The Cape Town tug ENSELENI (378-gt, built 2000) would be the other one. Named after a river in Zululand, KwaZulu Natal the Voith Schneider-propelled tug with a bollard pull of 49 tonnes was transferred to the Mother City after only a brief period in Durban, which explains her Durban port of registry.
The port of Durban are currently looking to change their fleet and replace their older tug.
I said I was sad.