September 2, 2010
Incredible ,, but ,, Danger....
Cueva de los Cristales (Cave of Crystals), is a cave Naica Mine in Chihuahua, Mexico. Room containing a giant selenite crystals, some of the largest natural crystals ever found. Largest crystal cave is 11 meters (36 feet) long, 4 meters (13 feet) in diameter and weighs 55 tons. Cave about 30 m (98 ft) long, 10 m (33 feet) wide and nearly 300 meters (900 feet) below the earth's surface.
This cave is very hot with temperatures reaching up to 43 ° C (109 ° F) with humidity of 90-100 percent. The temperature of the heat is due to proximity of the cave with magma chamber.
Relatively unexplored cave, because humans can only survive for about ten minutes without any protection, and only 45 minutes with special equipment.