Iain Stewart from the University of Plymouth takes us on a tour of the Naica Mine's crystal cavern. This working silver mine is located in Chihuahua, Mexico. In 2000, the brothers Juan and Pedro Sanchez discovered the 'Cave of Crystals' while drilling a new mine tunnel.
Stewart has to wear a special suit and breathing apparatus to combat the extreme heat and humidity (50 C or 122 F, and 100% respectively). Would you brave those conditions to see this?