Унтер-ден-Линден
The link is in length, connecting the former U55 terminus at Brandenburger Tor with the rest of the U5 at Alexanderplatz. The link features three new U-Bahn stations at Rotes Rathaus, Museumsinsel and Unter den Linden, with Museuminsel to open later in 2021. Unter Den Linden provides an interchange with line U6, replacing the former U6 station at Französische Straße, located a little further to the south on Friedrichstraße, which closed on 3 December 2020.