A 1944 map of the Batteries and underground tunnels of Gibraltar by Colonel Joseph Marie Emile "Pop" Gareze shows Wilson's Cave near the Magazine Ramp of Green Lane Magazine, to the north of Flat Bastion Hospital.

[3] Tito Vallejo states that the cave was discovered when Magazine Ramp was being excavated during World War II.

A section of the ramp's tunnel collapsed and revealed a natural cavity in the limestone.

The magazine was served from Doncaster Adit off the Great North Road which supplied vehicular access to the outside.

It contained attractive stalgmites and stactites with diameters ranging from under 1 inch (25 mm) to over 1 foot (0.30 m).