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Into the Lost Crystal Caves

NGC visits one of the world's greatest natural wonders, a massive crystal cave known as Superman's stronghold, which has stunning crystals up to 36 feet long and weighing 55 tons. A group of scientists braves the cavern's sweltering temperatures, which could kill a human in just 15 minutes. They'll test their physical limits in order to explore a chasm that could lead to another, possibly more beautiful crystal cave.

Released: 2010-10-09

Genre: Documentary

Casts: Robin Ward,

Duration: N/A min

Country: Canada

Production: National Geographic