Work on billionaire Graeme Hart's enormous new yacht at the Wynyard Quarter is under way in what could be New Zealand's largest marine refit.
The country's richest man had the hulk of the Weta - or U77 - brought from Chile to Auckland.
Weta's portholes were welded before its 9698km transpacific journey, so work being done inside is kept secret.
Luxury yacht charter firm CharterWorld said the yacht required "complete interior and exterior fitting and will be one of the largest superyachts ever to be fitted out in New Zealand".
"Little else is known about the project, such as the yacht designer or naval architect," CharterWorld said.