She was reported missing on Saturday, March 23.
"Unfortunately, the man has not yet been located and police are providing support to his family."
The diver was reported missing from a vessel off the coast shortly after 1:30pm.
"We still have no news. Nothing. Just speculation. A nightmare. We want to wake up."
William, 17, was last seen on February 19.
The man, in his 70s, had been missing since Monday.
Twenty-three-year-old Cortney has been reported missing.
Papanui Point has been described as "a location known to claim lives".
Police and the woman's family have concerns for her safety and wellbeing.