You put the waste into containers and bury them deep into a geologically stable mine that you then seal shut. https://en.wikipedia.org/wiki/Onkalo_spent_nuclea

You put the waste into containers and bury them deep into a geologically stable mine that you then seal shut. https://en.wikipedia.org/wiki/Onkalo_spent_nuclear_fuel_repository https://en.wikipedia.org/wiki/Onkalo_spent_nuclear_fuel_repo...