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![Into the Lost Crystal Caves Into the Lost Crystal Caves](https://img.seriesonline.la/xxrz/250x400/781/7a/15/7a15c0a887c15e3ecf5dab661d189bfb/7a15c0a887c15e3ecf5dab661d189bfb.jpg)
Into the Lost Crystal Caves
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.