PARK CITY (Utah)(AFP) - Crocodiles, piranhas and anacondas didn't deter a 54-year-old man from completing an epic swim of the Amazon, and his story is now captivating audiences at the Sundance Film Festival. "Big River Man" directed by John Maringouin is showing in the World Cinema Documentary Competition at this year's annual independent film festival here. The "Big River Man" is Martin Strel " an unassuming, solidly built Slovenian man who likes to eat and imbibe perhaps a bit too much. He just happens to be an endurance swimmer like none other and someone who wanted to draw attention to the polluted waters around the globe. On April 7, 2007 Strel completed his perilous swim of the Amazon River, from Atalaya (Peru) to the Atlantic Ocean at Belem (Brazil). The marathon swim lasted 66 days and covered 5268 km (3274 miles). "This film is like art. It can stand forever for all the generations. This film is not a story about my power, my mission. This film is important for this world because now it's important. It's an inspiration for all the generations," Strel told AFP. As the long-swimming expedition moves deeper down the Amazon things begin to deteriorate. Arguments, concern for Strel's health and even a few crew members leave. But through it all Strel splashes onward as though he's in a war with his own demons and on a mission. "Here is power, in my mind, here is power," Strel said, pointing to his head. "People ask me, 'how it's possible to prepare body for so long swim?' You can't prepare body for so long swimming. You have to train a lot, you must be fit, very healthy. Teamwork is important. Then keep going. Tired or not tired keep going. Ill or not ill keep going. You have to go every day," said Strel. In addition to the exhaustive swimming each day Strel " who has also completed swims of the Yangtze, Mississippi and Danube rivers " suffered from sunburn, exotic stomach ailments and blisters. Strel's son Borut served as expedition leader for the big swim. He said the toxic waters and water predators were daunting for his father and the team, but the people were most challenging of all. The film chronicles the amazing swim in the Amazon river with unvarnished insight to the crews' challenges with keeping Strel healthy and their own inner soul searching for understanding at what they were witnessing. The crew numbered 25 persons from seven different countries. Strel's son Borut says the variety on the boat allowed each person to learn something new, "explore themselves" and contribute to the expedition. In addition to the powerful lessons about the environment and nature, Borut Strel said there is something more anyone can identify with. "The message of this film is individuals can go and try to do their dreams, their goals, even if they are not perfect," said Borut Strel. Matthew Mohlke served as navigator for the team but admits in the film he was not experienced for such a difficult journey. Mohlke did manage to navigate the waters well and found not only a good current for swimmer Strel, but inspiration for a book, "The Man Who Swam the Amazon."