Everything we've been told about how the Thresher was lost was a lie.

[WarPig1976]

Information declassified and released yesterday.

Information

Warning: This is a relatively older thread This discussion is older than 360 days. Some information contained in it may no longer be current.

[Bob Womack]

I remember that casualty and the mourning afterwards. It is sad to find that the casualty lasted for over twenty-four hours. It reminds me of the Challenger disaster, where they kept silent the fact that the crew were alive until they hit the water. A friend was on the ship that recovered the flight deck of Challenger so I knew within weeks, but they kept it silent to prevent further grief to the families.

Bob

[Lee Enfield]

There was nothing to be gained by telling the truth.

Unfortunately there was nothing they could have done to rescue the crew at the time.

It explains the impetus to develop the air mobile DSRV Mystic-class deep-submergence rescue vehicle - Wikipedia

A mechanically crippled sub drifting...the crew desperately try to save themselves and waiting for the end for at least 2 days, just above crush depth could possibly have been saved with such a system...

the thing that struck me (and the narrator obliquely refers to it), it sounds like running the main sonar on the Thresher (in the attempted communication) probably merely hastened the end by exhausting the remaining battery power.

ETA: knowing (actually) very little, but always having been interested in Subs (well before Red October)...
Listening to the description of the sonar contacts (a pinnacle) and the emergency sonar transmitters (one muffled, one clear), reminded me that the last communication was that Thresher was experiencing severe trim keeping issues and were going to blow main ballast.

I suspect that the boat was either severely nose up or nose down, to be nearly vertical, blowing the main ballast just allowed the air to escape.