The Knock No One Expected

In 2010, thirty-three Chilean miners were trapped 2,300 feet underground in the San José copper mine near Copiapó. For seventeen days, no one on the surface knew if they were alive. Families gathered at the mine entrance around the clock, holding vigils, praying, refusing to leave. The Chilean government drilled exploratory boreholes into the earth — narrow shafts barely eight inches wide — hoping against hope to reach the refuge chamber.…