Remembering the 129 souls lost on the USS THRESHER SSN-593, 50 years ago, 10 April 1963, may we never need to use this site for its designed purpose.

On 10 April 1963, after the completion of this work, Thresher began post-overhaul trials. Accompanied by the submarine rescue ship Skylark (ASR-20), she transited to an area some 220 miles east of Cape Cod, Massachusetts, and started deep-diving tests. As these proceeded, garbled communications were received by Skylark, indicating trouble aboard the submarine. It gradually became apparent that she had sunk, taking the lives of 129 officers, crewmen and civilian technicians.