Military arctic training. Los Angeles-class submarine USS Annapolis (SSN 760) breaking through three feet of ice when surfacing during the Ice Exercise (ICEX) 2009, in the Arctic Ocean. ICEX is a two-week training exercise about 200 miles from the north coast of Alaska, near Prudhoe Bay, USA. Two Los Angeles-class submarines, USS Helena (SSN 725) and USS Annapolis, participated in the exercise with researchers from the University of Washington Applied Physics Laboratory and personnel from the Navy Arctic Submarine Laboratory. Photographed on 21st March 2009.