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Amazing crystal caves

submitted by sepatown

1 decade 5 years ago

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.

from this show: http://www.bbc.co.uk/programmes/b00qbvyc