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.
- Year : 2010
- Country : Canada, Mexico
- Genre : Documentary
- Studio : National Geographic
- Keyword : cavern, crystal, geology, crystal cave, nature documentary
- Director : Gary Lang, Gonzalo Infante Castañeda
- Cast : Robin Ward