Ken Whelan

of Greenland and Canada on the far side.

And they're trying to go through this gap between Greenland and Canada up through what they call the Northwest Passage, up by the edge of Alaska and out into the Pacific.

This was going to be really, really valuable from a commercial point of view.

So there was a lot of efforts made, but unfortunately it was very difficult because obviously at that stage it was frozen.

And increasingly over recent decades, indeed, we talked about it at one stage in one of the programmes some years ago, increasingly there's a lot of floating ice now.

So there's a lot of actually loose water, if you like, underneath that ice.

And we are seeing jellyfish and so on that are intrusions from the Pacific into the Atlantic.

And the whole focus was on this Northwest Passage, but equally on the far side of Greenland.

And Greenland is this enormous island, you know, the size of Europe, this massive great piece of ground.

And on the other side, then you have the Northeast Passage.

So the Northeast Passage potentially could be really important as well from a navigation point of view and also important as well from a defence point of view.

And that's why there's this incredible focus on Greenland.

But from an environmental point of view, things are happening so fast and so extensively in Greenland.

I think for creatures that are very long lived, they're going to need a very stable environment.

And certainly we're seeing evidence from the salmon point of view that that environment may not be as stable as we think it could be.

Whether it's a good thing or a bad thing, we don't know.

But what's it doing here?

Well, that's the point.

I mean, how did it get here?

What is it doing here?