0.0.23 patched game defeated me for the first time. April 3rd, Narvik approach area, allied convoy moving East, destroyer as leader, at least 3 destroyers on port. After I attacked they dropped some "random" DCs but as I submerged and maneuvered immediately after launch they never really found me. But here they got tricky - the convoy moved on and my sonarman (who is totaly deaf) reported no contacts nearby, so I risked an early periscope check. I got pinged and DCd before reaching 20 m, so dived again. Some more DCs were dropped, closer and closer, then I realised I was too deep and my boat is slowly falling down if I don't speed a bit - I suppose that was the main mistake here, as the DCs dropped even closer this time. Finally hull got crushed at more than 200 m depth (as my UI says, we were below crAsh depth...).
So, this was definitely an improvement compared to earlier version I had (North Atlantic 2 convoy battles).
EDIT: Photo documentation found when... seas dried to the bottom: