station (U3/U6) — Completed The increase in traffic and the new Allianz Arena also required a larger capacity for this already overcrowded pivotal transfer station. New pedestrian tunnels were built, which provide more room for passengers transferring from and to the S-Bahn. They lie parallel to the existing platforms and are connected to them by 11 portals. At the south end, they meet the transverse tunnel, where the escalators to the S-Bahn platforms are located. To prevent Munich's historic town hall, located above the station and in between its two tunnels, from sinking in during the construction works, the ground surrounding the construction site had to be frozen over. The construction was completed in time for 2006 World Cup. Karlsplatz (Stachus) (U4/U5) — Completed The two mezzanine levels and north entrance were renovated to include the enhanced fire protection and the updated interior. Due to the damage from humidity and water seepage, the structures of U4/U5 platforms were repaired and sealed up against further seepages. Münchner Freiheit (U3/U6) — Completed The interior has been updated with horizontally corrugated metal wall covering in fluorescent yellow. The square support columns are decked in deep blue tiles with blue lights casting down, giving them blue hue. The ceiling is covered with mirrors, giving the "infinite" height. The mezzanine level had been updated with new white floor. The aboveground tram and bus station received the new organic-shaped covering roof. An interesting fact: prior to renovation, the name was spelled with extra "e" in "Münchener". After the completion, the name is now "Münchner Freiheit" eliminating the extra "e", reflecting the current spelling trend, as well as a "return" towards more traditional Bavarian habits of spelling and pronunciation. Thus, it precisely mirrors the spelling on the street signs above. Plannings and in progress The original planners in the 1960s and 1970s did not envision the massive growth of passengers, increased number of subway lines, and continued extensions of current subway lines in the forthcoming years. Thus, they did not design the subway stations accordingly as to make them "future proof". The intersecting subway lines cause the overcrowding and frustrating movements between two station platforms, especially at Hauptbahnhof (U1/U2/U7/U8, U4/U5, and future U9 as well as S-Bahn), Sendlinger Tor (U1/U2/U7/U8 and U3/U6), and Odeonplatz (U3/U6 and U4/U5). The platform width and passage between stations and a fewer number of escalators were inadequate for larger number of people