A man and two boys clinging to a sink boat have a floating VHF radio to thank for their miraculous survival.
The man in his 30s and two nine-year-old boys were in their five-metre fibreglass boat in Mandurah, Western Australia, when a massive wave swamped them.
After 20 minutes in the water, with the boat partially submerged, the trio were desperately clinging to the bow of the vessel - when the hand-held radio floated free from the vessel.
The man was able to grab it and make an emergency radio call. This broadcast was received by Peel Water Police and Mandurah Marine Rescue.
About 20 minutes later, an EPIRB in the vessel floated free and this enable rescuers to hone in on the trio's position.
Police Air-Wing and Water Police officers along with Mandurah Marine Rescue were involved in Saturday's rescue.
Officers in the police helicopter spotted the trio in the water about 18km west of the Dawesville Cut, an artificial channel between the Peel-Harvey Estuary and the Indian Ocean at Dawesville, about 80km south of Perth.
Peel Water Police officers pulled the trio from the water and provided first aid.
They were taken to the Peel Health Campus for treatment of hypothermia and jelly fish stings.