An amateur drone pilot captured the moment a shark approached a surfer at Werri beach in Australia on Sunday.
Christopher Joye used a search and rescue drone equipped with infra-red thermal imaging camera and a warning speaker system.
"I was patrolling on Sunday and saw this large shark circling a surfer. I raced in an blasted out the alert message, blaring "Shark! Shark! Shark! Evacuate the water immediately!", Mr Joye told Reuters as he explained the how the shark was spooked by the swimmer that rapidly turned towards the beach.