Drone footage shows the Corfo lagoon in the Chubut province, which has been tinted pink because toxic waste from fishing has been dumped into it. Experts and activists say the pollution is caused by a chemical used to preserve prawns for export. The colour is caused by sodium sulphite, an antibacterial product used in fish factories. Local residents have complained about the foul smells and pollution concerns around the Chubut River that feeds into the Corfo lagoon. In protest against the continued pollution, locals have blocked roads used by fish waste trucks from entering the area