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.
Cinematography
Crystals so massive they broke every wide-angle lens they owned.
Practical Effects
Actual humans in actual 120°F suits, actually almost dying.
Sound
The silence of the cave vs. heavy breathing inside spacesuits.
Director
Gary Lang
Trivia, insights & behind the scenes
The Naica mine was pumped dry for mining; when they stopped pumping, the cave flooded again and is now inaccessible.
Director Gary Lang pioneered the 'extreme environment' documentary format for Nat Geo, later used in Mars exploration specials.
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