Starting in November 1972, the station Stadtmitte, 22.5 meters wide, with a platform 12.8 metres in length, was constructed under the Theodor-Heuss-Straße, which is near the Rotebühlplatz and is 45 metres wide. The platform area was also built to be able to serve as a civilian shelter with a capacity for 4,500 people, which would be usable in case of an emergency if the S-Bahn traffic was also stopped.
