By Michael Scott
These are the secret World War Two tunnels the British Army used to defend Gibraltar from a German invasion.
Christened the Great North Road, the mile-long bombproof tunnel runs right inside the Rock of Gibraltar.
It was built in 1940 so soldiers and equipment could remain safely underground while Luftwaffe planes bombarded the island.
Gibraltar was strategically extremely important during the Second World War, as it allowed the British to control access to the Mediterranean Sea.
After the war, the tunnels were kept intact by the Ministry of Defence just in case they should ever be needed again. They are currently used for training troops in underground warfare.
Above ground, a gun battery still faces out towards the Spanish coast to guard against enemy warships trying to pass through.
The separate passages, or adits, leading off the main 60ft-wide highway are named after British districts and cities to allow soldiers to know where they are inside the rock.
The place names include Maida Vale, Peterborough, Doncaster, and Durham.
The tunnels house everything 16,000 soldiers needed to survive for 16 months – a telephone exchange, a generating station, a water desalination plant, a hospital ward, a bakery, a frozen food store, munitions stores and a station to repair damaged vehicles and passageways.
They were so well positioned and equipped that General Dwight Eisenhower used the Admiralty Tunnel for the Allied Command Headquarters in 1942 to plan the allied invasion of North Africa.
The tunnels were photographed by Michael Scott in September last year.
He said: “They were great to see. They were very dark and dusty in some places, but really impressive to look at.
“The first thing that hits you is the heat. They have internet servers beneath them now and they feed the hot air out into the tunnels.
“The generators were really remarkable. It’s hard to imagine how they got such massive machines down there in the first place.
“It was fantastic to see something that’s not really on the map.
“You hope they never have to be used during wartime again, but they still seem to be very strong.”