On 04.06.2014 the Swedish road and railway authority Trafikverket signed with the JV Zueblin/Boskalis the design and build contract for the Marieholm tunnel project. The tunnel, 30 m-wide and 10 m-high, will be located 600 m north of the existing Tingstadstunnel in Gothenburg, and will connect the urban districts of Marieholm and Tingstad. The tunnel will be constructed partly as cut and cover and partly as immersed tube. The cut and cover and the ramps will be constructed in-situ in dry construction pits. The tunnel will have three lanes in each direction and has been dimensioned for speeds of 50–70 km/h.

Zueblin will construct three tunnel elements of 100 m in length each onsite in a drydock and immerse them at their final location in a trench dredged into the river bed. On either side of the immersed tunnel section, cut and cover tunnels will be built in deep excavation pits continuing in ramp and trough sections. Special consideration will be given to the environment during all phases of construction. The installation of all mechanical and electrical systems also forms part of the contract, which includes an option to operate and maintain the tunnel for five years after completion. For the realization of this project Boskalis will dredge a trench with a depth of around 20 m into which the tunnel will be submerged, install the sand beneath and alongside the submerged tunnel, and install a layer of rubble to protect the tunnel roof. For further information click se/44 and visit http://www.trafikverket.se/Privat/Projekt/Vastra-Gotaland/Marieholmsforbindelsen/The-Marieholm-Project-in-English/. 24/14.