Foto de stock - 'Stadtentwässerung Schweinfurt' can be read on the entrance to the underground rain overflow basin in the city centre of Schweinfurt, Germany, 17 July 2017. Unnoticed by many people sewage workers take care that cities do not turn into stinking cesspools. A great amount of the daytime they, therefore, spend in the underground. Photo: Daniel Karmann/dpa. - Schweinfurt/Bavaria/Germany

Imagen: 'Stadtentwässerung Schweinfurt' can be read on the entrance to the underground rain overflow basin in the city centre of Schweinfurt, Germany, 17 July 2017.

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