The last booby trap was a simple tripwire stretched from wall to wall at ankle level, just a few yards short of the exit, where hikers impatient to get out of this place would be tempted to break out into a long stride. Chet insisted that Zula step over it and then get all the way out of danger before he snipped it with his Leatherman. He was afraid that it was some sort of particularly fiendish IED that would detonate when the wire was cut. But nothing happened, and Chet staggered out of the tunnel a few moments later looking like the ghost of a miner who had died in the heart of the mountain a hundred years ago.