Tonight's episode uncovers life in Olusosun rubbish dump. Here, around a thousand people live on top of the rubbish in houses built from scrap. It looks like the end of the world, but the film reveals that there is order – and honour – among this seemingly chaotic environment. There are shops, bars, restaurants, cinemas, even a mosque, and the scavengers have set up their own kind of government, with a democratically elected chairman at the head.

Lagos's version of Venice is a slum, built on water, called Makoko. This three-part observational series continues to explore one of the most extreme urban environments on the planet, by taking a trip into the lives of those who choose to live and work on the waters of Lagos Lagoon. Chubbey is a fisherman who lives in a house built on stilts. With 18 children and five grandchildren to support, he has become an expert at making money from the most unlikely of places. Whether he is building a fish pond in the same water he uses as a lavatory, or renting out a spare room which he has not even built yet, he has always got some scheme or another on the go. But when his teenage son starts to hang out with a local gang, he is left with a dilemma familiar to parents all over the world.