was also filmed extensively in Lechuguilla Cave. Lechuguilla Cave was also shown in the BBC documentary series Planet Earth. The fourth episode, titled "Caves", airing on April 22, 2007, documented scientists and filmmakers exploring Lechuguilla Cave, including the Chandelier Ballroom, which has high-quality crystals. The team took two years to get permission to film. In October 2016, crew members from London-based production company Nutopia descended into Lechuguilla Cave with microbiologist Hazel Barton to film a sequence for season 1, episode 4 (titled "Genesis") of the National Geographic series One Strange Rock. See also List of longest caves in the United States List of longest caves References External links Lechuguilla map and images Nova: The Mysterious Life of Caves, Journey into Lechuguilla The Giant Crystal Project Lechuguilla Newsletter from the National Park Service (PDF) BBC Press release: Planet Earth Caves and Lechuguilla Caves of New Mexico Limestone caves Wild caves Landforms of Eddy County, New Mexico Carlsbad Caverns National Park