USS Tresher (SSN-593)

When it was designed and built Thresher was the most advanced attack submarine of its time: it was faster (with the exception of the USS Skipjack (SSN-585) class) and quieter than any submarine ever built, and able to dive deeper than any submarine in the world. SSN 593 was considered the most advanced weapons system of its day, created specifically to seek out and destroy Soviet submarines. Its new sonar (both passive and active) was able to detect other submarines and ships at greater range, and it was intended to launch the U.S. Navy's newest anti-submarine missile, SUBROC.
The second USS Thresher (SSN-593) was the lead boat of her class of nuclear-powered attack submarines in the United States Navy. Her loss at sea in the North Atlantic during deep-diving tests approximately 220 miles east of Boston, Massachusetts, on 10 April 1963 was a watershed event for the U.S. Navy, leading to the implementation of a rigorous submarine safety program known as SUBSAFE. Judging by the 129 crew members and shipyard personnel who were killed in the incident, historic context and significance, the sinking of Thresher was then, and remains today, the world's worst submarine disaster. As the first nuclear submarine lost at sea, its disappearance generated international shock and sympathy.
Class & type: Permit-class submarine
Displacement: 3,540 short tons (3,210 t) light, 3,770 short tons (3,420 t) submerged
Length: 279 ft (85 m)
Beam: 32 ft (9.8 m)
Draft: 26 ft (7.9 m)
Propulsion: 1 Westinghouse S5W PWR, Westinghouse Geared Turbines 15,000 shp (11 MW)
Speed: 20+ kts
Complement: 16 officers, 96 men
Armament: 4 × 21 in (530 mm) torpedo tubes amidships.

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