Extensive Second World War tunnel air raid shelter complex for 2500 people, cut into the chalk cliffs south of Crete Hall Road, Northfleet 1939/40 to provided protection for workers at the adjacent Henley Telegraph Works. The latter was engaged in important war work. This included manfuacture of electrical and rubber products as well as the Pipeline Under the Ocean (PLUTO). It is on a grid plan, with shelter corridors crossing each other at right angles. There are 7 entrances to the complex through the cliff face. The complex contains a power and filtratrion plant, decontamination centre, control room, squad room, latrine rooms and a first aid centre. It was decommissioned in 1945 and subsequently used as an industrial store. It is now empty.