A new 380-kV cable installation had to be been built between the Friedrichshain in the Berlin district of Prenzlauer Berg and the newly constructed transformer station Marzahn in the district of the same name. It is intended to close the final gap in the diagonal measuring a total of 38.3 kilometers through Berlin's load centers.
Starting from three shafts, three Mixshields were in use at the same time. The TBMs tunnelled through 5.4 kilometers of ground at a depth of up to 25 meters. The maximum tunnelling output was 185 meters a week. A number of houses, commuter, and local train lines along the route had to be crossed under. Bewag, the Berlin electricity supplier, put the cable installation into operation on November 6, 2000.