The rescued men were searched, and any documents deemed to be of interest seized. Macintyre’s crew found newspaper and magazine clippings lauding the exploits of the U-boats, which one article termed ‘Sea Wolves’. A sketched drawing was taken from another man. This document was of a different category to the clippings. It showed the crude outline of a convoy with a U-boat attacking from within the columns, a hand-drawn illustration of the tactic that had sent so many people, and hundreds of thousands of tons of food and supplies, to the ocean bed. Here, depicted in a few lines, was the secret
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