A few miles off the coast of Durban a female humpback whale and its calf – the last of thousands that migrated along South Africa’s east coast from May to December – splash their fins playfully on the surface of the Indian Ocean.
Out in the deep, they are unperturbed by a murky brown sheen sitting on the surface of the South African city’s harbour, where brilliantly white yachts worth millions of rand float in water contaminated with human excrement.
