"If it imploded, that means they collapsed inward. Polmar points to the recordings from the Navy's underwater Sound Surveillance System, or SOSUS, as key evidence in forming his opinion. "I don't believe it," Polmar flatly told in an interview. Norman Polmar, an author and naval analyst who wrote the book "Death of the USS Thresher," discounts the possibility that what the Seawolf heard was surviving sailors in a still intact Thresher. Unbeknownst to the Seawolf at the time, every major investigation has concluded that, by the time it began its first dive search, the Thresher had already been crushed by the ocean pressure after sinking to 2,400 feet - 400 feet past what its hull could take. The log also notes that what the sailors were hearing "could be sounds from in vicinity." In between requests to "bang 5 times on hull," the submarine reported hearing more bangs, but a later entry conceded "he does not give us number asked for." On one dive, the Seawolf reported metal on metal banging heard on sonar. They asked for a repeat of the message, but one was never received. The Seawolf also reported sailors "may hear very weak voice" over their underwater receivers. Read Next: Army Lieutenant General Gets Fourth Star and Becomes Second Female Combatant Commander in HistoryĪbout halfway through its search, the submarine reported a "total of 37 pings heard counted." If you will send 5 dashes we will have positive Identification - send 5 dashes." There is no report of five dashes being received, but the Seawolf continued to try to get a fix on the source of the pings. The declassified log shows that, over a series of four dives, the submarine reported hearing various pings and sounds it thought might be the missing Thresher.Īt one point, the Seawolf broadcast: "We hear your underwater telephone. The new documents show that the Seawolf arrived in the area the Thresher was believed to have sunk on the morning of April 11, 1963, just over 24 hours after the sub disappeared.
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