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One hundred twenty-nine American sailors die when the submarine USS Thresher sinks at sea.

Historical image related to One hundred twenty-nine American sailors die when the submarine USS Thresher sinks at sea. from April 10, 1963

Submarine

Watercraft capable of independent underwater operation

A submarine is a watercraft capable of independent operation underwater. The term "submarine" is also sometimes used historically or informally to refer to remotely operated vehicles and robots, or to medium-sized or smaller vessels. Submarines are referred to as boats rather…
Source: Wikipedia (CC BY-SA)

USS Thresher (SSN-593)

United States Navy submarine (1961–63)

USS Thresher (SSN-593) was the lead boat of her class of nuclear-powered attack submarines in the United States Navy. She was the U.S. Navy's second submarine to be named after the thresher shark.
Source: Wikipedia (CC BY-SA)