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Lead, mercury, arsenic... Some places will never be settled again.

https://en.wikipedia.org/wiki/Zone_rouge

(to top that some ammo dumps were simply dumped in holes in the ground at the end of the war and are slowly diffusing there toxic compounds via under ground rivers)

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How do we as a species communicate for the next ten thousand years, that these places are poisoned and dangerous? The answer- statues of Goatse..

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

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