The tunnel boring machine is around 120 metres long, seven metres high and is also affectionately known as the ‘mole’, it bores slowly through the soil, carrying all the necessary equipment along with it.
The most important section is the drill head.
It consists of drill heads that cut through soil and stone. Behind this, auxiliary equipment can be found for removing the excavated material, as well as for securing and enlarging the tunnel.
The two tunnels for the U2 lines between the Matzleinsdorfer Platz and Lerchefelder Straße are being built using this method.