 After the First World War and the subsequent economic crisis, "AEG-Schnellbahn-AG", a subsidiary of AEG, had to file for insolvency and was liquidated.The city of Berlin took over the underground works that had previously been built; this included, among other things, the tunnel under the Spree near Jannowitzbrücke.This was not under Jannowitz Bridge, but under the nearby Waisen Bridge, which was destroyed in the Second World War and not rebuilt.