The Brenner Base Tunnel consists of two main tubes, an exploratory tunnel, four emergency stops, several by-passes, connecting tunnels and four lateral access tunnels. The access tunnels are located in Ampass, in Ahrental and in Wolf near Steinach am Brenner in Austria, and in Mules in Italy. They connect the tunnel tubes to the surface. During the construction phase, they are used for logistics. On the one hand, they are used to move the spoil via the access tunnels to the disposal sites. On the other hand, all material deliveries for the construction of the tunnel (concrete, iron and precast concrete elements) come in through the access tunnel. Two large tunnels and a smaller one Two single-track main tubes run between Innsbruck and Fortezza, set about 40 to 70 metres apart. This distance is necessary to keep the rock mass stable. Smaller tunnels connecting the two main tubes are located every 333 m. They are used for logistics but also for emergency rescue. A peculiar feature is the exploratory tunnel, which runs from one end to the other. This tunnel lies between the two main tunnels and about twelve metres below them. The exploratory tunnel is meant for geological prospection, as a service and logistics tunnel during the construction phase and as a maintenance and drainage tunnel during the operational phase. In total, the tunnel system for the Brenner Base Tunnel will include about 230 km of tunnels. bypass western tunnel tube Ø 8,1 m exploratory tunnel Ø 6 m eastern tunnel tube Ø 8,1 m 70m 333m 14 BRENNER BASE TUNNEL
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