In World War II, the buildings of King's College London were used by the Auxiliary Fire Service with a number of King's staff, mainly those then known as college servants, serving as firewatchers. Parts of the Strand building, the quadrangle, and the roof of apse and stained glass windows of the chapel suffered bomb damage in the Blitz. During the post-war reconstruction, the vaults beneath the quadrangle were replaced by a two-storey laboratory, which opened in 1952, for the departments of Physics and Civil and Electrical Engineering.