One hundred years ago, on Oct. 14, 1913, the Senghenydd Colliery in Glamorgan, South Wales, exploded, resulting in 439 fatalities. This was the worst coal mine disaster in the history of the U.K. The incident is believed to have been started by methane gas (firedamp) ignited by electric sparks from equipment, possibly an electric bell signal. The gas explosion disturbed coal dust in the mine, creating a coal dust cloud that ignited. The dust explosion raised still more coal dust and the explosions continued to propagate.
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