The investigation began with an initial search that involved specialist dive teams, and the operation was renewed on December 21 to intensify the efforts.

Graf was last seen driving a white 2012 Ford Territory (registration S254BCX) in the Roxby Downs area in the early hours of a Friday, with the vehicle found abandoned near Blue Dam the following day and unable to be driven.

The search now includes expanded ground and air efforts, with a new aerial sweep planned to cover the area between Blue Dam and Andamooka, extending beyond earlier zones around Roxby Downs.

In South Australia, authorities renewed the search for missing 41-year-old Trisha Graf near Andamooka after she hadn’t been seen for more than two weeks, with grave concerns for her welfare.

Graf was last seen in the Roxby Downs area, about 510 kilometers north of Adelaide, in the early hours of Friday, December 12.

A large-scale operation including air and ground teams and specialist dive units has been conducted without locating Graf or any sign of her whereabouts.

Authorities say they have grave concerns for Graf’s welfare due to her extended absence and the circumstances surrounding her disappearance.

Authorities are appealing to the public for information about Graf’s movements or whereabouts and are directing inquiries to Crime Stoppers at 1800 333 000 or crimestopperssa.com.au.