they built the dam, the river god broke it twice (Nyaminyami, Kariba)

My grandfather was Tonga, valley people, before they were moved off their land for the Kariba dam in the late 50s. He told this and I've checked the dates against the records and they line up which is what unsettles me. The Tonga believe in Nyaminyami, the Zambezi river god, body of a snake, head li……