Six months after they went missing, Victorian police have renewed calls for assistance in the baffling case of Wonnangatta campers Russell Hill and Carol Clay.
Missing persons squad chief Detective Inspector Andrew Stamper said police were still hopeful of getting answers for the Hill and Clay families.
"Six months is a long time to be waiting by the phone for information, however, police haven't given up," he said.
"When the weather allows, our investigators and specialist search teams will return to the area to conduct further searches in the hope of finding any clues about what has happened to Russell and Carol."
Mr Hill left his Drouin home on March 19 and collected Carol from her home in Pakenham in his white Toyota LandCruiser.
They then travelled through Licola, spending one night at Howitt High Plains before heading into Wonnangatta Valley on March 20.
Mr Hill was last heard from on that day over HF radio while Ms Clay had told friends she was heading away and was expecting to return by March 29.
Police are still keen to speak to anyone who was in the Wonnangatta area around that time, including campers, day-trippers, hunters, people fishing, or trail bike riders, regardless of whether they saw or heard anything.
Detectives are also keen to speak to anyone who was in the area of Howitt Plains and Zeka Spur Track on March 19 or 20, and the Wonnangatta Valley and Wonnangatta Station between March 20 and 24.
Investigators have been told that Mr Hill took his drone with him but it is yet to be recovered.
Campers found his vehicle with signs of minor fire damage at their campsite, which was completely burnt near Dry River Creek Track in the Wonnangatta Valley on March 21.
Det Insp Stamper said it was yet to be determined if their disappearance was suspicious.
"We know there were vehicles in the area at the time with Victorian, NSW, Tasmanian, Queensland and South Australian registrations, so potentially there are people now interstate who have some information or need to contact us," he said.
"Although six months have passed, police still believe that we can solve this but we need the public's help."
Australian Associated Press