Acorn worms like this one could hold the key to one of evolution’s unsolved puzzles (Image: University of Aberdeen)
An expedition led by the dived down to the mid-Atlantic Ridge, the vast mountain range running down the centre of the Atlantic. They found a host of new species, and discovered that many supposedly rare species were living in great numbers. Find out about them in our gallery.
Gallery: Secrets of backboned life found on undersea mountains
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