Movile Cave has been cut off for millions of years. Its air is thick with harmful gasses, yet it is home to an array of strange beings.
The cave remained unopened for 5.5 MILLION years. It was discovered in 1986 a few kilometers from the Black Sea coast. The air inside the cave is very different from the outer atmosphere. The level of oxygen is only a third to half of the concentration found in open air.
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source : www.bbc.com
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