These tunnels are one of the main attractions of the Rock of Gibraltar. The tunnels were carved out of the rock by hand during the Great Siege which took place between 1779-1783. This was done in order to defend Gibraltar against the Spanish and French forces who were trying to recapture Gibraltar from the British.
Whilst tunnelling it was decided that a horizontal hole be blasted in the rock face in order to improve ventilation for the workmen. On closer examination it was realised that a gun could be put in place to bear down on attacking forces.
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