In northeastern Chad, a hundred kilometres from the nearest road and a thousand kilometres from the capital city of N’Djamena, lie the Tibesti Mountains. Three times the size of Switzerland, void of people and barely explored.

The Tibesti is a volcanic mountain. It is so secluded from any trace of civilisation that even volcanic activity here goes unseen. In 2011, astronauts in the International Space Station photographed a kilometre long plume of smoke - completely unnoticed by anyone on Earth.