I have added the underground pedestrian connections below the intersection, mostly from memory after visiting the place once (by bike, so I didn't use the stairs, but only the ramps and the elevator). Should be ok topologically, but please add more details and refine the geometry. Is there an additional tunnel directly into the station?

Hier ist offenbar ein Industriegebiet "Grünewald" im Entstehen, das auf der Karte (und auf den letzten Satellitenbildern) noch fehlt.