Lake Vostok in Antarctica isn’t like most of the world’s other lakes. You can’t see it from surface level, because it’s been buried under two miles of ice for the past 15 million years. And unlike other bodies of water that recycle their contents fairly quickly, the water in Lake Vostok only recycles about once every 13,000 years from some unknown source. It’s under too much pressure from all the ice above it to freeze, but it can’t easily escape either, and it’s uncontaminated by human activity or chemicals.
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