A population of microbes that are tens of thousands of years old has been discovered in a place called Hell.
The extraordinary micro-organisms were found trapped in crystal in a volcanically heated Mexican cave system where temperatures reach 60C (140F).
Some of them are believed to have been there for 60,000 years and were shut off from light or oxygen and obtained energy from minerals.
Scientists have been unable to classify 90% of the bugs, which could not be matched with any other micro-organisms catalogued in available databases.
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