In the battle to save the Amazon's disappearing pink river dolphin, TV conservationist Richard Rasmussen is their greatest champion. But his willingness to do whatever it takes, whatever the cost, could destroy everything he's fought for.

Richard Rasmussen is Brazil's answer to Steve Irwin: a daring, charismatic eco-warrior with a wildly popular show on Brazil's National Geographic channel (20 million viewers and counting!) on which he uses his close encounters with nature's most remarkable and deadly beasts to highlight the need for drastic conservation action. But when a campaign to save the Amazon's endangered pink river dolphin erupts in scandal on camera, the blowback threatens to destroy Rasmussen's career and tear apart a tribal community.

A provocative and murky morality tale of modern media, activist ethics and unintended consequences, A River Below is the dazzlingly shot and deliberately discomfiting new feature from filmmaker Mark Greico. An unsettling counterpoint to the clean messaging and well-meaning optimism of the average nature doc, Greico's film will leave you shocked and awed – and ready to doubt everything in your Facebook news feed.

'Provocative … Functioning as a spiritual companion piece to Louie Psihoyos' 2009 The Cove, director Mark Grieco's documentary incisively examines the complications of engaging in a crusade via public TV.' – Variety

Contains images of animal death.