Blocks of Quaternary Monkey's Cave Sandstone are said to be "still visible in gun embrasures fringing the cliffs of the southwest Europa coast.

[3] Monkey's Cave was used during the Second World War as an entrance to the artificial tunnel named AROW Street, which was used for storing ammunition and supplies.

Soldiers in 1953 who were in the Royal Electrical & Mechanical Engineers would enter AROW Street through this cave and make their way to their instrument workshop located in the Rock.

The engineers would get to their cave along one of the many internal roads that run within the Rock of Gibraltar.

Their cave had windows which allowed the engineers to work with natural light and they were able to see views across the Straits of Gibraltar to Africa.