[aninhumer]

I've never really been convinced by these kind of grandiose abstract messages.

I think our best bet to actually convince a hypothetical future civilisation not to dig it up is an understated "FYI: This is radioactive waste. It's a pile of worthless stuff that will make you sick." in a few major languages. If we add more ceremony to the message, they may more likely to understand it, but I think they'll be less inclined to believe it. Why would we spend so much effort to protect something worthless?

And ultimately, how much is it worth to prevent a few excavators in the far future getting radiation poisoning? And for that matter how likely is the hypothetical series of events needed for this to happen? I think like many things to do with radiation, we're vastly overweighting the risks involved.

[theoh]

The "worthless" thing that's being protected is human life.

The idea of sending exotic signals with dramatic structures was just a brainstorming exercise that gets a lot of publicity because it seems exciting. But there's a definite risk that the waste would attract rather than repel innocent discoverers:

See https://en.wikipedia.org/wiki/Goiânia_accident