A rare glimpse of the cave of crystals // BBC, 19 January 2010: «special cooling suit — which is basically like a suit of chain mail but filled with ice cubes. Then there’s a breathing system which feeds cool, dry air into your mask.»
Giant Crystal Cave Comes to Light // National Geographic News, April 9, 2007: «Temperatures hovered consistently around a steamy 136 degrees Fahrenheit (58 degrees Celsius)»
Stefan Lovgren, Giant Crystal Cave’s Mystery Solved // National Geographic News, April 6, 2007: «In 1910 miners discovered another spectacular cavern beneath Naica. .. the Cave of Swords is closer to the surface, at a depth of nearly 400 feet (120 meters).»
ngm.nationalgeographic.com
Cavern of Crystal Giants // National Geographic, November 2008: « a vest with more than a dozen palm-size ice packs sewn into pockets across the chest and back. Then another vest to insulate the ice against the heat. Then, over everything, a bright orange caving suit. A helmet, a headlamp, a respirator mask blowing ice-cooled air. Gloves, boots. Even for cavers cocooned in all this protective gear, the heat is exhausting and dangerous; most trips inside last no more than 20 minutes.»
