It's one of the jewels in the City of Sails' tourism push - but what lies beneath the Auckland Harbour is a very dirty secret.
A Herald Focus and Weekend Herald investigation has revealed that 1 million cubic metres of waste water and raw sewage - the equivalent of 400 Olympic swimming pools - is pouring the harbour each year.
The waste is flowing into the harbour from 41 points around the inner city suburbs almost every time it rains.