A giant underground river fed by melting ice could be running in a state of perpetual darkness far below the surface of Greenland.
Source: https://www.livescience.com/dark-river-under-greenland.html
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A giant underground river fed by melting ice could be running in a state of perpetual darkness far below the surface of Greenland.
Source: https://www.livescience.com/dark-river-under-greenland.html