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.