original_query: What was the Aberfan disaster?
query: What was the Aberfan disaster?
answer: The Aberfan disaster was the catastrophic collapse of a colliery spoil tip on October 21, 1966, in the Welsh village of Aberfan.  A build-up of water in the tip caused it to slide downhill as a slurry, engulfing Pantglas Junior School and houses, killing 116 children and 28 adults.