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(PhysOrg.com) -- Deep within a silver and lean mine in Naica, Mexico, scientists discovered what is now known as Cueva de los Cristales, or Cave of Crystals, close to a decade ago. The gypsum crystals found in this cave measure as long as 11 meters (36 feet) and as thick as 1 meter (3 feet). While these crystals are beautiful and reminiscent of a Superman film, they have had scientists stumped since their discovery

Robots often serve as first responders during mine collapses. A robot can fit into tight spaces, it’s not slowed by noxious fumes and it's expendable if there's another cave-in