Plot: The first episode in the series focuses on the outbreak of the Blitz in September 1940. The first bombs used against Blitz Street, a row of terraced houses specially built on a remote military base and subjected to a frightening range of large-scale bombs and incendiaries similar to those dropped by the Luftwaffe - are the SC50 (25kg of TNT), the most common bomb dropped on the first day of bombing in London, and the SC500 bombs, which contained 250kg of TNT