Found in 2 comments on Hacker News
mikeleung · 2017-07-18
· Original
thread
I would also add shadow divers: https://www.amazon.com/Shadow-Divers-Adventure-Americans-Eve...
epmatsw · 2014-10-22
· Original
thread
Shadow Divers is an excellent book about finding sunken U-Boats in the Atlantic as well. Highly recommend.
http://www.amazon.com/Shadow-Divers-Adventure-Americans-Ever...
