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Great Siege Tunnels: Gibraltar's Underground Fortress

Explore Gibraltar's Great Siege Tunnels: a testament to military engineering, offering a unique glimpse into the Rock's strategic past.

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The Great Siege Tunnels in Gibraltar are an impressive network of man-made tunnels carved into the Rock of Gibraltar. Dug primarily during the Great Siege of the late 18th century, they showcase military engineering and offer scenic views.

A brief summary to Great Siege Tunnels

Local tips

  • Wear comfortable shoes, as the terrain within the tunnels can be uneven.
  • Consider visiting during off-peak hours (early morning or late afternoon) to avoid crowds.
  • Bring a camera to capture the panoramic views from the tunnel exits.
  • The Great Siege Tunnels are part of the Upper Rock Nature Reserve; a single ticket grants access to multiple attractions.
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Getting There

  • Walking

    From Casemates Square, walk east along Main Street, then turn right onto Line Wall Road. Continue until you see signs for the Great Siege Tunnels, approximately a 15-20 minute walk. The entrance is at 1b Leanse Place.

  • Public Transport

    Take a bus from the Gibraltar International Airport or the city center towards 'The Rock' or 'Great Siege Tunnels'. The closest bus stop is at the junction of Main Street and Line Wall Road. From there, walk towards 1b Leanse Place (approx. 10 minutes), following the signs. A single bus fare is approximately £2.20.

  • Taxi

    Taxis are available at the airport, border, and Grand Casemates Square. A taxi ride from the airport or city center to the Great Siege Tunnels will cost approximately £5-£10. Ensure the driver knows you want to go to the Great Siege Tunnels at 1b Leanse Place.

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Discover more about Great Siege Tunnels

The Great Siege Tunnels, also known as the Upper Galleries, represent a remarkable feat of military engineering born out of necessity during the Great Siege of Gibraltar (1779-1783). During this period, Spain and France attempted to recapture Gibraltar from the British. To defend against the siege, Governor General Eliott offered a reward for a solution to mount guns on the precipitous northern face of the Rock. Sergeant Major Ince proposed tunneling to reach a projection known as the Notch, initiating a project that would transform Gibraltar's defenses. Construction began in May 1782, with miners using manual labor, explosives, and basic tools to carve through the dense limestone. Originally intended as a passage to install artillery, ventilation issues led to the creation of gun ports, providing the British with strategic firing positions. These embrasures allowed them to target Spanish batteries, significantly altering the siege's dynamics. Over time, the tunnel network expanded, serving various military purposes. In the 19th and 20th centuries, especially during the Second World War, the tunnels were extended to accommodate a large garrison and store supplies. Today, visitors can explore this labyrinthine network, witnessing firsthand the ingenuity and determination that shaped Gibraltar's history. The tunnels offer a unique perspective on military strategy and provide panoramic views of the isthmus and surrounding areas.

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