How Killer U-Boats Battled the Royal Navy (Full Episode) | Drain the Oceans

Draining the oceans reveals the story of the U-Boats as they took on the Royal Navy, sinking 12 million tons of ships and nearly winning the war.

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How Killer U-Boats Battled the Royal Navy (Full Episode) | Drain the Oceans
   • How Killer U-Boats Battled the Royal Navy ...  

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