Finland is set to pioneer permanent underground storage of spent nuclear fuel, with the Onkalo facility built 433 meters deep in stable bedrock for long-term safety.

The elevator display reads "433", the number of metres below ground. The doors slide open, revealing the entrance to what is expected to be the world's first permanent repository…

Finland is set to pioneer permanent underground storage of spent nuclear fuel, with the Onkalo facility built 433 meters deep in stable bedrock for long-term safety.

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The elevator display reads "433", the number of meters below ground.