"Royal Air Force Maintenance Command, 1939-1945." Storemen stack 250-lb MC bombs in one of the tunnels at No. 21 Maintenance Unit at Fauld, near Hanbury, Staffordshire. RAF Fauld, situated in a former gypsum mine, was the main repository of high explosive ordnance in the country. Part of the MU blew up on 27 November 1944, - the World's largest non-nuclear explosion, - and 70 servicemen and civilian workers were killed or declared missing.