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The second USS Thresher (SSN-593) was the lead boat of her class of nuclear-powered attack submarines in the United States Navy. The bathyscaphe was placed on board USNS Private Francis X. McGraw and also shipped, via the Panama Canal, to Boston.Additional operations were conducted at the loss site of Thresher that was commenced by the first Trieste the year before. This was later simulated in dock-side tests on Thresher’s sister sub, Tinosa.During a test to simulate blowing ballast at or near test depth, ice formed on strainers installed in valves; the flow of air lasted only a few seconds.

We respect your privacy and will never share your email address with any person or organization. | {"cookieName":"wBounce","isAggressive":false,"isSitewide":true,"hesitation":"","openAnimation":"wobble","exitAnimation":false,"timer":"","sensitivity":"","cookieExpire":"15","cookieDomain":"","autoFire":"","isAnalyticsEnabled":false}We use cookies to ensure that we give you the best experience on our website. She was the U.S. Navy's second submarine to be named after the thresher shark. On April 10, 1963, the USS Thresher sank with 129 men on board, 250 miles off Cape Cod in the Wilkinson Deep. Without air-conditioning, temperature and humidity in the submarine rose, reaching 60 °C (140 °F) after about ten hours.The crew attempted to repair the diesel generator (four men would receive Navy Commendation Medals for their work that night).

On 10 April 1963, Thresher sank during deep-diving tests about 220 miles (350 km) east of Boston, Massachusetts, killing all 129 This caused an immediate reactor scram, resulting in a loss of propulsion.Thresher could not be deballasted because the ice had formed in the high-pressure air pipes, and so she sank.In addition to the SOSUS data that does not record any sound of flooding, the crew of Skylark did not report hearing any noise that sounded like flooding, and Skylark was able to communicate with Thresher, despite the fact that, at test depth, even a small leak would have produced a deafening roar.Additionally, the previous commander of Thresher testified that he would not have described flooding, even from a small-diameter pipe, as a “According to Rule, the SOSUS data indicates an implosion of Thresher at 09:18:24, at a depth of 2,400 feet (730 m), 400 feet (120 m) below her predicted collapse depth.The implosion took 0.1 seconds, too fast for the human nervous system to perceive.When the Court of Inquiry delivered its final report, it recommended that the Navy implement a more rigorous program of design review and safety inspections during construction.That program, launched in December 1963, was known as SUBSAFE.

The ship was finally re-certified and undocked on 8 April 1963.On 9 April 1963, Thresher, commanded by Lieutenant Commander John Wesley Harvey, got underway from Portsmouth at 08:00 and rendezvoused with the submarine rescue ship Skylark at 11:00 to begin her initial post-overhaul dive trials, in an area some 190 nautical miles (That afternoon Thresher conducted an initial trim dive test, surfaced and then performed a second dive to half test depth.She remained submerged overnight and re-established underwater communications with Skylark at 06:30 on 10 April to commence deep-dive trials.Following standard practice, Thresher slowly dove deeper as she traveled in circles under Skylark – to remain within communications distance – pausing every additional 100 feet (30 m) of depth to check the integrity of all systems.As Thresher neared her test depth, Skylark received garbled communications over underwater telephone indicating ” … By mid-afternoon, 15 Navy ships were en route to the search area.
Thresher painting, song recording and website created by Lori Arsenault, daughter in loving memory of Tilmon J. Arsenault Chief Engineman UNITED STATES NAVY USS Thresher, SSN 593 … After repairs at Groton, Connecticut, by the Electric Boat Company, Thresher went south for more tests and trials off Key West, Florida, then returned northward.The submarine entered Portsmouth Shipyard on 16 July 1962 to begin a scheduled 6-month post-shakedown availability to examine systems and make repairs and corrections as necessary.As is typical with a first-of-class boat, the work took longer than expected, lasting nearly 9 months. Even after isolating a short-circuit in the reactor controls, it would have taken nearly 10 minutes to restart the plant.The U.S. Navy has periodically monitored the environmental conditions of the site since the sinking and has reported the results in an annual public report on environmental monitoring for U.S. The crew eventually borrowed cables from another ship in the harbor and connected them to the adjacent Cavalla, which started her diesel and provided enough power to allow Thresher to restart her reactor.Thresher conducted further trials and fired test torpedoes before returning to Portsmouth on 29 November 1961. She returned briefly to New England waters, after which she proceeded to Florida for more SUBROC tests.While moored at Port Canaveral, Florida, the submarine was accidentally struck by a tug which damaged one of her ballast tanks. Air dryers were later retrofitted to the high-pressure air compressors, beginning with Tinosa, to permit the emergency blow system to operate properly.Such flooding would have been a significant sonic event, and no evidence of that can be found in the recorded data.Submarines typically rely on speed and deck angle (The normal procedure was to drive the submarine to periscope depth, raise the periscope to verify the area was clear, then blow the tanks and surface the submarine.At the time, reactor-plant operating procedures did not allow for a rapid reactor restart following a scram, or even the ability to use steam remaining in the secondary system to propel the submarine to the surface.After a scram, standard procedure was to isolate the main steam system, cutting off the flow of steam to the turbines providing propulsion and electricity. Reflecting on the situation in later life, McCoole was sure he would have delayed shutting the valves, thus allowing the boat to “answer bells” and drive itself to the surface, despite the flooding in the engineering spaces.Admiral Rickover later changed the procedure, creating the “In a dockside simulation of flooding in the engine room, held before Thresher sailed, it took the watch in charge 20 minutes to isolate a simulated leak in the auxiliary seawater system.Attest depth with the reactor shut down, Thresher would not have had 20 minutes to recover.