National Geographic Channel (US)
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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 (Source: nationalgeographic.com)
TV Show Canceled/Ended.
S1E1 - Into the Lost Crystal Caves
Air Date: 10 Oct 2010 12:00 (CDT)