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There is an ongoing project to carve knowledge on clay tablets and seal it in a salt mine in Austria. Sounds like it checks some of your boxes. https://www.the

• carapace 7y ago
  Wow! https://www.memory-of-mankind.com/how-is-information-kept-legible-for-1-million-years/ https://www.memory-of-mankind.com/how-is-information-kept-le... > The geology of the mountain will allow the MOM archive to fully close itself by a natural phenomenon: the salt “flows” with a speed of 2 cm/year into any void. This will protect the archive from the greatest threat; man himself. > The pressure which results from the weight of the mountain and a hypothetical ice shield of 5 km thickness is approximately a fifth of the burst pressure of the used materials.