Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Registration Statement on Form S-3 of our reports dated March 3, 2014, relating to the consolidated financial statements and financial statement schedule of McDermott International, Inc., and the effectiveness of McDermott International, Inc.’s internal control over financial reporting, appearing in the Annual Report on Form 10-K of McDermott International, Inc. for the year ended December 31, 2013, and to the reference to us under the heading “Experts” in the Prospectus, which is part of this Registration Statement.

/s/ DELOITTE & TOUCHE LLP

Houston, Texas

March 31, 2014