there were 22 U-Boats sunk by allied subs.
20 of those were from torpedo impacts
1 was from a submarine laid mine
1 was from a combination of factors which an allied sub received partial credit.
presumably all of the attacking allied subs were submerged when the torpedoes were fired.
given the locations of the attacks... i would guess that about 50% of the sinkings took place because allied subs were submerged patrolling the waters outside of known German U-boat bases.
the other 50% were probably unluckily caught on the surface while in transit.
i would say that a realistic career in SH5 might see the skipper encountering one or two attack attempts by allies subs.
EDIT:
I agree this would be a neat fluke thing to see in game... and the pucker factor would be major.
however from a historical standpoint... Sub Vs. Sub action only accounted for about 2% of total U-Boat losses
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