Assumption Agreement, dated September 29, 2017, by and among McDermott Asia Pacific Sdn. Bhd., Malmac Sdn. Bhd. and Crdit Agricole Corporate and Investment Bank, as administrative agent and collateral agent for the Credit Agreement

Exhibit 4.1

ASSUMPTION AGREEMENT

This Assumption Agreement dated as of September 29, 2017 (this “Assumption Agreement”), is made by MCDERMOTT ASIA PACIFIC SDN. BHD., a Malaysian company limited by shares (“McDermott Asia”), and MALMAC SDN. BHD, a Malaysian company limited by shares (together with McDermott Asia, the “Additional Grantors” and each, an “Additional Grantor”), in favor of Crédit Agricole Corporate and Investment Bank (“CA CIB”), as administrative agent (in such capacity and together with its successors in such capacity, the “Administrative Agent”) for the Lenders and the Issuers and collateral agent (in such capacity and together with its successors in such capacity, the “Collateral Agent”) for the Secured Parties.

WHEREAS, McDermott International, Inc., a Panamanian corporation (the “Borrower”) entered into the Credit Agreement dated as of June 30, 2017 (as amended, restated, supplemented or otherwise modified from time to time, the “Credit Agreement”), with the Lenders, the Issuers and CA CIB, as administrative agent for the Lenders and the Issuers and collateral agent for the Secured Parties. Terms used herein and not otherwise defined herein shall have the meanings assigned to such terms in the Credit Agreement.

WHEREAS, in connection with the Credit Agreement, the Borrower and certain of its Subsidiaries (other than the Additional Grantors) have entered into the Amended and Restated First Lien Pledge and Security Agreement dated as of June 30, 2017 (as amended, restated, supplemented or otherwise modified from time to time, the “Pledge and Security Agreement”), in favor of the Collateral Agent and the Administrative Agent for the benefit of the Secured Parties;

WHEREAS, the Credit Agreement requires each Additional Grantor to become a party to the Pledge and Security Agreement as a Grantor (as defined in the Pledge and Security Agreement) and a Guarantor thereunder; and

WHEREAS, each Additional Grantor has agreed to execute and deliver this Assumption Agreement in order to become a party to the Pledge and Security Agreement as a Grantor and a Guarantor thereunder;

NOW, THEREFORE, IT IS AGREED:

1.Pledge and Security Agreement.  By executing and delivering this Assumption Agreement, each Additional Grantor, as provided in Section 8.14 of the Pledge and Security Agreement, hereby becomes a party to the Pledge and Security Agreement as a Grantor and a Guarantor thereunder with the same force and effect as if originally named therein as a Grantor and a Guarantor.  In accordance with the terms of the Pledge and Security Agreement and without limiting the generality of the foregoing, each Additional Grantor hereby expressly (a) assumes all obligations and liabilities of a Grantor and a Guarantor under the Pledge and Security Agreement; (b) guarantees the Borrower’s Obligations pursuant to Section 2 of the Pledge and Security Agreement; and (c) grants to the Collateral Agent, for the ratable benefit of the Secured Parties, a security interest in such Additional Grantor’s right, title and interest in and to the Collateral (as defined in the Pledge and Security Agreement), wherever located and whether now owned or at any time hereafter acquired by such Additional Grantor or in which such Additional Grantor now has or at any time in the future may acquire any right, title or interest, as security for the prompt and complete payment and performance when due (whether at stated maturity, by acceleration or otherwise) of such Additional Grantor’s Obligations. The information set forth in Annex 1 hereto is hereby added to the information set forth in Schedules 4.3, 4.4 and 4.7 to the Pledge and Security Agreement. Each Additional Grantor hereby makes each of the representations and warranties contained in Section 4 of the Pledge and Security Agreement (as supplemented by, and after giving effect to, this Assumption Agreement and the Schedules attached hereto) as of the date hereof.

2.GOVERNING LAW.  THIS ASSUMPTION AGREEMENT AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES HERETO SHALL BE GOVERNED BY, AND CONSTRUED

AND INTERPRETED IN ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK, WITHOUT REGARD TO ITS CONFLICTS OF LAWS PROVISIONS.

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2

IN WITNESS WHEREOF, the undersigned has caused this Assumption Agreement to be duly executed and delivered as of the date first above written.

[Signature Page to Assumption Agreement]

ANNEX 1

SCHEDULE 4.3

TO PLEDGE AND SECURITY AGREEMENT

PERFECTED FIRST PRIORITY LIENS

UCC Filings

A UCC1 Financing Statement listing the Additional Grantor, as debtor, and the Collateral Agent, as secured party, should be filed in the governmental office set forth below.  Each such UCC1 Financing Statement will need to include a description of the Collateral that complies with Section 9-504 of the Uniform Commercial Code.

ANNEX 1

SCHEDULE 4.4

TO PLEDGE AND SECURITY AGREEMENT

Name; Jurisdiction of Organization, etc.

Prior Names during last 5 years:

None.

Prior Addresses during last 5 years:

The former chief executive office of MALMAC SDN. BHD. was located at 11 Lorong 3, Toa Payoh, Block A #01-01, Jackson Square, Singapore, 319579.

ANNEX 1

SCHEDULE 4.7

TO PLEDGE AND SECURITY AGREEMENT

investment PROPERTY

Pledged Stock:

Pledged LLC Interests:

Pledged Partnership Interests:

Pledged Trust Interests:

None.

Pledged Notes:

None.

Pledged Commodities Contracts:

None.