Key features of the program include:

• All McDermott shareholders of record are automatically eligible to participate in the program.

• New investors can open an account with as little as $500 (either as a lump sum purchase or ten consecutive withdrawals of $50 each through automatic withdrawals from your checking or savings account).

• There are modest transaction processing fees and brokerage commissions for purchases and sales. These are outlined in the program materials.

• You buy shares in whole dollar amounts rather than a specified quantity of shares. Your account is credited with the appropriate number of full and fractional shares.

• You can build your investment over time by making additional purchases periodically (minimum of $50 per purchase up to a yearly limit of $250,000).

• You can deposit into your account any McDermott Common Stock certificates you may hold or request a certificate for whole shares from your program account at any time. In either case, there is no cost to you.

• You can sell your shares by simply picking up the telephone and instructing Computershare Trust Company, N.A..

• Detailed information on the program may be found in the program materials. This communication does not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities, in any jurisdiction in which such offer, solicitation or sale would be unlawful.

• McDermott International, Inc. has appointed Computershare Trust Company, N.A. as processing agent and administrator for this program. This program is not sponsored or administered by McDermott.

• Securities held in custody by Computershare Trust Company, N.A. are not subject to protection under the Securities Investor Protection Act.