Trevanion Caves, a large complex behind Dover Sports centre that was adapted to air raid use during WW2. This cave is linked by a long tunnel (Guilford or Guildford Tunnel) to Athol terrace caves and aothers.
Underground Kent Exoloration Forum members exploring a WW2 underground complex near Dover, 2006. This facility was a backup for DUMPY, the Combined Headquarters under Dover Castle.
Short video taken from a helicopter flying over the site of Lydden Spout Battery, a WW2 3 x 6" gun site. Visible are the old cookhouse, the Battery Plotting Room, a gun position.