The existing 7,670-meter (25,160 ft) long tunnel runs under the northern part of the mountain Ulriken in Bergen.

Before the tunnel was opened in 1964, the Bergen Line ran via Nesttun.

The Norwegian National Rail Administration has plans for building a second tunnel through the mountain.

On August 29, 2017 infrastructure manager Bane Nor and contractors Strabag and Skanska successfully completed the boring of the new tunnel.

Completion of the new double-track tunnel was expected in 2020,[2] and it opened in December of that year.