Chilling drone footage

Filmmaker Dave Riggs captured the ferocious predator approaching the boat just 150ft from the shore on Fourth Beach at Twilight Bay, Australia.

It shows the giant beast swimming around the boat in what could be a pre-attack routine.

Mr Riggs, who has filmed shark documentaries, said the boat was approximately 28ft-long – meaning the shark was roughly 20ft.

Posting the footage on Facebook, Mr Riggs used it to draw attention to increased shark sightings in the area.