Thirty metres beneath the surface of southern Romania there is a secret crypt known as Movile cave that has been locked away from the rest of the Earth for millions of years. The shrimp-like crustaceans and spiders that live in its dark, damp recesses may resemble their cousins outside the cave, but their ecosystem is built on entirely different foundations. While most life relies in some way on the sun's energy, the animals in Movile cave are almost completely locked away from its influence. Not only do they live in pitch blackness, but virtually none of the nutrients created on the surface filter through the rocks into the cave.
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