Channel 5 (UK) Documentaries - 2016x23 - Ancient Mysteries: Search for the Holy Grail- Followmy.tv

Despite attracting more than 40 million visitors a year, the city of Las Vegas in Nevada is in desperate danger of collapsing. Not for a want of money, but due to dwindling water resources. This documentary charts the efforts of a small team of eco-engineers who are trying to harness and adapt the methods of beavers to solve the problem of water shortages in North America's western states.