Overview: The brothers take a journey on the world's third longest river, the Yangtze. Peter and Jeff grew up near the Yangtze and now they are returning to this part of the river known as the Three Gorges to get one last look before this land is consumed by the rising waters. The Chinese government is building the world's biggest dam on the Yangtze in this region and iIt will displace millions of people from theirs homes and a way of life they have always known.