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USS Thresher: A loss. A legacy.
April 6, 2023
USS Thresher (SSN-593) was the lead nuclear-attack submarine of her class and was commissioned on August 3, 1961, at Portsmouth Naval Shipyard, Kittery, Maine. Following commissioning, she completed trials in the Atlantic and Caribbean areas testing her new technological systems and weapons. On April 10, 1963, following overhaul, Thresher began deep-diving tests, along with USS Skylark (ASR-20), about 220 miles east of Cape Cod, Massachusetts. As the tests proceeded, Skylark received garbled communications from her which eventually stopped. It became apparent she had sunk taking the lives of the 129 officers, crewmen, and civilian technicians.

NAVSEA Announces Leadership and Operation Changes for its Industrial Operations Directorate (NAVSEA 04)
February 2, 2022