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AMENDMENT NO. 5
  RECITALS
    ARTICLE I.
DEFINITIONS
 Section 1.01 Terms Defined Above
 Section 1.02 Terms Defined in the Credit Agreement
 Section 1.03 Other Definitional Provisions .




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ARTICLE II.
AMENDMENT TO CREDIT AGREEMENT
 Section 2.01 Increase in Commitments.
 Section 2.02 Increase in Borrowing Base.
 ARTICLE III.
REPRESENTATIONS AND WARRANTIES
 Section 3.01 Borrower Representations and Warranties
 Section 3.02 Guarantors Representations and Warranties
 -2-




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ARTICLE IV.
CONDITIONS
  Section 4.01 Documents; Certificates
      Section 4.02 No Default
 Section 4.03 Representations
 ARTICLE V.
MISCELLANEOUS
 Section 5.01 Effect on Loan Documents; Acknowledgments
  -3-




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Section 5.02 Reaffirmation of the Guaranty
 Section 5.03 Counterparts
 Section 5.04 Successors and Assigns
 Section 5.05 Invalidity
 -4-




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Section 5.06 Governing Law .
 Section 5.07 Entire Agreement THIS AGREEMENT, THE CREDIT AGREEMENT AS AMENDED BY THIS
AGREEMENT, THE NOTES, AND THE OTHER LOAN DOCUMENTS CONSTITUTE THE ENTIRE UNDERSTANDING AMONG THE
PARTIES HERETO WITH RESPECT TO THE SUBJECT MATTER HEREOF AND SUPERSEDE ANY PRIOR AGREEMENTS,
WRITTEN OR ORAL, WITH RESPECT THERETO.
 THERE ARE NO UNWRITTEN ORAL AGREEMENTS AMONG THE PARTIES.
  -5-




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MARINER ENERGY, INC.By:
    /s/ Rick G. LesterRick G. LesterVice President and Chief Financial OfficerMARINER LP LLCBy:
    /s/ Rick G.LesterRick G. LesterVice President and Chief Financial Officer MARINER ENERGY TEXAS LP, a Delaware limited partnershipBy:
    
    Mariner Energy, Inc., its sole general partnerBy:
    
    /s/ Rick G. LesterRick G. LesterVice President and Chief FinancialOfficer
 UNION BANK OF CALIFORNIA, N.A.,
as Administrative Agent, as Issuing Lender, and as a
LenderBy:
    /s/ Damien MeiburgerDamien Meiburger, Senior Vice PresidentBy:
    /s/ Ali AhmedAli Ahmed, Vice President




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BNP PARIBAS, as Joint Lead Arranger, as SyndicationAgent and as a LenderBy:

    /s/ Douglas R. LiftmanName:
    
    Douglas R. LiftmanTitle:
    
    Managing DirectorBy:

    /s/ Polly SchottName:
    
    Polly SchottTitle:
    
    Vice President




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JPMORGAN CHASE BANK, N.A.By:

    /s/ Charles Kingswell-SmithName:
    
    Charles Kingswell-SmithTitle:
    
    Vice President




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AMEGY BANK NATIONAL ASSOCIATIONBy:
    
    /s/ Kenneth R. Batson, IIIName:
    
    Kenneth R. Batson, IIITitle:
    
    Vice President, Energy Lending




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GUARANTY BANKBy:

    /s/ Kelly L. Elmore IIIName:
    
    Kelly L. Elmore IIITitle:
    
    Senior Vice President




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HARRIS NESBITT FINANCING, INC.By:
    
    /s/ James V. DucoteName:
    
    James V. DucoteTitle:
    
    Vice President




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SCHEDULE II  BORROWER, ADMINISTRATIVE AGENT, AND LENDER INFORMATION
  Borrower:
    
    Office:Mariner Energy, Inc.
    
    Address for Notices:2101 CityWest Blvd.,Building 4, Suite 900Houston, Texas 77042Telecopier Number: 713-954-5555Attention: Rick Lester
 Administrative Agent:
    
    Applicable Lending Offices:Union Bank of California, N.A.
    
    Address for Notices:4200 Lincoln Plaza500 N. AkardDallas, Texas 75201Telecopier Number: 213-236-6823Attention: Don Smith
 Lenders:
    
    Applicable Lending Offices:Union Bank of California, N.A.
    
    U.S. Domestic Lending Office:445 South Figueroa Street, 15th FloorTranche A Commitment: [$41,666,667]
    
    Los Angeles, California 90071Tranche B Commitment: $0
    
    Eurodollar Lending Office:445 South Figueroa Street, 15th FloorLos Angeles, California 90071Address for Notices:445 South Figueroa Street, 15th FloorLos Angeles, California 90071Telecopier Number: 213-236-6823
Attention: Don Smith




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Lenders:
    
    Applicable Lending Offices:BNP Paribas
    
    U.S. Domestic Lending Office:919 Third AvenueTranche A Commitment: [$41,666,667]
    
    New York, NY 10022Tranche B Commitment: $0
    
    Eurodollar Lending Office:919 Third AvenueNew York, NY 10022Address for Notices:919 Third AvenueNew York, NY 10022Telecopier Number: 212-841-2682Attention: Cory LantinJPMorgan Chase Bank, N.A.
    
    U.S. Domestic Lending Office:1 Bank One PlazaTranche A Commitment: [$33,333,333]
    
    IL1-0634Chicago, IL 60670Tranche B Commitment: $0
    
    Eurodollar Lending Office:1 Bank One Plaza
IL1-0634Chicago, IL 60670Address for Notices:1 Bank One PlazaIL1-0634Chicago, IL 60670Telecopier Number: 312-385-7097Attention: Tess Siao




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Lenders:
    
    Applicable Lending Offices:Amegy Bank National Association
    
    U.S. Domestic Lending Office:4400 Post Oak Parkway #404Tranche A Commitment: [$25,000,000]
    
    Houston, Texas 77027Tranche B Commitment: $0
    
    Eurodollar Lending Office:4400 Post Oak Parkway #404Houston, Texas 77027Address for Notices:4400 Post Oak Parkway #404Houston, Texas 77027Telecopier Number: 713-693-7467Attention: Maxine HunterGuaranty Bank
    
    U.S. Domestic Lending Office:8333 Douglas AvenueTranche A Commitment: [$33,333,333]
    
    Dallas, Texas 75225Tranche B Commitment: $0
    
    Eurodollar Lending Office:8333 Douglas AvenueDallas, Texas 75225Address for Notices:8333 Douglas AvenueDallas, Texas 75225Telecopier Number: 214-360-5109Attention: Sonia JahanHarris Nesbitt Financing, Inc.
    
    U.S. Domestic Lending Office:115 S. Lasalle St.Tranche A Commitment: [$25,000,000]
    
    Chicago, Il 60603Tranche B Commitment: $0
    
    Eurodollar Lending Office:115 S. Lasalle St.Chicago, Il 60603Address for Notices:115 S. Lasalle St.Chicago, Il 60603Telecopier Number: 312-750-6061
Attention: Alicia Garcia