Mr Saxton, a popular 31-year-old South Westland pilot, has not been found despite shoreline, aerial and lake searches.
Police suspended the searches about 3pm yesterday, pending the arrival of navy and police deep-water dive specialists and their remote-controlled vehicle.
It is hoped the divers will be able to confirm whether Mr Saxton is in the helicopter or not.
A navy Hercules aircraft arrived at Wanaka Airport at 7.45 last night with seven navy divers, five police divers and several truck and trailer loads of equipment.
Civil Aviation Authority safety investigator Colin Grounsell leads a team of three CAA investigators who arrived in Wanaka on Sunday night and began working on salvaged helicopter wreckage yesterday.
Mr Grounsell said their task was to carry out a full and independent investigation to try to determine the cause of the accident.
The investigation procedure required them to look at mechanical issues to do with the helicopter, to assess the environment and weather, which had been good on Saturday, and to consider the pilot himself, Mr Grounsell said.
They were looking at the signs of damage on the items recovered on Sunday and were keen for more of the helicopter to be recovered.
Mr Grounsell confirmed the helicopter everyone is looking for is a black Robinson 22 Alpha, call sign HXR, which Mr Saxton's company Heli-Pest Ltd acquired in December 2006.
"If you liken it to a jigsaw puzzle, we only have very small pieces . . . It is too early because we don't have enough information available," Mr Grounsell said.
He said it appeared from the damage to a fuel tank the helicopter had not had a controlled descent into the lake and had hit the water hard.
A floor mat, foam seat squabs, the helicopter cover, a first-aid kit, helmet and some personal items belonging to Mr Saxton, including a jacket and backpack, were also among the salvaged items found on Sunday.
Const Emma Fleming said yesterday it was believed Mr Saxton was not wearing the helmet or the jacket that had been found by searchers.
He would have been wearing a head-set, which had not been recovered, Const Fleming said.
"The Saxton family extend their gratitude for the generous assistance of Morgan's close friends, Search and Rescue, the police, navy and the many people involved in the tragic circumstances of Morgan's helicopter accident" a spokesman for the family said last night.
"The family thank the New Zealand public for the overwhelming support."
The family returned to Haast yesterday.
