Huge Waste Water Tunnel Begins Under Manukau Harbour
September 16, 2022
The 15km pipeline is being dug by a boring machine, creating a tunnel with a diameter of about 4.5 metres - about as high as a giraffe and as wide as four rhinos.
The tunnel boring machine began its journey in Māngere in September 2021. It has travelled 2.5km and is currently sitting 25 metres underground.
The corridor will run from Mangere all the way to Grey Lynn. Right now its biggest task is passing under the harbour, 15 metres below the sea bed.