In this video, NGC goes inside one of the world's greatest natural wonders: a huge crystal cave that's been likened to Superman's fortress, with crystals that can be 36 feet long and weigh 55 tons. A group of experts go into the cavern and have to deal with temperatures that could kill a person in just 15 minutes of exposure. Physically, they'll go over their limits to explore a crevasse that could lead to another crystal cave, which could be even better than the first one.
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In this video, NGC goes inside one of the world's greatest natural wonders: a huge crystal cave that's been likened to Superman's fortress, with crystals that can be 36 feet long and weigh 55 tons. A group of experts go into the cavern and have to deal with temperatures that could kill a person in just 15 minutes of exposure. Physically, they'll go over their limits to explore a crevasse that could lead to another crystal cave, which could be even better than the first one.
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