A 45 minute walking tour , an expert guide will take you to follow the footsteps of Churchill, Sikorski and De Gaulle. A small example of the 33 miles of tunnels inside the rock. Frozen food stores, kitchens, hospitals, communication centre, a city within a city. You will end the tour at Princess Anne’s AA Battery where your tour vehicle will be waiting.The tunnels were excavated during 1939-1944 by both Royal and Canadian engineers.