On March 3, 2009 the building of the City's archive collapsed into a Stadtbahn's tunnel under construction on the Severinstraße, killing two people [REF].
In order to make use of the already completed tunnels and stations, a shorter service running from Dom/Central Station to Rathaus (city hall) started operation in December 2012,[REF] re-routing line 5 from its previous terminus at Reichenspergerplatz to serve the new NSS.