This reminds me of the U-Boat off of New Jersey that took a long time to learn the name. Germans thought it went down off of Gibraltar rather than NJ. Was the subject of a book called, “The Last Dive” where a father and son died. John Chatterton finally unlocked the secret and visited a sister in NJ of one of the lost sailors. She cried when she learned he was lost only a short distance from her home.
Shadow Divers. GREAT book, makes you realize just how crazy those guys were. Insanely dangerous stuff.
They would expect to get nitrogen narcosis, and...just deal with it. If the valve on a pipe turned into a leprechaun with fins and spoke to them, they would just shrug it off, while the hum in their heads got louder and louder.
Absolutely insane. And the bends....