Into the Lost Crystal Caves (2010)

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.

Released Oct. 9, 2010 96 min 11+

Genres: Documentary

Keywords: tmdb.crystal, tmdb.geology, tmdb.nature-documentary, mdblist.imdb-tv-movie, mdblist.one-actor, tmdb.cavern, tmdb.crystal-cave

Production Companies: National Geographic

Country: Canada
Production Countries: Canada, Mexico
Languages: English