Thanks to 13,000 bolts the new water reservoir in Frimley is slowly rising, part of an $82 million upgrade.
Currently, the reservoir is the highest-profile part of Hastings' new water infrastructure and will hold eight million litres of treated water.
Work has started on the corner of Southampton St West and Hastings St South in central Hastings, where 10 million litres will be stored.
Existing above-ground storage in Havelock North is for 20 million litres.
The water infrastructure upgrade is part of a five-year journey by Hastings District Council to ensure future generations will have clean water.