The six anglers travel to their most remote destination yet - the mighty Mekong River in Laos. Here people fish for survival, not for sport. The anglers must battle the blistering heat and the ferocious currents of the widest rapids in the world. They will use traditional bamboo rods, throw themselves into the local way of throwing cast nets, and use all their own experience and sport fishing equipment to see if they can discover anything in the Mekong that the local methods cannot. Matt Hayes will be joined by Mr Mai, the headman of his village on Baan Hangkon Island, to judge which angler leaves the expedition whilst the rest journey on. The heat, the terrain and the simple equipment make this the toughest leg of the expedition yet. Presented by Ben Fogle.