Dramatic footage shows the grim hunt for the body of Peter Falconio.
The stills from a film to be screened in Australia reveal the new inquiry into what happened to the Huddersfield backpacker.
The hunt centres on a remote farming outpost in the Outback – 13 years after Peter’s disappearance – and in particular an old well on the site.
The man helping investigators, Paul Jackson, claimed: “I am 100% sure his body is down the well.”
Peter is thought to have been murdered in 2001 after being ambushed in the Outback with girlfriend, Joanne Lees, of Almondbury.
Drifter Bradley Murdoch was convicted of murdering the Holmfirth man in July 2001, but his body has never been found and Murdoch has always denied the killing.
TV investigators from the Today Tonight station, led by Frank Pangallo, have mounted a new hunt for Peter’s body.
They have tracked down Paul Jackson who believes a friend of his may have witnessed Murdoch disposing of the body.
The young British tourists were travelling north in their red VW Kombi, 300 kilometres from Alice Springs, in July 2001 when Murdoch allegedly flagged them down.
Joanne claims Peter got out, she heard a gunshot and then Murdoch threatened her with a gun and tied her up.
However, she managed to wriggle free and hid in the bush for five hours.
Mr Jackson said: “What are the chances a vehicle looking like Murdoch’s is going to be at that area, at that time, one hour and 20 minutes after the murder, which happened 2.5 kilometres away.
“One day the body will be found. Someone will walk across it, stumble across it or dig it up or whatever, but it’s there,’’ he said.
He took the TV team to Neutral Junction Station, where an old friend of his claims his attention was drawn to a parked vehicle by a well.
He was taking a short cut in his road train around 9.15 on the night of the murder.
Jackson said: “He saw this white vehicle with a black canopy on it and he had big headlights and spotlights on his vehicle and he slowed down – really slowed down – and he thought maybe they needed some help.
“He didn’t see anyone, he didn’t see anything; he just slowly cruised past.
“He had no idea that a murder or abduction had even taken place an hour or so ago on the highway.
“If you’re a killer and a pre-mediated killer, you’re not going to carry your body around for hours and hours on the road.
“You might get picked up by the highway police for speeding or drinking or whatever.
With the consent of Neutral Junction’s owners, Today Tonight went with Paul Jackson to explore the deep limestone bricked well on the site.
The team included experienced abseilers Ian Richards and Dennis Liddicoat, and respected forensic anthropologist Dr Kathryn Powell .
A camera lowered to the bottom revealed 12 years of silt build-up, enough to completely cover human remains, most likely by now skeletal.
However, recent heavy rainfall had raised the water levels of the once dry well fed by a nearby underground stream.
Before Today Tonight could attempt to retrieve silt samples for Dr Powell, a torrent of rain obstructed the mission.
Jackson said: “I am 100% sure that Peter Falconio’s body is down the bottom of the well, and I’m sure we will find the silver revolver that shot him in the back of the head.
Pangallo added: “I’ve spent so much time on this and I just don’t think I could possibly be wrong.”
The TV film will be aired in Australia next week.
Murdoch has lodged an appeal against the murder conviction.