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File:WW2 German Navy U-boat submarines (Kriegsmarine Unterseeboote U-boote) etc wartime contemporary photo U-256 19.jpg - Wikimedia Commons
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Russian diesel-electric submarine B-143 / U-480 Foxtrot type 641 at the Seafront Maritime Theme Park in Zeebrugge, Belgium Stock Photo - Alamy
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U-Boat 480: The Hunt For Nazi Germany's Rubber Stealth Submarine | Deep Wreck Mysteries | Timeline - YouTube
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On this day in 1942: A 16-year-old British sailor salvaged the Enigma codebook from a sinking U-Boat
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