This is probably the best idea for Berlin that I have heard since moving here about five years ago.
A bike lane under the U-Bahn stretch.
Make this happen now, German people.
Do it now!
A curious thing about this project is that it connects me directly with my old friend from Copenhagen by linking Charlottenburg with Friedrichshain, where we live respecitively!
Read more about the project here.
Here is the planned route: