[CCIP]

But flooding isn't tied to hull integrity, is it?

I'd like to see more reports on this. I realize "Das Boot" isn't exactly a source for realism, but I'm sure there's other sources to look at. I'd like to know more about it myself. My initial suspicion, however, is that a hull breach isn't neccesarily a must for leaks to occur. Surely there's a lot of ways a water can come in - heck, in early war, even the diesel exhausts would routinely leak when the boat was submerged.