An 860-ton machine arrived in the Nevada desert on 50 trucks, spun 48 cutter wheels through volcanic rock at 18 feet an hour for 31 months, and cut a five-mile horseshoe 984 feet down that now has barn owls living in it - Autonocion.com

An 860-ton machine arrived in the Nevada desert on 50 trucks, spun 48 cutter wheels through volcanic rock at 18 feet an hour for 31 months, and cut a five-mile horseshoe 984 feet down that now has barn owls living in it    Autonocion.com