The abandoned mine was bought by the German government in 1965, ostensibly to research the suitability of salt domes for disposing of radioactive waste. Yet after two years, without waiting for scientific reports, the authorities secretly turned it into a cheap and supposedly permanent nuclear dump.By then, 90 per cent of the mine’s 5 million cubic metres of salt had been excavated, and the mine was already buckling under the weight of the rocks above, says Ingo Bautz of the BfS, who oversees activities at the site.As the walls bent, cracks formed. And because the miners had dug to within 10 metres of the impervious rock, in 1988, underground water started to trickle in.The true state of affairs only became public knowledge in 2008. Despite hurried backfilling of much of the mine, the degradation continues. Brine seeps in at a rate of around 12,000 litres a day, threatening to flush radioactive material to the surface. “It is a disastrous situation,” says Jochen Flasbarth, state secretary at the Federal Ministry of the Environment.