Watch Sharkwater Extinction for Free: How to Stream the Movie Online at 123Movies. . Discovering that sharks are being hunted to extinction, and with them the destruction of our life support system - activist and filmmaker Rob Stewart embarks on a dangerous quest to stop the slaughter. Following the sharks - and the money - into the elusive pirate fishing industry, Stewart uncovers a multi-billion dollar scandal that makes us all accomplices in the greatest wildlife massacre ever known.