UPDATE: Police divers have located the body of a man in a dam on the property where an extensive search has been under way for a missing Italian backpacker.
Speaking at the scene, Detective Acting Inspector David Briese said police had been overseeing the investigation with search and rescue co-ordinators, SES and Careflight.
"The investigations to date have centred around searches of this area," he said.
"Today police divers were brought in, they have searched a body of water, and uncovered a male person."
Det Act Insp Briese said police did not believe there were suspicious circumstances surrounding the man's disappearance and death, but an autopsy in coming days would seek to find out for sure.
Police have praised the efforts of all those who helped in the search, particularly the SES, who have been searching since Monday.
"They leave their day jobs to assist us and they have searched high and low," Det Act Insp Briese said.
JULY 21: Police divers will search the dams on a citrus farm near Childers tomorrow as the search for a missing backpacker enters its third day.
Italian national Ilario Viviani was last seen about 7.30pm on Saturday when he wandered off from a campsite on the property where he was working and staying with his girlfriend.
The 26-year-old has not made contact with family or friends since and concerns are held for his safety.
Police are also investigating whether Mr Viviani got into a car on Saturday night.
Sketchy CCTV footage has emerged of a vehicle at a service station at about 7.30pm on Saturday but it's inconclusive whether Mr Viviani is one of the occupants of the car.
Police are urging any information to contact Crime Stoppers on 1800 333 000.
EARLIER: More than 20 SES personnel have joined the search for a missing backpacker at a rural Childers property.
Italian national Ilario Viviani was last seen at the Isis River farm, on the Bruce Hwy, about 7.30pm on Saturday.
SES personnel from Gin Gin and Childers joined police who initiated the search for the man after he was reported missing Sunday afternoon.
An air and ground search of the area, including a neighbouring national park, late Sunday failed to locate any signs of the man.
Early yesterday morning a land search continued and more personnel were expected to join the search and continue until daylight ran out.
Senior Constable Grant Klassen said the 26-year-old man wandered off from a campsite and hadn't contacted family or friends.
He said the property was about 100ha and resources on the ground had been concentrated on clearing it before the search was expanded.
Concerns are held for his welfare as it is out of character not to stay in contact.
Mr Viviani is described as Caucasian in appearance, 185cm, with a slim build and light brown hair.
He was last seen wearing sunglasses, a grey Billabong shirt, a blue Van's jacket, blue jeans and grey Volley shoes.
Mr Viviani also has a tattoo on his left shoulder of tribal art and tattoo on his right shoulder of his grandfather's name.
Police are asking anyone who has seen Mr Viviana or has any information about his whereabouts to contact Crime Stoppers on 1800 333 000.