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This large underground headquarters was built in 1942 as a naval command centre. It is situated on Portsdown Hill beneath Fort Southwick, a large 19th Century Palmerston Fort. There are over a hundred rooms in the tunnel complex, and it was fully functional with offices, dormitories, Latrines, telecommunications etc, and it was utilised during WW2's 'Operation Overlord' as the main communication s centre, used by the Royal Navy, to plot the progress of the Allied troops during the invasion of Normandy on D-Day and throughout the remainder of the War.