Friends who have been rafting together for a long time, on fascinating rivers such as the Brahmaputra and Karnali rivers, in India, obtain the extremely difficult license to go down the coveted Colorado. In an exciting adventure, the friends descend the turbulent waters of the Colorado River, amid the most spectacular landscapes of the Grand Canyon, which hold the ancient history of the Earth. Between the daily challenges and the beautiful and surprising landscapes, they remember a dear friend, whose passion for discovering the mysteries of the great rivers inspired them all.