Excellent info Herr von Mumit
one minor quibble:
why call it spoiler info? I'm sure every Kaleun who took a boat out to sea knew exactly how long it would take for his crew and Uboat type to crahsdive, this is something that was excercised constantly I'd imagine, and done over and over again until they got it right, the lives of the entire crew depend on it after all so you'd want this to be done as fast as possible.
I wouldn't be surprised if there was such a thing as the unofficial title of "fastest diver in the Kriegsmarine"
