On the eleventh of January 2013, after 135 days of drilling, Adval JSC broke through the Kolsila Road Tunnel in Hamina, Finland. The project consists of two tunnel pipes, each 150 meters long and a cross section of 122.5 m2.
The scope of works which Adval JSC must perform in the project include the complete drilling, first and secondary lining, which demands the presence of all the necessary machines, with the service base for their maintenance, licensed personnel for the blasting works, management staff, workers, etc.

The challenge during the drilling works was the compliance with all the limitations and requirements regarding the noise, vibrations and working schedule since the construction site is situated in an urban area, as well as the harsh northern European climate of Finland, reaching outside temperatures of -20oC.