NOBLE DRILLING CORP
8-K, 1996-09-06
DRILLING OIL & GAS WELLS
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549


                                    FORM 8-K

                                 CURRENT REPORT


                     Pursuant to Section 13 or 15(d) of the
                        Securities Exchange Act of 1934

               Date of Report (Date of earliest event reported):

                               SEPTEMBER 6, 1996


                          NOBLE DRILLING CORPORATION
            (Exact name of registrant as specified in its charter)



Delaware                       0-13857                       73-0374541
(State or other                (Commission                   (IRS Employer
jurisdiction of                File Number)                  Identification No.)
incorporation)



         10370 Richmond Avenue, Suite 400, Houston, Texas      77042
         (Address of principal executive offices)         (Zip Code)



              Registrant's telephone number, including area code:

                                 (713) 974-3131
<PAGE>   2
Item 5.  Other Events.

         Noble Drilling Corporation (the "Company") announced today that it is
soliciting consents (the "Consents"), upon the terms and subject to the
conditions set forth in a Consent Solicitation Statement and the accompanying
form of Consent (together, the "Consent Solicitation"), to the execution of a
First Supplemental Indenture effecting certain proposed amendments (the
"Proposed Amendments") to the Indenture dated as of October 1, 1993 (the
"Indenture") between the Company and Texas Commerce Bank National Association,
as trustee, pursuant to which the 9 1/4% Senior Notes Due 2003 (the "9 1/4%
Senior Notes") of the Company were issued.  The Consents are being solicited
from holders of record of the 9 1/4% Senior Notes as of 5:00 P.M., New York
City time, on Thursday, September 5, 1996.

         The purpose of the Proposed Amendments is to make the definitions,
covenants and events of default contained in the Indenture consistent with
those contained in the Indenture dated as of July 1, 1996 between the Company
and Texas Commerce Bank National Association, as trustee, pursuant to which
$125,000,000 principal amount of 9 1/8% Senior Notes due 2006 (the "9 1/8%
Senior Notes") of the Company were issued on July 1, 1996.

         Attached hereto as Exhibit 99.1 is the press release announcing the
Consent Solicitation, and attached hereto as Exhibit 99.2 is the Consent
Solicitation Statement (excluding Annex III, which is the Prospectus of the
Company dated June 26, 1996 relating to the 9 1/8% Senior Notes, and Annex IV,
which is the Company's Form 10-Q for the quarterly period ended June 30, 1996).

Item 7.  Financial Statements and Exhibits.

         (c)     Exhibits.

<TABLE>
<CAPTION>
                 Exhibit No.      Description
                 -----------      -----------
                    <S>           <C>
                    99.1          Press Release dated September 6, 1996

                    99.2          Consent Solicitation Statement dated September 6, 1996
</TABLE>
<PAGE>   3
                                   SIGNATURES

         Pursuant to the requirement of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


Date:  September 6, 1996                NOBLE DRILLING CORPORATION


                                        By:/s/ Byron L. Welliver
                                           -------------------------------------
                                            Byron L. Welliver,
                                            Senior Vice President-Finance,
                                               Treasurer and Controller
<PAGE>   4
                               INDEX TO EXHIBITS


<TABLE>
<CAPTION>
 Exhibit                                                                                     Sequentially
 Number                                              Exhibit                                Numbered Page
- ---------                        ----------------------------------------------            ---------------
 <S>                             <C>
 99.1 -                          Press Release dated September 6, 1996

 99.2 -                          Consent Solicitation Statement dated September
                                 6, 1996
</TABLE>

<PAGE>   1
                                                                    EXHIBIT 99.1




                  NOBLE DRILLING CONDUCTS CONSENT SOLICITATION

         HOUSTON, Texas -- September 6, 1996 -- Noble Drilling Corporation
announced that it was soliciting consents, upon the terms and subject to the
conditions set forth in a Consent Solicitation Statement dated September 6,
1996, to the execution of a First Supplemental Indenture effecting certain
proposed amendments to the Indenture dated as of October 1, 1993 between the
Company and Texas Commerce Bank National Association, as trustee, pursuant to
which the 9 1/4% Senior Notes Due 2003 of the company were issued.  The
consents are being solicited from holders of record of the 9 1/4% Senior Notes
as of 5:00 P.M., New York City time, on Thursday, September 5, 1996 (the
"record date") and are due prior to 5:00 P.M., New York City time, on Friday,
September 27, 1996, unless the solicitation period is extended by the company.

         The purpose of the proposed amendments is to make the definitions,
covenants and events of default contained in the indenture governing the 9 1/4%
Senior Notes consistent with those contained in the Indenture dated as of July
1, 1996 between the Company and Texas Commerce Bank National Association, as
trustee, governing the company's 9 1/8% Senior Notes due 2006.  The company
issued $125,000,000 principal amount of 9 1/8% Senior Notes due 2006 on July 1,
1996.

         
<PAGE>   2

         The changes sought to be effected by the proposed amendments will not
alter the company's obligation to pay the principal of or interest on the 9
1/4% Senior Notes or alter the stated interest rate or maturity date of the 9
1/4% Senior Notes.  The terms and conditions of the consent solicitation are
contained in a Consent Solicitation Statement dated this date which is being
distributed to the holders of record of 9 1/4% Senior Notes as of the record
date.

         Noble Drilling Corporation is a major drilling contractor with
offshore and land operations in the United States, Canada, Mexico, the United
Kingdom, Africa, the Middle East, South America and India.  The company's
Common Stock and $1.50 Convertible Preferred Stock are traded on the New York
Stock Exchange under the symbols "NE" and "NEpf," respectively.

                                      ####

For additional information, contact:
Byron L. Welliver, Senior Vice President - Finance, Treasurer
      and Controller
Noble Drilling Corporation, 713-974-3131

<PAGE>   1
                                                                    EXHIBIT 99.2




CONSENT SOLICITATION STATEMENT
                                                           [NOBLE LOGO]

                           NOBLE DRILLING CORPORATION
                      SOLICITATION OF CONSENTS RELATING TO
                    $125,000,000 AGGREGATE PRINCIPAL AMOUNT
                      OF ITS 9 1/4% SENIOR NOTES DUE 2003

         Noble Drilling Corporation (the "Company") hereby solicits consents
(the "Consents"), upon the terms and subject to the conditions in this Consent
Solicitation Statement and the accompanying form of Consent (together, the
"Consent Solicitation"), to the execution of a First Supplemental Indenture
(the "First Supplemental Indenture") effecting certain proposed amendments (the
"Proposed Amendments") to the Indenture dated as of October 1, 1993 (the
"Indenture") between the Company and Texas Commerce Bank National Association,
as trustee (the "Trustee"), pursuant to which the 9 1/4% Senior Notes Due 2003
(the "9 1/4% Senior Notes") of the Company were issued.  The Consents are being
solicited from holders of record (each a "Holder" and collectively, the
"Holders") of the 9 1/4% Senior Notes as of 5:00 P.M., New York City time, on
Thursday, September 5, 1996 (the "Record Date").  For a description of the
Proposed Amendments, see "The Proposed Amendments."

         The purpose of the Proposed Amendments is to make the definitions,
covenants and events of default contained in the Indenture consistent with
those contained in the Indenture dated as of July 1, 1996 (the "1996
Indenture") between the Company and Texas Commerce Bank National Association,
as trustee, pursuant to which $125,000,000 principal amount of 9 1/8% Senior
Notes due 2006 (the "9 1/8% Senior Notes") of the Company were issued on July
1, 1996.  See "The Proposed Amendments--The Neddrill Acquisition" and "The
Proposed Amendments--9 1/8% Senior Notes due 2006."

         Adoption of the Proposed Amendments requires the Consent of Holders as
of the Record Date of a majority in principal amount of the Outstanding (as
defined in the Indenture) 9 1/4% Senior Notes (the "Required Consents").  In
the event the Proposed Amendments are effected, the Company will, promptly
after the Expiration Date (as defined below), pay to the Holders as of the
Record Date of 9 1/4% Senior Notes in respect of which there has been delivered
valid and unrevoked Consents prior to the Expiration Date, $3.75 in cash for
each $1,000 in principal amount of Outstanding 9 1/4% Senior Notes (a "Consent
Payment").  Only a Holder as of the Record Date of the 9 1/4% Senior Notes in
respect of which there has been delivered a valid and unrevoked Consent prior
to the Expiration Date will be entitled to receive a Consent Payment.  A HOLDER
AS OF THE RECORD DATE WHO DISAPPROVES OR HOLDS A 9 1/4% SENIOR NOTE IN RESPECT
OF WHICH NO CONSENT HAS BEEN SUBMITTED WILL NOT BE ENTITLED TO RECEIVE A
CONSENT PAYMENT.  See "The Consent Solicitation--Consent Payments."

         Consents will not be effective unless completed in accordance with the
instructions set forth therein and herein and returned to Texas Commerce Bank
National Association (the "Depositary") at (a) if by mail or courier, 55 Water
Street, North Building, Room 234, Windows 20 and 21, New York, New York 10041,
Attention: Corporate Trust Services, OR 1201 Main Street, 18th Floor, Dallas,
Texas  75202 OR 600 Travis Street, 8th Floor, Houston, Texas  77002, Attention:
Global Trust Services--Noble Drilling, (b) if by hand delivery, 55 Water
Street, North Building, Room 234, Windows 20 and 21, New York, New York 10041,
Attention: Corporate Trust Services OR 1201 Main Street, 18th Floor, Dallas,
Texas  75202 and (c) if by facsimile, (214) 672-5744, Attention: Frank Ivins,
confirmed by telephone at (214) 672-5678, in each case prior to the Expiration
Date.  The term "Expiration Date" means 5:00 P.M., New York City time, on
September 27, 1996, unless the Company, in its sole discretion, extends the
period during which the Consent Solicitation is open, in which event the term
"Expiration Date" means the latest time and date to which the Consent
Solicitation is so extended.

         THE CONSENT SOLICITATION COMMENCES ON FRIDAY, SEPTEMBER 6, 1996, AND
WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME, ON FRIDAY, SEPTEMBER 27, 1996,
UNLESS OTHERWISE EXTENDED.  CONSENTS MAY BE REVOKED AT ANY TIME PRIOR TO THE
EXPIRATION DATE ON THE TERMS AND SUBJECT TO THE CONDITIONS SET FORTH HEREIN.
SEE "THE CONSENT SOLICITATION--REVOCATION OF CONSENTS."

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

         Please handle this matter through your broker or bank.  For further
information relating to the Consent Solicitation or to obtain copies of this
Consent Solicitation Statement, please contact the Information Agent (as
defined herein) at the telephone number set forth on the back cover page of
this Consent Solicitation Statement.

September 6, 1996
<PAGE>   2
         Subject to the terms hereof, promptly after the Expiration Date,
assuming the Required Consents are received (and not revoked), the First
Supplemental Indenture amending the Indenture to effect the Proposed Amendments
will be executed.  Upon the execution of the First Supplemental Indenture, the
9 1/4% Senior Notes will become subject to the provisions thereof regardless of
whether a Holder as of the Record Date has consented to the Consent
Solicitation.  The proposed form of First Supplemental Indenture is attached
hereto as Annex I.

         Only a Holder as of the Record Date (or such Holder's legal
representatives) may execute and deliver a Consent, and unless revoked prior to
the Expiration Date by the Holder as of the Record Date, such Consent will be
binding on all subsequent transferees of such Holder's 9 1/4% Senior Notes in
respect of which the Consent was given.  Any beneficial owner as of the Record
Date of 9 1/4% Senior Notes who is not the Holder of such 9 1/4% Senior Notes
must arrange with the person who is the Holder as of the Record Date or such
Holder's assignee or nominee to execute and deliver a Consent on behalf of such
beneficial owner.  For purposes of the Consent Solicitation, the term "Holder"
shall be deemed to include the participants (the "DTC Participants") through
which a beneficial owner's 9 1/4% Senior Notes are held on the Record Date with
The Depository Trust Company ("DTC").  DTC has authorized DTC Participants to
execute Consents as if they were Holders.  See "The Consent
Solicitation--Consent Procedures" and "The Consent Solicitation--Revocation of
Consents."

         Regardless of the outcome of the Consent Solicitation, or whether the
Proposed Amendments become effective, the 9 1/4% Senior Notes will continue to
be outstanding in accordance with all other terms of the 9 1/4% Senior Notes
and the Indenture.  The changes sought to be effected by the Proposed
Amendments will not alter the Company's obligation to pay the principal of or
interest on the 9 1/4% Senior Notes or alter the stated interest rate or
maturity date of the 9 1/4% Senior Notes.

         The Company expressly reserves the right, in its sole discretion,
subject to applicable law, (i) to terminate the Consent Solicitation at any
time and for any reason by giving notice to the Information Agent and the
Depositary, (ii) to amend the terms of the Consent Solicitation, (iii) to
modify the form or amount of the consideration to be paid pursuant to the
Consent Solicitation and (iv) not to extend the Consent Solicitation beyond the
original Expiration Date or any date to which the Consent Solicitation has been
previously extended, whether or not the Required Consents have been received by
such date.  Any termination, waiver, extension, amendment or modification
applicable to the Consent Solicitation will apply to all Outstanding 9 1/4%
Senior Notes.  Consents may be revoked at any time up to, but will become
irrevocable at, the Expiration Date.

         HOLDERS AS OF THE RECORD DATE OF 9 1/4% SENIOR NOTES WHO WISH TO
CONSENT AND RECEIVE THE CONSENT PAYMENT SHOULD MAIL, HAND DELIVER OR SEND BY
OVERNIGHT COURIER OR FACSIMILE (CONFIRMED BY PHYSICAL DELIVERY) THEIR PROPERLY
COMPLETED AND EXECUTED CONSENTS (INCLUDING THE FORM W-9 ATTACHED THERETO) TO
TEXAS COMMERCE BANK NATIONAL ASSOCIATION, THE DEPOSITARY, AT THE ADDRESS SET
FORTH ON THE BACK COVER PAGE OF THIS CONSENT SOLICITATION STATEMENT AND IN THE
FORM OF CONSENT IN ACCORDANCE WITH THE INSTRUCTIONS SET FORTH HEREIN AND
THEREIN.  CONSENTS SHOULD NOT BE DELIVERED TO THE COMPANY OR THE INFORMATION
AGENT.  HOWEVER, THE COMPANY RESERVES THE RIGHT TO ACCEPT ANY CONSENT RECEIVED
BY IT OR THE INFORMATION AGENT.

         HOLDERS OF 9 1/4% SENIOR NOTES SHOULD NOT TENDER OR DELIVER 9 1/4%
SENIOR NOTES TO THE COMPANY, THE INFORMATION AGENT OR THE DEPOSITARY AT ANY
TIME.





                                       2
<PAGE>   3
                              TABLE OF CONTENTS

<TABLE>
<S>                                                                                                                   <C>
AVAILABLE INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4

INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5

THE PROPOSED AMENDMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
         General  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
         The Neddrill Acquisition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
         9 1/8% Senior Notes due 2006 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
         Reasons for the Proposed Amendments  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
         Summary of Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
         Interest of Certain Persons in the Proposed Amendments . . . . . . . . . . . . . . . . . . . . . . . . . . .   9

THE CONSENT SOLICITATION  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
         General  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
         Required Consents  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
         Expiration Date; Extensions; Amendment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
         Consent Payments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
         Failure to Obtain Required Consents  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
         Consent Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
         Revocation of Consents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
         Conditions of the Consent Solicitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
         The Information Agent and the Depositary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14

CONSENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

REVOCATION OF CONSENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . R-1

ANNEX I     --   FORM OF FIRST SUPPLEMENTAL INDENTURE

ANNEX II    --   TEXT OF PROPOSED AMENDMENTS MARKED TO SHOW CHANGES

ANNEX III   --   THE COMPANY'S PROSPECTUS DATED JUNE 26, 1996

ANNEX IV    --   THE COMPANY'S FORM 10-Q FOR THE QUARTER ENDED JUNE 30, 1996
</TABLE>





                                       3
<PAGE>   4
                             AVAILABLE INFORMATION


         The Company is subject to the information requirements of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and in
accordance therewith files reports, proxy and information statements, and other
information with the Securities and Exchange Commission (the "Commission").
These reports, proxy and information statements, and other information
concerning the Company can be inspected and copied at the public reference
facilities maintained by the Commission at Room 1024, 450 Fifth Street, N.W.,
Judiciary Plaza, Washington, D.C. 20549, and at the following regional offices
of the Commission:  Northwestern Atrium Center, Suite 1400, 500 West Madison
Street, Chicago, Illinois 60661- 2551; and Seven World Trade Center, 13th
Floor, New York, New York 10048.  Copies of such material can also be obtained
from the Commission at prescribed rates through its Public Reference Section at
Room 1024, 450 Fifth Street, N.W., Judiciary Plaza, Washington, D.C. 20549.  In
addition, the Common Stock of the Company is listed on the New York Stock
Exchange, 20 Broad Street, New York, New York, where such material can also be
inspected and copied.

         Statements made in this Consent Solicitation Statement concerning the
provisions of any contract, agreement, indenture or other document referred to
herein are not necessarily complete.  With respect to each such statement
concerning a contract, agreement, indenture or other document filed with the
Commission, reference is made to such filing for more complete documentation,
and each such statement is qualified in its entirety by such reference.

         The Company is not aware of any jurisdiction in which the making of
the Consent Solicitation is not in compliance with applicable law.  If the
Company becomes aware of any jurisdiction in which the making of the Consent
Solicitation would not be in compliance with applicable law, it will make a
good faith effort to comply with such law.  If, after such good faith effort,
the Company cannot comply with such law, Consents will not be solicited from
holders of 9 1/4% Senior Notes residing in such jurisdiction, any such Consents
already received will not be accepted and no Consent Payment will be made with
respect to such Consents.  In any jurisdiction where the securities, blue sky
or other laws require the Consent Solicitation to be made by a licensed broker
or dealer, the Consent Solicitation will be deemed to be made on behalf of the
Company by one or more registered brokers or dealers licensed under the laws of
such jurisdiction.

         The delivery of this Consent Solicitation Statement shall not under
any circumstances create any implication that the information contained herein
is correct as of any time subsequent to the date hereof or, in the case of
information incorporated herein by reference, subsequent to the date thereof,
or that there has been no change in the information contained or incorporated
herein or in the affairs of the Company since the date hereof or thereof, as
the case may be.





                                       4
<PAGE>   5
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE


         The following documents, which have been filed by the Company with the
Commission (File No. 0-13857) pursuant to the Exchange Act, are incorporated
herein by reference and made a part of this Consent Solicitation Statement:

         (i)     The Company's Annual Report on Form 10-K for the fiscal year
                 ended December 31, 1995, as amended by Form 10-K/A dated June
                 28, 1996;

         (ii)    The Company's Quarterly Report on Form 10-Q for the quarter
                 ended March 31, 1996;

         (iii)   The Company's Quarterly Report on Form 10-Q for the quarter
                 ended June 30, 1996, attached to this Consent Solicitation
                 Statement as Annex IV; and

         (iv)    The Company's Current Report on Form 8-K dated July 16, 1996.

         All documents filed by the Company pursuant to Section 13(a), 13(c),
14 or 15(d) of the Exchange Act after the date of this Consent Solicitation
Statement and prior to the Expiration Date shall also be deemed to be
incorporated by reference in this Consent Solicitation Statement and to be a
part hereof from the date of filing of such documents.  Any statement contained
in this Consent Solicitation Statement or in a document or information
incorporated or deemed to be incorporated by reference herein shall be deemed
to be modified or superseded for purposes of this Consent Solicitation
Statement 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 Consent Solicitation Statement.

         The Company undertakes to provide, without charge, to each person,
including any beneficial owner, to whom a copy of this Consent Solicitation
Statement is delivered, upon the written or oral request of such person, a copy
of the Indenture and of any and all information incorporated by reference in
this Consent Solicitation Statement and not attached hereto (excluding exhibits
to such incorporated information unless such exhibits are specifically
incorporated by reference into such information).  Requests should be directed
to the Information Agent at its address and telephone number set forth on the
back cover page of this Consent Solicitation Statement.

         NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS IN CONNECTION WITH THE CONSENT SOLICITATION OTHER THAN AS SET
FORTH HEREIN AND IN THE FORM OF CONSENT.  ANY INFORMATION OR REPRESENTATIONS
NOT SET FORTH HEREIN, IN A SUPPLEMENT HERETO OR IN THE FORM OF CONSENT ARE NOT
AUTHORIZED AND SHOULD NOT BE RELIED UPON.





                                       5
<PAGE>   6
                            THE PROPOSED AMENDMENTS


         The description of the terms of the current Indenture and the Proposed
Amendments set forth below is only a summary and is qualified by the terms and
conditions of (i) the Indenture, a copy of which has been filed with the
Commission pursuant to the Exchange Act, and (ii) the First Supplemental
Indenture in the form attached to this Consent Solicitation Statement as Annex
I.  In addition, the text of the Proposed Amendments (excluding the new defined
terms and new Section 10.19 which are set forth in Section 1.01(a) and Section
1.05, respectively, of the First Supplemental Indenture), marked to show
changes, is included in this Consent Solicitation Statement in Annex II.
Holders of 9 1/4% Senior Notes should carefully review the First Supplemental
Indenture before granting the Consents.

         Capitalized terms used herein that are not defined in this Consent
Solicitation Statement shall have the meanings assigned to them in the
Indenture unless otherwise indicated.

GENERAL

         The Company is a leading provider of diversified services for the oil
and gas industry worldwide.  The Company's activities include offshore and land
drilling services, turnkey drilling services and engineering and production
management services.  The Company's drilling fleet is broadly diversified,
allowing it to work in a variety of operating conditions.  Noble Drilling
Corporation and its predecessors have been engaged in the contract drilling of
oil and gas wells for others domestically since 1921 and internationally during
various periods since 1939.

         The Company's business strategy has been to actively expand its
international and offshore drilling capabilities through acquisitions and rig
upgrades and modifications, and by redeploying assets in important geological
areas.  In recent years the Company has included within its strategic
objectives a focus on increasing the number of rigs in its fleet capable of
drilling in deeper water depths.

         Since 1988, the Company has completed a series of strategic
acquisitions including: the acquisition of Neddrill on July 1, 1996 (see "The
Neddrill Acquisition" immediately below); the purchases in 1996 and late 1995
of four independent leg cantilevered jackup rigs; the 1994 merger with Chiles
Offshore Corporation, which added 13 jackup rigs to the Company's fleet; and
the 1993 purchase of nine jackup rigs from The Western Company of North
America.

THE NEDDRILL ACQUISITION

         On July 1, 1996, the Company completed its agreement of sale and
purchase with Royal Nedlloyd N.V. ("Nedlloyd") and its wholly owned subsidiary,
Neddrill Holding B.V., to acquire the assets of Nedlloyd's offshore drilling
division Neddrill ("Neddrill").  The Company acquired the assets of Neddrill
utilized in its offshore contract drilling, accommodation and other oil and gas
exploration and production related service businesses, $25,000,000 in net
working capital, and the personnel employed by Neddrill for $300,000,000 in
cash plus 5,000,000 shares of Common Stock of the Company.  For additional
information regarding the Neddrill acquisition, see the sections captioned "Use
of Proceeds" and "The Acquisition", which appear on pages 16 and 24-26,
respectively, of the Prospectus of the Company dated June 26, 1996, which
constitutes Part I of the Registration Statement of the Company on Form S-3
(Registration No. 333-02929) (the "Debt Prospectus").  A copy of the Debt
Prospectus is attached to this Consent Solicitation Statement as Annex III.

         In order to fund the cash portion of the purchase price of the
Neddrill acquisition, on July 1, 1996, the Company issued and sold in public
offerings $125,000,000 principal amount of 9 1/8% Senior Notes and 21,850,000
shares of Common Stock of the Company (including 2,850,000 shares issued in
connection with the exercise by the underwriters of the over-allotment
options).





                                       6
<PAGE>   7
9 1/8% SENIOR NOTES DUE 2006

         The 9 1/8% Senior Notes were issued under the 1996 Indenture on July
1, 1996.  The terms of the 9 1/8% Senior Notes are summarized in the section
captioned "Description of Senior Notes", which appears on pages 39-61 of the
Debt Prospectus.  The 9 1/4% Senior Notes rank pari passu in right of payment
with the 9 1/8% Senior Notes.

         The 9 1/8% Senior Notes were upon issuance assigned a credit rating,
and the 9 1/4% Senior Notes were at that time assigned an upgraded credit
rating, by Standard & Poor's Ratings Group ("S&P") and Moody's Investors
Service, Inc.  ("Moody's") of BB and Ba2, respectively.  On August 30, 1996,
S&P assigned the 9 1/4% Senior Notes and the 9 1/8% Senior Notes an upgraded
credit rating of BB+.

REASONS FOR THE PROPOSED AMENDMENTS

         The Indenture contains certain restrictive covenants, including
limitations on additional indebtedness and the ability to secure such
indebtedness; restrictions on dividends and certain investments; and
limitations on sales of assets, sales and leasebacks, transactions with
affiliates, and mergers or consolidations.  Although the terms of the 9 1/8%
Senior Notes under the 1996 Indenture include the same types of restrictive
covenants, the limitations imposed under the 9 1/8% Senior Notes generally
provide the Company with greater financial flexibility, including with respect
to the ability to incur additional indebtedness and to secure such
indebtedness, as compared to the 9 1/4% Senior Notes.  In addition, effecting
the Proposed Amendments to make the definitions and covenants contained in the
Indenture consistent with those contained in the 1996 Indenture will reduce
administrative time and expenses associated with monitoring and maintaining
contractual compliance.

         The Company believes the financial flexibility provided under the 
9 1/8% Senior Notes is important to allow the Company to continue to pursue its
business strategy.  Unless the terms of the 9 1/4% Senior Notes are modified to
be consistent with the 9 1/8% Senior Notes in terms of the limitations
contained in the restrictive covenants, the terms of the 9 1/4% Senior Notes
will continue to be the limiting factors governing the Company's ability to,
among other things, incur additional indebtedness and secure such indebtedness.

         In addition, certain aspects of the Events of Default under the 1996
Indenture are less onerous than the corresponding provisions under the
Indenture.  See "-- Summary of Changes -- Events of Default Amendment."

         The Neddrill acquisition promoted the Company's historic and long-term
strategic goals of expanding its international presence and enhancing its
deepwater capabilities.  The Neddrill acquisition added deepwater and harsh
environment capabilities to the Company's fleet, diversified the fleet to
include drillships and a semisubmersible and increased the Company's geographic
diversification by providing entry into the Brazilian offshore market and
expanding its presence in the North Sea.  The issuance of 26,850,000 shares of
Common Stock of the Company (including the 5,000,000 shares issued to Nedlloyd)
in connection with the acquisition strengthened the Company's balance sheet and
minimized the effects of leverage attributable to the issuance of an additional
$125,000,000 principal amount of long-term debt.

SUMMARY OF CHANGES

         Set forth below is a summary of the changes in the Indenture that
would be effected by the Proposed Amendments.  This summary does not purport to
be complete and is qualified in its entirety by the more complete information
set forth elsewhere in this Consent Solicitation Statement and in the Annexes
hereto.  Holders of 9 1/4% Senior Notes should carefully review this entire
Consent Solicitation Statement and the Annexes hereto, including the form of
First Supplemental Indenture attached as Annex I.

o        AMENDMENT OF CERTAIN EXISTING, AND ADDITION OF NEW, DEFINED TERMS.
         The Proposed Amendments would amend certain defined terms contained in
         Section 1.01 of the Indenture and add certain new defined terms to
         Section 1.01 of the Indenture.  The full text of the new defined terms
         is set forth in Section 1.1(a) of the First Supplemental Indenture
         attached to this Consent Solicitation Statement as Annex I.  The full





                                       7
<PAGE>   8
         text of the amended defined terms is set forth in Section 1.1(b) of
         the First Supplemental Indenture attached to this Consent Solicitation
         Statement as Annex I.  The full text of these amended defined terms,
         marked to show changes, is also included in this Consent Solicitation
         Statement in Annex II.

o        LIMITATION ON TRANSACTIONS WITH AFFILIATES AMENDMENT.  The Proposed
         Amendments would modify the Limitation on Transactions with Affiliates
         covenant contained in Section 10.07 of the Indenture to eliminate the
         requirement that, with respect to a transaction or series of related
         transactions that has a Fair Market Value equal to, or in excess of,
         $20,000,000 entered into with an Affiliate of the Company, the Company
         deliver to the Trustee an opinion of a nationally recognized
         investment banking firm to the effect that such transaction or series
         of related transactions is on terms no less favorable to the Company
         or a Subsidiary than those that could be obtained in a comparable
         arm's length transaction with a Person that is not such an Affiliate.
         Any such transaction or series of related transactions that has a Fair
         Market Value of $20,000,000 or less (but equal to at least $5,000,000)
         would continue to require approval by a majority of the Board of
         Directors of the Company and certification of compliance with the
         covenant by means of a Board Resolution.  The full text of amended
         Section 10.07, marked to show changes, is included in this Consent
         Solicitation Statement in Annex II.

o        LIMITATION ON RESTRICTED PAYMENTS AMENDMENT.  The Proposed Amendments
         would modify the Limitation on Restricted Payments covenant contained
         in Section 10.08 of the Indenture to give the Company credit, in terms
         of the calculation of the permissible amount of Restricted Payments
         that can be made by the Company and its Subsidiaries, for certain
         additional amounts.  Currently, Section 10.08 gives credit for the
         carrying value of any Redeemable Stock that has been converted into,
         exchanged for or satisfied by the issuance of shares of Capital Stock
         (other than Redeemable Stock) of the Company subsequent to October 7,
         1993.  The Proposed Amendments expand this provision to give credit
         also for the carrying value of any shares of $1.50 Convertible
         Preferred Stock of the Company (the "Preferred Stock") that have been
         converted into, exchanged for or satisfied by the issuance of shares
         of Capital Stock (other than Redeemable Stock) of the Company
         subsequent to October 7, 1993.  The Preferred Stock is not redeemable
         prior to December 31, 1996.  On or after such date, the Preferred
         Stock is redeemable at the option of the Company, in whole or part, at
         $26.05 per share if redeemed prior to December 31, 1997, and at prices
         decreasing in increments of $0.15 per year to $25.00 per share on and
         after December 31, 2003, plus accrued and unpaid dividends to the
         redemption date.  Each share of the Preferred Stock is convertible, at
         the option of the holder at any time, into 2.4446 shares of Common
         Stock of the Company (subject to adjustment in certain circumstances).
         The carrying value of the Preferred Stock at June 30, 1996 was
         approximately $105,000,000.

         The Proposed Amendments would also add an additional component in the
         calculation of the permissible amount of Restricted Payments.  In the
         case of the disposition or repayment of any Investment constituting a
         Restricted Payment made after July 1, 1996 in compliance with Section
         10.08 and the other provisions of the Indenture, an amount equal to
         the lesser of the return of capital with respect to such Investment
         and the initial amount of such Investment, in either case, minus the
         cost of the disposition of such Investment, would be included in the
         calculation of the permissible amount of Restricted Payments.

         The Proposed Amendments to Section 10.08 would also provide that
         payments of regular dividends on the Preferred Stock, which by
         definition are Restricted Payments, would be excepted from the terms
         of Section 10.08 that otherwise could prevent their payment, and that
         the aggregate amount of dividends paid by the Company pursuant to such
         exception would not be included in subsequent computations under
         subsection (a) of Section 10.08.

         The full text of amended Section 10.08, marked to show changes, is
         included in this Consent Solicitation Statement in Annex II.

o        LIMITATION ON SUBSIDIARY INDEBTEDNESS AND PREFERRED STOCK AMENDMENT.
         The Proposed Amendments would modify the Limitation on Subsidiary
         Indebtedness and Preferred Stock covenant contained in Section 10.10
         of the Indenture to permit any Subsidiary of the Company (i) to incur
         Indebtedness which is "Project





                                       8
<PAGE>   9
         Finance Indebtedness", as such defined term is amended by the Proposed
         Amendments, and (ii) to exclude from the calculation of the amount of
         Indebtedness or preferred stock of such Subsidiary that it can incur
         without exceeding the permitted 10 percent of the Company's
         Consolidated Net Tangible Assets, Indebtedness secured by Liens
         described under clauses (xv) and (xix) of the definition of "Permitted
         Liens", as such defined term is amended by the Proposed Amendments.
         Clause (xv) of such definition covers Liens granted by a Non-Recourse
         Subsidiary securing Non-Recourse Indebtedness of such Non-Recourse
         Subsidiary and Liens on the Capital Stock of a Non-Recourse Subsidiary
         securing Non-Recourse Indebtedness of such Non-Recourse Subsidiary;
         and clause (xix) of such definition covers Liens on (a) up to eight
         submersible drilling rigs, owned by the Company or any Subsidiaries as
         of July 1, 1996 including any improvements on such rigs, provided,
         that the Company may from time to time designate one or more of such
         rigs as Property that is not, and will not be, subject to such clause
         (xix) by delivery of written notice of such designation to the
         Trustee, whereupon such designated rig or rigs shall cease to be
         covered by such clause (xix) and, if unencumbered by any Lien (other
         than Permitted Liens described in clauses (vii), (viii) and (ix) of
         the definition of Permitted Liens), the Appraised Value of such
         designated rig or rigs as of any Measurement Date shall be included in
         any determination of Consolidated Asset Coverage Ratio under the
         Indenture or (b) the Property described in clause (ii)(l) of the
         definition of "Asset Sale" in the 1996 Indenture.  The full text of
         amended Section 10.10, marked to show changes, is included in this
         Consent Solicitation Statement in Annex II.

o        AMENDMENT TO ADD PROVISION SUSPENDING CERTAIN COVENANTS UPON
         ACHIEVEMENT OF INVESTMENT GRADE RATINGS.  The Proposed Amendments
         would add a new Section 10.19 to the Indenture to specifically provide
         that, during any period of time that (i) the ratings assigned to the 9
         1/4% Senior Notes by both S&P and Moody's are equal to or higher than
         BBB- and Baa3, or the equivalents thereof, respectively (the
         "Investment Grade Ratings"), and (ii) no Event of Default or Default
         has occurred and is continuing, the Company and its Subsidiaries would
         not be subject to the provisions of Section 10.08 and Section 10.09
         and clauses (3) and (4) of Section 8.01 of the Indenture
         (collectively, the "Suspended Covenants").  In the event that the
         Company is not subject to the Suspended Covenants for any period of
         time as a result of the preceding sentence and, subsequently, one or
         both of S&P or Moody's withdraws its ratings or downgrades the ratings
         assigned to the 9 1/4% Senior Notes below the required Investment
         Grade Ratings, then the Company and its Subsidiaries will again be
         subject to the Suspended Covenants and compliance with the Suspended
         Covenants with respect to Restricted Payments made after the time of
         such withdrawal or downgrade will be calculated in accordance with the
         terms of Section 10.08 as if such Section had been in effect during
         the entire period of time from July 1, 1996.  The full text of the new
         Section 10.19 is set forth in Section 1.5 of the First Supplemental
         Indenture.

o        EVENTS OF DEFAULT AMENDMENT.  The Proposed Amendments would modify the
         events that constitute Events of Default in four of the subsections of
         Section 5.01 of the Indenture as follows: (i) by increasing the
         threshold amount triggering a cross default under subsection (5) from
         "$5,000,000 for any single Indebtedness or in an aggregate amount in
         excess of $10,000,000 for all Indebtedness" to "$10,000,000 for any
         Indebtedness individually or in the aggregate", (ii) by increasing the
         threshold amount of an undischarged or unsatisfied judgment or order
         against the Company or any Subsidiary that would constitute a default
         under subsection (6) from $5,000,000 to $10,000,000, (iii) by changing
         the debtor relief provisions in subsection (7) to be applicable to a
         "Material Subsidiary" instead of a "Subsidiary" and (iv) by changing
         the debtor relief provisions in subsection (8)(b) to be applicable to
         a "Material Subsidiary" instead of a "Subsidiary" in each instance
         where it is not currently so applicable.  The full text of the amended
         subsections (5), (6), (7) and (8) of Section 5.01, marked to show
         changes, is included in this Consent Solicitation Statement in Annex
         II.

INTEREST OF CERTAIN PERSONS IN THE PROPOSED AMENDMENTS

         As of the Record Date, none of the Company or, to the Company's
knowledge, any of its affiliates owned, beneficially or of record, any 9 1/4%
Senior Notes.  The Company has limited information concerning the beneficial
ownership of the 9 1/4% Senior Notes, because substantially all the 9 1/4%
Senior Notes are registered in the names





                                      9
<PAGE>   10
of nominees.  However, based on the Company's research, it believes that there
are approximately six organizations who each own 5 percent or more of the
aggregate principal amount of the Outstanding 9 1/4% Senior Notes.

                            THE CONSENT SOLICITATION

GENERAL

         The Company is soliciting Consents from Holders as of the Record Date,
upon the terms and subject to the conditions set forth herein and in the
accompanying form of Consent, to the execution of the First Supplemental
Indenture effecting the Proposed Amendments.  If the Required Consents are
received (and not revoked) prior to the Expiration Date and the other
conditions set forth herein (see "--Conditions of the Consent Solicitation")
are satisfied or waived, the Company will, promptly after the Expiration Date,
(i) execute the First Supplemental Indenture and (ii) pay to each Holder as of
the Record Date who has delivered (and not revoked) a valid Consent prior to
the Expiration Date the Consent Payment in respect of which such Consent has
been delivered. Pursuant to the terms of the First Supplemental Indenture, the
Proposed Amendments will become effective upon the execution thereof.
Thereafter, all current Holders, including non-consenting holders, and all
subsequent holders of 9 1/4% Senior Notes will be bound by the Proposed
Amendments.  If the Consent Solicitation is terminated for any reason, the
Consents will be voided, no Consent Payments will be made, and the Proposed
Amendments will not be effected.

         Participation in the Consent Solicitation is voluntary, and Holders as
of the Record Date should consider carefully whether to consent to the Proposed
Amendments.  Holders as of the Record Date are urged to consult their financial
and tax advisors in making their own decision on what action to take with
respect to the Proposed Amendments and the characterization for income tax
purposes of any Consent Payment received.

         All costs of the Consent Solicitation, including the Consent Payments,
will be paid by the Company.

REQUIRED CONSENTS

         Pursuant to the terms and conditions of this Consent Solicitation,
Holders as of the Record Date must grant (and not revoke) valid Consents in
respect of a majority in aggregate principal amount of the Outstanding 9 1/4%
Senior Notes (the "Required Consents") in order to approve the Proposed
Amendments.  As of the Record Date, $125,000,000 aggregate principal amount of
9 1/4% Senior Notes were Outstanding.

         The failure of any Holder as of the Record Date in respect of a 9 1/4%
Senior Note to deliver a Consent will have the same effect as if such Holder
had voted against the Consent Solicitation.

EXPIRATION DATE; EXTENSIONS; AMENDMENT

         The term "Expiration Date" means 5:00 P.M., New York City time, on
Friday, September 27, 1996, unless the Company, in its sole discretion, extends
the period during which the Consent Solicitation is open, in which event the
term "Expiration Date" means the latest time and date to which the Consent
Solicitation is so extended.  The Company reserves the right to extend the
Consent Solicitation at any time and from time to time, whether or not the
Required Consents have been received, by giving oral (confirmed in writing) or
written notice to the Information Agent and the Depositary no later than 5:00
P.M., New York City time, on or before the next business day after the
previously announced Expiration Date.  Any such extension will be followed as
promptly as practicable by notice thereof by press release or other public
announcement or by written notice to the Holders of 9 1/4% Senior Notes.  Such
announcement or notice may state that the Company is extending the Consent
Solicitation for a specified period of time or on a daily basis until 5:00
P.M., New York City time, on the date on which the Required Consents have been
received.

         The Company expressly reserves the right, in its sole discretion,
subject to applicable law, (i) to terminate the Consent Solicitation at any
time and for any reason by giving notice to the Information Agent and the
Depositary, (ii) to amend the terms of the Consent Solicitation, (iii) to
modify the form or amount of the





                                       10
<PAGE>   11
consideration to be paid pursuant to the Consent Solicitation and (iv) not to
extend the Consent Solicitation beyond the original Expiration Date or any date
to which the Consent Solicitation has been previously extended, whether or not
the Required Consents have been received by such date.  Any termination,
waiver, extension, amendment or modification applicable to the Consent
Solicitation will apply to all Outstanding 9 1/4% Senior Notes.

         If the Consent Solicitation is amended or modified in a manner
determined by the Company to constitute a material change to the Holders, the
Company will promptly disclose such amendment or modification by written notice
to the Holders as of the Record Date of the 9 1/4% Senior Notes and in a public
announcement, and the Company will extend the Consent Solicitation for a period
deemed by the Company to be adequate to permit eligible Holders of the
Outstanding 9 1/4% Senior Notes to execute and deliver or revoke their
Consents.  Without limiting the manner in which the Company may choose to make
a public announcement of any extension, amendment, termination or modification
of the Consent Solicitation, the Company expects to make any such public
announcement through a timely release to the Dow Jones News Service and will
comply with any applicable notice provisions of the Indenture.

         Subject to the foregoing, if properly completed and executed Consents
sufficient to permit execution of the First Supplemental Indenture are received
(and not revoked), the Company intends to effect the Proposed Amendments.

CONSENT PAYMENTS

         In the event the First Supplemental Indenture is executed by the
Company and the Trustee, thereby effecting the Proposed Amendments, the Company
will pay to each Holder as of the Record Date, and only such Holders, $3.75 in
cash for each $1,000 in principal amount of Outstanding 9 1/4% Senior Notes as
to which a valid and unrevoked Consent has been given prior to the Expiration
Date.  No interest will accrue or be payable on the Consent Payments.

         A Holder as of the Record Date of 9 1/4% Senior Notes in respect of
which there has been delivered to the Depositary a valid and unrevoked Consent
prior to the Expiration Date will be entitled to receive the Consent Payment if
the other conditions for payment described herein have been satisfied or
waived.  If a Holder as of the Record Date of 9 1/4% Senior Notes in respect of
which such Holder has delivered a Consent transfers after the Record Date such
9 1/4% Senior Notes, the Consent Payments with respect to such transferred 9
1/4% Senior Notes will be made, notwithstanding such transfer, to the Holder as
of the Record Date, unless the Consent with respect to such transferred 9 1/4%
Senior Notes has been revoked by the Holder as of the Record Date prior to the
Expiration Date.  The Consent Payment will be made only to consenting Holders
as of the Record Date in respect of which there has been timely received a
valid and unrevoked Consent.  Holders as of the Record Date of 9 1/4% Senior
Notes who timely revoke their Consents to the Proposed Amendments will not be
entitled to receive Consent Payments even though the Proposed Amendments, if
effected in accordance with the terms hereof, will be binding on them.

         As described below, the Company's obligation to make Consent Payments
is contingent upon receipt of the Required Consents, execution of the First
Supplemental Indenture and effectiveness of the Proposed Amendments.  Consent
Payments will be made promptly after the Expiration Date by check mailed to the
respective addresses of the Holders of 9 1/4% Senior Notes entitled to receive
Consent Payments as such addresses appear in the Security Register as of the
Record Date or to such other addresses as indicated by such Holders on their
respective Consents.

         Beneficial owners whose 9 1/4% Senior Notes are registered, as of the
Record Date, in the name of a broker, dealer, commercial bank, trust company or
other nominee institution should contact such broker, dealer, commercial bank,
trust company or other nominee institution promptly and instruct such person,
as the Holder of such 9 1/4% Senior Notes as of the Record Date, to execute and
deliver a Consent on behalf of such beneficial owner prior to the Expiration
Date in order to receive the Consent Payment.





                                       11
<PAGE>   12
FAILURE TO OBTAIN REQUIRED CONSENTS

         In the event the Required Consents are not obtained or the Consent
Solicitation is otherwise terminated, no Consent Payments will be made and the
Proposed Amendments will not be effected.

CONSENT PROCEDURES

         This Consent Solicitation Statement is being sent to all Holders as of
the Record Date of 9 1/4% Senior Notes.  Only a Holder as of the Record Date
(or such Holder's legal representatives) may execute and deliver a Consent, and
unless revoked prior to the Expiration Date by the Holder as of the Record
Date, such Consent will be binding on all subsequent transferees of such
Holder's 9 1/4% Senior Notes in respect of which the Consent was given.  A
beneficial owner as of the Record Date of 9 1/4% Senior Notes who is not the
Holder of such 9 1/4% Senior Notes (e.g., a beneficial owner whose 9 1/4%
Senior Notes are registered in the name of a broker, dealer, commercial bank,
trust company or other nominee institution) must either (i) arrange for such
Holder as of the Record Date to execute a Consent and deliver it either to the
Depositary on behalf of such beneficial owner or to such beneficial owner for
forwarding to the Depositary by such beneficial owner, or (ii) obtain from such
Holder as of the Record Date a duly executed proxy authorizing such beneficial
owner to act on behalf of such Holder as to such 9 1/4% Senior Notes.  For
purposes of the Consent Solicitation, the term "Holder" shall be deemed to
include the DTC Participants through which a beneficial owner's 9 1/4% Senior
Notes are held on the Record Date with DTC.  DTC has authorized DTC
Participants to execute Consents as if they were Holders.

         All Consents that are properly completed, signed and received by the
Depositary, and not revoked, prior to the Expiration Date, will be given effect
in accordance with the specifications thereof.  Holders who desire to consent
to the Proposed Amendments should complete, sign and date the Consent included
herewith (including the Form W-9 attached thereto) and mail, hand deliver, send
by overnight courier or fax (faxes should be confirmed by physical delivery)
the signed Consent (including the completed Form W-9 attached thereto) to the
Depositary at the address listed on the Consent, all in accordance with the
instructions contained herein and therein.  CONSENTS SHOULD BE DELIVERED TO THE
DEPOSITARY, NOT TO THE COMPANY OR THE INFORMATION AGENT.  HOWEVER, THE COMPANY
RESERVES THE RIGHT TO ACCEPT ANY CONSENT RECEIVED BY IT OR THE INFORMATION
AGENT.

         The method of delivery of Consents is at the election and risk of the
consenting Holders.  If delivery is by mail, registered mail with return
receipt requested is recommended and enough time should be allowed to ensure
timely delivery.  If delivery is by fax, such fax must be confirmed by
subsequent physical delivery to the Depositary.

         HOLDERS OF 9 1/4% SENIOR NOTES SHOULD NOT TENDER OR DELIVER 9 1/4%
SENIOR NOTES TO THE COMPANY, THE INFORMATION AGENT OR THE DEPOSITARY AT ANY
TIME.

         If a Consent relates to fewer than all the 9 1/4% Senior Notes
registered in the name of the Holder providing such Consent, such Holder must
indicate on the Consent the aggregate dollar amount of the Holder's 9 1/4%
Senior Notes to which the Consent relates.  Otherwise the Consent will be
deemed to relate to all 9 1/4% Senior Notes held in the name of such Holder as
of the Record Date.

         Consents by the Holders as of the Record Date of the 9 1/4% Senior
Notes must be executed in exactly the same manner as such Holders' names appear
on the 9 1/4% Senior Notes.  If 9 1/4% Senior Notes to which a Consent relates
are held of record by two or more joint holders, all such holders must sign the
Consent.  If a Consent is signed by a trustee, partner, executor,
administrator, guardian, attorney-in-fact, officer of a corporation, or other
person acting in a fiduciary or representative capacity, such person must so
indicate when signing and must submit with the Consent appropriate evidence of
authority to execute the Consent.  If 9 1/4% Senior Notes are registered in
different names, separate Consents must be executed covering each form of
registration.  If a Consent is executed by a person other than the Holder, then
it must be accompanied by a proxy duly executed by the Holder.





                                       12
<PAGE>   13
         The registered ownership of Holders as of the Record Date of a 9 1/4%
Senior Note shall be proved by the Security Register maintained by the Trustee,
as registrar of the 9 1/4% Senior Notes.  All questions as to the validity,
form, eligibility (including time of receipt) for Consent Payments, and
revocation of Consents with respect to 9 1/4% Senior Notes will be determined
by the Company in its sole discretion, which determination will be conclusive
and binding subject only to such formal review as may be required by the
Trustee concerning proof of ownership and as may be required by the Depositary
regarding proof of execution.  The Company reserves the absolute right to
reject any or all Consents that are not in proper form or the acceptance of
which could, in the opinion of the Company or its counsel, be unlawful.  The
Company also reserves the right, subject to such final review as the Trustee
and the Depositary require for proof of execution and ownership, to waive any
defects or irregularities in connection with deliveries of particular Consents.
Unless waived, any defects or irregularities in connection with deliveries of
Consents must be cured within such time as the Company determines.  None of the
Company, any of its affiliates, the Information Agent, the Depositary, the
Trustee or any other person will be under any duty to give any notification of
any such defects, irregularities or waiver, nor shall any of them incur any
liability for failure to give such notification. Deliveries of Consents will
not be deemed to have been made until any irregularities or defects therein
have been cured or waived.  The Company's interpretation of the terms and
conditions of this Consent Solicitation shall be conclusive and binding.

REVOCATION OF CONSENTS

         The transfer of 9 1/4% Senior Notes will not have the effect of
revoking any Consent theretofore validly given by a Holder as of the Record
Date of such 9 1/4% Senior Notes, and each properly completed and executed
Consent will be counted, notwithstanding any transfer after the Record Date of
the 9 1/4% Senior Notes to which such Consent relates, unless the procedure for
revocation of Consents described below has been complied with.  A Consent or a
revocation of a Consent (a "Revocation of Consent") delivered by a Holder as of
the Record Date of 9 1/4% Senior Notes prior to the Expiration Date shall be
deemed to supersede any earlier Consents or Revocations of Consent relating to
the same 9 1/4% Senior Notes.

         At any time prior to (but not after) the Expiration Date, any Holder
as of the Record Date may revoke any Consent given as to its 9 1/4% Senior
Notes or any portion of such 9 1/4% Senior Notes (in integral multiples of
$1,000).  A Holder as of the Record Date who desires to revoke a Consent must,
prior to the Expiration Date, complete, date and sign the form of Revocation of
Consent included herein and mail, hand deliver, send by overnight courier, or
fax (faxes should be confirmed by physical delivery) the signed Revocation of
Consent to the Depositary at the address listed on the Revocation of Consent,
all in accordance with the instructions contained herein and therein.  Consents
may be revoked at any time up to, but will become irrevocable at, the
Expiration Date.  Revocation of Consents shall be effective upon receipt of
such written revocation by the Depositary.

         The Revocation of Consent must be executed by the Holder as of the
Record Date in exactly the same manner as such Holder's name appears on the
Consent to which the Revocation of Consent relates.  If a Revocation of Consent
is signed by a trustee, partner, executor, administrator, guardian,
attorney-in-fact, officer of a corporation, or other person acting in a
fiduciary or representative capacity, such person must so indicate when signing
and must submit with the Revocation of Consent appropriate evidence of
authority to execute the Revocation of Consent.

         Only a Holder as of the Record Date of 9 1/4% Senior Notes is entitled
to revoke a Consent previously given.  A beneficial owner as of the Record Date
of 9 1/4% Senior Notes who is not the Holder of such 9 1/4% Senior Notes (e.g.,
a beneficial owner whose 9 1/4% Senior Notes are registered in the name of a
broker, dealer, commercial bank, trust company or other nominee institution)
who desires to revoke a Consent given with respect to such 9 1/4% Senior Notes
must either (i) arrange with such Holder as of the Record Date to execute a
Revocation of Consent with respect to such 9 1/4% Senior Notes and deliver it
either to the Depositary on such beneficial owner's behalf or to such
beneficial owner for forwarding to the Depositary by such beneficial owner, or
(ii) obtain from such Holder as of the Record Date a duly executed proxy
authorizing such beneficial owner to act on behalf of the Holder as to such 9
1/4% Senior Notes.





                                       13
<PAGE>   14
         A Revocation of Consent may be rescinded only by the execution and
delivery of a new Consent.  A Holder as of the Record Date who has delivered a
Revocation of Consent may thereafter deliver a new Consent by following one of
the prescribed procedures at any time prior to the Expiration Date.

         The Company reserves the right to contest the validity of any
Revocation of Consent, and all questions as to validity (including time of
receipt) of any Revocation of Consent will be determined by the Company in its
sole discretion, which determination will be conclusive and binding subject
only to such final review as may be required by the Trustee concerning proof of
ownership and as may be required by the Depositary regarding proof of
execution.  None of the Company, any of its affiliates, the Information Agent,
the Depositary, the Trustee or any other person will be under any duty to give
notification of any defects or irregularities with respect to any Revocation of
Consent nor shall any of them incur any liability for failure to give such
notification.

CONDITIONS OF THE CONSENT SOLICITATION

         The Consent Solicitation may be terminated by the Company at any time
prior to the effectiveness of the First Supplemental Indenture, whether before
or after obtaining the Required Consents or before or after the Expiration
Date, for any reason, by giving the notice described above under "--Expiration
Date; Extensions; Amendment," in which case all Consents will be voided and no
Consent Payments will be made.  Execution of the First Supplemental Indenture
is conditioned upon receipt of the Required Consents and upon delivery of
certain documents to the Trustee by the Company as provided in the Indenture.
The effectiveness of the First Supplemental Indenture and the Company's
obligation to make Consent Payments are each conditioned upon receipt of the
Required Consents and execution of the First Supplemental Indenture.

THE INFORMATION AGENT AND THE DEPOSITARY

         The Company has retained Corporate Investor Communications, Inc. as
Information Agent (the "Information Agent") in connection with the Consent
Solicitation.  The Information Agent will solicit Consents and will be
responsible for responding to inquiries regarding the Consent Solicitation.

         The Company has retained Texas Commerce Bank National Association,
which is also the Trustee under the Indenture, as Depositary in connection with
the Consent Solicitation.  The Depositary will be responsible for collecting
Consents.

         Requests for assistance in filling out and delivering Consents or
requests for additional copies of this Consent Solicitation Statement or the
form of Consent may be directed to the Information Agent at its address and
telephone number set forth on the back cover page of this Consent Solicitation
Statement.





                                       14
<PAGE>   15
                           NOBLE DRILLING CORPORATION

                                    CONSENT

         Pursuant to the solicitation by Noble Drilling Corporation (the
"Company") of consents, upon the terms and subject to the conditions in the
Consent Solicitation Statement dated September 6, 1996 (the "Consent
Solicitation Statement"), to the execution of a First Supplemental Indenture
effecting certain amendments to the Indenture dated as of October 1, 1993 (the
"Indenture") between the Company and Texas Commerce Bank National Association,
as trustee (the "Trustee"), governing the Company's 9 1/4% Senior Notes Due
2003 (the "9 1/4% Senior Notes"), the undersigned hereby consents to the
amendments set forth in, and the execution of, the First Supplemental Indenture
attached to the Consent Solicitation Statement as Annex I in respect of the 9
1/4% Senior Notes indicated below.

         By execution hereof, the undersigned acknowledges receipt of the
Consent Solicitation Statement.  Capitalized terms used herein but not defined
herein have the meaning given to them in the Consent Solicitation Statement.
The Consent Solicitation and the payment of the Consent Payment with respect to
the 9 1/4% Senior Notes is conditioned on, among other things, there being
received (and not revoked) prior to the Expiration Date, the Required Consents
to the Proposed Amendments.

         Only a Holder as of the Record Date (or such Holder's legal
representatives) may execute and deliver a Consent, and unless revoked prior to
the Expiration Date by the Holder as of the Record Date, such Consent will be
binding on all subsequent transferees of such Holder's 9 1/4% Senior Notes in
respect of which the Consent was given.  Any beneficial owner as of the Record
Date of 9 1/4% Senior Notes who is not the Holder of such 9 1/4% Senior Notes
must arrange with the person who is the Holder as of the Record Date or such
Holder's assignee or nominee to execute and deliver a Consent on behalf of such
beneficial owner.  For purposes of the Consent Solicitation, the term "Holder"
shall be deemed to include the participants (the "DTC Participants") through
which a beneficial owner's 9 1/4% Senior Notes are held on the Record Date with
The Depository Trust Company ("DTC").  DTC has authorized DTC Participants to
execute Consents as if they were Holders.

         Unless otherwise indicated under "Special Payment Instructions,"
please issue a check in payment of any fees due to the undersigned.  Similarly,
unless otherwise indicated under "Special Delivery Instructions," please send
any such check to the undersigned at the undersigned's address shown below.

         PLEASE COMPLETE THE CONSENT AND THE FORM W-9 ATTACHED HERETO AND
RETURN THEM VIA CERTIFIED OR REGISTERED MAIL, HAND DELIVERY, OVERNIGHT COURIER
OR FACSIMILE (CONFIRMED BY TELEPHONE AND THEREAFTER PHYSICAL DELIVERY), PRIOR
TO 5:00 P.M., NEW YORK CITY TIME, ON FRIDAY, SEPTEMBER 27, 1996, UNLESS
EXTENDED, TO TEXAS COMMERCE BANK NATIONAL ASSOCIATION, AS DEPOSITARY, AT (A) IF
BY MAIL OR COURIER, 55 WATER STREET, NORTH BUILDING, ROOM 234, WINDOWS 20 AND
21, NEW YORK, NEW YORK 10041, ATTENTION: CORPORATE TRUST SERVICES, OR 1201 MAIN
STREET, 18TH FLOOR, DALLAS, TEXAS  75202, OR 600 TRAVIS STREET, 8TH FLOOR,
HOUSTON, TEXAS  77002, ATTENTION: GLOBAL TRUST SERVICES--NOBLE DRILLING, (B) IF
BY HAND DELIVERY, 55 WATER STREET, NORTH BUILDING, ROOM 234, WINDOWS 20 AND 21,
NEW YORK, NEW YORK 10041, ATTENTION: CORPORATE TRUST SERVICES, OR 1201 MAIN
STREET, 18TH FLOOR, DALLAS, TEXAS  75202 AND (C) IF BY FACSIMILE, (214)
672-5744, ATTENTION: FRANK IVINS, CONFIRMED BY TELEPHONE AT (214) 672-5678.
THE METHOD OF DELIVERY OF ALL DOCUMENTS IS AT THE ELECTION AND RISK OF THE
HOLDER.





                                      C-1
<PAGE>   16
                                    CONSENT

                      DESCRIPTION OF 9 1/4% SENIOR NOTES

<TABLE>
<CAPTION>
Name(s) and Address(es)           Aggregate Principal           Serial                  DTC Participant
of Registered Holders             Amount of Senior Notes        Number(s)               Number          
- ---------------------             ----------------------        ---------------         ----------------
<S>                               <C>                           <C>                     <C>





- --------------------------------------------------------------------------------------------------------
</TABLE>

                                  SIGN BELOW

<TABLE>
<S>                                                                 <C>
                                                                                                                         
- ----------------------------------------------                      -----------------------------------------------------
Signature of Owner*                                                                    Signature of Owner*
                                                                                       (if more than one)

Must be signed by registered
holder(s) exactly as name(s)
appears on the 9 1/4% Senior Notes.



Dated:              , 1996                                          Tax ID#
       -------------                                                       ----------------------------------------------
                                                                    Telephone 
                                                                             --------------------------------------------
</TABLE>

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

*   Your signature must be guaranteed by an eligible guarantor institution
    (bank, broker, national securities exchange, registered securities
    association, clearing agency, savings association or credit union with
    membership in an approved signature guarantee medallion program) pursuant
    to Rule 17Ad-15 promulgated under the Securities Exchange Act of 1934.
    However, signatures need not be guaranteed if (i) this Consent is signed by
    the Holder as of the Record Date of the 9 1/4% Senior Notes and such Holder
    has not completed either the "Special Payment Instructions" or "Special
    Delivery Instructions" on this Consent or (ii) this Consent is given by or
    for the account of an above-described eligible guarantor institution.





                                      C-2
<PAGE>   17
                                    CONSENT

                          SPECIAL PAYMENT INSTRUCTIONS

(To be completed only if a check is to be issued in the name of someone other
than the Holder as of the Record Date of the 9 1/4% Senior Notes.)


Please issue a check in the name of:

Name: 
      -------------------------------------

Address: 
         ----------------------------------


         ----------------------------------
         (include zip code)



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

                         SPECIAL DELIVERY INSTRUCTIONS

(To be completed only if a check is to be mailed to someone other than the
Holder as of the Record Date of the 9 1/4% Senior Notes.)

Please send a check to:

Name: 
      -------------------------------------

Address: 
         ----------------------------------


         ----------------------------------
         (include zip code)





                                      C-3
<PAGE>   18
                           IMPORTANT TAX INFORMATION

         Under the United States federal income tax law, the Depositary may be
required to withhold 31 percent of the amount of any Consent Payment.  In order
to avoid "backup withholding," a Holder is required to provide the Depositary
with such Holder's current Taxpayer Identification Number ("TIN") on Substitute
Form W-9.  If such Holder is an individual, the TIN is his or her social
security number.  If the Depositary is not provided with the correct TIN or an
adequate basis for exemption, the Holder may be subject to a $50 penalty
imposed by the Internal Revenue Service.  In addition, any cash payment made to
a Holder may be subject to backup withholding.

         Certain Holders (including, among others, all corporations and certain
foreign individuals) are not subject to these backup withholding and reporting
requirements.  In order for a foreign individual to qualify as an exempt
recipient, that Holder must submit a Form W-8, signed under penalties of
perjury, attesting to that individual's exempt status.  A Form W-8 can be
obtained from the Depositary.  See the enclosed Instructions for Certification
of Taxpayer Identification Number for additional instructions.

         If backup withholding applies, the Depositary is required to withhold
31 percent of any cash payment made to the Holder.  Backup withholding is not
an additional federal income tax.  Rather, the tax liability of a person
subject to backup withholding will be reduced by the amount of tax withheld.
If withholding results in an overpayment of taxes, a refund may be obtained
from the Internal Revenue Service.

PURPOSE OF SUBSTITUTE FORM W-9

         To prevent backup withholding, the Holder is required to notify the
Depositary of his or her correct TIN by the Substitute Form W-9 and certify
that the TIN provided on Substitute Form W-9 is correct (or that such Holder is
awaiting a TIN) and that the Holder is not otherwise subject to backup
withholding.  In addition, the holder must complete Part 2 of the Substitute
W-9, check the appropriate box, and date and sign the Form W-9 as indicated.

WHAT NUMBER TO GIVE THE DEPOSITARY

         The Holder is required to give the Depositary the social security
number or employer identification number of the record owner of the 9 1/4%
Senior Notes.  If the notes are in more than one name or are not in the name of
the actual owner, consult the enclosed Instructions for Certification of
Taxpayer Identification Number for additional guidance on which number to
report.





                                      C-4
<PAGE>   19
                                    FORM W-9

             PAYOR'S NAME: TEXAS COMMERCE BANK NATIONAL ASSOCIATION


<TABLE>
   <S>                            <C>
- -------------------------------------------------------------------------------------------------------------------------------
   SUBSTITUTE                     PART 1 -- PLEASE PROVIDE YOUR TIN IN THE             Social Security Number
   FORM W-9                       BOX AT RIGHT AND CERTIFY BY SIGNING AND     OR                                      
                                  DATING BELOW.                                  -------------------------------------
                                                                                    Employer Identification Number
                               ------------------------------------------------------------------------------------------------
                                  PART 2 -- Check the box below.  I am (we are) NOT subject to backup withholding
                                  under the Internal Revenue Code because (a) I am (we  are) exempt from backup
                                  withholding, or (b) I (we) have not been notified that I am (we  are) subject to
                                  backup withholding as a result of a failure to report all interest or dividends, or
                                  (c) the Internal Revenue Service has notified me (us) that I am (we are) no longer
                                  subject to backup withholding.
                                                   [ ] Correct                       [ ] Not Correct
                               ------------------------------------------------------------------------------------------------
                                  CERTIFICATION -- UNDER PENALTIES OF PERJURY, I CERTIFY     PART 3 --
       PAYOR'S REQUEST FOR        THAT THE INFORMATION PROVIDED ON THIS FORM IS TRUE,
     TAXPAYER IDENTIFICATION      CORRECT AND COMPLETE.                                             [ ] Awaiting TIN
          NUMBER ("TIN")          Signature:                                               
                                             ----------------------------------------------
                                  Date:                                     , 199       
                                        ------------------------------------     ---    
                                                                                      
                                                                                    
- -------------------------------------------------------------------------------------------------------------------------------
</TABLE>

         For assistance in completing this form, see "Important Tax
Information" and the enclosed "Instructions for Certification of Taxpayer
Identification Number."


NOTE: FAILURE TO COMPLETE AND RETURN THIS FORM TO THE DEPOSITARY MAY RESULT IN
BACKUP WITHHOLDING OF 31 PERCENT OF ANY CASH PAYMENT MADE TO YOU, AND A $50
PENALTY MAY BE IMPOSED BY THE INTERNAL REVENUE SERVICE.  PLEASE REVIEW THE
ENCLOSED "INSTRUCTIONS FOR CERTIFICATION OF TAXPAYER IDENTIFICATION NUMBER" FOR
ADDITIONAL DETAILS.  YOU MUST COMPLETE THE FOLLOWING CERTIFICATE IF YOU CHECKED
THE BOX IN PART 3 OF THE SUBSTITUTE FORM W-9 ABOVE.


            CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER

I certify under penalties of perjury that a taxpayer identification number has
not been issued to me and (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 because
I have not provided a taxpayer identification number, 31% of all reportable
payments made to me hereafter will be withheld until I provide such a number.

                                                                        , 199   
- ------------------------------------------     -------------------------     ---
Signature                                      Date





                                      C-5
<PAGE>   20
                           NOBLE DRILLING CORPORATION

                             REVOCATION OF CONSENT

         Pursuant to the solicitation by Noble Drilling Corporation (the
"Company") of consents, upon the terms and subject to the conditions in the
Consent Solicitation Statement dated September 6, 1996 (the "Consent
Solicitation Statement"), to the execution of a First Supplemental Indenture
effecting certain amendments to the Indenture dated as of October 1, 1993 (the
"Indenture") between the Company and Texas Commerce Bank National Association,
as trustee (the "Trustee"), governing the Company's 9 1/4% Senior Notes Due
2003 (the "9 1/4% Senior Notes"), the undersigned hereby revokes consent to the
amendments set forth in, and the execution of, the First Supplemental Indenture
attached to the Consent Solicitation Statement as Annex I in respect of the 9
1/4% Senior Notes indicated below.

         By execution hereof, the undersigned acknowledges receipt of the
Consent Solicitation Statement.  Capitalized terms used herein but not defined
herein have the meaning given to them in the Consent Solicitation Statement.

         PLEASE COMPLETE THE REVOCATION OF CONSENT AND RETURN IT VIA CERTIFIED
OR REGISTERED MAIL, HAND DELIVERY, OVERNIGHT COURIER OR FACSIMILE (CONFIRMED BY
TELEPHONE AND THEREAFTER PHYSICAL DELIVERY), PRIOR TO 5:00 P.M., NEW YORK CITY
TIME, ON FRIDAY, SEPTEMBER 27, 1996, UNLESS EXTENDED, TO TEXAS COMMERCE BANK
NATIONAL ASSOCIATION, AS DEPOSITARY, AT (A) IF BY MAIL OR COURIER, 55 WATER
STREET, NORTH BUILDING, ROOM 234, WINDOWS 20 AND 21, NEW YORK, NEW YORK 10041,
ATTENTION: CORPORATE TRUST SERVICES, OR 1201 MAIN STREET, 18TH FLOOR, DALLAS,
TEXAS  75202, OR 600 TRAVIS STREET, 8TH FLOOR, HOUSTON, TEXAS  77002,
ATTENTION: GLOBAL TRUST SERVICES--NOBLE DRILLING, (B) IF BY HAND DELIVERY, 55
WATER STREET, NORTH BUILDING, ROOM 234, WINDOWS 20 AND 21, NEW YORK, NEW YORK
10041, ATTENTION: CORPORATE TRUST SERVICES, OR 1201 MAIN STREET, 18TH FLOOR,
DALLAS, TEXAS  75202 AND (C) IF BY FACSIMILE, (214) 672-5744, ATTENTION: FRANK
IVINS, CONFIRMED BY TELEPHONE AT (214) 672-5678.  THE METHOD OF DELIVERY OF ALL
DOCUMENTS IS AT THE ELECTION AND RISK OF THE HOLDER.





                                      R-1
<PAGE>   21
                             REVOCATION OF CONSENT

                      DESCRIPTION OF 9 1/4% SENIOR NOTES

<TABLE>
<CAPTION>
Name(s) and Address(es)           Aggregate Principal           Serial                  DTC Participant
of Registered Holders             Amount of Senior Notes        Number(s)               Number          
- ---------------------             ----------------------        ---------------         ----------------
<S>                               <C>                           <C>                     <C>






- --------------------------------------------------------------------------------------------------------
</TABLE>

                                  SIGN BELOW

<TABLE>
<S>                                                <C>                       <C>

                                                                                                                         
- ----------------------------------------------                      -----------------------------------------------------
Signature of Owner*                                                          Signature of Owner*
                                                                             (if more than one)

Must be signed by registered
holder(s) exactly as name(s)
appears on the 9 1/4% Senior Notes.


Dated:              , 1996                         Tax ID#                                                               
       -------------                                      ---------------------------------------------------------------
                                                   Telephone                                                             
                                                            -------------------------------------------------------------





                         
</TABLE>

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

*   Your signature must be guaranteed by an eligible guarantor institution
    (bank, broker, national securities exchange, registered securities
    association, clearing agency, savings association or credit union with
    membership in an approved signature guarantee medallion program) pursuant
    to Rule 17Ad-15 promulgated under the Securities Exchange Act of 1934.
    However, signatures need not be guaranteed if (i) this Revocation of
    Consent is signed by the Holder as of the Record Date of the 9 1/4% Senior
    Notes or (ii) this Revocation of Consent is given by or for the account of
    an above-described eligible guarantor institution.





                                      R-2
<PAGE>   22





             THE INFORMATION AGENT FOR THE CONSENT SOLICITATION IS:

                    CORPORATE INVESTOR COMMUNICATIONS, INC.
                               111 Commerce Road
                          Carlstade, New Jersey 07072
                           Attention:  Paul Schulman
                  Telephone: (201) 896-1900 or (800) 346-7885
                           Facsimile:  (201) 804-8693

         Any requests for assistance in filling out and delivering Consents or
requests for additional copies of this Consent Solicitation Statement or the
form of Consent may be directed to the Information Agent.




                THE DEPOSITARY FOR THE CONSENT SOLICITATION IS:

                    TEXAS COMMERCE BANK NATIONAL ASSOCIATION

<TABLE>
<S>                                        <C>                               <C>
Address for Deliveries by                  Facsimile Instructions:                   Address for Deliveries by Hand:
Mail or Courier:

55 Water Street                            Facsimile:  (214) 672-5744                55 Water Street
North Building, Room 234                   Attention:  Frank Ivins                   North Building, Room 234
Windows 20 and 21                                                                    Windows 20 and 21
New York, New York  10041                  Confirmed by Telephone:                   New York, New York  10041
Attention:  Corporate Trust                (214) 672-5678                            Attention:  Corporate Trust
            Services                                                                             Services
OR                                                                                   OR

1201 Main Street                                                                     1201 Main Street
18th Floor                                                                           18th Floor
Dallas, Texas  75202                                                                 Dallas, Texas  75202

OR

600 Travis Street, 8th Floor
Houston, Texas  77002
Attention:  Global Trust Services--
            Noble Drilling
</TABLE>

         Holders as of the Record Date of 9 1/4% Senior Notes who wish to
Consent and receive the Consent Payment should mail, hand deliver or send by
overnight courier or facsimile (confirmed by physical delivery) their properly
completed and executed Consents (including the completed Form W-9 attached
thereto) to the Depositary in order to be received prior to the Expiration
Date.
<PAGE>   23
                                                                         ANNEX I

================================================================================



                           NOBLE DRILLING CORPORATION

                                       to

                   TEXAS COMMERCE BANK NATIONAL ASSOCIATION,
                                    Trustee


                          FIRST SUPPLEMENTAL INDENTURE

                        Dated as of September ___, 1996

                                       to

                                   INDENTURE


                          Dated as of October 1, 1993

                                  $125,000,000

                          9 1/4% Senior Notes Due 2003

================================================================================
<PAGE>   24
                       FIRST SUPPLEMENTAL INDENTURE (the "Supplemental 
              Indenture"), dated as of September ___, 1996, between NOBLE
              DRILLING CORPORATION, a Delaware corporation (the "Company"), 
              and TEXAS COMMERCE BANK NATIONAL ASSOCIATION, as trustee (the
              "Trustee"), under an Indenture dated as of October 1, 1993 
              (the "Indenture").


                              W I T N E S S E T H:

         WHEREAS, Section 9.02 of the Indenture provides, among other things,
that, with the consent of the Holders of not less than a majority in principal
amount of the Outstanding Notes, by Act of said Holders delivered to the
Company and the Trustee, the Company, when authorized by a Board Resolution,
and the Trustee may enter into an indenture or indentures supplemental to the
Indenture for the purpose of adding any provisions to or changing in any manner
or eliminating any of the provisions of the Indenture or of modifying in any
manner the rights of the Holders;

         WHEREAS, all things necessary to make this Supplemental Indenture a
valid supplement to the Indenture in accordance with its terms have been done;

         WHEREAS, all capitalized terms used in this Supplemental Indenture
which are defined in the Indenture, either directly or by reference therein,
have the meanings ascribed to them therein, except to the extent such terms are
defined in this Supplemental Indenture or the context clearly requires
otherwise;

         NOW, THEREFORE, the parties hereto hereby agree as follows:

         Section 1.1.  Amendments of SECTION 1.01.  SECTION 1.01 of the
Indenture is amended:

         (a)     by adding the following definitions in appropriate
alphabetical order:

                 "Appraised Value" means (i) with respect to property,
         equipment, or other Consolidated Tangible Assets consisting of
         investments or other tangible financial assets (excluding cash, cash
         equivalents and investments in marketable securities) without a
         readily determinable market value, the Fair Value of such Properties
         as determined within 60 days of the date of the transaction giving
         rise to the need to calculate Appraised Value by means of a written
         appraisal or valuation report by a nationally recognized investment
         banking firm, independent appraisal firm or marine surveyor, in each
         case, (a) specializing in, or having a specialty in, valuing or
         appraising Property of the Company and the Subsidiaries of the type to
         be appraised or valued and (b) that is not an Affiliate of the
         Company, (ii) with respect to marketable securities of the Company and
         the Subsidiaries with a readily determinable market value, the market
         value of such assets, as determined within five trading days of the
         date of the transaction giving rise to the need to calculate Appraised
         Value, and as determined by reference to a published or otherwise
         readily accessible market data source selected in good faith by the
         Company, (iii) with respect to cash and cash equivalents of the
         Company and the Subsidiaries, the carrying value thereof reflected in
         the accounting records of the Company and (iv) with respect to all
         other Consolidated Tangible Assets of the Company and the
         Subsidiaries, the Fair Value of such assets, as determined in good
         faith by the Board of Directors; provided, however, that written
         appraisals or valuation reports shall not be required in respect of
         any Consolidated Tangible Assets of the Company and the Subsidiaries
         described in clause (i) of this definition to the extent that the
         Company determines in good faith the Fair Value of such unappraised or
         unvalued assets and the aggregate Fair Value of such assets does not
         exceed $25,000,000.

                 "Consolidated Asset Coverage Ratio" means as of the date of
         the transaction giving rise to the need to calculate the Consolidated
         Asset Coverage Ratio (the "Measurement Date") and after giving pro
         forma effect to the incurrence of any Project Finance Indebtedness on
         the Measurement Date, the ratio of (i) the aggregate Appraised Value
         of the Consolidated Tangible Assets of the Company (other than
         accounts receivable, inventory, and the Properties of the Company and
         its Subsidiaries described in this Section 1.01





                                       1
<PAGE>   25
         under clause (xix) of the definition of "Permitted Liens" as of the
         Measurement Date) that are not, and will not be, subject to any Lien
         (other than Permitted Liens of the type described in this Section 1.01
         under clauses (vii), (viii) and (ix) of the definition of "Permitted
         Liens") to (ii) the aggregate principal amount of the Notes plus the
         aggregate principal amount of unsecured Indebtedness of the Company
         and its Subsidiaries for borrowed money that is pari passu in right of
         payment to the Notes, in each case outstanding as of the Measurement
         Date.

                 "drilling rig" means any drillship, drilling ship,
         semisubmersible drilling unit, jackup or self-elevating drilling
         unit, submersible drilling unit, drilling barge or posted barge,
         platform drilling unit or land drilling rig or any other similar
         equipment used in oil, gas or other mineral or thermal well drilling
         or workover operations.

                 "Equity Offerings" has the meaning specified on the cover page
         of those certain final prospectuses of the Company constituting Part I
         of the Company's Registration Statement on Form S-3 (No. 333-02929)
         registering the 9 1/8% Senior Notes under the Securities Act of 1933,
         as amended.

                 "Investment Grade Ratings" has the meaning set forth in 
         Section 10.19.

                 "Measurement Date" has the meaning specified in this Section
         1.01 under the definition of "Consolidated Asset Coverage Ratio."

                 "Neddrill Agreement" means the Agreement of Sale and Purchase
         dated as of April 25, 1996, between the Company and Royal Nedlloyd
         N.V. and Neddrill Holding B.V.

                 "Neddrill Assets" means the Assets (as defined in the Neddrill
         Agreement) being acquired by the Company and the Subsidiaries pursuant
         to the Neddrill Agreement.

                 "Neddrill Joint Ventures" means (i) the drillship joint
         venture described in the Neddrill Agreement relating to the Neddrill
         Muravlenko and (ii) a joint venture relating to the drillship Valentin
         Shashin pursuant to which Neddrill or an Affiliate of Neddrill may in
         the future acquire an indirect ownership interest in such drillship.

                 "9 1/8% Senior Notes" means the 9 1/8% Senior Notes due 2006
         of the Company issued pursuant to the 1996 Indenture.

                 "1996 Indenture" means that certain Indenture dated as of July
         1, 1996 between the Company and Texas Commerce Bank National
         Association, as trustee, pursuant to which the 9 1/8% Senior Notes
         were issued.

                 "Rating Agencies" has the meaning given such term in Section 
         10.19.

                 "Suspended Covenants" has the meaning set forth in Section 
         10.19.

         (b) by amending each of the following definitions in full to read as
follows:

                 "Consolidated Interest Coverage Ratio" means as of the date of
         the transaction giving rise to the need to calculate the Consolidated
         Interest Coverage Ratio (the "Transaction Date"), the ratio of (i) the
         sum of (a) the aggregate amount of EBITDA of the Company and its
         consolidated Subsidiaries for the four fiscal quarters for which
         financial information in respect thereof is available immediately
         prior to the applicable Transaction Date (the "Determination Period")
         and (b) with respect to any fiscal quarter ending prior to July 1,
         1996 included in the calculation set forth in clause (a) above, the
         EBITDA for any such quarter attributable to the Neddrill Assets to
         (ii) the aggregate Consolidated Interest Expense of the Company and
         its consolidated Subsidiaries that is anticipated to accrue during a
         period consisting of the fiscal quarter in which the Transaction Date
         occurs and the three fiscal quarters immediately subsequent thereto
         (based upon





                                       2
<PAGE>   26
         the pro forma amount and maturity of, and interest payments in respect
         of, Indebtedness of the Company and its consolidated Subsidiaries
         reasonably expected by the Company to be outstanding on the
         Transaction Date and reasonably expected by the Company to be
         outstanding from time to time during such period), assuming for the
         purposes of this measurement the continuation of market interest rates
         prevailing on the Transaction Date and base interest rates in respect
         of floating interest rate obligations equal to the base interest rates
         on such obligations in effect as of the Transaction Date; provided
         that if the Company or any of its consolidated Subsidiaries is a party
         to any Interest-Swap Obligation which would have the effect of
         changing the interest rate on any Indebtedness of the Company or any
         of its consolidated Subsidiaries for such four quarter period (or a
         portion thereof), the resulting rate shall be used for such four
         quarter period or portion thereof; provided, further, that any
         Consolidated Interest Expense with respect to Indebtedness incurred or
         retired by the Company or any of its Subsidiaries during the fiscal
         quarter in which the Transaction Date occurs shall be calculated as if
         such debt was so incurred or retired on the first day of the fiscal
         quarter in which the Transaction Date occurs; provided, further, that
         if the transaction giving rise to the need to calculate the
         Consolidated Interest Coverage Ratio would have the effect of
         increasing or decreasing EBITDA in the future and if such increase or
         decrease is readily quantifiable and is directly attributable to such
         transaction, EBITDA shall be calculated on a pro forma basis as if
         such transaction had occurred on the first day of the four fiscal
         quarters referred to in clause (i) of this definition, and if, during
         the same four fiscal quarters, (x) the Company or any of its
         consolidated Subsidiaries shall have engaged in any Asset Sale, EBITDA
         for such period shall be reduced by an amount equal to the EBITDA (if
         positive), or increased by an amount equal to the EBITDA (if
         negative), directly attributable to the assets which are the subject
         of such Asset Sale for such period calculated on a pro forma basis as
         if such Asset Sale and any related retirement of Indebtedness had
         occurred on the first day of such period or (y) after July 1, 1996,
         the Company or any of its consolidated Subsidiaries shall have
         acquired any material assets out of the ordinary course of business,
         EBITDA and Consolidated Interest Expense (if Indebtedness is incurred
         or assumed in connection with such acquisition) shall be calculated on
         a pro forma basis as if such asset acquisition and related financing
         had occurred on the first day of such period.

                 "Consolidated Interest Expense" means, with respect to any
         Person for any period, without duplication (A) the sum of (i) the
         aggregate amount of cash and non-cash interest expense (including
         capitalized interest) of such Person and its subsidiaries for such
         period as determined on a consolidated basis in accordance with GAAP
         in respect of Indebtedness (including, without limitation, (v) any
         amortization of debt discount, (w) net costs associated with
         Interest-Swap Obligations (including any amortization of discounts),
         (x) the interest portion of any deferred payment obligation, (y) all
         accrued interest and (z) all commissions, discounts and other fees and
         charges owed with respect to letters of credit, bankers' acceptances
         or similar facilities) paid or accrued, or scheduled to be paid or
         accrued, during such period, (ii) dividends on preferred stock (other
         than dividends on the Preferred Stock) of such Person (and of its
         subsidiaries if paid to a Person other than such Person or its
         subsidiaries) declared and payable in cash, (iii) the portion of any
         rental obligation of such Person or its subsidiaries in respect of any
         Capital Lease Obligation allocable to interest expense in accordance
         with GAAP, (iv) the portion of any rental obligation of such Person or
         its subsidiaries in respect of any Sale and Lease-Back Transaction
         allocable to interest expense (determined as if such were treated as a
         Capital Lease Obligation), (v) to the extent any debt of any other
         Person is Guaranteed by such Person or any of its subsidiaries, the
         aggregate amount of interest paid, accrued or scheduled to be paid or
         accrued, by such other Person during such period attributable to any
         such debt and (vi) with respect to any fiscal quarter ending prior to
         April 1, 1996, an amount equal to quarterly interest expense accrued
         in respect of the 9 1/8% Senior Notes had such 9 1/8% Senior Notes
         been outstanding in the amount issued on July 1, 1996 during the
         entirety of such fiscal quarter, less (B) to the extent included in
         (A) above, amortization or write-off of deferred financing costs of
         such Person and its subsidiaries during such period and any charge
         related to any premium or penalty paid in connection with redeeming or
         retiring any Indebtedness of such Person and its subsidiaries prior to
         its stated maturity; in the case of both (A) and (B) above, after
         elimination of intercompany accounts among such Person and its
         subsidiaries and as determined in accordance with GAAP.

                 "Consolidated Net Income" of any Person means, for any period,
         the aggregate net income (or net loss, as the case may be) of such
         Person and its subsidiaries for such period on a consolidated basis,





                                       3
<PAGE>   27
         determined in accordance with GAAP; provided that there shall be
         excluded therefrom, without duplication, (i) gains and losses from
         Asset Sales or reserves relating thereto, (ii) items classified as
         extraordinary (other than the tax benefit of the utilization of net
         operating loss carryforwards and alternative minimum tax credits),
         (iii) except to the extent of the amount of cash dividends or other
         cash distributions in respect of Capital Stock actually paid to such
         specified Person or a subsidiary thereof by any other Person during
         such period, the net income (or loss) of such other Person other than
         a subsidiary of such specified Person, (iv) the net income of any
         Person acquired by such specified Person or any of its subsidiaries in
         a pooling-of-interests transaction for any period prior to the date
         of such acquisition, (v) any gain or loss, net of taxes, realized on
         the termination of any employee pension benefit plan, (vi) the effect
         of the adoption of Statement of Financial Accounting Standards No. 106
         to the extent expenses recognized pursuant to such adoption exceed the
         amount with respect to such expenses which would have been recognized
         during such period using the "pay as you go" accounting method, (vii)
         any charge against income for impairment or write-down of long-lived
         assets of the Company or any Subsidiary made in accordance with
         Statement of Financial Accounting Standards No. 121 and (viii) the net
         income of any subsidiary of such specified Person to the extent that
         the transfer to that Person of that income is not at the time
         permitted, directly or indirectly, by any means (including by
         dividend, distribution, advance or loan or otherwise), by operation of
         the terms of its charter or any agreement with a Person other than
         with such specified Person or any Affiliate thereof, instrument held
         by a Person other than by such specified Person or any Affiliate
         thereof, judgment, decree, order, statute, law, rule or governmental
         regulations applicable to such subsidiary or its stockholders, except
         for any dividends or distributions actually paid by such subsidiary to
         such Person.

                 "Corporate Trust Office" means the principal office of the
         Trustee at which at any particular time its corporate trust business
         shall be principally administered, which office is, on July 1, 1996,
         located at 600 Travis, 8th Floor, Houston, Texas 77002.  For purposes
         of Section 10.02 hereof, the Corporate Trust Office shall include the
         office of the Trustee's agent located on July 1, 1996 at 55 Water
         Street, North Bldg., Room 234, Windows 20 & 21, New York, New York
         10041.

                 "Material Subsidiary" means a Subsidiary that (i) has assets
         with an aggregate book value in an amount greater than 5% of the
         Consolidated Net Tangible Assets of the Company as of any date of
         determination as shown on a separate balance sheet of such Subsidiary
         or (ii) had operating revenues in excess of 5% of the operating
         revenues of the Company and the Subsidiaries as determined on a
         consolidated basis in accordance with GAAP for the four calendar
         quarters immediately preceding the calendar quarter that includes the
         determination date.

                 "Permitted Indebtedness" means:

                          (i)     Indebtedness of the Company under the 9 1/8% 
                 Senior Notes;

                          (ii)    Indebtedness of the Company and the
                 Subsidiaries under one or more bank credit facilities;
                 provided that at the date such Indebtedness is incurred and
                 after giving effect to the incurrence of such Indebtedness and
                 any substantially concurrent repayment of Indebtedness
                 permitted under this clause (ii) or under any bank credit
                 facility permitted pursuant to clause (v) hereof, the
                 aggregate amount of all Indebtedness outstanding at such time
                 under this clause (ii) and under any bank credit facility
                 permitted pursuant to clause (v) hereof shall not exceed
                 $100,000,000 (except as such amount may be permanently reduced
                 by the application of Net Available Proceeds in accordance
                 with clause (ii) of Section 10.13(b)) of the 1996 Indenture;

                          (iii)   Indebtedness of the Company or any Subsidiary
                 under Interest-Swap obligations; provided that (a) such
                 Interest-Swap Obligations are related to payment obligations
                 on Indebtedness otherwise permitted by Section 10.09 and (b)
                 the notional principal amount of such Interest-Swap
                 Obligations does not exceed the principal amount of the
                 Indebtedness to which such Interest-Swap Obligations relate;





                                       4
<PAGE>   28
                          (iv)    Indebtedness of the Company or any Subsidiary
                 under Currency Hedge Obligations; provided that (a) such
                 Currency Hedge Obligations are related to payment obligations
                 on Indebtedness otherwise permitted by Section 10.09 or to the
                 foreign currency cash flows reasonably expected to be
                 generated by the Company and the Subsidiaries and (b) the
                 notional principal amount of such Currency Hedge Obligations
                 does not exceed the principal amount of the Indebtedness or
                 the amount of the foreign currency cash flows to which such
                 Currency Hedge Obligations relate;

                          (v)     Indebtedness of the Company or any Subsidiary
                 outstanding on July 1, 1996 (including without limitation the
                 Notes) and listed on Schedule 1.01A to the 1996 Indenture;

                          (vi)    Indebtedness of the Company or any Subsidiary
                 in respect of performance bonds, surety bonds, appeal bonds
                 and letters of credit issued for the account of the Company or
                 any Subsidiary, in each case incurred in the ordinary course
                 of business and not in connection with the borrowing of money;

                          (vii)   Indebtedness of the Company to any Wholly
                 Owned Subsidiary (but only so long as it remains a Wholly
                 Owned Subsidiary);

                          (viii)  Indebtedness of any Subsidiary to the Company
                 or any Wholly Owned Subsidiary (but only so long as it remains
                 a Wholly Owned Subsidiary);

                          (ix)    Non-Recourse Indebtedness of any Non-Recourse
                 Subsidiary;

                          (x)     Indebtedness of the Company in connection
                 with a purchase of the Notes pursuant to a Change of Control
                 Offer; provided that the aggregate principal amount of such
                 Indebtedness does not exceed 101% of the aggregate principal
                 amount of the Notes purchased pursuant to such Change of
                 Control Offer plus the amount of expenses incurred in
                 connection therewith; provided, further, that such
                 Indebtedness (a) has an Average Life equal to or greater than
                 the remaining Average Life of the Notes and (b) does not
                 mature prior to one year following the Stated Maturity of the
                 Notes;

                          (xi)    other Indebtedness of the Company or any
                 Subsidiary; provided that at the date such Indebtedness is
                 incurred and after giving effect to the incurrence of such
                 Indebtedness, the aggregate amount of all Indebtedness
                 outstanding at such time under this clause (xi) shall not
                 exceed $30,000,000;

                          (xii)   Permitted Refinancing Indebtedness;

                          (xiii)  Indebtedness of any Subsidiary, if any, in
                 respect of the Safe Harbor Leases, the Letter of Credit
                 Agreement and the Mortgage, as such terms are defined in, and
                 as contemplated by, the Assets Purchase Agreement dated August
                 20, 1993, between the Company and Portal Rig Corporation; and

                          (xiv)   Project Finance Indebtedness, provided that
                 at the date such Indebtedness is incurred and after giving
                 effect to the incurrence of such Indebtedness, the aggregate
                 principal amount of all Indebtedness incurred and outstanding
                 at such time under this clause (xiv) (or under clause (i) of
                 Section 10.10 by reason of this clause (xiv) being referenced
                 therein) shall not exceed $75,000,000.

                          So as to avoid duplication in determining the amount
                 of Permitted Indebtedness under any clause of this definition,
                 Guarantees of, or obligations in respect of letters of credit
                 supporting, Indebtedness otherwise included in the
                 determination of such amount shall not also be included.





                                       5
<PAGE>   29
                 "Permitted Investments" means:

                          (i)     certificates of deposit, bankers'
                 acceptances, time deposits, Eurocurrency deposits and similar
                 types of investments routinely offered by commercial banks
                 with final maturities of one year or less issued by commercial
                 banks having capital and surplus in excess of $100,000,000;

                          (ii)    commercial paper issued by any corporation,
                 if such commercial paper has credit ratings of at least A-1 by
                 S&P and at least P-1 by Moody's;

                          (iii)   U.S. Government Obligations with a maturity
                 of four years or less;

                          (iv)    repurchase obligations for instruments of 
                 the type described in clause (iii) hereof;

                          (v)     shares of money market mutual or similar
                 funds having assets in excess of $100,000,000;

                          (vi)    payroll advances in the ordinary course of 
                 business;

                          (vii)   other advances and loans to officers and
                 employees of the Company or any Subsidiary, so long as the
                 aggregate principal amount of such advances and loans does not
                 exceed $500,000 at any one time outstanding;

                          (viii)  Investments represented by that portion of
                 the proceeds from Asset Sales (a) that is not Cash Proceeds or
                 (b) that is deemed to be Cash Proceeds pursuant to the second
                 sentence of the definition of "Cash Proceeds" set forth in
                 this Section 1.01;

                          (ix)    Investments in the NN-1 Limited Partnership,
                 a Texas limited partnership, pursuant to the Agreement of
                 Limited Partnership of the NN-1 Limited Partnership in an
                 aggregate amount not to exceed the amount of U.S. Government
                 Guaranteed Ship Financing Sinking Fund Bonds outstanding on
                 the Issue Date; and

                          (x)     Investments in respect of the interest being
                 acquired by the Company or any Subsidiary in the Neddrill
                 Joint Ventures.

                 "Permitted Liens" means:

                          (i)     Prior to July 1, 1996, Liens in existence on
                 the Issue Date and set forth on Schedule 1.01B, and on and
                 after July 1, 1996, Liens in existence on July 1, 1996 and set
                 forth on Schedule 1.01B to the 1996 Indenture;

                          (ii)    Prior to July 1, 1996, Liens created for the
                 benefit of the Notes, and on and after July 1, 1996, Liens
                 created for the benefit of either the Notes or the 9 1/8%
                 Senior Notes;

                          (iii)   Liens covering (a) accounts receivable and
                 inventory of the Company and the Subsidiaries and (b) other
                 assets of the Company and the Subsidiaries with a Fair Value
                 (as determined in good faith by the Board of Directors) not to
                 exceed $100,000,000, in each case securing Indebtedness that
                 may be incurred under clause (ii) of the definition of
                 "Permitted Indebtedness" set forth in this Section 1.01,
                 provided that if, at the time Liens are proposed to be granted
                 or created in reliance on this clause (b), Liens have been
                 granted to secure Project Finance Indebtedness as permitted by
                 the proviso of clause (xii) of this definition and the
                 aggregate principal amount of such secured Project Finance
                 Indebtedness exceeds $75,000,000, then the Fair Value of
                 assets on which Liens may be granted or created under this
                 clause (b) shall be limited to the greater of (x) $100,000,000
                 less the amount by which the outstanding aggregate principal





                                       6
<PAGE>   30
                 of Project Finance Indebtedness exceeds $75,000,000, (y) an
                 amount that would permit the Company, after the grant or
                 creation of proposed Liens pursuant to this clause (b), to
                 incur at least $1.00 of additional secured Project Finance
                 Indebtedness under the proviso of clause (xii) of this
                 definition and (z) an amount such that the Consolidated Assets
                 Coverage Ratio would have been at least 2.50 to 1 at the time
                 of the incurrence of Liens in reliance on the proviso of
                 clause (xii) of this definition had the Liens proposed to be
                 granted or created under this clause (b) been granted or
                 created immediately prior to the Measurement Date of such
                 Consolidated Asset Coverage Ratio;

                          (iv)    Liens on Property of a Person existing at the
                 time such Person is merged or consolidated with or into the
                 Company or a Subsidiary (and not incurred as a result of, or
                 in anticipation of, such transaction); provided, that such
                 Lien relates solely to the Property subject thereto;

                          (v)     Liens on Property existing at the time of the
                 acquisition thereof (and not incurred as a result of, or in
                 anticipation of, such transaction); provided that such Lien
                 relates solely to the Property subject thereto;

                          (vi)    Liens incurred or pledges and deposits in
                 connection with worker's compensation, unemployment insurance
                 and other social security benefits, statutory obligations,
                 surety or appeal bonds, performance bonds or other obligations
                 of a like nature (and obligations with respect to any letters
                 of credit issued in favor of the Company or a Subsidiary and
                 in order to secure or obtain any of the foregoing), in each
                 case incurred in the ordinary course of business and not in
                 connection with the borrowing of money;

                          (vii)   Liens imposed by law or arising by operation
                 of law, including, without limitation, landlords', mechanics',
                 carriers', warehousemen's, materialmen's, suppliers' and
                 vendors' Liens and Liens for master's and crew's wages and
                 other similar maritime Liens, and incurred in the ordinary
                 course of business;

                          (viii)  zoning restrictions, easements, licenses,
                 covenants, reservations, restrictions on the use of real
                 property and defects, irregularities and deficiencies in title
                 to real property that do not, individually or in the
                 aggregate, materially affect the ability of the Company or any
                 Subsidiary to conduct its business as presently conducted;

                          (ix)    Liens for taxes or assessments or other
                 governmental charges or levies not yet due and payable, or the
                 validity of which is being contested by the Company or a
                 Subsidiary in good faith by appropriate proceedings upon stay
                 of execution or the enforcement thereof and for which adequate
                 reserves in accordance with GAAP or other appropriate
                 provision has been made;

                          (x)     Liens to secure the payment of all or a part
                 of the purchase price or construction cost of Property
                 acquired or constructed after the Issue Date; provided that
                 (a) the principal amount of Indebtedness secured by such Liens
                 shall not exceed the lesser of cost or Fair Market Value of
                 the Assets or Property so acquired or constructed; and (b)
                 such Liens shall not encumber any other assets or Property of
                 the Company or any Subsidiary and shall attach to such
                 Property within 120 days of the construction or acquisition of
                 such Property;

                          (xi)    Liens securing Capital Lease Obligations;
                 provided, that such Liens secure Capital Lease Obligations
                 which, when combined with (a) the outstanding secured
                 Indebtedness of the Company (other than Indebtedness secured
                 by Liens described in clauses (ii), (iii), (x) and (xix)
                 hereof), (b) all Indebtedness and the aggregate liquidation
                 value of all preferred stock of any Subsidiary (other than a
                 Non-Recourse Subsidiary) incurred and outstanding in
                 accordance with Section 10.10 (other than of the type
                 described in clauses (iii), (x), (xv) and (xix) hereof) and
                 (c)





                                       7
<PAGE>   31
                 the aggregate amount of all other Capital Lease Obligations of
                 the Company and the Subsidiaries, does not exceed 10% of the
                 Consolidated Net Tangible Assets of the Company;

                          (xii)   Liens securing Project Finance Indebtedness
                 incurred under clause (xiv) of the definition of "Permitted
                 Indebtedness" as set forth in this Section 1.01; provided,
                 that if, at the date such Project Finance Indebtedness is
                 incurred and after giving effect to the incurrence of such
                 Indebtedness, the Consolidated Asset Coverage Ratio shall
                 equal or exceed 2.50 to 1.0 and such additional Indebtedness
                 can be incurred under paragraph (a) of Section 10.09 then,
                 notwithstanding the $75,000,000 limitation set forth in clause
                 (xiv) of the definition of "Permitted Indebtedness" set forth
                 in this Section 1.01, the aggregate principal amount of
                 Project Finance Indebtedness that may be secured under this
                 clause (xii) shall not exceed (i) $250,000,000, if the
                 Consolidated Interest Coverage Ratio (after giving pro forma
                 effect to the incurrence of such Project Finance Indebtedness)
                 shall be equal to or greater than 3.00 to 1.0 but less than
                 4.00 to 1.0 or (ii) $400,000,000, if the Consolidated Interest
                 Coverage Ratio (after giving pro forma effect to the
                 incurrence of such Project Finance Indebtedness) shall be
                 equal to or greater than 4.00 to 1.0;

                          (xiii)  Liens securing Indebtedness of the Company or
                 any Subsidiary; provided, that such Liens secure Indebtedness
                 which, when combined with (a) the outstanding secured
                 Indebtedness of the Company (other than Indebtedness secured
                 by Liens described under clauses (ii), (iii), (x) and (xix)
                 hereof), (b) all Indebtedness and the aggregate liquidation
                 value of all preferred stock of any Subsidiary (other than a
                 Non-Recourse Subsidiary) incurred and outstanding in
                 accordance with Section 10.10 (other than of the type
                 described in clauses (iii), (x), (xv) and (xix) hereof) and
                 (c) the aggregate amount of all Capital Lease Obligations of
                 the Company and the Subsidiaries, does not exceed 10% of the
                 Consolidated Net Tangible Assets of the Company;

                          (xiv)   Liens to secure any extension, renewal,
                 refinancing or refunding (or successive extensions, renewals,
                 refinancings or refundings), in whole or in part, of any
                 Indebtedness secured by Liens referred to in the foregoing
                 clauses (i), (ii), (iv) and (v); provided that such Lien does
                 not extend to any other Property of the Company or any
                 Subsidiary and the principal amount of the Indebtedness
                 secured by such Lien is not increased;

                          (xv)    Liens granted by a Non-Recourse Subsidiary
                 securing Non-Recourse Indebtedness of such Non-Recourse
                 Subsidiary and Liens on the Capital Stock of a Non-Recourse
                 Subsidiary securing Non- Recourse Indebtedness of such
                 Non-Recourse Subsidiary;

                          (xvi)   any charter or lease that would not
                 constitute an Asset Sale pursuant to clause (E) of the
                 definition of "Asset Sale" set forth in this Section 1.01;

                          (xvii)  leases or subleases of real property to other
                 Persons;

                          (xviii) Liens under the Safe Harbor Leases, the
                 Letter of Credit Agreement and the Mortgage, as such terms are
                 defined in, and as contemplated by, the Assets Purchase
                 Agreement dated August 20, 1993, between the Company and
                 Portal Rig Corporation, with respect to the Property being
                 acquired pursuant to such Assets Purchase Agreement;

                          (xix)   Liens on (a) up to eight submersible drilling
                 rigs, owned by the Company or any Subsidiaries as of July 1,
                 1996 including any improvements on such rigs, provided, that
                 the Company may from time to time designate one or more of
                 such rigs as Property that is not, and will not be, subject to
                 this clause (xix) by delivery of written notice of such
                 designation to the Trustee under this Indenture, whereupon
                 such designated rig or rigs shall cease to be covered by this
                 clause (xix) and, if unencumbered by any Lien (other than
                 Permitted Liens described in clauses (vii), (viii) and (ix) of
                 this definition), the Appraised Value of such designated rig
                 or rigs as of any Measurement Date shall be included in any
                 determination of Consolidated Asset





                                       8
<PAGE>   32
                 Coverage Ratio under this Indenture or (b) the Property
                 described in clause (ii)(l) of the definition of "Asset Sale"
                 set forth in Section 1.01 of the 1996 Indenture; and

                           (xx)   Liens resulting from the deposit of funds or
                 evidences of Indebtedness in trust for the purpose of
                 defeasing Indebtedness of the Company or any of the
                 Subsidiaries.

                 "Permitted Refinancing Indebtedness" means Indebtedness of the
         Company or a Subsidiary, incurred in exchange for, or the proceeds of
         which are used to renew, extend, refinance, refund or repurchase,
         outstanding Indebtedness of the Company or any Subsidiary which
         outstanding Indebtedness was incurred in accordance with, or is
         otherwise permitted by, the terms of this Indenture, other than any
         such Indebtedness permitted pursuant to clause (xi) of the definition
         of "Permitted Indebtedness" set forth in this Section 1.01; provided
         that (i) if the Indebtedness being renewed, extended, refinanced,
         refunded or repurchased is pari passu with or subordinated in right of
         payment to the Notes, then such new Indebtedness is pari passu with or
         subordinated in right of payment to, as the case may be, the Notes at
         least to the same extent as the Indebtedness being renewed, extended,
         refinanced, refunded or repurchased, (ii) such new Indebtedness is
         scheduled to mature later than the Indebtedness being renewed,
         extended, refinanced, refunded or repurchased, (iii) such new
         Indebtedness has an Average Life at the time such Indebtedness is
         incurred that is greater than the Average Life of the Indebtedness
         being renewed, extended, refinanced, refunded or repurchased and (iv)
         such new Indebtedness is in an aggregate principal amount (or, if such
         Indebtedness provides for an amount less than the principal amount
         thereof to be due and payable upon a declaration of acceleration of
         the maturity thereof, the original issue price of such Indebtedness
         is) not in excess of the aggregate principal amount then outstanding
         of the Indebtedness being renewed, extended, refinanced, refunded or
         repurchased (or if the Indebtedness being renewed, extended,
         refinanced, refunded or repurchased provides for an amount less than
         the principal amount thereof to be due and payable upon a declaration
         of acceleration of the maturity thereof, the original issue price of
         such Indebtedness plus any accreted value attributable thereto since
         the original issuance of such Indebtedness) plus the amount of any
         premium required to be paid in connection therewith pursuant to the
         terms of such Indebtedness or the amount of any premium reasonably
         determined by the Company or the Subsidiary, as applicable, as
         necessary to accomplish the foregoing by means of a tender or exchange
         offer or privately negotiated purchase, plus the amount of fees and
         expenses in connection therewith; provided, further that Permitted
         Refinancing Indebtedness shall not include (a) Indebtedness of a
         Subsidiary that is incurred to renew, extend, refinance, refund or
         repurchase Indebtedness of the Company and (b) Indebtedness (other
         than Non-Recourse Indebtedness of the related Non-Recourse Subsidiary)
         that is incurred to renew, extend, refinance, refund or repurchase
         Non-Recourse Indebtedness of such Non-Recourse Subsidiary.

                 "Preferred Stock" means the $1.50 Convertible Preferred Stock
         of the Company outstanding as of July 1, 1996.

                 "Project Finance Indebtedness" of a Person means any
         Indebtedness the proceeds of which will be used solely to make capital
         expenditures to repair, refurbish, upgrade or improve one or more
         drilling rigs owned or acquired (or to be owned or acquired) by such
         Person or an Affiliate thereof.

         Section 1.2.  Amendment of SECTION 10.07.  SECTION 10.07 of the
Indenture is amended by (a) deleting the comma after the reference to "clause
(i) above" in subsection (ii)(a) and substituting therefor the word "and", (b)
deleting the words "but less than $20,000,000" in subsection (ii)(b), and (c)
deleting the clause "and (c) with respect to a transaction or series of related
transactions that has a Fair Market Value equal to, or in excess of,
$20,000,000, the Company shall deliver to the Trustee an opinion of a
nationally recognized investment banking firm to the effect that such
transaction or series of related transactions complies with clause (i) above".

         Section 1.3.  Amendment of SECTION 10.08.  SECTION 10.08 of the
Indenture is amended by (a) deleting "the first day of the fiscal quarter of
the Company in which the Issue Date falls" in clause (iii)(A) of subsection (a)
and substituting therefor "October 1, 1993"; (b) in clause (iii)(B) of
subsection (a), (i) deleting the words "the amount of" and substituting
therefor "an amount equal to (x)", (ii) deleting the words "the Issue Date" and
substituting therefor "October 7, 1993", (iii) deleting the words "Company),
and" and substituting therefor





                                       9
<PAGE>   33
"Company and including the Equity Offerings), and (y)", (iv) adding the words
"or the Preferred Stock" after the words "carrying value of any Redeemable
Stock" and (v) deleting the words "the Issue Date, and (C)" and substitute
therefor "October 7, 1993, (C) in the case of the disposition or repayment of
any Investment constituting a Restricted Payment made after July 1, 1996 in
compliance with this Section 10.08 and the other provisions of this Indenture,
an amount equal to the lesser of the return of capital with respect to such
Investment and the initial amount of such Investment, in either case, minus the
cost of the disposition of such Investment and (D)"; and (c) adding the word
"not" between the words "subsection shall" and "be included" in the second
sentence of subsection (c).

         Section 1.4.  Amendment of SECTION 10.10.  SECTION 10.10 of the
Indenture is amended by (a) deleting the words "and (xiii)" in subsection (i)
and substituting therefor ", (xiii) and (xiv)" and (b) deleting the references
to "and (x)" in subsection (vi) and substituting therefor ", (x), (xv) and
(xix)".

         Section 1.5.  Amendment of ARTICLE X.  ARTICLE X of the Indenture is
amended by adding a new SECTION 10.19 to read as follows:

                 SECTION 10.19.  Certain Covenants Suspended.  The covenants
set forth in this Article X will be applicable to the Company, except that
during any period of time that:

                 (i)      the ratings assigned to the Notes by both S&P and
         Moody's (collectively, the "Rating Agencies") are equal to or higher
         than BBB- and Baa3, or the equivalents thereof, respectively (the
         "Investment Grade Ratings"); and

                 (ii)     no Event of Default or Default has occurred and is
         continuing,

the Company and its Subsidiaries will not be subject to the provisions of
Section 10.08 and Section 10.09 and clauses (3) and (4) of Section 8.01 of this
Indenture (collectively, the "Suspended Covenants").

                 In the event that the Company is not subject to the Suspended
Covenants for any period of time as a result of the preceding sentence and,
subsequently, one or both Rating Agencies withdraws its ratings or downgrades
the ratings assigned to the Notes below the required Investment Grade Ratings,
then the Company and its Subsidiaries will again be subject to the Suspended
Covenants and compliance with the Suspended Covenants with respect to
Restricted Payments made after the time of such withdrawal or downgrade will be
calculated in accordance with the terms of Section 10.08 as if such Section had
been in effect during the entire period of time from the date of this
Indenture.

         Section 1.6.  Amendment of SECTION 5.01.  SECTION 5.01 of the
Indenture is amended by (a) deleting the phrase "$5,000,000 for any single
Indebtedness or in an aggregate amount in excess of $10,000,000 for all
Indebtedness" in subsection (5) and substituting therefor the phrase
"$10,000,000 for any Indebtedness individually or in the aggregate", (b)
deleting "$5,000,000" in subsection (6) and substituting therefor "10,000,000",
(c) in subsection (7), adding the word "Material" immediately preceding each
reference to the word "Subsidiary" and capitalizing the word "property" and (d)
in subsection (8)(b), adding the word "Material" immediately preceding each
reference to the word "Subsidiary" not already so modified and capitalizing the
word "property".

         Section 2.  Payment upon Effectiveness.  Upon effectiveness of this
Supplemental Indenture, the Company shall pay to the Trustee for the account of
each Holder (other than the Company or any Affiliate of the Company) as of the
Record Date (as defined in the Company's Consent Solicitation Statement dated
September 6, 1996) of Notes in respect of which there has been delivered a
valid and unrevoked Consent (as defined in said Consent Solicitation Statement)
prior to the Expiration Date (as defined in said Consent Solicitation
Statement) ("Eligible Payment Recipient"), a fee equal to $3.75 in cash for
each $1,000 in principal amount of such Notes (a "Consent Payment").  Upon
receipt of a Company Order and such requisite funds from the Company, the
Trustee shall pay the aggregate Consent Payments to the Eligible Payment
Recipients in accordance with their respective interests.





                                       10
<PAGE>   34
         Section 3.  Governing Law.  THIS SUPPLEMENTAL INDENTURE SHALL BE
GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK
BUT WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE
EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE
REQUIRED THEREBY.

         Section 4.  Counterparts.  This Supplemental Indenture may be signed
in any number of counterparts, each of which shall be an original, with the
same effect as if the signature thereto and hereto were upon the same
instrument.

         Section 5.  Severability Clause.  In case any provision in this
Supplemental Indenture shall be invalid, illegal or unenforceable, to the
extent permitted by law, the validity, legality and enforceability of the
remaining provisions shall not in any way be affected or impaired thereby.

         Section 6.  Ratification.  Except as expressly amended by this
Supplemental Indenture, each provision of the Indenture shall remain in full
force and effect, and, as amended hereby, the Indenture is in all respects
agreed to, ratified and confirmed by each of the Company and the Trustee.

                                    *  *  *

         IN WITNESS WHEREOF, the Company and the Trustee have caused this
Indenture Supplement to be duly executed by their respective officers thereunto
duly authorized and their respective seals duly attested to be hereunto affixed
all as of the day and year first above written.

                                        "COMPANY"

                                        NOBLE DRILLING CORPORATION
[SEAL]                                  
                                                                               
Attest:                                 By:                                    
                                           ------------------------------------
                                        Name:                                  
                                        Title:                                 
                                                                               
- -------------------------------                                                
Name:                                                                          
Title:                                                                         
                                                                               
                                        "TRUSTEE"                              
                                                                               
                                        TEXAS COMMERCE BANK NATIONAL           
                                        ASSOCIATION, as Trustee                
[SEAL]                                                                         
                                                                               
Attest:                                 By:                                    
                                           ------------------------------------
                                        Name:                                  
                                        Title:                                 
                                                                               
- -------------------------------                                                
Name:                                      
Title:                                     





                                       11
<PAGE>   35
STATE OF TEXAS                    )
                                  )
COUNTY OF HARRIS                  )

         BEFORE ME, the undersigned authority, a Notary Public in and for said 
state, on this day personally appeared _______________ and _______________,
known to me to be the persons and officers whose names are subscribed to the
foregoing instrument and acknowledged to me that the same was the act of the
said NOBLE DRILLING CORPORATION, a Delaware corporation, and that they executed
the same as the act of said corporation for the purposes and consideration
therein expressed, and in the capacity therein stated.

         GIVEN UNDER MY HAND AND SEAL OF OFFICE, this ____ day of September, 
1996.


                                        ---------------------------------------
                                        Notary Public in and for the State of  
                                        Texas                                  
                                                                               
My commission expires:                                                         
                                        ---------------------------------------
                                        Printed Name of Notary Public          
                                        
- ----------------------------------


STATE OF TEXAS                    )
                                  )
COUNTY OF HARRIS                  )

         BEFORE ME, the undersigned authority, a Notary Public in and for said 
state, on this day personally appeared _______________ and _______________,
known to me to be the persons and officers whose names are subscribed to the
foregoing instrument and acknowledged to me that the same was the act of the
said TEXAS COMMERCE BANK NATIONAL ASSOCIATION, as trustee, a national banking
association, and that they executed the same as the act of said national banking
association for the purposes and consideration therein expressed, and in the
capacity therein stated.

         GIVEN UNDER MY HAND AND SEAL OF OFFICE, this ____ day of September, 
1996.



                                        ---------------------------------------
                                        Notary Public in and for the State of  
                                        Texas                                  
                                                                               
My commission expires:                                                         
                                        ---------------------------------------
                                        Printed Name of Notary Public          

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


                                       12
<PAGE>   36
                                                                  ANNEX II

               TEXT OF PROPOSED AMENDMENTS MARKED TO SHOW CHANGES

   [The text of the new defined terms added by the Proposed Amendments and
      of the new Section 10.19 added by the Proposed Amendments is set
          forth in Section 1.1(a) and Section 1.5, respectively, of
           the First Supplemental Indenture attached as Annex I.]


  SECTION 1.01.    Definitions.

 ...

   
          "Consolidated Interest Coverage Ratio" means as of the date of the
transaction giving rise to the need to calculate the Consolidated Interest
Coverage Ratio (the "Transaction Date"), the ratio of (i) the sum of (a) the
aggregate amount of EBITDA of the Company and its consolidated Subsidiaries for
the four fiscal quarters for which financial information in respect thereof is
available immediately prior to the applicable Transaction Date (the
"Determination Period") and (b) with respect to any fiscal quarter ending prior
to July 1, 1996 included in the calculation set forth in clause (a) above, the
EBITDA for any such quarter or period attributable to the Neddrill Assets to
(ii) the aggregate Consolidated Interest Expense of the Company and its
consolidated Subsidiaries that is anticipated to accrue during a period
consisting of the fiscal quarter in which the Transaction Date occurs and the
three fiscal quarters immediately subsequent thereto (based upon the pro forma
amount and maturity of, and interest payments in respect of, Indebtedness of
the Company and its consolidated Subsidiaries reasonably expected by the
Company to be outstanding on the Transaction Date and reasonably expected by
the Company to be outstanding from time to time during such period), assuming
for the purposes of this measurement the continuation of market interest rates
prevailing on the Transaction Date and base interest rates in respect of
floating interest rate obligations equal to the base interest rates on such
obligations in effect as of the Transaction Date; provided that if the Company
or any of its consolidated Subsidiaries is a party to any Interest-Swap
Obligation which would have the effect of changing the interest rate on any
Indebtedness of the Company or any of its consolidated Subsidiaries for such
four quarter period (or a portion thereof), the resulting rate shall be used
for such four quarter period or portion thereof; provided, further, that any
Consolidated Interest Expense with respect to Indebtedness incurred or retired
by the Company or any of its Subsidiaries during the fiscal quarter in which
the Transaction Date occurs shall be calculated as if such debt was so incurred
or retired on the first day of the fiscal quarter in which the Transaction Date
occurs; provided, further, that if the transaction giving rise to the need to
calculate the Consolidated Interest Coverage Ratio would have the effect of
increasing or decreasing EBITDA in the future and if such increase or decrease
is readily quantifiable and is directly attributable to such transaction,
EBITDA shall be calculated on a pro forma basis as if such transaction had
occurred on the first day of the four fiscal quarters referred to in clause (i)
of this definition, and if, during the same four fiscal quarters, (x) the
Company or any of its consolidated Subsidiaries shall have engaged in any Asset
Sale, EBITDA for such period shall be reduced by an amount equal to the EBITDA
(if positive), or increased by an amount equal to the EBITDA (if negative),
directly attributable to the assets which are the subject of such Asset Sale
for such period calculated on a pro forma basis as if such Asset Sale and any
related retirement of Indebtedness had occurred on the first day of such period
or (y) after the Issue Date, the Company or any of its consolidated
Subsidiaries shall have acquired any material assets out of the ordinary course
of business, EBITDA and Consolidated Interest Expense (if Indebtedness is
incurred or assumed in connection with such acquisition) shall be calculated on
a pro forma basis as if such asset acquisition and related financing had
occurred on the first day of such period.
    

          "Consolidated Interest Expense" means, with respect to any Person for
any period, without duplication (A) the sum of (i) the aggregate amount of cash
and non-cash interest expense (including capitalized interest) of such Person
and its subsidiaries for such period as determined on a consolidated basis in
accordance with GAAP in respect of Indebtedness (including, without limitation,
(v) any amortization of debt discount, (w) net costs associated with
Interest-Swap Obligations (including any amortization of discounts), (x) the
interest portion of any deferred payment obligation, (y) all accrued interest
and (z) all commissions, discounts and other fees and charges






                                     II-1
<PAGE>   37
   
owed with respect to letters of credit, bankers' acceptances or similar
facilities) paid or accrued, or scheduled to be paid or accrued, during such
period, (ii) dividends on preferred stock (other than dividends on the
Preferred Stock) of such Person (and of its subsidiaries if paid to a Person
other than such Person or its subsidiaries) declared and payable in cash, (iii)
the portion of any rental obligation of such Person or its subsidiaries in
respect of any Capital Lease Obligation allocable to interest expense in
accordance with GAAP, (iv) the portion of any rental obligation of such Person
or its subsidiaries in respect of any Sale and Lease-Back Transaction allocable
to interest expense (determined as if such were treated as a Capital Lease
Obligation), (v) to the extent any debt of any other Person is Guaranteed by
such Person or any of its subsidiaries, the aggregate amount of interest paid,
accrued or scheduled to be paid or accrued, by such other Person during such
period attributable to any such debt and (vi) with respect to any fiscal
quarter ending prior to April 1, 1996, an amount equal to quarterly interest
expense accrued in respect of the 9 1/8% Senior Notes had such 9 1/8% Senior
Notes been outstanding in the amount issued on July 1, 1996 during the entirety
of such fiscal quarter, less (B) to the extent included in (A) above,
amortization or write-off of deferred financing costs of such Person and its
subsidiaries during such period and any charge related to any premium or
penalty paid in connection with redeeming or retiring any Indebtedness of such
Person and its subsidiaries prior to its stated maturity; in the case of both
(A) and (B) above, after elimination of intercompany accounts among such Person
and its subsidiaries and as determined in accordance with GAAP.
    

   
          "Consolidated Net Income" of any Person means, for any period, the
aggregate net income (or net loss, as the case may be) of such Person and its
subsidiaries for such period on a consolidated basis, determined in accordance
with GAAP; provided that there shall be excluded therefrom, without
duplication, (i) gains and losses from Asset Sales or reserves relating
thereto, (ii) items classified as extraordinary (other than the tax benefit of
the utilization of net operating loss carryforwards and alternative minimum tax
credits), (iii) except to the extent of the amount of cash dividends or other
cash distributions in respect of Capital Stock actually paid to such specified
Person or a subsidiary thereof by any other Person during such period, the net
income (or loss) of such other Person other than a subsidiary of such specified
Person, (iv) the net income of any Person acquired by such specified Person or
any of its subsidiaries in a pooling-of-interests transaction for any period
prior to the date of such acquisition, (v) any gain or loss, net of taxes,
realized on the termination of any employee pension benefit plan, (vi) the
effect of the adoption of Statement of Financial Accounting Standards No. 106
to the extent expenses recognized pursuant to such adoption exceed the amount
with respect to such expenses which would have been recognized during such
period using the "pay as you go" accounting method, (vii) any charge against
income for impairment or write-down of long-lived assets of the Company or any
Subsidiary made in accordance with Statement of Financial Accounting Standards
No. 121 and (viii) the net income of any subsidiary of such specified Person to
the extent that the transfer to that Person of that income is not at the time
permitted, directly or indirectly, by any means (including by dividend,
distribution, advance or loan or otherwise), by operation of the terms of its
charter or any agreement with a Person other than with such specified Person or
any Affiliate thereof, instrument held by a Person other than by such specified
Person or any Affiliate thereof, judgment, decree, order, statute, law, rule or
governmental regulations applicable to such subsidiary or its stockholders,
except for any dividends or distributions actually paid by such subsidiary to
such Person.
    


   
          "Corporate Trust Office" means the principal office of the Trustee at
which at any particular time its corporate trust business shall be principally
administered, which office is, on July 1, 1996, located at 600 Travis, 8th
Floor, Houston, Texas 77002.  For purposes of Section 10.02 hereof, the
Corporate Trust Office shall include the office of the Trustee's agent located
on July 1, 1996 at 55 Water Street, North Bldg., Room 234, Windows 20 & 21,
New York, New York 10041.
    

   
          "Material Subsidiary" means a Subsidiary that (i) has assets with an
aggregate book value in an amount greater than 5% of the Consolidated Net
Tangible Assets of the Company as of any date of determination as shown on a
separate balance sheet of such Subsidiary or (ii) had operating revenues in
excess of 5% of the operating revenues of the Company and the Subsidiaries as
determined on a consolidated basis in accordance with GAAP for the four
calendar quarters immediately preceding the calendar quarter that includes the
determination date.
    





                                      II-2
<PAGE>   38
          "Permitted Indebtedness" means:

   
          (i)      Indebtedness of the Company under the 9 1/8% Senior Notes;
    

   
          (ii)     Indebtedness of the Company and the Subsidiaries under one or
     more bank credit facilities; provided that at the date such Indebtedness
     is incurred and after giving effect to the incurrence of such Indebtedness
     and any substantially concurrent repayment of Indebtedness permitted under
     this clause (ii) or under any bank credit facility permitted pursuant to
     clause (v) hereof, the aggregate amount of all Indebtedness outstanding at
     such time under this clause (ii) and under any bank credit facility
     permitted pursuant to clause (v) hereof shall not exceed $100,000,000
     (except as such amount may be permanently reduced by the application of
     Net Available Proceeds in accordance with clause (ii) of Section 10.13(b)
     of the 1996 Indenture);
    

          (iii)    Indebtedness of the Company or any Subsidiary under
     Interest-Swap obligations; provided that (a) such Interest-Swap
     Obligations are related to payment obligations on Indebtedness otherwise
     permitted by Section 10.09 and (b) the notional principal amount of such
     Interest-Swap Obligations does not exceed the principal amount of the
     Indebtedness to which such Interest-Swap Obligations relate;

          (iv)     Indebtedness of the Company or any Subsidiary under Currency
     Hedge Obligations; provided that (a) such Currency Hedge Obligations are
     related to payment obligations on Indebtedness otherwise permitted by
     Section 10.09 or to the foreign currency cash flows reasonably expected to
     be generated by the Company and the Subsidiaries and (b) the notional
     principal amount of such Currency Hedge Obligations does not exceed the
     principal amount of the Indebtedness or the amount of the foreign currency
     cash flows to which such Currency Hedge Obligations relate;

   
          (v)      Indebtedness of the Company or any Subsidiary outstanding on
     July 1, 1996 (including without limitation the Notes) and listed on
     Schedule 1.01A to the 1996 Indenture;
    

          (vi)     Indebtedness of the Company or any Subsidiary in respect of
     performance bonds, surety bonds, appeal bonds and letters of credit issued
     for the account of the Company or any Subsidiary, in each case incurred in
     the ordinary course of business and not in connection with the borrowing
     of money;

   
          (vii)    Indebtedness of the Company to any Wholly Owned Subsidiary
     (but only so long as it remains a Wholly Owned Subsidiary);
    

          (viii)   Indebtedness of any Subsidiary to the Company or any
     Wholly Owned Subsidiary (but only so long as it remains a Wholly Owned
     Subsidiary);

          (ix)     Non-Recourse Indebtedness of any Non-Recourse Subsidiary;

   
          (x)      Indebtedness of the Company in connection with a purchase of
     the Notes pursuant to a Change of Control Offer; provided that the
     aggregate principal amount of such Indebtedness does not exceed 101% of
     the aggregate principal amount of the Notes purchased pursuant to such
     Change of Control Offer plus the amount of expenses incurred in connection
     therewith; provided, further, that such Indebtedness (a) has an Average
     Life equal to or greater than the remaining Average Life of the Notes and
     (b) does not mature prior to one year following the Stated Maturity of the
     Notes;
    

   
          (xi)     other Indebtedness of the Company or any Subsidiary; provided
     that at the date such Indebtedness is incurred and after giving effect to
     the incurrence of such Indebtedness, the aggregate amount of all
     Indebtedness outstanding at such time under this clause (xi) shall not
     exceed $30,000,000;
    





                                      II-3
<PAGE>   39
   
    

   
          (xii)    Permitted Refinancing Indebtedness;
    

          (xiii)   Indebtedness of any Subsidiary, if any, in respect of the
     Safe Harbor Leases, the Letter of Credit Agreement and the Mortgage, as
     such terms are defined in, and as contemplated by, the Assets Purchase
     Agreement dated August 20, 1993, between the Company and Portal Rig
     Corporation; and

   
          (xiv)    Project Finance Indebtedness, provided that at the date such
     Indebtedness is incurred and after giving effect to the incurrence of such
     Indebtedness, the aggregate principal amount of all Indebtedness incurred
     and outstanding at such time under this clause (xiv) (or under clause (i)
     of Section 10.10 by reason of this clause (xiv) being referenced therein)
     shall not exceed $75,000,000.
    

So as to avoid duplication in determining the amount of Permitted Indebtedness
under any clause of this definition, Guarantees of, or obligations in respect
of letters of credit supporting, Indebtedness otherwise included in the
determination of such amount shall not also be included.

          "Permitted Investments" means:

          (i)      certificates of deposit, bankers' acceptances, time deposits,
     Eurocurrency deposits and similar types of investments routinely offered
     by commercial banks with final maturities of one year or less issued by
     commercial banks having capital and surplus in excess of $100,000,000;

          (ii)     commercial paper issued by any corporation, if such 
     commercial paper has credit ratings of at least A-1 by S&P and at least 
     P-1 by Moody's;

          (iii)    U.S. Government Obligations with a maturity of four years or
     less;

          (iv)     repurchase obligations for instruments of the type described
     in clause (iii) hereof;

          (v)      shares of money market mutual or similar funds having assets
     in excess of $100,000,000;

          (vi)     payroll advances in the ordinary course of business;

          (vii)    other advances and loans to officers and employees of the
     Company or any Subsidiary, so long as the aggregate principal amount of
     such advances and loans does not exceed $500,000 at any one time
     outstanding;

   
          (viii)   Investments represented by that portion of the proceeds
     from Asset Sales (a) that is not Cash Proceeds or (b) that is deemed to be
     Cash Proceeds pursuant to the second sentence of the definition of "Cash
     Proceeds" set forth in this Section 1.01;
    

   
    




                                      II-4
<PAGE>   40
   
          (ix)     Investments in the NN-1 Limited Partnership, a Texas limited
     partnership, pursuant to the Agreement of Limited Partnership of the NN-1
     Limited Partnership in an aggregate amount not to exceed the amount of
     U.S. Government Guaranteed Ship Financing Sinking Fund Bonds outstanding
     on the Issue Date; and
    

   
          (x)      Investments in respect of the interest being acquired by the
     Company or any Subsidiary in the Neddrill Joint Ventures.
    

   
          "Permitted Liens" means:
    

   
          (i)      Prior to July 1, 1996, Liens in existence on the Issue Date
     and set forth on Schedule 1.01B, and on and after July 1, 1996, Liens in
     existence on July 1, 1996 and set forth on Schedule 1.01B to the 1996
     Indenture;
    

          (ii)     Prior to July 1, 1996, Liens created for the benefit of the
     Notes, and on and after July 1, 1996, Liens created for the benefit of
     either the Notes or the 9 1/8% Senior Notes;

   
          (iii)    Liens covering (a) accounts receivable and inventory of the
     Company and the Subsidiaries and (b) other assets of the Company and the
     Subsidiaries with a Fair Value (as determined in good faith by the Board
     of Directors) not to exceed $100,000,000, in each case securing
     Indebtedness that may be incurred under clause (ii) of the definition of
     "Permitted Indebtedness" set forth in this Section 1.01, provided that if,
     at the time Liens are proposed to be granted or created in reliance on
     this clause (b), Liens have been granted to secure Project Finance
     Indebtedness as permitted by the proviso of clause (xii) of this
     definition and the aggregate principal amount of such secured Project
     Finance Indebtedness exceeds $75,000,000, then the Fair Value of assets on
     which Liens may be granted or created under this clause (b) shall be
     limited to the greater of (x) $100,000,000 less the amount by which the
     outstanding aggregate principal of Project Finance Indebtedness exceeds
     $75,000,000, (y) an amount that would permit the Company, after the grant
     or creation of proposed Liens pursuant to this clause (b), to incur at
     least $1.00 of additional secured Project Finance Indebtedness under the
     proviso of clause (xii) of this definition and (z) an amount such that the
     Consolidated Assets Coverage Ratio would have been at least 2.50 to 1 at
     the time of the incurrence of Liens in reliance on the proviso of clause
     (xii) of this definition had the Liens proposed to be granted or created
     under this clause (b) been granted or created immediately prior to the
     Measurement Date of such Consolidated Asset Coverage Ratio;
    

          (iv)     Liens on Property of a Person existing at the time such 
     Person is merged or consolidated with or into the Company or a Subsidiary 
     (and not incurred as a result of, or in anticipation of, such transaction);
     provided, that such Lien relates solely to the Property subject thereto;

          (v)      Liens on Property existing at the time of the acquisition
     thereof (and not incurred as a result of, or in anticipation of, such
     transaction); provided that such Lien relates solely to the Property
     subject thereto;

   
          (vi)     Liens incurred or pledges and deposits in connection with
     worker's compensation, unemployment insurance and other social security
     benefits, statutory obligations, surety or appeal bonds, performance bonds
     or other obligations of a like nature (and obligations with respect to any
     letters of credit issued in favor of the Company or a Subsidiary and in
     order to secure or obtain any of the foregoing), in each case incurred in
     the ordinary course of business and not in connection with the borrowing
     of money;
    





                                      II-5
<PAGE>   41
          (vii)    Liens imposed by law or arising by operation of law,
     including, without limitation, landlords', mechanics', carriers',
     warehousemen's, materialmen's, suppliers' and vendors' Liens and Liens for
     master's and crew's wages and other similar maritime Liens, and incurred
     in the ordinary course of business;

          (viii)   zoning restrictions, easements, licenses, covenants,
     reservations, restrictions on the use of real property and defects,
     irregularities and deficiencies in title to real property that do not,
     individually or in the aggregate, materially affect the ability of the
     Company or any Subsidiary to conduct its business as presently conducted;

          (ix)     Liens for taxes or assessments or other governmental charges
     or levies not yet due and payable, or the validity of which is being
     contested by the Company or a Subsidiary in good faith by appropriate
     proceedings upon stay of execution or the enforcement thereof and for
     which adequate reserves in accordance with GAAP or other appropriate
     provision has been made;

   
          (x)      Liens to secure the payment of all or a part of the purchase
     price or construction cost of Property acquired or constructed after the
     Issue Date; provided that (a) the principal amount of Indebtedness secured
     by such Liens shall not exceed the lesser of cost or Fair Market Value of
     the Assets or Property so acquired or constructed; and (b) such Liens
     shall not encumber any other assets or Property of the Company or any
     Subsidiary and shall attach to such Property within 120 days of the
     construction or acquisition of such Property;
    

   
          (xi)     Liens securing Capital Lease Obligations; provided, that such
     Liens secure Capital Lease Obligations which, when combined with (a) the
     outstanding secured Indebtedness of the Company (other than Indebtedness
     secured by Liens described in clauses (ii), (iii), (x) and (xix) hereof),
     (b) all Indebtedness and the aggregate liquidation value of all preferred
     stock of any Subsidiary (other than a Non-Recourse Subsidiary) incurred
     and outstanding in accordance with Section 10.10 (other than of the type
     described in clauses (iii), (x), (xv) and (xix) hereof) and (c) the
     aggregate amount of all other Capital Lease Obligations of the Company and
     the Subsidiaries, does not exceed 10% of the Consolidated Net Tangible
     Assets of the Company;
    

   
          (xii)    Liens securing Project Finance Indebtedness incurred under
     clause (xiv) of the definition of "Permitted Indebtedness" as set forth in
     this Section 1.01; provided, that if, at the date such Project Finance
     Indebtedness is incurred and after giving effect to the incurrence of such
     Indebtedness, the Consolidated Asset Coverage Ratio shall equal or exceed 
     2.50 to 1.0 and such additional Indebtedness can be incurred under
     paragraph (a) of Section 10.09 then, notwithstanding the $75,000,000
     limitation set forth in clause (xiv) of the definition of "Permitted
     Indebtedness" set forth in this Section 1.01, the aggregate principal
     amount of Project Finance Indebtedness that may be secured under this
     clause (xii) shall not exceed (i) $250,000,000, if the Consolidated
     Interest Coverage Ratio (after giving pro forma effect to the incurrence
     of such Project Finance Indebtedness) 
    




                                      II-6
<PAGE>   42
     shall be equal to or greater than 3.00 to 1.0 but less than 4.00 to 1.0
     or (ii) $400,000,000, if the Consolidated Interest Coverage Ratio (after
     giving pro forma effect to the incurrence of such Project Finance
     Indebtedness) shall be equal to or greater than 4.00 to 1.0;

   
          (xiii)   Liens securing Indebtedness of the Company or any
     Subsidiary; provided, that such Liens secure Indebtedness which, when
     combined with (a) the outstanding secured Indebtedness of the Company
     (other than Indebtedness secured by Liens described under clauses (ii),
     (iii), (x) and (xix) hereof), (b) all Indebtedness and the aggregate
     liquidation value of all preferred stock of any Subsidiary (other than a
     Non-Recourse Subsidiary) incurred and outstanding in accordance with
     Section 10.10 (other than of the type described in clauses (iii), (x) ,
     (xv) and (xix) hereof) and (c) the aggregate amount of all Capital Lease
     Obligations of the Company and the Subsidiaries, does not exceed 10% of
     the Consolidated Net Tangible Assets of the Company;
    

          (xiv)    Liens to secure any extension, renewal, refinancing or
     refunding (or successive extensions, renewals, refinancings or
     refundings), in whole or in part, of any Indebtedness secured by Liens
     referred to in the foregoing clauses (i), (ii), (iv) and (v); provided
     that such Lien does not extend to any other Property of the Company or any
     Subsidiary and the principal amount of the Indebtedness secured by such
     Lien is not increased;

          (xv)     Liens granted by a Non-Recourse Subsidiary securing
     Non-Recourse Indebtedness of such Non-Recourse Subsidiary and Liens on the
     Capital Stock of a Non-Recourse Subsidiary securing Non-Recourse
     Indebtedness of such Non-Recourse Subsidiary;

   
          (xvi)    any charter or lease that would not constitute an Asset Sale
     pursuant to clause (E) of the definition of "Asset Sale" set forth in this
     Section 1.01;
    

   
          (xvii)   leases or subleases of real property to other Persons;
    

   
          (xviii)  Liens under the Safe Harbor Leases, the Letter of Credit
     Agreement and the Mortgage, as such terms are defined in, and as
     contemplated by, the Assets Purchase Agreement dated August 20, 1993,
     between the Company and Portal Rig Corporation, with respect to the
     Property being acquired pursuant to such Assets Purchase Agreement;
    

          (xix)    Liens on (a) up to eight submersible drilling rigs, owned by
     the Company or any Subsidiaries as of July 1, 1996 including any
     improvements on such rigs, provided, that the Company may from time to
     time designate one or more of such rigs as Property that is not, and will
     not be, subject to this clause (xix) by delivery of written notice of such
     designation to the Trustee under this Indenture, whereupon such designated
     rig or rigs shall cease to be covered by this clause (xix) and, if
     unencumbered by any Lien (other than Permitted Liens described in clauses
     (vii), (viii) and (ix) of this definition), the Appraised Value of such
     designated rig or rigs as of any Measurement Date shall be included in any
     determination of Consolidated Asset Coverage Ratio under this Indenture or
     (b) the Property described in clause (ii)(l) of the definition of "Asset
     Sale" set forth in Section 1.01 of the 1996 Indenture; and

   
          (xx)     Liens resulting from the deposit of funds or evidences of
     Indebtedness in trust for the purpose of defeasing Indebtedness of the
     Company or any of the Subsidiaries.
    

   
          "Permitted Refinancing Indebtedness" means Indebtedness of the
Company or a Subsidiary, incurred in exchange for, or the proceeds of which are
used to renew, extend, refinance, refund or repurchase, outstanding
Indebtedness of the Company or any Subsidiary which outstanding Indebtedness
was incurred in accordance with, or is otherwise permitted by, the terms of
this Indenture, other than any such Indebtedness permitted pursuant to clause
(xi) of the definition of "Permitted Indebtedness" set forth in this Section
1.01; provided that (i) if the Indebtedness being renewed, extended,
refinanced, refunded or repurchased is pari passu with or subordinated in right
of payment to the Notes, then such new Indebtedness is pari passu with or
    





                                      II-7
<PAGE>   43
   
subordinated in right of payment to, as the case may be, the Notes at least to
the same extent as the Indebtedness being renewed, extended, refinanced,
refunded or repurchased, (ii) such new Indebtedness is scheduled to mature
later than the Indebtedness being renewed, extended, refinanced, refunded or
repurchased, (iii) such new Indebtedness has an Average Life at the time such
Indebtedness is incurred that is greater than the Average Life of the
Indebtedness being renewed, extended, refinanced, refunded or repurchased and
(iv) such new Indebtedness is in an aggregate principal amount (or, if such
Indebtedness provides for an amount less than the principal amount thereof to
be due and payable upon a declaration of acceleration of the maturity thereof,
the original issue price of such Indebtedness is) not in excess of the
aggregate principal amount then outstanding of the Indebtedness being renewed,
extended, refinanced, refunded or repurchased (or if the Indebtedness being
renewed, extended, refinanced, refunded or repurchased provides for an amount
less than the principal amount thereof to be due and payable upon a declaration
of acceleration of the maturity thereof, the original issue price of such
Indebtedness plus any accreted value attributable thereto since the original
issuance of such Indebtedness) plus the amount of any premium required to be
paid in connection therewith pursuant to the terms of such Indebtedness or the
amount of any premium reasonably determined by the Company or the Subsidiary,
as applicable, as necessary to accomplish the foregoing by means of a tender or
exchange offer or privately negotiated purchase, plus the amount of fees and
expenses in connection therewith; provided, further that Permitted Refinancing
Indebtedness shall not include (a) Indebtedness of a Subsidiary that is
incurred to renew, extend, refinance, refund or repurchase Indebtedness of the
Company and (b) Indebtedness (other than Non-Recourse Indebtedness of the
related Non-Recourse Subsidiary) that is incurred to renew, extend, refinance,
refund or repurchase Non-Recourse Indebtedness of such Non-Recourse Subsidiary.
    

   
          "Preferred Stock" means the $1.50 Convertible Preferred Stock of
the Company outstanding as of July 1, 1996.
    

   
          "Project Finance Indebtedness" of a Person means any Indebtedness the
proceeds of which will be used solely to make capital expenditures to repair,
refurbish, upgrade or improve one or more drilling rigs owned or acquired (or
to be owned or acquired) by such Person or an Affiliate thereof.
    





                                      II-8
<PAGE>   44
   
          SECTION 10.07.   Transactions with Affiliates.  Subsequent to the
Issue Date, the Company shall not, and shall not permit any Subsidiary to,
directly or indirectly, enter into or permit to exist any transaction or series
of related transactions (including, but not limited to, the purchase, sale,
lease or exchange of Property, the making of any Investment, the giving of any
Guarantee or the rendering of any service) with any Affiliate of the Company
other than the Company or a Wholly Owned Subsidiary except a Non-Recourse
Subsidiary unless (i) such transaction or series of related transactions is on
terms no less favorable to the Company or such Subsidiary than those that could
be obtained in a comparable arm's length transaction with a Person that is not
such an Affiliate and (ii) (a) with respect to a transaction or series of
related transactions that has a Fair Market Value in excess of $2,000,000 but
less than $5,000,000, the Company delivers an Officers' Certificate to the
Trustee certifying that such transaction or series of related transactions
complies with clause (i) above and (b) with respect to a transaction or series
of related transactions that has a Fair Market Value equal to, or in excess of,
$5,000,000, the transaction or series of related transactions is approved by a
majority of the Board of Directors (including a majority of the disinterested
directors), which approval is set forth in a Board Resolution certifying that
such transaction or series of related transactions complies with clause (i)
above.
    





                                      II-9
<PAGE>   45
   
          SECTION 10.08.   Limitation on Restricted Payments.  (a) The Company
shall not, nor shall it permit any of its Subsidiaries (other than Non-Recourse
Subsidiaries) to, make any Restricted Payment if at the time thereof, and after
giving effect thereto (the amount of any such payment to be made other than in
cash to be determined by the Board of Directors, which determination shall be
conclusive and evidenced by a Board Resolution), (i) any Default shall have
occurred and be continuing or would result therefrom, (ii) the incurrence of at
least $1.00 of additional Indebtedness would not be permitted under Section
10.09(a) or (iii) the aggregate amount of all Restricted Payments declared or
made on or subsequent to the Issue Date by the Company or any Subsidiary (other
than a Non-Recourse Subsidiary) would exceed the sum of (A) 50% (or if
Consolidated Net Income of the Company shall be a deficit, minus 100% of such
deficit) of the aggregate Consolidated Net Income of the Company accrued during
the period beginning on October 1, 1993 and ending on the last day of the
fiscal quarter immediately preceding the date of such proposed Restricted
Payment, (B) an amount equal to (x) the aggregate net cash proceeds received by
the Company, subsequent to October 7, 1993, from the issuance or sale (other
than to a Subsidiary), subsequent to October 7, 1993, of shares of its Capital
Stock (excluding Redeemable Stock, but including Capital Stock of the Company
issued upon the exercise of options, warrants or rights to purchase Capital
Stock (other than Redeemable Stock) of the Company and including the Equity
Offerings), and (y) the liability (expressed as a positive number) in
accordance with GAAP of any Indebtedness of the Company, or the carrying value
of any Redeemable Stock or the Preferred Stock, which has been converted into,
exchanged for or satisfied by the issuance of shares of Capital Stock (other
than Redeemable Stock) of the Company, subsequent to October 7, 1993, (C) in
the case of the disposition or repayment of any Investment constituting a
Restricted Payment made after July 1, 1996 in compliance with this Section
10.08 and the other provisions of this Indenture, an amount equal to the lesser
of the return of capital with respect to such Investment and the initial amount
of such Investment, in either case, minus the cost of the disposition of such
Investment and (D) $10,000,000.
    

          (b)      The provisions of this Section 10.08 shall not prevent the
Company or any Subsidiary from paying a dividend on Capital Stock of any class
within 60 days after the declaration thereof if, on the date of declaration,
the Company or such Subsidiary could have paid such dividend in compliance with
the other provisions of this Section 10.08 and the other provisions of this
Indenture.  The aggregate amount of dividends paid by the Company or any
Subsidiary pursuant to this subsection shall be included in all subsequent
computations under subsection (a) above.

   
          (c)      The provisions of this Section 10.08 shall not prevent the
Company from paying regular dividends on the Preferred Stock.  The aggregate
amount of dividends paid by the Company pursuant to this subsection shall not
be included in subsequent computations under subsection (a) above.
    

          (d)      The provisions of this Section 10.08 shall not prevent the
Company or any Subsidiary from repurchasing or redeeming shares of Capital
Stock or Subordinated Indebtedness of the Company out of the net cash proceeds
from the substantially concurrent issuance or sale (other than to a Subsidiary
except a Non-Recourse Subsidiary) of Capital Stock of the Company (other than
Redeemable Stock); provided, that the net cash proceeds from such sale are
excluded from clause (iii)(B) of subsection (a) above to the extent such
proceeds are applied to purchase or redeem such Capital Stock or Subordinated
Indebtedness.  The aggregate amount of Restricted Payments made by the Company
or any Subsidiary pursuant to this subsection shall not be included in
subsequent computations under subsection (a) above.

          (e)      The provisions of this Section 10.08 shall not prevent the 
Company or any Subsidiary from exchanging, repurchasing or redeeming
Subordinated Indebtedness of the Company (the "Retired Indebtedness") solely in
exchange for, or out of the net cash proceeds from the substantially concurrent
sale of, Subordinated Indebtedness of the Company, so long as such new
Subordinated Indebtedness (i) is subordinated to the Notes at least to the same
extent as the Retired Indebtedness, (ii) is scheduled to mature no earlier than
the scheduled maturity of the Retired Indebtedness and (iii) has an Average
Life at the time incurred that is greater than the Average Life of the Retired
Indebtedness.  The aggregate amount of consideration paid by the Company
pursuant to this subsection shall not be included in subsequent computations
under subsection (a) above.





                                     II-10
<PAGE>   46
          SECTION 10.10.   Limitation on Subsidiary Indebtedness and Preferred
Stock.  The Company shall not permit any Subsidiary to, directly or indirectly,
create, incur, assume, Guarantee or otherwise become liable with respect to the
payment of (collectively, "incur"), any Indebtedness or to issue or suffer to
exist any preferred stock, other than:

   
                 (i)      Indebtedness described in clauses (ii), (iii), (iv),
          (v), (vi), (viii), (ix), (xi), (xii), (xiii) and (xiv) of the
          definition of "Permitted Indebtedness";
    

                 (ii)     Indebtedness of a Subsidiary which represents the
          assumption by such Subsidiary of Indebtedness (other than Non-Recourse
          Indebtedness) of another Subsidiary in connection with a merger of
          such Subsidiaries; provided that no Subsidiary or any successor (by
          way of merger) thereto existing on the Issue Date shall assume or
          otherwise incur any Indebtedness of an entity which is not a
          Subsidiary on the Issue Date, except to the extent that such
          Subsidiary would be permitted to incur such Indebtedness under this
          Indenture;

                 (iii)    Indebtedness or preferred stock of any Person
          existing at the time such Person becomes a Subsidiary; provided, that
          such Indebtedness was not incurred in anticipation of such corporation
          becoming a Subsidiary and would otherwise be permitted pursuant to
          Section 10.09(a);

                 (iv)     Indebtedness or preferred stock issued to and held by
          the Company or a Wholly Owned Subsidiary other than a Non-Recourse
          Subsidiary, so long as the transfer of such Indebtedness or preferred
          stock to a Person other than the Company or any Wholly Owned
          Subsidiary would be deemed to constitute the issuance of such
          Indebtedness or preferred stock by the issuer thereof;

                 (v)      Indebtedness or preferred stock issued in exchange
          for, or the proceeds of which are used to refinance, repurchase or
          redeem, Indebtedness or preferred stock described in clause (iii) of
          this Section 10.10 or in clause (ii) of the definition of "Permitted
          Liens" (the "Retired Indebtedness or Stock"), provided that the
          Indebtedness or the preferred stock so issued has (A) a principal
          amount or liquidation value, as the case may be, not in excess of the
          principal amount or liquidation value of the Retired Indebtedness or
          Stock, (B) a final redemption date later than the stated maturity or
          final redemption date (if any) of the Retired Indebtedness or Stock
          and (C) an Average Life at the time of issuance of such Indebtedness
          or preferred stock that is greater than the Average Life of the
          Retired Indebtedness or Stock; or

   
                 (vi)     Indebtedness or preferred stock of a Subsidiary,
          which, when combined with (A) the aggregate amount of all other
          outstanding Indebtedness of the Subsidiaries plus the aggregate
          liquidation value of all preferred stock of any Subsidiary, in either
          case excluding any Non-Recourse Subsidiary (other than Indebtedness
          secured by Liens described under clauses (iii), (x), (xv) and (xix)
          of the definition of "Permitted Liens"), plus (B) the aggregate amount
          of all Indebtedness of the Company secured by Liens (other than such
          Indebtedness secured by Liens described under clauses (ii), (iii),
          (x), (xv) and (xix) of the definition of "Permitted Liens"), plus (C)
          the aggregate amount of all Capital Lease Obligations of the Company
          and the Subsidiaries, shall not exceed 10% of the Company's
          Consolidated Net Tangible Assets.
    





                                     II-11
<PAGE>   47
         SECTION 5.01.   Events of Default.

         ...

   
         (5)     a default under any bond, debenture, note or other evidence of
Indebtedness (other than Non-Recourse Indebtedness) of the Company or any
Subsidiary, or under any mortgage, indenture or instrument under which there
may be issued or by which there may be secured or evidenced any Indebtedness
(other than Non-Recourse Indebtedness) of the Company or any Subsidiary,
whether such Indebtedness now exists or shall hereafter be created, which
default shall involve the failure to pay principal on such Indebtedness at the
final maturity thereof or which shall have resulted in such Indebtedness
becoming or being declared due and payable prior to the date on which it would
otherwise become due and payable in an amount in excess of $10,000,000 for any
Indebtedness individually or in the aggregate; or
    

   
         (6)     the entry by a court of competent jurisdiction of one or more
judgments or orders against the Company or any Subsidiary in an uninsured or
unindemnified aggregate amount in excess of $10,000,000 which remain
undischarged or unsatisfied for a period of 60 consecutive days after the right
to appeal them has expired; or
    

   
         (7)     the entry of a decree or order for relief in respect of the
Company or any Material Subsidiary by a court of competent jurisdiction in the
premises in an involuntary case under the Federal bankruptcy laws, as now or
hereafter constituted, or any other Federal or state bankruptcy, insolvency or
other similar law, or appointing a receiver, liquidator, assignee, custodian,
trustee, sequestrator (or other similar official) of the Company or any
Material Subsidiary or of any substantial part of the Property of the Company
or any Material Subsidiary, or ordering the winding up or liquidation of the
affairs of the Company or any Material Subsidiary, and the continuance of any
such decree or order unstayed and in effect for a period of 60 consecutive
days; or
    

   
         (8)     (a) the commencement by the Company or any Material Subsidiary
of a voluntary case under the Federal bankruptcy laws, as now or hereafter
constituted, or any other applicable Federal or state bankruptcy, insolvency or
other similar law, or (b) the consent by the Company or any Material Subsidiary
to the entry of an order for relief in an involuntary case under any such law
or to the appointment of a receiver, liquidator, assignee, custodian, trustee,
sequestrator (or other similar official) of the Company or any Material
Subsidiary or of any substantial part of the of Property the Company or any
Material Subsidiary, or the making by the Company or any Material Subsidiary of
an assignment for the benefit of creditors, or the admission by the Company or
any Material Subsidiary in writing of its inability to pay its debts generally
as they become due, or the taking of corporate action by the Company or any
Material Subsidiary in furtherance of any such action.
    





                                    II-12


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