To mark the 50th anniversary, the Envireau Water team took time today to reflect on the Aberfan disaster.
The Aberfan disaster was the catastrophic collapse of a colliery spoil tip in the Welsh village of Aberfan, near Merthyr Tydfil, that killed 116 children and 28 adults on 21 October 1966.
The collapse was caused by the build-up of water in the accumulated rock and shale tip, which suddenly slid downhill in the form of slurry.
More than 1.4 million cubic feet of debris covered a section of the village in minutes. The classrooms at Pantglas Junior School were immediately inundated; young children and teachers died from impact or suffocation. Many noted the poignancy of the situation: if the disaster had struck a few minutes earlier, the children would not have been in their classrooms, and if it had struck a few hours later, they would have left for the half-term holiday.