Nat.Geo. - Drain the Oceans Series 2 (2019) Part 3 Killer U Boatsy

Drain the Oceans Series 2

Pull the plug on the ocean to reveal hidden secrets using groundbreaking technology, breathtaking photography and insight from top archaeologists.

Part 3 Killer U Boatsy

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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