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The Rock of Gibraltar is a monolithic promontory. The Main Ridge has a sharp crest with peaks over 400 metres (1,300 ft) above sea level, formed by Early Jurassic limestones and dolomites. [5] It is a deeply eroded and highly faulted limb of an overturned fold. The sedimentary strata composing the Rock of Gibraltar are
St. Michael's Cave or Old St. Michael's Cave is the name given to a network of limestone caves located within the Upper Rock Nature Reserve in the British Overseas Territory of Gibraltar, at a height of over 300 metres (980 ft) above sea level.
Guns look to the north defending The Rock from an attack by land. The Great Siege Tunnels in the British Overseas Territory of Gibraltar, also known as the Upper Galleries, are a series of tunnels inside the northern end of the Rock of Gibraltar.
The cave was accidentally discovered during World War II, when in 1942 the Royal Engineers were blasting inside the Rock of Gibraltar so as to create an alternate entrance to the lower chambers of St. Michael's Cave, which had been prepared as an emergency hospital. The first sign was when their tunnelling appeared to create no rubble as it had ...
Royal Engineer tunnellers using a water pressure drill to clear solid rock inside the Rock of Gibraltar, 1 November 1941. Gibraltar's first tunnels were constructed by hand in a slow, laborious but durable method of excavation. The first task was to fragment the limestone rock.
Gorham's Cave is a cave situated on the east side of Gibraltar a few meters above sea level [3] which has formed in Jurassic limestone. Total length of this cave is approximately 100 m (330 ft) and at the entrance it is approximately 35 m (115 ft) high. Farther inside, the cave becomes narrower and turns at approximately 90 degrees.
The Great North Road is a large road tunnel in the British Overseas Territory of Gibraltar. It was constructed by the British military during World War II inside the Rock of Gibraltar and remains property of the Ministry of Defence to this day. The road allowed lorries to travel from the north to the south of Gibraltar entirely within the Rock.
Martin's Cave is a cave in the British Overseas Territory of Gibraltar. It opens on the eastern cliffs of the Rock of Gibraltar, below its summit at O'Hara's Battery. It is an ancient sea cave, though it is now located over 700 feet (210 m) above the shore of the Mediterranean Sea. It is only accessible because Martin's Path was constructed.