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. National Geographic is the world's premium destination for critically acclaimed storytelling around science and exploration. Discover amazing wildlife, ancient civilizations, hidden worlds, and the incredible wonders of our Earth.

Courtesy of National Geographic on YouTube. Watch on YouTube ↗

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