The avalanche raced down a steep hill in Aberfan, Wales, sucking everything in its path into the chaos: landscape, buildings, an entire schoolhouse. When David Evans, the owner of a local pub, heard about it from a neighbor, he ran into the street. “Everything was so quiet, so quiet,” he told historian Gaynor Madgewick. “All I could see was the apex of the roofs.”
The avalanche wasn’t snow—it was coal waste that had slid down a rain-saturated mountainside. On October 21, 1966, nearly 140,000 cubic yards of black slurry cascaded down the hill above Aberfan. It destroyed everything it touched, eventually killing 144 people, most of them children sitting in their school classrooms.
The tragedy in Aberfan would become one of the United Kingdom’s worst mining disasters—and it was completely avoidable.
