The submersible Alvin investigates the Cayman Trough, a transform boundary on the floor of the western Caribbean Sea.

阿尔文潜水器研究开曼群岛海槽，这是西部加勒比海底面上的转换边界。

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These islands are actually the peaks of the Cayman Trough, the Caribbean Sea's deepest trench.

这些岛屿实际上是开曼槽的顶端——加勒比海最深的海沟。

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

BBC: Deepest undersea vents discovered by UK team

But it was only three years ago that vents were first detected in the Cayman Trough, a deep trench formed by the boundary between two tectonic plates.

BBC: Deepest undersea vents discovered by UK team

Now back on dry land after broadcasting on the latest work on the research ship James Cook in the Cayman Trough, I'm still picking up messages from people amazed at getting such an extraordinary vision of the reality of the deep sea.

BBC: A deep sea mission of genuine exploration