What Prien accomplished was a terrific feat of daring, especially when you take into account the torpedo difficulties he encountered. That he lived to return to base is partly fortune, partly the skill of a courageous Kaleun and partly due to British laxity early war with respect to their security measures. Sadly, the game makes port raiding too easy, wherea feats like Prien were very few and far between. I am not aware if any U-boats ever repeated Prien's success.
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