Don't worry about accidental torpedo launches, it happened to the real U-boat crew too. On one occasion (I believe it was the U-99 commanded by Otto Kretschmer) a torpedoman lost his balance and fell on the release handle resulting into a launch. Kretschmer (who was known to lose his temper quite quickly when confronted with what he called incompetence) was furious at first untill he noticed that this accidental torpedo had actually hit a ship inside the convoy. Speaking of luck.
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