1 EXHIBIT 10.29 FIRST AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT THIS FIRST AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT (this "First Amendment") is made and entered into as of the 31st day of December, 1999, by and among MARINER ENERGY, INC., a Delaware corporation ("Borrower"), BANK OF AMERICA, N.A., as Administrative Agent ("Administrative Agent"), TORONTO DOMINION (TEXAS), INC., as Co-Agent ("Co-Agent") and BANK OF AMERICA, N.A., TORONTO DOMINION (TEXAS), INC., THE BANK OF NOVA SCOTIA and ABN AMRO BANK N.V. (individually a "Bank" and collectively the "Banks"). WHEREAS, Borrower, NationsBank, N.A. (which changed its name to Bank of America, N.A., and then merged with and into Bank of America National Trust and Savings Association, which surviving entity then changed its name to Bank of America, N.A.), as Administrative Agent, Co-Agent and the Banks entered into that certain Amended and Restated Credit Agreement dated June 28, 1999 (the "Credit Agreement"); WHEREAS, Borrower, Administrative Agent, Co-Agent and the Banks desire to amend certain terms and provisions of the Credit Agreement, as set forth herein. NOW, THEREFORE, FOR AND IN CONSIDERATION of the mutual covenants and agreements contained herein, the parties hereto agree as follows: 1. Section 10.2 of the Credit Agreement is deleted in its entirety, and the following is substituted in its place: Section 10.2. Interest Coverage Ratio. Borrower will not permit the consolidated Interest Coverage Ratio of Borrower and Guarantor as of the end of the Fiscal Quarter ending December 31, 1999 to be less than 2.00 to 1.0. Borrower will not permit the consolidated Interest Coverage Ratio of Borrower and Guarantor as of the end of any other Fiscal Quarter to be less than 2.25 to 1.0. 1. The closing of the transactions contemplated by this First Amendment is subject to the satisfaction of the following conditions: (a) All legal matters incident to the transactions herein contemplated shall be satisfactory to counsel to Administrative Agent; and (b) Administrative Agent shall have received a fully executed copy of this First Amendment. 1. Except as amended hereby, the Credit Agreement shall remain unchanged, and the terms, conditions and covenants of the Credit Agreement shall continue and be binding upon the parties hereto. 1. Within thirty (30) days of the next action, whether by consent or at a meeting, of the Board of Directors of Borrower and Guarantor, Borrower will deliver an executed copy of resolutions 2 of the Board of Directors of Borrower and Guarantor in form and substance reasonably satisfactory to Administrative Agent ratifying the execution, delivery and performance of this First Amendment and all documents, instruments and certificates referred to herein. 1. Each of the terms defined in the Credit Agreement is used in this First Amendment with the same meaning, except as otherwise indicated in this First Amendment. Each of the terms defined in this First Amendment is used in the Credit Agreement with the same meaning, except as otherwise indicated in the Credit Agreement. 1. This First Amendment may be executed in any number of counterparts, each of which shall constitute an original, but all of which, when taken together, shall constitute but one agreement. 1. THIS FIRST AMENDMENT SHALL BE DEEMED TO BE A CONTRACT UNDER, SUBJECT TO, AND SHALL BE CONSTRUED FOR ALL PURPOSES IN ACCORDANCE WITH THE LAWS OF THE STATE OF TEXAS. 1. THE CREDIT AGREEMENT, AS AMENDED, REPRESENTS THE FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES. IN WITNESS WHEREOF, the parties have caused this First Amendment to be executed by their duly authorized officers as of the day and year first above written. MARINER ENERGY, INC. By: /s/ Frank Pici Name: Frank Pici Title: Vice President Finance BANK OF AMERICA, N.A., as Administrative Agent By: /s/ James Ducoto Name: James Ducoto Title: Vice President TORONTO DOMINION (TEXAS), INC., as Co-Agent By: /s/ Mark A. Bario Name: Mark A. Bario Title: Vice President - -2- 3 BANK OF AMERICA, N.A. By: /s/ Mark Barid Name: Mark Barid Title: Vice President TORONTO DOMINION (TEXAS), INC. By: /s/ [ILLEGIBLE] Name: [ILLEGIBLE] Title: Vice President THE BANK OF NOVA SCOTIA By: /s/ [ILLEGIBLE] Name: [ILLEGIBLE] Title: Vice President ABN AMRO BANK N.V. By: /s/ Matt McCain Name: Matt McCain Title: Vice President By: /s/ Deanna Breland Name: Deanna Breland Title: Vice President The undersigned Guarantor, Mariner Holdings, Inc., executes this First Amendment to evidence its acknowledgment of the terms and provisions hereof and to evidence its agreements to the matters set forth herein. MARINER HOLDINGS, INC. By: /s/ Frank Pici Name: Frank Pici Title: Vice President - Finance - -3-