In reality, the submarine U-571 was never captured. The submarines U-559 and U-110 were the ones captured with the codebooks, but by the British Navy in August 1941, four months before the United States entered the war. U-570 however was a U-boat captured in late 1941 (by Britain) near Iceland, and subsequently deployed as H.M.S. Graph until early 1944. Its appearance was used by the Royal Navy to fool German ships and submarines, and destroy them by surprise.

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