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 civilisations 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. The Swiss photographer and artist Marcel Rickli reflects on these pressing concerns in the form of a visual research Project in the field of tension between documentary photography and art. His latest work, AEON, contrasts the symbolic nature of nuclear semiotics with the factuality of repositories as they are planned and built today. The project illustrates the difficulty of defining signs that not only have a physical existence over an immensely long period of time, but whose meaning is also universal. It poses questions about the future of mankind, unites approaches from physics, futurology, anthropology and sociology and culminates in the simple and at the same time existential philosophical question: What endures?