I'll just address a couple of those questions as I've been testing the new sub damage models quite a bit.
1. Crush depth: Hang on--that's changing in the next version. I won't tell you deep I've been except to say while testing/tweaking the japanese sonar, I've been all the way to the bottom a couple times
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2. Radar Depth: Was 40-45 feet historically for using the SJ radar. They had to put the top of the shears out of the water to clear the antenna (sp?).
3. CO2 Levels: I always thought this was a bit generous--always seem to have plenty of air. But there were a couple actual cases where a boat was down for 30+ hours and while the air was bad (VERY bad) they were able to do it. I've never kept a boat down that long to test that setting though :hmm:.
4. Engine Sounds: Sorry--can't give you a good answer there. Maybe someone else will. Ditto for the torpedo question.
I've had a lot of fun testing some of the changes coming soon. The new damage models are--IMO--excellent.