The Labour Party Government wants to build twin tunnels under the Waitemata Harbour as an alternative to the current Auckland Harbour bridge.  It would be partially replaced by two tunnels, one in each direction, for private vehicles and another set of tunnels for light rail between Albany and the city center, to be built much later.  Overall the plan will take decades to complete and will cost tens of billions of dollars.  Construction on the vehicle tunnels has a targeted start date of 2029 and will cost as much as $15 billion dollars.

https://www.interest.co.nz/public-policy/123472/government-touts-four-multi-billion-dollar-tunnels-under-waitemata-harbour

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