The Movile Cave in Romania, just a few miles west from the Black Sea, has been sealed up for around 5.5 million years. Although the air in it is poisonous and unbearably humid, scientists have so far identified 48 species – 33 of which are totally unique to this one cave. Jeff and Anthony discuss the lost world of this cave, what it means, and whether they would delve into such a deep, harsh place.

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Today’s story was sent in by Brandt Hughes: http://www.bbc.com/earth/story/20150904-the-bizarre-beasts-living-in-romanias-poison-cave

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