Karmøy Subsea Tunnel, The T-Connection, Haugesund, Norway. 2009 - 2011.

T-Forbindelsen - Karmøy tunnelen. 9 kilometer long Subsea tunnel.

The T-Connection and the Karmøy subsea tunnel connects the coastal communities Tysvær, Karmøy and Haugesund on the west coast of Norway.

Client: Statens Vegvesen (Norwegian Road Authorities).

Contractor: AF-Group as.

Constructed between 2009 and 2012, the 9 km long Karmøy subsea tunnel is the longest subsea tunnel in Norway before the realization of the Ryfast project (14 km subsea tunnel). The project passes 2 fjords; Karmsundet and Førresfjord with challenging geology and high focus on grouting and waterleak control.  

Figure: The roundabout in the middle of the subsea tunnel under the Fosen peninsula.

A video presentation of the project can be seen here:



Geological profile of the Karmøy tunnel. The methamorphic greenstones and shists to the west before the massive border faultzone (yellow) in the Karmsund fjord overlaying the phyllites (green) and the granittic bedrock (gray) in the east.