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Published April 05, 2013, 12:00 AM

USS Thresher


In this July 9, 1960 handout file photo provided by the U.S. Navy, the nuclear-powered submarine USS Thresher is launched at the Portsmouth Naval Shipyard in Kittery, Maine. Fifty years ago 129 men lost their lives when the sub sank during deep-dive testing off Cape Cod. The deadliest submarine disaster in U.S. history delivered a blow to national pride during the Cold War and became the impetus for safety improvements. (AP Photo/U.S. Navy, file)
Read the article: US sub sinking 50 years ago led to safety changes