While installing a septic tank in the backyard of a Hazelwood Court residence in Silverleaves, plumbers made a startling discovery—a skull and vertebrae—around 8:30 a.m.

Greg, the homeowner, and his wife acquired the property on the quaint island three years ago, making it their cherished retreat.

“This is our vacation haven, and we absolutely adore it. The area is stunning, and we hold it dear,” Greg shared with 9News.

“When we checked the backyard, it was quite evident what the plumbers had unearthed,” he recounted.

Reports from 9News indicate that the remains are those of an adult and may have been buried there for a considerable period.

Local resident Olympia expressed her dismay, saying, “It’s heartbreaking to think that someone lost their life in such a picturesque beach area.”

Forensic officers spent the day sifting through backyard soil on their hands and knees, while detectives from the homicide and missing persons squad went door-to-door searching for clues.

The state’s top detectives are now looking at whether the discovery could be linked to a high-profile cold case.

“You go through quite a range of emotions, from disbelief through to shock,” Greg said.

“I’m hopeful that it’s somebody’s very sad story, which will now come to closure.”

The area where the remains were found is not within a known Indigenous burial site.

The remains will undergo forensic testing, which could take weeks or even months.