Yes, the picture's coming through, okay, but the water visibility is poor.

It's hard to tell what is down there.

I was going along.

What's going a long way in the long way?

Long way.

That's something that looks a bit like a claw, but it's it's It's just a branch coming out of the I'm sort of expecting at any moment just to see.

And this is what you do.

You spot was, Yeah, so that's that's That's what the first thing about just saying yes, exactly.

And you see, I missed a couple shape of the floor when threatened crayfish back up and face the danger head on.

With Klaus raised ready to attack, I want to say under there is that you got a counter current and all the debris is moving sort of 80 or upstream.

Counter current is stirring up the water, reducing visibility something I need if I'm to stand any chance of catching a giant crayfish.

Problem is, there's all sorts of settlement on the branches, and this thing just knocks.

It'll often clouds at heart.

Although the camera does provide us with a unique view, it's slow going in the murky water.

So we decided to pack away the kit and try a different area.

Volcanic soil turns the water on eerie red.

This low visibility and the sun's glare make it even more difficult to spot anything lurking beneath the surface.

Actually, Jamie, you fool heads this way back with.

Finally, after days of searching, I get my first glimpse of the largest and most powerful freshwater invertebrate on the planet.

All I have to do is grab it, get your hand behind the tile and slide up towards the head.

Then I can't get their calls back and grab hard.

You fighting towards that bank?

Can you say OK, you know very well God, I don't wanna grab it in the wrong place.

If I get this wrong, my hand could be crushed.

You see?

Fighting down string downstream way.

Yep.

Yeah.

You sure got a slide along a tile?

Yes, of course.

Crayfish before, but nothing like this.

This is a couple pounds.

Yeah, it's a to Pam.

The biggest one.

You've seen, uh, 10 £11.

She's about 1 50 Is this one of the hurt?

If I did, I probably take your finger off seriously on this size.

If this could remove a finger, I shudder to think what an even bigger one could do.

I'd say she's a female, says she's got a crop of eggs under the tile and you can say they are.

So she probably have 500 to 1000 men toward checks to see if she's been caught on tank before, Right?

Let's take it to the bank in the process.

I can't put it back in the water.

Good stock.

Amazing start.

Really good.

So she's a new one.

And how old would she be?

Measure her and she is six and 1/2 inches.

So she'd be a bit 2122 years on dhe until today.

Evaded Capture Boy.

So that's that's encouraging.

So is the next thing.

You're gonna take this one, you keep in there and put it back.

Each microchip tag contains a unique I D, which enables.

Told to estimate crayfish numbers and growth rates, you are free to go.

I've seen my first joint crayfish on DDE that is still sinking in, and the incredible thing is more incredible fingers that wasn't even a big one that was a medium sized one.

Uh, which millions?

I get even bigger, and I can't resist the opportunity to get my hands on a full sized adult, Todd says.

If we follow the main river, I might get my chance.

Is that one that it doesn't?

It doesn't look like wood.

Yeah, unbelievable.

That's actually nice one.

That's a good size.

Getting out might be so easy, he says.

Going back that whole I log, most of it is hidden.

But I can already see it's big.

Do you think Go on underneath that.

This branch here or go.

We go with the guys at the top of the time, straight onto the top, kid.

Okay, He's just going by going back in time.

I can Don't grab it in the wrong place.

I got it.

I'm gonna get it out now.

Although there we go.

Yes.

Who would have thought you'd need two hands to hold a crayfish?

This one is enormous, and there's no way I'd want to tangle with these claws.

It's one of the largest Todd has ever seen.

He estimates it must be nearly 50 years old.

This one is a male to big difference.

is the lack of eggs under the abdomen, but also the size of those claws.

Those pincers, uh, absolutely formidable on this.

It's one of the most incredible creatures I have ever held Alien like.

And I can hear its mouth parts moving.

Never seen anything like it in fresh water.

What a spectacular find.

I feel enormously privileged to be holding one of Tasmania's last freshwater giants.

That's it was definitely worth coming halfway around the world to see.

My hope is that this incredible beast can live on and remain hidden deep in this lost world.