Historically, 6% sounds extremely low, early war. The invasion of Norway, few, If any, torpedos were able to sink a target due to failures. Prien (Krestchmer? I forgot which one) had lined up over 100k tons of cruisers and troop transports, TIED TO DOCKS! He fired every eel and not one detonated. Multiple shots at capital ships (IIRC) were fired and missed, presumably due to duds.
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Luck is a residue of Design.
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