@JCC USS Batfish sunk three Jap submarines in her career.
I was actually talking about U-BOAT sinking another sub... Should have stated that, sorry.
Correction: No u-boat has ever sunk enemy submarine, the occurrence I know about actually happened the other way around: U864 (type IXD2 ) was sunk by the British Submarine HMS Venturer on 9 Feb 1945 (the only known incident where one submerged submarine sank another submerged submarine).
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