Document:

Exhibit 4.8

 

THIS SECOND SUPPLEMENTAL INDENTURE, dated
as of February 18, 1997, is between LOEWS CORPORATION, a Delaware corporation (the “Company”), and THE CHASE MANHATTAN
BANK, a New York corporation, successor by merger to Chemical Bank, successor by merger to Manufacturers Hanover Trust Company,
as trustee (herein called the “Trustee”).

 

Preliminary
Statement

 

The Company and the Trustee have entered
into an Indenture dated as of December 1, 1985 and a First Supplemental Indenture, dated as of February 18, 1997 (such Indenture,
as supplemented is herein called the “Indenture”).

 

Capitalized terms used but not otherwise
defined herein, shall have the meanings given them in the Indenture.

 

Section 901 of the Indenture provides that,
under certain circumstances, a supplemental indenture may be entered into by the Company and the Trustee without the consent of
any Holders of Debt Securities. In accordance with the terms of Sections 901(6) and 901(9) of the Indenture, the Company has, by
Board Resolution, authorized this Second Supplemental Indenture. The Trustee has determined that this Second Supplemental Indenture
is in form satisfactory to it. This Second Supplemental Indenture modifies the terms of the Indenture only insofar as they are
applicable to Debt Securities issued under the Indenture after the date of this Second Supplemental Indenture.

 

All things necessary to make this Second
Supplemental Indenture a valid agreement of the Company and the Trustee and a valid amendment of and supplement to the Indenture
have been done.

 

NOW, THEREFORE, THIS SECOND SUPPLEMENTAL
INDENTURE WITNESSETH:

 

For and in consideration of the premises,
it is mutually covenanted and agreed, for the equal and proportionate benefit of all Holders of the Debt Securities issued under
the Indenture from and after the date of this Second Supplemental Indenture, as follows:

 

1.       The
word “and” following Section 301(10) will be deleted, Section 301(11) will be renumbered Section 301(12), and a new
Section 301(11) will be added, as follows:

 

(11)       the
exchange or conversion of the Debt Securities of any series, at the option of the Holders thereof, for or into new Debt Securities
of a different series or other securities or other property, including shares of capital stock of the Company or any subsidiary
of the Company or securities directly or indirectly convertible into or exchangeable for any such shares; and

 

2.       Section
501(5) will be modified by replacing the amount of “$50,000,000” in the sixth line thereof with “$100,000,000.”

 

3.       This
Second Supplemental Indenture does not modify the Indenture in any respect with regard to Debt Securities issued thereunder prior
to the date of this Second Supplemental Indenture, and the terms of such Debt Securities will not be modified by this Second Supplemental
Indenture.

 

This instrument may be executed in any
number of counterparts, each of which so executed shall be deemed to be an original, but all such counterparts shall together constitute
but one and the same instrument.

 

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

 

[SEAL]

 

	 	LOEWS CORPORATION
	 	 
	 	 
	 	By:	/s/ Gary W. Garson
	 	 	Its:	Vice President

 

 

	 	THE CHASE MANHATTAN BANK
	 	 
	 	 
	 	By:	/s/ Ronald Halleran
	 	 	Its:	Second Vice President

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	STATE OF NEW YORK	)
	 	) ss.:
	COUNTY OF NEW YORK	)

 

 

On the 18th day of February, 1997, before
me personally came Ronald Halleran to me known, who, being by me duly sworn, did depose and say that he resides at New York, New
York; that he is a Second Vice President of THE CHASE MANHATTAN BANK, one of the banking corporations described herein and that
executed the above instrument; that he knows the seal of said corporation; that the seal affixed to said instrument is such corporate
seal; that it was so affixed by the Board of Directors of said corporation and that he signed his name thereto by order of the
Board of Directors of said corporation.

 

IN WITNESS WHEREOF, I have hereunto set
my hand and affixed my official seal the day and year in this certificate first above written.

 

[NOTARIAL SEAL]

 

	 	 
	 	By:	/s/ Della K. Benjamin
	 	 	 	Notary Public

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	STATE OF NEW YORK	)
	 	ss.:
	COUNTY OF NEW YORK	)

 

On the 19th day of February, 1997, before
me personally came Gary W. Garson, to me known, who, being by me duly sworn, did depose and say that he resides at New York, New
York; that he is a Vice President of LOEWS CORPORATION, the corporation described herein and that executed the above instrument;
that he knows the seal of said corporation; that the seal affixed to said instrument is such corporate seal; that it was so affixed
by the Board of Directors of said corporation and that he signed his name thereto by order of the Board of Directors of said corporation.

 

IN WITNESS WHEREOF, I have hereunto set
my hand and affixed my official seal the day and year in this certificate first above written.

 

[NOTARIAL SEAL]

 

	 	 
	 	By:	/s/ Carol Doktorski
	 	 	 	Notary Public

    4Exhibit
4.9

 

THIS THIRD
SUPPLEMENTAL INDENTURE, dated as of September 16, 1997, is between LOEWS CORPORATION, a Delaware corporation (the “Company”),
and THE CHASE MANHATTAN BANK, a New York corporation, successor by merger to Chemical Bank, successor by merger to Manufacturers
Hanover Trust Company, as trustee (herein called the “Trustee”).

 

PRELIMINARY
STATEMENT

 

The Company
and the Trustee have entered into an Indenture dated as of December 1, 1985 and a First and Second Supplemental Indenture thereto,
each dated as of February 18, 1997 (such Indenture, as supplemented is herein called the “Indenture”).

 

Capitalized
terms used but not otherwise defined herein, shall have the meanings given them in the Indenture. Section 201 of the Indenture
permits the form of the Debt Securities of any series to be established pursuant to an indenture supplemental to the Indenture.

 

Section 301
of the Indenture permits the terms of the Debt Securities of any series to be established in an indenture supplemental to the
Indenture.

 

Section 901(6)
of the Indenture provides that a supplemental indenture may be entered into by the Company and the Trustee without the consent
of any Holders of Debt Securities to establish the form and terms of Debt Securities of any series as permitted by Sections 201
and 301. In accordance with the terms of Sections 901(6) of the Indenture, the Company has, by Board Resolution, authorized this
Third Supplemental Indenture. The Trustee has determined that this Third Supplemental Indenture is in form satisfactory to it.

 

All things
necessary to make this Third Supplemental Indenture a valid agreement of the Company and the Trustee and a valid amendment of
and supplement to the Indenture have been done.

 

NOW, THEREFORE,
THIS THIRD SUPPLEMENTAL INDENTURE WITNESSETH:

 

For and in
consideration of the premises, it is mutually covenanted and agreed, for the equal and proportionate benefit of all Holders of
the Debt Securities of the series to be created hereby, as follows:

 

1. Definitions

 

For all purposes
of the Indenture and this Third Supplemental Indenture, with respect to the Securities of the series created hereby, except as
otherwise expressly provided or unless the context otherwise requires:

 

    

     

    

The “Average
Market Value” of the Diamond Offshore Common Stock on any date of computation means the arithmetic average of the daily
volume weighted average price of the Diamond Offshore Common Stock, as reported on the New York Stock Exchange Consolidated Tape,
or if the Diamond Offshore Common Stock is not then listed on the New York Stock Exchange, as reported by the principal securities
exchange or interdealer quotations system on which the Diamond Offshore Common Stock is then traded, for the 30-Trading Day period
ending two Trading Days prior to such date of computation as computed by the Quotation Agent.

 

The “Average
Market Value Amount” per $1,000 principal amount of Notes means the greater of (a) $1,000 and (b) the product of (i)
the then-prevailing Exchange Rate and (ii) the Average Market Value of the Diamond Offshore Common Stock as of the date of computation.

 

“Cash
Distribution” means the distribution by Diamond Offshore to all holders of Diamond Offshore Common Stock of cash, other
than any cash that is distributed upon a merger or consolidation to which ‎Section
4.11 of this Third Supplemental Indenture applies or as part of a distribution referred to in paragraph ‎(d)
of ‎Section 4.04 of this Third Supplemental Indenture.

 

“Closing
Price” of the Diamond Offshore Common Stock on any date means the price, as of the close of business on such date, of
the Diamond Offshore Common Stock, as reported on the New York Stock Exchange Consolidated Tape, or if the Diamond Offshore Common
Stock is not then listed on the New York Stock Exchange, as reported by the principal securities exchange or interdealer quotation
system on which the Diamond Offshore Common Stock is then traded.

 

“common
stock” includes any stock of any class of capital stock which has no preference in respect of dividends or of amounts
payable in the event of any voluntary or involuntary liquidation, dissolution or winding up of the issuer thereof and which is
not subject to redemption by the issuer thereof.

 

“Determination
Date” means, in the case of a dividend or other distribution, including the issuance of rights, options or warrants,
to shareholders, the date fixed for the determination of shareholders entitled to receive such dividend or other distribution
and, in the case of a tender offer, the last time that tenders could have been made pursuant to such tender offer.

 

“Diamond
Offshore” means Diamond Offshore Drilling, Inc., a Delaware corporation and a Subsidiary of the Company.

 

“Diamond
Offshore Common Stock” means the Common Stock, $.01 par value per share, of Diamond Offshore authorized at the date
of this instrument as originally executed. Subject to the provisions of ‎Section
4.11 of this Third Supplemental Indenture, shares issuable on exchange of Notes shall include only shares of Common Stock or shares
of any class or classes of common stock resulting from any reclassification or reclassifications thereof; provided, however, that
if at any time there shall be more than

 

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one such
resulting class, the shares so issuable on exchange of Notes shall include shares of all such classes, and the shares of each
such class then so issuable shall be substantially in the proportion which the total number of shares of such class resulting
from all such reclassifications bears to the total number of shares of all such classes resulting from all such reclassifications.

 

“Excess
Purchase Payment” means the excess, if any, of (i) the amount of cash plus the fair market value (as determined by the
Board of Directors, whose determination shall be conclusive and described in a Board Resolution) of any non-cash consideration
required to be paid with respect to one share of Diamond Offshore Common Stock acquired or to be acquired in a tender offer made
by Diamond Offshore or any subsidiary of Diamond Offshore for all or any portion of the Diamond Offshore Common Stock over (ii)
the current market price per share as defined in ‎Section
4.4 for purposes of ‎Section 4.4(6).

 

“Exchange
Rate” has the meaning set forth in ‎Section 4.1
of this Third Supplemental Indenture.

 

“Market
Capitalization” means, with respect to a specified date, the product of (i) the current market price per share (determined
as provided in paragraph ‎(7) of ‎Section
4.4 of this Third Supplemental Indenture) of the Diamond Offshore Common Stock as of such date times (ii) the number of shares
of Diamond Offshore Common Stock outstanding on such date.

 

“Notes”
means any Debt Securities of the series of Debt Securities entitled “3__% Exchangeable Subordinated Notes due 2007”
created by this Third Supplemental Indenture.

 

“Quotation
Agent” means the Trustee and its successors or substitutes.

 

“Trading
Day” means any day on which the Diamond Offshore Common Stock (i) is not suspended from trading on the principal securities
exchange or interdealer quotation system on which it is traded at the close of business and (ii) has traded at least once on such
principal securities exchange or interdealer quotation system.

 

2.
Form of Notes

 

2.1.     
The Notes shall be in the form set forth in this Section.

 

2.2.     
Form of Face of Notes.

 

[IF THE SECURITY IS A GLOBAL SECURITY, THEN INSERT – UNLESS THIS CERTIFICATE IS PRESENTED
BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE COMPANY
OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE &
CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED

 

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REPRESENTATIVE
OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC),
ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER
HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.]

 

LOEWS CORPORATION

 

3__% EXCHANGEABLE
SUBORDINATED NOTE DUE 2007

 

	No. _____________ 	$_____

 

CUSIP NO. - ________________

 

LOEWS CORPORATION,
a corporation duly organized and existing under the laws of Delaware (herein called the “Company”, which term includes
any successor Person under the Indenture referred to on the reverse hereof), for value received, hereby promises to pay to _______________,
or registered assigns, the principal sum of _____________ Dollars ($_____) on September 15, 2007 and to pay interest thereon,
from September 19, 1997, or from the most recent Interest Payment Date to which interest has been paid or duly provided for, semi-annually
on March 15 and September 15 in each year, commencing March 15, 1998, at the rate of 3__% per annum, until the principal hereof
is due, and at the rate of 3__% per annum on any overdue principal and premium, if any, and, to the extent permitted by law, on
any overdue interest. The interest so payable, and punctually paid or duly provided for, on any Interest Payment Date will, as
provided in the Indenture, be paid to the Person in whose name this Note (or one or more Predecessor Securities) is registered
at the close of business on the Regular Record Date for such interest, which shall be the March 1 or September 1 (whether or not
a Business Day), as the case may be, next preceding such Interest Payment Date. Except as otherwise provided in the Indenture,
any such interest not so punctually paid or duly provided for will forthwith cease to be payable to the Holder on such Regular
Record Date and may either be paid to the Person in whose name this Note (or one or more Predecessor Securities) is registered
at the close of business on a Special Record Date for the payment of such Defaulted Interest to be fixed by the Company, notice
whereof shall be given to Holders of Notes not less than 10 days prior to such Special Record Date, or be paid at any time in
any other lawful manner not inconsistent with the requirements of any securities exchange on which the Notes may be listed, and
upon such notice as may be required by such exchange, all as more fully provided in the Indenture. Payment of the principal of
(and premium, if any, on) this Note shall be made upon the surrender of this Note at the office or agency of the Company as may
be designated by it for such purpose in the Borough of Manhattan, The City of New York, in such coin or currency of the United
States of America as at the time of payment shall be legal tender for the payment of public and private debts, or at such other
offices or agencies as the Company may designate. Payment of interest on this Note may be made by check mailed to the address
of the Person entitled thereto as such address shall appear in the Security Register.

 

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Reference
is hereby made to the further provisions of this Note set forth on the reverse hereof, which further provisions shall for all
purposes have the same effect as if set forth at this place.

 

Unless the
certificate of authentication hereon has been executed by the Trustee referred to on the reverse hereof by manual signature, this
Note shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purpose.

 

IN WITNESS
WHEREOF, the Company has caused this Note to be duly executed under its corporate seal.

 

Dated:

 

	 	LOEWS CORPORATION
	 	 
	 	 
	 	By:	 
	 	 	Name:
	 	 	Title:

 

Attest:

 

	 	 
	 	By:	 
	 	 	Name:
	 	 	Title:

 

2.3.     
Form of Reverse of Note.

 

This Note is one of a duly authorized issue of debt securities of the Company designated
as its “3__% Exchangeable Subordinated Notes due 2007” (herein called the “Notes”), limited in
aggregate principal amount to $1,150,000,000, issued and to be issued under an Indenture, dated as of December 1, 1985, as supplemented
by a First and Second Supplemental Indenture, each dated as of February 18, 1997, and a Third Supplemental Indenture dated as
of September 16, 1997 (herein called the “Indenture”), between the Company and The Chase Manhattan Bank, as
Trustee (herein called the “Trustee”), which term includes any successor trustee under the Indenture), to which
Indenture and all indentures supplemental thereto reference is hereby made for a statement of the respective rights, limitations
of rights, duties and immunities thereunder of the Company, the Trustee, the holders of Senior Indebtedness and the Holders of
the Notes and of the terms upon which the Notes are, and are to be, authenticated and delivered.

 

The Notes
are subject to redemption upon not less than 30 nor more than 60 days’ notice by mail, at any time on or after September
25, 2002, as a whole or in part, at the election of the Company, at the following Redemption Prices (expressed as percentages

 

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of the principal
amount) if redeemed during the 12-month period beginning September 15 of the years indicated:

 

	Year
	Redemption
Price

	2002	101.5625%
	2003	101.2500%
	2004	100.9375%
	2005	100.6250%
	2006	100.3125%

 

and on September 15, 2007 at
a Redemption Price equal to 100% of the principal amount, together in the case of any such redemption with accrued interest to
the Redemption Date, but interest installments whose Stated Maturity is on or prior to such Redemption Date will be payable to
the Holders of such Notes, or one or more Predecessor Securities, of record at the close of business on the relevant Record Dates
referred to on the face hereof, all as provided in the Indenture.

 

Subject to
and upon compliance with the provisions of the Indenture, and subject to the Company’s rights to suspend exchanges and to
elect cash settlement as set forth below, the Holder of this Note is entitled at any time on or after October 1, 1998 and before
the close of business on September 15, 2007 (or, in case this Note or a portion hereof is called for redemption, then in respect
of this Note or such portion hereof, as the case may be, from October 1, 1998 until and including, but (unless the Company defaults
in making the payment due upon redemption) not after, the close of business on the Redemption Date)) to exchange this Note (or
any portion of the principal amount hereof that is an integral multiple of $1,000), into fully paid and nonassessable shares (calculated
as to each exchange to the nearest 1/100 of a share) of Common Stock, $.01 par value per share (“Diamond Offshore Common
Stock”) of Diamond Offshore Drilling, Inc. (“Diamond Offshore”) at the rate of 15.3757 shares of
Diamond Offshore Common Stock for each $1,000 principal amount of Note (or at the current adjusted rate if an adjustment has been
made as provided in the Indenture) by surrender of this Note, duly endorsed or assigned to the Company or in blank to the Company
at the office or agency of the Company in the Borough of Manhattan, The City of New York or at any other office or agency of the
Company maintained for such purpose, accompanied by written notice to the Company that the Holder hereof elects to exchange this
Note (or if less than the entire principal amount hereof is to be exchanged, specifying the portion hereof to be exchanged) and,
in case such surrender shall be made during the period from the close of business on any Regular Record Date next preceding any
Interest Payment Date to the opening of business on such Interest Payment Date, also accompanied by payment in New York Clearing
House (next day) funds (or other funds acceptable to the Company) of an amount equal to the interest payable on such Interest
Payment Date on the principal amount of this Note then being exchanged, provided that, if this Note or any portion hereof has
been called for redemption on a Redemption Date occurring during the period from the close of business on any Regular Record Date
next preceding any Interest Payment Date to the opening of business on such Interest Payment Date and is surrendered for exchange
during such period, then the Holder of this Note who exchanges this Note or any portion hereof during such period will be entitled
to receive the interest

 

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accruing
on the principal amount of this Note or such portion thereof so called for redemption and then being exchanged from the Interest
Payment Date next preceding the date of such exchange to such succeeding Interest Payment Date and shall not be required to pay
such interest upon surrender of this Note for exchange. Subject to the provisions of the preceding sentence, no payment or adjustment
is to be made on exchange for interest accrued hereon from the Interest Payment Date next preceding the day of exchange, or for
dividends on the Diamond Offshore Common Stock issued on exchange hereof. Interest payable on any Interest Payment Date in respect
of this Note or any portion hereof surrendered for exchange on or after such Interest Payment Date shall be paid to the Holder
of such Note as of the Regular Record Date next preceding such Interest Payment Date, notwithstanding the exercise of the right
of exchange. No fractions of shares or scrip representing fractions of shares will be issued on exchange, but instead of any fractional
interest, the Company shall pay a cash adjustment as provided in the Indenture or, at its option, the Company shall round up to
the next higher whole share.

 

The Exchange
Rate is subject to adjustment as provided in the Indenture. The Indenture also provides that in case of certain consolidations
or mergers to which Diamond Offshore is a party or the conveyance, transfer, sale or lease of all or substantially all of the
properties and assets of Diamond Offshore, the Indenture shall be amended, without the consent of any Holders of Notes, so that
this Note, if then Outstanding, will be exchangeable thereafter, during the period this Note shall be exchangeable as specified
above, only into the kind and amount of securities, cash and other property receivable upon such consolidation, merger, conveyance,
transfer, sale or lease (including any Diamond Offshore Common Stock retainable) by a holder of the number of shares of Diamond
Offshore Common Stock into which this Note could have been exchanged immediately prior to such consolidation, merger, conveyance,
transfer, sale or lease (assuming such holder of Diamond Offshore Common Stock failed to exercise any rights of election and received
per share the kind and amount received per share by a plurality of non-electing shares and further assuming, if such consolidation,
merger, conveyance, transfer, sale or lease is prior to October 1, 1998 that this Note was exchangeable immediately prior to the
time of such occurrence at the initial Exchange Rate specified above as adjusted from the original issue date of the Notes to
such time as provided in the Indenture). No adjustment in the Exchange Rate will be made until such adjustment would require an
increase or decrease of at least one percent of such rate, provided that any adjustment that would otherwise be made will be carried
forward and taken into account in the computation of any subsequent adjustment.

 

The Company
may at any time suspend the right of exchange attaching to the Notes, by giving one business day’s notice of such suspension
to the Trustee (which notice may be given by Diamond Offshore on behalf of the Company), provided that, (i) the total period during
which such right of exchange is suspended shall not exceed 90 consecutive days at any one time or a total of 120 days in any 12-month
period; and (ii) no such suspension may be in effect during the 14-day period preceding any Redemption Date or the final maturity
date of the Notes. In addition, the right of Holders to exchange will be suspended if the Company has irrevocably elected to pay
in cash the Average

 

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Market Value
Amount in respect of all Notes delivered for exchange prior to a Redemption Date or the final maturity date in respect of the
Notes.

 

At any time
prior to September 2, 2007, and unless the Company shall have previously elected in connection with a call for redemption or at
maturity to pay in cash the Average Market Value Amount upon any exchange prior to the applicable Redemption Date or final maturity
date, as set forth below, the Company may elect to make a cash settlement in respect of any Note surrendered for exchange by delivering
notice thereof to the tendering Holder not more than five Trading Days after such Note is surrendered for exchange. Such cash
settlement shall be in an amount, per $1,000 principal amount of Notes delivered for exchange, equal to the greater of (A) $1,000
and (B) the product of (i) the then-prevailing Exchange Rate and (ii) the average of the Closing Price of the Diamond Offshore
Common Stock on the five Trading Days commencing two Trading Days after delivery by the Company of such notice to such Holder.
The Company will pay such cash settlement amount as promptly as practicable after the completion of such five Trading Day period.

 

The Company
may elect, in connection with a redemption of Notes or the final maturity of the Notes, to satisfy its obligations to Holders
who elect to exchange their Notes for Diamond Offshore Common Stock by cash payment of the Average Market Value Amount. If the
Company makes such an election, Holders of Notes will no longer be entitled to receive Diamond Offshore Common Stock in exchange
for their Notes. The Company may make such an election, in respect of any Notes to be redeemed on a Redemption Date or repaid
on the final maturity date, by giving an irrevocable notice thereof to the Holders not later than the 35th Trading Day prior to
such Redemption Date or final maturity date, in which case the Company will be obligated to pay the Average Market Value Amount
in respect of all Notes to be redeemed or repaid on such Redemption Date or final maturity date to Holders who elect to exchange
their Notes for Diamond Offshore Common Stock. If such notice is delivered in connection with a Redemption Date, it shall be required
to be given not later than 35 Trading Days prior to the Redemption Date.

 

[IF NOT A
GLOBAL SECURITY INSERT – In the event of redemption or exchange of this Note in part only, a new Note or Notes for the unredeemed
or unexchanged portion hereof will be issued in the name of the Holder hereof.]

 

[IF A GLOBAL
SECURITY INSERT – In the event of a deposit or withdrawal of an interest in this Note (including upon an exchange, transfer,
redemption or exchange of this Note in part only), the Security Registrar, upon receipt of notice of such event from the Depositary’s
custodian for this Note, shall make an adjustment on its records to reflect an increase or decrease of the Outstanding principal
amount of this Note resulting from such deposit or withdrawal, as the case may be.]

 

The indebtedness
evidenced by this Note is, to the extent and in the manner provided in the Indenture, subordinate and subject in right of payment
to the prior payment in full of all Senior Indebtedness of the Company, and this Note is issued subject to such provisions of
the Indenture with respect thereto. Each Holder of this Note,

 

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by accepting
the same, (a) agrees to and shall be bound by such provisions, (b) authorizes and directs the Trustee on his behalf to take such
action as may be necessary or appropriate to effectuate the subordination so provided and (c) appoints the Trustee his attorney-in-fact
for any and all such purposes.

 

If an Event
of Default shall occur and be continuing, the principal of all the Notes may be declared due and payable in the manner and with
the effect provided in the Indenture.

 

The Indenture
permits, with certain exceptions as therein provided, the amendment thereof and the modification of the rights and obligations
of the Company and the rights under the Indenture of the Holders of Debt Securities issued thereunder at any time by the Company
and the Trustee with the consent of the Holders of a majority in principal amount of the Outstanding Debt Securities affected
thereby. The Indenture also contains provisions permitting the Holders of specified percentages in principal amount of the Notes
at the time Outstanding, on behalf of the Holders of all the Notes, to waive compliance by the Company with certain provisions
of the Indenture and certain past defaults under the Indenture and their consequences. Any such consent or waiver by the Holder
of this Note shall be conclusive and binding upon such Holder and upon all future Holders of this Note and of any Note issued
in exchange herefor or in lieu hereof, whether or not notation of such consent or waiver is made upon this Note or such other
Note.

 

No reference
herein to the Indenture and no provision of this Note or of the Indenture shall alter or impair the obligation of the Company,
which is absolute and unconditional, to pay the principal of and premium, if any, and interest on this Note at the times, places
and rate, and in the coin or currency, herein prescribed or to exchange this Note for Diamond Offshore Common Stock or cash as
and when provided in the Indenture.

 

As provided
in the Indenture and subject to certain limitations therein set forth, the transfer of Notes is registrable on the Note Register
upon surrender of a Note for registration of transfer at the office or agency of the Company in the Borough of Manhattan, The
City of New York, and at such other offices or agencies as the Company may designate, duly endorsed by, or accompanied by a written
instrument of transfer in form satisfactory to the Company and the Security Registrar duly executed by, the Holder thereof or
his attorney duly authorized in writing, and thereupon one or more new Notes, of authorized denominations and for the same aggregate
principal amount, will be issued to the designated transferee or transferees.

 

The Notes
are issuable only in registered form without coupons in denominations of $1,000 and any integral multiple thereof. As provided
in the Indenture and subject to certain limitations therein set forth, Notes are exchangeable for a like aggregate principal amount
of Notes of a different authorized denomination, as requested by the Holder surrendering the same.

 

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No service
charge shall be made for any such registration of transfer or exchange, but the Company may require payment of a sum sufficient
to recover any tax or other governmental charge payable in connection therewith.

 

Prior to
due presentation of a Security for registration of transfer, the Company, the Trustee and any agent of the Company or the Trustee
may treat the Person in whose name such Note is registered, as the owner thereof for all purposes, whether or not such Note be
overdue, and neither the Company, the Trustee nor any such agent shall be affected by notice to the contrary.

 

THE INDENTURE
AND THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

 

All terms
used in this Note which are defined in the Indenture shall have the meanings assigned to them in the Indenture.

 

2.4.     
Form of Trustee’s Certificate of Authentication.

 

This is one of the Notes referred to in the within-mentioned
Indenture.

 

	 	THE CHASE MANHATTAN BANK,

    as Trustee
	 	 
	 	 
	 	By:	 
	 	 	Authorized Signatory
	 	 	 

 

2.5.     
Form of Exchange Notice.

 

EXCHANGE
NOTICE

 

The undersigned
Holder of this Note hereby irrevocably exercises the option to exchange this Note, or any portion of the principal amount hereof
(which is an integral multiple of $1,000) below designated, into shares of Common Stock of Diamond Offshore Drilling, Inc. in
accordance with the terms of the Indenture (including the rights of the Company to elect cash settlement) referred to in this
Note, and directs that such shares, together with a check in payment for any fractional share, or a check in payment of the appropriate
cash settlement amount, if applicable, and any Notes representing any unexchanged principal amount hereof, be delivered to and,
in the case of shares, be registered in the name of the undersigned unless a different name has been indicated below. If such
shares of Common Stock or Notes are to be registered in the name of a Person other than the undersigned, the undersigned will
pay all transfer taxes and other governmental charges payable with respect thereto. Any amount required to be paid by the undersigned
on account of interest accompanies this Note.

 

    10

     

    

	Dated:		 
	 	 	Signature

 

If shares
or Notes are to be registered in the name of a Person other than the Holder, please print such Person’s name and address:

 

	Name:	 	 

 

	Address	 	 
	 	 	 

 

	Social Security or
other Taxpayer Identification Number, if any	 	 

 

 

If only a
portion of the Notes is to be exchanged, please indicate:

 

		1.	Principal
amount to be exchanged: $_________

 

		2.	Principal amount and denomination
                                         of Notes representing unexchanged

                                         principal amount to be issued:

 

Amount: $_________

 

Denominations: $_________

(any integral multiple of $1,000)

 

	 

 

Signature
must be guaranteed by an eligible Guarantor Institution (banks, stockbrokers, savings and loan associations and credit unions)
with membership in an approved signature medallion program pursuant to Securities and Exchange Commission Rule 17Ad-15 if cash
or Common Stock is to be delivered other than to, and in the name of, the registered Holder.

 

[Signature
Guarantee]

 

3. Title and Terms

 

There shall
be a series of Debt Securities designated as the “3__% Exchangeable Subordinated Notes due 2007” of the Company. Their
Stated Maturity shall be September 15, 2007 and they shall bear interest at the rate of 3__% per annum, from September 19, 1997
or from the most recent Interest Payment Date to which interest has been paid or duly provided for, as the case may be, payable
semi-annually on March 15 and September 15, commencing March 15, 1998 until the principal thereof is paid or made available for
payment. The interest so payable, and punctually paid or duly provided for, on any Interest Payment Date will be paid to the Person
in whose name the Notes (or one or more Predecessor Securities) are registered at the close of business on the Regular Record
Date for such interest, which shall be the March 1 or September 1

 

    11

     

    

(whether
or not a Business Day), as the case may be, next preceding such Interest Payment Date.

 

The aggregate
principal amount of Notes which may be authenticated and delivered under this Third Supplemental Indenture is limited to $1,150,000,000,
except for Notes authenticated and delivered upon registration or transfer of, or in exchange for, or in lieu of, other Notes
pursuant to Section 304, 305, 306, 906 or 1107 of the Indenture.

 

The Notes
shall be redeemable at the option of the Company and exchangeable into shares of Diamond Offshore Common Stock at the option of
the Holder, subject to the Company’s right to suspend exchanges and to elect cash settlement (including by payment of the
Average Market Value Amount in connection with a redemption of Notes or final maturity of the Notes), in each case in accordance
with the terms set forth in the form of Note and in this Third Supplemental Indenture.

 

The Securities
of this series shall not be subject to a sinking fund.

 

The Notes
of this series are not subject to defeasance at the option of the Company pursuant to Article Fifteen of the Indenture.

 

4. Exchange
of Notes

 

4.1.     
Exchange Privilege and Exchange Rate; Suspension of Exchanges; Cash Settlement.

 

Subject to and upon compliance with
the provisions of this Section, at the option of the Holder thereof, any Note or any portion which is $1,000 or an integral multiple
thereof may be exchanged into fully paid and nonassessable shares (calculated as to each exchange to the nearest 1/100th of a
share) of Diamond Offshore Common Stock at the Exchange Rate, determined as hereinafter provided, in effect at the time of exchange.
Such exchange right shall commence on October 1, 1998 and shall expire at the close of business on September 15, 2007. In case
a Note or portion thereof is called for redemption at the election of the Company, such exchange right in respect of the Note,
or portion thereof, so called shall expire at the close of business on the Redemption Date unless the Company defaults in making
the payment due upon redemption.

 

The rate
at which shares of Common Stock shall be delivered upon exchange (herein called the “Exchange Rate”) shall
be initially 15.3757 shares of Diamond Offshore Common Stock for each $1,000 principal amount of Notes. The Exchange Rate shall
be adjusted in certain instances as provided in this ‎Section 4.

 

The Company
may at any time suspend the right of exchange attaching to the Notes, by giving one business days’ notice of such suspension
to the Trustee (which notice may be given by Diamond Offshore on behalf of the Company), provided that, (i) the total period during
which such right of exchange is suspended shall not exceed 90 consecutive days at any one time or a total of 120 days in any 12-month
period; and (ii) no such suspension may be in effect during the 14-day period preceding any Redemption Date or the final maturity
date of the Notes. In addition, the right of Holders to exchange

 

    12

     

    

will be suspended
if the Company has irrevocably elected to pay in cash the Average Market Value Amount in respect of all Notes delivered for exchange
prior to Redemption Date or final maturity date in respect of the Notes, as provided in the Notes.

 

At any time
prior to September 2, 2007, and unless the Company shall have previously elected in connection with a call for redemption or at
maturity to pay in cash the Average Market Value Amount upon any exchange prior to the applicable Redemption Date or final maturity
date, as set forth below, the Company may elect to make a cash settlement in respect of any Note surrendered for exchange by delivering
notice thereof to the tendering Holder not more than five Trading Days after such Note is surrendered for exchange. Such cash
settlement shall be in an amount, per $1,000 principal amount of Notes delivered for exchange, equal to the greater of (A) $1,000
and (B) the product of (i) the then-prevailing Exchange Rate and (ii) the average of the Closing Price of the Diamond Offshore
Common Stock on the five Trading Days commencing two Trading Days after delivery by the Company of such notice to such Holder.
The Company will pay such cash settlement amount as promptly as practicable after the completion of such five Trading Day period.

 

4.2.     
Exercise of Exchange Privilege.

 

In order to exercise the exchange privilege, the Holder of any Note to be exchanged
shall surrender such Note, duly endorsed or assigned to the Company or in blank, at any office or agency of the Company maintained
for that purpose pursuant to ‎Section 4.7 of this Third Supplemental Indenture, accompanied by a duly signed exchange notice
substantially in the form provided in ‎Section 2.5 of this Third Supplemental Indenture, stating that the Holder elects to
exchange such Note or, if less than the entire principal amount thereof is to be exchanged, the portion thereof to be exchanged.
Each Note surrendered for exchange (in whole or in part) during the period from the close of business on any Regular Record Date
next preceding any Interest Payment Date to the opening of business on such Interest Payment Date shall (except in the case of
any Note or portion thereof which has been called for redemption on a Redemption Date occurring within such period) be accompanied
by payment in New York Clearing House (next day) funds (or other funds acceptable to the Company) of an amount equal to the interest
payable on such Interest Payment Date on the principal amount of such Note (or portion thereof, as the case may be) being surrendered
for exchange. The interest so payable on any Interest Payment Date with respect to any Note (or portion thereof, if applicable)
which has been called for redemption on a Redemption Date occurring during the period from the close of business on the Regular
Record Date next preceding such Interest Payment Date to the opening of business on such Interest Payment Date, which Note (or
portion thereof, if applicable) so called for redemption is surrendered for exchange (in whole or in part) prior to such Redemption
Date, shall be paid upon such exchange to the Holder of such Note (or portion thereof) as of the exchange date in an amount equal
to the interest that would have been payable on the principal amount of such Note (or portion thereof) so called for redemption
and being exchanged if such principal amount had been exchanged as of the close of business on such Interest Payment Date. The
interest so payable on any Interest Payment Date in respect of any Note (or portion thereof, as the case may be) which has not
been called for redemption on a Redemption Date occurring during the period from the close of business on the Regular Record Date
next preceding such Interest Payment

 

    13

     

    

Date
to the opening of business on such Interest Payment Date, which Note (or portion thereof, as the case may be) not so called for
redemption is surrendered for exchange (in whole or in part) during such period, shall be paid to the Holder of such Note as of
such Regular Record Date. Interest payable on any Interest Payment Date in respect of any Note surrendered for exchange on or
after such Interest Payment Date shall be paid to the Holder of such Note as of the Regular Record Date next preceding such Interest
Payment Date, notwithstanding the exercise of the right of exchange. Except as provided in this paragraph, no cash payment or
adjustment shall be made upon any exchange on account of any interest accrued from the Interest Payment Date next preceding the
exchange date in respect of any Note (or part thereof, as the case may be) surrendered for exchange, or on account of any dividends
on the Diamond Offshore Common Stock issued upon exchange.

 

Notes shall
be deemed to have been exchanged immediately prior to the close of business on the day of surrender of such Notes for exchange
in accordance with the foregoing provisions, and at such time the rights of the Holders of such Notes as Holders shall cease,
and the Person or Persons entitled to receive the Diamond Offshore Common Stock issuable upon exchange shall be treated for all
purposes as the record holder or holders of such Diamond Offshore Common Stock at such time. Within five Trading Days of the exchange
date, the Company shall issue and deliver to the Trustee, for delivery to the Holder, a certificate or certificates for the number
of full shares of Diamond Offshore Common Stock issuable upon exchange, together with payment in lieu of any fraction of a share,
if any, as provided in ‎Section 4.3 of this Third Supplemental
Indenture.

 

In the case
of any Note which is exchanged in part only, upon such exchange the Company shall execute and the Trustee shall authenticate and
deliver to the Holder thereof, at the expense of the Company, a new Note or Notes of authorized denominations in an aggregate
principal amount equal to the unexchanged portion of the principal amount of such Note.

 

4.3.     
Fractions of Shares.

 

No fractional shares of Diamond Offshore Common Stock shall be delivered upon exchange of any
Note or Notes. If more than one Note shall be surrendered for exchange at one time by the same Holder, the number of full shares
which shall be issuable upon exchange thereof shall be computed on the basis of the aggregate principal amount of the Notes (or
specified portions thereof) so surrendered. Instead of any fractional share of Diamond Offshore Common Stock which would otherwise
be issuable upon exchange of any Note or Notes (or specified portions thereof), the Company shall calculate and pay a cash adjustment
in respect of such fraction (calculated to the nearest 1/100th of a share) in an amount equal to the same fraction of the Closing
Price at the close of business on the day of exchange (or, if such day is not a Trading Day, on the Trading Day immediately preceding
such day), or at the Company’s option, the Company shall round up to the next higher whole share.

 

4.4.     
Adjustment of Exchange Rate.

 

The Exchange Rate shall be subject to adjustments from time to time as follows:

 

    14

     

    

(1)            
In case Diamond Offshore shall pay or make a dividend or other distribution on Diamond Offshore Common Stock exclusively
in Diamond Offshore Common Stock or shall pay or make a dividend or other distribution on any other class of capital stock of
Diamond Offshore which dividend or distribution includes Diamond Offshore Common Stock, the Exchange Rate in effect at the opening
of business on the day next following the Determination Date of such dividend or other distribution shall be increased by dividing
such Exchange Rate by a fraction of which the numerator shall be the number of shares of Diamond Offshore Common Stock outstanding
at the close of business on such Determination Date and the denominator shall be the sum of such number of shares and the total
number of shares constituting such dividend or other distribution, such increase to become effective immediately after the opening
of business on the day next following such Determination Date. For the purposes of this paragraph ‎(a), the number
of shares of Diamond Offshore Common Stock at any time outstanding shall not include shares held in the treasury of Diamond Offshore
but shall include shares issuable in respect of scrip certificates issued in lieu of fractions of shares of Diamond Offshore Common
Stock.

 

(2)            
Subject to the last sentence of paragraph ‎(8) of this Section, in case Diamond Offshore shall pay or make a
dividend or other distribution on Diamond Offshore Common Stock consisting exclusively of, or shall otherwise issue to all holders
of Diamond Offshore Common Stock, rights, warrants or options entitling the holders thereof to subscribe for or purchase shares
of Diamond Offshore Common Stock at a price per share less than the current market price per share (determined as provided in
paragraph ‎(7) of this ‎Section 4.4) of the Diamond Offshore Common Stock on the Determination Date, the
Exchange Rate in effect at the opening of business on the day following such Determination Date shall be increased by dividing
such Exchange Rate by a fraction of which the numerator shall be the number of shares of Diamond Offshore Common Stock outstanding
at the close of business on such Determination Date plus the number of shares of Diamond Offshore Common Stock which the aggregate
of the offering price of the total number of shares of Diamond Offshore Common Stock so offered for subscription or purchase would
purchase at such current market price and the denominator shall be the number of shares of Diamond Offshore Common Stock outstanding
at the close of business on such Determination Date plus the number of shares of Diamond Offshore Common Stock so offered for
subscription or purchase, such increase to become effective immediately after the opening of business on the day following such
Determination Date. For the purposes of this paragraph ‎(2), the number of shares of Diamond Offshore Common Stock
at any time outstanding shall not include shares held in the treasury of Diamond Offshore but shall include shares issuable in
respect of scrip certificates issued in lieu of fractions of shares of Diamond Offshore Common Stock.

 

(3)            
In case outstanding shares of Diamond Offshore Common Stock shall be subdivided into a greater number of shares of Diamond
Offshore Common Stock, the Exchange Rate in effect at the opening of business on the day following the day upon which such subdivision
becomes effective shall be proportionately increased, and, conversely, in case outstanding shares of Diamond Offshore Common Stock
shall each be combined into a smaller number of shares of Diamond Offshore Common Stock, the

 

    15

     

    

Exchange
Rate in effect at the opening of business on the day following the day upon which such combination becomes effective shall be
proportionately reduced, such increase or reduction, as the case may be, to become effective immediately after the opening of
business on the day following the day upon which such subdivision or combination becomes effective.

 

(4)            
Subject to the last sentence of this paragraph ‎(8) and to the last sentence of paragraph ‎(8) of
this ‎Section 4.4, in case Diamond Offshore shall, by dividend or otherwise, distribute to all holders of Diamond
Offshore Common Stock evidences of its indebtedness, shares of any class of capital stock, securities, cash or property (excluding
any rights, warrants or options referred to in paragraph ‎(2) of this ‎Section 4.4, any dividend or distribution
paid exclusively in cash and any dividend or distribution referred to in paragraph ‎(1) of this ‎Section
4.4), the Exchange Rate shall be increased so that the same shall equal the rate determined by dividing the Exchange Rate in
effect immediately prior to the close of business on the Determination Date for such distribution contemplated by this paragraph
‎(4) by a fraction of which the numerator shall be the current market price per share (determined as provided in paragraph
‎(7) of this ‎Section 4.4) of the Diamond Offshore Common Stock on the date of such Determination Date
less the fair market value (as determined in good faith by the Board of Directors, whose determination shall be conclusive and
described in a Board Resolution and shall, in the case of securities being distributed for which prior thereto there is an actual
or when-issued trading market, be no less than the value determined by reference to the average of the closing prices in such
market used in computing the current market price per share pursuant to ‎Section 4.4(7)), on such Determination Date,
of the portion of the evidences of indebtedness, shares of capital stock, securities, cash and property so distributed applicable
to one share of Diamond Offshore Common Stock and the denominator shall be such current market price per share of the Diamond
Offshore Common Stock, such increase to become effective immediately prior to the opening of business on the day next following
the date fixed for the payment of such distribution (the “Reference Date”). For purposes of this paragraph
‎(4), any dividend or distribution that includes, but does not consist exclusively of, shares of Diamond Offshore Common
Stock or rights, warrants or options to subscribe for or purchase shares of Diamond Offshore Common Stock shall be deemed to be
(a) a dividend or distribution of the evidences of indebtedness, cash, property, shares of capital stock or securities other than
such shares of Diamond Offshore Common Stock or such rights, warrants or options (making any Exchange Rate increase required by
this paragraph ‎(4)) immediately followed by (b) a dividend or distribution of such shares of Diamond Offshore Common
Stock or such rights, warrants or options (making any further Exchange Rate increase required by paragraph ‎(1) or
‎(2) of this ‎Section 4.4, except (i) the Reference Date of such dividend or distribution as defined in
this paragraph ‎(4) shall be substituted as “the date fixed for the determination of stockholders entitled to
receive such dividend or other distribution”, “the date fixed for the determination of stockholders entitled to receive
such rights, warrants or options” and “the date fixed for such determination” within the meaning of paragraphs
‎(1) and ‎(2) of this ‎Section 4.4 and (ii) any shares of Diamond Offshore Common Stock included
in such dividend or distribution shall not be deemed “outstanding at the close of business on the date fixed for such determination”
within the meaning of paragraph ‎(1) of this ‎Section 4.4).

 

    16

     

    

(5)            
In case Diamond Offshore shall, by dividend or otherwise, make a Cash Distribution in an aggregate amount that, combined
together with (i) the aggregate amount of any other Cash Distributions made within the 12 months preceding the date of payment
of such distribution in respect of which no adjustment pursuant to this paragraph ‎(5) has been made and (ii) any Excess
Purchase Payment made within the 12 months preceding the date of such distribution and in respect of which no adjustment has been
made pursuant to paragraph ‎(6) of this ‎Section 4.4, exceeds 12.5% of Diamond Offshore’s Common
Stock Market Capitalization on the Determination Date for such Cash Distribution, then, and in each such case, immediately after
the close of business on the Determination Date for such Cash Distribution, the Exchange Rate shall be adjusted so that the same
shall equal the rate determined by dividing the Exchange Rate in effect immediately prior to the close of business on such Determination
Date by a fraction (a) the numerator of which shall be equal to the current market price per share (determined as provided in
paragraph ‎(7) of this Section) of the Diamond Offshore Common Stock on such Determination Date less an amount equal
to the quotient of (1) the amount of such excess (over 12.5% of Diamond Offshore’s Common Stock Market Capitalization as
described above) divided by (2) the number of shares of Diamond Offshore Common Stock outstanding on such Determination Date and
(b) the denominator of which shall be equal to the current market price per share (determined as provided in paragraph ‎(7)
of this ‎Section 4.4) of the Diamond Offshore Common Stock on such Determination Date.

 

(6)            
In case Diamond Offshore or any subsidiary of Diamond Offshore shall make an Excess Purchase Payment in an aggregate amount
that, combined together with (i) the aggregate amount of any other Excess Purchase Payments made by Diamond Offshore or any subsidiary
of Diamond Offshore within the 12 months preceding such Excess Purchase Payment in respect of which no adjustment pursuant to
this paragraph ‎(6) has been made and (ii) the aggregate amount of any Cash Distributions made within the 12 months
preceding such Excess Purchase Payment in respect of which no adjustment pursuant to paragraph ‎(5) of this ‎Section
4.4 has been made, exceeds 12.5% of Diamond Offshore’s Market Capitalization as of the Determination Date, then, and in
each such case, immediately prior to the opening of business on the day after the tender offer in respect of which such Excess
Purchase Payment is to be made expires, the Exchange Rate shall be adjusted so that the same shall equal the rate determined by
dividing the Exchange Rate in effect immediately prior to the close of business on the Determination Date for such tender offer
by a fraction (a) the numerator of which shall be equal to (A) the product of (I) the number of shares of Diamond Offshore Common
Stock outstanding (including any tendered shares) at such Determination Date multiplied by (II) the current market price per share
(determined as provided in paragraph ‎(7) of this Section) of the Diamond Offshore Common Stock less (B) the amount
of such excess (over 12.5% of Diamond Offshore’s Common Stock Market Capitalization as described above) and (b) the denominator
of which shall be equal to the product of (X) the current market price per share of the Diamond Offshore Common Stock (determined
as provided in paragraph ‎(7) of this ‎Section 4.4) as of such Determination Date multiplied by (Y) the
number of shares of Diamond Offshore Common Stock outstanding (including any tendered shares) as of the Determination Date less
the number of all shares validly tendered and not withdrawn as of the Determination Date.

 

    17

     

    

(7)            
For the purpose of any computation under this paragraph and paragraphs ‎(2), ‎(4) and ‎(5)
of this ‎Section 4.4, the current market price per share of Diamond Offshore Common Stock on any date in question
shall be deemed to be the average of the daily Closing Prices for the 5 consecutive Trading Days selected by the Company commencing
not more than 20 Trading Days before, and ending not later than, the date in question; provided, however, that (i) if the “ex”
date (as hereinafter defined) for any event (other than the issuance or distribution requiring such computation) that requires
an adjustment to the Exchange Rate pursuant to paragraph ‎(1), ‎(2), ‎(3), ‎(4), ‎(5)
or ‎(6) above (“Other Event”) occurs on or after the 20th Trading Day prior to the date in question
and prior to the “ex” date for the issuance or distribution requiring such computation (the “Current Event”),
the Closing Price for each Trading Day prior to the “ex” date for such Other Event shall be adjusted by dividing such
Closing Price by the same fraction by which the Exchange Rate is so required to be adjusted as a result of such Other Event, (ii)
if the “ex” date for any Other Event occurs after the “ex” date for the Current Event and on or prior
to the date in question, the Closing Price for each Trading Day on and after the “ex” date for such Other Event shall
be adjusted by dividing such Closing Price by the reciprocal of the fraction by which the Exchange Rate is so required to be adjusted
as a result of such Other Event, (iii) if the “ex” date for any Other Event occurs on the “ex” date for
the Current Event, one of those events shall be deemed for purposes of clauses ‎(i) and ‎(ii) of this proviso
to have an “ex” date occurring prior to the “ex” date for the other event, and (iv) if the “ex”
date for the Current Event is on or prior to the date in question, after taking into account any adjustment required pursuant
to clause ‎(ii) of this proviso, the Closing Price for each Trading Day on or after such “ex” date shall
be adjusted by adding thereto the amount of any cash and the fair market value on the date in question (as determined in good
faith by the Board of Directors in a manner consistent with any determination of such value for purposes of paragraph ‎(4)
or ‎(5) of this ‎Section 4.4, whose determination shall be conclusive and described in a Board Resolution)
of the portion of the rights, warrants, options, evidences of indebtedness, shares of capital stock, securities, cash or property
being distributed applicable to one share of Diamond Offshore Common Stock. For the purpose of any computation under paragraph
‎(6) of this ‎Section 4.4, the current market price per share of Diamond Offshore Common Stock on any date
in question shall be deemed to be the average of the daily Closing Prices for the 5 consecutive Trading Days selected by the Company
commencing on or after the latest (the “Commencement Date”) of (i) the date 20 Trading Days before the date
in question, (ii) the date of commencement of the tender or exchange offer requiring such computation and (iii) the date of the last
amendment, if any, of such tender or exchange offer involving a change in the maximum number of shares for which tenders are sought
or a change in the consideration offered, and ending not later than the date of the Expiration Time of such tender or exchange
offer (or, if such Expiration Time occurs before the close of trading on a Trading Day, not later than the Trading Day immediately
preceding the date of such Expiration Time); provided, however, that if the “ex” date for any Other Event (other than
the tender or exchange offer requiring such computation) occurs on or after the Commencement Date and on or prior to the date
of the Expiration Time for the tender or exchange offer requiring such computation, the Closing Price for each Trading Day prior
to the “ex” date for such Other Event shall be adjusted by dividing such Closing Price by the same

 

    18

     

    

fraction
by which the Exchange Rate is so required to be adjusted as a result of such Other Event. For purposes of this paragraph, the
term “ex” date, (i) when used with respect to any issuance or distribution, means the first date on which the Diamond
Offshore Common Stock trades regular way on the relevant exchange or in the relevant market from which the Closing Price was obtained
without the right to receive such issuance or distribution, (ii) when used with respect to any subdivision or combination of shares
of Diamond Offshore Common Stock, means the first date on which the Diamond Offshore Common Stock trades regular way on such exchange
or in such market after the time at which such subdivision or combination becomes effective, and (iii) when used with respect to
any tender or exchange offer means the first date on which the Diamond Offshore Common Stock trades regular way on such exchange
or in such market after the Expiration Time of such tender or exchange offer.

 

(8)            
The reclassification of Diamond Offshore Common Stock into securities other than Diamond Offshore Common Stock (other than
any reclassification upon a consolidation or merger to which ‎Section 4.11 of the Supplemental Indenture applies) shall
be deemed to involve (a) a distribution of such securities other than Diamond Offshore Common Stock to all holders of Diamond
Offshore Common Stock (and the effective date of such reclassification shall be deemed to be the Determination Date), and (b)
a subdivision or combination, as the case may be, of the number of shares of Diamond Offshore Common Stock outstanding immediately
prior to such reclassification into the number of shares of Diamond Offshore Common Stock outstanding immediately thereafter (and
the effective date of such reclassification shall be deemed to be “the day upon which such subdivision becomes effective”
or “the day upon which such combination becomes effective”, as the case may be, and “the day upon which such
subdivision or combination becomes effective” within the meaning of paragraph ‎(3) of this ‎Section
4.4). Rights or warrants issued by Diamond Offshore to all holders of Diamond Offshore Common Stock entitling the holders thereof
to subscribe for or purchase shares of Diamond Offshore Common Stock, which rights or warrants (i) are deemed to be transferred
with such shares of Diamond Offshore Common Stock, (ii) are not exercisable and (iii) are also issued in respect of future issuances
of Diamond Offshore Common Stock, in each case in clauses ‎(i) through ‎(iii) until the occurrence of a specified
event or events (“Trigger Event”), shall for purposes of this ‎Section 4.04 not be deemed issued
until the occurrence of the earliest Trigger Event.

 

(9)            
Diamond Offshore may make such increases in the Exchange Rate, in addition to those required by paragraphs ‎(1),
‎(2), ‎(3), ‎(4), ‎(5) and ‎(6) of this Section, as it considers to be
advisable in order that any event treated for Federal income tax purposes as a dividend of stock or stock rights shall not be
taxable to the recipients.

 

(10)            
No adjustment in the Exchange Rate shall be required unless such adjustment would require an increase or decrease of at
least 1% in the Exchange Rate; provided, however, that any adjustments which by reason of this paragraph ‎(10) are not
required to be made shall be carried forward and taken into account in any subsequent adjustment.

 

    19

     

    

4.5.     
Notice of Adjustments of Exchange Rate.

 

Whenever the Exchange Rate is adjusted as provided in ‎Section 4.4
of this Third Supplemental Indenture:

 

(1)            
the Company shall compute the adjusted Exchange Rate in accordance with ‎Section 4.4 and shall prepare a certificate
signed by either the chief financial officer, the treasurer or the controller of the Company setting forth the adjusted Exchange
Rate and showing in reasonable detail the facts upon which such adjustment is based, and such certificate shall promptly be filed
with the Trustee and at each office or agency maintained for the purpose of exchange of Notes pursuant to ‎Section
4.7 of this Third Supplemental Indenture; and

 

(2)            
a notice stating that the Exchange Rate has been adjusted and setting forth the adjusted Exchange Rate shall forthwith
be prepared, and as soon as practicable after it is prepared, such notice shall be provided by the Company to the Trustee and
to all Holders. Unless and until the Trustee receives such notice, it need not inquire into whether any adjustment of the Exchange
Rate is required and may assume that no such adjustment has been, or is required to be, made.

 

4.6.     
Notice of Certain Corporate Action.

 

In case:

 

(a)            
Diamond Offshore shall declare a dividend (or any other distribution) on Diamond Offshore Common Stock payable (i) otherwise
than exclusively in cash or (ii) exclusively in cash in an amount that would require any adjustment pursuant to ‎Section
4.4 of this Third Supplemental Indenture; or

 

(b)            
Diamond Offshore shall authorize the granting to the holders of Diamond Offshore Common Stock of rights, options or warrants
to subscribe for or purchase any shares of capital stock of any class or of any other rights; or

 

(c)            
of any reclassification of Diamond Offshore Common Stock, or of any consolidation, merger or share exchange to which Diamond
Offshore is a party and for which approval of any shareholders of Diamond Offshore is required, or of the conveyance, sale, transfer
or lease of all or substantially all of the assets of Diamond Offshore; or

 

(d)            
of the voluntary or involuntary dissolution, liquidation or winding up of Diamond Offshore; or

 

(e)            
Diamond Offshore or any subsidiary of Diamond Offshore shall commence a tender offer for all or a portion of the outstanding
shares of Diamond Offshore Common Stock (or shall amend any such tender offer);

 

then the Company shall cause
to be filed with the Trustee and at each office or agency maintained for the purpose of conversion of Notes pursuant to ‎Section
4.7 of this Third Supplemental Indenture, and shall cause to be provided to all Holders, by the later of (i) as soon as reasonably
practicable after the Company has become aware of such matter or (ii) at least 20 days (or 10 days in any case specified in clause
‎(a) or ‎(b)
above) prior to the applicable record, expiration or effective date hereinafter specified, a notice stating (x)

 

    20

     

    

the date on which a record is
to be taken for the purpose of such dividend, distribution, rights, options or warrants, or, if a record is not to be taken, the
date as of which the holders of Diamond Offshore Common Stock of record to be entitled to such dividend, distribution, rights,
options or warrants are to be determined, (y) the date on which the right to make tenders under such tender offer expires or (z)
the date on which such reclassification, consolidation, merger, conveyance, transfer, sale, lease, dissolution, liquidation or
winding up is expected to become effective, and the date as of which it is expected that holders of Diamond Offshore Common Stock
of record shall be entitled to exchange their shares of Diamond Offshore Common Stock for securities, cash or other property deliverable
upon such reclassification, consolidation, merger, conveyance, transfer, sale, lease, dissolution, liquidation or winding up.
Neither the failure to give such notice or the notice referred to in the following paragraph nor any defect therein shall affect
the legality or validity of the proceedings described in clauses ‎(a)
through ‎(e) of this ‎Section
4.6.

 

The preceding
paragraph to the contrary notwithstanding, the Company shall cause to be filed at each office or agency maintained for the purpose
of exchange of Notes pursuant to ‎Section 4.7 of this Third
Supplemental Indenture, and shall cause to be provided to all Holders, notice of any tender offer by Diamond Offshore or any subsidiary
of Diamond Offshore for all or any portion of the Diamond Offshore Common Stock at or about the time that such notice of tender
offer is provided to the public generally.

 

Section 4.7.     
Maintenance of Office or Agency.

 

The Company will maintain in the Borough of Manhattan, The City of New York an
office or agency where Notes may be surrendered for exchange and where notices and demands to or upon the Company in respect of
the Notes and the Indenture may be served. The Company will give prompt written notice to the Trustee of the location, and any
change in the location, of such office or agency. If at any time the Company shall fail to maintain any such required office or
agency or shall fail to furnish the Trustee with the address thereof, such surrenders may be made or served at the Corporate Trust
Office of the Trustee, and the Company hereby appoints the Trustee as its agent to receive all such surrenders.

 

The Company
may also from time to time designate one or more other offices or agencies (in or outside the Borough of Manhattan, The City of
New York) where the Notes may be presented or surrendered for such purpose and may from time to time rescind such designations;
provided, however, that no such designation or rescission shall in any manner relieve the Company of its obligation to maintain
an office or agency in the Borough of Manhattan, The City of New York for such purpose. The Company will give prompt written notice
to the Trustee of any such designation or rescission and of any change in the location of any such other office or agency.

 

Section 4.8.     
Taxes on Exchanges.

 

Except as provided in the next sentence, the Company will pay any and all taxes and duties that
may be payable in respect of the delivery of shares of Diamond Offshore Common Stock pursuant hereto. The Company shall not, however,
be required to pay any tax or duty which may be payable in respect of any transfer involved in the delivery of shares of Diamond
Offshore Common Stock in a

 

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name
other than that of the Holder of the Note or Notes to be exchanged, and no such issue or delivery shall be made unless and until
the Person requesting such issue has paid to the Company the amount of any such tax or duty, or has established to the satisfaction
of the Company that such tax or duty has been paid.

 

Section 4.9.     
Covenant as to Diamond Offshore Common Stock.

 

The Company agrees that all shares of Diamond Offshore Common Stock
which are delivered upon exchange of Notes, upon such delivery, will have been duly authorized and validly issued and will be
fully paid and nonassessable and, except as provided in ‎Section 4.8 of this Third Supplemental Indenture, the Company will
pay all taxes, liens and charges with respect to the issue thereof.

 

Section 4.10.     
Cancellation of Exchanged Notes.

 

All Notes delivered for exchange shall be delivered to the Trustee to be canceled
by or at the direction of the Trustee, which shall dispose of the same as provided in Section 309 of the Indenture.

 

Section 4.11.     
Provision in Case of Consolidation, Merger or Sale of Assets of Diamond Offshore.

 

In case of any consolidation of
Diamond Offshore with any other Person, any merger of Diamond Offshore into another Person or of another Person into Diamond Offshore
(other than a merger which does not result in any reclassification, exchange, or cancellation of outstanding shares of Diamond
Offshore Common Stock) or any conveyance, sale, transfer or lease of all or substantially all of the properties and assets of
Diamond Offshore, the Company shall execute and deliver to the Trustee a supplemental indenture providing that the Holder of each
Note then Outstanding shall have the right thereafter, during the period such Note shall be exchangeable, to exchange such Note
only into the kind and amount of Notes, cash and other property receivable upon such consolidation, merger, conveyance, sale,
transfer or lease (including any Diamond Offshore Common Stock retainable) by a holder of the number of shares of Diamond Offshore
Common Stock of the Company into which such Note might have been exchanged immediately prior to such consolidation, merger, conveyance,
sale, transfer or lease, (a) assuming such holder of Diamond Offshore Common Stock (i) is not a Person with which Diamond Offshore
consolidated, into which Diamond Offshore merged or which merged into Diamond Offshore or to which such conveyance, sale, transfer
or lease was made, as the case may be (a “Constituent Person”), or an Affiliate of a Constituent Person and
(ii) failed to exercise his rights of election, if any, as to the kind or amount of securities, cash and other property receivable
upon such consolidation, merger, conveyance, sale, transfer or lease (provided that if the kind or amount of securities, cash
and other property receivable upon such consolidation, merger, conveyance, sale, transfer, or lease is not the same for each share
of Diamond Offshore Common Stock held immediately prior to such consolidation, merger, conveyance, sale, transfer or lease by
others than a Constituent Person or an Affiliate thereof and in respect of which such rights of election shall not have been exercised
(“Non-electing Share”), then for the purpose of this ‎Section 4.11 the kind and amount of securities, cash
and other property receivable upon such consolidation, merger, conveyance, sale, transfer or lease by the holders of each Non-electing
Share shall be deemed to be the kind and amount so receivable per share by a plurality of the Non-electing Shares), and (b) further
assuming that, if such consolidation, merger, conveyance, transfer, sale or lease occurs before the

 

    22

     

    

first
date on which Notes may be exchanged as provided herein, such Note was exchangeable immediately prior to the time of such
occurrence at the initial Exchange Rate as adjusted from the original issue date of the Notes to such time as provided
herein. Such supplemental indenture shall provide for adjustments which, for events subsequent to the effective date of such
supplemental indenture, shall be as nearly equivalent as may be practicable to the adjustments provided for in this
‎Section 4. The above provisions of this ‎Section 4.11 shall similarly apply to successive consolidations, mergers,
conveyances, sales, transfers or leases. Notice of the execution of such a supplemental indenture shall be given by the
Company to the Holder of each Note promptly upon such execution. In this paragraph, “securities of the kind
receivable” upon such consolidation, merger, conveyance, transfer, sale or lease by a holder of Diamond Offshore Common
Stock means securities that, among other things, are registered and transferable under the Securities Act, and listed and
approved for quotation in all securities markets, in each case to the same extent as such securities so receivable by a
holder of Diamond Offshore Common Stock.

 

Neither the
Trustee nor any Paying Agent shall be under any responsibility to determine the correctness of any provisions contained in any
such supplemental indenture relating either to the kind or amount of shares of stock or other securities or property or cash receivable
by Holders upon the exchange of their Notes after any such consolidation, merger, conveyance, transfer, sale or lease or to any
such adjustment, but may accept as conclusive evidence of the correctness of any such provisions, and shall be protected in relying
upon, an Opinion of Counsel with respect thereto, which the Company shall cause to be furnished to the Trustee upon request.

 

Section 4.12.     
Responsibility of Trustee for Exchange Provisions.

 

The Trustee, subject to the provisions of Section 601 of the
Indenture, shall not at any time be under any duty or responsibility to any Holder to determine whether any facts exist which
may require any adjustment of the Exchange Rate, or with respect to the nature or extent of any such adjustment when made, or
with respect to the method employed, or herein or in any supplemental indenture provided to be employed, in making the same, or
whether a supplemental indenture need be entered into. The Trustee, in such capacity and subject to the provisions of Section
601 of the Indenture, shall not be accountable with respect to the validity or value (or the kind or amount) of any Diamond Offshore
Common Stock, or of any other securities or property or cash, which may at any time be issued or delivered upon the exchange of
any Note; and it or they do not make any representation with respect thereto. The Trustee, in such capacity and subject to the
provisions of Section 601 of the Indenture, shall not be responsible for any failure of the Company to make or calculate any cash
payment or to issue, transfer or deliver any shares of Diamond Offshore Common Stock or share certificates or other securities
or property or cash upon the surrender of any Note for the purpose of conversion; and the Trustee, subject to the provisions of
Section 601 of the Indenture, shall not be responsible for any failure of the Company to comply with any of the covenants of the
Company contained in this Section.

 

Section 4.13.     
Registration.

 

The Company will use its best efforts to effect or cause to be effected all registrations with, and
obtain all approvals by, all governmental authorities that may be necessary under any United States Federal or state law (including

 

    23

     

    

the
Securities Act, the Exchange Act and state securities and Blue Sky laws) for the shares of Diamond Offshore Common Stock issuable
upon conversion of Notes to be lawfully issued and delivered as provided herein, and thereafter freely transferrable.

 

5.
Miscellaneous

 

(a)            
The Trustee accepts the trusts created by the Indenture, as supplemented by this Third Supplemental Indenture, and agrees
to perform the same upon the terms and conditions of the Indenture, as supplemented by this Third Supplemental Indenture.

 

(b)            
The recitals contained herein shall be taken as statements of the Company, and the Trustee assumes no responsibility for
their correctness. The Trustee makes no representations as to the validity or sufficiency of this Third Supplemental Indenture.

 

(c)            
All covenants and agreements in this Third Supplemental Indenture by the Company or the Trustee shall bind its respective
successors and assigns, whether so expressed or not.

 

(d)            
In case any provisions in this Third Supplemental Indenture shall be invalid, illegal or unenforceable, the validity, legality
and enforceability of the remaining provisions shall not in any way be affected or impaired thereby.

 

(e)            
Nothing in this Third Supplemental Indenture, express or implied, shall give to any Person, other than the parties hereto
and their successors under the Indenture and the Holders of the Notes, any benefit or any legal or equitable right, remedy or
claim under the Indenture.

 

(f)            
If any provision hereof limits, qualifies or conflicts with a provision of the Trust Indenture Act of 1939, as may be amended
from time to time, that is required under such Act to be a part of and govern this Third Supplemental Indenture, the latter provision
shall control. If any provision hereof modifies or excludes any provision of such Act that may be so modified or excluded, the
latter provision shall be deemed to apply to this Third Supplemental Indenture as so modified or excluded, as the case may be.

 

(g)            
This Third Supplemental Indenture shall be governed by and construed in accordance with the laws of the State of New York.

 

(h)            
All provisions of this Third Supplemental Indenture shall be deemed to be incorporated in, and made a part of, the Indenture;
and the Indenture, as supplemented by this Third Supplemental Indenture, shall be read, taken and construed as one and the same
instrument. The provisions of this Third Supplemental Indenture shall, subject to Section ‎5(f) hereof, supercede the
provisions of the Indenture to the extent the Indenture is inconsistent herewith.

 

    24

     

    

This instrument
may be executed in any number of counterparts, each of which so executed shall be deemed to be an original, but all such counterparts
shall together constitute but one and the same instrument.

 

[Remainder
of page intentionally left blank]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

    25

     

    

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

 

	 	LOEWS CORPORATION
	 	 
	 	 
	 	By:	/s/ Peter W. Keegan
	 	 	Its:Vice President

 

[SEAL]

 

	 	THE CHASE MANHATTAN BANK
	 	 
	 	 
	 	By:	/s/ Ronald J. Halleran
	 	 	Its:Second Vice President

 

[SEAL]

 

 

 

 

[Signature Page to Third Supplemental
Indenture]

 

     

     

    

 

	State of NEW YORK	)
	 	)  ss.:
	couNty of NEW YORK	)

  

On the 18th
day of September, 1997, before me personally came Ronald J. Halleran to me known, who, being by me duly sworn, did depose and
say that he resides at New York, New York; that he is a Second Vice President of THE CHASE MANHATTAN BANK, one of the banking
corporations described herein and that executed the above instrument; that he knows the seal of said corporation; that the seal
affixed to said instrument is such corporate seal; that it was so affixed by the Board of Directors of said corporation and that
he signed his name thereto by order of the Board of Directors of said corporation.

 

IN WITNESS
WHEREOF, I have hereunto set my hand and affixed my official seal the day and year of this certificate first above written.

 

	[NOTARIAL SEAL]	By:	/s/ Kin Yu Lee
	 	 	Notary Public

 

 

Kin Yu Lee

Notary Public, State of New York

No. 01LE6031199

Qualified in New York County

Commission Expires Aug. 1, 1998

 

 

 

 

 

 

 

 

 

 

     

     

    

	State of NEW YORK	)
	 	)  ss.:
	couNty of NEW YORK	)

 

On the 18th
day of September, 1997, before me personally came Peter Keegan to me known, who, being by me duly sworn, did depose and say that
he resides at New York, New York; that he is a Vice President of LOEWS CORPORATION, the corporations described herein and that
executed the above instrument; that he knows the seal of said corporation; that the seal affixed to said instrument is such corporate
seal; that it was so affixed by the Board of Directors of said corporation and that he signed his name thereto by order of the
Board of Directors of said corporation.

 

IN WITNESS
WHEREOF, I have hereunto set my hand and affixed my official seal the day and year of this certificate first above written.

 

	[NOTARIAL SEAL]	By:	/s/ Debra D. Karam
	 	 	Notary Public

 

 

Debra D. Karam

Notary Public, State of New York

No. 4886691

Qualified in Nassau County

Commission Expires May 18, 1998

 

    28

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