When Prien set out for his last patrol just nine members of the crew, and none of the original officers excluding Prien, were of the original compliment that went on the Scapa Flow mission. Fact is that crews were rotated and promoted out of boats so often, that frequently the crew were not built up to be elite in the way that we are able to do in SHIII. My personal feeling is that his boat was lost due to error, either due to something mundane or the combination of a green crew mean't that errors were made during a depth charge attack.
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