![Into the Lost Crystal Caves Into the Lost Crystal Caves](https://img.moviesjoy.is/resize/188x288/7a/15/7a15c0a887c15e3ecf5dab661d189bfb/7a15c0a887c15e3ecf5dab661d189bfb.jpg)
Into the Lost Crystal Caves
NGC takes viewers inside one of the world's greatest natural wonders - a colossal crystal cave dubbed Superman's stronghold, complete with stunning crystals up to 36 feet long and weighing 55 tons. A team of experts enters the underground, braving temperatures that might kill a human after only 15 minutes. They'll defy physical limitations in order to investigate a chasm that may lead to another - and probably more magnificent - crystal tunnel.