German'y Gorleben and Asse burial sites failed spectacularly.

So Finland "improved" on that out-of-sight, out-of-mind burial solution - and took it to new depths, so-to-speak - far from any potentially whinging NIMBYs.


https://yle.fi/a/74-20013058

https://www.science.org/content/article/finland-built-tomb-store-nuclear-waste-can-it-survive-100000-years