The amazing cave of crystals in Mexico

Cave of the Crystals or Giant Crystal Cave(Spanish: Cueva de los cristales) is a caveconnected to the Naica Mine at a depth of 300 metres (980 ft), in Naica, Chihuahua, main chamber contains giant selenitecrystals (gypsum, CaSO4 • 2H2O), some of the largest natural crystals ever found.  The cave’s largest crystal found to date is 12 m (39 ft) in length, 4 m (13 ft) in diameter and 55 tons in weight. When it was accessible, the cave was extremely hot, with air temperatures reaching up to 58 °C (136 °F) with 90 to 99 percent humidity. The cave is relatively unexplored because of these factors. Without proper protection, people can only endure approximately ten minutes of exposure at a time. The cave was discovered in April 2000 by brothers Juan and Pedro Sanchez while drilling in the mine. As of October 2015, the mine had reflooded and the cavern filled once more with the water rich in minerals required for the crystals to grow. A group of scientists known as the Naica Project ha