Stockholm’s Söderstrom Tunnel broken through

The Citybanan is a 6 km long, twin-track S-Bahn tunnel (over 500 trains/day) in the middle of Stockholm and provides the link between Tomteboda on the northern limits of the city with the suburb of Södermalm located in the south. This project was selected for the 2011 STUVA Prize on account of its innovative production method including the 3-part immersed tunnel between Södermalm and Riddarholmen devised as an underwater bridge. The underwater sections are founded on 4 pillars owing to the soft surface that forms the ocean bed. The immersed tunnel with 3 % incline beneath the Soderström, an...