Sea1 Offshore — Proxy Solicitation & Information Statement 2010

Apr 16, 2010

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SIEM OFFSHORE INC.

P R O X Y

I/We ____ being a shareholder of the above Company holding __ shares HEREBY APPOINT the Chairman of the meeting or __ of _____ or failing him ____ of ____ to be my/our proxy to vote for me/us at the meeting of the members to be held at 12:00 noon Cayman Islands local time on Monday, 10 May 2010 (the “ Meeting ”), and at any adjournment thereof at the Company’s offices. My/our proxy should vote as indicated below at such Meeting:

Resolution For* Resolution 1 __ Resolution 2 _ Resolution 3 Resolution 4 Resolution 5 Resolution 6 Resolution 7 Resolution 8 Resolution 9 Resolution 10 ___	Against __ __ __ __ __ __ __ __ __ __	Number of Common Shares ___ __ ___ __ ___ __ ___ __ ___ ___

• Please indicate your voting preference and the number of shares entitled to vote. In the absence of voting instructions for any resolution, the form of proxies will be voted “FOR” such resolution.

Owner or Authorised Signatory for Shares Date NOTES:

• (a) This form of proxy is only for use by a shareholder.

• (b) If you wish to appoint a proxy other than the Chairman of the Meeting, please insert his/her name and address, delete "the Chairman of the Meeting or" and initial all amendments. A proxy need not be a shareholder.

• (c) In the case of a corporation, this form of proxy must be executed under its common seal or under the hand of an officer or attorney duly authorised in writing.

• (d) In the case of joint holders, the vote of the senior who tenders a vote, whether in person or by proxy, will be accepted to the exclusion of the votes of the other joint holders and for this purpose seniority will be determined by the order in which the names stand in the register of members. Names of all joint holders should be stated.

• (e) To be valid, this form of proxy should be received no less than 24 hours prior to the stated time of the Annual General Meeting at either of the following: (1) the offices of Siem Offshore AS at Markensgt. 8, P.O. Box 425, 4664 Kristiansand, Norway, telefax no. +47.37.40.62.86 or (2) the Company’s office at P.O. Box 10718, George Town, Grand Cayman KY1-1006, CAYMAN ISLANDS, telefax no. +1.345.946.3342.

• (f) Completion of this form of proxy will not prevent you from attending and voting at the Meeting.

• (g) A proxy may vote on a show of hands or on a poll.