The centrepiece of the 125 km long, double-track high-speed line between Graz and Klagenfurt is simultaneously the key project for the Baltic-Adriatic-Corridor. The Koralm Tunnel improves the traffic link between Graz and Klagenfurt.
During the construction of the Vienna underground line 2 extensive dewatering works with approx. 270 wells and approx. six million pumping hours were required. An electronic monitoring and control system made the measure safe.
The Roppen tunnel between Innsbruck and Landeck in Austria was made safer by the construction of the second tube. The 5,069 meter long tunnel was driven conventionally.