Tunnelling in Auckland that will ultimately lead to cleaner water

A massive piece of machinery will soon be digging and boring a tunnel in Auckland to divert wastewater and stormwater from inner city suburbs to the Māngere Wastewater Treatment Plant. Watercare's Central Interceptor project involves a 15 kilometre pipe running underneath the Manukau Harbour and finishing in Grey Lynn. It's the biggest wastewater infrastructure project to date which will create the longest bored tunnel in the country.Watercare Central Interceptor executive programme director, Shayne Cunis talks to Kathryn about the the $1.2 billion project, due for completion in 2025.