ray cat song been looping in my head all day... aka the “10,000-Year Earworm to Discourage Settlement Near Nuclear Waste Repositories”
essentially, back in the 70s some people started to realize that we would be dealing with a nuclear hangover for the next hundreds of thousands of years. and so they began to ask, "how will we discourage people from digging up the waste, say 10k years from now?"
over the past 50 years, lots of potential solutions or warning markers have been floated. in the 90s carl sagan suggested a skull & crossbones, and a landscape architect proposed a landscape of massive granite thorns to cover the WIPP site outside of Carlsbad.
languages have half-lives, too, so it would be futile to write out a sign. storyboard style warning narratives are also difficult because meaning is inverted depending on language or conditioning to read left to right or right to left.
so, back in the 80's when Yucca Mountain was proposed as a nuclear & radioactive waste isolation site (coming before WIPP), two philosophers (Françoise Bastide and Paolo Fabbri) came up with what would be the "Ray Cat Solution"
it proposes that we would engineer cats that change color in response to radiation, and that we would create a culture where if your cat changes color, you should move some place else and never return to where the cat changed color.
lyrics from “10,000-Year Earworm to Discourage Settlement Near Nuclear Waste Repositories”:

"Don’t change color, kitty.
Keep your color, kitty.
Stay that midnight black.
The radiation that the change implies
can kill, and that’s a fact."
the point is not that the song would exist for 10k years, or that the language would be audibly legible for even half that amount of time. the point is that the cats and the danger their color change implies would outlast the song, becoming legend and lesson.
ray cat is my favorite proposal to prevent human intrusion into nuclear waste repositories, but there is a lot more weird information here: https://www.nrc.gov/docs/ML0400/ML040080812.pdf
this one is also super cool: https://wipp.energy.gov/library/cca/CCA_1996_References/Chapter%207/CREL3328.PDF
I recommend appendixes F & G for deterrent marker and sign proposals.
my understanding is that as of now, though WIPP is not really the solution for "long-term storage" of nuclear waste that it was billed to be, the waste in there now will be marked by a large berm, granite monuments, & buried libraries (in the 6 UN languages, plus Navajo)
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