Only de-ballasting by blowing MBTs and pumping variable ballast tanks to sea would enable ascent. Postal Service faces delivery delays, U.S. battles coronavirus surge as states see record new cases, CBS News coverage of voting rights issues. (6) Calculations show she was going over 100 knots when she bottomed. The documents released Wednesday included the timeline of the sinking, evidence lists, reports, testimony and correspondence. The hull collapsed in 47 milliseconds (~1/20th of a second), too fast to be cognitively recognized by those on board.16. © 2020 CBS Interactive Inc. All Rights Reserved. Stern planes stuck in a dive position would require the Thresher to stop to prevent a large down angle and downward depth excursion. The final ten minutes of the Thresher are detailed in the March 2018 Proceedings (p. 87).
Like radar at the start of World War II, SOSUS data were not fully trusted or used in the investigation. Statements in the THRESHER BOOKLET by CAPT Zeb Alford (1925-2009) are provided below in full. I could hear the air blow start and the screw speeding up. Pate reported that conical strainers and orifice plates were installed upstream of these reducers, and that the strainers were collapsed, not ruptured, as shown in this photo that he took. (2), His voice was calm and easily recognized. The brazed joints in pipes were a special concern, and many electrical panels were not adequately protected from sea water in the event of a leak, the report said. Retired Capt. Much of the acoustic information derived from analysis of the LOFARgram displays by the writer, and provided to the THRESHER COI in closed testimony on 18 April 1963 is contained in COI OPINION 46 in http://www.jag.navy.mil/library/investigations/USS%20THRESHER%20PT%202.pdf, (5) There is no discussion in any COI document of calculations that indicated THRESHER (quote) reached a depth of 300-400 feet before the flooding stopped her ascent. His suspicion is that the Navy was pushing the limits and placing personnel at risk during the Cold War. The next thing on the tape some minutes later was the collapse of the first bulkhead, followed shortly after with the others collapsing. If variable ballast was not pumped to sea to compensate, and with normal increases in weight, such as sanitary tanks filling, the Thresher might have reached test depth at least 12,000 pounds heavy. Philip Martin Callaghan, “Effects of the USS Thresher Disaster upon Submarine Safety and Deep-Submergence Capabilities in the United States Navy,” MA thesis, Virginia Polytechnic Institute and State University, Blacksburg, VA (1987), 11. (4) Calculations later estimated the sub reached 300-400 feet depth before the flooding stopped her ascent. Note: the depth value (2400 feet) and energy yield (22,500 pounds of TNT) of the THRESHER collapse event were derived using the empiric relationship between the volume of a collapsing structure and the bubble-pulse frequency discussed on page 134 of the WINTER 2012 issue of THE SUBMARINE REVIEW. I couldn�t believe the message we received.
Naval Institute Essay Contests, Since SOSUS did not detect blade rate (screw rpm), the, Rule’s analysis of LoFARGrams from SOSUS stations as remote as Argentia, Newfoundland, and Antigua, British West Indies, produced a time-difference fix on where the. The first nuclear-powered submarines, slow and radiating excessive noise, retained the traditional diesel-electric hull design. The cumulative effect of multiple leaks could have exceeded the capacity to deballast by pumping to sea or blowing MBTs. She was the U.S. Navy's second submarine to be named after the thresher shark. 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. 87–88) and J. Bryant (8, p. 87). After leaving the Navy in September 1963, Rule spent the next 42 years as the lead acoustic analyst for the Office of Naval Intelligence.3 Key information from Rule’s LoFARGram analysis that was redacted from the released portions of the inquiry’s report includes the following points: The Naval Court of Inquiry justified its finding of major flooding by citing a then-recent history of silver-brazed pipe joint failures on six submarines, including the Thresher. The crew indicated it was attempting to empty ballast tanks in an effort to surface. Those statements of special interest are foot-noted (1) through (8) with references to Navy Judge Advocate General THRESHER Court of Inquiry documents that provide information related to those statements. What happens if the president doesn't accept the election results? Acoustic data provided by the writer to ONI in October 2009 indicates the average sink-rate of the USS SCORPION (SSN-589) hull sections was less than 28 knots. The crew of an accompanying rescue ship heard something about the "test depth." Bryant said the Thresher's final descent and implosion was recorded on paper time-frequency plots in great detail by the Navy's underwater Sound Surveillance System (SOSUS). Acoustic data rule out major flooding, but control-surface casualties were relatively common. Stanford Libraries, “Loss of the USS Thresher,” 85, 86. Commissioned 3 August 1961, the Thresher featured 22 percent more displacement and a beam two feet wider than the Skipjack’s. Opinions of the Naval Court of Inquiry (NCoI), section 4, 13.
“Have positive up angle” implies that the submarine had recovered from a down angle, possibly caused by a stern plane’s jam dive. Recent Proceedings articles pertaining to this subject include most saliently Captain Joseph F. Yurso, USN (Ret. The USS Thresher (SSN-593) was launched at Portsmouth Naval Shipyard 9 July 1960. "All the events of that morning may never be known," Rather said. Michael Shafer, whose father and uncle both died on the Thresher, said some of the families need to review the documents to see for themselves and fully understand what happened. • 0911: SOSUS detected MCPs stopping, causing a reactor scram. Until communications were lost, they had been maintained with the Skylark through an underwater telephone system (Gertrude). Alternating-current power was not lost, as the Gertrude was still working. View the original post on the IUSSCAA message board here, http://www.bonefishbase.org/wp-content/uploads/2011/10/Thresher-Booklet.pdf, http://www.jag.navy.mil/library/jagman_investigations.htm, http://www.jag.navy.mil/library/investigations/USS%20THRESHER%20PT%203.pdf, http://www.jag.navy.mil/library/investigations/USS%20THRESHER%20PT%201.pdf, http://www.jag.navy.mil/library/investigations/USS%20THRESHER%20PT%202.pdf. Lessons were learned and improvements made—but the Navy has yet to declassify important documents on the loss of the world’s most advanced submarine. if you have difficulty accessing the websites provided below, go to the Navy JAG site: She was to lurk silently in the deeps until she came to a shipping lane or some port, waiting for an enemy sub. The airflow stopped and restarted sporadically every few seconds for six minutes, until the test was stopped.11 Ruptured strainers would be less restrictive than collapsed strainers, and orifice plates (not mentioned in the Naval Court of Inquiry’s report) significantly restricted air flow to the MBTs. 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. Marotta provided the orifice plates and strainers, and PNSY installed them, without anyone on the Thresher or the Tinosa knowing that to prevent construction debris from damaging the reducing valves, they should have been removed when the work was completed. It is time for the Navy to fully share all the evidence pertaining to this historic watershed naval loss. The loss of this advanced sub was an avoidable tragedy. At that time, they did not have recorders. Lessons were learned and improvements made—but the Navy has yet to declassify important documents on the loss of the world’s most advanced submarine. Bryant and Evans have an unsigned copy that was verified by telephone with Pate. (8) I could read the name of the next to last reactor watch officer on the log sheet on the bottom of the ocean from the hundreds of pictures taken. Underwater photograph shows a portion of the sunken nuclear-powered submarine 'USS Thresher,' September 1963. On 9 April 1963, the Thresher departed for post-PSA sea trials in tactical command of, and escorted by, the submarine rescue vessel USS Skylark (ASR-20).
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