In this image provided by Mike Spilde Mario Corsalini stands near to a gypsum rosette crystal. In a Mexican cave system so beautiful and hot that it is called both Fairyland and hell scientists have discovered life trapped in crystals that could be 50,0 If confirmed, the microbes would represent some of the toughest extremophiles on the planet - dwelling at depths 100 to 400 meters below Earth's surface and enduring temperatures of 45A to 65A Celsius.