The German and Axis intelligence services had no idea as to the extent of the top secret city within the Rock.
Although many forms of bribery and subversion measures were taken toward citizens occupying the Rock (example pictured left bottom). Information was not leaked by the loyal population.
Rock of Gibraltar Apes, WW2 Tunnel System - Page 2 1. Rock of Gibraltar 2. Apes 3. Gibraltar Guns 4. North Africa 5. WW2 Guns 6. Naval Guns 7. Gun Battery 8. Inside defence gun 9. Pillars of Hercules 10. Cable Car 11. Tunnel System