I found out the hard way about crush depth especially when you have Hull damage. I about to attack a convoy and wanted to the thermal layer in the Carolina's but ended up crushing my sub.

I forgot about how hull damage was done when those dam destroyers ram ya. I think there should be an icon or something that tell you what percentage of your hull remains or what state it is in. I've checked my subsystems and all clear. What ya think?
I killed my crew at 120ft.