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Into the Lost Crystal Caves

6.7 N/A min

NGC goes inside one of the greatest natural marvels on the planet - a giant crystal cave described as Superman's fortress, with magnificent crystals up to 36 feet long and weighing 55 tons. A team of experts venture into the cavern, enduring scorching-hot temperatures that could kill a human after just 15 minutes of exposure. They'll push the boundaries of physical limitation to explore a crevasse that could lead to another - and perhaps more spectacular - crystal cave.

Country: Canada

Genre: Documentary

Released: 2010-10-09

Production: National Geographic

Casts: Robin Ward,

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