I do not know of any recreational diving off the coast of Namibia. The coastline is very rough, as is the sea.
The only diving in Namibia I am aware of is in Lake Otjikoto.
"Otjikoto is situated close to the mining town of Tsumeb. Part of an underground river system, the lake was exposed when the roof of what was a large dolomite cave fell in. The lake is small with a diameter of about 102m, but very deep, with a depth estimated to be in excess of 142m in places.
During the first world war the Union of South Africa, still part of the British Empire, was ordered to invade German South West Africa. The German troops were heavily out-numbered by the Union forces, but managed to hold out for nearly a year before finally being forced to surrender. The final hostilities took place in the vicinity of Otjikoto and, rather than surrender their weapons and artillery to the enemy everything, including the heavy guns and ammunition wagons, was dumped into the lake. Many of these relics have since been recovered, but not all."
