United States of America (USA)
US Seawolf-class attack nuclear submarines were designed during the height of the Cold War. Their primary purpose was to destroy Soviet submarines in icy Arctic waters. A number of innovative elements were used in the construction of Seawolf class units, which was to ensure them a great advantage even over the best submarines of the enemy.
Seawolf-class submarines, primarily designed to " sweep away " the Arctic seas from their Soviet counterparts, lost their main purpose after the end of the Cold War.
Missile submarines of the United States of America.
Thresher was the most modern submarine of the US Navy based on the previous vessels Skipjack and Tullibee, it was a torpedo submarine of the so-called third generation, according to which another 25 were to be built.