tunnel partially collapsed and was filled with earth and water from the fractured water mains and sewers above, which also flowed through the cross-passages into the southbound platform tunnel, with the flooding and debris reaching to within of . According to the Commonwealth War Graves Commission (CWGC), sixty-six people in the station were killed – although some sources report 64 shelterers and four railway staff were killed, and more than seventy injured. The damage at track level closed the line to traffic between and . The closed section and station were reopened on 12 January 1941. In October 2000 a memorial plaque commemorating this event was placed in the station's ticket hall. It stated that 64 people died, which differed from the CWGC register at the time, and other sources. On 14 October 2010 this was replaced with a new commemorative plaque which does not state the number of fatalities. This second plaque was again replaced with an official memorial stone in Welsh slate commissioned by London Underground and that was unveiled on 14 October 2016. The second removed plaque was again deposited with the London Transport Museum. The bombing of the station during the war is briefly mentioned in Ian McEwan's novel Atonement, while the film based on the book depicts the station's flooding, in which a main character is killed. A character dates the event incorrectly (September in the novel; 15 October in the film). The film also refers to the fracturing of gas mains, as well as water. The bombing of the station is also featured in the children's novel Billy's Blitz by Barbara Mitchelhill when Billy and his family are sheltering in the tube station on the night of 14 October 1940. Ben Aaronvitch's novel Whispers Under Ground also mentions the flooding. A radio documentary exploring the background to the bombing and events on the day was broadcast on Riverside Radio to mark the 80th anniversary of the bomb on 14 October 2020. Services National Rail All National Rail services at Balham are operated by Southern using EMUs. The typical off-peak service in trains per hour is: 8 tph to 2 tph to via 2 tph to via , of which 1 continues to 2 tph to via 2 tph to via 1 tph to 1 tph to via During the peak hours, the station is served by an additional half-hourly service between London Victoria and