A rare glimpse of the cave of crystals [Архівовано 20 січня 2010 у Wayback Machine.] // 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.»
Stefan Lovgren, Giant Crystal Cave's Mystery Solved [Архівовано 18 лютого 2017 у Wayback Machine.] // 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 [Архівовано 6 вересня 2009 у Wayback Machine.] // 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.»
A rare glimpse of the cave of crystals [Архівовано 20 січня 2010 у Wayback Machine.] // 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.»
Cavern of Crystal Giants [Архівовано 6 вересня 2009 у Wayback Machine.] // 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.»
Stefan Lovgren, Giant Crystal Cave's Mystery Solved [Архівовано 18 лютого 2017 у Wayback Machine.] // 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).»
