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 weighing 55 tons, NGC Inside the tunnel, a team of professionals brave temperatures that might kill a person in 15 minutes. They'll test their physical limits to investigate 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 weighing 55 tons, NGC Inside the tunnel, a team of professionals brave temperatures that might kill a person in 15 minutes. They'll test their physical limits to investigate a chasm that may lead to another, more beautiful crystal cave.
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