Comment by pjc50
15 hours ago
You may be riffing on it already, but for those who aren't familiar: https://en.wikipedia.org/wiki/Long-term_nuclear_waste_warnin... ("this is not a place of honor" has already become a meme that has escaped containment)
That's an easier problem. The conclusion for the Onkalo nuclear fuel repository was, once it's filled and sealed, not to mark it at all. A marker would create attention, and any future society capable of mining deep enough to get in would probably know about radioactivity.
Here's the sign at the SL-1 site, which is not a deep burial.[2]
[1] https://en.wikipedia.org/wiki/Onkalo_spent_nuclear_fuel_repo...
[2] https://en.wikipedia.org/wiki/File:SL-1Burial.jpg