Naica Crystal Cave - Mexico
A team of international scientists explore a Mexican cave filled with giant crystals. With temperatures near 120 degrees Fahrenheit (48.8 Celsius), and over 80 per cent humidity, the cave is one of the deadliest environments on earth. Without specialized suits and equipment, the scientists would die in minutes. Their mission: to unlock the secrets of the mysterious ancient crystals, some of the largest ever discovered.
2 http://youtu.be/co3jDaWzxUc
3 http://youtu.be/my0pDEzyjBc
4 http://youtu.be/ZcuMek9Dcu0
5 http://youtu.be/Kf6ChGLC8Es
Source: http://www.youtube.com/user/DocumentalesMexic0
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