The Brenner Base Tunnel (BBT) connects Austria with Italy. With a total length of 64 km, it will be the longest railway tunnel in the world after its completion.

The tunnel begins with a bypass of Innsbruck and leads to Fortezza in Italy. The challenging geology, high overburden and rock formations of varying strength pose a major challenge for this project. Furthermore, the many construction lots with their complex logistics require careful planning. In Austria, Amberg is involved in the project with the design of the tender and execution as well as the geotechnical site management. The overall management of the engineering joint venture is also the responsibility of Amberg. The two parallel railway tunnels are constructed in TBM tunnelling with several intermediate access points. An exploration tunnel over the entire length provides information about the geology and can later be used as access for maintenance work

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