Drain the Oceans explores one of the world's great mysteries - the identity of the Loch Ness Monster. Scotland's dramatic landscape is made up of some of the oldest rock layers in the world, and embedded in them are thousands of extraordinary dinosaur fossils. But the question today is: Do any sea monsters still exist in the Scottish islands?

Combining military-grade scanning technology and a sonar curtain drawn across its entire surface, the plug is pulled on Scotland's famous loch. As the waters drain away, much more than a monster is revealed.

Drain the Oceans on National Geographic UK 📺
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