Foto de stock - The sewage worker Kai Zinser stands in front of the entrance to a unit of 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: The sewage worker Kai Zinser stands in front of the entrance to a unit of the underground rain overflow basin in the city centre of Schweinfurt, Germany.

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