“Onkalo,” which means cavity, or cavern, in Finnish, is an apt name for Finland’s repository for radioactive waste. Touted as a “100,000-year tomb,” the Onkalo facility on Olkiluoto—a small island in western Finland—is currently being built at a depth of 450 metres, inside bedrock. It will be the world’s first permanent disposal site for spent nuclear fuel.
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Asha Gopalkrishnan is a freelance journalist based in Helsinki, Finland.