The search for missing Dutch tourist Ken Boogers entered its third day this morning.
Mr Boogers, 26, has not been seen since Saturday, when he was walking on the Pillar Point track between Wharariki and Puponga in Golden Bay.
Three ground teams with specialist search dogs were working in the area this morning, police said.
Search coordinator Sergeant Mike Fitzsimons said there was growing concern for Mr Boogers' welfare.
Despite extensive searching by land search and rescue personnel and police, there had been no sign of him.
Police would like to speak to anyone who has seen him since Saturday. Phone Nelson police on 03 546 3840 or Takaka police on 03 525 9211