He had trained as a miner in South Africa and was in charge of tunnelling operation in Gibraltar during World War II.

[1] Williams also gave his name to Arow Street which is a tunnel entirely inside the rock.

It was built in 1942 to bypass a landslide which had been triggered by a large detonation of explosives during quarrying operations.

The landslide completely blocked off the road to Catalan Bay Village.

[3] On 1 October 2012 a fire occurred inside the tunnel in a disused control room which took two hours to extinguish.