AND THE GUARANTORS NAMED HEREIN SECOND SUPPLEMENTAL INDENTURE Dated as of January 17, 2013 THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., AS TRUSTEE

Exhibit 4.2.4

KEY ENERGY SERVICES, INC.

AND

THE GUARANTORS NAMED HEREIN

6.750% SENIOR NOTES DUE 2021

SECOND SUPPLEMENTAL INDENTURE

Dated as of January 17, 2013

THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.,

AS TRUSTEE

THIS SECOND SUPPLEMENTAL INDENTURE, dated as of January 17, 2013, is among Key Energy Services, Inc., a Maryland corporation (the “Company”), each of the parties identified under the caption “Subsidiary Guarantors” on the signature page hereto (the “Subsidiary Guarantors”) and The Bank of New York Mellon Trust Company, N.A., as Trustee.

RECITALS

WHEREAS, the Company, the Subsidiary Guarantors party thereto and the Trustee entered into an Indenture, dated as of March 4, 2011, as supplemented prior to the date hereof (the “Indenture”), pursuant to which the Company has originally issued $675,000,000 in principal amount of 6.750% Senior Notes due 2021 (the “Notes”);

WHEREAS, Section 9.01 of the Indenture provides that the Company, the Subsidiary Guarantors and the Trustee may amend or supplement the Indenture without notice to or consent of any Holder to reflect the release of any Subsidiary Guarantor, as provided for in the Indenture;

WHEREAS, Key Energy Services California, Inc., a Texas corporation (“Key California”) is a Subsidiary Guarantor under the Indenture;

WHEREAS, Section 10.09(a) of the Indenture provides that a Subsidiary Guarantor may sell or otherwise dispose of all or substantially all of its properties or assets to, or consolidate with or merge with or into the Company or another Subsidiary Guarantor under the Indenture;

WHEREAS, the Company has taken all actions required to effect the merger, effective December 31, 2012, of Key California and Key Marine Services, LLC, a Delaware limited liability company, with and into Key Energy Services, LLC, a Texas limited liability company and a Subsidiary Guarantor under the Indenture; and

WHEREAS, all acts and things prescribed by the Indenture, by law and by the charter and the bylaws (or comparable constituent documents) of the Company, of the Subsidiary Guarantors and of the Trustee necessary to make this Second Supplemental Indenture a valid instrument legally binding on the Company, the Subsidiary Guarantors and the Trustee, in accordance with its terms, have been duly done and performed;

NOW, THEREFORE, to comply with the provisions of the Indenture and in consideration of the above premises, the Company, the Subsidiary Guarantors and the Trustee covenant and agree for the equal and proportionate benefit of the respective Holders of the Notes as follows:

ARTICLE 1

Section 1.01. This Second Supplemental Indenture is supplemental to the Indenture and does and shall be deemed to form a part of, and shall be construed in connection with and as part of, the Indenture for any and all purposes.

Section 1.02. This Second Supplemental Indenture shall become effective immediately upon its execution and delivery by each of the Company, the Subsidiary Guarantors and the Trustee.

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ARTICLE 2

Section 2.01. Key California is hereby released from its guarantee and related obligations under the Indenture and will hereafter cease to be a Subsidiary Guarantor under, or party to, the Indenture. The notation on the Securities relating to the Guarantee shall be deemed to exclude the name of Key California and the signatures of Officers of Key California on its behalf.

ARTICLE 3

Section 3.01. Except as specifically modified herein, the Indenture and the Notes are in all respects ratified and confirmed (mutatis mutandis) and shall remain in full force and effect in accordance with their terms with all capitalized terms used herein without definition having the same respective meanings ascribed to them as in the Indenture.

Section 3.02. Except as otherwise expressly provided herein, no duties, responsibilities or liabilities are assumed, or shall be construed to be assumed, by the Trustee by reason of this Second Supplemental Indenture. This Second Supplemental Indenture is executed and accepted by the Trustee subject to all the terms and conditions set forth in the Indenture with the same force and effect as if those terms and conditions were repeated at length herein and made applicable to the Trustee with respect hereto. The Trustee makes no representations as to the validity or sufficiency of this Second Supplemental Indenture. The recitals and statements herein are deemed to be those of the Company and Subsidiary Guarantors and not of the Trustee.

Section 3.03. THE LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO CONSTRUE AND ENFORCE THIS SECOND SUPPLEMENTAL INDENTURE.

Section 3.04. The parties may sign any number of copies of this Second Supplemental Indenture. Each signed copy shall be an original, but all of such executed copies together shall represent the same agreement.

[NEXT PAGE IS SIGNATURE PAGE]

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IN WITNESS WHEREOF, the parties hereto have caused this Second Supplemental Indenture to be duly executed, all as of the date first written above.

KEY ENERGY SERVICES, INC.
By:		/s/ XXXX X. XXX
		Xxxx X. Xxx
		Vice President and Controller
By:		/s/ X. XXXXXXXX XXXXXX
		X. Xxxxxxxx Xxxxxx
		Vice President and Treasurer
GUARANTORS:
KEY ENERGY SERVICES, LLC
By:		/s/ X. XXXXXXXX XXXXXX
		X. Xxxxxxxx Xxxxxx
		Vice President and Treasurer
KEY ENERGY SERVICES (MEXICO), LLC
By:		/s/ X. XXXXXXXX XXXXXX
		X. Xxxxxxxx Xxxxxx
		Vice President and Treasurer
MISR KEY ENERGY INVESTMENTS, LLC
By:			/s/ X. XXXXXXXX XXXXXX
			X. Xxxxxxxx Xxxxxx
			Vice President and Treasurer
MISR KEY ENERGY SERVICES, LLC
By:			/s/ X. XXXXXXXX XXXXXX
			X. Xxxxxxxx Xxxxxx
			Vice President and Treasurer
KEY ENERGY MEXICO, LLC

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By:			/s/ X. XXXXXXXX XXXXXX
			X. Xxxxxxxx Xxxxxx
			Vice President and Treasurer

THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Trustee
By:		/s/ XXXXX XXXXXXX-XXXXX
		Xxxxx Xxxxxxx-Xxxxx
		Vice President

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