The Tube at 150: London Underground in pictures
The Underground played a crucial role in the Second World War, when thousands of people fled to the Tube to escape the Blitz. Although the authorities initially tried to prevent people sheltering in the stations they later relented, and beds and toilet facilities were installed. Some nights more than 150,000 people took refuge in the Tube. However, it was not always safe: 173 died in a crush at Bethnal Green in 1940 and 16 were killed when a bomb hit Bounds Green.