Lance,
The fact that your Grandfather told the story makes it that much more impressive.

The idea of being stuck at that depth for that long... it seems a simple problem, but terrifying on further consideration.
As far as the further orders...[shudder]...
Just finished following another rabbit hole - this time in the form of CDR Duff's "Medical Study of the Experiences of Submariners as Recorded in 1,471 Submarine Patrol Reports in World War II", and the following came to light again:
"The third patrol of the PAMPANITO was 'marked by outstanding resourcefulness and ingenuity in the repair of a serious leak in the forward trim tank. One officer and man volunteered to go down in the forward trim tank during a dive to locate the leak.' 'The manhole cover didn't leak and we knew we could supply an ample amount of air with the 225 pound blower. Arranged a set of signals and pumped dry for a test. Manhole cover was removed and the men were put inside and the cover replaced. Removed the manhole cover from the after part of the forward trim tank in the forward torpedo room and attempted voice communication with the forward part of the trim tank. Dived slowly, 'A few very tense moments passed while we waited for word from the men in the tank: finally at 60 feet voice communication was established--."
It is only a fraction of the larger story. In "Steel Shark in the Pacific", CPT Jaffee elaborates further - the Pampanito went to 200' with these men in tank. For me, while this is not bravery in direct contact with enemy warships, this is an example of the struggle against the most vicious enemy for all who sail - the ocean itself. It is also telling of the dedication the crews back then... all they really wanted to do is sink ships. It wasn't about "glory" in the "pending-book-and-movie-rights" sense that the current trend of motivation this generation seems to readily embrace, but the satisfaction of a job accomplished and a job well done.
(Rich - if you are reading this and if you are the one responsible for uploading the Duff report, much thanks. My wife, she's not too thrilled with me being sucked into two nights' reading, but I have more resources for further essays

)