
Martin starts in Chongqing, fastest growing city in the world, where he works in a factory to build his own electric motorbike, and is astonished by the lack of automation. Later he visits the world’s biggest hydroelectric plant, the Three Gorges Dam, and at the other end of the plumbing hierarchy, the world’s biggest public convenience

Guy builds his own electric motorbike in a factory in Chongqing, the fastest growing city in the world, before visiting the world's biggest public toilet and heading along the Yangtze towards Shanghai.