Bethnal Green is a London Underground station in Bethnal Green, London, served by the Central line. It lies between Liverpool Street and Mile End stations, is in Travelcard Zone 2, and is open 24 hours on a Friday and Saturday as part of the Night Tube service. The station was opened as part of the long planned Central line eastern extension on 4 December 1946, having previously been used as an air-raid shelter. On 3 March 1943, 173 people, including 62 children, were killed in a crush while attempting to enter the shelter, in what is believed to be the largest loss of civilian life in the UK during the Second World War.