{"product_id":"why-the-uss-thresher-ssn-593-was-lost-9781608881680","title":"Why the USS Thresher (SSN 593) Was Lost","description":"\u003cp\u003eThe US nuclear submarine THRESHER (SSN-593) was lost because standard compensation procedures to adjust for hull compression during the deep-dive on 10 April 1963 were not followed. Consequently, THRESHER was heavy (negatively buoyant) at test-depth (1300 feet) and unable to deballast because adiabatic cooling froze moisture in the air-lines to the ballast tanks, blocking those lines.\u003c\/p\u003e\u003cp\u003eOperation of the Reactor (Main) Coolant Pumps in FAST (2-pole mode) may have contributed to a reactor scram (shut-down) and loss of propulsion at 0909.0R (local time). THRESHER sank at an average rate of 120ft\/min from test-depth (1300-feet) at 0909.0R to collapse at 09:18:24R at a depth of 2400-feet (1070 psi) in 1\/20th of a second, too fast to be cognitively recognized by those aboard who - although they knew collapse was imminent - never knew it was occurring.\u003c\/p\u003e\u003cp\u003eThe Navy Court of Inquiry (COl) dismissed the results of their own test which established conclusively that flooding at test-depth - the COI's assessed cause of the disaster - would have been a catastrophic\u003cbr\u003e event and would not have been reported by THRESHER to her escort ship, the USS SKYLARK (ASR 20), at 0913R as \"experiencing minor difficulties.\" Multiple lines of evidence - discussed in detail by Chapter\u003cbr\u003e 1 of this assessment - confirm there was no flooding prior to collapse of the pressure-hull at great depth.\u003c\/p\u003e\u003cbr\u003e","brand":"Nimble Books","offers":[{"title":"Default Title","offer_id":50557067231506,"sku":"9781608881680","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0831\/4771\/8930\/files\/img_d019742d-ce99-4680-b1c4-b7cef1e488f2.jpg?v=1731769967","url":"https:\/\/surprise-castle.myshopify.com\/products\/why-the-uss-thresher-ssn-593-was-lost-9781608881680","provider":"Surprise Castle","version":"1.0","type":"link"}