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Between 3,500 and 4,000 tonnes of ordnance exploded at the RAF Fauld underground munitions storage depot in the largest non-nuclear explosion in the United Kingdom.

Historical image related to Between 3,500 and 4,000 tonnes of ordnance exploded at the RAF Fauld underground munitions storage depot in the largest non-nuclear explosion in the United Kingdom. from November 27, 1944

RAF Fauld explosion

1944 military accident in Staffordshire, England

The RAF Fauld explosion was a military accident which occurred at 11:11 am on Monday, 27 November 1944 at the RAF Fauld underground munitions storage depot in Staffordshire, England. It was one of the largest non-nuclear explosions in history and the largest on UK soil.
Source: Wikipedia (CC BY-SA)

RAF Fauld

Former Royal Air Force munitions storage location in Staffordshire, England

Royal Air Force Fauld is a former Royal Air Force underground munitions storage depot located 2 miles (3.2 km) south west of Tutbury, Staffordshire and 10.4 miles (16.7 km) north east of Rugeley, Staffordshire, England.
Source: Wikipedia (CC BY-SA)

Largest artificial non-nuclear explosions

List of large explosions

There have been many extremely large explosions, accidental and intentional, caused by modern high explosives, boiling liquid expanding vapour explosions (BLEVEs), older explosives such as gunpowder, volatile petroleum-based fuels such as petrol, and other chemical reactions.…
Source: Wikipedia (CC BY-SA)