First and second phase tunnels linked – breakthrough between Matinkylä and Finnoo

The first and second phase tunnels of the West Metro were linked for the first time on Wednesday, 29 November, as a breakthrough was made in the southern rail tunnel, between the completed Matinkylä rail tunnel and the Finnoo tunnel under excavation. The northern rail tunnel will be connected during week 49.

In each West Metro contract, the worksites excavate simultaneous tunnels which are then connected at the boundary between contract areas. At the Matinkylä–Finnoo section, the tunnels were separated by on average a three-metre layer of rock that was removed for the breakthrough.

The breakthrough was carried out so as to not cause disturbance to the operational metro traffic. The breakthrough between the tunnels took place at a distance of some 500 meters from the station. The explosion force was also suppressed by a pressure wall and excavation bank.

After the Matinkylä–Finnoo section, only the Espoonlahti–Kivenlahti section remains unconnected, with the breakthrough between them planned to be carried out in mid-December.

A total of 93.4% of the excavations for the West Metro’s Matinkylä–Kivenlahti section are now completed. Five new metro stations are constructed for the second phase west of Matinkylä: Finnoo, Kaitaa, Soukka, Espoonlahti and Kivenlahti. In addition, an underground metro depot will be constructed in Sammalvuori.

Further information: Länsimetro feedback phone number (Mon–Fri 9:00–15:00): +358 50 377 3700