Inside one of the world's greatest natural wonders, a massive crystal cave characterized as Superman's fortress, with crystals up to 36 feet long and 55 tons. A team of experts enters the tunnel, experiencing temperatures that might kill a human in 15 minutes. They'll strain their bodies to the limit to find a chasm that may lead to another, more beautiful crystal cave.
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Inside one of the world's greatest natural wonders, a massive crystal cave characterized as Superman's fortress, with crystals up to 36 feet long and 55 tons. A team of experts enters the tunnel, experiencing temperatures that might kill a human in 15 minutes. They'll strain their bodies to the limit to find a chasm that may lead to another, more beautiful crystal cave.
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