Poster submarine Tresher/Permit class

The Thresher / Permit Class, is a class of fourteen US Navy nuclear attack submarines built between 1958 and 1968 and active between 1961 and 1996, until their gradual replacement by the Sturgeon class submarines and Los Angeles.

The first commissioned submarine of this class was the hapless Thresher who gave the class its name.

After the loss of the Thresher, the class changed its name to the second ship in the class, the USS Permit. In fact, on April 10, 1963, the USS Thresher disappeared at sea 220 nautical miles off the east coast of the United States during diving tests, killing 129 people.

It is the first of two American nuclear submarines lost at sea.

On this class of ships, torpedo tubes are moved to the middle of the hull on ships of this class. This change frees up a large amount of front space necessary for the installation of a new generation BQQ-2 sonar with extremely sensitive low frequency sensors.

Initially armed with the Mark 37 torpedo, the Thresher / Permit class was later armed with a modernized Mark 48 version. It was also equipped with MK-57 mines, anti-submarine warfare missiles, and later anti-ship missiles. .

All Thresher / Permit type ships served under typical Cold War conditions, associated with participation in naval exercises with NATO member state fleets, warfare simulations, research and development of new technologies and the fight against enemy submarines, as well as “special operations”.

These operations are generally intelligence-related or involved in monitoring the Soviet Union's submarine fleet and protecting their own submarines, carrying SLBM ballistic missiles.