"On the morning of April 10, 1963, the USS Thresher (SSN 593) proceeded to conduct sea trials about 200 miles off the coast of Cape Cod. At 9:13 a.m., the USS Skylark (a surface vessel assigned to assist Thresher) received a signal, via underwater telephone, indicating that the submarine was experiencing minor difficulties, have positive up-angle, attempting to blow.

Shortly afterward, the Skylark received a series of garbled, undecipherable message fragments from the Thresher. At 9:18 a.m., the Skylark’s sonar picked up the sounds of the submarine breaking apart. All 129 hands were lost -- 112 military and 17 civilian technicians.

Text from (this page). For further info see the NOVA show Submarines, Secrets, and Spies for more Thresher and Scorpion (which departed and never returned) info."

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