A hairy crab named after David Hasselhoff hitched a ride on an ocean "super-highway" to cross from the Pacific to the Atlantic millions of years ago.
The crabs reproduce by releasing many larvae into the water so that a handful reach other vents and colonise them.
But it is thought that they survive for only a short time in open waters; so a strong west-to-east current around Antarctica may have aided their spread.
The animal was discovered in 2011.
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