WWII Tunnels

If the Great Siege Tunnels show you 18th-century military ingenuity, the WWII Tunnels show you something of an entirely different scale. During the Second World War, the British military blasted over 50 kilometres of tunnels through the Rock of Gibraltar, turning it into a self-contained underground base capable of housing a garrison of 16,000 men with enough food, water, and ammunition to hold out for a year without resupply. Walking through even a fraction of this network is a staggering experience. The tunnels on public display, often called Lord Airey's Tunnels, are a section of this vast network. They include operational rooms, a fully equipped underground hospital, communications equipment, and the kind of infrastructure that makes you realise this was not just a defensive position but a functioning city beneath the Rock. The scale of the excavation is difficult to process. The work was carried out largely by the Royal Engineers between 1939 and 1943, often under blackout conditions and under threat of air attack from nearby Spain and North Africa. The tunnel network served as the command headquarters for Operation Torch, the Allied invasion of North Africa in November 1942, when General Dwight D. Eisenhower directed the operation from here. That connection alone gives the place a weight that the visitor displays do a reasonable job of conveying. The rock temperature inside holds at a constant 17 to 18 degrees Celsius regardless of outside conditions, which during a hot Gibraltar summer makes the tunnels pleasant rather than just atmospheric. Displays throughout cover the military history, the daily life of the garrison, and the engineering behind the construction. Entry is included in the Upper Rock Nature Reserve combined ticket (£19). The tunnels are a separate visit from the Great Siege Tunnels and both are worth doing. They tell very different stories about different eras of Gibraltar's military history. Allow at least an hour here.