I'm standing 90 miles north of the Arctic Circle in front of an amazing Vista.

There's something of a Grand Canyon type chasm in front of us.

Above it sits a small city. We can see the colors of all the different

wooden houses in front of us, the reds, greens and yellows. We can see some high-rise blocks. We can

see offices and we can hear some mine workings in the background and the extraordinary

thing the quite amazing thing is that this city is going to have to move because it's about

to fall into the chasm and the mind workings. I'm Leslie Riddick. I'm Leslie Riddick. I'm an author and journalist with a passion for the way they do things in Scandinavia.

I want to take the best ideas from the Nordic countries and share them with the world.

For Discovery on the BBC World Service, I'm in Arctic Sweden to find out how to move a city.

We are inside Kirnadora, the mountain here,

and we are on level 540 meters.

We have 400 kilometers on maintain road within the mine. So it's the biggest underground

mine for iron ore in the world. The mine here at Kiruna in the far north of Sweden has been worked for more than a

hundred years. One and a half billion tons of iron ore has been extracted since

1900. Producing 90% of Europe's ore, it's already so big that you have to take a bus to

travel through it. But our hunger for this exceptionally pure iron ore used in steel production means that it needs to get bigger

still and that's why the city of Kirona is going to have to move.

Behind us we have all our operations here in Kirona, the mountain Kiranavara, where the mining started at the top.

And beneath it, we have all the infrastructure of the mine, going all the way down to 1,365 meters below the old top of the mountain.

And as Lindber is from the state-owned mining company LKAB, whose sleighkeepeps and processing plants dominate this landscape.

And the ore body is 4 kilometers long, stretching from the south towards north, towards the city

center. And our mine reaches all the way down one and a half

...