Authorities are yet to find the fourth victim of a light plane crash off Victoria's surf coast.
Police believe the body may be trapped in the wreckage of the Piper Cherokee plane that plunged into the sea on Friday afternoon.
An extensive search in Bass Strait off Point Lonsdale continued on Sunday, but the fuselage of the light plane has not yet been found.
Three bodies were recovered within hours of the crash.
Inspector Graham Banks of Geelong police says it's likely the fourth is trapped in the wreckage, about 30 metres below the surface somewhere in a 500m by 500m search area.
"(The search area) might grow if we don't find the plane in that location," he told reporters on Saturday.
Police have not named the victims but it's believed they are Daniel Flinn, 55, Donald Hateley, 68, and Ian Chamberlain and his partner Dianne Bradley, both in their 60s.
The three men are all licensed private pilots, but it's not yet clear who was flying at the time of the crash.
All four on board were reportedly keen members of the flying community.
"He was an avid pilot, and that was his passion," Mr Flinn's brother Tom told The Age.
Police divers and searchers using sonar equipment returned to the crash scene on Sunday, and a water search of the area will continue until nightfall.
The aircraft was flying from Moorabbin Airport in Melbourne to King Island in Tasmania.
Emergency crews were alerted about 12.30pm on Friday after a fisherman out at sea noticed the aircraft was in trouble and crashed into the water.
