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It seems to me that if you're going to bury nuclear waste then you just need to bury it deep enough. The idea is that any future humans even capable of digging the material up wouldn't need any signs to tell them the material was dangerous. Instead, they be sufficiently technologically advanced that they could figure this out for themselves.

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I think this is part of the best answer.

Find a place where there's nothing of value under the surface (that we can think of), bury it really friggin' deep, and then put the warnings in a layer of, I don't know, engraved gravel about 100M above it, just in case anyone ever does dig there. In case the warning might help.

And don't put anything on the surface that'll outlast the people who can understand what's down there.

All of these signs, finding clear ways to say "bad stuff below" -- they're only helpful if the future people are inclined to assume the immensely-powerful, immensely wealthy, long-dead writer is being honest. Why in the world would they assume that?

Just imagine future-Indiana-Jones finding those signs, left by a long-dead civilization, and deciphering them. Does he say "oh, wait -- this looks dangerous; never mind then"? Of course not; instead he rounds up a digging party of locals, dodging future-Nazis, and after a harrowing adventure the Ark of the Covenant is finally unearthed -- but when the future-Nazis open it up the cavern, nothing seems to happen (but they oddly feel a bit warm), and then lots & lots of people die slow deaths (including future-Indy, sorry) as they trundle out the valuable "junk of the ancients" to be sold and traded far & wide.

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