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The attack submarine USS Annapolis (SSN 760) rests in the Arctic Ocean after surfacing through three feet of ice during Ice Exercise 2009 on March 21, 2009. The two-week training exercise, which is used to test submarine operability and war-fighting capability in Arctic conditions, also involves the USS Helena (SSN 725), the University of Washington and personnel from the Navy Arctic Submarine Laboratory. DoD photo by Petty Officer 1st Class Tiffini M. Jones, U.S. Navy. (Released)