Trapped in the Deep Dark:

Overview: On May 2, 1972, 174 miners entered Sunshine Mine on their daily quest for silver. Aboveground, safety engineer Bob Launhardt sat in his office, filing his usual mountain of federal and state paperwork. From his office window he could see the air shafts that fed fresh air into the mine, more than a mile below the surface. The air shafts usually emitted only tiny coughs of exhaust; unlike dangerously combustible coal mines, Sunshine was a fireproof hardrock mine, nothing but cold, dripping wet stone. There were many safety concerns at Sunshine, but fire wasn’t one of them. The men and the company swore the mine was unburnable, so when thick black smoke began pouring from one of the air shafts, Launhardt was as amazed as he was alarmed.