Robson’s journey continues in Patagonia, a region spanning the southern parts of Chile and Argentina. He is on a mission to fish at the southernmost city in the world, Ushuaia. This place really is the end of the Earth – if Robson went much further south, he would end up in Antarctica. But before Robson gets there, he is after an extra-special prize. Ushuaia is in Argentinean Patagonia. But on the Chilean side of the border, in Torres del Paine, there could be waiting one of the catches of Robson’s life. Robson was raised on salmon fishing, and in the waters here swim Chinook salmon, the largest on the planet. The biggest Robson has ever caught was round 18lb. In these waters, he hopes to get one double that size. When he gets one on the end of his line, he can barely believe the fight this mighty fish puts up. With its runs and leaps, this is one of the most spectacular sights ever seen on the water. But with a fish like this, there are no guarantees – and just because Robson has it on the line, it doesn’t mean he is going to get it to the shore.