USS Thresher (SSN-593)
| USS Thresher (SSN-593) ： ウィキペディア英語版|
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. This was the first U.S. nuclear submarine lost at sea.
==Significance of design and loss==
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. In writing about its significance shortly after its loss, the (then) Commander of Submarine Force Atlantic – in the March 1964 issue of the U.S. Naval Institute's monthly journal ''Proceedings'' – stated that, "the Navy had depended upon this performance to the extent that it had asked for and received authority to build 14 of these ships, as well as an additional 11 SSNs with very much the same characteristics. This was the first time since World War II that we had considered our design sufficiently advanced to embark upon construction of a large class of general-purpose attack submarines." During its one year of trial operations – August 1961 – July 1962 – the ''Thresher'' fulfilled every expectation as the most advanced nuclear attack submarine in the world.
As the lead vessel, the class name should have been Thresher-class. However, when the ''Thresher'' was struck from the Naval Vessel Register on 16 April 1963, out of respect for naval tradition its name was retired and the class name was changed to that of the second boat, : thus, despite being the lead boat, the ''Thresher'' is, officially, referred to as a Permit-class submarine. Having been "lost at sea", ''Thresher'' was not decommissioned by the U.S. Navy and remains on “Eternal Patrol".
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