Old tech version of "Store data in perpetuity"

So it began in his shop six years ago, in 2012, this time capsule of his, what he calls the Memory of Mankind project (or MOM), with Martin making his first ceramic tablet, etching a greeting to future finders. The first tablet addresses creatures a million years from now—whoever they may be—explaining that here lies “a preservation project” meant to protect knowledge about “our present civilization from oblivion and collective amnesia.”

and the website… https://www.memory-of-mankind.com/