In my pregnant sea cow (IXD2), I was attacking a convoy Northeast of Madagascar, got jumped by a random escort so I dived down to 180 M.
THey had sonar contact on me for 23 hours in game, and had flooding at least once in every compartment. Escorts lost contact when I was flooding down to 250 M and dropped all my sonar decoys. One diesel was out completely, the other deisel could only manage 4 Kts at any speed, diesel reserves down to 20%, both electrics down, 1 propellor shaft dead, all torpedo tubes dead, all batteries destroyed (of course) watch tower extremely heavily damaged (still able to be manned) all radar apparatus and sonar apparatus destroyed. Deck and flak guns destroyed. when I got back to Penang, and exited SH 3, SH3 Commander showed my H.I. was down to 9%. Guess I got lucky. Made it back with about 9 KM left of fuel


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