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Cave explorer Andrew Eavis

The British cave explorer Andrew Eavis is said to have discovered more territory on earth than anyone else alive - all of it underground. Now in his sixties, he's just spent a month in Borneo exploring one of the world's biggest underground chambers - it's all part of his continuing efforts to map caves around the globe.

Picture: Andrew Eavis and a colleague look up at a large rock formation in the middle of a cave in Guilin, China

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17 minutes