Sweden started building a final storage facility for spent nuclear fuel on Wednesday, only the second such site in the world, where highly radioactive waste will be stored for 100,000 years.
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I mean, really the only thing that’s gonna expose them is plate tectonics. Just to give a sense of scale, America and Europe are diverging by 4 cm/yr, so will be 500 metres farther from each other, horizontally, in about 10,000 years. Geologically stable regions (called cratons) would not experience such motion vertically for much, much, much longer.