Kenya: first contact with African land, a free fall lasting a few seconds that ends in the crater of a volcano island. 1,500 km further north, in Ethiopia, another volcano, Erta Ale, will allow the Okavango team to make one of the most fantastic descents to the burning bowels of the planet. Between the two, Nicolas and the men of Okavango will take a route, which far from the beaten track, will lead them to the forgotten of time, these small tribes who live on the borders of known Africa. Throughout the Rift Valley, this immense fracture that broke the continent in two ten million years ago, Herbert Thomas, the scientist adventurer of Operation Okavango, introduced Nicolas Hulot, the office of the humanity.