A retired U.S. Navy submarine commander has won a lawsuit forcing the Navy to release its report on what happened to the USS Thresher, a nuclear-powered attack submarine that sank during diving tests in 1963. The loss of the submarine has never been fully explained, and the Navy has never released the report on the sub’s sinking.
USS Thresher was the first of its class, a new type of fast, deep diving attack submarine. The Thresher-class subs used a streamlined hull designed for fast underwater travel. With a torpedo-like hull design and a S5W nuclear reactor, the Thresher class could make 20 knots on the surface and 30 knots underwater—the reverse of World War II-era submarines designed to spend most of their time on the surface. The submarines were 278 feet long, 31 feet wide, and carried Mk. 37 homing torpedoes for use against surface and subsurface targets, SUBROC anti-submarine torpedoes, and sea mines.
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