An independent review is under way to assess whether to search further for missing Dutch tourist Ken Boogers, police say.
The 26-year-old was last seen in Golden Bay on Saturday morning
He had said he was going for a walk on the Hilltop Track and was last seen on Pillar Point track, between Wharariki and Puponga.
Police said he was wearing only a t-shirt and shorts and had bare feet.
Navy vessel HMS Hawea joined the search yesterday, covering an area from Farewell Spit to southwest of Wharariki Beach. Four ground search teams were also out.
Search co-ordinator Sergeant Michael Fitzsimons said Mr Boogers would have spent the past five nights in the open, and the chances of surviving were not good.
He said no trace of him had been found and the review was considering what options are left for searchers.
Mr Boogers' parents have now arrived in New Zealand.