I mean you say that as if just burying it isn't actually the proven safest option.

Startups are already beginning to explore using old oil drilling equipment to sink nuclear waste below where it'll pose a threat, after it's been suffused into a shitton of concrete of course.

Very rarely is nuclear waste of the corium toothpaste variety, more often it's the old hazmat suits that are getting replaced and need to be disposed of with special care, or expired rods you can still have limited contact with without many issues.