AMENDMENT NO. 5

Exhibit 4.11

AMENDMENT NO. 5

     This Amendment No. 5 (“Agreement”) dated as of August 5, 2005 (“Effective Date”) is among Mariner Energy, Inc., a Delaware corporation (the “Borrower”), Mariner LP LLC, Mariner Energy Texas LP, and the Lenders (as defined below), and Union Bank of California, N.A., as administrative agent for such Lenders (in such capacity, the “Administrative Agent”) and as issuing lender for such Lenders (in such capacity, the “Issuing Lender”).

RECITALS

     A. The Borrower, the Lenders, Issuing Lender and the Administrative Agent are parties to the Credit Agreement dated as of March 2, 2004, as amended by that certain Amendment No. 1 and Assignment Agreement dated as of July 14, 2004, that certain Amendment No. 2 and Consent dated as of February 7, 2005, that certain Amendment No. 3 and Consent dated as of March 3, 2005, and that certain Amendment No. 4 dated as of July 14, 2005 (as so amended, the “Credit Agreement”).

     B. At the request of the Borrower, the Administrative Agent and the Lenders wish to, subject to the terms and conditions of this Agreement, amend certain provisions of the Credit Agreement as set forth herein.

     THEREFORE, the Borrower, the subsidiaries of the Borrower signatory hereto (the “Guarantors”), the Lenders, the Issuing Lender and the Administrative Agent hereby agree as follows:

ARTICLE I.
DEFINITIONS

     Section 1.01 Terms Defined Above. As used in this Agreement, each of the terms defined in the opening paragraph and the Recitals above shall have the meanings assigned to such terms therein.

     Section 1.02 Terms Defined in the Credit Agreement. Each term defined in the Credit Agreement and used herein without definition shall have the meaning assigned to such term in the Credit Agreement, unless expressly provided to the contrary.

     Section 1.03 Other Definitional Provisions. The words “hereby”, “herein”, “hereinafter”, “hereof”, “hereto” and “hereunder” when used in this Agreement shall refer to this Agreement as a whole and not to any particular Article, Section, subsection or provision of this Agreement. Article, Section, subsection and Exhibit references herein are to such Articles, Sections, subsections and Exhibits of this Agreement unless otherwise specified. All titles or headings to Articles, Sections, subsections or other divisions of this Agreement or the exhibits hereto, if any, are only for the convenience of the parties and shall not be construed to have any effect or meaning with respect to the other content of such Articles, Sections, subsections, other divisions or exhibits, such other content being controlling as the agreement among the parties hereto. Whenever the context requires, reference herein made to the single number shall be understood to include the plural; and likewise, the plural shall be understood to include the singular. Words denoting sex shall be construed to include the masculine, feminine and neuter, when such construction is appropriate; and specific enumeration shall not exclude the general but

shall be construed as cumulative. Definitions of terms defined in the singular or plural shall be equally applicable to the plural or singular, as the case may be, unless otherwise indicated.

ARTICLE II.
AMENDMENT TO CREDIT AGREEMENT

     Section 2.01 Increase in Commitments. The Lenders and the Borrower hereby agree that Schedule II attached to the Credit Agreement is hereby replaced in its entirety with the Schedule II attached hereto.

     Section 2.02 Increase in Borrowing Base. The Lenders and the Borrower hereby agree that as of the Effective Date the Borrowing Base shall be $170,000,000 and such Borrowing Base shall remain in effect until the Borrowing Base is redetermined in accordance with the Credit Agreement.

ARTICLE III.
REPRESENTATIONS AND WARRANTIES

     Section 3.01 Borrower Representations and Warranties. The Borrower represents and warrants that: (a) the representations and warranties contained in Article IV of the Credit Agreement and the representations and warranties contained in the Security Instruments, the Guaranties, and each of the other Loan Documents are true and correct in all material respects on and as of the Effective Date, as though made on and as of such date, except those representations and warranties that speak of a certain date, which representations and warranties were true and correct as of such date; (b) no Default has occurred and is continuing; (c) the execution, delivery and performance of this Agreement and the Borrowings up to the aggregate Commitment as amended hereby, are within the corporate power and authority of the Borrower and have been duly authorized by appropriate corporate action and proceedings; (d) this Agreement constitutes a legal, valid, and binding obligation of the Borrower enforceable in accordance with its terms, except as limited by applicable bankruptcy, insolvency, reorganization, moratorium, or similar laws affecting the rights of creditors generally and general principles of equity; (e) there are no governmental or other third party consents, licenses and approvals required in connection with the execution, delivery, performance, validity and enforceability of this Agreement; and (f) the Liens under the Security Instruments are valid and subsisting and secure Borrower’s obligations under the Loan Documents.

     Section 3.02 Guarantors Representations and Warranties. Each Guarantor represents and warrants that: (a) the representations and warranties contained in Article IV of the Credit Agreement and the representations and warranties contained in the Security Instruments, the Guaranties, and each of the other Loan Documents are true and correct in all material respects on and as of the Effective Date, as though made on and as of such date, except those representations and warranties that speak of a certain date, which representations and warranties were true and correct as of such date; (b) after giving effect to the terms of this Agreement, no Default has occurred and is continuing; (c) the execution, delivery and performance of this Agreement are within the corporate power and authority of such Guarantor and have been duly authorized by appropriate corporate action and proceedings; (d) this Agreement constitutes a legal, valid, and binding obligation of such Guarantor enforceable in accordance with its terms, except as limited by applicable bankruptcy, insolvency, reorganization, moratorium, or similar

-2-

laws affecting the rights of creditors generally and general principles of equity; (e) there are no governmental or other third party consents, licenses and approvals required in connection with the execution, delivery, performance, validity and enforceability of this Agreement; (f) it has no defenses to the enforcement of its Guaranty; and (g) the Liens under the Security Instruments are valid and subsisting and secure such Guarantor’s obligations under the Loan Documents.

ARTICLE IV.
CONDITIONS

     This Agreement contained herein shall become effective and enforceable against the parties hereto, and the Credit Agreement shall be amended as provided herein, upon the occurrence of the following conditions precedent:

     Section 4.01 Documents; Certificates. The Administrative Agent shall have received multiple original counterparts, as requested by the Administrative Agent, of:

          (a) this Agreement duly and validly executed and delivered by duly authorized officers of the Borrower, the Guarantors, the Administrative Agent, and the Lenders,

          (b) copies, certified as of the date of this Agreement by a Responsible Officer of the Borrower of (A) the resolutions of the board of directors of the Borrower approving the increase in the Commitments to the amount listed on the new Schedule II attached hereto, (B) the certificate of incorporation and the bylaws of the Borrower, and (C) all other documents evidencing other necessary corporate action and governmental approvals, if any, with respect to this Agreement, the new Notes, and the other Loan Documents,

          (c) new Notes representing the increased Commitments of the Lenders as set forth in the new Schedule II, duly and validly executed and delivered by the Borrower,

          (d) the Borrower shall have paid a fee in the amount of $131,250 for the account of the Lenders in consideration of the Borrowing Base increase as required under Section 2.08(d) of the Credit Agreement, and

          (e) such other instruments, documents and amendments or supplements as the Administrative Agent may reasonably request.

     Section 4.02 No Default. No Default shall have occurred and be continuing as of the Effective Date.

     Section 4.03 Representations. The representations and warranties in this Agreement shall be true and correct in all material respects.

ARTICLE V.
MISCELLANEOUS

     Section 5.01 Effect on Loan Documents; Acknowledgments.

          (a) The Borrower acknowledges that on the date hereof all Obligations are payable without defense, offset, counterclaim or recoupment.

-3-

          (b) The Administrative Agent, the Issuing Lender, and the Lenders hereby expressly reserve all of their rights, remedies, and claims under the Loan Documents. Nothing in this Agreement shall constitute a waiver or relinquishment of (i) any Default or Event of Default under any of the Loan Documents other than as expressly set forth above, (ii) any of the agreements, terms or conditions contained in any of the Loan Documents other than as expressly set forth above, (iii) any rights or remedies of the Administrative Agent, the Issuing Lender or any Lender with respect to the Loan Documents, or (iv) the rights of the Administrative Agent, any Issuing Lender or any Lender to collect the full amounts owing to them under the Loan Documents.

          (c) Each of the Borrower, the Guarantors, Administrative Agent, Issuing Lender, and Lenders does hereby adopt, ratify, and confirm the Credit Agreement, as amended hereby, and acknowledges and agrees that the Credit Agreement, as amended hereby, and all other Loan Documents are and remain in full force and effect, and each of the Borrower and the Guarantors acknowledges and agrees that its liabilities under the Credit Agreement and the other Loan Documents are not impaired in any respect by this Agreement or the consents granted hereunder.

          (d) From and after the Effective Date, all references to the Credit Agreement and the Loan Documents shall mean such Credit Agreement and such Loan Documents as amended by this Agreement.

          (e) This Agreement is a Loan Document for the purposes of the provisions of the other Loan Documents. Without limiting the foregoing, any breach of representations, warranties, and covenants under this Agreement shall be a Default or Event of Default, as applicable, under the Credit Agreement.

     Section 5.02 Reaffirmation of the Guaranty. Each Guarantor hereby ratifies, confirms, acknowledges and agrees that its obligations under its Guaranty are in full force and effect and that such Guarantor continues to unconditionally and irrevocably guarantee the full and punctual payment, when due, whether at stated maturity or earlier by acceleration or otherwise, all of the Guaranteed Obligations (as defined in its Guaranty), as such Guaranteed Obligations may have been amended by this Agreement, and its execution and deliver of this Agreement does not indicate or establish an approval or consent requirement by such Guarantor under its Guaranty in connection with the execution and delivery of amendments to the Credit Agreement, the Notes or any of the other Loan Documents.

     Section 5.03 Counterparts. This Agreement may be signed in any number of counterparts, each of which shall be an original and all of which, taken together, constitute a single instrument. This Agreement may be executed by facsimile signature and all such signatures shall be effective as originals.

     Section 5.04 Successors and Assigns. This Agreement shall be binding upon and inure to the benefit of the Lenders, the Borrower and the Administrative Agent hereto and their respective successors and assigns permitted pursuant to the Credit Agreement.

     Section 5.05 Invalidity. In the event that any one or more of the provisions contained in this Agreement shall for any reason be held invalid, illegal or unenforceable in any respect,

-4-

such invalidity, illegality or unenforceability shall not affect any other provision of this Agreement.

     Section 5.06 Governing Law. This Agreement shall be deemed to be a contract made under and shall be governed by and construed in accordance with the laws of the State of Texas.

     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.

[SIGNATURES BEGIN ON NEXT PAGE]

-5-

     EXECUTED effective as of the date first above written.

	MARINER ENERGY, INC.
	By:	/s/ Xxxx X. Xxxxxx
		Xxxx X. Xxxxxx
		Vice President and Chief Financial Officer
	MARINER LP LLC
	By:	/s/ Xxxx X. Xxxxxx
		Xxxx X. Xxxxxx
		Vice President and Chief Financial Officer

		MARINER ENERGY TEXAS LP, a Delaware limited partnership
		By:		Mariner Energy, Inc., its sole general partner
				By:		/s/ Xxxx X. Xxxxxx
						Xxxx X. Xxxxxx
						Vice President and Chief Financial
						Officer

	UNION BANK OF CALIFORNIA, N.A., as Administrative Agent, as Issuing Lender, and as a Lender
	By:	/s/ Xxxxxx Xxxxxxxxx
		Xxxxxx Xxxxxxxxx, Senior Vice President
	By:	/s/ Xxx Xxxxx
		Xxx Xxxxx, Vice President

Signature Page to Amendment No. 5
(Mariner Energy, Inc.)

		BNP PARIBAS, as Joint Lead Arranger, as Syndication
		Agent and as a Lender
		By:	/s/ Xxxxxxx X. Xxxxxxx
		Name:		Xxxxxxx X. Xxxxxxx
		Title:		Managing Director
		By:	/s/ Xxxxx Xxxxxx
		Name:		Xxxxx Xxxxxx
		Title:		Vice President

Signature Page to Amendment No. 5
(Mariner Energy, Inc.)

		JPMORGAN CHASE BANK, N.A.
		By:	/s/ Xxxxxxx Xxxxxxxxx-Xxxxx
		Name:		Xxxxxxx Xxxxxxxxx-Xxxxx
		Title:		Vice President

Signature Page to Amendment No. 5
(Mariner Energy, Inc.)

		AMEGY BANK NATIONAL ASSOCIATION
		By:		/s/ Xxxxxxx X. Xxxxxx, III
		Name:		Xxxxxxx X. Xxxxxx, III
		Title:		Vice President, Energy Lending

Signature Page to Amendment No. 5
(Mariner Energy, Inc.)

		GUARANTY BANK
		By:	/s/ Xxxxx X. Xxxxxx III
		Name:		Xxxxx X. Xxxxxx III
		Title:		Senior Vice President

Signature Page to Amendment No. 5
(Mariner Energy, Inc.)

		XXXXXX XXXXXXX FINANCING, INC.
		By:		/s/ Xxxxx X. Xxxxxx
		Name:		Xxxxx X. Xxxxxx
		Title:		Vice President

Signature Page to Amendment No. 5
(Mariner Energy, Inc.)

SCHEDULE II
BORROWER, ADMINISTRATIVE AGENT, AND LENDER INFORMATION

Each of the commitments to lend set forth herein is governed by the terms of the Credit Agreement which provides for, among other things, borrowing base limitations which may restrict the Borrowers’ ability to request (and the Lenders’ obligation to provide) Credit Extensions to a maximum amount which is less than the commitments set forth in this Schedule II.

Borrower:		Office:
Mariner Energy, Inc.		Address for Notices:
		0000 XxxxXxxx Xxxx.,
		Xxxxxxxx 0, Xxxxx 000
		Xxxxxxx, Xxxxx 00000
		Telecopier Number: 000-000-0000
		Attention: Xxxx Xxxxxx

Administrative Agent:		Applicable Lending Offices:
Union Bank of California, N.A.		Address for Notices:
		0000 Xxxxxxx Xxxxx
		000 X. Xxxxx
		Xxxxxx, Xxxxx 00000
		Telecopier Number: 000-000-0000
		Attention: Xxx Xxxxx

Lenders:		Applicable Lending Offices:
Union Bank of California, N.A.		U.S. Domestic Lending Office:
		000 Xxxxx Xxxxxxxx Xxxxxx, 00xx Floor
Tranche A Commitment: [$41,666,667]		Xxx Xxxxxxx, Xxxxxxxxxx 00000
Tranche B Commitment: $0		Eurodollar Lending Office:
		000 Xxxxx Xxxxxxxx Xxxxxx, 00xx Xxxxx
		Xxx Xxxxxxx, Xxxxxxxxxx 00000
		Address for Notices:
		000 Xxxxx Xxxxxxxx Xxxxxx, 00xx Xxxxx
		Xxx Xxxxxxx, Xxxxxxxxxx 00000
		Telecopier Number: 000-000-0000 Attention: Xxx Xxxxx

Schedule II
Borrower, Administrative Agent, and Lender Information

Lenders:		Applicable Lending Offices:
BNP Paribas		U.S. Domestic Lending Office:
		000 Xxxxx Xxxxxx
Xxxxxxx A Commitment: [$41,666,667]		Xxx Xxxx, XX 00000
Tranche B Commitment: $0		Eurodollar Lending Office:
		000 Xxxxx Xxxxxx
		Xxx Xxxx, XX 00000
		Address for Notices:
		000 Xxxxx Xxxxxx
		Xxx Xxxx, XX 00000
		Telecopier Number: 000-000-0000
		Attention: Xxxx Xxxxxx
JPMorgan Chase Bank, N.A.		U.S. Domestic Lending Office:
		1 Bank One Plaza
Tranche A Commitment: [$33,333,333]		IL1-0634
		Xxxxxxx, XX 00000
Tranche B Commitment: $0		Eurodollar Lending Office:
		1 Bank Xxx Xxxxx XX0-0000
		Xxxxxxx, XX 00000
		Address for Notices:
		0 Xxxx Xxx Xxxxx
		XX0-0000
		Xxxxxxx, XX 00000
		Telecopier Number: 000-000-0000
		Attention: Xxxx Xxxx

Schedule II
Borrower, Administrative Agent, and Lender Information

Lenders:		Applicable Lending Offices:
Amegy Bank National Association		U.S. Domestic Lending Office:
		0000 Xxxx Xxx Xxxxxxx #000
Tranche A Commitment: [$25,000,000]		Xxxxxxx, Xxxxx 00000
Tranche B Commitment: $0		Eurodollar Lending Office:
		0000 Xxxx Xxx Xxxxxxx #000
		Xxxxxxx, Xxxxx 00000
		Address for Notices:
		0000 Xxxx Xxx Xxxxxxx #000
		Xxxxxxx, Xxxxx 00000
		Telecopier Number: 000-000-0000
		Attention: Xxxxxx Xxxxxx
Guaranty Bank		U.S. Domestic Lending Office:
		0000 Xxxxxxx Xxxxxx
Xxxxxxx A Commitment: [$33,333,333]		Xxxxxx, Xxxxx 00000
Tranche B Commitment: $0		Eurodollar Lending Office:
		0000 Xxxxxxx Xxxxxx
		Xxxxxx, Xxxxx 00000
		Address for Notices:
		0000 Xxxxxxx Xxxxxx
		Xxxxxx, Xxxxx 00000
		Telecopier Number: 000-000-0000
		Attention: Xxxxx Xxxxx
Xxxxxx Xxxxxxx Financing, Inc.		U.S. Domestic Lending Office:
		000 X. Xxxxxxx Xx.
Xxxxxxx A Commitment: [$25,000,000]		Xxxxxxx, Xx 00000
Tranche B Commitment: $0		Eurodollar Lending Office:
		000 X. Xxxxxxx Xx.
		Xxxxxxx, Xx 00000
		Address for Notices:
		000 X. Xxxxxxx Xx.
		Xxxxxxx, Xx 00000
		Telecopier Number: 000-000-0000 Attention: Xxxxxx Xxxxxx

Schedule II
Borrower, Administrative Agent, and Lender Information