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Explore the British World War II tunnels in Gibraltar

Gibraltar was of strategic importance during WW2 and storage space was needed for food and equipment and accommodation of troops. A tunnel system was built to not only give protection during air attacks, but also to store the huge quantities of ammunition, food and other items. The tunnels became almost an underground city, with space for 16,000 troops. There was a telephone exchange, bakery, hospital, power generating station and water distillation plant in the 34-mile tunnels.