecoverable by reason of any act or default of the
                 Tenant) payment of the rent or of a fair and just proportion
                 thereof according to the nature and extent of such destruction
                 or damage shall be suspended until the Demised Premises or the
                 part so destroyed or damaged shall be again rendered fit for
                 occupation and use PROVIDED THAT if no building contract has
                 been entered into to reinstate the Demised Premises or repair
                 such damage within three years from the date of destruction or
                 damage either party shall be entitled to determine the term
                 hereby granted by giving to the other party written notice at
                 any time before such building contract has been entered into
                 to expire at any time whereupon the present demise and
                 everything herein contained shall cease and be void but
                 without prejudice to the rights and remedies of either party
                 against the other in respect of any antecedent claim or breach
                 of covenant PROVIDED FURTHER THAT the Tenant's right to
                 determine the term pursuant to this clause shall only apply to
                 the extent that insurance money shall not be partly or wholly
                 irrecoverable by reason solely or in part of any act or
                 default of the Tenant and any dispute





                                     - 24 -
<PAGE>   27
                 concerning this clause shall be referred to arbitration in
                 accordance with the Arbitration Act 1950

5.5              the regulations as to service of notices contained in Section
                 196 of the Law of Property Act 1925 as amended by the Recorded
                 Delivery Service Act 1962 shall be deemed to be incorporated
                 herein for the purpose of service of all notices
5.6              having been authorised to do so by an Order of the Tunbridge

                 Wells County Court made on the   29th   day of  July 1993
                 under the provisions of Section 38(4) of the Landlord and
                 Tenant Act 1954 as amended by Section 5 of the Law of Property
                 Act 1969 the parties hereto agree that the provisions of
                 Sections 24 to 28 inclusive of that Act should be excluded in
                 relation to the demise hereby created

5.7              that if at any time hereafter any dispute doubt or question
                 shall arise between the Landlord and the Tenant touching the
                 construction meaning or effect of these presents or any clause
                 or thing herein contained or their respective rights or
                 liabilities under these presents or otherwise in relation to
                 the said premises or in case any valuation shall require to be
                 made under the provisions hereinbefore contained (for which no
                 provision is made elsewhere in this Lease) then every such
                 dispute shall be referred to an arbitrator to be appointed
                 either by agreement between the parties or in default of
                 agreement by the President for the time being of the Royal
                 Institution of Chartered Surveyors in accordance with the
                 Arbitration Act 1950 or any statutory modification or
                 enactment in that behalf for the time being in force





                                     - 25 -
<PAGE>   28
5.8              notwithstanding the acceptance of or demand for rent by the
                 Landlord or its agents with knowledge of a breach of any of
                 the covenants on the part of the Tenant herein contained the
                 Landlord's right to forfeit this Lease on the ground of such
                 breach shall remain in force and the Tenant shall not in any
                 proceedings for forfeiture be entitled to rely upon any such
                 acceptance or demand as aforesaid as a defence
5.9              the Tenant shall not be or become entitled to any compensation

                 on quitting the Demised Premises under the provisions of
                 Section 37 of the Landlord and Tenant Act 1954 or any
                 statutory modification or re- enactment thereof

6.       PROVIDED ALWAYS AND IT IS HEREBY AGREED AND DECLARED
         as follows:

6.1              In this clause:

                 "REVIEW DATE" shall mean 29th September 1995

                 "REVIEW PERIOD" shall mean the period between the Review Date
                 and the end of the Term 

                 "CURRENT RENTAL VALUE" shall mean such rent as would be 
                 obtainable on the Review Date for the Demised Premises in good
                 and substantial repair and condition and fit for immediate
                 occupation and use let as a whole without premium upon the open
                 market by a willing landlord to a willing tenant on the
                 assumption of a letting with vacant possession for a term equal
                 to the original length of the term of the Superior Lease on the
                 basis that all covenants and conditions of this Lease have been
                 fully complied with and that no work has been carried out
                 thereon by the Tenant its sub-tenants or their predecessors 
                 in title during the Term
        
        
        


                                     - 26 -
<PAGE>   29
                 which has diminished the rental value of the Demised Premises
                 and that if the Demised Premises have been destroyed or
                 damaged they have been fully restored and upon a lease in the
                 same terms in all respects as these presents (other than that
                 as to the amount of the original rent but including this
                 present clause) as varied from time to time and with the
                 benefit of any licences granted by the Landlord and any waiver
                 or variation beneficial to the Tenant of any of the covenants
                 and conditions contained herein and on the assumption that the
                 whole of the area of the ground and first floors of the
                 Demised Premises shown within the red lines on drawing numbers
                 1530/16 and 1530/17 respectively annexed to the Superior Lease
                 is net usable space available for unrestricted office use
                 notwithstanding that all of such space may not be so usable
                 but disregarding: 

                 (a)      any effect on rent of the fact that the Tenant has 
                          been in occupation of the Demised Premises or of any 
                          goodwill attaching to the Demised Premises by reason 
                          of the Tenant having carried on business on the 
                          Demised Premises and

                 (b)      any effect on rent of any improvement to the Demised
                          Premises carried out by the Tenant otherwise than in
                          pursuance of an obligation arising under this Lease

                 (c)      any effect on rent of any condition or conditions
                          attaching to any planning permission or permissions
                          from time to time relating to the Demised Premises

6.2              The rent payable in respect of the Review Period shall be
                 ascertained in the following manner:





                                     - 27 -
<PAGE>   30
                 (a)      the parties shall endeavour to agree in writing not
                          later than three months before the Review Date upon
                          the substituted rent payable throughout the Review
                          Period
                 (b)      if the parties fail to agree the substituted rent by

                          a date three months before the Review Date either
                          party may require the substituted rent to be
                          determined under the following clauses 6.3 to 6.7
                          (inclusive) and the sum so determined shall be the
                          substituted rent payable through the Review Period

6.3              The determination of a substituted rent consequent upon the
                 failure by the parties to agree the same shall be effected by
                 a referee agreed on by the parties or if not agreed on by them
                 within one month from the nomination in writing of a referee
                 by one party to the other appointed on the application of
                 either party by the President (or some other officer if the
                 President is unable to act) for the time being of the Royal
                 Institution of Chartered Surveyors (or any successor to that
                 Institution)

6.4              The referee agreed upon or appointed under clause 6.3 shall
                 act as an arbitrator pursuant to the Arbitration Act for the
                 time being in force (save as modified by the provisions of
                 this clause)

6.5              (a)      The referee shall notify in writing to the parties
                          such sum as he shall determine to be the current
                          rental value of the Demised Premises at the Review
                          Date and (subject to the provisions of clause 6.6
                          hereof) such sum shall be the substituted rent
                          payable throughout the Review Period

                 (b)      The award of the referee shall also provide for the
                          manner in which the costs of the determination shall
                          be borne and may





                                     - 28 -
<PAGE>   31
                          also provide for the payment of costs by one party to
                          the other and in settling upon such matters the
                          referee may have regard to any offers made by either
                          party to the other and the nature and content of any
                          representations made to him by or on behalf of the
                          parties

6.6              Under no circumstances shall the substituted rent for the
                 Review Period be less than the rent reserved by this Lease for
                 the period prior to the commencement of the Review Period or
                 the rent payable by the Landlord to the Superior Landlord
                 pursuant to the provisions for review of rent contained in the
                 Superior Lease whichever shall be higher

6.7              During any period that any substituted rent payable under the
                 preceding clauses has not been ascertained the Tenant shall
                 continue to pay rent of the amount previously payable but
                 within 14 days of such ascertainment the Tenant shall pay to
                 the Landlord any difference between the amounts actually paid
                 and the amounts payable as a result of such ascertainment
                 together with interest at the base rate of Midland Bank plc
                 for the time being in force on a day to day basis

6.8              During any period that any substituted rent ascertained under
                 this clause shall not be recoverable in whole or part by
                 virtue of any statute regulation instrument or order the
                 Tenant shall pay rent at the highest level from time to time
                 recoverable under the restrictions and shall pay the full
                 amount of the substituted rent as soon as the restrictions
                 shall cease to be effective





                                     - 29 -
<PAGE>   32
6.9              If at or following the Review Date any statute regulation
                 instrument or order shall prevent the exercise of the process
                 of ascertainment of a substituted rent provided for in this
                 clause such exercise shall be postponed until such prohibition
                 be repealed or so released or modified as to permit such step
                 to be taken and the Review Date shall be a date three months
                 after such repeal release or modification as the case may be

6.10             After the ascertainment of any substituted rent under this
                 clause a memorandum recording the amount the same signed by or
                 on behalf of the parties shall at the joint expense of the
                 parties forthwith be endorsed on this Lease and the
                 counterpart thereof

THE COMMON SEAL of MARLEY         )
WATERPROOFING LIMITED was         )
affixed to this deed in the       )
presence of:                      )
                                        [SEAL]

                                  Director

                                  /s/   [illegible signature]


                                  Secretary  /s/   [illegible signature]





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