0m •
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.
National Geographic • US
Budget: $0
Revenue: $0
2020•
10.0
2018•
0
2007•
7.6
1983•
7.9
2014•
0
2020•
8.0
1996•
7.5
2017•
6.9
2014•
8.5
2003•
6.8
2019•
0
2009•
6.0
2019•
8.0
2023•
7.3
2018•
7.2
