On  27 November 1944 at 11:11am an explosion in the underground storage site at Hanbury created a crater 100 ft deep 250 yds (750 ft) across when 3.500-4,000 tons of bombs and ammunition detonated.  As well as the crater and destruction of a nearby farm, a reservoir was destroyed and the 450,000 cubic metres of water released caused flooding which added further to the damage.  The explosion was the largest explosion in the UK and one of the largest non-nuclear explosions in the world.  The numbers killed is unknown but thought to be around 70.  The cause is thought to have been due to a worker using a brass chisel to remove a detonator in contravention of regulations.