The Deep Shelter hidden under Clapham South tube station
During the second world war a set of tunnels were built underneath Clapham South tube station. 100 metres down and built by hand, (yes, by hand!) these were designed to be used as an air raid shelter and we got to visit! This is the staircase from the deep shelter up to Clapham South tube station platform level. Where the exit emerged in the tube station is now sealed and its location is a secret for "security reasons"! Eeek!