WE NEVER EXPECTED THIS! — Every hour counted as searchers tracked footprints, discarded toys, and a lone backpack 🐾😢. After a week in the Outback, police reveal a shocking new lead that could finally explain the disappearance of 4-year-old Gus Lamont… read more

It is every parent’s worst nightmare.

A small child, playing happily outside his home in South Australia’s mid-north, wanders off into the bush.

It was Saturday afternoon when Gus was last seen “playing in the sand like he normally does”, shovel in hand, wearing a sun hat, blue shirt, long grey pants and boots.

About 5pm Gus’s grandmother discovered the “adventurous” four-year-old was missing, sparking a more than week-long search in challenging conditions.

Vast expanse

It would be hard for many to comprehend the size of the sheep grazing property where Gus is missing.

Volunteers and police scoured rugged bushland for signs of the missing four-year-old.  (ABC News: Daniel Taylor)

The property is 6,000 hectares, or 60 square kilometres, and spans a complex mix of terrain.

The isolated homestead is about 40 kilometres south of Yunta, which has a population of 60 people, and is about 300 kilometres north-east of Adelaide.

It is only reachable by dirt roads, and according to police has six gates to get through to the property.

Police said the family began a desperate search at the property for three hours on Saturday before calling authorities, who put up a helicopter with infrared technology, but to no avail.

Gus was last seen playing outside his family’s homestead about 40 kilometres south of the remote town of Yunta.

On Sunday, police continued an extensive ground search using trail bikes, ATVs and a drone, scouring a 2.5 kilometre radius from where Gus was last seen.

Calls to SES volunteers were made to join the search and by Monday, water operations began to search dams and tanks on the property.

When the ABC arrived at the scene on Monday, reporter Bethanie Alderson said the terrain was deceptively challenging.

“The enormity of the sheep station hits you as soon as you arrive, with blue bush scattering the red dirt as far as the eye can see,”

she said.

“The only sign of its end is the blue, rugged peaks on the horizon. The beginning of the Flinders Ranges.

The bushland near the homestead where Gus was last seen in outback South Australia.  (ABC News: Justin Hewitson)

“The arid scrubland is laced with winding sandy tracks, which reveal hidden crevices and dry creek beds at almost every turn.”

On Tuesday morning, SA Police Commissioner Grant Stevens described the conditions as “challenging” and said there were “lots of places a small child might find themselves which would be hard for us to identify as easily as people may think”.

Later that day Gus’s devastated family released a statement, read by family friend Bill Harbison.

Bill Harbison, a friend of Gus’s family, said his disappearance came as a ‘shock.’ (ABC News: Daniel Taylor)

“This has come as a shock to our family and friends, and we are struggling to comprehend what has happened,” he said.

“Gus’s absence is felt in all of us, and we miss him more than words can express.

“Our hearts are aching and we are holding onto hope that he will be found and returned to us safely.”

The family also asked for privacy.

Search ramped up

On Tuesday afternoon a footprint was found, the first and only clue since Gus’s disappearance.

The footprint was found around 500 metres from the homestead where Gus was last seen. (Supplied: SA Police)

Soon after, a man with specialist tracking skills and a “close connection to the land” was enlisted to join the search.

As the hours moved on throughout the week, more resources were thrown at the search, including community volunteers.

By Wednesday morning police said it was preparing Gus’s family for the news that the search would soon enter a recovery phase.

“We always hold out hope that he’s a tough lad and he’s crawled under a bush and he’s still alive but we’re just preparing the family for the fact that we may be moving from a search effort to a recovery,” Superintendent Mark Syrus said.

A tracker was called in to help in the search. (ABC News: Daniel Taylor)

The same day 40 cadet police officers joined the search and major crime detectives arrived, but police were quick to say there was “no suggestion of anything suspicious”.

“As any part of any search there’s an investigational process so they’re just doing their due diligence,” Superintendent Syrus said.

By Thursday, almost 50 ADF personnel arrived to assist.

But after nearly a week of searching, police announced they would scale-back their efforts on Friday.

Assistant Commissioner Ian Parrott said police were hoping for a “miracle'” to find Gus alive and well but had found no clues leading to his whereabouts.

Assistant Commissioner Ian Parrott said the search for Gus has been one of the largest searches in South Australia in recent times. (ABC News: Lincoln Rothall)

“The search for Gus has probably been one of the largest, most intensive searches for a missing person conducted in South Australia in recent times,” Assistant Commissioner Parrott told the media on Friday.

“Unfortunately, at no point has there been any significant evidence that has enabled us to really focus in a direction for our search.”

He described Gus as an “adventurous and shy” child with an “angelic face” whose disappearance has been “upsetting” and “traumatic” for the family.

“Life is not supposed to work where a parent loses a child, it’s supposed to work the other way around,” he said.

Community efforts praised

At the heart of the search has been a community effort, which has included locals, friends and volunteers.

ADF personnel and police cadets were joined in their search by members of the community.  (ABC News: Justin Hewitson)

A food truck business from nearby Peterborough drove up during the week to provide sustenance to those assisting the search effort.

While the search has been buoyed by support of local community members, and authorities from throughout the country, hopes throughout the week of finding Gus have been slipping away.

Assistant Commissioner Parrott praised the “unwavering commitment” of those who joined the search, especially the community that rallied around the family.

“That community spirit has really shone through this process, as has the outpouring of sympathy and acknowledgement from the broader community of South Australia,” he said.

Assistant Commissioner Parrott said an ‘astronomical’ amount of resources had gone into the search.  (ABC News: Daniel Taylor)

While the police presence at the family homestead has grown quieter, Assistant Commissioner Parrott said investigators are still pursuing ongoing lines of inquiry.

“[We] will not rest until we can try and find the answer to why Gus has gone missing.”