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Presenter: Angie Lucht | Webinar | 
National Geographic went 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. Our presenter, Angie Lucht, was one of the four cavers/mountain rescuers on the team that went into the caves. She will talk about the boundaries of the physical limitations and new explorations while filming “Into the Lost Crystal Caves”.