Second World War Tunnels
During Word War II, the network of subterranean corridors dug during the Great Siege were expanded in order to accommodate a 16,000-strong garrison and all of its supplies. A further 17 miles of tunnels were added to the existing seven, the main purpose of which was to connect up a new military base on the south-east of Gibraltar with established bases on the west. Two major north-south arteries were also added – the Great North Road and Fosse Way – both of which run effectively the entire length of the Rock.
Great Siege and Second World War Tunnels, Gibraltar, +350 200 74950