When we lost the Thresher off the coast of Maine. Subsafe and Level One quality control protocol was born. Also our boats left the shipyard for shake down cruises without shipyard personnel aboard. That changed. Admiral Rickover considered every boat to be his personal property right down to our training prototypes. He came to ours in Idaho one time. He was a little white haired guy with full bird captains running to get coffee for him. He terrified our Westinghouse Civilian overseers. We never lost another boat out of the yards. Don’t start the USS Scorpion stuff. The boat sailors of that period have our own picture of what that event was. I don’t know what that old boy had on everyone in DC but he got what ever he wanted. We all figured it was Admiral Rickover’s sub fleet and if God went on vacation, he would stand in for him.
John W. “Bill” Sheehan, Captain, USN (Ret.) - Recollections of Encounters with Admiral Rickover
https://ussrickover.org/rcl-john-sheehan/