And what's interesting is that these fish are very unlikely villains.

We're not talking about the cold water sharks but giant halibut.

And I have to say, this is definitely a fish that I need to encounter myself.

The largest specific halibut ever.

Court was just under £500.

That's nearly three times what I weigh.

And therefore rations, predators, salmon, squid see girls and even seals have been found in their stomachs.

If you're in a small boat and you hook, one of these giant flatfish is possibly know the halibut that's going to end up as dinner.

Now, with this new suspect on my radar, I want to find out for myself how strong this beast really is.

Fishermen here just don't tangle with large live halibut, But I want to get a good look at this creature and then put it back alive.

This region around here looks a little bit like Jurassic Park.

Amazing fishing spot.

Very hard to believe.

That could be halibut here.

This isn't very deep.

I was going to say I can't wait to get a line in the water.

But what I've heard about some of these fish it's one of those moments where you're slightly hesitant about the process as well.

I'm using a large plastic jig on £100 braided line on dropping it onto the seabed.

Just 30 feet below the sea floor is the halibut domain, and I'm hoping to tempt a monster onto my line.

Yeah, so it doesn't take a long something on my own.

This is no big, but it's something on there.

It's not what I'm looking for.

It's a rockfish, one of the creatures I first saw when I was looking for sharks underwater, trying to rockfish a lot of fish showing up on the sonar.

So this was mid water, took the the flashing jig on the way down.

They're some of the longest living fish in these waters, reportedly reaching over 120 years old.

I want to quickly get this one back into these shallow waters.

Bye, reset.

And once again, after only a few minutes, I pull an unexpected but very curious creature.

Up to the surface.

Thing is a ling cod.

It's not a type of ling or even a card, but actually a green ling.

It looks a little bit similar to the snakehead I was after in Thailand.

Sharp teeth in that.

And just like the snakehead, it's a voracious hunter, impressive looking beast.

These smaller predators all attacked the lure with a similar bite.

But when I feel a much more savage pull on the line.

No, I know that's a halibut has taken the bait far off the second that hits the bait fish takes off with a turn of speed that catches me off guard turned into quite a powerful dive.

I'm getting a very disconcerting and characteristic knocking on the the road way These fish swim.

It's sort of up and down down movement.

Bringing this fission is going to be on almighty struggle.

Let's focus eyes way already.

I want to get this fish on board without injuring it.

I'm gonna go and just listen.

So what's the road, please?

All right, put down the gun.

Right.

It seems calm now.

Shall we go for it?

Okay.

Really?

Also Finn's language.

Okay, this is a big gala, but this is 120 pounds.

Heavy to lift.

Heavy to bring in on having seen this thing thrash on the surface, I can absolutely believe those stories when they kick off in a boat.

Damaging people we tend to think of flatfish is just food for us.

But this is absolutely way up the food chain.

This is a predator on def urine and he's out of that.

Just look at the size of the mouth and the teeth that will just engulf.

Then it's large tail on powerful musculature.

Give it explosive acceleration.

It is undeniably a very odd looking beast.

A sight hunter with two eyes on one side of its face is something I've never encountered in fresh water.

Though this one seems to have calmed down after coming into the boat.

I don't want to push my luck.

Okay.

When I came to Alaska, I wanted to find out if there is anything under the water that could be responsible for some of these cases of unexplained human disappearances.

And the answer is an unequivocal yes, that is a very large and powerful fish living around the river miles and inlets of this remote coastline.

In a fight with one of these, it would be perfectly possible for an unlucky fishermen to be dragged down on lost in cold coastal waters.

At least one, a fisherman is known to have been killed by a huge halibut, and they have long been treated with respect by native Alaskans.

In these hostile waters, storms and boating accidents do take many lives.

But hooking one of these monsters could also be surprisingly deadly.

And in fact, having heard, Although I have about this fish, I should consider myself very lucky to have walked away from my encounter unscathed.