Searchers have found no sign of a 19-year-old tourist, whose tramping pack was found abandoned in Nelson Lakes National Park.
Search teams spent today in the Travers Saddle area, searching for missing German Christian Ulf Erik Prehn.
The search has concentrated in the area his pack was found but searchers found no trace of Mr Prehn. A helicopter and a dog team have returned to base and two ground teams are spending the night at the Travers Hut. The search would continue tomorrow, weather permitting, search coordinator Senior Constable Dave Colville said.
He said several people who had been in the area have spoken with police but so far none had information about Mr Prehn's intentions.
Police would like to speak to a German woman called Angela Bahr who is believed to have spoken with Mr Prehn at one of the huts.
Mr Prehn arrived in New Zealand in October on a one year tourist visa.
Inquiries by police indicated the pack - which was full of gear and personal items - may have been there for up to a week before it was recovered.
Heavy rain was expected tonight.
His parents, who are in Germany, have spoken with police in New Zealand.
Anyone with information that may help this search should call Nelson Police on 03 546 3840.