The world's largest crystals are found in the Crystal Cave of Naica, Chihuahua. Cavers don cooling suits to survive in the 50° C heat and 100% humidity in this renowned Mexico cave. This photo was taken for the Naica Project.
© Speleoresearch Archive, C/PRODUCCIONES and Films La Venta, 2010
Source article: Exploring caves in Mexico: the speleologist's new frontier