This has to be snark - Waste is never safe to store - the containment has to prevent leeching - over a lifespan of thousand, or tens of thousands of years
And it only takes one earthquake, or animal digging to completely upend that strategy
An earthquake will not suddenly take the waste from hundreds of meters underground and throw it in the air. I mean, assuming you store it in a reasonable place.
Sure, you need the right place, but it's not like there's a shortage of space far away from everything.
And yet we had a natural nuclear reactor that's been self contained for 2 billion years: https://en.wikipedia.org/wiki/Natural_nuclear_fission_reacto...
What kind of animal is going to dig through concrete and steel and also be hundreds of meters underground in solid rock?