They are the world's biggest rapids, thundering down the final pitch of the mighty Congo River. Legendary kayaker Steve Fisher and his elite expedition team battle seemingly insurmountable obstacles, navigate the maddening politics of a broken Central African country and face their own worst fears in an attempt to be the first explorers to survive the Inga Rapids.

When pro kayaker Rafa Ortiz makes the decision to paddle over Niagara Falls, he sets in motion an incredible series of events that eventually takes on a life of its own. To prepare for this mission, Rafa enlists the help of world-renowned paddler Rush Sturges and a tight team of their friends. Together they go on a remarkable three-year journey from the rainforest rivers of Mexico to the towering waterfalls of the U.S. Northwest. Their journey concludes in Canada where the team plays a cat-and-mouse game with local police before Rafa's mission comes to a heart-stopping climax at the iconic Falls.