USS Thresher (SSN-593)
Built in Portsmouth, NH, the USS Thresher (SSN-593) was the lead ship of her class, and commissioned on 3 August, 1961. Thresher operated in the Atlantic, along the Eastern US, for her entire career, excepting a trip to Puerto Rico in October, 1961, during which her diesel generator broke down, necessitating the USS Cavalla (SS-244) to provide Thresher with power to restart her reactor. Thresher was taken in for overhaul in July, 1962, and the work was completed on 8 April, 1963. Leaving port the next day for trials, Thresher disappeared into the depths on the 10th, leaving garbled messages in her wake. 129 men, some civilian shipyard workers, are on eternal patrol with the sub. The loss was blamed on a combination of flooding, and frozen air vents, but declassified documentation has led some to believe that there was no flooding, and that a faulty electrical circuit triggered the loss of power that doomed Thresher.