AUGUST 5–6 2:00 PM
Raul Villegas was driving a truck up a ramp … 1,800 feet underground … when he heard the crack and first saw the dust. Villegas was used to hauling rock out of copper mines in northern Chile, so he had often heard the creaks and moans of the angry earth. He drove on, passing a couple of miners heading down. But as he inched up the ramp he felt a wave hit his truck, “like when there is a dynamite explosion.” Glancing back, it was as if he were looking down the heart of an erupting volcano. He rushed up the endless, sharp turns of...