The search for evidence at the former home of missing Sydney woman Lynette Dawson will continue over the weekend and early into the week.
Ms Dawson was 33 when she disappeared from the northern beaches in 1982 leaving behind two daughters.
Investigators started to dig on Wednesday at Ms Dawson's old Bayview home where she was living with her husband Chris Dawson - who has long been a suspect in the case.
The former Newtown Jets rugby league player denies any involvement in his wife's disappearance.
"We will go until we hit rock," Homicide Squad Commander Detective Superintendent Scott Cook said on Wednesday.
Australian Associated Press