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                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                               -------------------


                                  SCHEDULE 13G

             INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934

                          MCDERMOTT INTERNATIONAL, INC.
                                (Name of Issuer)

                             Common Stock, Par 1.00
                         (Title of Class of Securities)

                                    580037109
                                 (CUSIP Number)

                                 August 18, 2003



Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

        [ ]  Rule 13d-1 (b)
        [X]  Rule 13d-1 (c)
        [ ]  Rule 13d-1 (d)




         *The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter the disclosures provided in a prior cover page.


         The information required in the remainder of this cover page shall not
be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).









                               (page 1 of 4 pages)





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CUSIP No. 580037109                      13G          Page 2 of 4 Pages
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        1   NAME OF REPORTING PERSONS S.S. OR
            I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

            JANA PARTNERS LLC

        2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
            (a)  |_|
            (b)  |_|

        3   SEC USE ONLY

        4   SOURCE OF FUNDS*
                  WC

        5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
            ITEMS 2(d) or 2(e) |_|

        6   CITIZENSHIP OR PLACE OF ORGANIZATION
            DELAWARE

NUMBER OF         7     SOLE VOTING POWER
SHARES
BENEFICIALLY                3,748,700
OWNED BY
EACH REPORTING    8     SHARED VOTING POWER
PERSON WITH
                            -0-

                  9     SOLE DISPOSITIVE POWER

                            3,748,700

                  10    SHARED DISPOSITIVE POWER

                            -0-

                  11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
                        PERSON

                            3,748,700

                  12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
                        CERTAIN SHARES*  |_|

                  13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                            5.71 %

                  14    TYPE OF REPORTING PERSON*

                            CO

*SEE INSTRUCTIONS BEFORE FILLING OUT!






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CUSIP No. 580037109                    13G            Page 3 of 4 Pages
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Item 1(a).      Name of Issuer:
                McDermott International, Inc.

Item 1 (b).     Address of Issuer's Principal Executive Offices:
                1450 Poydras Street
                New Orleans, LA 70112-6050

Item 2 (a).     Name of Person Filing: JANA Partners LLC

Item 2 (b).     Address of Principal Business Office or, if None, Residence:

                536 Pacific Avenue, San Francisco, California 94133.

Item 2 (c).     Citizenship:
            (i) This Statement is filed by JANA Partners LLC, a Delaware
            limited liability company. JANA Partners LLC is a private
            money management firm which holds the Common Stock of the
            Issuer in various accounts under its management and control.
            The principals of JANA Partners LLC, Barry Rosenstein and Gary
            Claar, are U.S. citizens.

Item 2 (d).     Title of Class of Securities:
                 Common Stock

Item 2 (e).     CUSIP No: 580037109

Item 3.         If this statement is filed pursuant to Sec. 240.13d-1(b)
                or 240.13d-2(b) or (c), check whether the person filing is a:
                Not applicable.

Item 4.         Ownership

      (a) Amount beneficially owned: 3,748,700

      (b) Percent of Class: 5.71 %

      (c) Number of shares as to which JANA Partners LLC has:
         (i)   Sole power to vote or to direct the vote: 3,748,700
         (ii)  Shared power to vote or to direct the vote: 0
         (iii) Sole power to dispose or to direct the disposition: 3,748,700
         (iv)  Shared power to dispose or to direct the disposition of: 0

Item 5. Ownership of Five Percent of Less of a Class.
        Not Applicable.

Item 6.  Ownership of More than Five Percent on Behalf of Another Person.
        Not Applicable.

Item 7. Identification and Classification of the Subsidiary Which Acquired
        the Security Reported on the Parent Holding Company.
        Not Applicable.

Item 8. Identification and Classification of Members of the Group.
        Not Applicable.

Item 9. Notice of Dissolution of Group.
        Not Applicable.






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CUSIP No. 580037109                    13G            Page 4 of 4 Pages
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Item 10. Certification.

By signing below, each of the reporting persons hereby certifies that, to the
best of its knowledge and belief, the securities referred to above were not
acquired and are not being held for the purpose of or with the effect of
changing or influencing the control of the issuer of such securities and were
not acquired and are not held in connection with or as a participant in any
transaction having that purpose or effect.

SIGNATURE

After reasonable inquiry and to the best of the undersigned's knowledge and
belief, the undersigned certifies that the information set forth in this
statement is true, complete, and correct.

August 25, 2003




                                          /s/Barry Rosenstein
                                          Barry Rosenstein

                                          /s/Gary Claar
                                          Gary Claar