The 5,875-metre-long (19,275 ft) tunnel runs between the village of Grødem on the mainland in Randaberg municipality and the island of Sokn in Stavanger municipality, running underneath the Byfjorden.

The tunnel was built as part of the Rennesøy Fixed Link project which opened in 1992 with the goal of connecting all the islands of Rennesøy to the mainland.

The tunnel is part of European route E39 highway.

With a maximum 8% grade, the tunnel reaches a depth of 223 metres (732 ft) below sea level at its lowest point.

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