A sub trying to repair is a valid target. I don't know how modern torps practice bottom detection in the real world (or if they can.) In the game 3D env, you can "see" the 3D sub and steer accordingly. In the real world, there are no cinematic cameras positioned around the battle space. The real world commander would not know what caused the torp to explode and would only know it missed or hit by resultant sensor data.
-Pv-
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