A memorial to all of the victims of Wales' mining disasters is being unveiled today, 100 years since the Senghenydd Colliery Disaster. 439 miners, and one rescue worker, were killed at the Universal Colliery on 14 October 1913.
A graphic real-time re-enactment of Britain's worst mining tragedy has brought the agony of the day's events to life on Twitter.
The Senghenydd colliery disaster was caused by an underground gas explosion in a sprawling mine employing more than 2,500 people near Caerphilly.
The tweeting began with the miners' journeys to work and continued through as the day's events unfolded:
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