It became the final resting place for all 52 crewmembers. The USS Thresher (SSN-593) was the first nuclear attack submarine of its class. In 1963, it conducted a series of deep-dive tests off the ...

Still, two were lost to accidents. 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 ...