The beach at St Margaret's was seen as a possible landing place for an invasion fleets, so was well defended during the war and this tunnel system still remains. The powerful gun batteries were located close by. The tunnel appears to have been dug to allow guns to be placed in rooms cut into the cliff face, to cover the beach for any invasion. The original entrance to the tunnel is located at the end of the esplanade. It is now sealed and the only access is a rope up to the machine gun post in the cliff face. Inside, conditions are good and the majority of the tunnel is lined with tin on the roof and supported by bricks. Parts of the tunnel which are unlined still appear to be sound, although steps lead up to a second room, which has been lost due to erosion but you can get a great view once climbed up but beware of loose chalk rock. & pigeons which use it they fly at you out of nowhere & spiders at the entrances.