deafferret finished reading Shadow Divers by Robert Kurson
Great read, provides a lot more detail than the various YouTube summary videos you can find. (The YTs are neat too -- to actually see the faces actually doing the thing, and videos from the sub.) I ended up largely skipping the chapters from the German perspective since I can only fit one set of people in my brain at a time. I'm familiar with similar material.
It's fascinating to read the emotions, thought processes of the various people as they determine to dedicate huge chunks of their lives to this singular obsession. I know divers like that. Seeing my friends reflected in this specific epic tale made for a great read.
Having dove my grandfather's WWII ship makes reading about other grave site scuba especially poignant for me. usshoustondive.com/divers/jay_hannah/