The hunt for four men missing in four separate incidents across New Zealand continues today.
Police and families are continuing to try to work out what happened to the men, missing from Hamilton, Marlborough Sounds, Nelson Lakes, and the West Coast of the South Island.
Today, police search teams are continuing to search around Greymouth for Christchurch 30-year-old, Kurt Millan Green, last seen in the Blaketown beach area on Sunday, March 9.
A ground search yesterday in the Blaketown beach area did not produce any significant findings, police said.
Detective Sergeant Sarah Illingworth of Christchurch police said search teams were likely to return to the area north of the Grey River today to do a further sweep of the area.
Helicopter or aeroplane support may also be brought in to assist the search in some of the more difficult terrain.
"We are continuing to appeal for any sightings of him, or for any information about his whereabouts," Ms Illingworth said.
"This remains a missing person enquiry and we simply do not know what, if anything, has happened to Mr Green."
She said a number of calls have been received from members of the public in response to publicity about the case over the past 48 hours, but no firm leads have emerged.
Meanwhile, a large manhunt in Hamilton is into its fourth day.
Residents have been urged to check their gardens, sheds and outbuildings for any sign of missing dementia sufferer Trevor Smith.
The 70-year-old from Kawhia was last seen on the ramp leading to the public entrance of Waikato Hospital about 5pm on Sunday.
Police have set up a kiosk at Waikato Hospital where Mr Smith's picture is on display.
There is also a mannequin dressed in a distinctive, green Vodafone Warriors NRL rugby league jersey, the same type Mr Smith was wearing when he was last seen.
Detective Senior Sergeant Ross Patterson, who is leading the enquiry, said they were relying on the public reporting sightings of him.
"A member of the public sighted Mr Smith walking beside the median strip on the wrong side of the road on Cobham Dr, heading towards Normandy Ave.
"We don't know if anyone stopped to talk to him or picked him up but if you did, police would very much like to speak to you."
About 40 police and land search and rescue volunteers are involved in physical searches while 15 detectives are following up on sighting reports they have received.
Mr Smith is described as being clean shaven with a number one haircut and of average to solid build. He was last seen wearing the Warriors jersey, dark blue track-pants, plain white sandshoes and a grey cap.
The key to working out what happened to missing boatie Kerry Blair, 55, last seen on March 8 when he launched his boat in the Marlborough Sounds, could lie in a forensic examination of his boat.
His nine-metre aluminium launch, Erie, was found 200km off the Taranaki coast on Friday.
It's been taken out of the water at Port Taranaki and is undergoing forensic and mechanical examinations to try and work out what happened to the commercial fisherman.
Mr Blair's brother Peter told APNZ this week that while some members of the family were clinging to hope that he would still be found alive, he said he had personally "sort of accepted Kerry has gone".
The search for missing German tourist Christian Prehn was scaled back almost two weeks ago.
His backpack, full of gear and personal items, was found on March 1 beside a track in the Nelson Lakes National Park, but police believe it may have been there since February 25.
Search co-ordinator Senior Constable Dave Colville said the operation had now gone into a limited continuous search phase, meaning further ground searches would activate only when new information came to light.
* Kurt Millan Green: If anyone has seen him, or has information about his whereabouts, should contact Christchurch police on 03 363 7400 or Greymouth police on 03 768 1600.
* Trevor Smith: Police are asking that if anyone sees someone matching Mr Smith's description to contact them by ringing 111.
* Kerry Blair: Anyone with information relevant to this investigation should call Blenheim Police on 03 578 5279.
* Christian Prehn: Anyone with information that may assist this search should call Nelson Police on 03 546 3840.APNZ kb lb