Second tube Gotthard Tunnel: first tunnel boring machine "Carla" at target

Important milestone in the construction of the second Gotthard tube: With its cutting wheel with a diameter of more than seven meters, tunnel boring machine "Carla" has been driving the access tunnel to the north fault zone into the Gotthard massif since August 2022. 3,950 m deep in the mountain, Carla arrived at its destination on April 23, 2023.

Tunnel construction @ Implenia

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