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Player vs. Player you could do that, the AI subs in the game can only use their deckgun, they also don´t dive.
The thing is, WW2 subs were never made for this role. There were only a few cases in WW2 and then it was a surface engagement where a spread of torpedos was fired against a surfaced enemy sub.
The biggest problem is that torpedos are not guided (except for late-war acoustic torpedos). A sub-surface engagement is extremely difficult. The easiest part would be to detect the enemy by Hydrophone, the difficult part is to actually hit it. That would be pure luck.
Then there is the technical limitation that you can´t tell the torpedo to run deeper than 25m. That "problem" hasn´t been solved yet.
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