Proper pre-war/early war doctrine would be for you to dive deep, and conduct an attack by hydrophone. Do not risk your boat. Do not risk your crew. Do not get detected.
But if you want to throw out the book and sink ships, I'd suggest a submerged daytime attack. Do what you must to get in, sink the targets, and get out to do it again.
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"Never ask a World War II history buff for a 'final solution' to your problem!"
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