Designed to reduce overflows and help make Auckland’s waterways cleaner
It will be the longest tunnel in NZ once completed, at 14.7km
With a 4.5m diameter, it will take six years to drill. Work began in August 2019
The tunnel will run underground from Grey Lynn to the Māngere Wastewater Treatment Plant with several link sewers and shafts along the route for collecting and transferring wastewater
Resolve Group provided risk management support to Watercare to identify and analyse key procurement and delivery risks