T.Roosevelt.

After Roosevelt lost the 1912 election, he needed some time away from all the politial troubles. Roosevelt went to visit his son. When the trip went from a tour to a survival contest. Brazil's minister of foreign affairs told Roosevelt about "an unknown river" worth exploring, the River of Doubt. The trip nearly killed Roosevelt, it was such a hard thing to do. Nearly no one believed he had done it. The river of doubt is called "Roosevelt's Darkest Journey".