6. (end quote).

The ships rendezvoused the next morning just beyond the continental shelf for a deep-dive test, during which the Thresher sank. The CO of THRESHER, Wes Harvey, was a close friend and one of the most qualified nuclear engineers I ever had the honor to serve with. Because the USS SKYLARK (ASR-20) did not have the capability to record the underwater communications with THRESHER, the content of those communications was established by the Court of Inquiry (COI) through extensive, direct examination of those aboard SKYLARK who were present when the communications occurred. Alternating-current power was not lost, as the Gertrude was still working. Acoustic data rule out major flooding, but control-surface casualties were relatively common. Pate provided one set of the orifice plates and strainers to the court and retained the other. But it's still important for the families to have the documents, and some closure. Until communications were lost, they had been maintained with the Skylark through an underwater telephone system (Gertrude). (2) http://www.jag.navy.mil/library/investigations/USS%20THRESHER%20PT%201.pdf. The inquiry’s Finding of Fact 50 inaccurately describes its results: “Strainers in the reducers of Tinosa were blocked and ruptured by the formation of ice in about 30 seconds.” The Marotta Company manufactured the 4,500–3,000-pounds-per-square-inch (PSI) reducing valves used for ship’s service air, including MBT blow. By 0913 the Thresher had exceeded test depth, maybe by as much as 600 feet if the 0917 report, “900 North,” is interpreted as 900 feet below test depth or 2,200 feet—reasonable, given that the submarine was reporting depth relative to test depth.

This was probably a restart of the blow started at 0909.8. Rear Admiral Charles Curtze, a deputy commander at the Bureau of Ships, testified before a congressional hearing that the electro-hydraulic control valves and piping for ship control surfaces were under review because failures had caused submarines to take large trim angles and lose depth control. • 0913.5 to 0914: SOSUS and the Skylark detected a 30-second MBT blow. http://www.jag.navy.mil/library/jagman_investigations.htm scroll down the date and event columns to 1963/THRESHER, then click on each of the four documents listed as Parts I through IV. Ice forming on the strainers from adiabatic cooling from the Venturi effect blocked air flow until the ice melted or broke free, allowing reduced air flow until ice formed again. 14. The reactor operator shut main steam stop valves (MS-1 and 2) per the scram procedure, which secured steam supply to the main engines and SSTGs. A Naval Court of Inquiry investigated the submarine’s loss and concluded that the probable cause had been major flooding from ruptured 2–5-inch piping in the engine room.1 However, as shown by the evidence discussed here, this was probably not the underlying cause. Until a boat was SubSafe-certified, she was restricted to operating at half her test depth. Rule reported a LoFARGram showing a compartment flooding at great depth producing more than 100 individual strong narrowband resonances detectable from more than 700 nautical miles. If there was a silver lining, it was that the tragedy so shook the Navy that it accelerated safety improvements and created a program called SUBSAFE, an extensive series of design modifications, training and other improvements. On April 10, 1963, the USS Thresher sank with 129 men on board, 250 miles off Cape Cod in the Wilkinson Deep. “Have positive up angle” implies that the submarine had recovered from a down angle, possibly caused by a stern plane’s jam dive. Major flooding creates streams of high-velocity seawater striking the pressure hull and internal structures, producing broadband noise and narrowband resonances. Eventually, more than 1,000 pages of documents will be released. The Navy began releasing documents from the investigation into the deadliest submarine disaster in U.S. history this week, revealing that the ship's commanding officer noted a "dangerous condition" on the vessel before it was lost. Machinery sound dampening drastically reduced radiated noise, increased sonar detection capabilities, and reduced passive sonar counter- detection ranges, making the Thresher a real threat to Soviet submarines. In November 1963 ADM Rickover had me ordered to the Pentagon to OP 31. The first of the documents released were 300 pages from the official inquiry into the sinking of the USS Thresher in 1963.

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uss thresher implosion recording

(end quote) Additionally, there was no Sound Surveillance System (SOSUS) acoustic detection of THRESHER main propulsion activity nor was there any detection of a Doppler component that would have been produced by the such activity. (end quote).

Rickover rode the Thresher during the first deep dive after new construction and was concerned with flooding recovery at depth. VADM Dennis Wilkerson was my boss there. Live Updates: Trump holds last 2020 MAGA rally; Biden sweeps tiny N.H. town, U.S. braces for possible Election Day violence and unrest, Massive manhunt after Vienna terror attack leaves several dead, Potentially catastrophic Hurricane Eta just off Nicaragua, How Trump used COVID-19 to shut U.S. borders to migrant minors, Judge rejects attempt to block nearly 127,000 drive-thru votes in Texas, On election eve, U.S. My saddest memory was listening to the tapes of the underwater phone conversations between Wes and the submarine rescue vessel (1), which was his escort for his sea trials, after a major overhaul at Portsmouth Naval Shipyard. "All the events of that morning may never be known," Rather said. The loss of the nuclear-powered submarine and all 129 men aboard during a test dive in the Atlantic Ocean delivered a blow to national pride during the Cold War and became the impetus for safety improvements. A 2019 dedication of a new memorial at Arlington Memorial cemetery to the officers and crew of the USS Thresher, a nuclear submarine that sank in 1963, in Arlington, VA. Photo by Bill O'Leary/The Washington Post via Getty Images, deadliest submarine disaster in U.S. history, South Dakota attorney general "distracted" before deadly crash, Scientists capture two murder hornet queens after destroying nest, The Legacy of the Thresher - 1964 Dan Rather CBS SUBSAFE USS Thresher 41280 HD. Wes had relieved him as CO while the sub was in the shipyard.. (4) Calculations later estimated the sub reached 300-400 feet depth before the flooding stopped her ascent. This explains the intermittent interruptions during the Thresher’s MBT blow. Stern planes stuck in a dive position would require the Thresher to stop to prevent a large down angle and downward depth excursion. Sign up to get updates about new releases and event invitations. 87–88) and J. Bryant (8, p. 87).

6. (end quote).

The ships rendezvoused the next morning just beyond the continental shelf for a deep-dive test, during which the Thresher sank. The CO of THRESHER, Wes Harvey, was a close friend and one of the most qualified nuclear engineers I ever had the honor to serve with. Because the USS SKYLARK (ASR-20) did not have the capability to record the underwater communications with THRESHER, the content of those communications was established by the Court of Inquiry (COI) through extensive, direct examination of those aboard SKYLARK who were present when the communications occurred. Alternating-current power was not lost, as the Gertrude was still working. Acoustic data rule out major flooding, but control-surface casualties were relatively common. Pate provided one set of the orifice plates and strainers to the court and retained the other. But it's still important for the families to have the documents, and some closure. Until communications were lost, they had been maintained with the Skylark through an underwater telephone system (Gertrude). (2) http://www.jag.navy.mil/library/investigations/USS%20THRESHER%20PT%201.pdf. The inquiry’s Finding of Fact 50 inaccurately describes its results: “Strainers in the reducers of Tinosa were blocked and ruptured by the formation of ice in about 30 seconds.” The Marotta Company manufactured the 4,500–3,000-pounds-per-square-inch (PSI) reducing valves used for ship’s service air, including MBT blow. By 0913 the Thresher had exceeded test depth, maybe by as much as 600 feet if the 0917 report, “900 North,” is interpreted as 900 feet below test depth or 2,200 feet—reasonable, given that the submarine was reporting depth relative to test depth.

This was probably a restart of the blow started at 0909.8. Rear Admiral Charles Curtze, a deputy commander at the Bureau of Ships, testified before a congressional hearing that the electro-hydraulic control valves and piping for ship control surfaces were under review because failures had caused submarines to take large trim angles and lose depth control. • 0913.5 to 0914: SOSUS and the Skylark detected a 30-second MBT blow. http://www.jag.navy.mil/library/jagman_investigations.htm scroll down the date and event columns to 1963/THRESHER, then click on each of the four documents listed as Parts I through IV. Ice forming on the strainers from adiabatic cooling from the Venturi effect blocked air flow until the ice melted or broke free, allowing reduced air flow until ice formed again. 14. The reactor operator shut main steam stop valves (MS-1 and 2) per the scram procedure, which secured steam supply to the main engines and SSTGs. A Naval Court of Inquiry investigated the submarine’s loss and concluded that the probable cause had been major flooding from ruptured 2–5-inch piping in the engine room.1 However, as shown by the evidence discussed here, this was probably not the underlying cause. Until a boat was SubSafe-certified, she was restricted to operating at half her test depth. Rule reported a LoFARGram showing a compartment flooding at great depth producing more than 100 individual strong narrowband resonances detectable from more than 700 nautical miles. If there was a silver lining, it was that the tragedy so shook the Navy that it accelerated safety improvements and created a program called SUBSAFE, an extensive series of design modifications, training and other improvements. On April 10, 1963, the USS Thresher sank with 129 men on board, 250 miles off Cape Cod in the Wilkinson Deep. “Have positive up angle” implies that the submarine had recovered from a down angle, possibly caused by a stern plane’s jam dive. Major flooding creates streams of high-velocity seawater striking the pressure hull and internal structures, producing broadband noise and narrowband resonances. Eventually, more than 1,000 pages of documents will be released. The Navy began releasing documents from the investigation into the deadliest submarine disaster in U.S. history this week, revealing that the ship's commanding officer noted a "dangerous condition" on the vessel before it was lost. Machinery sound dampening drastically reduced radiated noise, increased sonar detection capabilities, and reduced passive sonar counter- detection ranges, making the Thresher a real threat to Soviet submarines. In November 1963 ADM Rickover had me ordered to the Pentagon to OP 31. The first of the documents released were 300 pages from the official inquiry into the sinking of the USS Thresher in 1963.

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