Now, though, I've been sent extraordinary footage that leaves nothing to the imagination.

This footage was shot at on aquarium in Seattle.

In Pacific Northwest, something was killing off their shark, so they staked out the tank with camera to record any evidence.

As a zoologist.

My natural reaction to this, other than amazement, is to ask if an octopus can catch consume a shark.

Could a large one take down on devour a person?

I've uncovered a report from a man who has no doubt about based on terrifying personal experience.

I've got to find out I'm taking a flight to Washington State's Puget Sound to meet a man who had a terrifying encounter.

Known species of octopus says he's lucky to be alive.

I've been diving Puget Sound since the eighties.

I've encountered many different octopus, but the one encounter of the biggest Oh my mind is I was working in northern Puget Sound.

Ron was dive fishing for sea cucumbers to sell to the fish market when he came across something far bigger and much more valuable, so I was going the bottom, picking up with sea cucumbers in between two large rocks.

I see a huge octopus and I went $5 a pound.

So I grabbed The Octopus, and immediately it tried to get away.

And next thing I realized he'd pulled me up about 10 foot off the bottom that I had still had a loving always said The octopus arms went all the way around me.

And all I feel was the beat on top of my head.

The mass started squeezing over to one side every such a cup that I could feel against the suit, my hands, my face I could not get away.

And far as I knew, I could drowned right that moment.

One continue to find the Octopus as his fishing problem was pulled into the surface by his tether.

So once you go to the surface, it took three of you to get it under control.

It really took a long time.

Eventually we got it up on the board.

You, when we're through with you, you were able to get it in the plastic box.

Yes, to live on £50 of way.

Don't top of that.

But the Octopus actually pushed the lid up over the side.

I've heard some stories from the Atlantic off.

People being clutched from the surface remains not being found.

Do you think that could potentially be octopus?

I'm sure the more I hear about these giant Octopus, the Maur formidable they are.

If they are so stealthy, intelligent and powerful that bacon pluck shark from the water column and devour it, Then what chance is a human being got in an underwater struggle?

Unless you're really lucky, like Ron was, there's only one way that's going to end.

Dark icy waters of Puget Sound are a far cry from the tropical archipelago, but both places are home to a number of octopus species which share the same predatory.

For my best chance of an octopus encounter.

On using a re breather unit, this'll circulates and refreshes the air.

I'm breathing without the release of bubbles helping me to stalk a giant octopus without being noticed.

It's another very challenging dive, and I struggled to adapt to the low light.

These dark deaths are home to some truly bizarre creatures.

Oh, okay.

This is well, don't look it.

What?

I'm uncertain, right?

anything you find wedged into the smallest places.

What a weird, weird, weird looking thing.

So something lives here for the look of this way we've got here.

Looks like it is enough to understand a thing is not to be deceived by the size of the thing.

Well, this is the Giant was having with the largest known species of octopus and certainly the biggest octopus I've ever encountered.

It's not showing any signs of aggression, but it is in no way intimidated by our presence or our lights.

A creature like this would have no difficulty overcoming working passageways disappear and then reappear again.

Very impressive.

Incredibly, the octopus that seized Ron would have dwarfed this spanning between 15 and 20 feet.

Grow bigger than this.

But this is an impressive animal When it goes from walking to swimming.

This shape shifter does indeed look somewhat shark like.

Is this how the hybrid legend originated?

Intelligence.

Aggressive, opportunistic and incredibly maneuverable, this secretive giant is a super quite a predator, really makes you think.

I think it's much of a blue home could be looking at those premises down.

If the roles of Andros were indeed to harbor a giant octopus.

It's easy to understand how it might have remained hidden on towel in the labyrinths of the human imagination.

This extraordinary creature could have inspired the legend of Moscow.