Every minute mattered.
Rescuers desperately searched for signs of life beneath the thick black sludge.
Many refused to stop digging even after exhaustion set in.
As news of the catastrophe spread, the entire nation watched in horror.
Television and newspaper reports carried heartbreaking images from the small Welsh village.
Messages of support poured in from around the world.
But the scale of the tragedy was devastating.
When the recovery effort finally ended, 144 people had lost their lives.
Among them were 116 children.
Almost every family in Aberfan was affected.
Some parents lost multiple children.
Some children lost classmates, friends, and siblings.
The grief was unimaginable.
In the weeks that followed, investigators examined how such a disaster could have happened.
Evidence revealed that concerns about the stability of the coal tip had been raised before the collapse.
Warnings had been given.
Questions had been asked.