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[–] 1 point 5 hours ago (1 child)

Since the gun could only be loaded while the sub was surfaced, it had to sink its target in one shot, which was unlikely to be the case against warships, even something small and unarmored like a destroyer.

https://en.wikipedia.org/wiki/HMS_M1_(1917)

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  • [–] 1 point 4 hours ago

    Good luck managing to hit a destroyer with a fixed gun.

    I would imagine that if you did manage a hit though, it would be devastating. I don't think there were many ships that could shrug off hits from a 12 inch gun. Even if it didn't sink, it would probably be badly damaged, which might give the sub the opportunity to surface somewhere safe, reload, and shoot again.

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