Stock Photo - Hydraulic engineer Martin Wilke of the branch office of the shipping office in Potsdam, inspects channel buoys prior to the beginning of the new season of the local waterways, in Potsdam, Germany, 16 March 2016. The employees of the office are responsible for the maintenance of some 300 channel buoys set up on inland waterways spanning more than 100 kilometres in length in Potsdam and its surrounding areas. Photo: RALF HIRSCHBERGER/dpa | usage worldwide. - Potsdam/Brandenburg/Germany

Stock Photo: Hydraulic engineer Martin Wilke of the branch office of the shipping office in Potsdam, inspects channel buoys prior to the beginning of the new season of the.

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