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Today in History: USS Thresher sinks during deep-diving tests, all lost

4/10/2026

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Summary

Story summary

On April 10, 1963, the USS Thresher (SSN-593), a nuclear-powered attack submarine, sank during deep-diving tests in the North Atlantic Ocean. All 129 crew members aboard perished in the disaster, marking one of the deadliest incidents in U.S. naval history and prompting significant changes in submarine safety protocols.

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Story summary

On April 10, 1963, the USS Thresher (SSN-593), a nuclear-powered attack submarine, sank during deep-diving tests in the North Atlantic Ocean. All 129 crew members aboard perished in the disaster, marking one of the deadliest incidents in U.S. naval history and prompting significant changes in submarine safety protocols.