It looks like one of the most terrifying beasts of the deep – the Giant Pacific Octopus can be 20feet long and reach speeds of up to 25mph.
Each of its eight arms has two rows of suckers, which can be used to form a terrifying parachute to catch its prey.
In the centre of its gigantic body is a huge mouth, which horrifyingly contains a toothed-tongue.
The Giant Pacific Octopus is happiest more than 6,000 feet below the surface of the ocean, swimming among the dark and murky depths.
Using its arms as legs, the ocotopus can also crawl slowly along the bottom of the sea and despite its giant size, this octopus can fit into incredibly small spaces.
In fact, anything that’s slightly bigger than then beak in its mouth – the only hard part of the octopus’s body – can be slunk through as its whole frame can compress.
With three hearts and blue blood it sounds like something that would be more at home of the pages of a science fiction novel than easily available for humans to view.
But one aquarium in Seattle in the US has one of the massive creatures as an attraction – and people working there noticed something strange was going on.
The Seattle Aquarium also has a population of dogfish sharks and those working there couldn’t understand how so many of them were disappearing, with partially mutilated corpses all that was left behind.
That was until they examined what their Giant Pacific Octopus was up to.
After setting up cameras to film overnight, they realised the huge beast was as terrifying it seemed – and was methodically killing any sharks that came near it.
The octopus would wrestle the sharks, often turning them upside down so they become paralysed, and then gorging on their flesh before it had enough of their bodies and dumping them before moving on.
It’s not the first time that octopus have made a dogfish shark their dinner – but it seems the Seattle Giant Pacific had some additional help.
The aquarium enlisted the help of documentary makers to film what was happening on site overnight.
And it turns out they ‘herded’ the dogfish sharks into the path of the octopus – and certain de̳a̳t̳h̳.
Underwater photographer and filmmaker, Michael deGruy, explained he had originally been interested in filming in the aquarium so he could observe how octopus look after their eggs.
But after hearing staff had moved the dogfish sharks into another tank to keep them safe, he wanted to see what the octopus were actually capable of.
Here is the detail video: