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In 1866, Cyrus W. Field finished laying out the first successful underwater telegraph cable between North America and Europe (a previous cable…

On June 4, 1944, U.S. forces were able to capture a German submarine off the African coast because they had broken the Enigma code and learned a sub was in the vicinity. On the eve of D-Day, the U.S. couldn’t risk that the Germans would realize the code was cracked. So they hid away the sub and its captured crew until the end of the war, and the Germans assumed the vessel was lost at sea.