Im not sure if it was depth charges or hedge hogs that got me (no external view).
I was evading several depth charge attacks and for a while they started going after the decoys while i slipped away from the convoy. however, somehow they regained contact with my boat. The first time this was made apparent to me was when i started hearing pings suddenly spaced at about half second intervals.
but whatever cause the damage - the boat was damaged at 240 meters. The resulting loss in hull integrety only served to increase the rate at which the boat took damage from sea pressure. I was left with only two alternatives... allow the boat to implode - or give it up.
i chose the route that would likely cost less of the sailors their lives.