Stuttgart, Germany. 08th Dec, 2016. Construction workers in a tunnel during a tour of the building site where a large railway construction project is currently underway in Stuttgart, Germany, 08 December 2016. An expert commissioned by German Railways has stated that there are no risks associated with the use of anhydrite in the construction of the railway tunnel. Photo: Lino Mirgeler/dpa/Alamy Live News

- Image ID: HC4C9X

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