The tunneling segment is growing rapidly worldwide and demands very special expertise. HOCHTIEF is always proud to demonstrate this expertise with custom-engineered, literally groundbreaking solutions. We have a long tradition of showing the way as international technology leaders in tunneling, with an impressive reference list of projects all around the world. The 3 kilometer Lainz rail tunnel in Vienna (see photo) currently under construction by HOCHTIEF is further testimony to the Group's tunneling prowess.