On December 9, 1917, deep beneath Alberta’s frozen landscape, a silent buildup of methane gas met a spark — and in an instant, the Halcyon Coal Mine erupted with deadly force. A violent explosion tore through the underground tunnels, collapsing entire chambers and sending coal dust rolling like a black storm through the darkness. ⚰️ 10 miners were killed instantly. Families waited above as rescue crews descended into smoke-filled shafts, hoping for survivors in one of Alberta’s earliest and most