U.S. Navy Diver Petty Officer 3rd Class John Seagraves signals that he is okay during a training mission in the icy Thames River at Submarine Base New London in Groton, Conn., on Feb. 7, 2007.   DoD photo by John Narewski, U.S. Navy. (Released)

U.S. Navy Diver Petty Officer 3rd Class John Seagraves signals that he is okay during a training mission in the icy Thames River at Submarine Base New London in Groton, Conn., on Feb. 7, 2007.   DoD photo by John Narewski, U.S. Navy. (Released)

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