A few weeks ago… or was it months… not sure, i noticed the strange pink water pipe flowing into the river. Every time i’d go by on the train i’d tell myself that i’d go back and investigate. The river froze and unfroze, the snow fell and melted… but i never got round to investigating the pipe.
In the last picture you can see the pipe in the middle of the shot, at the far end of the foundation pit. From there it runs several hundred meters to the river (the Alster, a tributary of the Elbe).
The mystery is solved!