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Amazing Crystal Cave - How Earth Made Us - S1 Ep1 Preview - BBC Two

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Published on Jan 12, 2010

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http://www.bbc.co.uk/programmes/b00qbvyc

In this first episode Iain explores the relationship between the deep Earth and the development of human civilisation. He visits an extraordinary crystal cave in Mexico, drops down a hole in the Iranian desert and crawls through seven-thousand-year-old tunnels in Israel.

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