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Hranice Abyss: The deepest freshwater cave on Earth and a conduit to a 'fossil' sinkhole

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76% Informative

The Hranice Abyss , or " Hranická propast," is the deepest known freshwater cave in the world.

Geologists think it could extend more than half a mile ( 1 kilometer ) below Earth 's surface.

It is more than twice as deep as the world's next-deepest freshwater cave.