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According to the Wikipedia article above:

>The Onkalo repository is expected to be large enough to accept canisters of spent fuel for around one hundred years, i.e. until around 2120.[10] At this point, the final encapsulation and burial will take place, and the access tunnel will be backfilled and sealed.

So they're already planning to fill the tunnels completely. Considering the depth of the main facility, I would think this will make it very difficult for a primitive civilization to reach the facility even if they found the former entrance and wanted to investigate.




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