Death of the USS Thresher

"When she first went to sea in April of 1961, the U.S. nuclear submarine Thresher was the most advanced submarine at sea, built specifically to hunt and kill Soviet submarines. On the morning of April 10, 1963, on a test dive off the New England coast, the Thresher sent a message to a support ship above her on the surface: experiencing minor problem ... have positive angle ... attempting to blow. Then came the sounds of air under pressure ... and the sounds of a submarine breaking up. Polmer recounts the dramatic circumstances surrounding her implosion, which killed all 129 men on board, in history's first loss of a nuclear submarine." --