[ShockedUnicorn]

If it's anything like the Finnish facility there would be no digging, the facility has tunnels leading to the different storing locations. It will be continually used for centuries to place new spent fuel. They different rooms with spent fuel could easily be opened again.

[Maxion]

Planned lifespan of ONKALO is around a hundred years, not multiple centuries.

[theshrike79]

A hundred years should be enough time to make enough renewable energy to replace nuclear.

...or have Covid 2055 that wipes out 90% of the population.

[tephra]

The Finnish site is based on the Swedish method (KBS-3 if you want to read more) so not only is it anything like it, they are the same :)