I will have to look up the incident specifically but as I recall some of our RCN guys in WWII did something kind of similar. They were low on DCs and they had a Uboat pinned so they dragged a DC on a chain with some kind of contact detonator if I recall correct. As far as I remember it worked and after detonation they had debris coming up to the surface. I will have to go through my books to find the exact incident.
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