Pete Ross

It's going to take some time, of course, for this to all happen.

But I think those who had those concerns are going to say, well, actually, we haven't really seen any evidence that anything's changed as of yet.

And TikTok, of course, would say that it had already been fragmenting US user data and keeping it separate precisely to try to allay these fears.

So,

I think in terms of is it the silver bullet?

Is TikTok suddenly forgiven?

We'll have to wait and see.

Zoe Clyman talking to Alex Ritson.

How do you safely dispose of radioactive nuclear waste?

That's the tough environmental problem facing many countries looking to scale up nuclear power operations.

Finland is already further ahead than most.

Last year it became the first country in the world to finish a deep underground facility, where spent nuclear fuel will be locked away for thousands of years.

Our science correspondent Victoria Gill has been to the site to discover how the process works.

As we drive northwest from Helsinki, what strikes me about the scenery, apart from lots of trees, is dense grey rock.

Some of the main road is cut through the granite.

It's beneath that dense bedrock that some of the most hazardous material produced by humanity, highly radioactive spent nuclear fuel, will be buried in a place called Onkolo, which is where we're headed.

Disposal holes are drilled in the tunnels using a purpose-built boring machine.

At ground level, above the tunnels, is a visitor's centre with an exhibition explaining the whole containment and permanent disposal process.

In that time when we started, we were not the first in the world.

Sana Mostanen is a geologist and project manager for POSIVA, the company that operates Onkolo.