USS Thresher (SSN 593) sank 55 years ago. Apparently the Navy has not been forthcoming about the reasons for her loss. You can read about it here:
https://www.military.com/daily-news/2018/04/09/55-years-after-thresher-disaster-navy-still-keeps-secrets-sub-loss.html
I'd like to add something to the mystery:
In a former life, I served on USS Nautilus (SSN 571) and was on her decommissioning crew (l was her final MPA). I can recall taking a "sound silencing and vibration" course in the late 1970s that included video of a submarine which was fitted with shock analyzing equipment and which then was depth-charged to determine how much damage such shocks would cause. The sub was USS Thresher (SSN 593). After seeing that video, I have always felt Thresher's demise had something to do with those depth charges and whatever lingering damage they may have caused. Yet I have never seen any mention of this in previous studies and reports.
I have been in a situation which may have been similar to what happened to Thresher. We ran a drill which included a reactor scram, lost propulsion, and then found ourselves sinking with significant negative buoyancy (our bilges were always full). Fortunately we were able to recover using a normal blow of MBTs, something Thresher apparently could not do. Still gives me the willies to think about it.
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