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Communal air raid shelters under construction in a south London street at the outbreak of World War II, 2nd October 1939. The shelters are brick with rooves of reinforced concrete, and are being provided for residents without the space for shelters of their own. (Photo by Paul Popper/Popperfoto/Getty Images)

Communal air raid shelters under construction in a south London street at the outbreak of World War II, 2nd October 1939. The shelters are brick with rooves of reinforced concrete, and are being provided for residents without the space for shelters of their own. (Photo by Paul Popper/Popperfoto/Getty Images)