Explore The Great Siege Tunnels

Dug out from the solid limestone by the British during the Great Siege of Gibraltar

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The Great Siege Tunnels, Gibraltar

Gibraltar Tours

The Great Siege Tunnels in Gibraltar are one of the finest examples of 18th-century military engineering. Carved by hand into the northern face of the Rock during the Great Siege of Gibraltar (1779–1783), the tunnels played a crucial role in the defence of Gibraltar.

The Great Siege took place during the American War of Independence, when Spain and France joined forces in an attempt to recapture Gibraltar from Britain. Despite being heavily outnumbered and subjected to sustained attacks, the British garrison successfully defended the Rock through a combination of determination, engineering and military ingenuity.

Great Siege Tunnels Gibraltar

A Fortress Within a Fortress

In 1782, Sergeant-Major Henry Ince of the Royal Engineers proposed an ambitious plan to excavate tunnels into the northern face of the Rock, allowing cannons to be positioned where they could fire on the Spanish lines below.

Using hand tools, explosives and enormous physical effort, soldiers excavated hundreds of feet of tunnels in a remarkably short period. Gun ports and chambers were created within the limestone, turning the Rock itself into a formidable defensive position.

Great Siege Tunnels Tour Gibraltar

Today, the Great Siege Tunnels provide a fascinating insight into the engineering and determination behind Gibraltar's defence. Often described as a fortress within a fortress, the network includes original gun positions, chambers, passages and lookout points carved directly into the Rock.

Historical Displays & Stunning Views

A visit to the Great Siege Tunnels in Gibraltar combines military history with impressive views across the northern side of the Rock. Visitors can see original gun emplacements and historical displays that help explain how the tunnels were constructed and how they were used during the Great Siege.

The tunnels also provide an insight into the wider military history of Gibraltar and the strategic importance of the Rock, making them an essential stop on a Gibraltar Tour.

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FAQ

What are the Great Siege Tunnels in Gibraltar?

The Great Siege Tunnels are a network of military tunnels carved by the British into the northern face of the Rock of Gibraltar during the Great Siege of Gibraltar from 1779 to 1783. The tunnels are one of the finest examples of 18th-century military engineering and contain original gun positions, chambers, passages and lookout points.

Why were the Great Siege Tunnels built?

The Great Siege Tunnels were built to help defend Gibraltar during the Great Siege. In 1782, Sergeant-Major Henry Ince of the Royal Engineers proposed excavating tunnels into the northern face of the Rock so that cannons could be positioned to fire on the Spanish lines below. Soldiers used hand tools and explosives to carve the tunnels and create gun ports and chambers inside the limestone.

Who built the Great Siege Tunnels in Gibraltar?

The Great Siege Tunnels were excavated by British soldiers and military engineers during the Great Siege of Gibraltar. Sergeant-Major Henry Ince of the Royal Engineers is credited with proposing the tunnel excavation in 1782, which allowed the Rock itself to be turned into a defensive position.

What can you see inside the Great Siege Tunnels?

Visitors to the Great Siege Tunnels can see original gun emplacements, chambers, passages and lookout points carved directly into the limestone. Historical displays explain how the tunnels were constructed and used during the Great Siege, while the tunnels also provide views across the northern side of the Rock.

Which Gibraltar tours include the Great Siege Tunnels?

The Great Siege Tunnels are included in several Inside-Out Rock Tours itineraries, including the Standard, Extended, Tunnels, Intermediate, Ultimate and Corporate Tours. They are also included in the General and Highlights coach tours too. Visit our Gibraltar Tours page to compare the different itineraries and find a tour that includes the Great Siege Tunnels.