The BBC is filming in the disused Aldwych tube station, one of the shelters, to mark the 75th anniversary of the Blitz which began in the autumn of 1940.
Dr Lucy Noakes, Reader in Modern History in the School of Humanities, is an expert on women and war and a social and cultural historian whose work focuses on the experience and memory of the Second World War.
She explained how Underground stations became shelters: “In the years before the Second World War the outbreak of any future conflict was imagined as apocalyptic, with wave upon wave of enemy aircraft bombing cities until they were utterly destroyed or their inhabitants sued for peace.
“Campaigns in Britain for deep air raid shelters had been largely unsuccessful, and when the Blitz on London began in earnest in September 1940 most people would go to an Anderson shelter in the garden - if they had one - or one of the brick-built street shelters that had been erected in the poorer districts where gardens were rare.
“On the 8 September 1940 thousands gathered outside Liverpool Street station, demanding entrance, and eventually the doors were thrown open and they were let in. From then on, sheltering in the Underground was tolerated if not encouraged: people would queue with their bedding outside the stations for much of the day to ensure a spot on the platform. Eventually 15 miles of platforms and tunnels were used and on one night a record 155,000 people used the Underground as a shelter.