We forgot about the pyramides (4k years ago) and found some of them recently. There is research about how to warn future humans about the thread what turned out to be very difficult, because in 4k years, there have been multiple languages..
I would not call the status quo a permanent solution. Given the time it takes that stuff to not be dangerous anymore, we have got a temporary solution.
Also we didn’t forget about the pyramids. What does that even mean? People have lived right next to them since they were built.
There are more pyramids than just the 3 of Giza in Egypt... During the last 100 years, multiple pyramids (probably 100s) have been found that were forgotten by humanity. There are discoveries in China, Peru, Egypt, ...
The pyramids weren’t buried 1km under the surface
Somehow ironic. Yes, the Tomb of Tutankhamun was not buried 1km under the surface. But it was discovered 3.250 years after it was build in 1922.
Anyway... There is Egyptology, which has the goal to find out what they have done 1000s of years ago, because we did/do not know that. We don't know who some of the pharaohs are, some pharaohs that are mentioned haven't even been found. He can read some of the writings, we can't read all of them. Lots of knowledge was lost, and that's what you need to realized when you are planning to store stuff for 1000s of years.
Yes there are archaeological sites which have been forgotten and rediscovered.
Nothing you're saying is a strong argument about self sealing deep storage waste burial sites. I don't think you realize just how little waste nuclear reactors produce, they're not pyramids, they're a few barrels across years.
Germany alone expects it to be 10.500 tons until 2080. And that's only the "highly radioactive" part. That's more than a few barrels. And there are more countries on this planet than just the one I'm from...
Ah. Even so, that's less than the trash output of 1000 citizens. The quantity of waste is not very worrisome to me at all, especially considering all the other possible hazardous wastes from other industrial processes.