Queensland police divers will search Lake Awoonga at Gladstone for any trace of Chantal Barnett and Robert Martinez following a public tip-off.

A lake in central Queensland may hold the remains of a couple who have been missing for more than a year.

Police divers will soon search Lake Awoonga at Gladstone for any trace of Chantal Barnett and Robert Martinez following a public tip-off.

Detective Senior Sergeant Scott Moon says the Rockhampton couple were last seen in late February or early March last year.

Police believe they were murdered.

Det Sen Sgt Moon called for anyone with information about the whereabouts of Ms Barnett and Mr Martinez to come forward.

“We are very confident that people residing in Rockhampton know what happened to Robert and Chantal,” he said in a statement.

“Regardless of how trivial you think the information might be, please come forward and speak with police.”

Tip-offs from the public have led to officers to scour the slopes of Mount Morgan, deep gorges around Mount Archer and a site near Port Curtis.

Each time they found no trace of the missing couple.