ARCTIC OCEAN  - MARCH 21:  In this handout image provided by the U.S. Navy, The Los Angeles-class submarine USS Annapolis (SSN 760) rests on the Arctic Ocean after breaking through three feet of ice during Ice Exercise (ICEX) 2009 March 21, 2009 in The Arctic Ocean. The U.S. Navy teamed with the University of Washington Applied Physics Laboratory to train in the arctic environment.  (Photo by Tiffini M. Jones/U.S. Navy via Getty Images)