20.11.2014, Bottrop, North Rhine-Westphalia, Germany - Emscher conversion, new construction of the Emscher sewer AKE, tuebbing tunneling, double pipe system, DN 2600, tunnel boring machine in the north tunnel, ring construction with 6 tuebbing elements each, view against the direction of tunneling, the ecological conversion of the Emscher system consists of the construction of a central sewage treatment system in the Ruhr area, the construction of sewers and the renaturation of the Emscher and its tributaries. 00X141120D555CAROEX.JPG [MODEL RELEASE: NO, PROPERTY RELEASE: NO (c) caro images / Oberhaeuser, http://www.caro-images.com, [email protected] - In case of using the picture for any purpose, please contact the agency - the picture is subject to royalty!]