The National Geographic Channel takes viewers inside 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 team of experts ventures into the tunnel, where they must contend with blistering temperatures that may kill a human after only 15 minutes of exposure to them. Their physical limitations will be tested when they investigate a chasm that could bring them to another - and probably more beautiful - crystal cave.
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The National Geographic Channel takes viewers inside 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 team of experts ventures into the tunnel, where they must contend with blistering temperatures that may kill a human after only 15 minutes of exposure to them. Their physical limitations will be tested when they investigate a chasm that could bring them to another - and probably more beautiful - crystal cave.
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