As reactors and waste grow, Finland’s fix is a lone example. Sixty nuclear power plants are under construction worldwide, and a further 110 are planned. Yet no one really knows what to do with the lethal waste. It’s been piling up for decades. Now, in a giant network of tunnels 450m underground, the Finns say they have the world’s first permanent solution.

Lucy Hockings talks to the BBC’s Adrienne Murray, who has toured the tunnels, and Graihagh Jackson, from The Climate Question podcast.

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This episode was presented by Lucy Hockings. It was made by Pete Ross and Neal Razzell. The technical producer was Mike Regaard. The assistant editor is Sergi Forcada Freixas, and the senior news editor is Sam Bonham.