[Retired COB]

BTW, Thresher sank because by procedure when the reactor scrammed, she could not restart it quickly. Without propulsion, she was not able to drive up to the surface. During the subsequent emergency blow, some of the emergency blow valves froze shut due to water in the lines. With no propulsion, and no way do increase buoyancy, Thresher sank.

This led directly to changes in reactor startup procedures, and brought the Sub-Safe system into being.

I've heard this one before. I also heard that we used to routinely allow our surface Destroyers to practice with live depth charges on our subs. One got too close and blew one of the hull valves. We no longer allow our DDs to practice on us with live ammo.

[rottndog]

First I’ve heard of that...

I do know that Thresher was in radio contact with the surface while she was having problems...which is why we were able to pinpoint what led to the sinking.