A dad and his son were gobsmacked when what they reckon is a "great white shark" rammed their boat, as seen in a hair-raising video.
The chilling encounter happened in Tasmania, Australia, and was recorded by brave dad James Vinar who told ABC Hobart that he reckons the marine beast was up to four meters long.
In the clip, which was uploaded today, a man is knocked the ground when the speedboat jolts violently, leading him to shout: “Woah!”.
“What was that?” someone exclaims.
They then start to speed away in the boat, when suddenly what looks like a giant tail fin erupts through the waves before disappearing in a split-second.
Unsurprisingly, the footage has been watched thousands of times since it was shared on social media, with many people describing it as terrifying.
One commented: “Never getting back in the water!”
But other people debated over whether the apex predator was a great white shark or a killer whale (also known as orcas).
“That's a killer whale not a great white shark,” said one.
Someone else said: “It's a killer whale not a shark sharks are not that black.”
A third asked: “Since when do sharks tails move in that direction?
“Where's the rest of the footage?! It seems like everyone wants to see a shark now.”
But someone else comments: “It's a white shark 100%.”
“It's a white shark on it's side. A big one!” said another.
Also in Tasmania, a dad recently rescued his 10-year-old son from a great white shark after it pulled him into the sea from a boat.
This comes after a woman was tragically killed by a great white shark despite a heroic rescue effort from kayakers.