How can we protect future generations against highly radioactive waste, such as that produced in our nuclear power plants and in medicine, research and industry? They will pose a danger to life for hundreds of thousands of years to come. Beyond technical measures to ensure secure geological repositories, this also requires novel communicative solutions: future civilizations so distant that they are beyond our wildest imagination must be warned of the dangers posed by these sites. This raises fundamental questions of an anthropological nature about the role of language and culture in the transmission of information over extremely long periods of time, but also about the almost uncontrollable human risk factor. AEON, contrasts the symbolic nature of nuclear semiotics with the factuality of repositories as they are planned and built today.