Senghenydd colliery disaster, 1913

An explosion in the western workings of Universal Colliery killed 439 miners and one rescuer — the worst mining disaster in British history.

Cause

An official inquiry considered the most likely cause to have been a spark from underground signalling gear igniting a pocket of firedamp (methane), the resulting explosion then propagated through accumulated coal dust in the western workings.

What happened

At around 8am on 14 October 1913 an explosion tore through Universal Colliery's western workings. The blast and the fires it started killed 439 men and boys outright or in the days that followed, plus one member of the rescue effort — 440 deaths in total, of whom 60 were under 20 years old. The disaster left 542 children fatherless and made 205 women widows.

Rescue & recovery

Rescue teams from neighbouring collieries began arriving from 11am, but fires severely hampered the effort — water pipes in the Lancaster shaft had fractured, forcing rescuers to fight the fires with hand extinguishers in 20-minute shifts until a new supply, piped in over 1.2km from a nearby reservoir, was ready by evening. The last survivors were found around 1am the following morning. Recovery work continued until 30 November, hampered by roof falls and pockets of trapped firedamp; by 20 November officials had confirmed 439 dead with 33 still unaccounted for.

Investigation & inquiry

A formal inquiry, chaired by Chief Inspector of Mines Richard Redmayne with coal owner Evan Williams and miners' leader Robert Smillie, sat for 13 days between 2 January and 21 February 1914, putting 21,837 questions to 50 witnesses. It found that management had failed to fit ventilation fan upgrades required under the Coal Mines Act 1911, that coal dust removal and air-quality monitoring were inadequate, that firefighting water supplies were insufficient for a colliery already devastated by one explosion, and that respirators on site were inadequate. The report noted pointedly that a colliery this gassy, already once devastated by explosion, should have had water supplies adequate for exactly the emergency that occurred.

Legal & regulatory aftermath

Colliery manager Edward Shaw faced 17 charges under the Coal Mines Act and was convicted on two — failing to keep proper records and failing to replace a broken lamp locker — and fined £24. The colliery company was convicted on four charges and fined £10 plus costs. The Merthyr Pioneer newspaper calculated the fines worked out at little over a shilling per life lost, a comparison that became notorious. William Lewis, the colliery's owner, died in August 1914; Edward Shaw remained manager until the colliery closed in 1928.

Memorials & commemoration

A National Coal Board memorial — a 20-foot replica of the colliery's winding gear — was erected in 1981 outside Nant-y-Parc Primary School, built on the former colliery site. A further monument to both the 1901 and 1913 victims was unveiled in 2006, and on the centenary, 14 October 2013, Welsh First Minister Carwyn Jones unveiled a national memorial depicting a rescuer aiding a survivor.

Recorded claims

Individual factual claims, each attached to the source(s) that support it below. Where sources disagree, both are kept.

• The colliery manager was fined £24 and the company £10 plus costs — a total the Merthyr Pioneer newspaper calculated at little over a shilling per life lost. ¹

Sources

1. (secondary) Senghenydd colliery disaster — Wikipedia

Record created: 22 August 2026 · Last researched: 22 August 2026