On the sixth of December 2012 after 170 days of drilling, Adval JSC commited the brakethrough of tunnel BÜHLTUNNEL (Siegen, Germany). The tunnel is 525 meters long (417 of which are executed at NATM) and has a cross section of 87 to 100 m2.
The greatest challenge during the drilling works of the tunnel was it's location, since it passes under a densely populated area of Siegen city. Congratulations to the miners and good luck in the upcoming initiatives.
