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Into the Lost Crystal Caves
NGC explores one of the world's greatest natural wonders, a massive crystal cave dubbed "Superman's Fortress," which contains magnificent crystals up to 36 feet long and weighing 55 tons. A group of experts enters the cavern, braving temperatures that could kill a human after only 15 minutes of exposure. They'll push their physical limits to explore a crevasse that could lead to another-and possibly more spectacular-crystal cave.
Released:
2010
Duration:
N/A min
IMDB:
6.7 min
Production:
National Geographic
Genre:
Documentary
Country:
Canada
Stars:
Robin Ward,
