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Permit is the name of a class of American nuclear powered fighter submarines (ANNs). Units of this type were built in the years 1958-1967. In total, fourteen units of this type were created. The Permit-class ship was 84.9 m long, 9.7 m wide, and had a displacement of approximately 4,300 tons. The maximum underwater speed is around 27-28 knots. The ship had four 533 mm torpedo tubes.
The Permit-class ships (also known as the Tresher-class until the USS Tresher sank) were developed and put into production to replace Skipjack ships. Compared to their predecessors, they differed in several important elements. First of all, they were larger than their predecessors in terms of displacement and hull length. They also had much better gym noise reduction and were generally much quieter than Skipjack-class ships. They also had revised armament, which included not only torpedoes, but also rockets and rocket-torpedoes, making this class of ships the first truly multi-purpose submarines in the US Navy. Vessels of this class were also made of high-strength steel (HY80), which probably allowed to reach a submersion depth of 400 meters. However, it was probably the problems with welding this steel that led to the USS Tresher disaster in April 1963. After this tragedy, which consumed the ship with the entire crew, a number of improvements were made to ships of this class that improved their abilities. By 1996, Permit-class ships were decommissioned.
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