The restaurant at the bottom of the Mariana Trench.

Surprisingly, these primitive, single-celled organisms were twice as active at the bottom of the trench than they were at a nearby 6km-deep four miles site. They were feasting on a plentiful supply of dead plants and creatures that had drifted down from the sea surface, the decomposing matter becoming trapped within the steep walls of the trench. “The amount of food down there and also the relative freshness of the material is surprisingly high – it seems to be surprisingly nutritious,” said Dr Turnewitsch.

via BBC News – Mariana Trench: Deepest ocean teems with microbes.