In the Mariana Trench, 8 kilometres beneath the surface of the ocean, we find the deepest living fish in the oceans. Pale, slimy and resembling half-metre-long tadpoles, these remarkable creatures are Mariana Snailfish. The immense pressure found at these depths is 1,000 times greater than at sea-level, so to survive, they have developed soft, gooey bodies which seem to melt apart when specimens are brought to the surface. But down in the trenches, they’re incredibly efficient, and have even become top predators, preying on crustacean scavengers that in turn feed on decaying carrion.