UK scientists discover world's deepest sea vents

UK scientists exploring the ocean floor in the Caribbean have discovered an "astounding" set of hydrothermal vents, the deepest anywhere in the world.

Deploying a remotely-operated vehicle (ROV) in the Cayman Trough, they stumbled across a previously-unknown site nearly 5000m below the surface.

The vents blast out some of the hottest water on the planet - it is 400 degrees centigrade.

And they have found some unusual wildlife living alongside.

David Shukman reports.

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