If you ever find out let me know as well on PM. I know there was some work done, seismic survey some years back, cant remember seing any news on how, who, ever got any blocks allocated for drilling. That will be a good place to start the trace, someone out knows more than you and I, should be able to give us light.
I am about to head to namibia now on the 7th, i know De Beers marine Namibia there has a Crawler and owns quite a few small ROV’s , but only used for rescue missions on their drill ships.