 The Tunnels of the Great Siege were first begun on May 25th 1782. Sergeant Major Ince conceived the idea to dig a tunnel to an area called Notch, an inaccessible natural platform on the north side of the rock, to install cannons aimed at Spanish positions. The idea was approved and encouraged by govenor Elliot. Armed with sledgehammers, crowbars and explosives, eighteen men excavated a tunnel 25 metres long in five weeks. This area is now known as the Windsor Gallery.
Following the Great Siege, excavations continued through to the Second World War, completeing more than 50 kilometres of tunnels and galleries. The majority of these are on military grounds.
Visitors can explore an area about 200 metres long, with an average height of 2.10 metres and 1.83 width. Full size figures, representing moments of the Great Siege and tunnel digging, adorn this area. In the entrance and galleries there are several Victorian cannons and one from the 18th century. The visit ends at an observation point overlooking the Mediterranean on the northern side. | 
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