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Board of Inquiry in to the loss of the USS Thresher (SSN 593)
The Thresher was lost on 10 April 1963. In the decades since, all sorts of theories and conjectures have floated about the causes of her loss mostly due to the secrecy surrounding it.
Today a slightly redacted copy was made available of the Record of Proceedings of the Board of Inquiry.
(under heavy load, please be patient)
https://www.secnav.navy.mil/foia/readingroom/HotTopics/THRESHER%20RELEASE/THRESHER%20pg%201-300.pdf