How Killer U-Boats Battled the Royal Navy | 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. Get More National Geographic: About National Geographic: National Geographic is the world's premium destination for critically acclaimed storytelling...

47 min - Oceans - National Geographic

More: Ocean Exploration documentaries

Read Deeper: Ocean Exploration

1. The Brilliant Abyss by Helen Scales - View on Amazon
2. Shadow Divers by Robert Kurson (3.9/5) - View on Amazon
3. The Sea Around Us by Rachel Carson - View on Amazon
4. The Outlaw Ocean by Ian Urbina - View on Amazon
5. The Silent World by Jacques Yves Cousteau - View on Amazon

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