Mr Megaw said Serious Crash Unit officers from Wellington had completed a preliminary examination of the crash scene and an investigation was ongoing.
Ngawi Rural Fire Party volunteers were the first emergency team to the site and a doctor on holiday at the settlement had given first response care to the injured passengers, he said.
Mike Lace, Martinborough firefighter and officer-in-charge, said volunteer fire crews from the South Wairarapa town and Greytown were also scrambled to the scene and all three passengers were out of the rolled vehicle by the time the rescue tender from Martinborough arrived.
"A cut out was not required and firefighters controlled traffic, ensured the scene was safe and assisted police to protect the site for their investigation."
Life Flight Trust crewman Dave Greenberg said the Westpac Rescue helicopter with a Wellington Free Ambulance paramedic on board had arrived at the crash scene within 25 minutes of launching in the capital.
"On our arrival we found a local doctor and the fire brigade attending to three young guys who had been in the ute that rolled. The young guy who said he was the driver was a bit shocked by it all but was fine and there wasn't anything too wrong with the other guy, who had his chest bandaged," Mr Greenberg said.
"The doctor played a huge part with the local fire crew in keeping the seriously injured guy alive until we arrived."
Mr Greenberg said the 22-year-old had been airlifted to Wellington Hospital in a critical condition.
The other two occupants were taken to Wairarapa Hospital for assessment and treatment and were discharged early yesterday morning.
The young man was yesterday morning listed in a critical condition in the intensive care unit but was showing signs of improvement.