What You Need to Know: In April 1963, the USS Thresher (SSN-593), a state-of-the-art nuclear-powered submarine, tragically sank during deep-sea trials off the coast of Massachusetts, killing all ...
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The Sad Reason a Navy Submarine Was 'Nearly Broken in Half'The first was the USS Thresher (SSN-593), the lead boat of a class of nuclear-powered attack submarines developed in the late 1950s. She sank during deep tests on April 10, 1963.
The tragedy that would become the infamous USS Thresher incident began on April 30, 1961, when the submarine went underway to initiate sea trials from the Portsmouth Naval Shipyard in Maine.
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