Stock Photo - 28 May 2020, Bavaria, Munich: Professional diver Marco Weisser is standing after his dive in diving equipment at a shaft on a Munich street crossing. Weisser inspects culvert installations on behalf of Stadtwerke München, which protect the underground tunnels and stations of the underground railway against groundwater. 400 siphon shafts are maintained by Stadtwerke München to protect the Munich underground railway network. Photo: Matthias Balk/dpa. - Munich/Bavaria/Germany

Stock Photo: 28 May 2020, Bavaria, Munich: Professional diver Marco Weisser is standing after his dive in diving equipment at a shaft on a Munich street crossing.

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