CLIFFS DRILLING CO
S-4/A, 1997-11-13
DRILLING OIL & GAS WELLS
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<PAGE>   1
 
   
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON NOVEMBER 13, 1997
    
                                                      REGISTRATION NO. 333-36325
================================================================================
 
                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549
                             ---------------------
   
                                AMENDMENT NO. 3
    
                                       TO
                                    FORM S-4
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                             ---------------------
                            CLIFFS DRILLING COMPANY
 
                  (and certain subsidiaries identified below)
             (Exact name of registrant as specified in its charter)
 
<TABLE>
<C>                                <C>                                <C>
             DELAWARE                             1381                            76-0248934
 (State or other jurisdiction of      (Primary Standard Industrial             (I.R.S. Employer
  incorporation or organization)      Classification Code Number)           Identification Number)
SOUTHWESTERN OFFSHORE CORPORATION                    DELAWARE                1381               76-0503027
CLIFFS DRILLING INTERNATIONAL, INC.                  DELAWARE                1381               76-0236336
CLIFFS OIL AND GAS COMPANY                           DELAWARE                1311               74-2139293
CLIFFS DRILLING MERGER COMPANY                       DELAWARE                1381               76-0503026
DRL, INC.                                            DELAWARE                1381               76-0503389
CLIFFS DRILLING TRINIDAD LIMITED               TRINIDAD AND TOBAGO           1381                  N/A
WEST INDIES DRILLING JOINT VENTURE             TRINIDAD AND TOBAGO           1381                  N/A
(Exact name of registrant as specified in its    (State or other      (Primary Standard      (I.R.S. Employer
                   charter)                      jurisdiction of          Industrial          Identification
                                                 incorporation or    Classification Code         Number)
                                                  organization)            Number)
                                                                     EDWARD A. GUTHRIE
                                                                 VICE PRESIDENT -- FINANCE
           1200 SMITH STREET, SUITE 300                           CLIFFS DRILLING COMPANY
               HOUSTON, TEXAS 77002                            1200 SMITH STREET, SUITE 300
                  (713) 651-9426                                   HOUSTON, TEXAS 77002
         (Address, including zip code, and                            (713) 651-9426
      telephone number, including area code,              (Name, address, including zip code, and
   of registrant's principal executive offices)           telephone number, including area code,
                                                                   of agent for service)
</TABLE>
 
                                   Copies to:
 
<TABLE>
<C>                                                 <C>
                                                                       T. MARK KELLY
              W. GARNEY GRIGGS, ESQ.                              VINSON & ELKINS L.L.P.
              GRIGGS & HARRISON, P.C.                              2300 FIRST CITY TOWER
             1301 MCKINNEY, SUITE 3200                                  1001 FANNIN
               HOUSTON, TEXAS 77010                              HOUSTON, TEXAS 77002-6760
                  (713) 651-0600                                      (713) 758-4592
</TABLE>
 
     Approximate date of commencement of proposed sale of the securities to the
public: As soon as practicable following the effectiveness of this Registration
Statement.
 
     If the securities being registered on this Form are being offered in
connection with the formation of a holding company and there is compliance with
General Instruction G, 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, 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(d)
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.  [ ]
- ---------------------------
                             ---------------------
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
 
PROSPECTUS
 
                         [CLIFFS DRILLING COMPANY LOGO]
 
                               OFFER TO EXCHANGE
                     10.25% SENIOR NOTES DUE 2003, SERIES D
           FOR ALL OUTSTANDING 10.25% SENIOR NOTES DUE 2003, SERIES C
 
        THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M. NEW YORK CITY TIME,
   
                     ON DECEMBER 16, 1997, UNLESS EXTENDED
    
                             ---------------------
 
     Cliffs Drilling Company, a Delaware corporation (the "Company"), hereby
offers, upon the terms and subject to the conditions set forth in this
Prospectus and the accompanying letter of transmittal (the "Letter of
Transmittal," and together with this Prospectus, the "Exchange Offer"), to
exchange $1,000 principal amount of its 10.25% Senior Notes due 2003, Series D
(the "Exchange Notes"), which have been registered under the Securities Act of
1933, as amended (the "Securities Act"), pursuant to a Registration Statement
(as defined herein) of which this Prospectus constitutes a part, for each $1,000
principal amount of its outstanding 10.25% Senior Notes due 2003, Series C (the
"Old Notes"), of which $50,000,000 principal amount is outstanding. The form and
terms of the Exchange Notes are identical in all material respects to the form
and terms of the Old Notes except for certain transfer restrictions and
registration rights relating to the Old Notes. The Exchange Notes will evidence
the same debt as the Old Notes and will be issued under and be entitled to the
benefits of the Indenture (as defined herein). The Exchange Notes and the Old
Notes are collectively referred to herein as the "Notes."
 
     The Notes are senior unsecured obligations of the Company, ranking pari
passu in right of payment with all senior Indebtedness (as defined) of the
Company, senior to all Subordinated Indebtedness (as defined) of the Company,
and on a parity with the Company's outstanding Series B Notes (as defined). The
Notes are unconditionally guaranteed (the "Subsidiary Guarantees") on a senior
unsecured basis by the Company's principal subsidiaries (the "Subsidiary
Guarantors"), and the Subsidiary Guarantees rank pari passu in right of payment
with all senior Indebtedness of the Subsidiary Guarantors and senior to all
Subordinated Indebtedness of the Subsidiary Guarantors. The obligations of the
Subsidiary Guarantors under the Notes rank on a parity with the obligations of
the Subsidiary Guarantors under the Company's outstanding Series B Notes. The
Subsidiary Guarantees may be released under certain circumstances. The Notes and
Subsidiary Guarantees are effectively subordinated to secured Indebtedness of
the Company and the Subsidiary Guarantors, respectively, with respect to the
assets securing such Indebtedness, including any Indebtedness under the
Revolving Credit Facility (as defined), which is secured by liens on
substantially all of the assets of the Company and the Subsidiary Guarantors.
Without regard to the $50 million in principal amount of the Old Notes, the
Company and the Subsidiary Guarantors had no Indebtedness outstanding at August
31, 1997, other than (i) $2.4 million consisting of letters of credit secured by
liens on substantially all of the assets of the Company and the Subsidiary
Guarantors, which is effectively senior to, although nominally pari passu with,
the Notes and (ii) $150 million in principal amount of Series B Notes, which
ranks pari passu with the Notes. The Indenture governing the Exchange Notes will
permit the Company and its subsidiaries to incur additional Indebtedness in the
future, subject to certain limitations. See "Description of the Notes."
 
   
     The Company will accept for exchange any and all Old Notes that are validly
tendered on or prior to 5:00 p.m., New York City time, on the date the Exchange
Offer expires, which will be December 16, 1997, unless the Exchange Offer is
extended. See "The Exchange Offer -- Expiration Date; Extensions; Amendment."
Tenders of Old Notes may be withdrawn at any time prior to 5:00 p.m., New York
City time, on the business day prior to the Expiration Date (as defined herein),
unless previously accepted for exchange. The minimum period of time that the
Exchange Offer will remain open is 30 days from the date the Registration
Statement is declared effective, including all extensions. The Exchange Offer is
not conditioned upon any minimum principal amount of Old Notes being tendered
for exchange. However, the Exchange Offer is subject to certain conditions which
may be waived by the
 
                                             (Cover continued on next two pages)
    
                             ---------------------
 
      SEE "RISK FACTORS" BEGINNING ON PAGE 14 OF THIS PROSPECTUS FOR A
DISCUSSION OF CERTAIN FACTORS THAT SHOULD BE CONSIDERED IN EVALUATING AN
INVESTMENT IN THE NOTES.
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
 
   
               The date of this Prospectus is November 13, 1997.
    
<PAGE>   3
 
Company and to the terms and provisions of the Registration Rights Agreement (as
defined herein). Old Notes may be tendered only in denominations of $1,000
principal amount and integral multiples thereof. The Company has agreed to pay
the expenses of the Exchange Offer. See "The Exchange Offer."
 
     The Notes bear interest at the rate of 10.25% per annum, payable
semi-annually on May 15 and November 15 of each year, commencing November 15,
1997. Holders of Old Notes of record on November 1, 1997 will receive interest
on November 15, 1997 from the date of issuance of the Old Notes, August 7, 1997.
Holders of Exchange Notes of record on May 1, 1998 will receive interest on May
15, 1998 from the date of issuance of the Exchange Notes, plus an amount equal
to the accrued interest on the Old Notes from the date of the last interest
payment, November 15, 1997, to the date of exchange thereof. Interest on the Old
Notes accepted for exchange will cease to accrue upon issuance of the Exchange
Notes.
 
     The Old Notes were sold by the Company on August 7, 1997 to the Initial
Purchasers (as defined herein) in a transaction not registered under the
Securities Act in reliance upon Section 4(2) of the Securities Act. The Old
Notes were thereupon offered and sold by the Initial Purchasers only to
"qualified institutional buyers" (as defined in Rule 144A under the Securities
Act), each of whom agreed to comply with certain transfer restrictions and other
conditions. Accordingly, the Old Notes may not be offered, resold or otherwise
transferred in the United States unless registered under the Securities Act or
unless an applicable exemption from the registration requirements of the
Securities Act is available. The Exchange Notes are being offered hereunder in
order to satisfy the obligations of the Company under the Registration Rights
Agreement entered into with the Initial Purchasers in connection with the
offering of the Old Notes. See "The Exchange Offer" and "Registration Rights
Agreement."
 
     Based on no-action letters issued by the staff of the Securities and
Exchange Commission (the "Commission" or "SEC") to third parties, including
Exxon Capital Holdings Corporation, SEC No-Action Letter (available April 13,
1989), Morgan Stanley & Co. Inc., SEC No-Action Letter (available June 5, 1991)
(the "Morgan Stanley Letter") and Mary Kay Cosmetics, Inc., SEC No-Action Letter
(available June 5, 1991), the Company believes that the Exchange Notes issued
pursuant to the Exchange Offer may be offered for resale, resold and otherwise
transferred by the respective holders thereof (other than a "Restricted Holder,"
being (i) a broker-dealer who purchased Old Notes exchanged for such Exchange
Notes directly from the Company to resell pursuant to Rule 144A or any other
available exemption under the Securities Act or (ii) a person that is an
affiliate of the Company within the meaning of Rule 405 under the Securities
Act), without compliance with the registration and prospectus delivery
provisions of the Securities Act, provided that such Exchange Notes are acquired
in the ordinary course of such holder's business and such holder is not
participating in, and has no arrangement with any person to participate in, the
distribution (within the meaning of the Securities Act) of such Exchange Notes.
Eligible holders wishing to accept the Exchange Offer must represent to the
Company that such conditions have been met. Holders who tender Old Notes in the
Exchange Offer with the intention to participate in a distribution of the
Exchange Notes may not rely upon the Morgan Stanley Letter or similar no-action
letters. See "The Exchange Offer -- General." Each broker-dealer that receives
Exchange Notes for its own account pursuant to the Exchange Offer may be a
statutory underwriter and must acknowledge that it will deliver a prospectus in
connection with any resale of such Exchange Notes. A broker-dealer that delivers
such a prospectus to purchasers in connection with such resales will be subject
to certain of the civil liability provisions under the Securities Act and will
be bound by the provisions of the Registration Rights Agreement (including
certain indemnification rights and obligations). This Prospectus, as it may be
amended or supplemented from time to time, may be used by a broker-dealer in
connection with resales of Exchange Notes received in exchange for Old Notes
where such Old Notes were acquired by such broker-dealer as a result of
market-making activities or other trading activities. The Company has agreed
that it will make this Prospectus and any amendment or supplement to this
Prospectus available to any broker-dealer for use in connection with any such
resale for a period of up to 180 days after consummation of the Exchange Offer.
See "Plan of Distribution."
 
     The Company will not receive any proceeds from the Exchange Offer.
 
     The Exchange Notes will constitute a new issue of securities with no
established trading market, and there can be no assurance as to the liquidity of
any markets that may develop for the Exchange Notes or as to
 
                                        2
<PAGE>   4
 
the ability of or price at which the holders of Exchange Notes would be able to
sell their Exchange Notes. Future trading prices of the Exchange Notes will
depend on many factors, including, among others, prevailing interest rates, the
Company's operating results and the market for similar securities. The Company
does not intend to apply for listing of the Exchange Notes on any securities
exchange. Jefferies & Company, Inc. and ING Baring (U.S.) Securities, Inc.
(together, the "Initial Purchasers") have informed the Company that they
currently intend to make a market for the Exchange Notes. However, they are not
so obligated, and any such market making may be discontinued at any time without
notice. Accordingly, no assurance can be given that an active public or other
market will develop for the Exchange Notes or as to the liquidity of or the
trading market for the Exchange Notes.
 
     The Exchange Notes will be available initially only in book-entry form. The
Company expects that the Exchange Notes issued pursuant to this Exchange Offer
will be issued in the form of a Global Note (as defined herein), which will be
deposited with, or on behalf of, The Depository Trust Company (the "Depositary"
or "DTC") and registered in its name or in the name of Cede & Co., its nominee.
Beneficial interests in the Global Note representing the Exchange Notes will be
shown on, and transfers thereof will be effected through, records maintained by
the Depositary and its participants. After the initial issuance of the Global
Note, Exchange Notes in certificated form will be issued in exchange for the
Global Note only on the terms set forth in the Indenture. See "Description of
the Notes -- Book-Entry; Delivery and Form."
 
     THE EXCHANGE OFFER IS NOT BEING MADE TO, NOR WILL THE COMPANY ACCEPT
SURRENDERS FOR EXCHANGE FROM, HOLDERS OF OLD NOTES IN ANY JURISDICTION IN WHICH
THE EXCHANGE OFFER OR THE ACCEPTANCE THEREOF WOULD NOT BE IN COMPLIANCE WITH THE
SECURITIES OR BLUE SKY LAWS OF SUCH JURISDICTION.
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                              PAGE NO.
                                                              --------
<S>                                                           <C>
Available Information.......................................      4
Incorporation of Certain Documents by Reference.............      4
Disclosure Regarding Forward-Looking Information............      5
Prospectus Summary..........................................      6
Risk Factors................................................     14
The Company.................................................     19
Private Placement...........................................     21
Use of Proceeds.............................................     21
Capitalization..............................................     21
Selected Consolidated Financial Information.................     22
Selected Financial Information of Subsidiary Guarantors.....     23
The Exchange Offer..........................................     24
Description of Existing Indebtedness........................     30
Description of the Notes....................................     30
Registration Rights Agreement...............................     58
Transfer Restrictions on Old Notes..........................     60
Certain Federal Income Tax Considerations...................     61
Plan of Distribution........................................     63
Experts.....................................................     64
</TABLE>
 
   
     THIS PROSPECTUS INCORPORATES DOCUMENTS BY REFERENCE WHICH ARE NOT PRESENTED
HEREIN OR DELIVERED HEREWITH. THESE DOCUMENTS ARE AVAILABLE UPON REQUEST FROM
THE COMPANY. REQUESTS FOR SUCH COPIES SHOULD BE DIRECTED TO EDWARD A. GUTHRIE,
VICE PRESIDENT -- FINANCE, CLIFFS DRILLING COMPANY, 1200 SMITH STREET, SUITE
300, HOUSTON, TEXAS 77002 (TELEPHONE NUMBER (713) 651-9426). IN ORDER TO ENSURE
TIMELY DELIVERY OF THE DOCUMENTS, ANY REQUEST SHOULD BE MADE BY DECEMBER 2,
1997.
    
 
                                        3
<PAGE>   5
 
                             AVAILABLE INFORMATION
 
     The Company is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and in accordance
therewith files reports, proxy statements and other information with the
Commission. Such reports, proxy statements and other information filed by the
Company may be inspected and copied at the public reference facilities
maintained by the Commission, 450 Fifth Street, N.W., Judiciary Plaza,
Washington, D.C. 20549; and at the following regional offices of the Commission:
7 World Trade Center, Suite 1300, New York, New York 10048; and Citicorp Center,
500 West Madison Street, Suite 1400, Chicago, Illinois 60661. Copies of such
material can also be obtained from the Public Reference Section of the
Commission at 450 Fifth Street, N.W., Judiciary Plaza, Washington, D.C. 20549,
at prescribed rates. The Commission maintains a World Wide Web site on the
Internet at http://www.sec.gov that contains reports, proxy and information
statements and other information regarding registrants that file electronically
with the Commission. The Company's common stock ("Common Stock") is traded on
the New York Stock Exchange. The Company's reports, proxy statements and other
information concerning the Company can be inspected and copied at the offices of
The New York Stock Exchange, Inc., Eleven Wall Street, New York, New York 10005.
While any Notes that are "restricted securities" within the meaning of Rule
144(a)(3) under the Exchange Act remain outstanding, the Company will make
available, upon request, to any holder and any prospective purchaser of Notes,
the information required pursuant to Rule 144A(d)(4) under the Securities Act
during any period in which the Company is not subject to Section 13 or 15(d) of
the Exchange Act. Any such request should be directed to the Vice President --
Finance of the Company, 1200 Smith Street, Suite 300, Houston, Texas 77002,
telephone number (713) 651-9426.
 
     This Prospectus constitutes part of a registration statement on Form S-4
(herein, together with all amendments and exhibits, referred to as the
"Registration Statement") filed by the Company with the Commission under the
Securities Act. This Prospectus omits certain of the information set forth in
the Registration Statement. Reference is hereby made to the Registration
Statement and to the exhibits relating thereto for further information with
respect to the Company and the securities offered hereby. Statements contained
herein concerning the provisions of contracts or other documents are not
necessarily complete, and each such statement is qualified in its entirety by
reference to the copy of the applicable contract or other document filed with
the Commission. Copies of the Registration Statement and the exhibits thereto
are on file at the offices of the Commission and may be obtained upon payment of
the fee prescribed by the Commission, or may be examined without charge at the
public reference facilities of the Commission described above.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
     The following documents have been filed by the Company with the Commission
pursuant to the Exchange Act (File No. 0-16703) and are incorporated herein by
reference:
 
          (1) The Company's Current Report on Form 8-K dated May 23, 1996;
 
   
          (2) The Company's Annual Report on Form 10-K, as amended by Form
     10-K/A (Amendment No. 3), for the fiscal year ended December 31, 1996;
    
 
          (3) The Company's Quarterly Report on Form 10-Q for the quarter ended
     March 31, 1997;
 
          (4) The Company's Proxy Statement for the Annual Meeting of
     Stockholders held on May 21, 1997;
 
          (5) The Company's Quarterly Report on Form 10-Q for the quarter ended
     June 30, 1997;
 
          (6) The Company's Current Report on Form 8-K dated September 19, 1997
     (the "Form 8-K"); and
 
          (7) The Company's Current Report on Form 8-K dated October 16, 1997.
 
     All documents filed by the Company pursuant to Section 13(a), 13(c), 14 or
15(d) of the Exchange Act subsequent to the date of this Prospectus and prior to
the termination of the offering made by this Prospectus
 
                                        4
<PAGE>   6
 
shall be deemed to be incorporated by reference herein and to be a part hereof
from the date of filing thereof. Any statement contained in a document
incorporated or deemed to be incorporated by reference herein shall be deemed to
be modified or superseded for purposes of this Prospectus to the extent that a
statement contained herein, or in any other subsequently filed document that
also is or is deemed to be incorporated by reference herein, modifies or
supersedes such statement. Any such statement so modified or superseded shall
not be deemed, except as so modified or superseded, to constitute a part of this
Prospectus.
 
   
     The Company hereby undertakes to provide without charge to each person,
including any beneficial owner, to whom a copy of this Prospectus has been
delivered, upon the written or oral request of such person, a copy of any or all
of the documents incorporated by reference in this Prospectus (not including
exhibits to such documents, unless such exhibits are specifically incorporated
by reference into the information that this Prospectus incorporates by
reference). Requests for such copies should be directed to the Company at 1200
Smith Street, Suite 300, Houston, Texas 77002, Attention: Edward A. Guthrie,
Vice President -- Finance (telephone number (713) 651-9426). In order to ensure
timely delivery of such documents prior to the Expiration Date, any request
should be made by December 2, 1997.
    
 
     NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR MAKE ANY
REPRESENTATIONS OTHER THAN THOSE CONTAINED OR INCORPORATED BY REFERENCE IN THIS
PROSPECTUS AND THE ACCOMPANYING LETTER OF TRANSMITTAL AND, IF GIVEN OR MADE,
SUCH INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN
AUTHORIZED BY THE COMPANY OR THE EXCHANGE AGENT. NEITHER THE DELIVERY OF THIS
PROSPECTUS OR THE ACCOMPANYING LETTER OF TRANSMITTAL, OR BOTH TOGETHER, NOR ANY
SALE MADE HEREUNDER SHALL UNDER ANY CIRCUMSTANCES CREATE AN IMPLICATION THAT
THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF THE COMPANY SINCE THE DATE HEREOF.
NEITHER THIS PROSPECTUS NOR THE ACCOMPANYING LETTER OF TRANSMITTAL, OR BOTH
TOGETHER, CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO BUY ANY
OF THE SECURITIES OFFERED HEREBY BY ANYONE IN ANY JURISDICTION IN WHICH SUCH
OFFER OR SOLICITATION IS NOT AUTHORIZED OR IN WHICH THE PERSON MAKING SUCH OFFER
OR SOLICITATION IS NOT QUALIFIED TO DO SO OR TO ANY PERSON TO WHOM IT IS
UNLAWFUL TO MAKE SUCH OFFER OR SOLICITATION.
 
                DISCLOSURE REGARDING FORWARD-LOOKING INFORMATION
 
     This Prospectus and the documents incorporated by reference herein include
"forward-looking statements" within the meaning of Section 27A of the Securities
Act and Section 21E of the Exchange Act. All statements other than statements of
historical facts included in this Prospectus and the documents incorporated by
reference herein, including without limitation, statements regarding the
Company's financial position, business strategy, budgets, and plans and
objectives of management for future operations, are forward-looking statements.
Although the Company believes that the expectations reflected in such forward-
looking statements are reasonable, it can give no assurance that such
expectations will prove to have been correct. Important factors that could cause
actual results to differ materially from the Company's expectations ("Cautionary
Statements") are disclosed under "Risk Factors" and elsewhere in this Prospectus
and the documents incorporated by reference herein, including without
limitation, in conjunction with the forward-looking statements included in this
Prospectus.
 
                                        5
<PAGE>   7
 
                               PROSPECTUS SUMMARY
 
     The following summary is qualified in its entirety by reference to, and
should be read in conjunction with, the more detailed information and
consolidated financial statements (including the notes thereto) incorporated by
reference into this Prospectus. Unless the context otherwise requires, "Company"
refers to Cliffs Drilling Company and its consolidated subsidiaries.
 
                                  THE COMPANY
 
     Cliffs Drilling Company is an international contract drilling and
engineering company. The Company is primarily engaged in daywork drilling,
engineering services, and to a lesser extent, the development and operation of
mobile offshore production units ("MOPUs"). The Company has historically
deployed its assets in areas where it can achieve long-term growth and generate
stable cash flows and net income. This strategy has led to five consecutive
years of positive net income. The Company's domestic operations are concentrated
in the Texas/Louisiana Gulf Coast region and its foreign operations are
concentrated in Venezuela and the Middle East. The Company owns 14 jack-up
drilling rigs, 1 platform drilling rig, 11 land rigs and 5 MOPUs.
 
     The Company and its predecessors have been in the contract drilling
business since 1978. The Company entered the turnkey drilling business in 1982
in an effort to more fully utilize its existing fleet of rigs and complement its
daywork drilling operations. In response to the economic conditions which
adversely affected the domestic contract drilling business during the 1980s, the
Company undertook a strategic plan in 1989 to further diversify its scope of
operations and geographic concentration beyond the traditional domestic daywork
drilling market. The Company's management implemented a proactive approach to
identify, develop and exploit several market segments which provided higher
margins and more reliable operating income and cash flow. To achieve its
strategic objectives, the Company continued to emphasize its turnkey drilling
operations, expanded its well engineering and management services, became a
leader in the development and operation of MOPUs and deployed its drilling rigs
into selected international markets. With the implementation of this strategy,
the Company has positioned itself to benefit from increases in drilling and
production activities in several markets worldwide.
 
INDUSTRY CONDITIONS
 
     Activity in the contract drilling industry and related oil service
businesses has improved over the last two years due to increased worldwide
demand for oil and natural gas. Over the past several years, the supply of
offshore drilling rigs has declined while the demand for such rigs has
increased, resulting in the highest utilization rates since 1985. In addition,
oil and gas companies have experienced decreases in exploration and production
costs from technological advances such as increased use of 3-D seismic surveys,
advances in drill bits and completion technologies and use of new production
techniques such as MOPUs and subsea completions. In an effort to more quickly
realize the significant gas revenues attainable from shallow water drilling in
the Gulf of Mexico, oil and gas companies are producing reserves at faster
rates. These enhanced production methods increase the net present value of the
reserves produced and significantly shorten the reserve life in the Gulf of
Mexico, thereby necessitating additional drilling. In addition, the U.S. natural
gas market has improved after experiencing weak market conditions throughout the
early 1990s. All of these factors have resulted in increased demand for offshore
drilling rigs and an increase in both utilization and dayrates for jack-up
drilling rigs. Management believes the current market dynamics in the Gulf of
Mexico, South America, the Middle East and other international areas will result
in greater utilization of the Company's rigs and services.
 
COMPANY STRATEGY
 
     The Company's management has adopted a proactive approach to identify,
develop and exploit 3 market segments which the Company believes provide higher
margins and reliable operating income and cash flow. In addition, the Company
has sought to identify business opportunities that would expand its asset base,
increase profitability and enhance shareholder value. The Company's acquisition
criteria include, among others,
                                        6
<PAGE>   8
 
transactions designed to increase operating leverage and diversify
geographically. The Company's 3 primary business segments are daywork drilling,
engineering services and MOPU operations.
 
     Daywork Drilling.  The Company began operations as a daywork contract
driller in the Gulf of Mexico and the Texas/Louisiana Gulf Coast region. Because
of depressed conditions in the domestic oil and gas industry during the 1980s
and early 1990s, the Company sold certain drilling rigs and deployed its
remaining rigs into selected international markets. These strategic decisions
were made to enable the Company to stabilize cash flows during an extended
market downturn. The Company currently has an established base of term contracts
in both drilling and production operations. The Company currently operates 8
land rigs in Venezuela, 8 jack-up rigs in the Gulf of Mexico, 2 jack-up rigs in
each of Venezuela and Qatar and one jack-up rig in each of Trinidad and Mexico.
In addition, the Company recently exercised an option to purchase a platform
drilling rig which is currently operating in Brazil. Of the Company's 14 jack-up
rigs currently operated, 13 are cantilevered, 7 have top drives and
substantially all have been refurbished in the last five years.
 
     Engineering Services.  Turnkey drilling has been a key element in the
Company's long-term strategy since 1982. The Company believes that its downhole
engineering expertise, extensive operating experience, veteran personnel and
risk management capabilities have allowed the Company to reduce the risks
inherent in turnkey drilling operations. From 1982 through June 30, 1997, the
Company completed 277 turnkey drilling contracts with aggregate revenues of
$738.9 million, direct income before depreciation and allocated overhead of
$100.2 million and operating income of $70.3 million. The Company also began
providing well engineering and management services during 1993 as an expansion
of this business segment. Under these arrangements, the Company is responsible
for well design and well site supervision.
 
     MOPU Operations.  Since 1989, the Company has pioneered the development and
operation of MOPUs, which allow the Company to participate in the more stable
oil and gas production market. MOPUs are offshore production systems, usually
converted jack-up rigs, from which the drilling equipment is removed and
production equipment is installed. MOPUs generally are contracted on a term
basis for several years and are characterized by relatively high operating
margins, with most of the costs assumed by the customer. The Company currently
owns 5 MOPUs capable of operating in both domestic and foreign waters. Of the 5
MOPUs owned by the Company, 3 are currently working in the Gulf of Mexico and 2
are working internationally. Two of the MOPUs, the LANGLEY and CLIFFS DRILLING
10, are under term bareboat charters, pursuant to which the charterers have an
option to purchase the respective rigs at certain times and under certain
conditions.
 
     The Company is a Delaware corporation with principal executive offices
located at 1200 Smith Street, Suite 300, Houston, Texas 77002 and its telephone
number is (713) 651-9426.
                                        7
<PAGE>   9
 
                             THE PRIVATE PLACEMENT
 
     The Old Notes were sold by the Company on August 7, 1997 to the Initial
Purchasers and were thereupon offered and sold by the Initial Purchasers only to
certain qualified institutional buyers. The net proceeds to the Company from the
sale of the Old Notes was approximately $53.2 million, after deducting expenses.
The Company has used approximately $6 million of the net proceeds to acquire
substantially all of the remaining 50% interest of a Trinidad and Tobago joint
venture (the "WINDJV"), which owns the jackup drilling rig SOUTHWESTERN MARINE
4, approximately $5.7 million to repay indebtedness owed by the WINDJV, and
approximately $4.3 million to purchase a platform drilling rig in Brazil which
was previously leased by the Company. The Company intends to use the remainder
of the net proceeds from the sale of the Old Notes to acquire additional assets,
refurbish and renovate a portion of its existing rig fleet and for other general
corporate purposes. See "Capitalization."
 
                               THE EXCHANGE OFFER
 
     The Exchange Offer relates to the exchange of up to $50,000,000 principal
amount of Exchange Notes for up to $50,000,000 principal amount of Old Notes.
The form and terms of the Exchange Notes are identical in all material respects
to the form and terms of the Old Notes except that the Exchange Notes have been
registered under the Securities Act and will not contain certain transfer
restrictions and hence are not entitled to the benefits of the Registration
Rights Agreement relating to the contingent increases in the interest rate
provided for pursuant thereto. The Exchange Notes will evidence the same debt as
the Old Notes and will be issued under and be entitled to the benefits of the
Indenture governing the Old Notes. See "Description of Exchange Notes."
 
The Exchange Offer.........  Each $1,000 principal amount of Exchange Notes will
                               be issued in exchange for each $1,000 principal
                               amount of outstanding Old Notes. As of the date
                               hereof, $50,000,000 principal amount of Old Notes
                               are issued and outstanding. The Company will
                               issue the Exchange Notes to tendering holders of
                               Old Notes on or promptly after the Expiration
                               Date.
 
Resale.....................  The Company believes that the Exchange Notes issued
                               pursuant to the Exchange Offer generally will be
                               freely transferable by the holders thereof
                               without registration or any prospectus delivery
                               requirement under the Securities Act, except for
                               certain Restricted Holders who may be required to
                               deliver copies of this Prospectus in connection
                               with any resale of the Exchange Notes issued in
                               exchange for such Old Notes. See "The Exchange
                               Offer -- General" and "Plan of Distribution."
 
   
Expiration Date............  5:00 p.m., New York City time, on December 16,
                               1997, unless the Exchange Offer is extended, in
                               which case the term "Expiration Date" means the
                               latest date to which the Exchange Offer is
                               extended. See "The Exchange Offer -- Expiration
                               Date; Extensions; Amendments."
    
 
Interest on the Notes......  The Notes bear interest payable semi-annually on
                               May 15 and November 15 of each year, commencing
                               November 15, 1997. Holders of Old Notes of record
                               on November 1, 1997 will receive interest on
                               November 15, 1997 from the date of issuance of
                               the Old Notes, August 7, 1997. Holders of
                               Exchange Notes of record on May 1, 1998 will
                               receive interest on May 15, 1998 from the date of
                               issuance of the Exchange Notes, plus an amount
                               equal to the accrued interest on the Old Notes
                               from the date of the last interest payment,
                               November 15, 1997, to the date of exchange
                               thereof. Consequently, holders who exchange their
                               Old Notes for Exchange Notes will receive the
                               same
                                        8
<PAGE>   10
 
                               interest payment on May 15, 1998 that they would
                               have received had they not accepted the Exchange
                               Offer. Interest on the Old Notes accepted for
                               exchange will cease to accrue upon issuance of
                               the Exchange Notes. See "The Exchange
                               Offer -- Interest on the Exchange Notes."
 
Procedures for Tendering
Old Notes..................  Each holder of Old Notes wishing to accept the
                               Exchange Offer must complete, sign and date the
                               Letter of Transmittal, or a facsimile thereof, in
                               accordance with the instructions contained herein
                               and therein, and mail or otherwise deliver such
                               Letter of Transmittal, or such facsimile,
                               together with the Old Notes to be exchanged and
                               any other required documentation to the Exchange
                               Agent at the address set forth herein and therein
                               or effect a tender of Old Notes pursuant to the
                               procedures for book-entry transfer as provided
                               for herein. See "The Exchange Offer -- Procedures
                               for Tendering."
 
Special Procedures for
Beneficial Holders.........  Any beneficial holder whose Old Notes are
                               registered in the name of a broker, dealer,
                               commercial bank, trust company or other nominee
                               and who wishes to tender in the Exchange Offer
                               should contact such registered holder promptly
                               and instruct such registered holder to tender on
                               the beneficial holder's behalf. If such
                               beneficial holder wishes to tender directly, such
                               beneficial holder must, prior to completing and
                               executing the Letter of Transmittal and
                               delivering the Old Notes, either make appropriate
                               arrangements to register ownership of the Old
                               Notes in such holder's name or obtain a properly
                               completed bond power from the registered holder.
                               The transfer of record ownership may take
                               considerable time. See "The Exchange
                               Offer -- Procedures for Tendering."
 
Guaranteed Delivery
  Procedures...............  Holders of Old Notes who wish to tender their Old
                               Notes and whose Old Notes are not immediately
                               available or who cannot deliver their Old Notes
                               and a properly completed Letter of Transmittal or
                               any other documents required by the Letter of
                               Transmittal to the Exchange Agent prior to the
                               Expiration Date, or who cannot complete the
                               procedure for book-entry transfer on a timely
                               basis, may tender their Old Notes according to
                               the guaranteed delivery procedures set forth in
                               "The Exchange Offer -- Guaranteed Delivery
                               Procedures."
 
Withdrawal Rights..........  Tenders of Old Notes may be withdrawn at any time
                               prior to 5:00 p.m., New York City time, on the
                               business day prior to the Expiration Date, unless
                               previously accepted for exchange. See "The
                               Exchange Offer -- Withdrawal of Tenders."
 
Termination of the Exchange
  Offer....................  The Company may terminate the Exchange Offer if it
                               determines that the Exchange Offer violates any
                               applicable law or interpretation of the staff of
                               the SEC. Holders of Old Notes will have certain
                               rights against the Company under the Registration
                               Rights Agreement should the Company fail to
                               consummate the Exchange Offer. See "The Exchange
                               Offer -- Termination" and "Registration Rights
                               Agreement."
                                        9
<PAGE>   11
 
Acceptance of Old Notes and
  Delivery of Exchange
  Notes....................  Subject to certain conditions (as summarized above
                               in "Termination of the Exchange Offer" and
                               described more fully in "The Exchange
                               Offer -- Termination"), the Company will accept
                               for exchange any and all Old Notes which are
                               properly tendered in the Exchange Offer prior to
                               5:00 p.m., New York City time, on the Expiration
                               Date. The Exchange Notes issued pursuant to the
                               Exchange Offer will be delivered promptly
                               following the Expiration Date. See "The Exchange
                               Offer -- General."
 
Exchange Agent.............  State Street Bank and Trust Company is serving as
                               exchange agent (the "Exchange Agent") in
                               connection with the Exchange Offer. The mailing
                               address of the Exchange Agent is State Street
                               Bank and Trust Company, Corporate Trust
                               Department, P.O. Box 778, Boston, Massachusetts
                               02102-0078. Hand deliveries and deliveries by
                               overnight courier should be addressed to State
                               Street Bank and Trust Company, Corporate Trust
                               Department, Fourth Floor, Two International
                               Place, Boston, Massachusetts 02110. For
                               information with respect to the Exchange Offer,
                               the telephone number for the Exchange Agent is
                               (800) 531-0368 or (617) 664-5314 and the
                               facsimile number for the Exchange Agent is (617)
                               664-5232. See "The Exchange Offer -- Exchange
                               Agent."
 
Certain Tax Consequences...  The exchange pursuant to the Exchange Offer will
                               generally not be a taxable event for federal
                               income tax purposes. See "Certain Federal Income
                               Tax Considerations."
 
Use of Proceeds............  There will be no cash proceeds payable to the
                               Company from the issuance of the Exchange Notes
                               pursuant to the Exchange Offer. See "Use of
                               Proceeds." For a discussion of the use of the net
                               proceeds received by the Company from the sale of
                               the Old Notes, see "Private Placement."
 
                 TERMS OF THE OLD NOTES AND THE EXCHANGE NOTES
 
Securities Offered.........  $50 million principal amount of 10.25% Senior Notes
                               due 2003.
 
Maturity Date..............  May 15, 2003.
 
Interest Rate and Payment
  Dates....................  The Notes will bear interest at a rate of 10.25%
                               per annum. Interest on the Notes will accrue from
                               the date of issuance thereof and will be payable
                               semi-annually in cash in arrears on May 15 and
                               November 15 of each year, commencing November 15,
                               1997.
 
Optional Redemption........  The Notes will be redeemable at the option of the
                               Company, in whole or in part, at any time on or
                               after May 15, 2000, at the redemption prices set
                               forth herein, together with accrued and unpaid
                               interest to the date of redemption. In the event
                               the Company consummates a Public Equity Offering
                               on or prior to May 15, 1999, the Company may at
                               its option use all or a portion of the proceeds
                               from such offering to redeem up to $12.5 million
                               principal amount of the Notes at a redemption
                               price equal to 110% of the aggregate principal
                               amount thereof, together with accrued and unpaid
                               interest to the date of redemption, provided that
                               at least $37.5 million in aggregate principal
                                       10
<PAGE>   12
 
                               amount of Notes remain outstanding immediately
                               after such redemption. See "Description of the
                               Notes -- Redemption."
 
Change of Control..........  Upon the occurrence of a Change of Control, each
                               holder of Notes will have the right to require
                               the Company to purchase all or a portion of such
                               holder's Notes at a price equal to 101% of the
                               aggregate principal amount thereof, together with
                               accrued and unpaid interest to the date of
                               purchase. See "Description of the
                               Notes -- Certain Covenants -- Change of Control."
 
Certain Covenants..........  The Indenture relating to the Notes contains
                               certain covenants, including covenants which
                               limit: (i) indebtedness; (ii) restricted
                               payments; (iii) issuances and sales of capital
                               stock of restricted subsidiaries; (iv)
                               sale/leaseback transactions; (v) transactions
                               with affiliates; (vi) liens; (vii) asset sales;
                               (viii) dividends and other payment restrictions
                               affecting restricted subsidiaries; (ix) conduct
                               of business; and (x) mergers, consolidations and
                               sales of assets. See "Description of the
                               Notes -- Certain Covenants" and "-- Merger,
                               Consolidation and Sale of Assets."
 
Guarantees.................  The Notes will be unconditionally guaranteed on a
                               senior unsecured basis by each of the Company's
                               principal subsidiaries, and such Subsidiary
                               Guarantees will rank pari passu in right of
                               payment with all senior Indebtedness of the
                               Subsidiary Guarantors and senior to all
                               Subordinated Indebtedness of the Subsidiary
                               Guarantors. The obligations of the Subsidiary
                               Guarantors under the Notes will rank on a parity
                               with the obligations of the Subsidiary Guarantors
                               under the Company's outstanding 10.25% Senior
                               Notes due 2003, Series B (the "Series B Notes").
                               At August 31, 1997, the Subsidiary Guarantors had
                               no outstanding indebtedness other than the
                               Subsidiary Guarantees of the outstanding Series B
                               Notes and the Old Notes. The Subsidiary
                               Guarantees may be released under certain
                               circumstances. See "Description of the
                               Notes -- Subsidiary Guarantees of Notes."
 
Ranking....................  The Notes will be senior unsecured obligations of
                               the Company, ranking pari passu in right of
                               payment with all senior Indebtedness of the
                               Company, senior to all Subordinated Indebtedness
                               of the Company, and on a parity with the
                               Company's outstanding Series B Notes. The Notes
                               and the Subsidiary Guarantees, however, will be
                               effectively subordinated to secured Indebtedness
                               of the Company and the Subsidiary Guarantors,
                               respectively, with respect to the assets securing
                               such Indebtedness, including any Indebtedness
                               under the Revolving Credit Facility, which is
                               secured by liens on substantially all of the
                               assets of the Company and the Subsidiary
                               Guarantors. Without regard to the $50 million in
                               principal amount of the Old Notes, the Company
                               and the Subsidiary Guarantors had no outstanding
                               indebtedness at August 31, 1997, other than (i)
                               $2.4 million consisting of letters of credit
                               secured by liens on substantially all of the
                               assets of the Company and the Subsidiary
                               Guarantors, which is effectively senior to,
                               although nominally pari passu with, the Notes,
                               and (ii) $150 million in principal amount of the
                               Series B Notes, which ranks pari passu with the
                               Notes. Subject to certain limitations, the
                               Company and its Subsidiaries may incur additional
                               Indebtedness in the future. See "Description of
                               the Notes -- Ranking."
                                       11
<PAGE>   13
 
Transfer Restrictions......  The Old Notes have not been registered under the
                               Securities Act and unless so registered may not
                               be offered or sold except pursuant to an
                               exemption from, or in a transaction not subject
                               to, the registration requirements of the
                               Securities Act. See "Transfer Restrictions on Old
                               Notes." The Exchange Notes would in general be
                               freely tradeable after the Exchange Offer. See
                               "The Exchange Offer" and "Plan of Distribution."
 
Exchange Offer.............  Pursuant to a registration rights agreement (the
                               "Registration Rights Agreement") by and among the
                               Company, the Subsidiary Guarantors and the
                               Initial Purchasers, the Company agreed (i) to
                               file a registration statement with the SEC (the
                               "Exchange Offer Registration Statement") with
                               respect to the Exchange Offer to exchange Old
                               Notes for Exchange Notes within 60 days after the
                               date of original issuance of the Old Notes (which
                               was August 7, 1997) and (ii) to use its best
                               efforts to cause such registration statement to
                               become effective under the Securities Act within
                               120 days after such issue date. The Registration
                               Statement of which this Prospectus is a part
                               constitutes such Exchange Offer Registration
                               Statement. In the event that applicable law or
                               interpretations of the staff of the SEC do not
                               permit the Company to file the Exchange Offer
                               Registration Statement or to effect the Exchange
                               Offer, or if certain holders of the Notes notify
                               the Company that they are not permitted to
                               participate in, or would not receive freely
                               tradeable Notes pursuant to, the Exchange Offer,
                               the Company will use its best efforts to cause to
                               become effective a registration statement (the
                               "Shelf Registration Statement") with respect to
                               the resale of the Notes and to keep the Shelf
                               Registration Statement effective until two years
                               after the date of original issuance of the Notes.
                               The interest rate on the Notes is subject to
                               increase under certain circumstances if the
                               Company is not in compliance with its obligations
                               under the Registration Rights Agreement. See
                               "Registration Rights Agreement."
 
                                  RISK FACTORS
 
     An investment in the Notes involves certain risks that a potential investor
should carefully evaluate prior to making an investment in the Notes. See "Risk
Factors."
                                       12
<PAGE>   14
 
                 SUMMARY HISTORICAL CONSOLIDATED FINANCIAL DATA
 
              (IN THOUSANDS, EXCEPT RATIOS AND PER SHARE AMOUNTS)
 
     The following table sets forth selected historical consolidated financial
information of the Company and should be read in conjunction with the
Consolidated Financial Statements of the Company, including the notes thereto,
and Management's Discussion and Analysis of Financial Condition and Results of
Operations, incorporated by reference herein.
 
<TABLE>
<CAPTION>
                                                                       YEAR ENDED             SIX MONTHS ENDED
                                                                      DECEMBER 31,                JUNE 30,
                                                              ----------------------------   -------------------
                                                               1994      1995       1996       1996       1997
                                                              -------   -------   --------   --------   --------
<S>                                                           <C>       <C>       <C>        <C>        <C>
SUMMARY OF OPERATIONS:
Revenues....................................................  $83,693   $83,289   $133,109   $ 42,856   $121,346
Costs and Expenses:
  Operating Expenses........................................   50,907    67,713     91,984     30,073     71,885
  Depreciation, Depletion and Amortization..................   14,008     7,271     10,388      3,177      8,359
  Contract Termination Provision............................    5,193        --         --         --         --
  General and Administrative Expense........................    5,114     5,289      6,300      2,814      4,159
                                                              -------   -------   --------   --------   --------
Operating Income............................................    8,471     3,016     24,437      6,792     36,943
Other Income (Expense)(1)...................................   (2,415)    2,430    (10,015)    (1,107)   (16,357)
                                                              -------   -------   --------   --------   --------
Net Income..................................................    6,056     5,446     14,422      5,685     20,586
Dividends Applicable to Preferred Stock(2)..................   (2,659)   (2,659)       (31)       (31)        --
                                                              -------   -------   --------   --------   --------
Net Income Applicable to Common and Common Equivalent
  Shares....................................................  $ 3,397   $ 2,787   $ 14,391   $  5,654   $ 20,586
                                                              =======   =======   ========   ========   ========
Net Income Per Share(3).....................................  $  0.40   $  0.34   $   1.04   $   0.44   $   1.34
                                                              =======   =======   ========   ========   ========
Weighted Average Number of Common and Common Equivalent
  Shares Outstanding(2)(3)..................................    8,446     8,216     13,852     12,726     15,365
</TABLE>
 
<TABLE>
<CAPTION>
                                                                  AT DECEMBER 31, 1996        AT JUNE 30, 1997
                                                              ----------------------------   -------------------
<S>                                                           <C>                            <C>        
SUMMARY BALANCE SHEET DATA:
Cash and Cash Equivalents...................................            $ 39,181                  $  2,702
Other Working Capital.......................................              29,040                   33,314
Property and Equipment, Net.................................             216,474                   282,456
Total Assets................................................             339,546                   372,627
10.25% Senior Notes.........................................             150,000                   150,000
Total Shareholders' Equity(2)(4)............................            $142,168                  $163,311
</TABLE>
 
<TABLE>
<CAPTION>
                                                                       YEAR ENDED             SIX MONTHS ENDED
                                                                      DECEMBER 31,                JUNE 30,
                                                              ----------------------------   -------------------
                                                               1994      1995       1996       1996       1997
                                                              -------   -------   --------   --------   --------
<S>                                                           <C>       <C>       <C>        <C>        <C>
OTHER NON-GAAP FINANCIAL DATA:
EBITDA(5)...................................................  $26,873   $15,322   $ 41,071   $ 13,509   $ 47,816
Capital Expenditures........................................  $ 9,100   $13,437   $144,504   $118,621   $ 76,341
Ratio of EBITDA to Total Interest(6)........................     32.5x     77.0x       4.1x       7.5x       5.8x
Ratio of Earnings to Fixed Charges(6).......................      8.7x     31.8x       3.0x       5.6x       4.7x
</TABLE>
 
- ---------------
 
(1) Includes items of other income and expense, interest expense and income
    taxes. Includes net exchange rate losses of $1.2 million in 1994, net gains
    on disposition of assets of $2.7 million and net exchange rate gains of $2.6
    million in 1995, net gains on disposition of assets of $3.7 million in 1996
    and net gains on disposition of assets of $2.6 million and $2.5 million in
    the first six months of 1996 and 1997, respectively.
 
(2) On January 17, 1996, the Company issued 2,113,557 shares of Common Stock,
    before effects of the Stock Split (as defined), upon conversion of 1,115,988
    shares of its 1,150,000 outstanding shares of $2.3125 Convertible
    Exchangeable Preferred Stock (the "Preferred Stock"). The remaining 34,012
    shares were redeemed for cash in the amount of $25.69 per share plus $0.22
    per share in accrued dividends thereon at a cost to the Company of
    approximately $.9 million.
 
(3) On June 9, 1997, the Company effected a two-for-one stock split in the form
    of a 100% stock dividend to holders of record on May 22, 1997 (the "Stock
    Split"). All references to the weighted average number of common and common
    equivalent shares outstanding and per share amounts have been restated to
    reflect the Stock Split, unless otherwise indicated.
 
(4) The Company has not paid any cash dividends on its Common Stock.
 
(5) EBITDA represents net income before depreciation, depletion, amortization,
    contract termination provision, interest expense and income taxes. Although
    EBITDA is not a measurement presented in accordance with generally accepted
    accounting principles ("GAAP"), EBITDA is frequently used by securities
    analysts and is presented here to provide additional information about the
    Company's operations. The Company believes that EBITDA may provide
    additional information about the Company's ability to meet future
    requirements for debt service, capital expenditures and working capital,
    although such future cash outlays are not included in the determination of
    EBITDA. The amount of and trends in EBITDA should not be considered as an
    alternative to net income as a measure of operating results or as an
    alternative to operating cash flows as a better measure of liquidity.
    Because EBITDA includes some, but not all, items that affect net income, and
    its computation may vary among companies, the EBITDA calculation presented
    above may not be comparable to similarly titled measures of other companies.
 
(6) For purposes of these calculations, earnings consist of income before income
    taxes plus fixed charges, excluding capitalized interest. Total interest
    consists of interest expense plus capitalized interest. Fixed charges
    consist of interest expense, including capitalized interest, and a portion
    of rent considered to represent interest cost.
                                       13
<PAGE>   15
 
                                  RISK FACTORS
 
     In addition to the other information set forth elsewhere in this Prospectus
and the documents incorporated herein by reference, the following factors should
be carefully evaluated prior to making an investment in the Notes:
 
RELIANCE ON OIL AND GAS INDUSTRY
 
     Demand for the Company's services depends primarily upon the level of
spending by oil and gas companies for exploration, development and production
activities. Activity in the contract drilling industry and related oil service
businesses was severely depressed from 1982 until 1992 due to volatility in oil
prices and depressed natural gas prices. As demonstrated during this period, any
prolonged reduction in oil and natural gas prices will depress the level of
exploration, development and production activity and result in a corresponding
decline in the demand for the Company's services and, therefore, have a material
adverse effect on the Company's revenues and profitability. It is not possible
to predict whether contract drilling rig utilization and dayrates will maintain
levels sufficient to ensure acceptable operating results in future periods. The
Company's future success will depend in part upon general economic conditions in
the oil and gas industry, which cannot be predicted with certainty.
 
     The contract drilling industry is a highly competitive and cyclical
business characterized by high capital and maintenance costs. The Company has
many competitors in all of the regions in which it operates, some of which have
substantially greater financial and other resources than the Company.
 
SUBSTANTIAL INDEBTEDNESS AND RESTRICTIONS
 
     The Company has substantial indebtedness. Without regard to the $50 million
in principal amount of the Old Notes, at August 31, 1997, the Company had $152.4
million of outstanding indebtedness, consisting of (i) $2.4 million in
outstanding letters of credit secured by liens on substantially all of the
assets of the Company and the Subsidiary Guarantors, which is effectively senior
to, although nominally pari passu with, the Notes, and (ii) $150 million in
principal amount of the Series B Notes, which ranks pari passu with the Notes.
The Company's level of indebtedness will have several important effects on its
future operations, including (i) a substantial portion of the Company's cash
flow from operations must be dedicated to the payment of interest on its
indebtedness and will not be available for other purposes, (ii) covenants
contained in the Indenture relating to the Notes (the "Indenture"), the Series
A/B Indenture (as defined) or the Revolving Credit Facility will require the
Company to meet certain financial tests, and other restrictions will limit its
ability to borrow additional funds or to dispose of assets and may affect the
Company's flexibility in planning for, and reacting to, changes in its business,
including possible acquisition activities, and (iii) the Company's ability to
obtain additional financing in the future for working capital, capital
expenditures, acquisitions, general corporate or other purposes may be impaired.
The Company's ability to meet its debt service obligations and to reduce its
total indebtedness will be dependent upon the Company's future performance,
which will be subject to general economic conditions and to financial, business
and other factors affecting the operations of the Company, many of which are
beyond its control. There can be no assurance that the Company's business will
continue to generate cash flow at or above current levels. If the Company is
unable to generate sufficient cash flow from operations in the future to service
its debt, it may be required to refinance all or a portion of its Indebtedness,
including the Notes, or to obtain additional financing. There can be no
assurance that any such refinancing would be possible or that any additional
financing could be obtained.
 
EFFECTIVE SUBORDINATION
 
     The Company has established a Revolving Credit Facility pursuant to which
it may currently borrow up to $35 million on a revolving credit basis. The
Revolving Credit Facility is secured by liens on substantially all of the assets
of the Company and the Subsidiary Guarantors. Accordingly, the lender under the
Revolving Credit Facility will have claims with respect to the assets
constituting collateral for any Indebtedness thereunder that will be prior to
the claims of holders of the Notes. See "Description of Existing Indebtedness."
In the event of a default on the Notes, or a bankruptcy, liquidation or
reorganization of the Company,
 
                                       14
<PAGE>   16
 
such assets will be available to satisfy obligations with respect to the
Indebtedness secured thereby before any payment therefrom could be made on the
Notes. Thus, the Notes and the Subsidiary Guarantees will be effectively
subordinated to claims of the lender under the Revolving Credit Facility to the
extent of such pledged collateral. As of August 31, 1997, no Indebtedness was
outstanding under the Revolving Credit Facility.
 
REPURCHASE OF NOTES UPON A CHANGE OF CONTROL OR ASSET SALES
 
     Upon the occurrence of a Change of Control, the Company must offer to
purchase all Notes then outstanding at a purchase price equal to 101% of the
principal amount thereof plus accrued and unpaid interest to the date of
purchase. In addition, upon the occurrence of a Change of Control, the Company
must offer to purchase all Series B Notes then outstanding at a purchase price
equal to 101% of the principal amount thereof plus accrued and unpaid interest
to the date of purchase. In the event of certain sales or dispositions of
assets, the Company may be required under certain limited circumstances to use
the Excess Proceeds (as defined) to effect a Net Proceeds Offer (as defined).
See "Description of the Notes -- Certain Covenants -- Change of
Control; -- Limitation on Asset Sales."
 
     The events that constitute a Change of Control or require a Net Proceeds
Offer under the Indenture may result in lenders under the Revolving Credit
Facility having the right to require the Company to repay all Indebtedness
outstanding thereunder. There can be no assurance that the Company will have
available funds sufficient to repay all Indebtedness owing under the Revolving
Credit Facility, to fund the purchase of the Notes or the Series B Notes upon a
Change of Control or to make a Net Proceeds Offer. In the event a Change of
Control occurs at a time when the Company does not have available funds
sufficient to pay for all of the Notes delivered by Holders seeking to accept
the Company's repurchase offer, an Event of Default would occur under the
Indenture.
 
OPERATING HISTORY AND WORKING CAPITAL NEEDS
 
     The Company was not profitable from 1988 through 1991 as a result of
depressed economic conditions in the oil and gas and oilfield service
industries. To the extent that cash in excess of cash on hand and cash generated
from operations is needed in the near term for working capital and capital
expenditures, it is expected that the Company would draw on the Revolving Credit
Facility or seek other debt or equity financing in the private or public
markets. Additional liquidity might also be generated through the sale of
operating assets or through the reduction of capital expenditures, although any
such sale or reduction may have an adverse effect on the Company's results of
operations. The ability of the Company to sell debt or equity securities or
assets would depend on conditions then prevailing in the relevant market and, in
the case of any offering of debt or equity securities, the Company's results of
operations, financial condition and business prospects. There can be no
assurance that the Company could, if the need arose, effect any such sale of
debt or equity securities or assets on terms that were acceptable to the
Company. In addition, the Indenture limits the ability of the Company to incur
additional Indebtedness or to enter into mergers, asset sales or consolidations.
See "Description of the Notes -- Certain Covenants" and "-- Merger,
Consolidation and Sale of Assets."
 
RISKS ASSOCIATED WITH TURNKEY DRILLING
 
     Under a turnkey drilling contract, the Company contracts to drill a well to
a contract depth under specified conditions for a fixed price. In addition, the
Company provides technical expertise and engineering services, as well as most
of the equipment required for the well, and is compensated when the contract
terms have been satisfied. On a turnkey well, the Company from time to time
operates rigs subcontracted from other drilling contractors on a dayrate basis.
The Company also subcontracts substantially all of the related services and
manages the drilling process. The risks to the Company on a turnkey drilling
contract are substantially greater than on a well drilled on a daywork basis
because the Company assumes most of the risks associated with drilling
operations generally assumed by the operator in a daywork contract, including
risk of blowout, loss of hole, stuck drill stem, lost production or damage to
the reservoir, machinery breakdowns, abnormal drilling conditions and risks
associated with subcontractors' services, supplies and personnel. The Company
has obtained insurance coverage in the past to reduce these risks inherent in
turnkey drilling operations.
 
                                       15
<PAGE>   17
 
Should such coverage not be available in the future, it would have a material
adverse effect on the Company's turnkey drilling operations. See "-- Risks and
Insurance."
 
RISKS AND INSURANCE
 
     The Company's operations are subject to the many hazards inherent in the
drilling business, including, for example, blowouts, cratering, fires,
explosions and adverse weather and seas. These hazards could cause personal
injury, suspend drilling operations or seriously damage or destroy the equipment
involved and could cause substantial damage to producing formations and
surrounding areas. Damage to the environment could also result from the
Company's operations, particularly through oil spillage and extensive,
uncontrolled fires. As a protection against operating hazards, the Company
maintains broad insurance coverage, including all risks physical damage,
employer's liability, comprehensive general liability and workers' compensation
insurance. The Company's third party liability insurance coverage is
approximately $100 million per occurrence. The Company also maintains insurance
coverage on an annual basis to protect against certain hazards inherent in its
turnkey contract drilling and oil and gas operations. This insurance was most
recently renewed on October 1, 1997. The Company believes that it is adequately
insured for public liability and property damage to others with respect to its
operations. However, such insurance may not be sufficient to protect the Company
against liability for all consequences of well disasters, extensive fire damage
or damage to the environment. The Company also carries insurance to cover
physical damage to or loss of its drilling rigs and MOPUs. In view of
difficulties that may be encountered in renewing such insurance at reasonable
rates, no assurance can be given that the Company will be able to maintain the
type and amount of coverage that it considers adequate. The occurrence of a
significant event for which the Company is not fully insured could have a
material adverse effect on the Company's financial position and results of
operations.
 
RISKS INHERENT IN FOREIGN OPERATIONS
 
     A significant percentage of the Company's revenues is derived from foreign
sources or from services performed abroad. For the fiscal year ended December
31, 1996, 55% of the Company's consolidated revenues was derived from foreign
operations, principally in Venezuela. Foreign operations and export sales are
subject in varying degrees to risks inherent in doing business abroad. Such
risks include the possibility of unfavorable changes in tax or other laws;
partial or total expropriation; currency exchange rate fluctuations and
restrictions on currency repatriation; the disruption of operations from labor
and political disturbances, insurrection or war; and the requirements of partial
local ownership of operations in certain countries. Foreign governments may from
time to time suspend or curtail drilling operations or leasing activities when
such operations are considered to be detrimental to the environment or to
jeopardize public safety.
 
RELIANCE ON SIGNIFICANT CUSTOMERS
 
     The Company's largest customer for the year ended December 31, 1996,
Corpoven, S.A.("Corpoven"), accounted for approximately 31% of the Company's
consolidated revenues. The Company's 3 largest customers for the year ended
December 31, 1995, Corpoven, Maraven, S.A. ("Maraven") and Texaco Exploration &
Production, Inc. accounted for approximately 66% of the Company's consolidated
revenues. The Company's 4 largest customers for the year ended December 31,
1994, Corpoven, Maraven, Dresser-Rand Company and Cliffs Neddrill Central
Turnkey International, a joint venture in which the Company has a 1/3 ownership
interest, accounted for approximately 78% of the Company's consolidated
revenues. The loss of any significant customer could, at least on a short term
basis, have a material adverse impact on the Company's results of operations.
 
GOVERNMENT REGULATION
 
     The drilling of oil and gas wells is subject to various federal, state,
local and foreign laws, rules and regulations. The Company, as an owner or
operator of domestic offshore facilities, may be liable for the costs of removal
and damages arising out of a pollution incident to the extent set forth in the
Federal Water Pollution Control Act, as amended by the U.S. Oil Pollution Act of
1990 ("OPA '90") and the Outer Continental Shelf Lands Act. In addition, the
Company may also be subject to other civil claims arising out of
 
                                       16
<PAGE>   18
 
any such incident. Certain of the Company's facilities are also subject to
regulations of the Environmental Protection Agency ("EPA") that require the
preparation and implementation of spill prevention control and countermeasure
plans relating to possible discharge of oil into navigable waters. The Company
supplements its activities in this regard by membership in the Clean Gulf
Association, which provides pollution control facilities to its members. Other
regulations of the EPA may require the Company to take certain precautions in
storing, handling and transporting certain hazardous wastes. State statutory
provisions relating to oil and natural gas generally include requirements as to
well spacing, waste prevention, production limitations, pollution prevention and
clean-up, obtaining drilling permits and similar matters. The Company believes
that it is in compliance in all material respects with such laws, rules and
regulations and that such compliance has not had any material adverse effect on
its operations or financial condition.
 
     The drilling industry is dependent on the demand for services from the oil
and gas exploration industry and, accordingly, is affected by changing tax laws,
price controls and other laws relating to the energy business. The Company's
business is affected generally by political developments and by federal, state,
local and foreign laws, rules and regulations which may relate directly to the
oil and gas industry. The adoption of laws, rules and regulations, both domestic
and foreign, which curtail exploration and development drilling for oil and gas
for economic, environmental and other policy reasons may adversely affect the
Company's operations by limiting available drilling and production
opportunities.
 
     MOPUs and MOPU operations are subject to certain federal, state, local and
foreign laws, rules and regulations relating to engineering, design, structural,
safety, operational and inspection standards or requirements, and changes in
such standards or requirements could adversely affect the Company's MOPU
operations.
 
FRAUDULENT CONVEYANCE
 
     Various fraudulent conveyance laws enacted for the protection of creditors
may apply to the Subsidiary Guarantors' issuance of the Subsidiary Guarantees.
To the extent that a court were to find that (x) a Subsidiary Guarantee was
incurred by a Subsidiary Guarantor with intent to hinder, delay or defraud any
present or future creditor or the Subsidiary Guarantor contemplated insolvency
with a design to prefer one or more creditors to the exclusion in whole or in
part of others or (y) a Subsidiary Guarantor did not receive fair consideration
or reasonably equivalent value for issuing its Subsidiary Guarantee and such
Subsidiary Guarantor (i) was insolvent, (ii) was rendered insolvent by reason of
the issuance of such Subsidiary Guarantee, (iii) was engaged or about to engage
in a business or transaction for which the remaining assets of such Subsidiary
Guarantor constituted unreasonably small capital to carry on its business or
(iv) intended to incur, or believed that it would incur, debts beyond its
ability to pay such debts as they matured, the court could avoid or subordinate
such Subsidiary Guarantee in favor of the Subsidiary Guarantor's creditors.
Among other things, a legal challenge of a Subsidiary Guarantee on fraudulent
conveyance grounds may focus on the benefits, if any, realized by the Subsidiary
Guarantor as a result of the issuance by the Company of the Notes. The Indenture
contains a savings clause, which generally limits the obligations of each
Subsidiary Guarantor under its Subsidiary Guarantee to the maximum amount as
will, after giving effect to all of the liabilities of such Subsidiary
Guarantor, result in such obligations not constituting a fraudulent conveyance.
To the extent a Subsidiary Guarantee of any Subsidiary Guarantor was avoided as
a fraudulent conveyance or held unenforceable for any other reason, holders of
the Notes would cease to have any claim against such Subsidiary Guarantor and
would be creditors solely of the Company and any Subsidiary Guarantor whose
Subsidiary Guarantee was not avoided or held unenforceable. In such event, the
claims of the holders of the Notes against the issuer of an invalid Subsidiary
Guarantee would be subject to the prior payment of all liabilities of such
Subsidiary Guarantor. There can be no assurance that, after providing for all
prior claims, there would be sufficient assets to satisfy the claims of the
holders of the Notes relating to any avoided portions of any of the Subsidiary
Guarantees.
 
     The measure of insolvency for purposes of the foregoing considerations will
vary depending upon the law applied in any such proceeding. Generally, however,
a Subsidiary Guarantor may be considered insolvent if the sum of its debts,
including contingent liabilities, was greater than the fair marketable value of
all of its assets at a fair valuation or if the present fair marketable value of
its assets was less than the amount that
 
                                       17
<PAGE>   19
 
would be required to pay its probable liability on its existing debts, including
contingent liabilities, as they become absolute and mature.
 
     Based upon financial and other information, the Company and the Subsidiary
Guarantors believe that the Subsidiary Guarantees are being incurred for proper
purposes and in good faith and that the Company and each Subsidiary Guarantor is
solvent and will continue to be solvent after issuing its Subsidiary Guarantee,
will have sufficient capital for carrying on its business after such issuance
and will be able to pay its debts as they mature. There can be no assurance,
however, that a court passing on such standards would agree with the Company.
See "Description of the Notes -- Subsidiary Guarantees of Notes."
 
ABSENCE OF A PUBLIC MARKET FOR THE EXCHANGE NOTES
 
     The Exchange Notes will constitute a new issue of securities with no
established trading market, and there can be no assurance as to the liquidity of
any markets that may develop for the Exchange Notes or, the ability or price at
which the holders of Exchange Notes would be able to sell their Exchange Notes.
Future trading prices of the Exchange Notes will depend on many factors,
including, among others, prevailing interest rates, the Company's operating
results and the market for similar securities. The Company does not intend to
apply for listing of the Exchange Notes on any securities exchange or to seek
admission thereof to trading in the National Association of Securities Dealers
Automated Quotation System. The Initial Purchasers have informed the Company
that they currently intend to make a market for the Exchange Notes. However,
they are not so obligated, and any such market making may be discontinued at any
time without notice. In addition, such market making activity will be subject to
the limits imposed by the Securities Act and the Exchange Act and may be limited
during the Exchange Offer or the pendency of the Shelf Registration Statement.
Accordingly, no assurance can be given that an active public or other market
will develop for the Exchange Notes or as to the liquidity of or the trading
market for the Exchange Notes.
 
CONSEQUENCES OF FAILURE TO EXCHANGE
 
     Untendered Old Notes not exchanged for Exchange Notes pursuant to the
Exchange Offer will remain subject to the existing restrictions upon transfer of
such Old Notes. See "Transfer Restrictions on Old Notes." Because the Company
anticipates that most holders of Old Notes will elect to exchange such Old Notes
for Exchange Notes due to the general lack of restrictions on the resale of
Exchange Notes under the Securities Act, the Company anticipates that the
liquidity of the market for any Old Notes remaining after the consummation of
the Exchange Offer may be substantially limited. Additionally, holders (other
than Restricted Holders) of any Old Notes not tendered in the Exchange Offer
prior to the Expiration Date will not be entitled to require the Company to file
the Shelf Registration Statement and the stated interest rate on such Old Notes
will remain at its initial level of 10.25%. See "Registration Rights Agreement."
 
DIFFICULTY TO EFFECT A CHANGE IN CONTROL
 
     The Company's Certificate of Incorporation and Bylaws and the provisions of
the Delaware General Corporation Law limit the liability of directors and make
it more difficult to change control of the Company and replace incumbent
management. Also, the Indenture requires the Company to offer to redeem the
Notes upon a change of control (as defined therein). See "Description of the
Notes -- Certain Covenants -- Change of Control."
 
                                       18
<PAGE>   20
 
                                  THE COMPANY
 
     Cliffs Drilling Company is an international contract drilling and
engineering company. The Company is primarily engaged in daywork drilling,
engineering services, and to a lesser extent, the development and operation of
mobile offshore production units. The Company has historically deployed its
assets in areas where it can achieve long-term growth and generate stable cash
flows and net income. This strategy has led to five consecutive years of
positive net income. The Company's domestic operations are concentrated in the
Texas/ Louisiana Gulf Coast region and its foreign operations are concentrated
in Venezuela and the Middle East. The Company owns 14 jack-up drilling rigs, 1
platform drilling rig, 11 land rigs and 5 MOPUs.
 
     The Company and its predecessors have been in the contract drilling
business since 1978. The Company entered the turnkey drilling business in 1982
in an effort to more fully utilize its existing fleet of rigs and complement its
daywork drilling operations. In response to the economic conditions which
adversely affected the domestic contract drilling business during the 1980s, the
Company undertook a strategic plan in 1989 to further diversify its scope of
operations and geographic concentration beyond the traditional domestic daywork
drilling market. The Company's management implemented a proactive approach to
identify, develop and exploit several market segments which provided higher
margins and more reliable operating income and cash flow. To achieve its
strategic objectives, the Company continued to emphasize its turnkey drilling
operations, expanded its well engineering and management services, became a
leader in the development and operation of MOPUs and deployed its drilling rigs
into selected international markets. With the implementation of this strategy,
the Company has positioned itself to benefit from increases in drilling and
production activities in several markets worldwide.
 
INDUSTRY CONDITIONS
 
     Activity in the contract drilling industry and related oil service
businesses has improved over the last two years due to increased worldwide
demand for oil and natural gas. Over the past several years, the supply of
offshore drilling rigs has declined while the demand for such rigs has
increased, resulting in the highest utilization rates since 1985. In addition,
oil and gas companies have experienced decreases in exploration and production
costs from technological advances such as increased use of 3-D seismic surveys,
advances in drill bits and completion technologies and use of new production
techniques such as MOPUs and subsea completions. In an effort to more quickly
realize the significant gas revenues attainable from shallow water drilling in
the Gulf of Mexico, oil and gas companies are producing reserves at faster
rates. These enhanced production methods increase the net present value of the
reserves produced and significantly shorten the reserve life in the Gulf of
Mexico, thereby necessitating additional drilling. In addition, the U.S. natural
gas market has improved after experiencing weak market conditions throughout the
early 1990s. All of these factors have resulted in increased demand for offshore
drilling rigs and an increase in both utilization and dayrates for jack-up
drilling rigs. Management believes the current market dynamics in the Gulf of
Mexico, South America, the Middle East and other international areas will result
in greater utilization of the Company's rigs and services.
 
COMPANY STRATEGY
 
     The Company's management has adopted a proactive approach to identify,
develop and exploit 3 market segments which the Company believes provide higher
margins and reliable operating income and cash flow. In addition, the Company
has sought to identify business opportunities that would expand its asset base,
increase profitability and enhance shareholder value. The Company's acquisition
criteria include, among others, transactions designed to increase operating
leverage and diversify geographically. The Company's 3 primary business segments
are daywork drilling, engineering services and MOPU operations.
 
     Daywork Drilling.  The Company began operations as a daywork contract
driller in the Gulf of Mexico and the Texas/Louisiana Gulf Coast region. Because
of depressed conditions in the domestic oil and gas industry during the 1980s
and early 1990s, the Company sold certain drilling rigs and deployed its
remaining rigs into selected international markets. These strategic decisions
were made to enable the Company to stabilize cash flows during an extended
market downturn. The Company currently has an established base of
 
                                       19
<PAGE>   21
 
term contracts in both drilling and production operations. The Company currently
operates 8 land rigs in Venezuela, 8 jack-up rigs in the Gulf of Mexico, 2
jack-up rigs in each of Venezuela and Qatar and one jack-up rig in each of
Trinidad and Mexico. In addition, the Company recently exercised an option to
purchase a platform drilling rig which is currently operating in Brazil. Of the
Company's 14 jack-up rigs currently operated, 13 are cantilevered, 7 have top
drives and substantially all have been refurbished in the last five years.
 
     Engineering Services.  Turnkey drilling has been a key element in the
Company's long-term strategy since 1982. The Company believes that its downhole
engineering expertise, extensive operating experience, veteran personnel and
risk management capabilities have allowed the Company to reduce the risks
inherent in turnkey drilling operations. From 1982 through June 30, 1997, the
Company completed 277 turnkey drilling contracts with aggregate revenues of
$738.9 million, direct income before depreciation and allocated overhead of
$100.2 million and operating income of $70.3 million. The Company also began
providing well engineering and management services during 1993 as an expansion
of this business segment. Under these arrangements, the Company is responsible
for well design and well site supervision.
 
     MOPU Operations.  Since 1989, the Company has pioneered the development and
operation of MOPUs, which allow the Company to participate in the more stable
oil and gas production market. MOPUs are offshore production systems, usually
converted jack-up rigs, from which the drilling equipment is removed and
production equipment is installed. MOPUs generally are contracted on a term
basis for several years and are characterized by relatively high operating
margins, with most of the costs assumed by the customer. The Company currently
owns 5 MOPUs capable of operating in both domestic and foreign waters. Of the 5
MOPUs owned by the Company, 3 are currently working in the Gulf of Mexico and 2
are working internationally. Two of the MOPUs, the LANGLEY and CLIFFS DRILLING
10, are under term bareboat charters, pursuant to which the charterers have an
option to purchase the respective rigs at certain times and under certain
conditions.
 
     The Company is a Delaware corporation with principal executive offices
located at 1200 Smith Street, Suite 300, Houston, Texas 77002 and its telephone
number is (713) 651-9426.
 
                                       20
<PAGE>   22
 
                               PRIVATE PLACEMENT
 
     On August 7, 1997, the Company completed the private sale to the Initial
Purchasers of $50,000,000 principal amount of the Old Notes at a price of
106.375% of the principal amount thereof in a transaction not registered under
the Securities Act in reliance upon Section 4(2) of the Securities Act. The
Initial Purchasers thereupon offered and resold the Old Notes only to qualified
institutional buyers at an initial price to such purchasers of 107.75% of the
principal amount thereof. The net proceeds to the Company from the sale of the
Old Notes was approximately $53.2 million, after deducting expenses. The Company
has used approximately $6 million of the net proceeds to acquire substantially
all of the remaining 50% interest of the WINDJV, approximately $5.7 million to
repay indebtedness owed by the WINDJV, and approximately $4.3 million to
purchase a platform drilling rig in Brazil which was previously leased by the
Company. The Company intends to use the remainder of the net proceeds from the
sale of the Old Notes to acquire additional assets, refurbish and renovate a
portion of its existing rig fleet and for other general corporate purposes. See
"Capitalization."
 
                                USE OF PROCEEDS
 
     The Company will not receive any cash proceeds from the issuance of the
Exchange Notes offered hereby. In consideration for issuing the Exchange Notes
as contemplated in this Prospectus, the Company will receive in exchange a like
principal amount of Old Notes, the terms of which are identical in all material
respects to the Exchange Notes. The Old Notes surrendered in exchange for the
Exchange Notes will be retired and canceled and cannot be reissued. Accordingly,
issuance of the Exchange Notes will not result in any change in capitalization
of the Company.
 
                                 CAPITALIZATION
 
   
     The following table sets forth as of June 30, 1997 (i) the capitalization
of the Company and (ii) the as adjusted capitalization of the Company after
giving effect to the sale of the Old Notes. The table should be read in
conjunction with "Management's Discussion and Analysis of Financial Condition
and Results of Operations" and the Company's Consolidated Financial Statements,
including the notes thereto, contained in the Company's (i) Annual Report on
Form 10-K/A (Amendment No. 3) for the fiscal year ended December 31, 1996, (ii)
Quarterly Report on Form 10-Q for the three months ended March 31, 1997, and
(iii) Quarterly Report on Form 10-Q for the three months ended June 30, 1997,
incorporated by reference in this Prospectus.
    
 
<TABLE>
<CAPTION>
                                                                  AT JUNE 30, 1997
                                                              -------------------------
                                                                ACTUAL      AS ADJUSTED
                                                              -----------   -----------
                                                                     (UNAUDITED)
                                                                   (IN THOUSANDS,
                                                              EXCEPT SHARE INFORMATION)
<S>                                                           <C>           <C>
Current Portion of Long-Term Debt...........................   $     --      $     --
Long-Term Debt
  10.25% Senior Notes due 2003 (including premium of $3.9
     million, As Adjusted)..................................    150,000       203,875
Shareholders' Equity
  Common Stock, $.01 Par Value, 30,000,000 Shares
     Authorized, 15,663,593 Shares Issued and 15,239,973
     Shares Outstanding for Actual and As Adjusted,
     Respectively...........................................        157           157
Paid-in Capital.............................................    156,693       156,693
Retained Earnings...........................................     14,869        14,869
Less: Notes Receivable from Officers for Restricted Stock...       (159)         (159)
      Restricted Stock......................................     (3,022)       (3,022)
      Treasury Stock, at Cost, 423,620 Shares...............     (5,227)       (5,227)
                                                               --------      --------
          Total Shareholders' Equity........................    163,311       163,311
                                                               --------      --------
          Total Capitalization..............................   $313,311      $367,186
                                                               ========      ========
</TABLE>
 
                                       21
<PAGE>   23
 
                  SELECTED CONSOLIDATED FINANCIAL INFORMATION
            (IN THOUSANDS, EXCEPT RATIOS AND PER SHARE INFORMATION)
 
     The historical financial data presented below for and as of the end of the
five years ended December 31, 1996 are derived from the Company's audited
Consolidated Financial Statements. Such financial statements were audited by
Ernst & Young LLP. The information in this table should be read in conjunction
with the Consolidated Financial Statements of the Company, including the notes
thereto, and Management's Discussion and Analysis of Financial Condition and
Results of Operations, incorporated herein by reference.
 
<TABLE>
<CAPTION>
                                                                                                  SIX MONTHS
                                                                                                     ENDED
                                                       YEAR ENDED DECEMBER 31,                     JUNE 30,
                                           ------------------------------------------------   -------------------
                                            1992      1993      1994      1995       1996       1996       1997
                                           -------   -------   -------   -------   --------   --------   --------
<S>                                        <C>       <C>       <C>       <C>       <C>        <C>        <C>
SUMMARY OF OPERATIONS:
Revenues.................................  $76,838   $65,538   $83,693   $83,289   $133,109   $ 42,856   $121,346
Costs and Expenses:
  Operating Expenses.....................   57,646    35,171    50,907    67,713     91,984     30,073     71,885
  Depreciation, Depletion and
    Amortization.........................   12,883    17,438    14,008     7,271     10,388      3,177      8,359
  Contract Termination Provision.........       --       577     5,193        --         --         --         --
  Write-down in Carrying Value of Oil and
    Gas Properties.......................    1,500        --        --        --         --         --         --
  General and Administrative Expense.....    4,512     4,807     5,114     5,289      6,300      2,814      4,159
                                           -------   -------   -------   -------   --------   --------   --------
Operating Income.........................      297     7,545     8,471     3,016     24,437      6,792     36,943
Other Income (Expense)(1)................    2,721    (3,919)   (2,415)    2,430    (10,015)    (1,107)   (16,357)
                                           -------   -------   -------   -------   --------   --------   --------
Net Income...............................    3,018     3,626     6,056     5,446     14,422      5,685     20,586
Dividends Applicable to Preferred
  Stock(2)...............................   (2,659)   (2,659)   (2,659)   (2,659)       (31)       (31)        --
                                           -------   -------   -------   -------   --------   --------   --------
Net Income Applicable to Common and
  Common Equivalent Shares...............  $   359   $   967   $ 3,397   $ 2,787   $ 14,391   $  5,654   $ 20,586
                                           =======   =======   =======   =======   ========   ========   ========
Net Income per Share(3)..................  $  0.06   $  0.11   $  0.40   $  0.34   $   1.04   $   0.44   $   1.34
                                           =======   =======   =======   =======   ========   ========   ========
Weighted Average Number of Common and
  Common Equivalent Shares
  Outstanding(2)(3)......................    6,514     9,028     8,446     8,216     13,852     12,726     15,365
</TABLE>
 
<TABLE>
<CAPTION>
                                                              AT DECEMBER 31,
                                            ----------------------------------------------------       AT JUNE 30,
                                              1992       1993       1994       1995       1996            1997
                                            --------   --------   --------   --------   --------       -----------
<S>                                         <C>        <C>        <C>        <C>        <C>             <C>   
SUMMARY BALANCE SHEET DATA:
Working Capital...........................  $ 24,830   $ 20,402   $ 19,331   $ 33,859   $ 68,221        $ 36,016
Property and Equipment, Net...............   101,178     86,506     71,248     65,950    216,474         282,456
Total Assets..............................   150,203    133,523    120,167    128,962    339,546         372,627
10.25% Senior Notes.......................        --         --         --         --    150,000         150,000
Notes Payable, Long-Term..................    28,348     13,108         --         --         --           --
Total Shareholders' Equity(2)(4)..........  $ 71,446   $ 72,494   $ 70,881   $ 74,015   $142,168        $163,311
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                                  SIX MONTHS
                                                                                                     ENDED
                                                       YEAR ENDED DECEMBER 31,                     JUNE 30,
                                           ------------------------------------------------   -------------------
                                            1992      1993      1994      1995       1996       1996       1997
                                           -------   -------   -------   -------   --------   --------   --------
<S>                                        <C>       <C>       <C>       <C>       <C>        <C>        <C>
OTHER NON-GAAP FINANCIAL DATA:
EBITDA(5)................................  $18,766   $23,682   $26,873   $15,322   $ 41,071   $ 13,509   $ 47,816
Capital Expenditures.....................  $21,878   $12,668   $ 9,100   $13,437   $144,504   $118,621   $ 76,341
Ratio of EBITDA to Total Interest(6).....     7.1x     17.5x     32.5x     77.0x       4.1x       7.5x       5.8x
Ratio of Earnings to Fixed Charges(6)....     1.6x      4.0x      8.7x     31.8x       3.0x       5.6x       4.7x
</TABLE>
 
- ---------------
 
(1) Includes items of other income and expense, interest expense and income
    taxes. Includes net gains on disposition of assets of $5.0 million in 1992,
    litigation settlement and expenses of $3.7 million in 1993, net exchange
    rate losses of $1.2 million in 1994, net gains on disposition of assets of
    $2.7 million and net exchange rate gains of $2.6 million in 1995, net gains
    on disposition of assets of $3.7 million in 1996, and net gains on
    disposition of assets of $2.6 million and $2.5 million in the first six
    months of 1996 and 1997, respectively.
 
                                       22
<PAGE>   24
 
(2) On January 17, 1996, the Company issued 2,113,557 shares of Common Stock,
    before effects of the Stock Split, upon conversion of 1,115,988 shares of
    its 1,150,000 outstanding shares of Preferred Stock. The remaining 34,012
    shares were redeemed for cash in the amount of $25.69 per share plus $0.22
    per share in accrued dividends thereon at a cost to the Company of
    approximately $.9 million.
 
(3) On June 9, 1997, the Company effected a two-for-one Stock Split. All
    references to the weighted average number of common and common equivalent
    shares outstanding and per share amounts have been restated to reflect the
    Stock Split, unless otherwise indicated.
 
(4) The Company has not paid any cash dividends on its Common Stock.
 
(5) EBITDA represents net income before depreciation, depletion, amortization,
    contract termination provision, write-down in carrying value of oil and gas
    properties, interest expense and income taxes. Although EBITDA is not a
    measurement presented in accordance with GAAP, EBITDA is frequently used by
    securities analysts and is presented here to provide additional information
    about the Company's operations. The Company believes that EBITDA may provide
    additional information about the Company's ability to meet future
    requirements for debt service, capital expenditures and working capital,
    although such future cash outlays are not included in the determination of
    EBITDA. The amount of and trends in EBITDA should not be considered as an
    alternative to net income as a measure of operating results or as an
    alternative to operating cash flows as a better measure of liquidity.
    Because EBITDA includes some, but not all, items that affect net income, and
    its computation may vary among companies, the EBITDA calculation presented
    above may not be comparable to similarly titled measures of other companies.
 
(6) For purposes of these calculations, earnings consist of income before income
    taxes plus fixed charges, excluding capitalized interest. Total interest
    consists of interest expense plus capitalized interest. Fixed charges
    consist of interest expense, including capitalized interest, and a portion
    of rent considered to represent interest cost.
 
            SELECTED FINANCIAL INFORMATION OF SUBSIDIARY GUARANTORS
 
     Separate financial statements and other disclosures concerning the
Subsidiary Guarantors are not presented because management has determined that
such financial statements and other disclosures are not material to investors.
The combined condensed financial information of the Company's Subsidiary
Guarantors is as follows:
 
<TABLE>
<CAPTION>
                                                                   AT JUNE 30,
                                                              ---------------------
                                                                1997         1996
                                                              --------     --------
                                                                 (IN THOUSANDS)
<S>                                                           <C>          <C>
Current Assets..............................................  $ 23,854     $  7,886
Non-Current Assets..........................................   125,994      148,042
                                                              --------     --------
          Total Assets......................................  $149,848     $155,928
                                                              ========     ========
Current Liabilities.........................................  $ 11,196     $  6,445
Non-Current Liabilities.....................................   111,293      132,091
Equity......................................................    27,359       17,392
                                                              --------     --------
          Total Liabilities and Equity......................  $149,848     $155,928
                                                              ========     ========
</TABLE>
 
<TABLE>
<CAPTION>
                                                              SIX MONTHS ENDED JUNE 30,
                                                              -------------------------
                                                                 1997           1996
                                                              ----------      ---------
                                                                   (IN THOUSANDS)
<S>                                                           <C>             <C>
Revenues....................................................    $ 41,088        $ 6,803
Operating Income............................................    $ 17,826        $ 1,912
Net Income..................................................    $  7,544        $   599
</TABLE>
 
                                       23
<PAGE>   25
 
                               THE EXCHANGE OFFER
 
GENERAL
 
     In connection with the sale of the Old Notes, the purchasers thereof became
entitled to the benefits of certain registration rights under the Registration
Rights Agreement. The Exchange Notes are being offered hereunder in order to
satisfy the obligations of the Company under the Registration Rights Agreement.
See "Registration Rights Agreement."
 
     For each $1,000 principal amount of Old Notes surrendered to the Company
pursuant to the Exchange Offer, the holder of such Old Notes will receive $1,000
principal amount of Exchange Notes. Upon the terms and subject to the conditions
set forth in this Prospectus and in the accompanying Letter of Transmittal, the
Company will accept all Old Notes properly tendered prior to 5:00 p.m., New York
City time, on the Expiration Date. Holders may tender some or all of their Old
Notes pursuant to the Exchange Offer in integral multiples of $1,000 principal
amount.
 
     Under existing interpretations of the staff of the SEC, including Exxon
Capital Holdings Corporation, SEC No-Action Letter (available April 13, 1989),
the Morgan Stanley Letter and Mary Kay Cosmetics, Inc., SEC No-Action Letter
(available June 5, 1991), the Company believes that the Exchange Notes would in
general be freely transferable after the Exchange Offer without further
registration under the Securities Act by the respective holders thereof (other
than a Restricted Holder), without compliance with the registration and
prospectus delivery provisions of the Securities Act, provided that such
Exchange Notes are acquired in the ordinary course of such holder's business and
such holder is not participating in, and has no arrangement with any person to
participate in, the distribution (within the meaning of the Securities Act) of
such Exchange Notes. Eligible holders wishing to accept the Exchange Offer must
represent to the Company that such conditions have been met. Any holder of Old
Notes who tenders in the Exchange Offer for the purpose of participating in a
distribution of the Exchange Notes could not rely on the interpretation by the
staff of the SEC enunciated in the Morgan Stanley Letter and similar no-action
letters, and must comply with the registration and prospectus delivery
requirements of the Securities Act in connection with any resale transaction.
 
     Each holder of Old Notes who wishes to exchange Old Notes for Exchange
Notes in the Exchange Offer will be required to make certain representations,
including that (i) it is neither an affiliate of the Company nor a broker-dealer
tendering Old Notes acquired directly from the Company for its own account, (ii)
any Exchange Notes to be received by it are being acquired in the ordinary
course of its business and (iii) it is not participating in, and it has no
arrangement with any person to participate in, the distribution (within the
meaning of the Securities Act) of the Exchange Notes. In addition, in connection
with any resales of Exchange Notes, any broker-dealer (a "Participating
Broker-Dealer") who acquired Old Notes for its own account as a result of
market-making activities or other trading activities must acknowledge that it
will deliver a prospectus meeting the requirements of the Securities Act in
connection with any resale of such Exchange Notes. The staff of the SEC has
taken the position in no-action letters issued to third parties including
Shearman & Sterling, SEC No-Action Letter (available July 2, 1993), that
Participating Broker-Dealers may fulfill their prospectus delivery requirements
with respect to the Exchange Notes (other than a resale of an unsold allotment
from the original sale of Old Notes) with this Prospectus, as it may be amended
or supplemented from time to time. Under the Registration Rights Agreement, the
Company is required to allow Participating Broker-Dealers to use this
Prospectus, as it may be amended or supplemented from time to time, in
connection with the resale of such Exchange Notes. See "Plan of Distribution."
 
     The Exchange Offer shall be deemed to have been consummated upon the
earlier to occur of (i) the Company having exchanged Exchange Notes for all
outstanding Old Notes (other than Old Notes held by a Restricted Holder)
pursuant to the Exchange Offer and (ii) the Company having exchanged, pursuant
to the Exchange Offer, Exchange Notes for all Old Notes that have been tendered
and not withdrawn on the date that is 30 days following the commencement of the
Exchange Offer. In such event, holders of Old Notes seeking liquidity in their
investment would have to rely on exemptions to registration requirements under
the securities laws, including the Securities Act.
 
                                       24
<PAGE>   26
 
     As of the date of this Prospectus, $50,000,000 principal amount of Old
Notes are issued and outstanding. In connection with the issuance of the Old
Notes, the Company arranged for the Old Notes to be eligible for trading in the
Private Offering, Resale and Trading through Automated Linkages (PORTAL) Market,
the National Association of Securities Dealers' screen based, automated market
trading of securities eligible for resale under Rule 144A.
 
     The Company shall be deemed to have accepted for exchange validly tendered
Old Notes when, as and if the Company has given oral or written notice thereof
to the Exchange Agent. See "-- Exchange Agent." The Exchange Agent will act as
agent for the tendering holders of Old Notes for the purpose of receiving
Exchange Notes from the Company and delivering Exchange Notes to such holders.
If any tendered Old Notes are not accepted for exchange because of an invalid
tender or the occurrence of certain other events set forth herein, certificates
for any such unaccepted Old Notes will be returned, without expense, to the
tendering holder thereof as promptly as practicable after the Expiration Date.
Holders of Old Notes who tender in the Exchange Offer will not be required to
pay brokerage commissions or fees or, subject to the instructions in the Letter
of Transmittal, transfer taxes with respect to the exchange of Old Notes
pursuant to the Exchange Offer. The Company will pay all charges and expenses,
other than certain applicable taxes, in connection with the Exchange Offer. See
"-- Fees and Expenses."
 
     This Prospectus, together with the accompanying Letter of Transmittal, is
being sent to all registered holders as of the date of this Prospectus.
 
EXPIRATION DATE; EXTENSIONS; AMENDMENTS
 
   
     The term "Expiration Date" shall mean December 16, 1997 unless the Company,
in its sole discretion, extends the Exchange Offer, in which case the term
"Expiration Date" shall mean the latest date to which the Exchange Offer is
extended. In order to extend the Expiration Date, the Company will notify the
Exchange Agent of any extension by oral or written notice and will mail to the
record holders of Old Notes an announcement thereof, each prior to 9:00 a.m.,
New York City time, on the next business day after the previously scheduled
Expiration Date. Such announcement may state that the Company is extending the
Exchange Offer for a specified period of time. The Company reserves the right
(i) to delay acceptance of any Old Notes, to extend the Exchange Offer or to
terminate the Exchange Offer and to refuse to accept Old Notes not previously
accepted, if any of the conditions set forth herein under "-- Termination" shall
have occurred and shall not have been waived by the Company (if permitted to be
waived by the Company), by giving oral or written notice of such delay,
extension or termination to the Exchange Agent, and (ii) to amend the terms of
the Exchange Offer in any manner deemed by it to be advantageous to the holders
of the Old Notes. Any such delay in acceptance, extension, termination or
amendment will be followed as promptly as practicable by oral or written notice
thereof. If the Exchange Offer is amended in a manner determined by the Company
to constitute a material change, the Company will promptly disclose such
amendment in a manner reasonably calculated to inform the holders of the Old
Notes of such amendment. Without limiting the manner in which the Company may
choose to make public announcements of any delay in acceptance, extension,
termination or amendment of the Exchange Offer, the Company shall have no
obligation to publish, advertise, or otherwise communicate any such public
announcement, other than by making a timely release to the Dow Jones News
Service.
    
 
INTEREST ON THE EXCHANGE NOTES
 
     The Notes bear interest payable semi-annually on May 15 and November 15 of
each year, commencing November 15, 1997. Holders of Old Notes of record on
November 1, 1997 will receive interest on November 15, 1997 from the date of
issuance of the Old Notes, August 7, 1997. Holders of Exchange Notes of record
on May 1, 1998 will receive interest on May 15, 1998 from the date of issuance
of the Exchange Notes, plus an amount equal to the accrued interest on the Old
Notes from the date of the last interest payment, November 15, 1997, to the date
of exchange thereof. Consequently, holders who exchange their Old Notes for
Exchange Notes will receive the same interest payment on May 15, 1998 that they
would have received had they not accepted the Exchange Offer. Interest on the
Old Notes accepted for exchange will cease to accrue upon issuance of the
Exchange Notes.
 
                                       25
<PAGE>   27
 
PROCEDURES FOR TENDERING
 
     To tender in the Exchange Offer, a holder must complete, sign and date the
Letter of Transmittal, or a facsimile thereof, have the signatures thereon
guaranteed if required by the Letter of Transmittal, and mail or otherwise
deliver such Letter of Transmittal or such facsimile, together with the Old
Notes and any other required documents, to the Exchange Agent prior to 5:00
p.m., New York City time, on the Expiration Date. The tender by a holder of Old
Notes will constitute an agreement between such holder and the Company in
accordance with the terms and subject to the conditions set forth herein and in
the Letter of Transmittal. Delivery of all documents must be made to the
Exchange Agent at its address set forth herein. Holders may also request that
their respective brokers, dealers, commercial banks, trust companies or nominees
effect such tender for such holders. The method of delivery of Old Notes and the
Letter of Transmittal and all other required documents to the Exchange Agent is
at the election and risk of the holders. Instead of delivery by mail, it is
recommended that holders use an overnight or hand delivery service. In all
cases, sufficient time should be allowed to assure timely delivery. No Letter of
Transmittal or Old Notes should be sent to the Company. Only a holder of Old
Notes may tender such Old Notes in the Exchange Offer. The term "holder" with
respect to the Exchange Offer means any person in whose name Old Notes are
registered on the books of the Company or any other person who has obtained a
properly completed stock power from the registered holder.
 
     Any beneficial holder whose Old Notes are registered in the name of such
holder's broker, dealer, commercial bank, trust company or other nominee and who
wishes to tender should contact such registered holder promptly and instruct
such registered holder to tender on behalf of the registered holder. If such
beneficial holder wishes to tender directly, such beneficial holder must, prior
to completing and executing the Letter of Transmittal and delivering his Old
Notes, either make appropriate arrangements to register ownership of the Old
Notes in such holder's name or obtain a properly completed bond power from the
registered holder. The transfer of record ownership may take considerable time.
If the Letter of Transmittal is signed by the record holder(s) of the Old Notes
tendered thereby, the signature must correspond with the name(s) written on the
face of the Old Notes without alteration, enlargement or any change whatsoever.
If the Letter of Transmittal is signed by a participant in DTC, the signature
must correspond with the name as it appears on the security position listing as
the holder of the Old Notes. Signatures on a Letter of Transmittal or a notice
of withdrawal, as the case may be, must be guaranteed by a member firm of a
registered national securities exchange or of the National Association of
Securities Dealers, Inc., a commercial bank or trust company having an office or
correspondent in the United States or an "eligible guarantor institution" within
the meaning of Rule 17Ad-15 under the Exchange Act (an "Eligible Institution")
unless the Old Notes tendered pursuant thereto are tendered (i) by a registered
holder (or by a participant in DTC whose name appears on a security position
listing as the owner) who has not completed the box entitled "Special Issuance
Instructions" or "Special Delivery Instructions" on the Letter of Transmittal
and the Exchange Notes are being issued directly to such registered holder (or
deposited into the participant's account at DTC) or (ii) for the account of an
Eligible Institution. If the Letter of Transmittal is signed by a person other
than the registered holder of any Old Notes listed therein, such Old Notes must
be endorsed or accompanied by appropriate bond powers which authorize such
person to tender the Old Notes on behalf of the registered holder, in either
case signed as the name of the registered holder or holders appears on the Old
Notes. If the Letter of Transmittal or any Old Notes or bond powers are signed
by trustees, executors, administrators, guardians, attorneys-in-fact, officers
of corporations or others acting in a fiduciary or representative capacity, such
persons should so indicate when signing, and unless waived by the Company,
evidence satisfactory to the Company of their authority to so act must be
submitted with the Letter of Transmittal.
 
     A tender will be deemed to have been received as of the date when the
tendering holder's duly signed Letter of Transmittal accompanied by Old Notes
(or a timely confirmation received of a book-entry transfer of Old Notes into
the Exchange Agent's account at DTC) or a Notice of Guaranteed Delivery from an
Eligible Institution is received by the Exchange Agent. Issuances of Exchange
Notes in exchange for Old Notes tendered pursuant to a Notice of Guaranteed
Delivery by an Eligible Institution will be made only against delivery of the
Letter of Transmittal (and any other required documents) and the tendered Old
Notes
 
                                       26
<PAGE>   28
 
(or a timely confirmation received of a book-entry transfer of Old Notes into
the Exchange Agent's account at DTC) with the Exchange Agent.
 
     All questions as to the validity, form, eligibility (including time of
receipt), acceptance and withdrawal of the tendered Old Notes will be determined
by the Company in its sole discretion, which determination will be final and
binding. The Company reserves the absolute right to reject any and all Old Notes
not properly tendered or any Old Notes the Company's acceptance of which would,
in the opinion of the Company or its counsel, be unlawful. The Company also
reserves the absolute right to waive any conditions of the Exchange Offer or
defects or irregularities in tender as to particular Old Notes. The Company's
interpretation of the terms and conditions of the Exchange Offer (including the
instructions in the Letter of Transmittal) shall be final and binding on all
parties. Unless waived, any defects or irregularities in connection with tenders
of Old Notes must be cured within such time as the Company shall determine.
Neither the Company, the Exchange Agent nor any other person shall be under any
duty to give notification of defects or irregularities with respect to tenders
of Old Notes nor shall any of them incur any liability for failure to give such
notification. Tenders of Old Notes will not be deemed to have been made until
such irregularities have been cured or waived. Any Old Notes received by the
Exchange Agent that are not properly tendered and as to which the defects or
irregularities have not been cured or waived will be returned without cost by
the Exchange Agent to the tendering holder of such Old Notes unless otherwise
provided in the Letter of Transmittal, as soon as practicable following the
Expiration Date. In addition, the Company reserves the right in its sole
discretion to (i) purchase or make offers for any Old Notes that remain
outstanding subsequent to the Expiration Date, or, as set forth under
"-- Termination," to terminate the Exchange Offer and (ii) to the extent
permitted by applicable law, purchase Old Notes in the open market, in privately
negotiated transactions or otherwise. The terms of any such purchases or offers
may differ from the terms of the Exchange Offer.
 
BOOK-ENTRY TRANSFER
 
     The Exchange Agent will establish an account with respect to the Old Notes
at DTC within two business days after the date of this Prospectus, and any
financial institution which is a participant in DTC may make book-entry delivery
of the Old Notes by causing DTC to transfer such Old Notes into the Exchange
Agent's account in accordance with DTC's procedure for such transfer. Although
delivery of Old Notes may be effected through book-entry transfer into the
Exchange Agent's account at DTC, the Letter of Transmittal, with any required
signature guarantees and any other required documents, must in any case be
transmitted to and received by the Exchange Agent on or prior to the Expiration
Date at one of its addresses set forth below under "-- Exchange Agent", or the
guaranteed delivery procedure described below must be complied with. DELIVERY OF
DOCUMENTS TO DTC DOES NOT CONSTITUTE DELIVERY TO THE EXCHANGE AGENT. All
references in this Prospectus to deposit or delivery of Old Notes shall be
deemed to include DTC's book-entry delivery method.
 
GUARANTEED DELIVERY PROCEDURES
 
     Holders who wish to tender their Old Notes and whose Old Notes are not
immediately available or who cannot deliver their Old Notes, the Letter of
Transmittal or any other required documents to the Exchange Agent prior to the
Expiration Date, or who cannot complete the procedure for book-entry transfer on
a timely basis, may effect a tender if: (i) the tender is made by or through an
Eligible Institution; (ii) prior to the Expiration Date, the Exchange Agent
receives from such Eligible Institution a properly completed and duly executed
Notice of Guaranteed Delivery (by facsimile transmission, mail or hand delivery)
setting forth the name and address of the holder of the Old Notes, the
registration number or numbers of such Old Notes (if applicable), and the total
principal amount of Old Notes tendered, stating that the tender is being made
thereby and guaranteeing that, within five business days after the Expiration
Date, the Letter of Transmittal, together with the Old Notes in proper form for
transfer (or a confirmation of a book-entry transfer into the Exchange Agent's
account at DTC) and any other documents required by the Letter of Transmittal,
will be deposited by the Eligible Institution with the Exchange Agent; and (iii)
such properly completed and executed Letter of Transmittal, together with the
certificate(s) representing all tendered Old Notes in proper
 
                                       27
<PAGE>   29
 
form for transfer (or a confirmation of such a book-entry transfer) and all
other documents required by the Letter of Transmittal are received by the
Exchange Agent within five business days after the Expiration Date.
 
TERMS AND CONDITIONS OF THE LETTER OF TRANSMITTAL
 
     The Letter of Transmittal contains, among other things, certain terms and
conditions which are summarized below and are part of the Exchange Offer.
 
     Each holder who participates in the Exchange Offer will be required to
represent that any Exchange Notes received by it will be acquired in the
ordinary course of its business, that such holder is not participating in, and
has no arrangement with any person to participate in, the distribution (within
the meaning of the Securities Act) of the Exchange Notes, and that such holder
is not a Restricted Holder.
 
     Old Notes tendered in exchange for Exchange Notes (or a timely confirmation
of a book-entry transfer of such Old Notes into the Exchange Agent's account at
DTC) must be received by the Exchange Agent, with the Letter of Transmittal and
any other required documents, by the Expiration Date or within the time periods
set forth above pursuant to a Notice of Guaranteed Delivery from an Eligible
Institution. Each holder tendering the Old Notes for exchange sells, assigns and
transfers the Old Notes to the Exchange Agent, as agent of the Company, and
irrevocably constitutes and appoints the Exchange Agent as the holder's agent
and attorney-in-fact to cause the Old Notes to be transferred and exchanged. The
holder warrants that it has full power and authority to tender, exchange, sell,
assign and transfer the Old Notes and to acquire the Exchange Notes issuable
upon the exchange of such tendered Old Notes, that the Exchange Agent, as agent
of the Company, will acquire good and unencumbered title to the tendered Old
Notes, free and clear of all liens, restrictions, charges and encumbrances, and
that the Old Notes tendered for exchange are not subject to any adverse claims
when accepted by the Exchange Agent, as agent of the Company. The holder also
warrants and agrees that it will, upon request, execute and deliver any
additional documents deemed by the Company or the Exchange Agent to be necessary
or desirable to complete the exchange, sale, assignment and transfer of the Old
Notes. All authority conferred or agreed to be conferred in the Letter of
Transmittal by the holder will survive the death, incapacity or dissolution of
the holder, and any obligation of the holder shall be binding upon the heirs,
personal representatives, successors and assigns of such holder.
 
WITHDRAWAL OF TENDERS
 
     Except as otherwise provided herein, tenders of Old Notes may be withdrawn
at any time prior to 5:00 p.m., New York City time, on the business day prior to
the Expiration Date, unless previously accepted for exchange. To withdraw a
tender of Old Notes in the Exchange Offer, a written or facsimile transmission
notice of withdrawal must be received by the Exchange Agent at its address set
forth herein prior to 5:00 p.m., New York City time, on the business day prior
to the Expiration Date and prior to acceptance for exchange thereof by the
Company. Any such notice of withdrawal must (i) specify the name of the person
having deposited the Old Notes to be withdrawn (the "Depositor"), (ii) identify
the Old Notes to be withdrawn (including, if applicable, the registration number
or numbers and total principal amount of such Old Notes), (iii) be signed by the
Depositor in the same manner as the original signature on the Letter of
Transmittal by which such Old Notes were tendered (including any required
signature guarantees) or be accompanied by documents of transfer sufficient to
permit the Trustee with respect to the Old Notes to register the transfer of
such Old Notes into the name of the Depositor withdrawing the tender, (iv)
specify the name in which any such Old Notes are to be registered, if different
from that of the Depositor and (v) if applicable because the Old Notes have been
tendered pursuant to the book-entry procedures, specify the name and number of
the participant's account at DTC to be credited, if different than that of the
Depositor. All questions as to the validity, form and eligibility (including
time of receipt) of such withdrawal notices will be determined by the Company,
whose determination shall be final and binding on all parties. Any Old Notes so
withdrawn will be deemed not to have been validly tendered for purposes of the
Exchange Offer and no Exchange Notes will be issued with respect thereto unless
the Old Notes so withdrawn are validly retendered. Any Old Notes which have been
tendered but which are not accepted for exchange will be returned to the holder
thereof without cost to such holder as soon as practicable after withdrawal,
rejection of tender or termination of the Exchange
 
                                       28
<PAGE>   30
 
Offer. Properly withdrawn Old Notes may be retendered by following one of the
procedures described above under "-- Procedures for Tendering" at any time prior
to the Expiration Date.
 
TERMINATION
 
     Notwithstanding any other term of the Exchange Offer, the Company will not
be required to accept for exchange any Old Notes not theretofore accepted for
exchange, and may terminate the Exchange Offer if it determines that the
Exchange Offer violates any applicable law or interpretation of the staff of the
SEC.
 
     If the Company determines that it may terminate the Exchange Offer, as set
forth above, the Company may (i) refuse to accept any Old Notes and return to
the holders thereof any Old Notes that have been tendered, (ii) extend the
Exchange Offer and retain all Old Notes tendered prior to the Expiration of the
Exchange Offer, subject to the rights of such holders of tendered Old Notes to
withdraw their tendered Old Notes, or (iii) waive such termination event with
respect to the Exchange Offer and accept all properly tendered Old Notes that
have not been withdrawn. If such waiver constitutes a material change in the
Exchange Offer, the Company will disclose such change by means of a supplement
to this Prospectus that will be distributed to each registered holder of Old
Notes, and the Company will extend the Exchange Offer for a period of five to
ten business days, depending upon the significance of the waiver and the manner
of disclosure to the registered holders of the Old Notes, if the Exchange Offer
would otherwise expire during such period. Holders of Old Notes will have
certain rights against the Company under the Registration Rights Agreement
should the Company fail to consummate the Exchange Offer. See "Registration
Rights Agreement."
 
EXCHANGE AGENT
 
     State Street Bank and Trust Company has been appointed as Exchange Agent
for the Exchange Offer. Questions and requests for assistance and requests for
additional copies of this Prospectus or of the Letter of Transmittal should be
directed to the Exchange Agent addressed as follows:
 
<TABLE>
<S>                                               <C>
By Mail:                                          By Hand or Overnight Courier:
State Street Bank and Trust Company               State Street Bank and Trust Company
Corporate Trust Department                        Corporate Trust Department
P.O. Box 778                                      Fourth Floor
Boston, Massachusetts 02102-0078                  Two International Place
                                                  Boston, Massachusetts 02110
Facsimile Transmission: (617) 664-5232
Confirm by Telephone: (617) 664-5314
</TABLE>
 
FEES AND EXPENSES
 
     The expenses of soliciting tenders pursuant to the Exchange Offer will be
borne by the Company. The principal solicitation for tenders pursuant to the
Exchange Offer is being made by mail. Additional solicitations may be made by
officers and regular employees of the Company and its affiliates in person, by
telegraph or telephone. The Company will not make any payments to brokers,
dealers or other persons soliciting acceptances of the Exchange Offer. The
Company, however, will pay the Exchange Agent reasonable and customary fees for
its services and will reimburse the Exchange Agent for its reasonable out-
of-pocket expenses in connection therewith. The Company may also pay brokerage
houses and other custodians, nominees and fiduciaries the reasonable
out-of-pocket expenses incurred by them in forwarding copies of this Prospectus,
Letters of Transmittal and related documents to the beneficial owners of the Old
Notes and in handling or forwarding tenders for exchange.
 
     The other expenses incurred in connection with the Exchange Offer,
including fees and expenses of the Exchange Agent and Trustee and accounting and
legal fees, will be paid by the Company. The Company will pay all transfer
taxes, if any, applicable to the exchange of Old Notes pursuant to the Exchange
Offer. If, however, Exchange Notes or Old Notes not tendered or accepted for
exchange are to be delivered to, or are to be registered or issued in the name
of, any person other than the registered holder of the Old Notes tendered,
 
                                       29
<PAGE>   31
 
or if tendered Old Notes are registered in the name of any person other than the
person signing the Letter of Transmittal, or if a transfer tax is imposed for
any reason other than the exchange of Old Notes pursuant to the Exchange Offer,
then the amount of any such transfer taxes (whether imposed on the registered
holder or any other persons) will be payable by the tendering holder. If
satisfactory evidence of payment of such taxes or exemption therefrom is not
submitted with the Letter of Transmittal, the amount of such transfer taxes will
be billed directly to such tendering holder.
 
ACCOUNTING TREATMENT
 
     No gain or loss for accounting purposes will be recognized by the Company
upon the consummation of the Exchange Offer. The expenses of the Exchange Offer
will be amortized by the Company over the term of the Exchange Notes under
generally accepted accounting principles.
 
                      DESCRIPTION OF EXISTING INDEBTEDNESS
 
REVOLVING CREDIT FACILITY
 
     The Company has established a credit facility (the "Revolving Credit
Facility") with ING (U.S.) Capital Corporation ("ING") to fund its working
capital requirements and other obligations and to support the issuance of
letters of credit. The Company may borrow from time to time up to $35 million
under the Revolving Credit Facility, subject to certain borrowing base
limitations. All advances to the Company under the Revolving Credit Facility
bear interest at  1/4% per annum plus the greater of the prevailing Federal
Funds Rate plus  1/2% or a referenced average prime rate; or at the adjusted
LIBOR rate plus 2% per annum. The foregoing rates are subject to an increase of
 1/2% in the event certain financial criteria are not met. The Company is also
obligated to pay ING (i) a commitment fee equal to  1/2% per annum on the
average daily unadvanced portion of the commitments and (ii) a letter of credit
fee of 2% per annum on the average daily undrawn and unexpired amount of each
letter of credit during the period that sum remains outstanding. The Revolving
Credit Facility expires on May 31, 1998.
 
     The Revolving Credit Facility is secured by accounts receivable, rig
inventory, equipment, certain oil and gas properties and the stock of certain
subsidiaries of the Company, including, but not limited to, certain of the
Subsidiary Guarantors. The Revolving Credit Facility requires the Company to
comply with various covenants including, but not limited to, the maintenance of
various financial ratios, and restricts the Company from declaring, making or
paying any dividends on its Common Stock.
 
     At August 31, 1997, the Company had no outstanding borrowings under the
Revolving Credit Facility.
 
SERIES B NOTES
 
     In May, 1996, the Company issued $150 million in principal amount of Series
A Notes (as defined), which were exchanged for Series B Notes, all of which is
outstanding as of August 31, 1997. The terms of the Notes are substantially
identical to the terms of the Series B Notes, except that the Company is
required to make a Net Proceeds Offer (as defined) to the holders of the Notes
only if Excess Proceeds (as defined) from an Asset Sale (as defined) remain
after making a Series B Net Proceeds Offer (as defined). See "Description of the
Notes -- Certain Covenants -- Limitation on Asset Sales."
 
                            DESCRIPTION OF THE NOTES
 
     The Exchange Notes will be issued, and the Old Notes were issued, under an
indenture entered into among the Company, as issuer, Southwestern Offshore
Corporation (formerly known as Cliffs Drilling Asset Acquisition Company),
Cliffs Drilling Merger Company, Cliffs Drilling International, Inc., Cliffs Oil
and Gas Company and DRL, Inc., as Subsidiary Guarantors, and State Street Bank
and Trust Company, as trustee (the "Trustee") dated as of August 7, 1997, as
amended and supplemented by First Supplemental Indenture dated as of August 29,
1997 (such indenture, as so amended and supplemented, the "Indenture"), which
added Cliffs Drilling Trinidad Limited and West Indies Drilling Joint Venture as
Subsidiary Guarantors. Old
 
                                       30
<PAGE>   32
 
Notes were issued under the Indenture on August 7, 1997 in an aggregate
principal amount of $50,000,000. References to the Notes include the Old Notes
and the Exchange Notes unless the context otherwise requires. Upon the
effectiveness of the Exchange Offer Registration Statement, the Indenture will
be subject to and governed by the Trust Indenture Act of 1939, as amended (the
"Trust Indenture Act"). The following summary of certain provisions of the
Indenture and of the Registration Rights Agreement does not purport to be
complete and is subject to, and is qualified in its entirety by reference to,
all of the provisions of the Indenture, including the definitions of certain
terms contained therein and those terms that are made a part of the Indenture by
reference to the Trust Indenture Act and of the Registration Rights Agreement,
respectively. Copies of the Indenture and the Registration Rights Agreement are
available from the Company upon request. Capitalized terms not otherwise defined
below or elsewhere in this Prospectus have the meanings given to them in the
Indenture. The definitions of certain capitalized terms used in the following
summary are set forth below under "-- Certain Definitions."
 
GENERAL
 
     The Notes will be senior unsecured obligations of the Company limited to
$50 million aggregate principal amount. The Notes will be issued only in
registered form, without coupons, in denominations of $1,000 and integral
multiples thereof. Principal of, premium, if any, and interest on the Notes will
be payable, and the Notes will be transferable, at the office or agency of the
Company in the City of New York maintained for such purposes, which initially
will be the corporate trust office or agency of the Trustee maintained at State
Street Bank and Trust Company N.A., 61 Broadway, Concourse Level, New York, New
York 10006. In addition, in the event the Notes do not remain in book-entry
form, interest may be paid, at the option of the Company, by check mailed to the
registered holders of the Notes at their respective addresses as shown on the
Note Register, subject to the right of any holder of Notes in the principal
amount of $500,000 or more to request payment by wire transfer. No service
charge will be made for any transfer, exchange or redemption of the Notes, but
the Company or the Trustee may require payment of a sum sufficient to cover any
tax or other governmental charge that may be payable in connection therewith.
 
     The obligations of the Company under the Notes will be guaranteed on a
senior unsecured basis by the Subsidiary Guarantors, and the obligations of the
Subsidiary Guarantors under the notes will rank on a parity with the obligations
of the Subsidiary Guarantors under the Company's outstanding Series B Notes. See
"-- Subsidiary Guarantees of Notes."
 
     Any Notes that remain outstanding after the completion of the Exchange
Offer, together with the Exchange Notes issued in connection with the Exchange
Offer, will be treated as a single class of securities under the Indenture.
 
MATURITY, INTEREST AND PRINCIPAL PAYMENTS
 
     The Notes will mature on May 15, 2003. Interest on the Notes will accrue
from August 7, 1997 at the rate of 10.25% per annum and will be payable
semiannually in cash in arrears on May 15 and November 15 of each year,
commencing November 15, 1997, to the Persons in whose name the Notes are
registered in the Note Register at the close of business on the May 1 or
November 1 next preceding such interest payment date. Holders of Old Notes of
record on November 1, 1997 will receive interest on November 15, 1997 from the
date of issuance of the Old Notes, August 7, 1997. Holders of Exchange Notes of
record on May 1, 1998 will receive interest on May 15, 1998 from the date of
issuance of the Exchange Notes, plus an amount equal to the accrued interest on
the Old Notes from the date of the last interest payment, November 15, 1997, to
the date of exchange thereof. The interest rate on the Notes is subject to
increase if the Company fails to satisfy certain provisions of the Registration
Rights Agreement. See "-- Exchange Offer; Registration Rights Agreement."
Interest will be computed on the basis of a 360-day year comprised of twelve
30-day months.
 
REDEMPTION
 
     Optional Redemption.  The Notes will be redeemable at the option of the
Company, in whole or in part, at any time on or after May 15, 2000, upon not
less than 30 or more than 60 days' notice, at the redemption
 
                                       31
<PAGE>   33
 
prices (expressed as percentages of principal amount) set forth below, plus
accrued and unpaid interest, if any, to the date of redemption (subject to the
right of Holders of record on the relevant record date to receive interest due
on an interest payment date that is on or prior to the date of redemption), if
redeemed during the 12-month period beginning on May 15 of the years indicated
below:
 
<TABLE>
<CAPTION>
                                                              REDEMPTION
                            YEAR                                PRICE
                            ----                              ----------
<S>                                                           <C>
2000........................................................    105.00%
2001........................................................    102.50%
2002 and thereafter.........................................    100.00%
</TABLE>
 
     In the event that less than all of the Notes are to be redeemed, the
particular Notes (or any portion thereof that is an integral multiple of $1,000)
to be redeemed shall be selected not less than 30 or more than 60 days prior to
the date of redemption by the Trustee, from the outstanding Notes not previously
called for redemption, pro rata, by lot or by any other method the Trustee shall
deem fair and appropriate.
 
     Notwithstanding the foregoing, at any time on or prior to May 15, 1999, up
to $12.5 million in aggregate principal amount of Notes will be redeemable, at
the option of the Company, upon not less than 30 or more than 60 days' notice,
from the Net Cash Proceeds of a Public Equity Offering, at a redemption price
equal to 110% of the principal amount thereof, together with accrued and unpaid
interest to the date of redemption, provided that at least $37.5 million in
aggregate principal amount of Notes remains outstanding immediately after such
redemption and that such redemption occurs within 60 days following the closing
of such Public Equity Offering.
 
     Offers to Purchase.  As described below, (a) upon the occurrence of a
Change of Control, the Company will be obligated to make an offer to purchase
all outstanding Notes at a purchase price equal to 101% of the principal amount
thereof, together with accrued and unpaid interest, if any, to the date of
purchase and (b) upon certain sales or other dispositions of assets, the Company
may be obligated to make offers to purchase Notes with a portion of the Net
Available Proceeds of such sales or other dispositions at a purchase price equal
to 100% of the principal amount thereof, together with accrued and unpaid
interest, if any, to the date of purchase. See "-- Certain Covenants -- Change
of Control" and "-- Limitation on Asset Sales."
 
RANKING
 
     The Notes will be senior unsecured obligations of the Company and will rank
pari passu in right of payment with all senior Indebtedness of the Company,
senior in right of payment to all Subordinated Indebtedness of the Company and
on a parity with the Company's outstanding Series B Notes. The Notes and the
Subsidiary Guarantees, however, will be effectively subordinated to secured
Indebtedness of the Company and the Subsidiary Guarantors, respectively, with
respect to the assets securing such Indebtedness, including any Indebtedness
under the Revolving Credit Facility, which is secured by liens on substantially
all of the assets of the Company and the Subsidiary Guarantors. Without regard
to the $50 million in principal amount of the Old Notes, the Company and the
Subsidiary Guarantors had no Indebtedness outstanding at August 31, 1997, other
than (i) $2.4 million consisting of letters of credit secured by liens on
substantially all of the assets of the Company and the Subsidiary Guarantors,
which is effectively senior to, although nominally pari passu with, the Notes,
and (ii) $150 million in principal amount of Series B Notes, which ranks pari
passu with the Notes. See "Capitalization." Subject to certain limitations, the
Company and its Subsidiaries may incur additional Indebtedness in the future.
See "-- Certain Covenants -- Limitation on Indebtedness and Disqualified Capital
Stock."
 
SUBSIDIARY GUARANTEES OF NOTES
 
     Each Subsidiary Guarantor will unconditionally guarantee, jointly and
severally, to each Holder and the Trustee, the full and prompt performance of
the Company's obligations under the Indenture and the Notes, including the
payment of principal of, premium, if any, and interest on the Notes pursuant to
its Subsidiary Guarantee. The Subsidiary Guarantors are currently the Company's
principal subsidiaries. In addition to the
 
                                       32
<PAGE>   34
 
current Subsidiary Guarantors, the Company will cause each Restricted Subsidiary
that becomes, or comes into existence as, a Restricted Subsidiary after the date
of the Indenture and has assets, businesses, divisions, real property or
equipment with a fair market value (as determined in good faith by the Board of
Directors of the Company) in excess of $1 million to execute and deliver a
supplement to the Indenture pursuant to which such Restricted Subsidiary will
guarantee the payment of the Notes on the same terms and conditions as the
Subsidiary Guarantees by the initial Subsidiary Guarantors.
 
     The Subsidiary Guarantees will be senior unsecured obligations of each
respective Subsidiary Guarantor and will rank pari passu in right of payment
with all senior Indebtedness of such Subsidiary Guarantor, senior in right of
payment to all Subordinated Indebtedness of such Subsidiary Guarantor and on a
parity with the Company's outstanding Series B Notes. However, the Subsidiary
Guarantees will be effectively subordinated to secured Indebtedness of the
Subsidiary Guarantors, with respect to the assets securing such Indebtedness,
including Indebtedness of the Subsidiary Guarantors under the Revolving Credit
Facility, which is secured by liens on substantially all of their assets. At
August 31, 1997, the Subsidiary Guarantors had no Indebtedness outstanding other
than the Subsidiary Guarantees of the Company's outstanding Series B Notes and
the Old Notes. See "Capitalization."
 
     The obligations of each Subsidiary Guarantor will be limited to the maximum
amount as will, after giving effect to all other contingent and fixed
liabilities of such Subsidiary Guarantor and after giving effect to any
collections from or payments made by or on behalf of any other Subsidiary
Guarantor in respect of the obligations of such other Subsidiary Guarantor under
its Subsidiary Guarantee or pursuant to its contribution obligations under the
Indenture, result in the obligations of such Subsidiary Guarantor under its
Subsidiary Guarantee not constituting a fraudulent conveyance or fraudulent
transfer under federal or state law. Each Subsidiary Guarantor that makes a
payment or distribution under a Subsidiary Guarantee shall be entitled to a
contribution from each other Subsidiary Guarantor in a pro rata amount based on
the Adjusted Net Assets of each Subsidiary Guarantor.
 
     Each Subsidiary Guarantor may consolidate with or merge into or sell or
otherwise dispose of all or substantially all of its properties and assets to
the Company or another Subsidiary Guarantor without limitation, except to the
extent any such transaction is subject to the "Merger, Consolidation and Sale of
Assets" covenant of the Indenture. Each Subsidiary Guarantor may consolidate
with or merge into or sell all or substantially all of its properties and assets
to a Person other than the Company or another Subsidiary Guarantor (whether or
not Affiliated with the Subsidiary Guarantor), provided that (a) if the
surviving Person is not the Subsidiary Guarantor, the surviving Person agrees to
assume such Subsidiary Guarantor's Subsidiary Guarantee and all its obligations
pursuant to the Indenture (except to the extent the following paragraph would
result in the release of such Subsidiary Guarantee) and (b) such transaction
does not (i) violate any of the covenants described below under "-- Certain
Covenants" or (ii) result in a Default or Event of Default immediately
thereafter that is continuing.
 
     Upon the sale or other disposition (by merger or otherwise) of a Subsidiary
Guarantor (or all or substantially all of its properties and assets) to a Person
other than the Company or another Subsidiary Guarantor and pursuant to a
transaction that is otherwise in compliance with the Indenture (including as
described in the foregoing paragraph), such Subsidiary Guarantor shall be deemed
released from its Subsidiary Guarantee and the related obligations set forth in
the Indenture; provided, however, that any such termination shall occur only to
the extent that all obligations of such Subsidiary Guarantor under all of its
guarantees of, and under all of its pledges of assets or other security
interests which secure, other Indebtedness of the Company or any other
Restricted Subsidiary shall also terminate or be released upon such sale or
other disposition. Each Subsidiary Guarantor that is designated as an
Unrestricted Subsidiary in accordance with the Indenture shall be released from
its Subsidiary Guarantee and related obligations set forth in the Indenture for
so long as it remains an Unrestricted Subsidiary.
 
     Separate financial statements of the Subsidiary Guarantors have not been
provided because the Subsidiary Guarantors are jointly and severally liable for
the obligations of the Company under the Notes, and the aggregate assets,
earnings and equity of the Subsidiary Guarantors are substantially equivalent to
the consolidated assets, earnings and equity of the Company.
 
                                       33
<PAGE>   35
 
CERTAIN COVENANTS
 
     The Indenture contains, among others, the covenants described below.
 
     Limitation on Indebtedness and Disqualified Capital Stock.  (a) The Company
will not, and will not permit any of its Restricted Subsidiaries to, create,
incur, issue, assume, guarantee or in any manner become directly or indirectly
liable for the payment of (collectively, "incur") any Indebtedness (including
any Acquired Indebtedness but excluding any Permitted Indebtedness) or any
Disqualified Capital Stock, unless, on a pro forma basis after giving effect to
such incurrence and the application of the proceeds therefrom, the Consolidated
EBITDA Coverage Ratio for the four full quarters immediately preceding such
event, taken as one period, would have been equal to or greater than 2.25 to
1.0. The Company's Consolidated EBITDA Coverage Ratio for the four quarters
ended June 30, 1997 was 3.8 to 1.0.
 
     (b) The Company will not incur any Indebtedness that is expressly
subordinated to any other Indebtedness of the Company unless such Indebtedness,
by its terms or the terms of any agreement or instrument pursuant to which such
Indebtedness is issued or outstanding, is also expressly made subordinate to the
Notes at least to the extent it is subordinated to such other Indebtedness.
 
     Limitation on Restricted Payments.  (a) The Company will not, and will not
permit any Restricted Subsidiary to, directly or indirectly:
 
          (i) declare or pay any dividend on, or make any other distribution to
     holders of, any shares of Capital Stock of the Company (other than
     dividends or distributions payable solely in shares of Qualified Capital
     Stock of the Company or in options, warrants or other rights to purchase
     Qualified Capital Stock of the Company);
 
          (ii) purchase, redeem or otherwise acquire or retire for value any
     Capital Stock of the Company or any Affiliate thereof (other than any
     Restricted Subsidiary) or any options, warrants or other rights to acquire
     such Capital Stock;
 
          (iii) make any principal payment on or repurchase, redeem, defease or
     otherwise acquire or retire for value, prior to any scheduled principal
     payment, scheduled sinking fund payment or maturity, any Subordinated
     Indebtedness, except in any case out of the net cash proceeds of Permitted
     Refinancing Indebtedness; or
 
          (iv) make any Restricted Investment;
 
(such payments or other actions described in clauses (i) through (iv) being
collectively referred to as "Restricted Payments"), unless at the time of and
after giving effect to the proposed Restricted Payment (the amount of any such
Restricted Payment, if other than cash, shall be the amount determined by the
Board of Directors of the Company, whose determination shall be conclusive and
evidenced by a Board Resolution),
 
     (1) no Default or Event of Default shall have occurred and be continuing,
 
     (2) the Company could incur $1.00 of additional Indebtedness (other than
Permitted Indebtedness) in accordance with paragraph (a) of the "-- Limitation
on Indebtedness and Disqualified Capital Stock" covenant, and
 
     (3) the aggregate amount of all Restricted Payments declared or made after
the date of the Series A/B Indenture shall not exceed the sum (without
duplication) of the following:
 
          (A) 50% of the Consolidated Net Income of the Company accrued on a
     cumulative basis during the period beginning on April 1, 1996 and ending on
     the last day of the Company's last fiscal quarter ending prior to the date
     of such proposed Restricted Payment (or, if such Consolidated Net Income is
     a loss, minus 100% of such loss),
 
          (B) the aggregate Net Cash Proceeds received after the date of the
     Series A/B Indenture by the Company from the issuance or sale (other than
     to any of its Restricted Subsidiaries) of shares of Qualified Capital Stock
     of the Company or any options, warrants or rights to purchase such shares
     of Qualified Capital Stock of the Company,
 
                                       34
<PAGE>   36
 
          (C) the aggregate Net Cash Proceeds received after the date of the
     Series A/B Indenture by the Company (other than from any of its Restricted
     Subsidiaries) upon the exercise of any options, warrants or rights to
     purchase shares of Qualified Capital Stock of the Company,
 
          (D) the aggregate Net Cash Proceeds received after the date of the
     Series A/B Indenture by the Company from the issuance or sale (other than
     to any of its Restricted Subsidiaries) of Indebtedness or shares of
     Disqualified Capital Stock that have been converted into or exchanged for
     Qualified Capital Stock of the Company, together with the aggregate cash
     received by the Company at the time of such conversion or exchange,
 
          (E) to the extent not otherwise included in Consolidated Net Income,
     the net reduction in Investments in Unrestricted Subsidiaries resulting
     from dividends, repayments of loans or advances, or other transfers of
     assets, in each case to the Company or a Restricted Subsidiary after the
     date of the Series A/B Indenture from any Unrestricted Subsidiary or from
     the redesignation of an Unrestricted Subsidiary as a Restricted Subsidiary
     (valued in each case as provided in the definition of Investment), not to
     exceed in the case of any Unrestricted Subsidiary the total amount of
     Investments (other than Permitted Investments) in such Unrestricted
     Subsidiary made by the Company and its Restricted Subsidiaries in such
     Unrestricted Subsidiary after the date of the Series A/B Indenture, and
 
          (F) $10 million.
 
     (b) Notwithstanding paragraph (a) above, the Company and its Restricted
Subsidiaries may take the following actions so long as (in the case of clauses
(ii) and (iii) below) no Default or Event of Default shall have occurred and be
continuing:
 
          (i) the payment of any dividend on any Capital Stock of the Company or
     any Restricted Subsidiary within 60 days after the date of declaration
     thereof, if at such declaration date such declaration complied with the
     provisions of paragraph (a) above (and such payment shall be deemed to have
     been paid on such date of declaration for purposes of any calculation
     required by the provisions of paragraph (a) above);
 
          (ii) the repurchase, redemption or other acquisition or retirement of
     any shares of any class of Capital Stock of the Company or any Restricted
     Subsidiary, in exchange for, or out of the aggregate Net Cash Proceeds
     from, a substantially concurrent issuance and sale (other than to a
     Restricted Subsidiary) of shares of Qualified Capital Stock of the Company;
     and
 
          (iii) the repurchase, redemption, repayment, defeasance or other
     acquisition or retirement for value of any Subordinated Indebtedness in
     exchange for, or out of the aggregate Net Cash Proceeds from, a
     substantially concurrent issuance and sale (other than to a Restricted
     Subsidiary) of shares of Qualified Capital Stock of the Company.
 
     The actions described in clauses (i), (ii) and (iii) of this paragraph (b)
shall be Restricted Payments that shall be permitted to be made in accordance
with this paragraph (b) but shall reduce the amount that would otherwise be
available for Restricted Payments under clause (3) of paragraph (a), provided
that any dividend paid pursuant to clause (i) of this paragraph (b) shall reduce
the amount that would otherwise be available under clause (3) of paragraph (a)
when declared, but not also when subsequently paid pursuant to such clause (i).
 
     Limitation on Issuances and Sales of Capital Stock of Restricted
Subsidiaries.  The Company (i) will not permit any Restricted Subsidiary to
issue or sell any Capital Stock to any Person other than the Company or a Wholly
Owned Restricted Subsidiary and (ii) will not permit any Person other than the
Company or a Wholly Owned Restricted Subsidiary to own any Capital Stock of any
Restricted Subsidiary, in each case except with respect to a Wholly Owned
Restricted Subsidiary as described in clause (i) or (ii) of the definition of
"Wholly Owned Restricted Subsidiary".
 
     Limitation on Sale/Leaseback Transactions.  The Company will not, and will
not permit any Restricted Subsidiary to, directly or indirectly, enter into,
assume, guarantee or otherwise become liable with respect to any Sale/Leaseback
Transaction unless the Company or such Restricted Subsidiary, as the case may
be,
 
                                       35
<PAGE>   37
 
would be able to incur Indebtedness (not including the incurrence of Permitted
Indebtedness) in an amount equal to the Attributable Indebtedness with respect
to such Sale/Leaseback Transaction pursuant to paragraph (a) of the "Limitation
on Indebtedness and Disqualified Capital Stock" covenant, the Company or such
Restricted Subsidiary receives proceeds from such Sale/Leaseback Transaction at
least equal to the fair market value of the property or assets subject thereto
(as determined in good faith by the Company's Board of Directors, whose
determination in good faith and evidenced by a Board Resolution will be
conclusive) and the Company applies an amount in cash equal to the Net Available
Proceeds of the Sale/Leaseback Transaction in accordance with the provisions of
the "Limitation on Asset Sales" covenant as if such Sale/Leaseback Transaction
were an Asset Sale.
 
     Limitation on Transactions with Affiliates.  The Company will not, and will
not permit any Restricted Subsidiary to, directly or indirectly, enter into or
suffer to exist any transaction or series of related transactions (including,
without limitation, the sale, purchase, exchange or lease of assets or property
or the rendering of any services) with, or for the benefit of, any Affiliate of
the Company (other than the Company or a Restricted Subsidiary), unless (i) such
transaction or series of transactions is on terms that are no less favorable to
the Company or such Restricted Subsidiary, as the case may be, than those that
would be available in a comparable arm's length transaction with unrelated third
parties, (ii) with respect to any one transaction or series of related
transactions involving aggregate payments in excess of $1 million, the Company
delivers an Officers' Certificate to the Trustee certifying that such
transaction or series of related transactions complies with clause (i) above,
(iii) with respect to a transaction or series of related transactions involving
payments in excess of $5 million but less than $15 million in the aggregate, the
Company delivers an Officers' Certificate to the Trustee certifying that (A)
such transaction or series of related transactions complies with clause (i)
above and (B) such transaction or series of related transactions has been
approved by a majority of the Disinterested Directors of the Company, and (iv)
with respect to any one transaction or series of related transactions involving
aggregate payments in excess of $15 million, the Company delivers an Officers'
Certificate to the Trustee certifying to the two matters referred to in clause
(iii) above and that the Company has obtained a written opinion from an
independent nationally recognized investment banking firm or appraisal firm
specializing or having a speciality in the type and subject matter of the
transaction or series of related transactions at issue, which opinion shall be
to the effect set forth in clause (i) above or shall state that such transaction
or series of related transactions is fair from a financial point of view to the
Company or such Restricted Subsidiary; provided, however, that the foregoing
restriction shall not apply to (w) loans or advances to officers, directors and
employees of the Company or any Restricted Subsidiary made in the ordinary
course of business and consistent with past practices of the Company and its
Restricted Subsidiaries in an aggregate amount not to exceed $1 million
outstanding at any one time, (x) indemnities of officers, directors and
employees of the Company or any Restricted Subsidiary permitted by bylaw or
statutory provisions, (y) the payment of reasonable and customary regular fees
to directors of the Company or any of its Restricted Subsidiaries who are not
employees of the Company or any Affiliate and (z) the Company's employee
compensation and other benefit arrangements.
 
     Limitation on Liens.  The Company will not, and will not permit any
Restricted Subsidiary to, directly or indirectly, create, incur, assume, affirm
or suffer to exist or become effective any Lien of any kind, except for
Permitted Liens, upon any of their respective property or assets, whether now
owned or acquired after the date of the Series A/B Indenture, or any income,
profits or proceeds therefrom, to secure (a) any Indebtedness of the Company or
such Restricted Subsidiary (if it is not also a Subsidiary Guarantor), unless
prior to, or contemporaneously therewith, the Notes are equally and ratably
secured, or (b) any Indebtedness of any Subsidiary Guarantor, unless prior to,
or contemporaneously therewith, the Subsidiary Guarantees are equally and
ratably secured; provided, however, that if such Indebtedness is expressly
subordinated to the Notes or the Subsidiary Guarantees, the Lien securing such
Indebtedness will be subordinated and junior to the Lien securing the Notes or
the Subsidiary Guarantees, as the case may be, with the same relative priority
as such Indebtedness has with respect to the Notes or the Subsidiary Guarantees.
The foregoing covenant will not apply to any Lien securing Acquired
Indebtedness, provided that any such Lien extends only to the property or assets
that were subject to such Lien prior to the related acquisition by the Company
or such Restricted Subsidiary and was not created, incurred or assumed in
contemplation of such transaction. The incurrence of additional secured
Indebtedness by the Company and its Restricted Subsidiaries is subject to
 
                                       36
<PAGE>   38
 
further limitations on the incurrence of Indebtedness as described under
"-- Limitation on Indebtedness and Disqualified Capital Stock."
 
     Change of Control.  Upon the occurrence of a Change of Control, the Company
will be obligated to make an offer to purchase all of the then outstanding Notes
(a "Change of Control Offer"), and will purchase, on a Business Day (the "Change
of Control Purchase Date") not more than 60 nor less than 30 days following such
Change of Control, all of the then outstanding Notes validly tendered pursuant
to such Change of Control Offer and not withdrawn, at a purchase price (the
"Change of Control Purchase Price") equal to 101% of the principal amount
thereof plus accrued and unpaid interest, if any, to the Change of Control
Purchase Date. The Change of Control Offer is required to remain open for at
least 20 Business Days and until the close of business on the fifth Business Day
prior to the Change of Control Purchase Date.
 
     In order to effect such Change of Control Offer, the Company will, not
later than the 30th day after the Change of Control, mail to the Trustee and
each Holder a notice of the Change of Control Offer, which notice shall govern
the terms of the Change of Control Offer and shall state, among other things,
the procedures that Holders must follow to accept the Change of Control Offer.
 
     The occurrence of a Change of Control may result in the lender under the
Revolving Credit Facility having the right to require the Company to repay all
Indebtedness outstanding thereunder. There can be no assurance that the Company
will have available funds sufficient to repay all Indebtedness owing under the
Revolving Credit Facility or to fund the purchase of the Notes or the Series B
Notes upon a Change of Control. In the event a Change of Control occurs at a
time when the Company does not have available funds sufficient to pay the Change
of Control Purchase Price for all of the Notes delivered by Holders seeking to
accept the Change of Control Offer, an Event of Default would occur under the
Indenture. The definition of Change of Control includes an event by which the
Company sells, conveys, transfers, leases or otherwise disposes of all or
substantially all of the properties and assets of the Company and its Restricted
Subsidiaries, taken as a whole; the phrase "all or substantially all" is subject
to applicable legal precedent and, as a result, in the future there may be
uncertainty as to whether or not a Change of Control has occurred.
 
     The Company will not be required to make a Change of Control Offer upon a
Change of Control if another Person makes the Change of Control Offer at the
same purchase price, at the same time and otherwise in substantial compliance
with the requirements applicable to a Change of Control Offer to be made by the
Company and purchases all Notes validly tendered and not withdrawn under such
Change of Control Offer.
 
     The Company will comply with Rule 14e-1 under the Exchange Act and any
other securities laws and regulations thereunder, if applicable, in the event
that a Change of Control occurs and the Company is required to purchase Notes as
described above. The existence of a Holder's right to require, subject to
certain conditions, the Company to repurchase its Notes upon a Change of Control
may deter a third party from acquiring the Company in a transaction that
constitutes, or results in, a Change of Control.
 
     Limitation on Asset Sales.  (a) The Company will not, and will not permit
any Restricted Subsidiary to, engage in any Asset Sale unless (i) the Company or
such Restricted Subsidiary, as the case may be, receives consideration at the
time of such Asset Sale at least equal to the fair market value of the assets
and properties sold or otherwise disposed of pursuant to the Asset Sale (as
determined by the Board of Directors of the Company, whose determination in good
faith shall be conclusive and evidenced by a Board Resolution), (ii) at least
75% of the consideration received by the Company or the Restricted Subsidiary,
as the case may be, in respect of such Asset Sale consists of cash or Cash
Equivalents and (iii) the Company delivers to the Trustee an Officers'
Certificate certifying that such Asset Sale complies with clauses (i) and (ii).
The amount (without duplication) of any Indebtedness (other than Subordinated
Indebtedness) of the Company or such Restricted Subsidiary that is expressly
assumed by the transferee in such Asset Sale and with respect to which the
Company or such Restricted Subsidiary, as the case may be, is unconditionally
released by the holder of such Indebtedness, shall be deemed to be cash or Cash
Equivalents for purposes of clause (ii) and shall also be deemed to constitute a
repayment of, and a permanent reduction in, the amount of such Indebtedness for
purposes of the following paragraph.
 
                                       37
<PAGE>   39
 
     (b) If the Company or any Restricted Subsidiary engages in an Asset Sale or
incurs an Event of Loss, the Company or such Restricted Subsidiary may either,
no later than 365 days after such Asset Sale or such Event of Loss, (i) apply
all or any of the Net Available Proceeds therefrom to repay Indebtedness (other
than Subordinated Indebtedness) of the Company or any Restricted Subsidiary,
provided, in each case, that the related loan commitment (if any) is thereby
permanently reduced by the amount of such Indebtedness so repaid, or (ii) invest
all or any part of the Net Available Proceeds thereof in properties and assets
that replace the properties or assets that were the subject of such Asset Sale
or such Event of Loss, as the case may be, or in other properties or assets that
will be used in the business of the Company and its Restricted Subsidiaries. The
amount of such Net Available Proceeds not applied or invested as provided in
this paragraph will constitute "Excess Proceeds."
 
     (c) When the aggregate amount of Excess Proceeds equals or exceeds $10
million, the Company will be required to make an offer to purchase (a "Series B
Net Proceeds Offer") from all Holders of the outstanding Series B Notes in
accordance with the procedures set forth in the Series A/B Indenture the maximum
principal amount (expressed as a multiple of $1,000) of outstanding Series B
Notes that may be purchased out of the amount of such Excess Proceeds.
 
     (d) To the extent that any Excess Proceeds are not applied to the Series B
Net Proceeds Offer, the Company will be required to make an offer to purchase
from all Holders of the Notes an aggregate principal amount of Notes equal to
such Excess Proceeds as follows:
 
          (i) The Company will make an offer to purchase (a "Net Proceeds
     Offer") from all Holders of Notes in accordance with the procedures set
     forth in the Indenture the maximum principal amount (expressed as a
     multiple of $1,000) of Notes that may be purchased out of the amount (the
     "Payment Amount") of such Excess Proceeds.
 
          (ii) The offer price for the Notes will be payable in cash in an
     amount equal to 100% of the principal amount of the Notes tendered pursuant
     to a Net Proceeds Offer, plus accrued and unpaid interest, if any, to the
     date such Net Proceeds Offer is consummated (the "Offered Price"), in
     accordance with the procedures set forth in the Indenture. To the extent
     that the aggregate Offered Price of the Notes tendered pursuant to a Net
     Proceeds Offer is less than the Payment Amount relating thereto (such
     shortfall constituting a "Net Proceeds Deficiency"), the Company may use
     such Net Proceeds Deficiency, or a portion thereof, for general corporate
     purposes, subject to the limitations of the "Limitation on Restricted
     Payments" covenant.
 
          (iii) If the aggregate Offered Price of Notes validly tendered and not
     withdrawn by Holders thereof exceeds the Payment Amount, Notes to be
     purchased will be selected on a pro rata basis.
 
          (iv) Upon completion of such Net Proceeds Offer, the amount of Excess
     Proceeds shall be reset to zero.
 
The Company will not permit any Restricted Subsidiary to enter into or suffer to
exist any agreement that would place any restriction of any kind (other than
pursuant to law or regulation) on the ability of the Company to make a Net
Proceeds Offer following any Asset Sale. The Company will comply with Rule 14e-1
under the Exchange Act, and any other securities laws and regulations
thereunder, if applicable, in the event that an Asset Sale occurs and the
Company is required to purchase Notes as described above.
 
     Limitation on Guarantees by Subsidiary Guarantors.  The Company will not
permit any Subsidiary Guarantor to guarantee the payment of any Subordinated
Indebtedness of the Company unless such guarantee shall be subordinated to such
Subsidiary Guarantor's Subsidiary Guarantee at least to the same extent as such
Subordinated Indebtedness is subordinated to the Notes; provided, however, that
this covenant will not be applicable to any guarantee of any Subsidiary
Guarantor that (i) existed at the time such Person became a Subsidiary of the
Company and (ii) was not incurred in connection with, or in contemplation of,
such Person becoming a Subsidiary of the Company.
 
     Limitation on Dividends and Other Payment Restrictions Affecting Restricted
Subsidiaries.  The Company will not, and will not permit any Restricted
Subsidiary to, directly or indirectly, create or suffer to
 
                                       38
<PAGE>   40
 
exist or allow to become effective any consensual encumbrance or restriction of
any kind on the ability of any Restricted Subsidiary (a) to pay dividends, in
cash or otherwise, or make any other distributions on its Capital Stock, or make
payments on any Indebtedness owed, to the Company or any other Restricted
Subsidiary, (b) to make loans or advances to the Company or any other Restricted
Subsidiary, (c) to transfer any of its property or assets to the Company or any
other Restricted Subsidiary or (d) to guarantee the Notes (any such restrictions
being collectively referred to herein as a "Payment Restriction"), except in any
such case for such encumbrances or restrictions existing under or by reason of
(i) the Indenture, the Revolving Credit Facility or any other agreement in
effect or entered into on the date of the Series A/B Indenture, or (ii) any
agreement, instrument or charter of or in respect of a Restricted Subsidiary
entered into prior to the date on which such Restricted Subsidiary became a
Restricted Subsidiary and outstanding on such date and not entered into in
connection with or in contemplation of becoming a Restricted Subsidiary,
provided such consensual encumbrance or restriction is not applicable to any
properties or assets other than those owned or held by the Restricted Subsidiary
at the time it became a Restricted Subsidiary or subsequently acquired by such
Restricted Subsidiary other than from the Company or any other Restricted
Subsidiary, or (iii) pursuant to an agreement effecting a modification, renewal,
refinancing, replacement or extension of any agreement, instrument or charter
(other than the Indenture) referred to in clause (i) or (ii) above, provided,
however, that the provisions relating to such encumbrance or restriction are not
materially less favorable to the Holders of the Notes than those under or
pursuant to the agreement, instrument or charter so modified, renewed,
refinanced, replaced or extended, or (iv) customary provisions restricting the
subletting or assignment of any lease or the transfer of copyrighted or patented
materials, or (v) provisions in agreements that restrict the assignment of such
agreements or rights thereunder, or (vi) the sale or other disposition of any
properties or assets subject to a Lien securing Indebtedness.
 
     Limitation on Conduct of Business.  The Company will not, and will not
permit any of its Restricted Subsidiaries to, engage in the conduct of any
business other than the businesses being conducted on the date of the Series A/B
Indenture (and described therein and herein) and such other businesses as are
reasonably necessary or desirable to facilitate the conduct and operation of
such businesses.
 
     Reports.  The Company will file on a timely basis with the Commission, to
the extent such filings are accepted by the Commission and whether or not the
Company has a class of securities registered under the Exchange Act, the annual
reports, quarterly reports and other documents that the Company would be
required to file if it were subject to Section 13 or 15 of the Exchange Act. The
Company will also be required (a) to file with the Trustee (with exhibits), and
provide to each Holder of Notes (without exhibits), without cost to such Holder,
copies of such reports and documents within 15 days after the date on which the
Company files such reports and documents with the Commission or the date on
which the Company would be required to file such reports and documents if the
Company were so required and (b) if filing such reports and documents with the
Commission is not accepted by the Commission or is prohibited under the Exchange
Act, to supply at its cost copies of such reports and documents (including any
exhibits thereto) to any Holder of Notes, securities analyst or prospective
investor promptly upon written request.
 
     Future Designation of Restricted and Unrestricted Subsidiaries.  The
foregoing covenants (including calculation of financial ratios and the
determination of limitations on the incurrence of Indebtedness and Liens) may be
affected by the designation by the Company of any existing or future Subsidiary
of the Company as an Unrestricted Subsidiary. The definition of "Unrestricted
Subsidiary" set forth under the caption "-- Certain Definitions" describes the
circumstances under which a Subsidiary of the Company may be designated as an
Unrestricted Subsidiary by the Board of Directors of the Company.
 
MERGER, CONSOLIDATION AND SALE OF ASSETS
 
     The Company will not, in any single transaction or series of related
transactions, merge or consolidate with or into any other Person, or sell,
assign, convey, transfer, lease or otherwise dispose of all or substantially all
of the properties and assets of the Company and its Restricted Subsidiaries on a
consolidated basis to any Person or group of Affiliated Persons, and the Company
will not permit any of its Restricted Subsidiaries to enter into any such
transaction or series of transactions if such transaction or series of
transactions, in the aggregate, would result in the sale, assignment,
conveyance, transfer, lease or other disposition of all or
 
                                       39
<PAGE>   41
 
substantially all of the properties and assets of the Company and its Restricted
Subsidiaries on a consolidated basis to any other Person or group of Affiliated
Persons, unless at the time and after giving effect thereto: (i) either (A) if
the transaction is a merger or consolidation, the Company shall be the surviving
Person of such merger or consolidation, or (B) the Person (if other than the
Company) formed by such consolidation or into which the Company is merged or to
which the properties and assets of the Company or its Restricted Subsidiaries,
as the case may be, are sold, assigned, conveyed, transferred, leased or
otherwise disposed of (any such surviving Person or transferee Person being the
"Surviving Entity") shall be a corporation organized and existing under the laws
of the United States of America, any state thereof or the District of Columbia
and shall, in either case, expressly assume by a supplemental indenture to the
Indenture executed and delivered to the Trustee, in form satisfactory to the
Trustee, all the obligations of the Company under the Notes and the Indenture,
and, in each case, the Indenture shall remain in full force and effect; (ii)
immediately before and immediately after giving effect to such transaction or
series of transactions on a pro forma basis (and treating any Indebtedness not
previously an obligation of Company or any of its Restricted Subsidiaries which
becomes an obligation of the Company or any of its Restricted Subsidiaries in
connection with or as a result of such transaction or transactions as having
been incurred at the time of such transaction or transactions), no Default or
Event of Default shall have occurred and be continuing; (iii) except in the case
of the consolidation or merger of any Restricted Subsidiary with or into the
Company, immediately after giving effect to such transaction or transactions on
a pro forma basis, the Consolidated Net Worth of the Company (or the Surviving
Entity if the Company is not the continuing obligor under the Indenture) is at
least equal to the Consolidated Net Worth of the Company immediately before such
transaction or transactions; (iv) except in the case of the consolidation or
merger of the Company with or into a Restricted Subsidiary or any Restricted
Subsidiary with or into the Company or another Restricted Subsidiary,
immediately before and immediately after giving effect to such transaction or
transactions on a pro forma basis (assuming that the transaction or transactions
occurred on the first day of the period of four fiscal quarters ending
immediately prior to the consummation of such transaction or transactions, with
the appropriate adjustments with respect to the transaction or transactions
being included in such pro forma calculation), the Company (or the Surviving
Entity if the Company is not the continuing obligor under the Indenture) could
incur $1.00 of additional Indebtedness (other than Permitted Indebtedness)
pursuant to the first paragraph of the "-- Limitation on Indebtedness and
Disqualified Capital Stock" covenant; (v) if the Company is not the continuing
obligor under the Indenture, then each Subsidiary Guarantor, unless it is the
Surviving Entity, shall have by supplemental indenture to the Indenture
confirmed that its Subsidiary Guarantee of the Notes shall apply to the
Surviving Entity's obligations under the Indenture and the Notes; (vi) if any of
the properties or assets of the Company or any of its Restricted Subsidiaries
would upon such transaction or series of related transactions become subject to
any Lien (other than a Permitted Lien), the creation and imposition of such Lien
shall have been in compliance with the "Limitation on Liens" covenant; and (vii)
the Company (or the Surviving Entity if the Company is not the continuing
obligor under the Indenture) shall have delivered to the Trustee, in form and
substance reasonably satisfactory to the Trustee, (a) an Officers' Certificate
stating that such consolidation, merger, transfer, lease or other disposition
and any supplemental indenture in respect thereto comply with the requirements
under the Indenture and (b) an Opinion of Counsel stating that the requirements
of clause (i) of this paragraph have been satisfied.
 
     Upon any consolidation or merger or any sale, assignment, lease,
conveyance, transfer or other disposition of all or substantially all of the
properties and assets of the Company and its Restricted Subsidiaries on a
consolidated basis in accordance with the foregoing, in which the Company is not
the continuing corporation, the Surviving Entity shall succeed to, and be
substituted for, and may exercise every right and power of, the Company under
the Indenture with the same effect as if the Surviving Entity had been named as
the Company therein, and thereafter the Company, except in the case of a lease,
will be discharged from all obligations and covenants under the Indenture and
the Notes and may be liquidated and dissolved.
 
                                       40
<PAGE>   42
 
EVENTS OF DEFAULT
 
     The following will be "Events of Default" under the Indenture:
 
          (i) default in the payment of the principal of or premium, if any, on
     any of the Notes, whether such payment is due at Stated Maturity, upon
     redemption, upon repurchase pursuant to a Change of Control Offer or a Net
     Proceeds Offer, upon acceleration or otherwise; or
 
          (ii) default in the payment of any installment of interest on any of
     the Notes, when due, and the continuance of such default for a period of 30
     days; or
 
          (iii) default in the performance or breach of the provisions of the
     "Merger, Consolidation and Sale of Assets" section of the Indenture, the
     failure to make or consummate a Change of Control Offer in accordance with
     the provisions of the "Change of Control" covenant or the failure to make
     or consummate a Net Proceeds Offer in accordance with the provisions of the
     "Limitation on Asset Sales" covenant; or
 
          (iv) the Company or any Subsidiary Guarantor shall fail to perform or
     observe any other term, covenant or agreement contained in the Notes, any
     Subsidiary Guarantee or the Indenture (other than a default specified in
     (i), (ii) or (iii) above) for a period of 45 days after written notice of
     such failure stating that it is a "notice of default" under the Indenture
     and requiring the Company or such Subsidiary Guarantor to remedy the same
     shall have been given (x) to the Company by the Trustee or (y) to the
     Company and the Trustee by the Holders of at least 25% in aggregate
     principal amount of the Notes then outstanding; or
 
          (v) the occurrence and continuation beyond any applicable grace period
     of any default in the payment of the principal of, premium, if any, or
     interest on any Indebtedness of the Company (other than the Notes) or any
     Subsidiary Guarantor or any other Restricted Subsidiary for money borrowed
     when due, or any other default resulting in acceleration of any
     Indebtedness of the Company or any Subsidiary Guarantor or any other
     Restricted Subsidiary for money borrowed, provided that the aggregate
     principal amount of such Indebtedness shall exceed $5 million and provided,
     further, that if any such default is cured or waived or any such
     acceleration rescinded, or such Indebtedness is repaid, within a period of
     10 days from the continuation of such default beyond the applicable grace
     period or the occurrence of such acceleration, as the case may be, such
     Event of Default under the Indenture and any consequential acceleration of
     the Notes shall be automatically rescinded, so long as such rescission does
     not conflict with any judgment or decree; or
 
          (vi) any Subsidiary Guarantee shall for any reason cease to be, or be
     asserted by the Company or any Subsidiary Guarantor, as applicable, not to
     be, in full force and effect (except pursuant to the release of any such
     Subsidiary Guarantee in accordance with the Indenture); or
 
          (vii) final judgments or orders rendered against the Company or any
     Subsidiary Guarantor or any other Restricted Subsidiary that are
     unsatisfied and that require the payment in money, either individually or
     in an aggregate amount, that is more than $5 million over the coverage
     under applicable insurance policies and either (A) commencement by any
     creditor of an enforcement proceeding upon such judgment (other than a
     judgment that is stayed by reason of pending appeal or otherwise) or (B)
     the occurrence of a 60-day period during which a stay of such judgment or
     order, by reason of pending appeal or otherwise, was not in effect; or
 
          (viii) the entry of a decree or order by a court having jurisdiction
     in the premises (A) for relief in respect of the Company or any Subsidiary
     Guarantor or any other Restricted Subsidiary in an involuntary case or
     proceeding under any applicable federal or state bankruptcy, insolvency,
     reorganization or other similar law or (B) adjudging the Company or any
     Subsidiary Guarantor or any other Restricted Subsidiary bankrupt or
     insolvent, or approving a petition seeking reorganization, arrangement,
     adjustment or composition of the Company or any Subsidiary Guarantor or any
     other Restricted Subsidiary under any applicable federal or state law, or
     appointing under any such law a custodian, receiver, liquidator, assignee,
     trustee, sequestrator or other similar official of the Company or any
     Subsidiary Guarantor or any
 
                                       41
<PAGE>   43
 
     other Restricted Subsidiary or of a substantial part of its consolidated
     assets, or ordering the winding up or liquidation of its affairs, and the
     continuance of any such decree or order for relief or any such other decree
     or order unstayed and in effect for a period of 60 consecutive days; or
 
          (ix) the commencement by the Company or any Subsidiary Guarantor or
     any other Restricted Subsidiary of a voluntary case or proceeding under any
     applicable federal or state bankruptcy, insolvency, reorganization or other
     similar law or any other case or proceeding to be adjudicated bankrupt or
     insolvent, or the consent by the Company or any Subsidiary Guarantor or any
     other Restricted Subsidiary to the entry of a decree or order for relief in
     respect thereof in an involuntary case or proceeding under any applicable
     federal or state bankruptcy, insolvency, reorganization or other similar
     law or to the commencement of any bankruptcy or insolvency case or
     proceeding against it, or the filing by the Company or any Subsidiary
     Guarantor or any other Restricted Subsidiary of a petition or consent
     seeking reorganization or relief under any applicable federal or state law,
     or the consent by it under any such law to the filing of any such petition
     or to the appointment of or taking possession by a custodian, receiver,
     liquidator, assignee, trustee or sequestrator (or other similar official)
     of the Company or any Subsidiary Guarantor or any other Restricted
     Subsidiary or of any substantial part of its consolidated assets, or the
     making by it of an assignment for the benefit of creditors under any such
     law, or the admission by it in writing of its inability to pay its debts
     generally as they become due or taking of corporate action by the Company
     or any Subsidiary Guarantor or any other Restricted Subsidiary in
     furtherance of any such action.
 
     If an Event of Default (other than as specified in clause (viii) or (ix)
above) shall occur and be continuing, the Trustee, by written notice to the
Company, or the Holders of at least 25% in aggregate principal amount of the
Notes then outstanding, by written notice to the Trustee and the Company, may,
and the Trustee upon the request of the Holders of not less than 25% in
aggregate principal amount of the Notes then outstanding shall, declare the
principal of, premium, if any, and accrued and unpaid interest on all of the
Notes due and payable immediately, upon which declaration all amounts payable in
respect of the Notes shall be immediately due and payable. If an Event of
Default specified in clause (viii) or (ix) above occurs and is continuing, then
the principal of, premium, if any, and accrued and unpaid interest on all of the
Notes shall become and be immediately due and payable without any declaration,
notice or other act on the part of the Trustee or any Holder of Notes.
 
     After a declaration of acceleration under the Indenture, but before a
judgment or decree for payment of the money due has been obtained by the
Trustee, the Holders of a majority in aggregate principal amount of the
outstanding Notes, by written notice to the Company, the Subsidiary Guarantors
and the Trustee, may rescind and annul such declaration if (a) the Company or
any Subsidiary Guarantor has paid or deposited with the Trustee a sum sufficient
to pay (i) all sums paid or advanced by the Trustee under the Indenture and the
reasonable compensation, expenses, disbursements and advances of the Trustee,
its agents and counsel, (ii) all overdue interest on all Notes, (iii) the
principal of and premium, if any, on any Notes which have become due otherwise
than by such declaration of acceleration and interest thereon at the rate borne
by the Notes, and (iv) to the extent that payment of such interest is lawful,
interest upon overdue interest and overdue principal at the rate borne by the
Notes (without duplication of any amount paid or deposited pursuant to clause
(ii) or (iii)); (b) the rescission would not conflict with any judgment or
decree of a court of competent jurisdiction; and (c) all Events of Default,
other than the non-payment of principal of, premium, if any, or interest on the
Notes that has become due solely by such declaration of acceleration, have been
cured or waived.
 
     No Holder will have any right to institute any proceeding with respect to
the Indenture or any remedy thereunder, unless such Holder has notified the
Trustee of a continuing Event of Default and the Holders of at least 25% in
aggregate principal amount of the outstanding Notes have made written request,
and offered reasonable indemnity, to the Trustee to institute such proceeding as
Trustee under the Notes and the Indenture, the Trustee has failed to institute
such proceeding within 60 days after receipt of such notice and the Trustee,
within such 60-day period, has not received directions inconsistent with such
written request by Holders of a majority in aggregate principal amount of the
outstanding Notes. Such limitations will not apply,
 
                                       42
<PAGE>   44
 
however, to a suit instituted by the Holder of a Note for the enforcement of the
payment of the principal of, premium, if any, or interest on such Note on or
after the respective due dates expressed in such Note.
 
     During the existence of an Event of Default, the Trustee will be required
to exercise such rights and powers vested in it under the Indenture and use the
same degree of care and skill in its exercise thereof as a prudent person would
exercise under the circumstances in the conduct of such person's own affairs.
Subject to the provisions of the Indenture relating to the duties of the Trustee
in case an Event of Default shall occur and be continuing, the Trustee will not
be under any obligation to exercise any of its rights or powers under the
Indenture at the request or direction of any of the Holders unless such Holders
shall have offered to the Trustee reasonable security or indemnity. Subject to
certain provisions concerning the rights of the Trustee, the Holders of a
majority in aggregate principal amount of the outstanding Notes will have the
right to direct the time, method and place of conducting any proceeding for any
remedy available to the Trustee, or exercising any trust or power conferred on
the Trustee under the Indenture.
 
     If a Default occurs and is continuing and is known to the Trustee, the
Trustee shall mail to each Holder notice of the Default within 60 days after the
occurrence thereof. Except in the case of a Default in payment of principal of,
premium, if any, or interest on any Notes, the Trustee may withhold the notice
to the Holders of the Notes if the Trustee determines in good faith that
withholding the notice is in the interest of the Holders of the Notes.
 
     The Company will be required to furnish to the Trustee annual and quarterly
statements as to the performance by the Company of its obligations under the
Indenture and as to any default in such performance. The Company will also be
required to notify the Trustee within 10 days of any Default or Event of
Default.
 
LEGAL DEFEASANCE OR COVENANT DEFEASANCE OF INDENTURE
 
     The Company may, at its option and at any time, terminate the obligations
of the Company and the Subsidiary Guarantors with respect to the outstanding
Notes (such action being a "legal defeasance"). Such legal defeasance means that
the Company and the Subsidiary Guarantors shall be deemed to have paid and
discharged the entire Indebtedness represented by the outstanding Notes and to
have been discharged from all their other obligations with respect to the Notes
and the Subsidiary Guarantees, except for (i) the rights of Holders of
outstanding Notes to receive payment in respect of the principal of, premium, if
any, and interest on such Notes when such payments are due, (ii) the Company's
obligations to replace any temporary Notes, register the transfer or exchange of
any Notes, replace mutilated, destroyed, lost or stolen Notes and maintain an
office or agency for payments in respect of the Notes, (iii) the rights, powers,
trusts, duties and immunities of the Trustee, and (iv) the legal defeasance
provisions of the Indenture. In addition, the Company may, at its option and at
any time, elect to terminate the obligations of the Company and each Subsidiary
Guarantor with respect to certain covenants that are set forth in the Indenture,
some of which are described under "-- Certain Covenants" above, and any omission
to comply with such obligations shall not constitute a Default or an Event of
Default with respect to the Notes (such action being a "covenant defeasance").
In the event covenant defeasance occurs, certain events (not including
nonpayment, bankruptcy, insolvency and reorganization events) described under
"Events of Default" will no longer constitute an Event of Default with respect
to the Notes.
 
     In order to exercise either legal defeasance or covenant defeasance, (i)
the Company or any Subsidiary Guarantor must irrevocably deposit with the
Trustee, in trust, for the benefit of the Holders of the Notes, cash in United
States dollars, U.S. Government Obligations (as defined in the Indenture), or a
combination thereof, in such amounts as will be sufficient, in the opinion of a
nationally recognized firm of independent public accountants, to pay the
principal of, premium, if any, and interest on the outstanding Notes to
redemption or maturity; (ii) the Company shall have delivered to the Trustee an
Opinion of Counsel to the effect that the Holders of the outstanding Notes will
not recognize income, gain or loss for federal income tax purposes as a result
of such legal defeasance or covenant defeasance and will be subject to federal
income tax on the same amounts, in the same manner and at the same times as
would have been the case if such legal defeasance or covenant defeasance had not
occurred (in the case of legal defeasance, such opinion must refer to and be
based upon a published ruling of the Internal Revenue Service or a change in
applicable federal
 
                                       43
<PAGE>   45
 
income tax laws); (iii) no Default or Event of Default shall have occurred and
be continuing on the date of such deposit or insofar as clauses (viii) and (ix)
under the first paragraph of "Events of Default" are concerned, at any time
during the period ending on the 91st day after the date of deposit; (iv) such
legal defeasance or covenant defeasance shall not cause the Trustee to have a
conflicting interest under the Indenture or the Trust Indenture Act with respect
to any securities of the Company or any Subsidiary Guarantor; (v) such legal
defeasance or covenant defeasance shall not result in a breach or violation of,
or constitute a default under, any material agreement or instrument to which the
Company or any Subsidiary Guarantor is a party or by which it is bound; and (vi)
the Company shall have delivered to the Trustee an Officers' Certificate and an
Opinion of Counsel satisfactory to the Trustee, which, taken together, state
that all conditions precedent under the Indenture to either legal defeasance or
covenant defeasance, as the case may be, have been complied with.
 
SATISFACTION AND DISCHARGE
 
     The Indenture will be discharged and will cease to be of further effect
(except as to surviving rights of registration of transfer or exchange of the
Notes, as expressly provided for in the Indenture) as to all outstanding Notes
when (i) either (a) all the Notes theretofore authenticated and delivered
(except lost, stolen, mutilated or destroyed Notes which have been replaced or
paid and Notes for whose payment money or certain United States government
obligations have theretofore been deposited in trust or segregated and held in
trust by the Company and thereafter repaid to the Company or discharged from
such trust) have been delivered to the Trustee for cancellation or (b) all Notes
not theretofore delivered to the Trustee for cancellation have become due and
payable or will become due and payable at their Stated Maturity within one year,
or are to be called for redemption within one year under arrangements
satisfactory to the Trustee for the serving of notice of redemption by the
Trustee in the name, and at the expense, of the Company, and the Company has
irrevocably deposited or caused to be deposited with the Trustee funds in an
amount sufficient to pay and discharge the entire Indebtedness on the Notes not
theretofore delivered to the Trustee for cancellation, for principal of,
premium, if any, and interest on the Notes to the date of deposit (in the case
of Notes which have become due and payable) or to the Stated Maturity or
Redemption Date, as the case may be, together with instructions from the Company
irrevocably directing the Trustee to apply such funds to the payment thereof at
maturity or redemption, as the case may be; (ii) the Company has paid all other
sums payable under the Indenture by the Company; and (iii) the Company has
delivered to the Trustee an Officers' Certificate and an Opinion of Counsel
which, taken together, state that all conditions precedent under the Indenture
relating to the satisfaction and discharge of the Indenture have been complied
with.
 
AMENDMENTS AND WAIVERS
 
     From time to time, the Company, the Subsidiary Guarantors and the Trustee
may, without the consent of the Holders of the Notes, amend or supplement the
Indenture or the Notes for certain specified purposes, including, among other
things, curing ambiguities, defects or inconsistencies, qualifying, or
maintaining the qualification of, the Indenture under the Trust Indenture Act,
adding or releasing any Subsidiary Guarantor pursuant to the terms of the
Indenture, or making any change that does not materially adversely affect the
rights of any Holder of Notes. Other amendments and modifications of the
Indenture or the Notes may be made by the Company, the Subsidiary Guarantors and
the Trustee with the consent of the Holders of not less than a majority of the
aggregate principal amount of the outstanding Notes; provided, however, that no
such modification or amendment may, without the consent of the Holder of each
outstanding Note affected thereby, (a) change the Stated Maturity of the
principal of, or any installment of interest on, any Note, (b) reduce the
principal amount of, premium, if any, or interest on any Note, (c) change the
coin or currency of payment of principal of, premium, if any, or interest on,
any Note, (d) impair the right to institute suit for the enforcement of any
payment on or with respect to any Note, (e) reduce the above-stated percentage
of aggregate principal amount of outstanding Notes necessary to modify or amend
the Indenture, (f) reduce the percentage of aggregate principal amount of
outstanding Notes necessary for waiver of compliance with certain provisions of
the Indenture or for waiver of certain defaults, (g) modify any provisions of
the Indenture relating to the modification and amendment of the Indenture or the
waiver of past defaults or covenants, except as otherwise specified, (h) change
the ranking of the Notes or the Subsidiary Guarantees in a manner
 
                                       44
<PAGE>   46
 
adverse to the Holders or expressly subordinate in right of payment the Notes or
the Subsidiary Guarantees to any other Indebtedness or (i) amend, change or
modify the obligation of the Company to make and consummate a Change of Control
Offer in the event of a Change of Control or make and consummate a Net Proceeds
Offer with respect to any Asset Sale or modify any of the provisions or
definitions with respect thereto.
 
     The Holders of not less than a majority in aggregate principal amount of
the outstanding Notes may, on behalf of the Holders of all Notes, waive any past
default under the Indenture, except a default in the payment of principal of,
premium, if any, or interest on the Notes, or in respect of a covenant or
provision which under the Indenture cannot be modified or amended without the
consent of the Holder of each Note outstanding.
 
THE TRUSTEE
 
     State Street Bank and Trust Company serves as trustee under the Indenture.
 
     The Indenture (including provisions of the Trust Indenture Act incorporated
by reference therein) contains limitations on the rights of the Trustee
thereunder, should it become a creditor of the Company, to obtain payment of
claims in certain cases or to realize on certain property received by it in
respect of any such claims, as security or otherwise. The Indenture permits the
Trustee to engage in other transactions; provided, however, if it acquires any
conflicting interest (as defined in the Trust Indenture Act) it must eliminate
such conflict or resign.
 
GOVERNING LAW
 
     The Indenture, the Notes and the Subsidiary Guarantees are governed by the
laws of the State of New York.
 
CERTAIN DEFINITIONS
 
     "Acquired Indebtedness" means Indebtedness of a Person (a) existing at the
time such Person becomes a Restricted Subsidiary or (b) assumed in connection
with acquisitions of properties or assets from such Person (other than any
Indebtedness incurred in connection with, or in contemplation of, such Person
becoming a Restricted Subsidiary or such acquisition). Acquired Indebtedness
shall be deemed to be incurred on the date the acquired Person becomes a
Restricted Subsidiary or the date of the related acquisition of properties or
assets from such Person.
 
     "Adjusted Net Assets" of a Subsidiary Guarantor at any date shall mean the
amount by which the fair value of the properties and assets of such Subsidiary
Guarantor exceeds the total amount of liabilities, including, without
limitation, contingent liabilities (after giving effect to all other fixed and
contingent liabilities incurred or assumed on such date), but excluding
liabilities under its Subsidiary Guarantee, of such Subsidiary Guarantor at such
date.
 
     "Affiliate" means, with respect to any specified Person, any other Person
directly or indirectly controlling or controlled by or under direct or indirect
common control with such specified Person. For the purposes of this definition,
"control," when used with respect to any Person, means the power to direct the
management and policies of such Person, directly or indirectly, whether through
the ownership of voting securities, by contract or otherwise; and the terms
"controlling" and "controlled" have meanings correlative to the foregoing. For
purposes of this definition, beneficial ownership of 10% or more of the voting
common equity (on a fully diluted basis) or options or warrants to purchase such
equity (but only if exercisable at the date of determination or within 60 days
thereof) of a Person shall be deemed to constitute control of such Person.
 
     "Asset Sale" means any sale, issuance, conveyance, transfer, lease or other
disposition to any Person other than the Company or any of its Restricted
Subsidiaries (including, without limitation, by means of a Sale/Leaseback
Transaction or a merger or consolidation) (collectively, for purposes of this
definition, a "transfer"), directly or indirectly, in one or a series of related
transactions, of (a) any Capital Stock of any Restricted Subsidiary held by the
Company or any other Restricted Subsidiary, (b) all or substantially all of the
properties and assets of any division or line of business of the Company or any
of its Restricted
 
                                       45
<PAGE>   47
 
Subsidiaries or (c) any other properties or assets of the Company or any of its
Restricted Subsidiaries other than transfers of cash, Cash Equivalents, accounts
receivable, hydrocarbons or other properties or assets in the ordinary course of
business or transfers in accordance with the proviso to clause (vi) of the
definition of Permitted Investments. For the purposes of this definition, the
term "Asset Sale" also shall not include any of the following: (i) any transfer
of properties or assets (including Capital Stock) that is governed by, and made
in accordance with, the provisions described under "-- Merger, Consolidation and
Sale of Assets"; (ii) any transfer of properties or assets to an Unrestricted
Subsidiary, if permitted under the "Limitation on Restricted Payments" covenant;
(iii) sales of damaged, worn-out or obsolete equipment or assets that, in the
Company's reasonable judgment, are either (x) no longer used or (y) no longer
useful in the business of the Company or its Restricted Subsidiaries; (iv) any
charter (bareboat or otherwise) or other lease of any property entered into in
the ordinary course of business and with respect to which the Company or any
Restricted Subsidiary is the lessor, except any such charter or lease that
provides for the acquisition of such property by the lessee during or at the end
of the term thereof for an amount that is less than the fair market value
thereof at the time the right to acquire such property is granted; (v) any trade
or exchange by the Company or any Restricted Subsidiary of one or more offshore
drilling rigs for one or more other offshore drilling rigs owned or held by
another Person, provided that (x) the fair value of the offshore drilling rig or
rigs traded or exchanged by the Company or such Restricted Subsidiary (including
any cash or Cash Equivalents to be delivered by the Company or such Restricted
Subsidiary) is reasonably equivalent to the fair value of the offshore drilling
rig or rigs (together with any cash or Cash Equivalents) to be received by the
Company or such Restricted Subsidiary as determined by written appraisal by a
nationally recognized investment banking firm or appraisal firm, in either case
specializing or having a specialty in offshore drilling rigs, and (y) such
exchange is approved by a majority of the Disinterested Directors of the
Company; (vi) any transfer by the Company or any Restricted Subsidiary to its
customers of drill pipe and associated drilling equipment utilized in connection
with a drilling contract for the employment of a drilling rig in the ordinary
course of business and consistent with past practice; and (vii) any transfers
that, but for this clause (vii), would be Asset Sales, if (A) the Company elects
to designate such transfers as not constituting Asset Sales and (B) after giving
effect to such transfers, the aggregate fair market value of the properties or
assets transferred in such transaction or any such series of related
transactions so designated by the Company does not exceed $500,000.
 
     "Attributable Indebtedness" means, with respect to any particular lease
under which any Person is at the time liable and at any date as of which the
amount thereof is to be determined, the present value of the total net amount of
rent required to be paid by such Person under the lease during the primary term
thereof, without giving effect to any renewals at the option of the lessee,
discounted from the respective due dates thereof to such date of determination
at a rate per annum equal to the discount rate which would be applicable to a
Capitalized Lease Obligation with a like term in accordance with GAAP. As used
in the preceding sentence, the "net amount of rent" under any such lease for any
such period shall mean the sum of rental and other payments required to be paid
with respect to such period by the lessee thereunder, excluding any amounts
required to be paid by such lessee on account of maintenance and repairs,
insurance, taxes, assessments, water rates or similar charges. In the case of
any lease which is terminable by the lessee upon payment of a penalty, such net
amount of rent shall also include the amount of such penalty, but no rent shall
be considered as required to be paid under such lease subsequent to the first
date upon which it may be so terminated.
 
     "Average Life" means, with respect to any Indebtedness, as at any date of
determination, the quotient obtained by dividing (a) the sum of the products of
(i) the number of years (and any portion thereof) from the date of determination
to the date or dates of each successive scheduled principal payment (including,
without limitation, any sinking fund or mandatory redemption payment
requirements) of such Indebtedness multiplied by (ii) the amount of each such
principal payment by (b) the sum of all such principal payments.
 
     "Capital Stock" means, with respect to any Person, any and all shares,
interests, participations, rights or other equivalents in the equity interests
(however designated) in such Person, and any rights (other than debt securities
convertible into an equity interest), warrants or options exercisable for,
exchangeable for or convertible into such an equity interest in such Person.
 
                                       46
<PAGE>   48
 
     "Capitalized Lease Obligation" means any obligation to pay rent or other
amounts under a lease of (or other agreement conveying the right to use) any
property (whether real, personal or mixed) that is required to be classified and
accounted for as a capital lease obligation under GAAP and, for the purpose of
the Indenture, the amount of such obligation at any date shall be the
capitalized amount thereof at such date, determined in accordance with GAAP.
 
     "Cash Equivalents" means (i) any evidence of Indebtedness with a maturity
of 180 days or less issued or directly and fully guaranteed or insured by the
United States of America or any agency or instrumentality thereof (provided that
the full faith and credit of the United States of America is pledged in support
thereof); (ii) demand and time deposits and certificates of deposit or
acceptances with a maturity of 180 days or less of any financial institution
that is a member of the Federal Reserve System having combined capital and
surplus and undivided profits of not less than $500 million; (iii) commercial
paper with a maturity of 180 days or less issued by a corporation that is not an
Affiliate of the Company and is organized under the laws of any state of the
United States or the District of Columbia and rated at least A-1 by S&P or at
least P-1 by Moody's; (iv) repurchase obligations with a term of not more than
seven days for underlying securities of the types described in clause (i) above
entered into with any commercial bank meeting the specifications of clause (ii)
above; (v) overnight bank deposits and bankers' acceptances at any commercial
bank meeting the qualifications specified in clause (ii) above; (vi) deposits
available for withdrawal on demand with any commercial bank not meeting the
qualifications specified in clause (ii) above, provided all such deposits do not
exceed $5 million in the aggregate at any one time; (vii) demand and time
deposits and certificates of deposit with any commercial bank organized in the
United States not meeting the qualifications specified in clause (ii) above,
provided that such deposits and certificates support bond, letter of credit and
other similar types of obligations incurred in the ordinary course of business;
and (viii) investments in money market or other mutual funds substantially all
of whose assets comprise securities of the types described in clauses (i)
through (v) above.
 
     "Change of Control" means the occurrence of any event or series of events
by which: (a) any "person" or "group" (as such terms are used in Sections 13(d)
and 14(d) of the Exchange Act) is or becomes the beneficial owner (as defined in
Rule 13d-3 under the Exchange Act), directly or indirectly, of more than 50% of
the total Voting Stock of the Company; (b) the Company consolidates with or
merges into another Person or any Person consolidates with, or merges into, the
Company, in any such event pursuant to a transaction in which the outstanding
Voting Stock of the Company is changed into or exchanged for cash, securities or
other property, other than any such transaction where (i) the outstanding Voting
Stock of the Company is changed into or exchanged for Voting Stock of the
surviving or resulting Person that is Qualified Capital Stock and (ii) the
holders of the Voting Stock of the Company immediately prior to such transaction
own, directly or indirectly, not less than a majority of the Voting Stock of the
surviving or resulting Person immediately after such transaction; (c) the
Company, either individually or in conjunction with one or more Restricted
Subsidiaries, sells, assigns, conveys, transfers, leases or otherwise disposes
of, or the Restricted Subsidiaries sell, assign, convey, transfer, lease or
otherwise dispose of, all or substantially all of the properties and assets of
the Company and its Restricted Subsidiaries, taken as a whole (either in one
transaction or a series of related transactions), including Capital Stock of the
Restricted Subsidiaries, to any Person (other than the Company or a Wholly Owned
Restricted Subsidiary); (d) during any consecutive two-year period, individuals
who at the beginning of such period constituted the Board of Directors of the
Company (together with any new directors whose election by such Board of
Directors or whose nomination for election by the stockholders of the Company
was approved by a vote of two-thirds of the directors then still in office who
were either directors at the beginning of such period or whose election or
nomination for election was previously so approved) cease for any reason to
constitute a majority of the Board of Directors of the Company then in office;
or (e) the liquidation or dissolution of the Company.
 
     "Common Stock" of any Person means Capital Stock of such Person that does
not rank prior, as to the payment of dividends or as to the distribution of
assets upon any voluntary or involuntary liquidation, dissolution or winding-up
of such Person, to shares of Capital Stock of any other class of such Person.
 
     "Consolidated EBITDA Coverage Ratio" means, for any period, the ratio on a
pro forma basis of (a) the sum of Consolidated Net Income, Consolidated Interest
Expense, Consolidated Income Tax Expense and
 
                                       47
<PAGE>   49
 
Consolidated Non-cash Charges deducted in computing Consolidated Net Income, in
each case, for such period, of the Company and its Restricted Subsidiaries on a
consolidated basis, all determined in accordance with GAAP, to (b) the sum of
such Consolidated Interest Expense for such period; provided, however, that (i)
the Consolidated EBITDA Coverage Ratio shall be calculated on a pro forma basis
assuming that (A) the Indebtedness to be incurred (and all other Indebtedness
incurred after the first day of such period of four full fiscal quarters
referred to in the covenant described in paragraph (a) under "-- Certain
Covenants -- Limitation on Indebtedness and Disqualified Capital Stock" through
and including the date of determination), and (if applicable) the application of
the net proceeds therefrom (and from any other such Indebtedness), including to
refinance other Indebtedness, had been incurred on the first day of such four-
quarter period and, in the case of Acquired Indebtedness, on the assumption that
the related transaction (whether by means of purchase, merger or otherwise) also
had occurred on such date with the appropriate adjustments with respect to such
acquisition being included in such pro forma calculation and (B) any acquisition
or disposition by the Company or any Restricted Subsidiary of any properties or
assets outside the ordinary course of business, or any repayment of any
principal amount of any Indebtedness of the Company or any Restricted Subsidiary
prior to the Stated Maturity thereof, in either case since the first day of such
period of four full fiscal quarters through and including the date of
determination, had been consummated on such first day of such four-quarter
period, (ii) in making such computation, the Consolidated Interest Expense
attributable to interest on any Indebtedness required to be computed on a pro
forma basis in accordance with the covenant described in paragraph (a) under
"-- Certain Covenants -- Limitation on Indebtedness and Disqualified Capital
Stock" and (A) bearing a floating interest rate shall be computed as if the rate
in effect on the date of computation had been the applicable rate for the entire
period and (B) which was not outstanding during the period for which the
computation is being made but which bears, at the option of the Company, a fixed
or floating rate of interest, shall be computed by applying, at the option of
the Company, either the fixed or floating rate, (iii) in making such
computation, the Consolidated Interest Expense attributable to interest on any
Indebtedness under a revolving credit facility required to be computed on a pro
forma basis in accordance with the covenant described in paragraph (a) under
"-- Certain Covenants -- Limitation on Indebtedness and Disqualified Capital
Stock" shall be computed based upon the average daily balance of such
Indebtedness during the applicable period, provided that such average daily
balance shall be reduced by the amount of any repayment of Indebtedness under a
revolving credit facility during the applicable period, which repayment
permanently reduced the commitments or amounts available to be reborrowed under
such facility, (iv) notwithstanding clauses (ii) and (iii) of this proviso,
interest on Indebtedness determined on a fluctuating basis, to the extent such
interest is covered by agreements relating to Interest Rate Protection
Obligations, shall be deemed to have accrued at the rate per annum resulting
after giving effect to the operation of such agreements, and (v) if after the
first day of the period referred to in clause (a) of this definition the Company
has permanently retired any Indebtedness out of the Net Cash Proceeds of the
issuance and sale of shares of Qualified Capital Stock of the Company within 30
days of such issuance and sale, Consolidated Interest Expense shall be
calculated on a pro forma basis as if such Indebtedness had been retired on the
first day of such period.
 
     "Consolidated Income Tax Expense" means, for any period, the provision for
federal, state, local and foreign income taxes (including state franchise taxes
accounted for as income taxes in accordance with GAAP) of the Company and its
Restricted Subsidiaries for such period as determined on a consolidated basis in
accordance with GAAP.
 
     "Consolidated Interest Expense" means, for any period, without duplication,
(i) the sum of (a) the interest expense of the Company and its Restricted
Subsidiaries for such period as determined on a consolidated basis in accordance
with GAAP, including, without limitation, (A) any amortization of debt discount,
(B) the net cost under Interest Rate Protection Obligations (including any
amortization of discounts), (C) the interest portion of any deferred payment
obligation constituting Indebtedness, (D) all commissions, discounts and other
fees and charges owed with respect to letters of credit and bankers' acceptance
financing and (E) all accrued interest, in each case to the extent attributable
to such period, (b) to the extent any Indebtedness of any Person (other than the
Company or a Restricted Subsidiary) is guaranteed by the Company or any
Restricted Subsidiary, the aggregate amount of interest paid (to the extent not
accrued in a prior period) or accrued by such other Person during such period
attributable to any such
 
                                       48
<PAGE>   50
 
Indebtedness, in each case to the extent attributable to that period, (c) the
aggregate amount of the interest component of Capitalized Lease Obligations paid
(to the extent not accrued in a prior period), accrued or scheduled to be paid
or accrued by the Company and its Restricted Subsidiaries during such period and
(d) the aggregate amount of dividends paid (to the extent not accrued in a prior
period) or accrued on Preferred Stock or Disqualified Capital Stock of the
Company and its Restricted Subsidiaries, to the extent such Preferred Stock or
Disqualified Capital Stock is owned by Persons other than the Company or any
Restricted Subsidiary, less (ii), to the extent included in clause (i) above,
amortization of capitalized debt issuance costs of the Company and its
Restricted Subsidiaries during such period.
 
     "Consolidated Net Income" means, for any period, the consolidated net
income (or loss) of the Company and its Restricted Subsidiaries for such period
as determined in accordance with GAAP, adjusted by excluding (a) net after-tax
extraordinary gains or losses (less all fees and expenses relating thereto), (b)
net after-tax gains or losses (less all fees and expenses relating thereto)
attributable to Asset Sales, (c) the net income (or net loss) of any Person
(other than the Company or any of its Restricted Subsidiaries), in which the
Company or any of its Restricted Subsidiaries has an ownership interest, except
to the extent of the amount of dividends or other distributions actually paid to
the Company or any of its Restricted Subsidiaries in cash by such other Person
during such period (regardless of whether such cash dividends or distributions
are attributable to net income (or net loss) of such Person during such period
or during any prior period), (d) net income (or net loss) of any Person combined
with the Company or any of its Restricted Subsidiaries on a "pooling of
interests" basis attributable to any period prior to the date of combination,
(e) the net income of any Restricted Subsidiary to the extent that the
declaration or payment of dividends or similar distributions by that Restricted
Subsidiary of its net income is not at the date of determination permitted,
directly or indirectly, by operation of the terms of its charter or any
agreement, instrument, judgment, decree, order, statute, rule or governmental
regulation applicable to that Restricted Subsidiary or its stockholders, and (f)
income resulting from transfers of assets received by the Company or any
Restricted Subsidiary from an Unrestricted Subsidiary.
 
     "Consolidated Net Worth" means, at any date, the consolidated stockholders'
equity of the Company less the amount of such stockholders' equity attributable
to Disqualified Capital Stock or treasury stock of the Company and its
Restricted Subsidiaries, as determined in accordance with GAAP.
 
     "Consolidated Non-cash Charges" means, for any period, the aggregate
depreciation, depletion, amortization and other non-cash expenses of the Company
and its Restricted Subsidiaries reducing Consolidated Net Income for such
period, determined on a consolidated basis in accordance with GAAP (excluding
any such non-cash charge for which an accrual of or reserve for cash charges for
any future period is required).
 
     "Currency Hedge Obligations" means, at any time as to any Person, the
obligations of such Person at such time which were incurred in the ordinary
course of business pursuant to any foreign currency exchange agreement, option
or futures contract or other similar agreement or arrangement designed to
protect against or manage such Person's or any of its Subsidiaries' exposure to
fluctuations in foreign currency exchange rates.
 
     "Default" means any event, act or condition that is, or after notice or
passage of time or both would become, an Event of Default.
 
     "Disinterested Director" means, with respect to any transaction or series
of transactions in respect of which the Board of Directors of the Company is
required to deliver a resolution of the Board of Directors under the Indenture,
a member of the Board of Directors of the Company who does not have any material
direct or indirect financial interest (other than an interest arising solely
from the beneficial ownership of Capital Stock of the Company) in or with
respect to such transaction or series of transactions.
 
     "Disqualified Capital Stock" means any Capital Stock that, either by its
terms, by the terms of any security into which it is convertible or exchangeable
or by contract or otherwise, is, or upon the happening of an event or passage of
time would be, required to be redeemed or repurchased prior to the final Stated
Maturity of the Notes or is redeemable at the option of the holder thereof at
any time prior to such final Stated Maturity, or is convertible into or
exchangeable for debt securities at any time prior to such final Stated
Maturity. For purposes of the covenant described in paragraph (a) under
"-- Certain Covenants --
 
                                       49
<PAGE>   51
 
Limitation on Indebtedness and Disqualified Capital Stock", Disqualified Capital
Stock shall be valued at the greater of its voluntary or involuntary maximum
fixed redemption or repurchase price plus accrued and unpaid dividends. For such
purposes, the "maximum fixed redemption or repurchase price" of any Disqualified
Capital Stock which does not have a fixed redemption or repurchase price shall
be calculated in accordance with the terms of such Disqualified Capital Stock as
if such Disqualified Capital Stock were redeemed or repurchased on the date of
determination, and if such price is based upon, or measured by, the fair market
value of such Disqualified Capital Stock, such fair market value shall be
determined in good faith by the board of directors of the issuer of such
Disqualified Capital Stock; provided, however, that if such Disqualified Capital
Stock is not at the date of determination permitted or required to be redeemed
or repurchased, the "maximum fixed redemption or repurchase price" shall be the
book value of such Disqualified Capital Stock.
 
     "Event of Default" has the meaning set forth above under the caption
"Events of Default."
 
     "Event of Loss" means, with respect to any drilling rig, MOPU or related
property or asset of the Company or any Restricted Subsidiary, (i) any damage to
such drilling rig, MOPU or related property or asset which results in an
insurance settlement with respect thereto on the basis of a total loss or a
constructive or compromised total loss or (ii) the confiscation, condemnation or
requisition of title to such drilling rig, MOPU or related property or asset by
any government or any instrumentality or agency thereof. An Event of Loss shall
be deemed to occur as of the date of the insurance settlement, confiscation,
condemnation or requisition of title, as applicable.
 
     "GAAP" means generally accepted accounting principles, consistently
applied, that are set forth in the opinions and pronouncements of the Accounting
Principles Board of the American Institute of Certified Public Accountants and
statements and pronouncements of the Financial Accounting Standards Board or in
such other statements by such other entity as may be approved by a significant
segment of the accounting profession of the United States of America, which are
applicable as of the date of the Series A/B Indenture.
 
     The term "guarantee" means, as applied to any obligation, (i) a guarantee
(other than by endorsement of negotiable instruments for collection in the
ordinary course of business), direct or indirect, in any manner, of any part or
all of such obligation and (ii) an agreement, direct or indirect, contingent or
otherwise, the practical effect of which is to assure in any way the payment or
performance (or payment of damages in the event of non-performance) of all or
any part of such obligation, including, without limiting the foregoing, the
payment of amounts drawn down under letters of credit. When used as a verb,
"guarantee" has a corresponding meaning.
 
     "Holder" means a Person in whose name a Note is registered in the Note
Register.
 
     "Indebtedness" means, with respect to any Person, without duplication, (a)
all liabilities of such Person, contingent or otherwise, for borrowed money or
for the deferred purchase price of property or services (excluding any trade
accounts payable and other accrued current liabilities incurred in the ordinary
course of business) and all liabilities of such Person incurred in connection
with any letters of credit, bankers' acceptances or other similar credit
transactions or any agreement to purchase, redeem, exchange, convert or
otherwise acquire for value any Capital Stock of such Person, or any warrants,
rights or options to acquire such Capital Stock, outstanding on the date of the
Series A/B Indenture or thereafter, if, and to the extent, any of the foregoing
would appear as a liability upon a balance sheet of such Person prepared in
accordance with GAAP, (b) all obligations of such Person evidenced by bonds,
notes, debentures or other similar instruments, if, and to the extent, any of
the foregoing would appear as a liability upon a balance sheet of such Person
prepared in accordance with GAAP, (c) all Indebtedness of such Person created or
arising under any conditional sale or other title retention agreement with
respect to property acquired by such Person (even if the rights and remedies of
the seller or lender under such agreement in the event of default are limited to
repossession or sale of such property), but excluding trade accounts payable
arising in the ordinary course of business, (d) the Attributable Indebtedness
respecting all Capitalized Lease Obligations of such Person (e) all Indebtedness
referred to in the preceding clauses of other Persons and all dividends of other
Persons, the payment of which is secured by (or for which the holder of such
Indebtedness has an existing right, contingent or otherwise, to be secured by)
any Lien upon property (including, without limitation, accounts and contract
rights) owned by such Person, even though such Person has not assumed or become
liable for the
 
                                       50
<PAGE>   52
 
payment of such Indebtedness (the amount of such obligation being deemed to be
the lesser of the value of such property or the amount of the obligation so
secured), (f) all guarantees by such Person of Indebtedness referred to in this
definition and (g) all obligations of such Person under or in respect of
Currency Hedge Obligations and Interest Rate Protection Obligations.
 
     "Interest Rate Protection Obligations" means the obligations of any Person
pursuant to any arrangement with any other Person whereby, directly or
indirectly, such Person is entitled to receive from time to time periodic
payments calculated by applying either a floating or a fixed rate of interest on
a stated notional amount in exchange for periodic payments made by such Person
calculated by applying a fixed or a floating rate of interest on the same
notional amount and shall include, without limitation, interest rate swaps,
caps, floors, collars and similar agreements or arrangements designed to protect
against or manage such Person's or any of its Subsidiaries exposure to
fluctuations in interest rates.
 
     "Investment" means, with respect to any Person, any direct or indirect
advance, loan, guarantee of Indebtedness or other extension of credit or capital
contribution to (by means of any transfer of cash or other property or assets to
others or any payment for property, assets or services for the account or use of
others), or any purchase or acquisition by such Person of any Capital Stock,
bonds, notes, debentures or other securities (including derivatives) or
evidences of Indebtedness issued by, any other Person. In addition, the fair
market value of the net assets of any Restricted Subsidiary at the time that
such Restricted Subsidiary is designated an Unrestricted Subsidiary shall be
deemed to be an "Investment" made by the Company in such Unrestricted Subsidiary
at such time. "Investments" shall exclude (a) extensions of trade credit or
other advances to customers on commercially reasonable terms in accordance with
normal trade practices or otherwise in the ordinary course of business, (b)
Interest Rate Protection Obligations and Currency Hedge Obligations, but only to
the extent that the same constitute Permitted Indebtedness and (c) endorsements
of negotiable instruments and documents in the ordinary course of business.
 
     "Lien" means any mortgage, charge, pledge, lien (statutory or other),
security interest, hypothecation, assignment for security, claim or similar type
of encumbrance (including, without limitation, any agreement to give or grant
any lease, conditional sale or other title retention agreement having
substantially the same economic effect as any of the foregoing) upon or with
respect to any property of any kind. A Person shall be deemed to own subject to
a Lien any property which such Person has acquired or holds subject to the
interest of a vendor or lessor under any conditional sale agreement, capital
lease or other title retention agreement.
 
     "Maturity" means, with respect to any Note, the date on which any principal
of such Note becomes due and payable as therein or in the Indenture provided,
whether at the Stated Maturity with respect to such principal or by declaration
of acceleration, call for redemption or purchase or otherwise.
 
     "Moody's" means Moody's Investors Service, Inc. and its successors.
 
     "Net Available Proceeds" means, with respect to any Asset Sale, the
proceeds thereof in the form of cash or Cash Equivalents including payments in
respect of deferred payment obligations when received in the form of cash or
Cash Equivalents (except to the extent that such obligations are financed or
sold with recourse to the Company or any Restricted Subsidiary), net of (i)
brokerage commissions and other fees and expenses (including fees and expenses
of legal counsel, accountants and investment banks) related to such Asset Sale,
(ii) provisions for all taxes payable as a result of such Asset Sale, (iii)
amounts required to be paid to any Person (other than the Company or any
Restricted Subsidiary) owning a beneficial interest in the properties or assets
subject to the Asset Sale or having a Lien thereon and (iv) appropriate amounts
to be provided by the Company or any Restricted Subsidiary, as the case may be,
as a reserve required in accordance with GAAP against any liabilities associated
with such Asset Sale and retained by the Company or any Restricted Subsidiary,
as the case may be, after such Asset Sale, including, without limitation,
pension and other post-employment benefit liabilities, liabilities related to
environmental matters and liabilities under any indemnification obligations
associated with such Asset Sale, all as reflected in an Officers' Certificate
delivered to the Trustee; provided, however, that any amounts remaining after
adjustments, revaluations or liquidations of such reserves shall constitute Net
Available Proceeds. "Net Available Proceeds" means, with respect to any Event of
Loss, the proceeds to the Company or any Restricted Subsidiary as a result
thereof in the form of cash or Cash Equivalents, including insurance proceeds
paid to the Company or any Restricted Subsidiary, and all
 
                                       51
<PAGE>   53
 
payments received by the Company or any Restricted Subsidiary from any
government or any instrumentality or agency thereof by way of compensation for
the requisition of title to property, net of all fees and expenses incurred by
the Company or any Restricted Subsidiary related to the collection or receipt of
such proceeds, all as reflected in an Officers' Certificate delivered to the
Trustee.
 
     "Net Cash Proceeds," with respect to any issuance or sale of Qualified
Capital Stock or other securities, means the cash proceeds of such issuance or
sale net of attorneys' fees, accountants' fees, underwriters' or placement
agents' fees, discounts or commissions and brokerage, consultant and other fees
and expenses actually incurred in connection with such issuance or sale and net
of taxes paid or payable as a result thereof.
 
     "Non-Recourse Indebtedness" means Indebtedness or that portion of
Indebtedness of the Company or any Restricted Subsidiary incurred in connection
with the acquisition by the Company or such Restricted Subsidiary of any
property or assets and as to which (a) the holders of such Indebtedness agree
that they will look solely to the property or assets so acquired and securing
such Indebtedness for payment on or in respect of such Indebtedness, and neither
the Company nor any Subsidiary (other than an Unrestricted Subsidiary) (i)
provides credit support, including any undertaking, agreement or instrument
which would constitute Indebtedness or (ii) is directly or indirectly liable for
such Indebtedness, and (b) no default with respect to such Indebtedness would
permit (after notice or passage of time or both), according to the terms
thereof, any holder of any Indebtedness of the Company or a Restricted
Subsidiary to declare a default on such Indebtedness or cause the payment
thereof to be accelerated or payable prior to its Stated Maturity.
 
     "Note Register" means the register maintained by or for the Company in
which the Company shall provide for the registration of the Notes and the
transfer of the Notes.
 
     "Permitted Indebtedness" means any of the following:
 
          (i) Indebtedness (and any guarantee thereof) under one or more credit
     facilities with banks and other financial institutions in an aggregate
     principal amount at any one time outstanding not to exceed $35 million,
     less any amounts derived from Asset Sales and applied to the permanent
     reduction of the Indebtedness under any such credit facilities as
     contemplated by the "Limitation on Asset Sales" covenant (the "Maximum Bank
     Credit Amount"), and any renewals, amendments, extensions, supplements,
     modifications, deferrals, refinancing or replacements (each, for purposes
     of this clause (i), a "refinancing") thereof, including any successive
     refinancing thereof, so long as the aggregate principal amount of any such
     new Indebtedness, together with the aggregate principal amount of all other
     Indebtedness outstanding pursuant to this clause (i), shall not at any one
     time exceed the Maximum Bank Credit Amount;
 
          (ii) Indebtedness under the Notes and any Exchange Notes issued in
     exchange for Notes of an equal principal amount;
 
          (iii) Indebtedness outstanding or in effect on the date of the
     Indenture (and not repaid or defeased with the proceeds of the offering of
     the Notes), including Indebtedness of the WINDJV being guaranteed by the
     Company and Indebtedness outstanding under the Company's Series B Notes as
     defined in the Series A/B Indenture.
 
          (iv) Indebtedness under Interest Rate Protection Obligations, provided
     that (1) such Interest Rate Protection Obligations are related to payment
     obligations on Permitted Indebtedness or Indebtedness otherwise permitted
     by paragraph (a) of the "Limitation on Indebtedness and Disqualified
     Capital Stock" covenant, and (2) the notional principal amount of such
     Interest Rate Protection Obligations does not exceed the principal amount
     of such Indebtedness to which such Interest Rate Protection Obligations
     relate;
 
          (v) Indebtedness under Currency Hedge Obligations, provided that (1)
     such Currency Hedge Obligations are related to payment obligations on
     Permitted Indebtedness or Indebtedness otherwise permitted by paragraph (a)
     of the "Limitation on Indebtedness and Disqualified Capital Stock" covenant
     or to the foreign currency cash flows reasonably expected to be generated
     by the Company and its Restricted Subsidiaries, and (2) the notional
     principal amount of such Currency Hedge Obligations does
 
                                       52
<PAGE>   54
 
     not exceed the principal amount of such Indebtedness and the amount of such
     foreign currency cash flows to which such Currency Hedge Obligations
     relate;
 
          (vi) the Subsidiary Guarantees of the Company's outstanding Series B
     Notes and the Notes (and any assumption of the obligations guaranteed
     thereby);
 
          (vii) Indebtedness of the Company to a Wholly Owned Restricted
     Subsidiary and Indebtedness of any Restricted Subsidiary to the Company or
     a Wholly Owned Restricted Subsidiary; provided, however, that upon any
     subsequent issuance or transfer of any Capital Stock or any other event
     which results in any such Wholly Owned Restricted Subsidiary ceasing to be
     a Wholly Owned Restricted Subsidiary or any other subsequent transfer of
     any such Indebtedness (except to the Company or a Wholly Owned Restricted
     Subsidiary), such Indebtedness shall be deemed, in each case, to be
     incurred and shall be treated as an incurrence for purposes of paragraph
     (a) of the "Limitation on Indebtedness and Disqualified Capital Stock"
     covenant at the time the Wholly Owned Restricted Subsidiary in question
     ceased to be a Wholly Owned Restricted Subsidiary or the time such
     subsequent transfer occurred;
 
          (viii) Indebtedness in respect of bid, performance or surety bonds
     issued for the account of the Company or any Restricted Subsidiary in the
     ordinary course of business, including guaranties or obligations of the
     Company or any Restricted Subsidiary with respect to letters of credit
     supporting such bid, performance or surety obligations (in each case other
     than for an obligation for money borrowed);
 
          (ix) Non-Recourse Indebtedness;
 
          (x) any renewals, substitutions, refinancing or replacements (each,
     for purposes of this clause (x), a "refinancing") by the Company or a
     Restricted Subsidiary of any Indebtedness incurred pursuant to clause (ii)
     or (iii) of this definition, including any successive refinancing by the
     Company or such Restricted Subsidiary, so long as (A) any such new
     Indebtedness shall be in a principal amount that does not exceed the
     principal amount (or, if such Indebtedness being refinanced provides for an
     amount less than the principal amount thereof to be due and payable upon a
     declaration of acceleration thereof, such lesser amount as of the date of
     determination) so refinanced plus the amount of any premium required to be
     paid in connection with such refinancing pursuant to the terms of the
     Indebtedness refinanced or the amount of any premium reasonably determined
     by the Company or such Restricted Subsidiary as necessary to accomplish
     such refinancing, plus the amount of expenses of the Company or such
     Restricted Subsidiary incurred in connection with such refinancing, (B) in
     the case of any refinancing of Indebtedness (including the Notes) that is
     pari passu with or subordinated in right of payment to either the Notes or
     the Subsidiary Guarantees, then such new Indebtedness is either pari passu
     with or subordinated in right of payment to the Notes or the Subsidiary
     Guarantees, as the case may be, at least to the same extent as the
     Indebtedness being refinanced and (C) such new Indebtedness has an Average
     Life equal to or longer than the Average Life of the Indebtedness being
     refinanced and a final Stated Maturity that is at least 91 days later than
     the final Stated Maturity of the Indebtedness being refinanced; and
 
          (xi) any additional Indebtedness in an aggregate principal amount not
     in excess of $75 million at any one time outstanding and any guarantee
     thereof.
 
     "Permitted Investments" means any of the following: (i) Investments in Cash
Equivalents; (ii) Investments in the Company or any of its Wholly Owned
Restricted Subsidiaries; (iii) Investments by the Company or any of its
Restricted Subsidiaries in another Person, if as a result of such Investment (A)
such other Person becomes a Wholly Owned Restricted Subsidiary or (B) such other
Person is merged or consolidated with or into, or transfers or conveys all or
substantially all of its properties and assets to, the Company or a Wholly Owned
Restricted Subsidiary; (iv) Investments permitted under the "Limitation on Asset
Sales" covenant or the "Limitation on Transactions with Affiliates" covenant;
(v) Investments made in the ordinary course of business in prepaid expenses,
lease, utility, workers' compensation, performance and other similar deposits;
(vi) Investments in stock, obligations or securities received in settlement of
debts owing to the Company or any Restricted Subsidiary as a result of
bankruptcy or insolvency proceedings or upon the foreclosure, perfection or
enforcement of any Lien in favor of the Company or any Restricted Subsidiary, in
 
                                       53
<PAGE>   55
 
each case as to debt owing to the Company or any Restricted Subsidiary that
arose in the ordinary course of business of the Company or any such Restricted
Subsidiary, provided that any stocks, obligations or securities received in
settlement of debts that arose in the ordinary course of business (and received
other than as a result of bankruptcy or insolvency proceedings or upon
foreclosure, perfection or enforcement of any Lien) that are, within 30 days of
receipt, converted into cash or Cash Equivalents shall be treated as having been
cash or Cash Equivalents at the time received; (vii) other Investments in joint
ventures, corporations, limited liability companies or partnerships formed with
or organized by third Persons, which joint ventures, corporations, limited
liability companies or partnerships, engage in a business substantially similar,
or related, to the business conducted by the Company and its Restricted
Subsidiaries, provided such Investments do not, in the aggregate, exceed the sum
of (1) $15 million and (2) the aggregate amount of principal repayments,
interest on Indebtedness, dividends, distributions or other return of capital
received by the Company or a Restricted Subsidiary from any Person (other than
the Company or any Restricted Subsidiary) in which the Company or any of its
Restricted Subsidiaries has an ownership interest (including any return of
capital resulting from redesignation of an Unrestricted Subsidiary as a
Restricted Subsidiary).
 
          "Permitted Liens" means the following types of Liens:
 
          (a) Liens existing as of the date of the Series A/B Indenture;
 
          (b) Liens securing the Notes or the Subsidiary Guarantees;
 
          (c) Liens in favor of the Company;
 
          (d) Liens securing Indebtedness that constitutes Permitted
     Indebtedness pursuant to clause (i) of the definition of "Permitted
     Indebtedness";
 
          (e) Liens for taxes, assessments and governmental charges or claims
     either (i) not delinquent or (ii) contested in good faith by appropriate
     proceedings and as to which the Company or its Restricted Subsidiaries
     shall have set aside on its books such reserves as may be required pursuant
     to GAAP;
 
          (f) statutory Liens of landlords and Liens of carriers, warehousemen,
     mechanics, suppliers, materialmen, repairmen and other Liens imposed by law
     incurred in the ordinary course of business for sums not delinquent or
     being contested in good faith, if such reserve or other appropriate
     provision, if any, as shall be required by GAAP shall have been made in
     respect thereof;
 
          (g) Liens incurred or deposits made in the ordinary course of business
     in connection with workers' compensation, unemployment insurance and other
     types of social security, or to secure the payment or performance of
     tenders, statutory or regulatory obligations, surety and appeal bonds,
     bids, government contracts and leases, performance and return of money
     bonds and other similar obligations (exclusive of obligations for the
     payment of borrowed money);
 
          (h) judgment Liens not giving rise to an Event of Default so long as
     any appropriate legal proceedings which may have been duly initiated for
     the review of such judgment shall not have been finally terminated or the
     period within which such proceeding may be initiated shall not have
     expired;
 
          (i) any interest or title of a lessor under any Capitalized Lease
     Obligation or operating lease;
 
          (j) purchase money Liens; provided, however, that (i) the related
     purchase money Indebtedness shall not be secured by any property or assets
     of the Company or any Restricted Subsidiary other than the property or
     assets so acquired and any proceeds therefrom and (ii) the Lien securing
     such Indebtedness shall be created within 90 days of such acquisition;
 
          (k) Liens securing obligations under or in respect of either Currency
     Hedge Obligations or Interest Rate Protection Obligations;
 
          (l) Liens upon specific items of inventory or other goods of any
     Person securing such Person's obligations in respect of bankers acceptances
     issued or created for the account of such Person to facilitate the
     purchase, shipment or storage of such inventory or other goods;
 
                                       54
<PAGE>   56
 
          (m) Liens securing reimbursement obligations with respect to
     commercial letters of credit which encumber documents and other property or
     assets relating to such letters of credit and products and proceeds
     thereof;
 
          (n) Liens encumbering deposits made to secure obligations arising from
     statutory, regulatory, contractual or warranty requirements of the Company
     or any of its Restricted Subsidiaries, including rights of offset and
     set-off;
 
          (o) Liens on, or related to, properties or assets to secure all or
     part of the costs incurred in the ordinary course of business for the
     exploration, drilling, development or operation thereof; and
 
          (p) Liens securing Non-Recourse Indebtedness; provided, however, that
     the related Non-Recourse Indebtedness shall not be secured by any property
     or assets of the Company or any Restricted Subsidiary other than the
     property and assets acquired by the Company or any Restricted Subsidiary
     with the proceeds of such Non-Recourse Indebtedness.
 
     "Person" means any individual, corporation, limited liability company,
partnership, joint venture, association, joint stock company, trust,
unincorporated organization or government or any agency or political subdivision
thereof.
 
     "Preferred Stock" means, with respect to any Person, any and all shares,
interests, participations or other equivalents (however designated) of such
Person's preferred or preference stock, whether now outstanding or issued after
the date of the Series A/B Indenture, including, without limitation, all classes
and series of preferred or preference stock of such Person.
 
     "Public Equity Offering" means an offer and sale of Common Stock of the
Company pursuant to a registration statement that has been declared effective by
the Commission pursuant to the Securities Act (other than a registration
statement on Form S-8 or otherwise relating to equity securities issuable under
any employee benefit plan of the Company).
 
     "Qualified Capital Stock" of any Person means any and all Capital Stock of
such Person other than Disqualified Capital Stock.
 
     "Restricted Investment" means (without duplication) (i) the designation of
a Subsidiary as an Unrestricted Subsidiary in the manner described in the
definition of "Unrestricted Subsidiary" and (ii) any Investment other than a
Permitted Investment or an Investment in the WINDJV.
 
     "Restricted Subsidiary" means any Subsidiary of the Company, whether
existing on or after the date of the Series A/B Indenture, unless such
Subsidiary of the Company is an Unrestricted Subsidiary or is designated as an
Unrestricted Subsidiary pursuant to the terms of the Indenture.
 
     "S&P" means Standard and Poor's Ratings Services, a division of The
McGraw-Hill Companies, Inc., and its successors.
 
     "Sale/Leaseback Transaction" means any direct or indirect arrangement
pursuant to which properties or assets are sold or transferred by the Company or
a Restricted Subsidiary and are thereafter leased back from the purchaser or
transferee thereof by the Company or one of its Restricted Subsidiaries.
 
     "Series A/B Indenture" means the Indenture dated as of May 15, 1996, as
amended, among the Company, the "Subsidiary Guarantors" (as defined therein) and
State Street Bank and Trust Company (successor to Fleet National Bank), as
trustee, and providing for the issue of the Series A Notes and the Series B
Notes which were issued in exchange therefor in the aggregate principal amount
of $150 million.
 
     "Series A Notes" means the 10.25% Senior Notes due 2003, Series A issued by
the Company pursuant to the Series A/B Indenture.
 
     "Series B Notes" means the 10.25% Senior Notes Due 2003, Series B issued by
the Company pursuant to the Series A/B Indenture.
 
     "Stated Maturity" means, when used with respect to any Indebtedness or any
installment of interest thereon, the date specified in the instrument evidencing
or governing such Indebtedness as the fixed date on which the principal of such
Indebtedness or such installment of interest is due and payable.
 
                                       55
<PAGE>   57
 
     "Subordinated Indebtedness" means any Indebtedness of the Company or a
Subsidiary Guarantor which is expressly subordinated in right of payment to the
Notes or the Subsidiary Guarantees, as the case may be.
 
     "Subsidiary" means, with respect to any Person, (i) a corporation a
majority of whose Voting Stock is at the time, directly or indirectly, owned by
such Person, by one or more Subsidiaries of such Person or by such Person and
one or more Subsidiaries thereof or (ii) any other Person (other than a
corporation), including, without limitation, a joint venture, in which such
Person, one or more Subsidiaries thereof or such Person and one or more
Subsidiaries thereof, directly or indirectly, at the date of determination
thereof, have at least majority ownership interest entitled to vote in the
election of directors, managers or trustees thereof (or other Person performing
similar functions).
 
     "Subsidiary Guarantee" means any guarantee of the Notes by any Subsidiary
Guarantor in accordance with the provisions described under "-- Subsidiary
Guarantees of Notes."
 
     "Subsidiary Guarantor" means (i) Southwestern Offshore Corporation
(formerly known as Cliffs Drilling Asset Acquisition Company), (ii) Cliffs
Drilling Merger Company, (iii) Cliffs Drilling International, Inc., (iv) Cliffs
Oil and Gas Company, (v) DRL, Inc., (vi) Cliffs Drilling Trinidad Ltd., (vii)
the West Indies Drilling Joint Venture, (viii) each of the Company's other
Restricted Subsidiaries, if any, executing a supplemental indenture in which
such Subsidiary agrees to be bound by the terms of the Indenture and (ix) any
Person that becomes a successor guarantor of the Notes in compliance with the
provisions described under "-- Subsidiary Guarantees of Notes."
 
     "Unrestricted Subsidiary" means (i) any Subsidiary of the Company that at
the time of determination will be designated an Unrestricted Subsidiary by the
Board of Directors of the Company as provided below and (ii) any Subsidiary of
an Unrestricted Subsidiary. The Board of Directors of the Company may designate
any Subsidiary of the Company as an Unrestricted Subsidiary so long as (a)
neither the Company nor any Restricted Subsidiary is directly or indirectly
liable pursuant to the terms of any Indebtedness of such Subsidiary; (b) no
default with respect to any Indebtedness of such Subsidiary would permit (upon
notice, lapse of time or otherwise) any holder of any other Indebtedness of the
Company or any Restricted Subsidiary to declare a default on such other
Indebtedness or cause the payment thereof to be accelerated or payable prior to
its Stated Maturity; (c) such designation as an Unrestricted Subsidiary would be
permitted under the "Limitation on Restricted Payments" covenant; and (d) such
designation shall not result in the creation or imposition of any Lien on any of
the properties or assets of the Company or any Restricted Subsidiary (other than
any Permitted Lien or any Lien the creation or imposition of which shall have
been in compliance with the "Limitation on Liens" covenant); provided, however,
that with respect to clause (a), the Company or a Restricted Subsidiary may be
liable for Indebtedness of an Unrestricted Subsidiary if (x) such liability
constituted a Permitted Investment or a Restricted Payment permitted by the
"Limitation on Restricted Payments" covenant, in each case at the time of
incurrence, or (y) the liability would be a Permitted Investment at the time of
designation of such Subsidiary as an Unrestricted Subsidiary. Any such
designation by the Board of Directors of the Company shall be evidenced to the
Trustee by filing a Board Resolution with the Trustee giving effect to such
designation. The Board of Directors of the Company may designate any
Unrestricted Subsidiary as a Restricted Subsidiary if, immediately after giving
effect to such designation on a pro forma basis, (i) no Default or Event of
Default shall have occurred and be continuing, (ii) the Company could incur
$1.00 of additional Indebtedness (not including the incurrence of Permitted
Indebtedness) under the first paragraph of the "Limitation on Indebtedness and
Disqualified Capital Stock" covenant and (iii) if any of the properties and
assets of the Company or any of its Restricted Subsidiaries would upon such
designation become subject to any Lien (other than a Permitted Lien), the
creation or imposition of such Lien shall have been in compliance with the
"Limitation on Liens" covenant.
 
     "Voting Stock" means any class or classes of Capital Stock pursuant to
which the holders thereof have the general voting power under ordinary
circumstances to elect at least a majority of the board of directors, managers
or trustees of any Person (irrespective of whether or not, at the time, stock of
any other class or classes shall have, or might have, voting power by reason of
the happening of any contingency).
 
     "Wholly Owned Restricted Subsidiary" means any Restricted Subsidiary to the
extent (i) all of the Capital Stock or other ownership interests in such
Restricted Subsidiary, other than any directors' qualifying
 
                                       56
<PAGE>   58
 
shares mandated by applicable law, is owned directly or indirectly by the
Company or (ii) such Restricted Subsidiary is organized in a foreign
jurisdiction and is required by the applicable laws and regulations of such
foreign jurisdiction to be partially owned by the government of such foreign
jurisdiction or individual or corporate citizens of such foreign jurisdiction in
order for such Restricted Subsidiary to transact business in such foreign
jurisdiction, provided that the Company, directly or indirectly, owns the
remaining Capital Stock or ownership interest in such Restricted Subsidiary and,
by contract or otherwise, controls the management and business of such
Restricted Subsidiary and derives the economic benefits of ownership of such
Restricted Subsidiary to substantially the same extent as if such Restricted
Subsidiary were a wholly owned Subsidiary.
 
BOOK ENTRY; DELIVERY AND FORM
 
     The Exchange Notes initially will be represented by a single, permanent
global certificate in definitive, fully registered form (the "Global Note"). The
Global Note will be deposited on the Closing Date with, or on behalf of, DTC and
registered in the name of a nominee of DTC.
 
     The Company expects that pursuant to procedures established by DTC (i) upon
the issuance of the Global Note, DTC or its custodian will credit, on its
internal system, the principal amount of Exchange Notes of the individual
beneficial interests represented by such Global Note to the respective accounts
for persons who have accounts with DTC and (ii) ownership of beneficial
interests in the Global Note will be shown on, and the transfer of such
ownership will be effected only through, records maintained by DTC or its
nominee (with respect to interests of participants) and the records of
participants (with respect to interests of persons other than participants).
Ownership of beneficial interests in the Global Note will be limited to persons
who have accounts with DTC ("participants") or persons who own interests through
participants. Owners of beneficial interests in the Global Note will hold their
interests in the Global Note directly through DTC, if they are participants in
such system, or indirectly through organizations which are participants in such
system.
 
     So long as DTC or its nominee is the registered owner or holder of the
Global Note, DTC or such nominee, as the case may be, will be considered the
sole owner or holder of the Notes represented by the Global Note for all
purposes under the Indenture. No beneficial owner of an interest in the Global
Note will be able to transfer that interest except in accordance with DTC's
procedures in addition to those provided for under the Indenture.
 
     Payments of the principal of, premium, if any, and interest on, the Global
Note will be made to DTC or its nominee, as the case may be, as the registered
owner thereof. None of the Company, the Trustee, the Exchange Agent or any
paying agent of the Company will have any responsibility or liability for any
aspect of the records relating to or payments made on account of beneficial
ownership interests in the Global Note or for maintaining, supervising or
reviewing any records relating to such beneficial ownership interests.
 
     The Company expects that DTC or its nominee, upon receipt of any payment of
principal, premium, if any, or interest in respect of the Global Note, will
credit participants' accounts with payments in amounts proportionate to their
respective beneficial interests in the principal amount of the Global Note as
shown on the records of DTC or its nominee. The Company also expects that
payments by participants to owners of beneficial interests in the Global Note
held through such participants will be governed by standing instructions and
customary practice, as is now the case with securities held for the accounts of
customers registered in the names of nominees for such customers. Such payments
will be the responsibility of such participants.
 
     Transfers between participants in DTC will be effected in the ordinary way
in accordance with DTC rules and will be settled in same day funds. The laws of
some states require that certain purchasers of securities take physical delivery
of such securities in definitive form. Such laws may impair the ability to
transfer beneficial interests in the Global Note.
 
     DTC has advised the Company that it will take any action permitted to be
taken by a holder of Notes (including the presentation of Old Notes for exchange
for Exchange Notes) only at the direction of one or more participants to whose
account the interests in the Global Note are credited and only in respect of
such portion of the aggregate principal amount of Notes as to which such
participant or participants have given such direction. However, if there is an
Event of Default under the Indenture, DTC will exchange the Global
 
                                       57
<PAGE>   59
 
Note for certificated Notes in registered form ("Certificated Securities"),
which it will distribute to its participants.
 
     DTC has advised the Company as follows: DTC is a limited purpose trust
company organized under laws of the State of New York, a member of the Federal
Reserve System, a "clearing corporation" within the meaning of the Uniform
Commercial Code and a "clearing agency" registered pursuant to the provisions of
Section 17A of the Exchange Act. DTC was created to hold securities for its
participants and facilitate the clearance and settlement of securities
transactions between participants through electronic book-entry changes in
accounts of its participants, thereby eliminating the need for physical movement
of certificates. Participants include securities brokers and dealers, banks,
trust companies and clearing corporations and certain other organizations.
Indirect access to the DTC system is available to others such as banks, brokers,
dealers and trust companies that clear through or maintain a custodial
relationship with a participant, either directly or indirectly.
 
     Although DTC has agreed to the foregoing procedures in order to facilitate
transfers of interests in the Global Note among participants of DTC, it is under
no obligation to perform such procedures, and such procedures may be
discontinued at any time. None of the Company, the Initial Purchasers, the
Trustee or the Exchange Agent will have any responsibility for the performance
by DTC or its participants or indirect participants of their respective
obligations under the rules and procedures governing their operations.
 
     If DTC is at any time unwilling or unable to continue as a depositary for
the Global Note and a successor depositary is not appointed by the Company
within 90 days, or at the Company's election at any time, Certificated
Securities will be issued in exchange for the Global Note.
 
                         REGISTRATION RIGHTS AGREEMENT
 
     Pursuant to the Registration Rights Agreement, the Company agreed to file
with the SEC the Exchange Offer Registration Statement on the appropriate form
under the Securities Act with respect to an offer to exchange the Old Notes for
the Exchange Notes. The Registration Statement of which this Prospectus is a
part constitutes such Exchange Offer Registration Statement, and pursuant to the
Exchange Offer described herein the Company is offering to the holders of Notes
who are able to make certain representations the opportunity to exchange their
Old Notes for Exchange Notes.
 
     If (i) the Company is not permitted to file the Exchange Offer Registration
Statement or to consummate the Exchange Offer because the Exchange Offer is not
permitted by applicable law or interpretation of the staff of the SEC or (ii)
any holder of Old Notes notifies the Company within the specified time period
that (A) due to a change in law or policy it is not entitled to participate in
the Exchange Offer, (B) due to a change in law or policy it may not resell the
Exchange Notes acquired by it in the Exchange Offer to the public without
delivering a prospectus and the prospectus contained in the Exchange Offer
Registration Statement is not appropriate or available for such resales by such
holder or (C) it is a broker-dealer and owns Old Notes acquired directly from
the Company or an affiliate of the Company, the Company will file with the SEC
the Shelf Registration Statement to cover resales of the Transfer Restricted
Notes (as defined) by the holders thereof. The Company will use its best efforts
to cause the applicable registration statement to be declared effective by the
SEC within specified periods. For purposes of the foregoing, "Transfer
Restricted Notes" means each Note until (i) the date on which such Note has been
exchanged by a person other than a broker-dealer for an Exchange Note in the
Exchange Offer, (ii) following the exchange by a broker-dealer in the Exchange
Offer of an Old Note for an Exchange Note, the date on which such Exchange Note
is sold to a purchaser who receives from such broker-dealer on or prior to the
date of such sale a copy of the prospectus contained in the Exchange Offer
Registration Statement, (iii) the date on which such Note has been effectively
registered under the Securities Act and disposed of in accordance with the Shelf
Registration Statement or (iv) the date on which such Note is distributed to the
public pursuant to Rule 144 under the Securities Act.
 
     Under existing SEC interpretations, the Transfer Restricted Notes would, in
general, be freely transferable after the Exchange Offer without further
registration under the Securities Act; provided, however, that in
 
                                       58
<PAGE>   60
 
the case of broker-dealers participating in the Exchange Offer, a prospectus
meeting the requirements of the Securities Act will be delivered upon resale by
such broker-dealers in connection with resales of Exchange Notes. The Company
has agreed, for a period of 180 days after consummation of the Exchange Offer,
to make available a prospectus meeting the requirements of the Securities Act to
any broker-dealer for use in connection with any resale of Exchange Notes
acquired in the Exchange Offer (other than a resale of any unsold allotment from
the original sale of the Old Notes). A broker-dealer which delivers such a
prospectus to purchasers in connection with such resales will be subject to
certain of the civil liability provisions under the Securities Act and will be
bound by the provisions of the Registration Rights Agreement (including certain
indemnification rights and obligations).
 
     The Registration Rights Agreement provides that: (i) unless the Exchange
Offer would not be permitted by applicable law or SEC policy, the Company will
file an Exchange Offer Registration Statement with the SEC on or prior to 60
days after the date of original issuance of the Notes (the "Closing Date," which
was August 7, 1997), (ii) unless the Exchange Offer would not be permitted by
applicable law or SEC policy, the Company will use its best efforts to have the
Exchange Offer Registration Statement declared effective by the SEC on or prior
to 120 days after the Closing Date, (iii) unless the Exchange Offer would not be
permitted by applicable law or SEC policy, the Company will commence the
Exchange Offer and use its best efforts to issue, on or prior to 30 business
days after the date on which the Exchange Offer Registration Statement was
declared effective by the SEC, Exchange Notes in exchange for all Old Notes
tendered prior thereto in the Exchange Offer and (iv) if obligated to file the
Shelf Registration Statement, the Company will file on or prior to the later of
(x) 90 days after the Closing Date or (y) 30 days after such filing obligation
arises, and use its best efforts to cause the Shelf Registration Statement to be
declared effective by the SEC on or prior to 90 days after such obligation
arises; provided that if the Company has not consummated the Exchange Offer
within 180 days of the Closing Date, then the Company will file the Shelf
Registration Statement with the SEC on or prior to the 181st day after the
Closing Date and use its best efforts to cause the Shelf Registration Statement
to be declared effective within 60 days after such filing. The Company shall use
its best efforts to keep such Shelf Registration Statement continuously
effective, supplemented and amended until the second anniversary of the Closing
Date or such shorter period that will terminate when all the Transfer Restricted
Notes covered by the Shelf Registration Statement have been sold pursuant
thereto.
 
     If (i) the Company fails to file any of the registration statements
required by the Registration Rights Agreement on or before the date specified
for such filing, (ii) any of such registration statements are not declared
effective by the SEC on or prior to the date specified for such effectiveness,
(iii) the Company fails to consummate the Exchange Offer within 30 business days
of the effective date of the Exchange Offer Registration Statement, or (iv) the
Shelf Registration Statement or the Exchange Offer Registration Statement is
declared effective but thereafter, subject to certain exceptions, ceases to be
effective or usable in connection with the Exchange Offer or resales of Transfer
Restricted Notes, as the case may be, during the periods specified in the
Registration Rights Agreement (each such event referred to in clauses (i)
through (iv) above, a "Registration Default"), then the interest rate on
Transfer Restricted Notes will increase ("Additional Interest"), with respect to
the first 90-day period immediately following the occurrence of such
Registration Default by 0.50% per annum and will increase by an additional 0.50%
per annum with respect to each subsequent 90-day period until all Registration
Defaults have been cured, up to a maximum amount of 2% per annum with respect to
all Registration Defaults. Following the cure of all Registration Defaults, the
accrual of Additional Interest will cease and the interest rate will revert to
the original rate.
 
                                       59
<PAGE>   61
 
                       TRANSFER RESTRICTIONS ON OLD NOTES
 
     The Old Notes have not been registered under the Securities Act and may not
be offered or sold within the United States or to, or for the account or benefit
of, U.S. persons except pursuant to an exemption from, or in a transaction not
subject to, the registration requirements of the Securities Act. Accordingly,
the Old Notes were offered and sold only to "Qualified Institutional Buyers" (as
defined in Rule 144A under the Securities Act) in compliance with Rule 144A.
 
     Each purchaser of Old Notes was deemed to have acknowledged, represented
and agreed as follows:
 
          (1) it is purchasing the Old Notes for its own account or an account
     with respect to which it exercises sole investment discretion and that it
     and any such account is a Qualified Institutional Buyer, for investment and
     not with a view to distribution;
 
          (2) the Old Notes have not been registered under the Securities Act
     and may not be offered or sold within the United States or to, or for the
     account or benefit of, U.S. persons except as set forth below;
 
          (3) if it should resell or otherwise transfer the Old Notes within two
     years after the original issuance of the Old Notes, it will do so only (a)
     to the Company or any of its subsidiaries, (b) inside the United States to
     a Qualified Institutional Buyer in compliance with Rule 144A, (c) inside
     the United States to an Accredited Investor (as defined in Rule 501(a)(1),
     (2) (3) or (7) under the Securities Act) that, prior to such transfer,
     furnishes to the Trustee a signed letter containing certain representations
     and agreements relating to the restrictions on transfer of the Notes (the
     form of which letter can be obtained from such Trustee), (d) outside the
     United States in compliance with Rule 904 of Regulation S under the
     Securities Act, (e) pursuant to Rule 144 under the Securities Act, or (f)
     pursuant to an effective registration statement under the Securities Act;
 
          (4) it will give to each transferee of the Old Notes notice of any
     restrictions on transfer of such Old Notes;
 
          (5) none of the Company or the Initial Purchasers or any person
     representing the Company or the Initial Purchasers has made any
     representation to it with respect to the Company or the offering or sale of
     any Old Notes, other than the information contained in the Offering
     Memorandum provided with such Old Notes, which has been delivered to it and
     upon which it is relying in making its investment decision with respect to
     the Old Notes, accordingly it acknowledges that no representation or
     warranty is made by the Company or the Initial Purchasers as to the
     accuracy or completeness of such materials;
 
          (6) it has had access to such financial and other information
     concerning the Company and the Old Notes as it has deemed necessary in
     connection with its decision to purchase the Old Notes, including an
     opportunity to ask questions of and request information from the Company
     and the Initial Purchasers;
 
          (7) the Trustee will not be required to accept for registration of
     transfer any Old Notes acquired by it, except upon presentation of evidence
     satisfactory to the Company and the Trustee that the restrictions set forth
     herein have been complied with;
 
          (8) the Company, the Trustee, the Initial Purchasers and others will
     rely upon the truth and accuracy of the foregoing acknowledgments,
     representations and agreements and agrees that, if any of the
     acknowledgments, representations or agreements deemed to have been made by
     its purchase of the Old Notes are no longer accurate, it shall promptly
     notify the Initial Purchasers; and
 
          (9) if it is acquiring the Old Notes as a fiduciary or agent for one
     or more investor accounts, it represents that it has sole investment
     discretion with respect to each such account and it has full power to make
     the foregoing acknowledgments, representations and agreements on behalf of
     each account.
 
     Each certificate respecting the Old Notes bears the following legend:
 
     THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED (THE "SECURITIES ACT"), OR ANY STATE SECURITIES LAWS AND, ACCORDINGLY,
MAY NOT BE OFFERED OR SOLD EXCEPT AS SET FORTH BELOW. BY ITS
 
                                       60
<PAGE>   62
 
ACQUISITION HEREOF, THE HOLDER (1) REPRESENTS THAT (A) IT IS A "QUALIFIED
INSTITUTIONAL BUYER" (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) OR (B)
IT IS AN INSTITUTIONAL "ACCREDITED INVESTOR" (AS DEFINED IN RULE 501(a)(1), (2),
(3) OR (7) UNDER THE SECURITIES ACT) (AN "ACCREDITED INVESTOR") OR (C) IT IS NOT
A U.S. PERSON AND IS ACQUIRING THIS SECURITY IN AN OFFSHORE TRANSACTION, (2)
AGREES THAT IT WILL NOT WITHIN TWO YEARS AFTER THE ORIGINAL ISSUANCE OF THIS
SECURITY RESELL OR OTHERWISE TRANSFER THIS SECURITY EXCEPT (A) TO THE ISSUER OR
ANY SUBSIDIARY THEREOF, (B) INSIDE THE UNITED STATES TO A QUALIFIED
INSTITUTIONAL BUYER IN COMPLIANCE WITH RULE 144A UNDER THE SECURITIES ACT, (C)
INSIDE THE UNITED STATES TO AN ACCREDITED INVESTOR THAT, PRIOR TO SUCH TRANSFER,
FURNISHES TO THE TRUSTEE A SIGNED LETTER CONTAINING CERTAIN REPRESENTATIONS AND
AGREEMENTS (THE FORM OF WHICH LETTER CAN BE OBTAINED FROM THE TRUSTEE), (D)
OUTSIDE THE UNITED STATES TO FOREIGN PURCHASERS IN OFFSHORE TRANSACTIONS MEETING
THE REQUIREMENTS OF RULE 904 OF REGULATION S UNDER THE SECURITIES ACT, (E)
PURSUANT TO THE EXEMPTION FROM REGISTRATION PROVIDED BY RULE 144 UNDER THE
SECURITIES ACT (IF AVAILABLE), OR (F) PURSUANT TO AN EFFECTIVE REGISTRATION
STATEMENT UNDER THE SECURITIES ACT AND (3) AGREES THAT IT WILL GIVE TO EACH
PERSON TO WHOM THIS SECURITY IS TRANSFERRED A NOTICE SUBSTANTIALLY TO THE EFFECT
OF THIS LEGEND. AS USED HEREIN, THE TERMS "OFFSHORE TRANSACTION," "UNITED
STATES" AND "U.S. PERSON" HAVE THE RESPECTIVE MEANINGS GIVEN TO THEM IN
REGULATION S UNDER THE SECURITIES ACT.
 
     Any Old Notes not exchanged in the Exchange Offer for Exchange Notes will
continue to be subject to the transfer restrictions described above.
 
                   CERTAIN FEDERAL INCOME TAX CONSIDERATIONS
 
     The following is a summary of certain federal income tax consequences
associated with the Exchange Offer, and also with respect to the acquisition,
ownership, and disposition of the Exchange Notes. The following summary does not
discuss all of the aspects of federal income taxation that may be relevant to a
prospective holder of Exchange Notes in light of his or her particular
circumstances, or to certain types of holders which are subject to special
treatment under the federal income tax laws (including persons who hold Exchange
Notes as part of a conversion, straddle or hedge, dealers in securities,
insurance companies, tax-exempt organizations, financial institutions,
broker-dealers and S corporations). Further, the summary pertains only to
holders that are citizens or residents of the United States, corporations,
partnerships or other entities created in or under the laws of the United States
or any political subdivision thereof, or estates or trusts the income of which
is subject to United States federal income taxation regardless of its source. In
addition, this summary does not describe any tax consequences under state,
local, or foreign tax laws.
 
     The discussion is based upon the Internal Revenue Code of 1986, as amended
(the "Code"), Treasury Regulations (the "Regulations"), rulings and
pronouncements issued by the Internal Revenue Service ("IRS") and judicial
decisions now in effect, all of which are subject to change at any time by
legislative, judicial or administrative action. Any such changes may be applied
retroactively in a manner that could adversely affect holders of Exchange Notes.
The Company has not sought and will not seek any rulings from the IRS or
opinions from counsel with respect to the matters discussed below, although such
discussion is based on the advice of Griggs & Harrison, P.C., counsel to the
Company. There can be no assurance that the IRS will not take positions
concerning the tax consequences of the valuation, purchase, ownership or
disposition of the Exchange Notes which are different from those discussed
herein.
 
     THIS SUMMARY DOES NOT PURPORT TO COVER ALL THE POSSIBLE TAX CONSEQUENCES OF
THE PURCHASE, OWNERSHIP AND DISPOSITION OF THE EXCHANGE NOTES, AND IS NOT
INTENDED AS TAX ADVICE. PROSPECTIVE PURCHASERS OF EXCHANGE NOTES SHOULD CONSULT
THEIR TAX ADVISORS WITH RESPECT TO THE UNITED STATES
 
                                       61
<PAGE>   63
 
FEDERAL INCOME TAX CONSEQUENCES THAT MAY BE SPECIFIC TO THEM OF ACQUIRING,
OWNING AND DISPOSING OF EXCHANGE NOTES, AS WELL AS THE APPLICATION OF STATE,
LOCAL, FOREIGN AND OTHER TAX LAWS.
 
EXCHANGE OFFER
 
     Under federal income tax law, a holder of Old Notes will not recognize gain
or loss upon an exchange of the Old Notes for Exchange Notes pursuant to the
Exchange Offer. A holder's basis and holding period for the Exchange Notes
received pursuant to the Exchange Offer will be the same as such holder's basis
and holding period for the Old Notes exchanged therefor.
 
     Each exchanging holder should consult with its individual tax advisor as to
any foreign, state and local tax consequences of the Exchange Offer as well as
to the effect of such holder's particular facts and circumstances on the matters
discussed herein.
 
TAXATION OF QUALIFIED STATED INTEREST ON EXCHANGE NOTES
 
     Absent some special circumstances that may be particular to a holder,
qualified stated interest paid on an Exchange Note will be taxable to a holder
as ordinary interest income at the time it accrues or is received, in accordance
the holder's regular method of accounting for federal income tax purposes.
 
     The Company will annually furnish to certain record holders of the Exchange
Notes and to the IRS information with respect to qualified stated interest paid
during the calendar year as may be required under applicable regulations.
 
SALE OR OTHER TAXABLE DISPOSITION OF EXCHANGE NOTES
 
     The sale, redemption, or other taxable disposition of an Exchange Note will
result in the recognition of gain or loss to the holder in an amount equal to
the difference between (a) the amount of cash and fair market value of property
received (except to the extent attributable to the payment of accrued stated
interest) in exchange therefor and (b) the holder's adjusted tax basis in such
Exchange Note.
 
     A holder's initial tax basis in an Exchange Note purchased by such holder
will be equal to the portion of the issue price allocable to the Exchange Notes.
The holder's initial tax basis in an Exchange Note will be increased by the
amount of any original issue discount included in gross income with respect to
such Exchange Note to the date of disposition.
 
     Any gain or loss on the sale, redemption, or other taxable disposition of
an Exchange Note will be capital gain or loss, assuming the owner of the
Exchange Note holds such security as a "capital asset" (generally property held
for investment) within the meaning of Section 1221 of the Code. Any capital gain
or loss will be long-term capital gain or loss if the Exchange Note is held for
more than one year and otherwise will be short-term capital gain or loss.
Payments on such disposition for accrued stated interest not previously included
in income will be treated as ordinary interest income.
 
     If the Exchange Offer is not consummated within the required period of time
(and in certain other circumstances), then Additional Interest may become
payable with respect to the Notes. See "Registration Rights Agreement." This
rate increase should not result in a deemed taxable exchange of the Notes.
 
PURCHASERS OF NOTES AT OTHER THAN ORIGINAL ISSUANCE PRICE OR DATE
 
     The foregoing does not discuss special rules which may affect the treatment
of purchasers that acquired Old Notes either (a) other than at the time of
original issuance or (b) at the time of original issuance other than at the
issue price, including those provisions of the Code relating to the treatment of
"market discount," "acquisition premium" and "amortizable bond premium." Any
such purchaser should consult its tax advisor as to the consequences to such
purchaser of the acquisition, ownership, and disposition of Notes.
 
                                       62
<PAGE>   64
 
BACKUP WITHHOLDING
 
     The backup withholding rules require a payor to deduct and withhold a tax
if (a) the payee fails to properly furnish a taxpayer identification number
("TIN") to the payor, (b) the IRS notifies the payor that the TIN furnished by
the payee is incorrect, (c) the payee has failed to report properly the receipt
of "reportable payments" and the IRS has notified the payor that withholding is
required, or (d) there has been a failure of the payee to certify under the
penalty of perjury that a payee is not subject to withholding under Section 3406
of the Code. As a result, if any one of the events discussed above occurs with
respect to a holder of Notes, the Company, its paying agent or other withholding
agent will be required to withhold a tax equal to 31% of any "reportable
payment" made in connection with the Notes of such holder. A "reportable
payment" includes, among other things, amounts paid in respect of interest or
original issue discount and amounts paid through brokers in retirement of
securities. Any amounts withheld from a payment to a holder under the backup
withholding rules will be allowed as a refund or credit against such holder's
federal income tax, provided, that the required information is furnished to the
IRS. Certain holders (including, among others, corporations and certain
tax-exempt organizations) are not subject to the backup withholding rules.
 
                              PLAN OF DISTRIBUTION
 
     Each broker-dealer that receives Exchange Notes for its own account
pursuant to the Exchange Offer may be a statutory underwriter and must
acknowledge that it will deliver a prospectus in connection with any resale of
such Exchange Notes. This Prospectus, as it may be amended or supplemented from
time to time, may be used by a broker-dealer in connection with resales of
Exchange Notes received in exchange for Old Notes where such Old Notes were
acquired as a result of market-making activities or other trading activities.
The Company has agreed that it will make this Prospectus, as amended or
supplemented, available to any broker-dealer for use in connection with any such
resale for a period of 180 days after consummation of the Exchange Offer, or
such shorter period as will terminate when all Old Notes acquired by
broker-dealers for their own accounts as a result of market-making activities or
other trading activities have been exchanged for Exchange Notes and resold by
such broker-dealers. A broker-dealer that delivers such a prospectus to
purchasers in connection with such resales will be subject to certain of the
civil liability provisions under the Securities Act and will be bound by the
provisions of the Registration Rights Agreement (including certain
indemnification rights and obligations).
 
     The Company will not receive any proceeds from any sale of Exchange Notes
by broker-dealers. Exchange Notes received by broker-dealers for their own
account pursuant to the Exchange Offer may be sold from time to time in one or
more transactions in the over-the-counter market, in negotiated transactions,
through the writing of options on the Exchange Notes or a combination of such
methods of resale, at market prices prevailing at the time of resale, at prices
related to such prevailing market prices or negotiated prices. Any such resale
may be made directly to purchasers or to or through brokers or dealers who may
receive compensation in the form of commissions or concessions from any such
broker-dealer and/or the purchasers of any such Exchange Notes. Any
broker-dealer that resells Exchange Notes that were received by it for its own
account pursuant to the Exchange Offer and any broker or dealer that
participates in a distribution of such Exchange Notes may be deemed to be an
"underwriter" within the meaning of the Securities Act and any profit on any
such resale of Exchange Notes and any commissions or concessions received by any
such persons may be deemed to be underwriting compensation under the Securities
Act. For a period of 180 days after consummation of the Exchange Offer, or such
shorter period as will terminate when all Old Notes acquired by broker-dealers
for their own accounts as a result of market-making activities or other trading
activities have been exchanged for Exchange Notes and resold by such
broker-dealers, the Company will promptly send additional copies of this
Prospectus and any amendment or supplement to this Prospectus to any
broker-dealer that requests such documents in the Letter of Transmittal. The
Company has agreed in the Registration Rights Agreement to indemnify such
broker-dealers against certain liabilities, including liabilities under the
Securities Act.
 
                                       63
<PAGE>   65
 
                                    EXPERTS
 
     The validity of the issuance of the Notes offered hereby will be passed
upon for the Company by Griggs & Harrison, P.C., Houston, Texas.
 
   
     The Consolidated Financial Statements and schedule of the Company appearing
in the Company's Annual Report (Form 10-K/A (Amendment No. 3)) for the year
ended December 31, 1996, have been audited by Ernst & Young LLP, independent
auditors, as set forth in their report thereon included therein. Such
Consolidated Financial Statements and schedule are incorporated herein by
reference in reliance upon such report given upon the authority of such firm as
experts in accounting and auditing.
    
 
     The Consolidated Financial Statements of Southwestern Offshore Corporation
and Subsidiaries at December 31, 1995 and 1994 and for the years ended December
31, 1995 and 1994 and for the period from inception (July 19, 1993) through
December 31, 1993 included in the Company's Current Report on Form 8-K dated May
23, 1996, incorporated by reference in this Prospectus, have been audited by
Arthur Andersen LLP, independent public accountants, as indicated in their
report with respect thereto, and are included herein in reliance upon the
authority of said firm as experts in accounting and auditing in giving said
report.
 
                                       64
<PAGE>   66
 
                                    PART II
 
                   INFORMATION NOT REQUIRED IN THE PROSPECTUS
 
ITEM 20. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
GENERAL
 
     Article Ninth of the Company's Certificate of Incorporation ("Article
Ninth") requires the Company to indemnify its directors, officers and certain
other individuals to the full extent permitted by the Delaware General
Corporation Law ("Delaware GCL") or other applicable laws and allows the Company
to enter into agreements with any person to provide greater or different
indemnification than that provided in Article Ninth or the Delaware GCL.
 
     Article Tenth of the Company's Certificate of Incorporation ("Article
Tenth") limits the personal liability of the Company's directors to the Company
or its stockholders to the full extent permitted by the Delaware GCL, which
currently permits directors to be protected from monetary damages for breach of
their fiduciary duty of care. This limitation has no effect on claims arising
under the federal securities laws.
 
INDEMNIFICATION AND INSURANCE
 
     Under the Delaware GCL, directors and officers as well as other employees
and individuals may be indemnified against expenses (including attorneys' fees),
judgments, fines and amounts paid in settlement in connection with specified
actions, suits or proceedings, whether civil, criminal, administrative or
investigative (other than an action by or in the right of the corporation such
as a derivative action) if they acted in good faith and in a manner they
reasonably believed to be in or not opposed to the best interests of the
corporation, and, with respect to any criminal action or proceeding, had no
reasonable cause to believe their conduct was unlawful. A similar standard of
care is applicable in the case of actions by or in the right of the corporation,
except that indemnification only extends to expenses (including attorneys' fees)
incurred in connection with defense or settlement of such an action and the
Delaware GCL requires court approval before there can be any indemnification
where the person seeking indemnification has been found liable to the
corporation.
 
     Article Ninth provides that each person who is or was or had agreed to
become a director or officer of the Company, and each such person who is or was
serving or who had agreed to serve at the request of the Board of Directors or
an officer of the Company as an employee or agent of the Company, or as a
director, officer, employee or agent of another corporation, partnership, joint
venture, trust or other enterprise (including the heirs, executors,
administrators or estate of such person) shall be indemnified by the Company to
the full extent permitted by the Delaware GCL or any other applicable laws as
presently or hereafter in effect. Under Article Ninth, subject to the
limitations on indemnification imposed by the Delaware GCL, a large award
against an officer or director or other appropriate individual could be paid by
the Company, which could affect the assets of the Company.
 
     Article Ninth provides that, without limiting the generality or effect of
the foregoing, the Company may enter into one or more agreements with any person
which provide for indemnification greater or different than that provided in
Article Ninth. Finally, Article Ninth and Article Tenth each provide that any
repeal or modification of such article shall not adversely affect any right or
protection existing thereunder immediately prior to such repeal or modification.
 
     The Company has entered into agreements with each of its directors and
certain officers providing for indemnification broader than that provided by
Article Ninth. Each of the directors and certain officers are entitled to
indemnification pursuant to the indemnification agreements whether his or her
acts, failures to act, neglect or breach of duty giving rise to the right to
indemnity thereunder occurred prior or subsequent to the date of such agreement.
Such right, however, would not be available with respect to acts, failures to
act, neglect or breaches of duty of a director or officer occurring prior to the
date such person became a director or officer of the Company.
 
                                      II-1
<PAGE>   67
 
     One of the purposes of entering into such indemnification agreements was to
specify the extent to which the directors and certain officers may receive
indemnification under circumstances in which indemnity would not otherwise be
provided by Article Ninth. Such agreements entitle the directors and officers to
indemnification as expressly provided by Article Ninth and to indemnification
for any amount which a director or officer is or becomes legally obligated to
pay relating to or arising out of any claim made against such director or
officer because of any act, failure to act or neglect or breach of duty,
including, without limitation, any actual or alleged error, misstatement or
misleading statement, which such director or officer commits, suffers, permits
or acquiesces in while acting in the director's or officer's position with the
Company. The right to receive payments under the proposed indemnification
agreements in excess of those expressly provided in Article Ninth would not be
permitted, however, in connection with any claim against a director or officer:
 
          (i) which results in a final, nonappealable order against the director
     or officer to pay a fine or similar governmental imposition which the
     Company is prohibited by applicable law from paying; or
 
          (ii) to the extent based upon or attributable to the director or
     officer gaining in fact a personal profit to which he or she was not
     legally entitled, including, without limitation, profits made from the
     purchase and sale of equity securities of the Company which are recoverable
     by the Company pursuant to Section 16(b) of the Securities Exchange Act of
     1934 and profits arising from transactions in publicly traded securities of
     the Company which were effected by the director or officer in violation of
     Section 10(b) of the Securities Exchange Act of 1934, including rule 10b-5
     promulgated thereunder.
 
     Another purpose of the indemnification agreements is to provide the
directors or officers with increased assurance of indemnification by prohibiting
the Company from adopting any amendment to the Company's Certificate of
Incorporation or Bylaws which would have the effect of denying, diminishing or
encumbering their rights to indemnification pursuant thereto or to the Delaware
GCL or any other law as applied to any act or failure to act occurring in whole
or in part prior to the effective date of such amendment.
 
     At present there is no pending litigation or proceeding involving a
director or officer of the Company in which indemnification would be required or
permitted by the proposed indemnification agreements. The Board of Directors is
not aware of any threatened litigation or proceeding which may result in a claim
for indemnification under any such indemnification agreement.
 
ELIMINATION OF LIABILITY IN CERTAIN CIRCUMSTANCES
 
     Under the Delaware GCL, Article Tenth would protect the Company's directors
against monetary damages for breaches of their duty of care, except as set forth
below. The inclusion of Article Tenth in the Company's Certificate of
Incorporation means that the Company and its stockholders would forego the
ability to bring a cause of action against a director for monetary damages for
certain breaches of fiduciary duty, including actions in connection with
proposals for the acquisition of control of the Company. Directors remain liable
for breaches of their duty of loyalty to the Company and its stockholders as
well as acts or omissions not in good faith or which involve intentional
misconduct or a knowing violation of law and transactions from which a director
derives improper personal benefit. Also, Article Tenth does not eliminate
director liability under Section 174 of the Delaware GCL, which makes directors
personally liable for unlawful dividends or unlawful stock repurchases or
redemptions and expressly sets forth a negligence standard with respect to such
liability.
 
     Although Article Tenth provides directors with protection from awards of
monetary damages for breaches of the duty of care, it does not eliminate the
directors' duty of care. Accordingly, Article Tenth will have no effect on the
availability of equitable remedies such as an injunction or rescission based
upon a director's breach of the duty of care. The provisions of Article Tenth
which eliminate liability as described above will apply to officers of the
Company only if they are directors of the Company and are acting in their
capacity as directors, and will not apply to officers of the Company who are not
directors.
 
                                      II-2
<PAGE>   68
 
ITEM 21. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
     The following instruments and documents are included as Exhibits to this
Registration Statement. Exhibits incorporated by reference are so indicated by
parenthetical information.
 
<TABLE>
<CAPTION>
      EXHIBIT NO.                                  EXHIBIT
      -----------                                  -------
<C>                      <S>
           2.1           -- Reorganization and Distribution Agreement dated as of
                            June 8, 1988 among Cleveland-Cliffs Inc, The
                            Cleveland-Cliffs Iron Company, Cliffs Drilling Company,
                            now Cliffs Resources, Inc., Cliffs Exploration Company,
                            now Cliffs Oil and Gas Company, Cliffs Drilling
                            International, Inc. and New Cliffs Drilling Company, now
                            Cliffs Drilling Company, the Registrant (the "Company")
                            (incorporated by reference to Exhibit 2.1 to the
                            Company's Registration Statement on Form S-1, No.
                            33-23508, filed under the Securities Act).
           2.2           -- Acquisition Agreement dated as of May 13, 1996 by and
                            among Southwestern Offshore Corporation, Viking Supply
                            Ships A.S., Ocean Master III Inc., Production Partner
                            Inc., Trivium Investments Limited, Helge Ringdal and the
                            Company, Cliffs Drilling Asset Acquisition Company and
                            Cliffs Drilling Merger Company (incorporated by reference
                            to Exhibit 2.2 to the Company's Current Report on Form
                            8-K dated May 23, 1996).
           3.1.1         -- Certificate of Incorporation of New Cliffs Drilling
                            Company (incorporated by reference to Exhibit 3.1.1 to
                            the Company's Quarterly Report on Form 10-Q for the
                            quarter ended June 30, 1997).
           3.1.2         -- Certificate of Amendment of Certificate of Incorporation
                            (incorporated by reference to Exhibit 3.1.2 to the
                            Company's Quarterly Report on Form 10-Q for the quarter
                            ended June 30, 1997).
           3.1.3         -- Certificate of Designations of $2.3125 Convertible
                            Exchangeable Preferred Stock of Cliffs Drilling Company
                            (incorporated by reference to Exhibit 3.1.3 to the
                            Company's Quarterly Report on Form 10-Q for the quarter
                            ended June 30, 1997).
           3.1.4         -- Certificate of Amendment of Certificate of Incorporation
                            of Cliffs Drilling Company (incorporated by reference to
                            Exhibit 3.1.4 to the Company's Quarterly Report on Form
                            10-Q for the quarter ended June 30, 1997).
           3.1.5         -- Certificate of Elimination of $2.3125 Convertible
                            Exchangeable Preferred Stock of Cliffs Drilling Company
                            (incorporated by reference to Exhibit 3.1.5 to the
                            Company's Quarterly Report on Form 10-Q for the quarter
                            ended June 30, 1997).
           3.1.6         -- Certificate of Designations of Series A Junior
                            Participating Preferred Stock of Cliffs Drilling Company
                            (incorporated by reference to Exhibit 3.1.6 to the
                            Company's Quarterly Report on Form 10-Q for the quarter
                            ended June 30, 1997).
           4.1           -- Certificate of Incorporation of Cliffs Drilling Company
                            (included as Exhibits 3.1.1, 3.1.2, 3.1.3, 3.1.4, 3.1.5
                            and 3.1.6).
           4.2           -- By-Laws of the Company (incorporated by reference to
                            Exhibit 3.2 to the Company's Registration Statement on
                            Form S-1, No. 33-23508, filed under the Securities Act).
           4.3           -- Indenture dated as of May 15, 1996 among the Company, as
                            issuer, Cliffs Drilling Asset Acquisition Company, Cliffs
                            Drilling Merger Company, Cliffs Drilling International,
                            Inc. and Cliffs Oil and Gas Company, as subsidiary
                            guarantors, and Fleet National Bank, predecessor of State
                            Street Bank and Trust Company, as trustee, including a
                            Form of the Company's 10.25% Senior Notes due 2003
                            (incorporated by reference to Exhibit 4.3 to the
                            Company's Current Report on Form 8-K dated May 23, 1996).
</TABLE>
 
                                      II-3
<PAGE>   69
<TABLE>
<CAPTION>
      EXHIBIT NO.                                  EXHIBIT
      -----------                                  -------
<C>                      <S>
           4.3.1         -- First Supplemental Indenture dated as of July 11, 1996
                            among the Company, as issuer, Southwestern Offshore
                            Corporation (f/k/a Cliffs Drilling Asset Acquisition
                            Company), Cliffs Drilling Merger Company, Cliffs Drilling
                            International, Inc., Cliffs Oil and Gas Company, and DRL,
                            Inc., as subsidiary guarantors, and Fleet National Bank,
                            predecessor of State Street Bank and Trust Company, as
                            trustee (incorporated by reference to Exhibit 4.3.1 to
                            the Company's Registration Statement on Form S-4, No.
                            333-08273 filed July 17, 1996).
           4.3.2         -- Second Supplemental Indenture dated as of January 24,
                            1997 among the Company, as issuer, Southwestern Offshore
                            Corporation (f/k/a Cliffs Drilling Asset Acquisition
                            Company), Cliffs Drilling Merger Company, Cliffs Drilling
                            International, Inc., Cliffs Oil and Gas Company, DRL,
                            Inc., and Greenbay Drilling Company Ltd., as subsidiary
                            guarantors, and Fleet National Bank, predecessor of State
                            Street Bank and Trust Company, as trustee (incorporated
                            by reference to Exhibit 4.6.2 to the Company's Annual
                            Report on Form 10-K for the fiscal year ended December
                            31, 1996).
           4.3.3*        -- Third Supplemental Indenture dated as of August 29, 1997
                            among the Company, as issuer, Southwestern Offshore
                            Corporation (f/k/a Cliffs Drilling Asset Acquisition
                            Company), Cliffs Drilling Merger Company, Cliffs Drilling
                            International, Inc., Cliffs Oil and Gas Company, DRL,
                            Inc., Cliffs Drilling Trinidad Ltd. and the West Indies
                            Drilling Joint Venture, as subsidiary guarantors, and
                            State Street Bank and Trust Company, successor to Fleet
                            National Bank, as trustee.
           4.4*          -- Indenture dated as of August 7, 1997 among the Company,
                            as issuer, Southwestern Offshore Corporation, Cliffs
                            Drilling Merger Company, Cliffs Drilling International,
                            Inc., Cliffs Oil and Gas Company and DRL, Inc., as
                            subsidiary guarantors, and State Street Bank and Trust
                            Company, as trustee, including a form of the Company's
                            10.25% Senior Notes due 2003.
           4.4.1*        -- First Supplemental Indenture dated as of August 29, 1997
                            among the Company, as issuer, Southwestern Offshore
                            Corporation, Cliffs Drilling Merger Company, Cliffs
                            Drilling International, Inc., Cliffs Oil and Gas Company,
                            DRL, Inc., Cliffs Drilling Trinidad Ltd. and the West
                            Indies Drilling Joint Venture, as subsidiary guarantors,
                            and State Street Bank and Trust Company, as trustee.
           4.5*          -- Registration Rights Agreement dated as of July 31, 1997
                            by and among the Company, Southwestern Offshore
                            Corporation, Cliffs Drilling Merger Company, Cliffs
                            Drilling International, Inc., Cliffs Oil and Gas Company,
                            DRL, Inc., Jefferies & Company, Inc. and ING Baring
                            (U.S.) Securities, Inc.
           5.1*          -- Opinion of Griggs & Harrison, P.C.
          12.1*          -- Statement re Computation of Ratio of Earnings to Fixed
                            Charges.
          23.1**         -- Consent of Ernst & Young LLP.
          23.2**         -- Consent of Arthur Andersen, LLP.
          23.3*          -- Consent of Griggs & Harrison, P.C. (included in Exhibit
                            5.1).
          24.1*          -- Powers of Attorney (included on the signature pages of
                            this Registration Statement).
          25.1           -- Statement of Eligibility of Fleet National Bank,
                            predecessor of State Street Bank and Trust Company, dated
                            July 15, 1996 (incorporated by reference to Exhibit 25.1
                            to the Company's Registration Statement on Form S-4, No.
                            333-08273 filed July 17, 1996).
          25.2*          -- Statement of Eligibility of State Street Bank and Trust
                            Company dated September 22, 1997.
          99.1**         -- Form of Letter of Transmittal.
</TABLE>
 
- ---------------
 
 * Previously filed
 
** Filed herewith
 
                                      II-4
<PAGE>   70
 
ITEM 22. UNDERTAKINGS
 
     The Company hereby undertakes that, for purposes of determining any
liability under the Securities Act, each filing of the Company's annual report
pursuant to section 13(a) or section 15(d) of the Exchange Act (and, where
applicable, each filing of an employee benefit plan's annual report pursuant to
section 15(d) of the Exchange Act) that is incorporated by reference in the
Registration Statement 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.
 
     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the Company
pursuant to the provisions described under Item 20 above, or otherwise, the
Company 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 Company 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 Company 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.
 
     The undersigned registrant hereby undertakes to respond to requests for
information that is incorporated by reference into the Prospectus pursuant to
Item 4, 10(b), 11, or 13 of this form, within one business day of receipt of
such request, and to send the incorporated documents by first class mail or
other equally prompt means. This includes information contained in documents
filed subsequent to the effective date of the Registration Statement through the
date of responding to the request.
 
     The undersigned registrant hereby undertakes to supply by means of a
post-effective amendment all information concerning a transaction, and the
company being acquired involved therein, that was not the subject of and
included in the Registration Statement when it became effective.
 
                                      II-5
<PAGE>   71
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Registration Statement or Amendment to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of Houston,
the State of Texas, on November 12, 1997.
    
 
                                            CLIFFS DRILLING COMPANY
 
                                            By: /s/  DOUGLAS E. SWANSON
                                            ------------------------------------
                                                     Douglas E. Swanson
                                             Chairman of the Board, President,
                                                and Chief Executive Officer
 
     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement or Amendment has been signed by the following persons in
the capacities and on the dates indicated.
 
   
<TABLE>
<CAPTION>
                      SIGNATURE                                        TITLE                         DATE
                      ---------                                        -----                         ----
<C>                                                    <S>                                    <C>
 
            /s/  DOUGLAS E. SWANSON                    Chairman of the Board, President and   November 12, 1997
- -----------------------------------------------------    Chief Executive Officer (Principal
                 Douglas E. Swanson                      Executive Officer)
 
                          *                            Director                               November 12, 1997
- -----------------------------------------------------
                     M. M. Cone
 
                          *                            Director                               November 12, 1997
- -----------------------------------------------------
                  H. Robert Hirsch
 
                          *                            Director                               November 12, 1997
- -----------------------------------------------------
                  Donald W. Keller
 
                          *                            Director                               November 12, 1997
- -----------------------------------------------------
                  Robert M. McInnes
 
                          *                            Director                               November 12, 1997
- -----------------------------------------------------
                   Joseph E. Reid
 
                          *                            Director                               November 12, 1997
- -----------------------------------------------------
                    John D. Weil
 
             /s/  EDWARD A. GUTHRIE                    Vice President -- Finance and Chief    November 12, 1997
- -----------------------------------------------------    Financial Officer (Principal
                  Edward A. Guthrie                      Financial Officer)
 
              /s/  CINDY B. TAYLOR                     Vice President -- Controller           November 12, 1997
- -----------------------------------------------------    (Principal Accounting Officer)
                   Cindy B. Taylor
 
*By:           /s/ EDWARD A. GUTHRIE
      ---------------------------------------------
                   Edward A. Guthrie
                   Attorney-in-Fact
                                                      
</TABLE>
    
 
                                      II-6
<PAGE>   72
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Registration Statement or Amendment to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of Houston,
the State of Texas, on November 12, 1997.
    
 
                                          SOUTHWESTERN OFFSHORE CORPORATION
                                          (f/k/a Cliffs Drilling Asset
                                          Acquisition Company)
 
                                          By:  /s/  CHARLES M. McCALL
                                          --------------------------------------
                                                    Charles M. McCall
                                                        President
 
     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement or Amendment has been signed by the following persons in
the capacities and on the dates indicated.
 
   
<TABLE>
<CAPTION>
                      SIGNATURE                                      TITLE                         DATE
                      ---------                                      -----                         ----
<C>                                                    <S>                                 <C>
 
            /s/  DOUGLAS E. SWANSON                    Chairman of the Board                November 12, 1997
- -----------------------------------------------------
                 Douglas E. Swanson
 
             /s/  CHARLES M. McCALL                    Director and President (Principal    November 12, 1997
- -----------------------------------------------------    Executive Officer)
                  Charles M. McCall

                /s/  JIM R. WISE                       Executive Vice President --          November 12, 1997
- -----------------------------------------------------    Operations
                     Jim R. Wise
 
             /s/  EDWARD A. GUTHRIE                    Director, Vice President --          November 12, 1997
- -----------------------------------------------------    Finance and Secretary (Principal
                  Edward A. Guthrie                      Financial Officer and Principal
                                                         Accounting Officer)
</TABLE>
    
 
                                      II-7
<PAGE>   73
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Registration Statement or Amendment to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of Houston,
the State of Texas, on November 12, 1997.
    
 
                                            CLIFFS DRILLING MERGER COMPANY
 
                                            By: /s/  DOUGLAS E. SWANSON
                                            ------------------------------------
                                                     Douglas E. Swanson
                                                         President
 
     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement or Amendment has been signed by the following persons in
the capacities and on the dates indicated.
 
   
<TABLE>
<CAPTION>
                      SIGNATURE                                   TITLE                     DATE
                      ---------                                   -----                     ----
<C>                                                    <S>                           <C>
 
            /s/  DOUGLAS E. SWANSON                    Director and President        November 12, 1997
- -----------------------------------------------------    (Principal Executive
                 Douglas E. Swanson                      Officer)
 
             /s/  EDWARD A. GUTHRIE                    Director and Vice President   November 12, 1997
- -----------------------------------------------------    (Principal Financial
                  Edward A. Guthrie                      Officer)

              /s/  CINDY B. TAYLOR                     Controller (Principal         November 12, 1997
- -----------------------------------------------------    Accounting Officer)
                   Cindy B. Taylor
</TABLE>
    
 
                                      II-8
<PAGE>   74
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Registration Statement or Amendment to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of Houston,
the State of Texas, on November 12, 1997.
    
 
                                            CLIFFS DRILLING INTERNATIONAL, INC.
 
                                            By: /s/  DOUGLAS E. SWANSON
                                            ------------------------------------
                                                     Douglas E. Swanson
                                                         President
 
     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement or Amendment has been signed by the following persons in
the capacities and on the dates indicated.
 
   
<TABLE>
<CAPTION>
                      SIGNATURE                                   TITLE                    DATE
                      ---------                                   -----                    ----
<C>                                                    <S>                           <C>
 
            /s/  DOUGLAS E. SWANSON                    Director and President        November 12, 1997
- -----------------------------------------------------    (Principal Executive
                 Douglas E. Swanson                      Officer)
 
             /s/  EDWARD A. GUTHRIE                    Director and Vice             November 12, 1997
- -----------------------------------------------------    President -- Finance
                  Edward A. Guthrie                      (Principal Financial
                                                         Officer)
 
              /s/  CINDY B. TAYLOR                     Controller (Principal         November 12, 1997
- -----------------------------------------------------    Accounting Officer)
                   Cindy B. Taylor
</TABLE>
    
 
                                      II-9
<PAGE>   75
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Registration Statement or Amendment to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of Houston,
the State of Texas, on November 12, 1997.
    
 
                                            CLIFFS OIL AND GAS COMPANY
 
                                            By: /s/  DOUGLAS E. SWANSON
                                            ------------------------------------
                                                     Douglas E. Swanson
                                                         President
 
     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement or Amendment has been signed by the following persons in
the capacities and on the dates indicated.
 
   
<TABLE>
<CAPTION>
                      SIGNATURE                                        TITLE                         DATE
                      ---------                                        -----                         ----
<C>                                                    <S>                                    <C>
 
            /s/  DOUGLAS E. SWANSON                    Director and President (Principal      November 12, 1997
- -----------------------------------------------------    Executive Officer)
                 Douglas E. Swanson
 
             /s/  EDWARD A. GUTHRIE                    Director and Vice President --         November 12, 1997
- -----------------------------------------------------    Finance (Principal Financial
                  Edward A. Guthrie                      Officer)
 
              /s/  CINDY B. TAYLOR                     Controller (Principal Accounting       November 12, 1997
- -----------------------------------------------------    Officer)
                   Cindy B. Taylor
</TABLE>
    
 
                                      II-10
<PAGE>   76
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Registration Statement or Amendment to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of Houston,
the State of Texas, on November 12, 1997.
    
 
                                            DRL, INC.
 
                                            By: /s/  DOUGLAS E. SWANSON
                                            ------------------------------------
                                                     Douglas E. Swanson
                                                         President
 
     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement or Amendment has been signed by the following persons in
the capacities and on the dates indicated.
 
   
<TABLE>
<CAPTION>
                      SIGNATURE                                        TITLE                         DATE
                      ---------                                        -----                         ----
<C>                                                    <S>                                    <C>
 
            /s/  DOUGLAS E. SWANSON                    Director and President (Principal      November 12, 1997
- -----------------------------------------------------    Executive Officer)
                 Douglas E. Swanson
 
             /s/  EDWARD A. GUTHRIE                    Director and Vice President            November 12, 1997
- -----------------------------------------------------    (Principal Financial Officer)
                  Edward A. Guthrie
 
              /s/  CINDY B. TAYLOR                     Controller (Principal Accounting       November 12, 1997
- -----------------------------------------------------    Officer)
                   Cindy B. Taylor
</TABLE>
    
 
                                      II-11
<PAGE>   77
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Registration Statement or Amendment to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of Houston,
the State of Texas, on November 12, 1997.
    
 
                                            CLIFFS DRILLING TRINIDAD LIMITED
 
                                            By:     /s/  JIM R. WISE
 
                                            ------------------------------------
                                                        Jim R. Wise
                                                     Managing Director
 
     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement or Amendment has been signed by the following persons in
the capacities and on the dates indicated.
 
   
<TABLE>
<CAPTION>
                      SIGNATURE                                        TITLE                         DATE
                      ---------                                        -----                         ----
<C>                                                    <S>                                    <C>
 
                   /s/ JIM R. WISE                     Managing Director (Principal           November 12, 1997
- -----------------------------------------------------    Executive Officer)
                     Jim R. Wise
 
                 /s/  DOUGLAS E. SWANSON               Director                               November 12, 1997
- -----------------------------------------------------
                 Douglas E. Swanson
 
                  /s/  EDWARD A. GUTHRIE               Director and Vice President            November 12, 1997
- -----------------------------------------------------    (Principal Financial Officer and
                  Edward A. Guthrie                      Principal Accounting Officer)
</TABLE>
    
 
                                      II-12
<PAGE>   78
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Registration Statement or Amendment to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of Houston,
the State of Texas, on November 12, 1997.
    
 
                                            WEST INDIES DRILLING JOINT VENTURE
                                            By: CLIFFS DRILLING TRINIDAD
                                                LIMITED,
                                              Partner and Firm Manager
 
                                            By:     /s/  JIM R. WISE
 
                                            ------------------------------------
                                                        Jim R. Wise
                                                     Managing Director
 
     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement or Amendment has been signed by the following persons in
the capacities and on the dates indicated.
 
   
<TABLE>
<CAPTION>
                      SIGNATURE                                        TITLE                         DATE
                      ---------                                        -----                         ----
<C>                                                    <S>                                    <C>
 
                   /s/ JIM R. WISE                     Managing Director (Principal           November 12, 1997
- -----------------------------------------------------    Executive Officer) of Cliffs
                     Jim R. Wise                         Drilling Trinidad Limited, Firm
                                                         Manager
 
                 /s/  DOUGLAS E. SWANSON               Director of Cliffs Drilling Trinidad   November 12, 1997
- -----------------------------------------------------    Limited, Firm Manager
                 Douglas E. Swanson
 
                  /s/  EDWARD A. GUTHRIE               Director and Vice President of Cliffs  November 12, 1997
- -----------------------------------------------------    Drilling Trinidad Limited, Firm
                  Edward A. Guthrie                      Manager (Principal Financial
                                                         Officer and Principal Accounting
                                                         Officer)
</TABLE>
    
 
                                      II-13
<PAGE>   79
 
                               INDEX TO EXHIBITS
 
<TABLE>
<CAPTION>
      EXHIBIT NO.                                  EXHIBIT
      -----------                                  -------
<S>                      <C>
           2.1           -- Reorganization and Distribution Agreement dated as of
                            June 8, 1988 among Cleveland-Cliffs Inc, The
                            Cleveland-Cliffs Iron Company, Cliffs Drilling Company,
                            now Cliffs Resources, Inc., Cliffs Exploration Company,
                            now Cliffs Oil and Gas Company, Cliffs Drilling
                            International, Inc. and New Cliffs Drilling Company, now
                            Cliffs Drilling Company, the Registrant (the "Company")
                            (incorporated by reference to Exhibit 2.1 to the
                            Company's Registration Statement on Form S-1, No.
                            33-23508, filed under the Securities Act).
           2.2           -- Acquisition Agreement dated as of May 13, 1996 by and
                            among Southwestern Offshore Corporation, Viking Supply
                            Ships A.S., Ocean Master III Inc., Production Partner
                            Inc., Trivium Investments Limited, Helge Ringdal and the
                            Company, Cliffs Drilling Asset Acquisition Company and
                            Cliffs Drilling Merger Company (incorporated by reference
                            to Exhibit 2.2 to the Company's Current Report on Form
                            8-K dated May 23, 1996).
           3.1.1         -- Certificate of Incorporation of New Cliffs Drilling
                            Company (incorporated by reference to Exhibit 3.1.1 to
                            the Company's Quarterly Report on Form 10-Q for the
                            quarter ended June 30, 1997).
           3.1.2         -- Certificate of Amendment of Certificate of Incorporation
                            (incorporated by reference to Exhibit 3.1.2 to the
                            Company's Quarterly Report on Form 10-Q for the quarter
                            ended June 30, 1997).
           3.1.3         -- Certificate of Designations of $2.3125 Convertible
                            Exchangeable Preferred Stock of Cliffs Drilling Company
                            (incorporated by reference to Exhibit 3.1.3 to the
                            Company's Quarterly Report on Form 10-Q for the quarter
                            ended June 30, 1997).
           3.1.4         -- Certificate of Amendment of Certificate of Incorporation
                            of Cliffs Drilling Company (incorporated by reference to
                            Exhibit 3.1.4 to the Company's Quarterly Report on Form
                            10-Q for the quarter ended June 30, 1997).
           3.1.5         -- Certificate of Elimination of $2.3125 Convertible
                            Exchangeable Preferred Stock of Cliffs Drilling Company
                            (incorporated by reference to Exhibit 3.1.5 to the
                            Company's Quarterly Report on Form 10-Q for the quarter
                            ended June 30, 1997).
           3.1.6         -- Certificate of Designations of Series A Junior
                            Participating Preferred Stock of Cliffs Drilling Company
                            (incorporated by reference to Exhibit 3.1.6 to the
                            Company's Quarterly Report on Form 10-Q for the quarter
                            ended June 30, 1997).
           4.1           -- Certificate of Incorporation of Cliffs Drilling Company
                            (included as Exhibits 3.1.1, 3.1.2, 3.1.3, 3.1.4, 3.1.5
                            and 3.1.6).
           4.2           -- By-Laws of the Company (incorporated by reference to
                            Exhibit 3.2 to the Company's Registration Statement on
                            Form S-1, No. 33-23508, filed under the Securities Act).
           4.3           -- Indenture dated as of May 15, 1996 among the Company, as
                            issuer, Cliffs Drilling Asset Acquisition Company, Cliffs
                            Drilling Merger Company, Cliffs Drilling International,
                            Inc. and Cliffs Oil and Gas Company, as subsidiary
                            guarantors, and Fleet National Bank, predecessor of State
                            Street Bank and Trust Company, as trustee, including a
                            Form of the Company's 10.25% Senior Notes due 2003
                            (incorporated by reference to Exhibit 4.3 to the
                            Company's Current Report on Form 8-K dated May 23, 1996).
           4.3.1         -- First Supplemental Indenture dated as of July 11, 1996
                            among the Company, as issuer, Southwestern Offshore
                            Corporation (f/k/a Cliffs Drilling Asset Acquisition
                            Company), Cliffs Drilling Merger Company, Cliffs Drilling
                            International, Inc., Cliffs Oil and Gas Company, and DRL,
                            Inc., as subsidiary guarantors, and Fleet National Bank,
                            predecessor of State Street Bank and Trust Company, as
                            trustee (incorporated by reference to Exhibit 4.3.1 to
                            the Company's Registration Statement on Form S-4, No.
                            333-08273 filed July 17, 1996).
</TABLE>
<PAGE>   80
<TABLE>
<CAPTION>
      EXHIBIT NO.                                  EXHIBIT
      -----------                                  -------
<C>                      <S>
           4.3.2         -- Second Supplemental Indenture dated as of January 24,
                            1997 among the Company, as issuer, Southwestern Offshore
                            Corporation (f/k/a Cliffs Drilling Asset Acquisition
                            Company), Cliffs Drilling Merger Company, Cliffs Drilling
                            International, Inc., Cliffs Oil and Gas Company, DRL,
                            Inc., and Greenbay Drilling Company Ltd., as subsidiary
                            guarantors, and Fleet National Bank, predecessor of State
                            Street Bank and Trust Company, as trustee (incorporated
                            by reference to Exhibit 4.6.2 to the Company's Annual
                            Report on Form 10-K for the fiscal year ended December
                            31, 1996).
           4.3.3*        -- Third Supplemental Indenture dated as of August 29, 1997
                            among the Company, as issuer, Southwestern Offshore
                            Corporation (f/k/a Cliffs Drilling Asset Acquisition
                            Company), Cliffs Drilling Merger Company, Cliffs Drilling
                            International, Inc., Cliffs Oil and Gas Company, DRL,
                            Inc., Cliffs Drilling Trinidad Ltd. and the West Indies
                            Drilling Joint Venture, as subsidiary guarantors, and
                            State Street Bank and Trust Company, successor to Fleet
                            National Bank, as trustee.
           4.4*          -- Indenture dated as of August 7, 1997 among the Company,
                            as issuer, Southwestern Offshore Corporation, Cliffs
                            Drilling Merger Company, Cliffs Drilling International,
                            Inc., Cliffs Oil and Gas Company and DRL, Inc., as
                            subsidiary guarantors, and State Street Bank and Trust
                            Company, as trustee, including a form of the Company's
                            10.25% Senior Notes due 2003.
           4.4.1*        -- First Supplemental Indenture dated as of August 29, 1997
                            among the Company, as issuer, Southwestern Offshore
                            Corporation, Cliffs Drilling Merger Company, Cliffs
                            Drilling International, Inc., Cliffs Oil and Gas Company,
                            DRL, Inc., Cliffs Drilling Trinidad Ltd. and the West
                            Indies Drilling Joint Venture, as subsidiary guarantors,
                            and State Street Bank and Trust Company, as trustee.
           4.5*          -- Registration Rights Agreement dated as of July 31, 1997
                            by and among the Company, Southwestern Offshore
                            Corporation, Cliffs Drilling Merger Company, Cliffs
                            Drilling International, Inc., Cliffs Oil and Gas Company,
                            DRL, Inc., Jefferies & Company, Inc. and ING Baring
                            (U.S.) Securities, Inc.
           5.1*          -- Opinion of Griggs & Harrison, P.C.
          12.1*          -- Statement re Computation of Ratio of Earnings to Fixed
                            Charges.
          23.1**         -- Consent of Ernst & Young LLP.
          23.2**         -- Consent of Arthur Andersen, LLP.
          23.3*          -- Consent of Griggs & Harrison, P.C. (included in Exhibit
                            5.1).
          24.1*          -- Powers of Attorney (included on the signature pages of
                            this Registration Statement).
          25.1           -- Statement of Eligibility of Fleet National Bank,
                            predecessor of State Street Bank and Trust Company, dated
                            July 15, 1996 (incorporated by reference to Exhibit 25.1
                            to the Company's Registration Statement on Form S-4, No.
                            333-08273 filed July 17, 1996).
          25.2*          -- Statement of Eligibility of State Street Bank and Trust
                            Company dated September 22, 1997.
          99.1**         -- Form of Letter of Transmittal.
</TABLE>
 
- ---------------
 
 * Previously filed
 
** Filed herewith

<PAGE>   1
 
                                                                    EXHIBIT 23.1
 
                        CONSENT OF INDEPENDENT AUDITORS
 
   
     We consent to the reference to our firm under the captions "Experts" and
"Selected Consolidated Financial Information" in Amendment No. 3 to the
Registration Statement (Form S-4) and related Prospectus of Cliffs Drilling
Company for the registration of the Company's $50 million Senior Notes due 2003,
Series D and to the incorporation by reference therein of our report dated
February 21, 1997, with respect to the consolidated financial statements and
schedule of Cliffs Drilling Company included in its Annual Report (Form 10-K/A
(Amendment No. 3)) for the year ended December 31, 1996, filed with the
Securities and Exchange Commission.
    
 
                                            /s/ ERNST & YOUNG LLP
 
Houston, Texas
   
November 12, 1997
    

<PAGE>   1
 
                                                                    EXHIBIT 23.2
 
                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
     As independent public accountants, we hereby consent to the incorporation
by reference in this registration statement of our report dated February 16,
1996 included in Southwestern Offshore Corporation's Consolidated Financial
Statements for the year ended December 31, 1995 and to all references to our
Firm included in this registration statement.
 
/s/ ARTHUR ANDERSEN LLP
 
Houston, Texas
   
November 12, 1997
    

<PAGE>   1
 
                            CLIFFS DRILLING COMPANY
 
                             LETTER OF TRANSMITTAL
                                      FOR
        TENDER OF ALL OUTSTANDING 10.25% SENIOR NOTES DUE 2003, SERIES C
                                IN EXCHANGE FOR
                     10.25% SENIOR NOTES DUE 2003, SERIES D
 
        THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME,
         ON DECEMBER 16, 1997, UNLESS EXTENDED (THE "EXPIRATION DATE")
 
           OLD NOTES TENDERED IN THE EXCHANGE OFFER MAY BE WITHDRAWN
              AT ANY TIME PRIOR TO 5:00 P.M., NEW YORK CITY TIME,
                ON THE BUSINESS DAY PRIOR TO THE EXPIRATION DATE
 
                         DELIVER TO THE EXCHANGE AGENT:
 
                      STATE STREET BANK AND TRUST COMPANY
 
                                    By Mail:
                      State Street Bank and Trust Company
                           Corporate Trust Department
                                  P.O. Box 778
                        Boston, Massachusetts 02102-0078
                           By Hand/Overnight Courier:
                      State Street Bank and Trust Company
                           Corporate Trust Department
                                  Fourth Floor
                            Two International Place
                          Boston, Massachusetts 02110
 
                                 By Facsimile:
                                 (617) 664-5232
 
                             Confirm by Telephone:
                                 (617) 664-5314
 
                            ------------------------
 
    DELIVERY OF THIS INSTRUMENT TO AN ADDRESS OTHER THAN AS SET FORTH ABOVE OR
TRANSMISSION OF INSTRUCTIONS VIA A FACSIMILE NUMBER OTHER THAN THE ONE LISTED
ABOVE WILL NOT CONSTITUTE A VALID DELIVERY. THE INSTRUCTIONS ACCOMPANYING THIS
LETTER OF TRANSMITTAL SHOULD BE READ CAREFULLY BEFORE THIS LETTER OF TRANSMITTAL
IS COMPLETED.
 
    The undersigned hereby acknowledges receipt and review of the Prospectus
dated November 13, 1997 (the "Prospectus") of Cliffs Drilling Company, a
Delaware corporation (the "Company"), and this Letter of Transmittal (the
"Letter of Transmittal"), which together describe the Company's offer (the
"Exchange Offer") to exchange its 10.25% Senior Notes due 2003, Series D (the
"Exchange Notes"), which have been registered under the Securities Act of 1933,
as amended (the "Securities Act"), pursuant to a Registration Statement of which
the Prospectus is a part, for a like principal amount of its issued and
outstanding 10.25% Senior Notes due 2003, Series C (the "Old Notes").
Capitalized terms used but not defined herein have the respective meaning given
to them in the Prospectus.
 
    The Company reserves the right, at any time or from time to time, to extend
the Exchange Offer at its discretion, in which event the term "Expiration Date"
shall mean the latest date to which the Exchange Offer is extended. The Company
shall notify the holders of the Old Notes of any extension by oral or written
notice and will mail to the record holders of Old Notes an announcement thereof,
each prior to 9:00 A.M., New York City time, on the next business day after the
previously scheduled Expiration Date.
 
    This Letter of Transmittal is to be used by a holder of Old Notes either if
original Old Notes, if available, are to be forwarded herewith or if delivery of
Old Notes is to be made by book-entry transfer to the account maintained by the
Exchange Agent at The Depository Trust Company (the "Book-Entry Transfer
Facility") pursuant to the procedures set forth in the Prospectus under the
caption "The Exchange Offer -- Procedures for Tendering" and "Book-Entry
Transfer." Holders of Old Notes whose Old Notes are not immediately available,
or who are unable to deliver their Old Notes and all other documents required by
this Letter of Transmittal to the Exchange Agent on or prior to the Expiration
Date, or who are unable to complete the procedure for book-entry transfer on a
timely basis, must tender their Old Notes according to the guaranteed delivery
procedures set forth in the Prospectus under the caption "The Exchange
Offer -- Guaranteed Delivery Procedures." See Instruction 1. Delivery of
documents to the Book-Entry Transfer Facility does not constitute delivery to
the Exchange Agent.
 
    The term "holder" with respect to the Exchange Offer means any person in
whose name Old Notes are registered on the books of the Company or any other
person who has obtained a properly completed bond power from the registered
holder. The undersigned has completed, executed and delivered this Letter of
Transmittal to indicate the action the undersigned desires to take with respect
to the Exchange Offer. Holders who wish to tender their Old Notes must complete
this Letter of Transmittal in its entirety.
 
    PLEASE READ THE ENTIRE LETTER OF TRANSMITTAL AND THE PROSPECTUS CAREFULLY
BEFORE CHECKING ANY BOX BELOW.
 
    THE INSTRUCTIONS INCLUDED WITH THIS LETTER OF TRANSMITTAL MUST BE FOLLOWED.
QUESTIONS AND REQUESTS FOR ASSISTANCE OR FOR ADDITIONAL COPIES OF THE PROSPECTUS
AND THIS LETTER OF TRANSMITTAL MAY BE DIRECTED TO THE EXCHANGE AGENT.
 
    List below the Old Notes to which this Letter of Transmittal relates. If the
space below is inadequate, list the registered numbers and principal amounts on
a separate signed schedule and affix the list to this Letter of Transmittal.
<PAGE>   2
<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------
                                           DESCRIPTION OF OLD NOTES TENDERED
- -----------------------------------------------------------------------------------------------------------------------
   NAME(S) AND ADDRESS(ES) OF REGISTERED
        HOLDER(S) EXACTLY AS NAME(S)
           APPEAR(S) ON OLD NOTES
         (PLEASE FILL IN, IF BLANK)                                     OLD NOTE(S) TENDERED
- -----------------------------------------------------------------------------------------------------------------------
                                                                        AGGREGATE PRINCIPAL           PRINCIPAL
                                                    REGISTERED         AMOUNT REPRESENTED BY            AMOUNT
                                                    NUMBER(S)*                NOTE(S)                 TENDERED**
- -----------------------------------------------------------------------------------------------------------------------
<S>                                          <C>                      <C>                      <C>

- -----------------------------------------------------------------------------------------------------------------------

- -----------------------------------------------------------------------------------------------------------------------

- -----------------------------------------------------------------------------------------------------------------------

- -----------------------------------------------------------------------------------------------------------------------

- -----------------------------------------------------------------------------------------------------------------------
   * Need not be completed by book-entry holders.
  ** Unless otherwise indicated, any tendering holder of Old Notes will be deemed to have tendered the entire aggregate
     principal amount represented by such Old Notes. All tenders must be in integral multiples of $1,000.
- -----------------------------------------------------------------------------------------------------------------------
</TABLE>
 
[ ] CHECK HERE IF TENDERED OLD NOTES ARE ENCLOSED HEREWITH.
 
[ ] CHECK HERE IF TENDERED OLD NOTES ARE BEING DELIVERED BY BOOK-ENTRY TRANSFER
    MADE TO THE ACCOUNT MAINTAINED BY THE EXCHANGE AGENT WITH THE BOOK-ENTRY
    TRANSFER FACILITY AND COMPLETE THE FOLLOWING (FOR USE BY ELIGIBLE
    INSTITUTIONS ONLY):
 
Name of Tendering Institution:..................................................
 
Account Number:.................................................................
 
Transaction Code Number:........................................................
 
[ ] CHECK HERE IF TENDERED OLD NOTES ARE BEING DELIVERED PURSUANT TO A NOTICE OF
    GUARANTEED DELIVERY ENCLOSED HEREWITH AND COMPLETE THE FOLLOWING (FOR USE BY
    ELIGIBLE INSTITUTIONS ONLY):
 
Name(s) of Registered holder(s) of Old Notes:...................................
 
Date of Execution of Notice of Guaranteed Delivery:.............................
 
Window Ticket Number (if available):............................................
 
Name of Eligible Institution that Guaranteed Delivery:..........................
 
Account Number (if delivered by book-entry transfer):...........................
 
[ ] CHECK HERE IF YOU ARE A BROKER-DEALER AND WISH TO RECEIVE 10 ADDITIONAL
    COPIES OF THE PROSPECTUS AND 10 COPIES OF ANY AMENDMENTS OR SUPPLEMENTS
    THERETO:
 
Name:...........................................................................
 
Address:........................................................................
<PAGE>   3
 
                       SIGNATURES MUST BE PROVIDED BELOW
              PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY
 
Ladies and Gentlemen:
 
    Subject to the terms and conditions of the Exchange Offer, the undersigned
hereby tenders to the Company for exchange the principal amount of Old Notes
indicated above. Subject to and effective upon the acceptance for exchange of
the principal amount of Old Notes tendered in accordance with this Letter of
Transmittal, the undersigned hereby exchanges, assigns and transfers to the
Company all right, title and interest in and to the Old Notes tendered for
exchange hereby. The undersigned hereby irrevocably constitutes and appoints the
Exchange Agent, the agent and attorney-in-fact of the undersigned (with full
knowledge that the Exchange Agent also acts as the agent of the Company in
connection with the Exchange Offer) with respect to the tendered Old Notes with
full power of substitution to (i) deliver such Old Notes, or transfer ownership
of such Old Notes on the account books maintained by the Book-Entry Transfer
Facility, to the Company and deliver all accompanying evidences of transfer and
authenticity, and (ii) present such Old Notes for transfer on the books of the
Company and receive all benefits and otherwise exercise all rights of beneficial
ownership of such Old Notes, all in accordance with the terms of the Exchange
Offer. The power of attorney granted in this paragraph shall be deemed to be
irrevocable and coupled with an interest.
 
    The undersigned hereby represents and warrants that the undersigned has full
power and authority to tender, exchange, assign and transfer the Old Notes
tendered hereby and to acquire the Exchange Notes issuable upon the exchange of
such tendered Old Notes, and that the Company will acquire good and unencumbered
title thereto, free and clear of all liens, restrictions, charges and
encumbrances and not subject to any adverse claim, when the same are accepted
for exchange by the Company.
 
    The undersigned acknowledge(s) that this Exchange Offer is being made in
reliance upon interpretations contained in no-action letters issued to third
parties by the staff of the Securities and Exchange Commission (the "SEC"),
including Exxon Capital Holdings Corporation, SEC No-Action Letter (available
April 13, 1989), Morgan Stanley & Co. Inc., SEC No-Action Letter (available June
5, 1991) (the "Morgan Stanley Letter") and Mary Kay Cosmetics, Inc., SEC
No-Action Letter (available June 5, 1991), that the Exchange Notes issued in
exchange for the Old Notes pursuant to the Exchange Offer may be offered for
resale, resold and otherwise transferred by holders thereof (other than (i) a
broker-dealer who purchased Old Notes exchanged for such Exchange Notes directly
from the Company to resell pursuant to Rule 144A or any other available
exemption under the Securities Act or (ii) any such holder that is an
"affiliate" of the Company within the meaning of Rule 405 under the Securities
Act), without compliance with the registration and prospectus delivery
provisions of the Securities Act, provided that such Exchange Notes are acquired
in the ordinary course of such holders' business and such holders are not
participating in, and have no arrangement with any person to participate in, the
distribution of such Exchange Notes. The undersigned specifically represent(s)
to the Company that (i) any Exchange Notes acquired in exchange for Old Notes
tendered hereby are being acquired in the ordinary course of business of the
person receiving such Exchange Notes, whether or not the undersigned, (ii) the
undersigned is not participating in, and has no arrangement with any person to
participate in, the distribution of Exchange Notes, and (iii) neither the
undersigned nor any such other person is an "affiliate" (as defined in Rule 405
under the Securities Act) of the Company or a broker-dealer tendering Old Notes
acquired directly from the Company for its own account.
 
    If the undersigned or the person receiving the Exchange Notes is a
broker-dealer that is receiving Exchange Notes for its own account pursuant to
the Exchange Offer, the undersigned acknowledges that it or such other person
will deliver a prospectus in connection with any resale of such Exchange Notes.
The undersigned acknowledges that if the undersigned is participating in the
Exchange Offer for the purpose of distributing the Exchange Notes (i) the
undersigned cannot rely on the position of the staff of the SEC in the Morgan
Stanley Letter and similar SEC no-action letters, and, in the absence of an
exemption therefrom, must comply with the registration and prospectus delivery
requirements of the Securities Act in connection with a secondary resale
transaction of the Exchange Notes, in which case the registration statement must
contain the selling security holder information required by Item 507 or Item
508, as applicable, of Regulation S-K of the SEC, and (ii) a broker-dealer that
delivers such a prospectus to purchasers in connection with such resales will be
subject to certain of the civil liability provisions under the Securities Act
and will be bound by the provisions of the Registration Rights Agreement
(including certain indemnification rights and obligations).
 
    The undersigned will, upon request, execute and deliver any additional
documents deemed by the Exchange Agent or the Company to be necessary or
desirable to complete the exchange, assignment and transfer of the Old Notes
tendered hereby, including the transfer of such Old Notes on the account books
maintained by the Book-Entry Transfer Facility.
 
    For purposes of the Exchange Offer, the Company shall be deemed to have
accepted for exchange validly tendered Old Notes when, as and if the Company
gives oral or written notice thereof to the Exchange Agent. Any tendered Old
Notes that are not accepted for exchange pursuant to the Exchange Offer for any
reason will be returned, without expense, to the undersigned at the address
shown below or at a different address as may be indicated herein under "Special
Delivery Instructions" as promptly as practicable after the Expiration Date.
 
    All authority conferred or agreed to be conferred by this Letter of
Transmittal shall survive the death, incapacity or dissolution of the
undersigned, and every obligation of the undersigned under this Letter of
Transmittal shall be binding upon the undersigned's heirs, personal
representatives, successors and assigns.
 
    The undersigned acknowledges that the Company's acceptance of properly
tendered Old Notes pursuant to the procedures described under the caption "The
Exchange Offer--Procedures for Tendering" in the Prospectus and in the
instructions hereto will constitute a binding agreement between the undersigned
and the Company upon the terms and subject to the conditions of the Exchange
Offer.
 
    Unless otherwise indicated under "Special Issuance Instructions," please
issue the Exchange Notes issued in exchange for the Old Notes accepted for
exchange and return any Old Notes not tendered or not exchanged, in the name(s)
of the undersigned. Similarly, unless otherwise indicated under "Special
Delivery Instructions," please mail or deliver the Exchange Notes issued in
exchange for the Old Notes accepted for exchange and any Old Notes not tendered
or not exchanged (and accompanying documents, as appropriate) to the undersigned
at the address shown below the undersigned's signature(s). In the event that
both "Special Issuance Instructions" and "Special Delivery Instructions" are
completed, please issue the Exchange Notes issued in exchange for the Old Notes
accepted for exchange in the name(s) of, and return any Old Notes not tendered
or not exchanged to, the person(s) so indicated. The undersigned recognizes that
the Company has no obligation pursuant to the "Special Issuance Instructions"
and "Special Delivery Instructions" to transfer any Old Notes from the name of
the registered holder(s) thereof if the Company does not accept for exchange any
of the Old Notes so tendered for exchange.
<PAGE>   4
                         SPECIAL ISSUANCE INSTRUCTIONS
                           (SEE INSTRUCTIONS 5 AND 6)
 
     To be completed ONLY (i) if Old Notes in a principal amount not tendered,
 or Exchange Notes issued in exchange for Old Notes accepted for exchange, are
 to be issued in the name of someone other than the undersigned, or (ii) if Old
 Notes tendered by book-entry transfer which are not exchanged are to be
 returned by credit to an account maintained at the Book-Entry Transfer
 Facility. Issue Exchange Notes and/or Old Notes to:
 
 Name:
 ..............................................................................
 
                             (Please Type or Print)
 ..............................................................................
 
 Address:......................................................................

 ..............................................................................
 
                               (include Zip Code)
 ..............................................................................
                  (Tax Identification or Social Security No.)
 
                         (Complete Substitute Form W-9)
 
                         SPECIAL DELIVERY INSTRUCTIONS
                           (SEE INSTRUCTIONS 5 AND 6)
 
 To be completed ONLY if Old Notes in the principal amount not tendered, or
 Exchange Notes issued in exchange for Old Notes accepted for exchange, are to
 be mailed or delivered to someone other than the undersigned, or to the
 undersigned at an address other than that shown below the undersigned's
 signature.
 
 Mail or deliver Exchange Notes and/or Old Notes to:
 
 Name:
 ..............................................................................
 
                             (Please Type or Print)
 ..............................................................................
 
 Address:......................................................................

 ..............................................................................
 
                               (include Zip Code)
 ..............................................................................
                  (Tax Identification or Social Security No.)
 
[ ]  Credit unexchanged Old Notes delivered by book-entry transfer to the
     Book-Entry Transfer Facility set forth below:
 
Book-Entry Transfer Facility Account Number:
<PAGE>   5
          ------------------------------------------------------------
 
                                   IMPORTANT
                        PLEASE SIGN HERE WHETHER OR NOT
                 OLD NOTES ARE BEING PHYSICALLY TENDERED HEREBY
          (Complete Accompanying Substitute Form W-9 on Reverse Side)
 
          X...........................................................
 
          X...........................................................
 
               (Signature(s) of Registered Holders of Old Notes)
 
                   Dated:......................................., 1997
 
          (The above lines must be signed by the registered holder(s)
          of Old Notes as name(s) appear(s) on the Old Notes or on a
          security position listing, or by person(s) authorized to
          become registered holder(s) by a properly completed bond
          power from the registered holder(s), a copy of which must be
          transmitted with this Letter of Transmittal. If Old Notes to
          which this Letter of Transmittal relate are held of record
          by two or more joint holders, then all such holders must
          sign this Letter of Transmittal. If signature is by a
          trustee, executor, administrator, guardian,
          attorney-in-fact, officer of a corporation or other person
          acting in a fiduciary or representative capacity, then such
          person must (i) set forth his or her full title below and
          (ii) unless waived by the Company, submit evidence
          satisfactory to the Company of such person's authority so to
          act. See Instruction 5 regarding the completion of this
          Letter of Transmittal, printed below.)
 
          Name(s):....................................................
                             (Please Type or Print)

          Capacity:...................................................

          Address:....................................................

          ............................................................
                               (Include Zip Code)
 
          Area Code and Telephone Number:.............................
 
          ------------------------------------------------------------
 
          ------------------------------------------------------------
 
                         MEDALLION SIGNATURE GUARANTEE
                         (If Required by Instruction 5)
 
          Certain signatures must be Guaranteed by an Eligible
          Institution.
 
          Signature(s) Guaranteed by an Eligible Institution:.........
                                                (Authorized Signature)
 
          ............................................................

 
          ............................................................
                                 (Name of Firm)
 
          ............................................................
                          (Address, Include Zip Code)
 
          ............................................................
                        (Area Code and Telephone Number)
 
          Dated:................................................, 1997
 
          ------------------------------------------------------------
<PAGE>   6
 
                                  INSTRUCTIONS
 
     FORMING PART OF THE TERMS AND CONDITIONS OF THE EXCHANGE OFFER
 
     1. Delivery of this Letter of Transmittal and Old Notes or Book-Entry
Confirmations. All physically delivered Old Notes or any confirmation of a
book-entry transfer to the Exchange Agent's account at the Book-Entry Transfer
Facility of Old Notes tendered by book-entry transfer (a "Book-Entry
Confirmation"), as well as a properly completed and duly executed copy of this
Letter of Transmittal or facsimile hereof, and any other documents required by
this Letter of Transmittal, must be received by the Exchange Agent at its
address set forth herein prior to 5:00 p.m., New York City time, on the
Expiration Date. The method of delivery of the tendered Old Notes, this Letter
of Transmittal and all other required documents to the Exchange Agent is at the
election and risk of the holder and, except as otherwise provided below, the
delivery will be deemed made only when actually received or confirmed by the
Exchange Agent. Instead of delivery by mail, it is recommended that the holder
use an overnight or hand delivery service. In all cases, sufficient time should
be allowed to assure delivery to the Exchange Agent before the Expiration Date.
No Letter of Transmittal or Old Notes should be sent to the Company.
 
     2. Guaranteed Delivery Procedures. Holders who wish to tender their Old
Notes and whose Old Notes are not immediately available or who cannot deliver
their Old Notes, this Letter of Transmittal or any other documents required
hereby to the Exchange Agent prior to the Expiration Date or who cannot complete
the procedure for book-entry transfer on a timely basis, must tender their Old
Notes according to the guaranteed delivery procedures set forth in the
Prospectus. Pursuant to such procedures: (i) such tender must be made by or
through a firm which is a member of a registered national securities exchange or
of the National Association of Securities Dealers Inc., a commercial bank or a
trust company having an office or correspondent in the United States or an
"eligible guarantor institution" within the meaning of Rule 17Ad-15 under the
Exchange Act (an "Eligible Institution"); (ii) prior to the Expiration Date, the
Exchange Agent must have received from the Eligible Institution a properly
completed and duly executed Notice of Guaranteed Delivery (by facsimile
transmission, mail or hand delivery) setting forth the name and address of the
holder of the Old Notes, the registration number(s) of such Old Notes and the
total principal amount of Old Notes tendered, stating that the tender is being
made thereby and guaranteeing that, within five business days after the
Expiration Date, this Letter of Transmittal (or facsimile hereof) together with
the Old Notes in proper form for transfer (or a Book-Entry Confirmation) and any
other documents required hereby, must be deposited by the Eligible Institution
with the Exchange Agent; and (iii) the certificates for all physically tendered
shares of Old Notes, in proper form for transfer (or Book-Entry Confirmation, as
the case may be) and all other documents required hereby are received by the
Exchange Agent within five business days after the Expiration Date.
 
     Any holder of Old Notes who wishes to tender Old Notes pursuant to the
guaranteed delivery procedures described above must ensure that the Exchange
Agent receives the Notice of Guaranteed Delivery prior to 5:00 p.m., New York
City time, on the Expiration Date. Upon request of the Exchange Agent, a Notice
of Guaranteed Delivery will be sent to holders who wish to tender their Old
Notes according to the guaranteed delivery procedures set forth above.
 
     See "The Exchange Offer -- Guaranteed Delivery Procedures" section of the
Prospectus.
 
     3. Tender by Holder. Only a holder of Old Notes may tender such Old Notes
in the Exchange Offer. Any beneficial holder of Old Notes who is not the
registered holder and who wishes to tender should arrange with the registered
holder to execute and deliver this Letter of Transmittal on his behalf or must,
prior to completing and executing this Letter of Transmittal and delivering his
Old Notes, either make appropriate arrangements to register ownership of the Old
Notes in such holder's name or obtain a properly completed bond power from the
registered holder.
 
     4. Partial Tenders. Tenders of Old Notes will be accepted only in integral
multiples of $1,000. If less than the entire principal amount of any Old Notes
is tendered, the tendering holder should fill in the principal amount tendered
in the third column of the box entitled "Description of Old Notes Tendered"
above. The entire principal amount of Old Notes delivered to the Exchange Agent
will be deemed to have been tendered unless otherwise indicated. If the entire
principal amount of all Old Notes is not tendered, then Old Notes for the
principal amount of Old Notes not tendered and Exchange Notes issued in exchange
for any Old Notes accepted will be sent to the holder at his or her registered
address, unless a different address is provided in the appropriate box on this
Letter of Transmittal, promptly after the Old Notes are accepted for exchange.
 
     5. Signatures on this Letter of Transmittal; Bond Powers and Endorsements;
Medallion Guarantee of Signatures. If this Letter of Transmittal (or facsimile
hereof) is signed by the record holder(s) of the Old Notes tendered hereby, the
signature must correspond with the name(s) as written on the face of the Old
Notes without alteration, enlargement or any change whatsoever. If this Letter
of Transmittal (or facsimile hereof) is signed by a participant in the
Book-Entry Transfer Facility, the signature must correspond with the name as it
appears on the security position listing as the holder of the Old Notes.
 
     If this Letter of Transmittal (or facsimile hereof) is signed by the
registered holder or holders of Old Notes listed and tendered hereby and the
Exchange Notes issued in exchange therefor are to be issued (or any untendered
principal amount of Old Notes is to be reissued) to the registered holder, the
said holder need not and should not endorse any
<PAGE>   7
 
tendered Old Notes, nor provide a separate bond power. In any other case, such
holder must either properly endorse the Old Notes tendered or transmit a
properly completed separate bond power with this Letter of Transmittal, with the
signatures on the endorsement or bond power guaranteed by an Eligible
Institution.
 
     If this Letter of Transmittal (or facsimile hereof) is signed by a person
other than the registered holder or holders of any Old Notes listed, such Old
Notes must be endorsed or accompanied by appropriate bond powers, in each case
signed as the name of the registered holder or holders appears on the Old Notes.
 
     If this Letter of Transmittal (or facsimile hereof) or any Old Notes or
bond powers are signed by trustees, executors, administrators, guardians,
attorneys-in-fact, officers of corporations or others acting in a fiduciary or
representative capacity, such persons should so indicate when signing, and,
unless waived by the Company, evidence satisfactory to the Company of their
authority to act must be submitted with this Letter of Transmittal.
 
     Endorsements on Old Notes or signatures on bond powers required by this
Instruction 5 must be guaranteed by an Eligible Institution.
 
     No signature guarantee is required if (i) this Letter of Transmittal (or
facsimile hereof) is signed by the registered holder(s) of the Old Notes
tendered herein (or by a participant in the Book-Entry Transfer Facility whose
name appears on a security position listing as the owner of the tendered Old
Notes) and the Exchange Notes are to be issued directly to such registered
holder(s) (or, if signed by a participant in the Book-Entry Transfer Facility,
deposited to such participant's account at such Book-Entry Transfer Facility)
and neither the box entitled "Special Delivery Instructions" nor the box
entitled "Special Registration Instructions" has been completed, or (ii) such
Old Notes are tendered for the account of an Eligible Institution. In all other
cases, all signatures on this Letter of Transmittal (or facsimile hereof) must
be guaranteed by an Eligible Institution.
 
     6. Special Registration and Delivery Instructions. Tendering holders should
indicate, in the applicable box or boxes, the name and address (or account at
the Book-Entry Transfer Facility) to which Exchange Notes or substitute Old
Notes for principal amounts not tendered or not accepted for exchange are to be
issued or sent, if different from the name and address of the person signing
this Letter of Transmittal. In the case of issuance in a different name, the
taxpayer identification or social security number of the person named must also
be indicated.
 
     7. Transfer Taxes. The Company will pay all transfer taxes, if any,
applicable to the exchange of Old Notes pursuant to the Exchange Offer. If,
however, Exchange Notes or Old Notes for principal amounts not tendered or
accepted for exchange are to be delivered to, or are to be registered or issued
in the name of, any person other than the registered holder of the Old Notes
tendered hereby, or if tendered Old Notes are registered in the name of any
person other than the person signing this Letter of Transmittal, or if a
transfer tax is imposed for any reason other than the exchange of Old Notes
pursuant to the Exchange Offer, then the amount of any such transfer taxes
(whether imposed on the registered holder or any other persons) will be payable
by the tendering holder. If satisfactory evidence of payment of such taxes or
exemption therefrom is not submitted with this Letter of Transmittal, the amount
of such transfer taxes will be billed directly to such tendering holder.
 
     EXCEPT AS PROVIDED IN THIS INSTRUCTION 7, IT WILL NOT BE NECESSARY FOR
TRANSFER TAX STAMPS TO BE AFFIXED TO THE OLD NOTES LISTED IN THIS LETTER OF
TRANSMITTAL.
 
     8. Tax Identification Number. Federal income tax law requires that a holder
of any Old Notes which are accepted for exchange must provide the Company (as
payor) with its correct taxpayer identification number ("TIN"), which, in the
case of a holder who is an individual is his or her social security number. If
the Company is not provided with the correct TIN, the holder may be subject to a
$50 penalty imposed by Internal Revenue Service. In addition, payments that are
made to such holder may be subject to backup withholding. If backup withholding
applies, the Exchange Agent is required to withhold 31% of any payment to the
holder. Backup withholding is not an additional tax. Rather, the tax liability
of persons subject to backup withholding will be reduced by the amount of tax
withheld. If withholding results in an over-payment of taxes, a refund may be
obtained. Certain holders (including, among others, all corporations and certain
foreign individuals) are not subject to these backup withholding and reporting
requirements. See the enclosed "Guidelines for Certification of Taxpayer
Identification Number on Substitute Form W-9" for additional instructions.
 
     To prevent backup withholding, each tendering holder must provide such
holder's correct TIN by completing the Substitute Form W-9 set forth herein,
certifying that the TIN provided is correct (or that such holder is awaiting a
TIN), and that (i) the holder has not been notified by the Internal Revenue
Service that such holder is subject to backup withholding as a result of failure
to report all interest or dividends or (ii) the Internal Revenue Service has
notified the holder that such holder is no longer subject to backup withholding.
If the Old Notes are registered in more than one name or are not in the name of
the actual owner, see the enclosed "Guidelines for Certification of Taxpayer
Identification Number of Substitute Form W-9" for information on which TIN to
report.
 
     The Company reserves the right in its sole discretion to take whatever
steps are necessary to comply with the Company's obligations regarding backup
withholding.
<PAGE>   8
 
     9. Validity of Tenders. All questions as to the validity, form, eligibility
(including time of receipt), acceptance and withdrawal of tendered Old Notes
will be determined by the Company in its sole discretion, which determination
will be final and binding. The Company reserves the absolute right to reject any
and all Old Notes not properly tendered or any Old Notes the Company's
acceptance of which would, in the opinion of the Company or its counsel, be
unlawful. The Company also reserves the absolute right to waive any conditions
of the Exchange Offer or defects or irregularities in tenders as to particular
Old Notes. The Company's interpretation of the terms and conditions of the
Exchange Offer (including this Letter of Transmittal and the instructions
hereto) shall be final and binding on all parties. Unless waived, any defects or
irregularities in connection with tenders of Old Notes must be cured within such
time as the Company shall determine. Neither the Company, the Exchange Agent nor
any other person shall be under any duty to give notification of defects or
irregularities with regard to tenders of Old Notes nor shall any of them incur
any liability for failure to give such notification.
 
     10. Waiver of Conditions. The Company reserves the absolute right to waive,
in whole or part, any of the conditions to the Exchange Offer set forth in the
Prospectus.
 
     11. No Conditional Tender. No alternative, conditional, irregular or
contingent tender of Old Notes on transmittal of this Letter of Transmittal will
be accepted.
 
     12. Mutilated, Lost, Stolen or Destroyed Old Notes. Any holder whose Old
Notes have been mutilated, lost, stolen or destroyed should contact the Exchange
Agent at the address indicated above for further instructions.
 
     13. Requests for Assistance or Additional Copies. Requests for assistance
or for additional copies of the Prospectus or this Letter of Transmittal may be
directed to the Exchange Agent at the address or telephone number set forth on
the cover page of this Letter of Transmittal. Holders may also contact their
broker, dealer, commercial bank, trust company or other nominee for assistance
concerning the Exchange Offer.
 
     14. Withdrawal. Tenders may be withdrawn only pursuant to the limited
withdrawal rights set forth in the Prospectus under the caption "The Exchange
Offer -- Withdrawal of Tenders."
 
IMPORTANT: THIS LETTER OF TRANSMITTAL OR A MANUALLY SIGNED FACSIMILE HEREOF
(TOGETHER WITH THE OLD NOTES DELIVERED BY BOOK-ENTRY TRANSFER OR IN ORIGINAL
HARD COPY FORM) MUST BE RECEIVED BY THE EXCHANGE AGENT, OR THE NOTICE OF
GUARANTEED DELIVERY MUST BE RECEIVED BY THE EXCHANGE AGENT, PRIOR TO THE
EXPIRATION TIME.
<PAGE>   9
         (TO BE COMPLETED BY ALL TENDERING HOLDERS (SEE INSTRUCTION 5))
                     PAYER'S NAME: CLIFFS DRILLING COMPANY
 
<TABLE>
- ---------------------------------------------------------------------------------------------------------------------------
<S>                                   <C>                                           <C>          
                                                                                            Social Security Number
                                                                                        OR     Employer Identification
 SUBSTITUTE                           PART 1 -- PLEASE PROVIDE YOUR TIN                             Number
                                      IN THE BOX AT RIGHT AND CERTIFY
 FORM W-9                             BY SIGNING AND DATING BELOW.                  ---------------------------------------
                                      -------------------------------------------------------------------------------------
                                      PART 2 -- Certification -- Under penalties of perjury, I     PART 3 --
                                      certify that:
 DEPARTMENT OF THE TREASURY           (1) The number shown on this form is my correct               Awaiting TIN [ ]
 INTERNAL REVENUE SERVICE                  Taxpayer Identification Number (or I am waiting for      
                                           a number to be issued to me) and                         
 PAYER'S REQUEST FOR TAXPAYER                                                                       Please complete the
 IDENTIFICATION NUMBER (TIN)          (2) I am not subject to backup withholding either because     Certificate of Awaiting
                                           I have not been notified by the Internal Revenue         Taxpayer Identification
                                           Service ("IRS") that I am subject to backup              Number below.
                                           withholding as a result of failure to report all     
                                           interest or dividends, or the IRS has notified       
                                           me that I am no longer subject to backup             
                                           withholding.                                         
                                                                                                
                                      -------------------------------------------------------------------------------------
                                      Certification Instructions -- You must cross out item (2) in Part 2 above if you have
                                      been notified by the IRS that you are subject to backup withholding because of
                                      underreporting interest or dividends on your tax return. However, if after being
                                      notified by the IRS that you were subject to backup withholding you received another
                                      notification from the IRS stating that you are no longer subject to backup
                                      withholding, do not cross out item (2).

                                       SIGNATURE DATE  ___________________________, 1997
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>
 
NOTE: FAILURE TO COMPLETE AND RETURN THIS FORM MAY RESULT IN BACKUP WITHHOLDING
      OF 31% OF ANY PAYMENTS MADE TO YOU PURSUANT TO THE OFFER. PLEASE REVIEW
      THE ENCLOSED GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
      NUMBER ON SUBSTITUTE FORM W-9 FOR ADDITIONAL DETAILS.
 
           YOU MUST COMPLETE THE FOLLOWING CERTIFICATE IF YOU CHECKED
                  THE BOX IN PART 3 OF THE SUBSTITUTE FORM W-9

- --------------------------------------------------------------------------------
             CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER
 
      I certify under penalties of perjury that a taxpayer identification
 number has not been issued to me, and either (a) I have mailed or delivered an
 application to receive a taxpayer identification number to the appropriate
 Internal Revenue Service Center or Social Security Administration Office or
 (b)I intend to mail or deliver an application in the near future. I understand
 that if I do not provide a taxpayer identification number within 60 days, 31%
 of all reportable payments made to me thereafter will be withheld until I
 provide a number.
 
- ------------------------------------------    ----------------------------, 1997
             Signature                                      Date
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
                     CERTIFICATE FOR FOREIGN RECORD HOLDERS
 
 Under penalties of perjury, I certify that I am not a United States citizen or
 resident (or I am signing for a foreign corporation, partnership, estate or
 trust).
 
- ------------------------------------------   -----------------------------, 1997
             Signature                                      Date
- --------------------------------------------------------------------------------
<PAGE>   10
 
                         NOTICE OF GUARANTEED DELIVERY
                                      FOR
        TENDER OF ALL OUTSTANDING 10.25% SENIOR NOTES DUE 2003, SERIES C
                                IN EXCHANGE FOR
                     10.25% SENIOR NOTES DUE 2003, SERIES D
 
     This form, or one substantially equivalent hereto, must be used by a holder
to accept the Exchange Offer of Cliffs Drilling Company, a Delaware corporation
(the "Company"), and to tender 10.25% Senior Notes due 2003, Series C (the "Old
Notes") to the Exchange Agent pursuant to the guaranteed delivery procedures
described in "The Exchange Offer -- Guaranteed Delivery Procedures" of the
Company's Prospectus, dated November 13, 1997 (the "Prospectus") and in
Instruction 2 to the related Letter of Transmittal. Any holder who wishes to
tender Old Notes pursuant to such guaranteed delivery procedures must ensure
that the Exchange Agent receives this Notice of Guaranteed Delivery prior to the
Expiration Date (as defined below) of the Exchange Offer. Capitalized terms used
but not defined herein have the meanings ascribed to them in the Prospectus or
the Letter of Transmittal.
 
     THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME, ON
DECEMBER 16, 1997. UNLESS EXTENDED (THE "EXPIRATION DATE"). OLD NOTES TENDERED
IN THE EXCHANGE OFFER MAY BE WITHDRAWN AT ANY TIME PRIOR TO 5:00 P.M., NEW YORK
CITY TIME, ON THE BUSINESS DAY PRIOR TO THE EXPIRATION DATE.
 
                 The Exchange Agent for the Exchange Offer is:
 
                      STATE STREET BANK AND TRUST COMPANY
 
                                    By Mail:
                      State Street Bank and Trust Company
                           Corporate Trust Department
                                  P.O. Box 778
                        Boston, Massachusetts 02102-0078
                           By Hand/Overnight Courier:
                      State Street Bank and Trust Company
                           Corporate Trust Department
                                  Fourth Floor
                            Two International Place
                          Boston, Massachusetts 02110
 
                                 By Facsimile:
                                 (617) 664-5232
 
                             Confirm by Telephone:
                                 (617) 664-5314
                             ---------------------
 
     DELIVERY OF THIS NOTICE OF GUARANTEED DELIVERY TO AN ADDRESS OTHER THAN AS
SET FORTH ABOVE, OR TRANSMISSION OF INSTRUCTIONS VIA FACSIMILE OTHER THAN AS SET
FORTH ABOVE, WILL NOT CONSTITUTE A VALID DELIVERY.
 
     THIS NOTICE OF GUARANTEED DELIVERY IS NOT TO BE USED TO GUARANTEE
SIGNATURES. IF A SIGNATURE ON A LETTER OF TRANSMITTAL IS REQUIRED TO BE
GUARANTEED BY AN "ELIGIBLE INSTITUTION" UNDER THE INSTRUCTIONS THERETO, SUCH
SIGNATURE GUARANTEE MUST APPEAR IN THE APPLICABLE SPACE PROVIDED IN THE BOX ON
THE LETTER OF TRANSMITTAL FOR GUARANTEE OF SIGNATURES.
<PAGE>   11
Ladies and Gentlemen:
 
     The undersigned hereby tenders to the Company, upon the terms and subject
to the conditions set forth in the Prospectus and the related Letter of
Transmittal, receipt of which is hereby acknowledged, the principal amount of
Old Notes set forth below pursuant to the guaranteed delivery procedures set
forth in the Prospectus and in Instruction 2 of the Letter of Transmittal.
 
     The undersigned hereby tenders the Old Notes listed below:
 
<TABLE>
<CAPTION>
                                                          AGGREGATE
 CERTIFICATE NUMBER(S) (IF KNOWN) OF OLD NOTES OR         PRINCIPAL        AGGREGATE PRINCIPAL
     ACCOUNT NUMBER AT THE BOOK-ENTRY FACILITY        AMOUNT REPRESENTED     AMOUNT TENDERED
 ------------------------------------------------     ------------------   -------------------
<S>                                                    <C>                  <C>
 


</TABLE>
 
                            PLEASE SIGN AND COMPLETE
 
<TABLE>
<S>                                                  <C>
Names of Record Holders:--------------------------   Signatures:-------------------------------------
 


Addresses: ---------------------------------------   ------------------------------------------------
 

- -------------------------------------------------    Dated: ---------------------------------- , 1997
 

Area Code and Telephone Numbers:-----------------
 

- -------------------------------------------------
</TABLE>
 
     This Notice of Guaranteed Delivery must be signed by the holder(s) exactly
as their name(s) appear on certificates for Old Notes or on a security position
listing as the owner of Old Notes, or by person(s) authorized to become
holder(s) by endorsements and documents transmitted with this Notice of
Guaranteed Delivery. If signature is by a trustee, executor, administrator,
guardian, attorney-in-fact, officer or other person acting in a fiduciary or
representative capacity, such person must provide the following information.
 
                      PLEASE PRINT NAME(S) AND ADDRESS(ES)
 
Name(s):
 
- --------------------------------------------------------------------------------
 
- --------------------------------------------------------------------------------
 
- --------------------------------------------------------------------------------
 
Capacity:
 
- --------------------------------------------------------------------------------
 
Address(es):
 
- --------------------------------------------------------------------------------
 
- --------------------------------------------------------------------------------
 
                                        2
<PAGE>   12
                                   GUARANTEE
 
                    (NOT TO BE USED FOR SIGNATURE GUARANTEE)
 
     The undersigned, a firm which is a member of a registered national
securities exchange or of the National Association of Securities Dealers, Inc.,
or is a commercial bank or trust company having an office or correspondent in
the United States, or is otherwise an "eligible guarantor institution" within
the meaning of Rule 17Ad-15 under the Securities Exchange Act of 1934,
guarantees deposit with the Exchange Agent of the Letter of Transmittal (or
facsimile thereof), together with the Old Notes tendered hereby in proper form
for transfer (or confirmation of the book-entry transfer of such Old Notes into
the Exchange Agent's account at the Book-Entry Transfer Facility described in
the Prospectus under the caption "The Exchange Offer -- Book-Entry Transfer" and
in the Letter of Transmittal) and any other required documents, all by 5:00
p.m., New York City time, within five business days following the Expiration
Date.
 
<TABLE>
<S>                                                      <C>
Name of Firm: ------------------------------------       -----------------------------------------------------
                                                                        (AUTHORIZED SIGNATURE)

Address: -----------------------------------------       Name: -----------------------------------------------
                               (INCLUDE ZIP CODE)        

Area Code and Tel. Number:                               Title: -----------------------------------------------
                                                                         (PLEASE TYPE OR PRINT)

- -----------------------------------------------------     Date: ----------------------------------------- , 1997
</TABLE>
 
     DO NOT SEND OLD NOTES WITH THIS FORM. ACTUAL SURRENDER OF OLD NOTES MUST BE
MADE PURSUANT TO, AND BE ACCOMPANIED BY, A PROPERLY COMPLETED AND DULY EXECUTED
LETTER OF TRANSMITTAL AND ANY OTHER REQUIRED DOCUMENTS.
 

                                        3
<PAGE>   13
 
                 INSTRUCTIONS FOR NOTICE OF GUARANTEED DELIVERY
 
     1. Delivery of this Notice of Guaranteed Delivery.  A properly completed
and duly executed copy of this Notice of Guaranteed Delivery and any other
documents required by this Notice of Guaranteed Delivery must be received by the
Exchange Agent at its address set forth herein prior to the Expiration Date. The
method of delivery of this Notice of Guaranteed Delivery and any other required
documents to the Exchange Agent is at the election and sole risk of the holder,
and the delivery will be deemed made only when actually received by the Exchange
Agent. If delivery is by mail, registered mail with return receipt requested,
properly insured, is recommended. As an alternative to delivery by mail, the
holders may wish to consider using an overnight or hand delivery service. In all
cases, sufficient time should be allowed to assure timely delivery. For a
description of the guaranteed delivery procedures, see Instruction 2 of the
Letter of Transmittal.
 
     2. Signatures on this Notice of Guaranteed Delivery.  If this Notice of
Guaranteed Delivery is signed by the registered holder(s) of the Old Notes
referred to herein, the signature must correspond with the name(s) written on
the face of the Old Notes without alteration, enlargement, or any change
whatsoever. If this Notice of Guaranteed Delivery is signed by a participant of
the Book-Entry Transfer Facility whose name appears on a security position
listing as the owner of the Old Notes, the signature must correspond with the
name shown on the security position listing as the owner of the Old Notes.
 
     If this Notice of Guaranteed Delivery is signed by a person other than the
registered holder(s) of any Old Notes listed or a participant of the Book-Entry
Transfer Facility, this Notice of Guaranteed Delivery must be accompanied by
appropriate bond powers, signed as the name of the registered holder(s) appears
on the Old Notes or signed as the name of the participant shown on the
Book-Entry Transfer Facility's security position listing.
 
     If this Notice of Guaranteed Delivery is signed by a trustee, executor,
administrator, guardian, attorney-in-fact, officer of a corporation, or other
person acting in a fiduciary or representative capacity, such person should so
indicate when signing and submit with the Letter of Transmittal evidence
satisfactory to the Company of such person's authority to so act.
 
     3. Requests for Assistance or Additional Copies.  Questions and requests
for assistance and requests for additional copies of the Prospectus may be
directed to the Exchange Agent at the address specified in the Prospectus.
Holders may also contact their broker, dealer, commercial bank, trust company,
or other nominee for assistance concerning the Exchange Offer.
 
                                        4
<PAGE>   14
 
                            CLIFFS DRILLING COMPANY
 
                        LETTER TO REGISTERED HOLDERS AND
                     DEPOSITORY TRUST COMPANY PARTICIPANTS
                                      FOR
        TENDER OF ALL OUTSTANDING 10.25% SENIOR NOTES DUE 2003, SERIES C
                                IN EXCHANGE FOR
                     10.25% SENIOR NOTES DUE 2003, SERIES D
 
        THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME,
         ON DECEMBER 16, 1997, UNLESS EXTENDED (THE "EXPIRATION DATE").
 
           OLD NOTES TENDERED IN THE EXCHANGE OFFER MAY BE WITHDRAWN
           AT ANY TIME PRIOR TO 5:00 P.M., NEW YORK CITY TIME, ON THE
                   BUSINESS DAY PRIOR TO THE EXPIRATION DATE.
 
To Registered Holders and Depository
  Trust Company Participants:
 
     We are enclosing herewith the material listed below relating to the offer
by Cliffs Drilling Company, a Delaware corporation (the "Company"), to exchange
its 10.25% Senior Notes due 2003, Series D (the "Exchange Notes"), which have
been registered under the Securities Act of 1933, as amended (the "Securities
Act"), for a like principal amount of its issued and outstanding 10.25% Senior
Notes due 2003, Series C (the "Old Notes") upon the terms and subject to the
conditions set forth in the Company's Prospectus, dated November 13, 1997, and
the related Letter of Transmittal (which together constitute the "Exchange
Offer").
 
     Enclosed herewith are copies of the following documents:
 
          1. Prospectus dated November 13, 1997;
 
          2. Letter of Transmittal (together with accompanying Substitute Form
     W-9 Guidelines);
 
          3. Notice of Guaranteed Delivery;
 
          4. Letter which may be sent to your clients for whose account you hold
     Old Notes in your name or in the name of your nominee; and
 
          5. Letter which may be sent from your clients to you with such
     client's instruction with regard to the Exchange Offer.
 
     We urge you to contact your clients promptly. Please note that the Exchange
Offer will expire on the Expiration Date unless extended.
 
     The Exchange Offer is not conditioned upon any minimum number of Old Notes
being tendered.
 
     Pursuant to the Letter of Transmittal, each holder of Old Notes will
represent to the Company that (i) the Exchange Notes acquired in exchange for
Old Notes pursuant to the Exchange Offer are being acquired in the ordinary
course of business of the person receiving such Exchange Notes, whether or not
the holder, (ii) the holder is not participating in, and has no arrangement with
any person to participate in, the distribution of Exchange Notes within the
meaning of the Securities Act, and (iii) neither the holder nor any such other
person is an "affiliate" (within the meaning of Rule 405 under the Securities
Act) of the Company or a broker-dealer tendering Old Notes acquired directly
from the Company. If the holder is a broker-dealer that will receive Exchange
Notes for its own account in exchange for Old Notes, it acknowledges that it
will deliver a prospectus in connection with any resale of such Exchange Notes.
 
     The enclosed Letter to Clients contains an authorization by the beneficial
owners of the Old Notes for you to make the foregoing representations.
 
     The Company will not pay any fee or commission to any broker or dealer or
to any other persons (other than the Exchange Agent) in connection with the
solicitation of tenders of Old Notes pursuant to the Exchange Offer. The Company
will pay or cause to be paid any transfer taxes payable on the transfer of Old
Notes to it, except as otherwise provided in Instruction 7 of the enclosed
Letter of Transmittal.
 
     Additional copies of the enclosed material may be obtained from the
undersigned.
 
                                      Very truly yours,
 
                                      STATE STREET BANK AND TRUST COMPANY
<PAGE>   15
 
                            CLIFFS DRILLING COMPANY
 
                               LETTER TO CLIENTS
                                      FOR
        TENDER OF ALL OUTSTANDING 10.25% SENIOR NOTES DUE 2003, SERIES C
                                IN EXCHANGE FOR
                     10.25% SENIOR NOTES DUE 2003, SERIES D
 
        THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME,
         ON DECEMBER 16, 1997, UNLESS EXTENDED (THE "EXPIRATION DATE").
             NOTES TENDERED IN THE EXCHANGE OFFER MAY BE WITHDRAWN
           AT ANY TIME PRIOR TO 5:00 P.M., NEW YORK CITY TIME, ON THE
                   BUSINESS DAY PRIOR TO THE EXPIRATION DATE.
 
To Our Clients:
 
     We are enclosing herewith a Prospectus, dated November 13, 1997, of Cliffs
Drilling Company, a Delaware corporation (the "Company") and a related Letter of
Transmittal, which together constitute the Company's offer (the "Exchange
Offer") to exchange its 10.25% Senior Notes due 2003, Series D (the "Exchange
Notes"), which have been registered under the Securities Act of 1933, as amended
(the "Securities Act") for a like principal amount of its issued and outstanding
10.25% Senior Notes due 2003, Series C (the "Old Notes"), upon the terms and
subject to the conditions set forth in the Exchange Offer.
 
     The Exchange Offer is not conditioned upon any minimum number of Old Notes
being tendered.
 
     We are the holder of record of Old Notes held by us for your own account. A
tender of such Old Notes can be made only by us as the record holder and
pursuant to your instructions. The Letter of Transmittal is furnished to you for
your information only and cannot be used by you to tender Old Notes held by us
for your account.
 
     We request instructions as to whether you wish to tender any or all of the
Old Notes held by us for your account pursuant to the terms and conditions of
the Exchange Offer. We also request that you confirm that we may on your behalf
make the representations and warranties contained in the Letter of Transmittal.
 
                                      Very truly yours,
<PAGE>   16
 
     PLEASE RETURN YOUR INSTRUCTIONS TO US IN THE ENCLOSED ENVELOPE WITHIN AMPLE
TIME TO PERMIT US TO SUBMIT A TENDER ON YOUR BEHALF PRIOR TO THE EXPIRATION
DATE.
 
                  INSTRUCTION TO REGISTERED HOLDER AND/OR BOOK
                           ENTRY TRANSFER PARTICIPANT
 
To Registered Holder and/or Participant of the Book-Entry Transfer Facility:
 
     The undersigned hereby acknowledges receipt of the Prospectus dated
November 13, 1997 (the "Prospectus") of Cliffs Drilling Company, a Delaware
corporation (the "Company"), and the accompanying Letter of Transmittal (the
"Letter of Transmittal"), that together constitute the Company's offer (the
"Exchange Offer") to exchange its 10.25% Senior Notes due 2003, Series D (the
"Exchange Notes"), for all of its outstanding 10.25% Senior Notes due 2003,
Series C (the "Old Notes"). Capitalized terms used but not defined herein have
the meanings ascribed to them in the Prospectus.
 
     This will instruct you, the registered holder and/or book-entry transfer
facility participant, as to the action to be taken by you relating to the
Exchange Offer with respect to the Old Notes held by you for the account of the
undersigned.
 
     The aggregate face amount of the Old Notes held by you for the account of
the undersigned is (FILL IN AMOUNT):
 
     $________________________ of the 10.25% Senior Notes due 2003, Series C.
 
     With respect to the Exchange Offer, the undersigned hereby instructs you
(CHECK APPROPRIATE BOX):
 
          [ ]  To TENDER the following Old Notes held by you for the account of
     the undersigned (INSERT PRINCIPAL AMOUNT OF OLD NOTES TO BE TENDERED) (IF
     ANY):  $________________________.
 
          [ ]  NOT to TENDER any Old Notes held by you for the account of the
     undersigned.
 
     If the undersigned instructs you to tender the Old Notes held by you for
the account of the undersigned, it is understood that you are authorized to
make, on behalf of the undersigned (and the undersigned, by its signature below,
hereby makes to you), the representations and warranties contained in the Letter
of Transmittal that are to be made with respect to the undersigned as a
beneficial owner, including but not limited to the representations that (i) the
Exchange Notes acquired in exchange for Old Notes pursuant to the Exchange Offer
are being acquired in the ordinary course of business of the person receiving
such Exchange Notes, whether or not undersigned, (ii) the undersigned is not
participating in, and has no arrangement with any person to participate in, the
"distribution" (within the meaning of the Securities Act) of Exchange Notes, and
(iii) neither the undersigned nor any such other person is an "affiliate"
(within the meaning of Rule 405 under the Securities Act) of the Company or a
broker-dealer tendering Old Notes acquired directly from the Company. If the
undersigned is a broker-dealer that will receive Exchange Notes for its own
account in exchange for Old Notes, it acknowledges that it will deliver a
prospectus in connection with any resale of such Exchange Notes.
 
                                   SIGN HERE
 
Name of beneficial owner(s):
 
Signature(s):
 
Name(s) (please print):
 
Address:
 
Telephone Number:
 
Taxpayer Identification or Social Security Number:
 
Date:
 
                                        2


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