A Sydney harbour became reminiscent of a horror ... Investigators traced the flowing blood red water back to a drain, leading them to believe that a plumbers’ dye called Fluorescein had caused ...

Water near the world's largest steel ... The ominous-looking waves of red were spotted by passersby on Sydney's lower north ...

The source of sewerage continuing to stream into the city’s harbour remains a clouded issue. Here’s the latest on investigations as authorities work towards a “swimmable city” by 2050.