REMLINGEN, GERMANY - MARCH 04: A sign with the word ' radioactiv ' is pictured in a tunnel of the ' Asse ' mine on March 4, 2014 in Remlingen, Germany. A former salt mine in the region, the Asse pit, is used as a deep geological repository for radioactive waste. Environmentalists and residents plead for the closure of the facility because of the pit's instability and the danger of the hazardous materials stored there. (Photo by Thomas Trutschel/Photothek via Getty Images)
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Photothek Thomas Trutschel