Police are investigating a single-vehicle crash that left a car on its roof near Waroona Dam in the early hours of Friday morning.
About 7.45am on December 28, the crash was reported along the northern bank of the dam near Invarell Road.
After arriving on scene, neither Police or the Waroona Volunteer Bushfire Brigade could locate the driver or occupants.
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A WA Police spokesman said officers at the scene believed the crash could have occurred several hours prior to being reported.
Brigade members have flipped the vehicle back onto its wheels and are cleaning up fuel that leaked from the carnage.
Anyone with information regarding the crash are urged to call Police on 131 444 or contact Crime Stoppers via 1800 333 000 or make a report online.