Portuguese 
It took 706 days of continuous excavation for the Wilma tunnel boring machine to drill through 7.5 kilometers of alpine rock and find, in the dark and over a thousand meters deep, the gallery that a team on the other side of the border had been excavating directly toward it.
The final breakthrough occurred on August 25, 2026 and completed the west tube of the Brenner Base Tunnel between Austria and Italy. According to BBT SE, the company responsible for the project, the machine began its advance on September 18, 2024, in construction lot H53, between Pfons and Brenner.
The meeting of the two fronts occurred 1,408 meters below Geigenspitze. With this connection, a continuous tube is formed that runs from the Sill gorge near Innsbruck to Fortezza in South Tyrol, adding up to 55 kilometers of main gallery.
The Alpine Bottleneck is Older than the Automobile
To understand why someone invests decades in this, you need to look at the map. The Brenner Pass is the lowest crossing of the central Alps, and because of this, it has always concentrated the traffic that crosses Europe north-south. What was once a trade route became a truck corridor in the 20th century.
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As a result, those living in the Austrian and Italian valleys of the region are familiar with long truck lines, constant noise, concentrated pollution within a narrow corridor between mountains, and a highway that climbs and descends at great cost in fuel and maintenance. According to the project, the tunnel’s purpose is precisely to remove this load from the road and place it on the railroad, beneath the mountain, on a nearly flat trajectory.
In other words, the difference between climbing the mountain and crossing through it is not aesthetic. A train on a steep incline requires more locomotion, carries less freight per run, and consumes much more energy. A flat path beneath the mountain, on the other hand, allows for longer and heavier trains with less traction. This is where the math works out.
Two Teams Digging toward Each Other
What impresses me most about this story is the precision required. Two fronts start from different countries, advancing through rock that no one sees, each with its own team, its equipment, and its schedule, and they need to meet. It’s not enough to come close: the alignment must be perfect for the resulting tube to be usable by high-speed trains.
According to tunnel engineering practice, this is done with extremely high-precision surveying, continuously corrected throughout the years of advancement. In addition, alpine rock is not homogeneous. The machine passes through hard sections, fractured areas, zones with pressurized water, and each of these conditions requires adjustments in speed, support, and sometimes even method. Maintaining the course for 706 days in this environment is true technical work.
It’s worth noting that Wilma did not work alone. Another tunnel boring machine, named Olga, is advancing in parallel through the main tubes toward Innsbruck. Projects of this scale are executed by multiple machines simultaneously in separate batches, and the final timeline depends on all of them.
A Project That Spans Generations of Engineers
Thus, large-scale projects have a characteristic we rarely discuss: they last longer than the careers of those who start them. From study, licensing, excavation, installation of the track, signaling, and testing, decades can pass. The engineer who signs off on the initial plan is seldom the same person who sees the first train pass through.
Meanwhile, the country must sustain financing through changes in government, economic crises, and shifts in political priorities. This is why projects of this magnitude often rely on agreements between states and supranational funding, rather than just an annual budget. Without such institutional protection, they simply stop mid-way.
The boring of the tube, moreover, does not mean the tunnel is ready. After the breakthrough comes final lining, drainage, permanent track, power, ventilation, signaling, and a long testing phase before any commercial train can operate. The moment of celebration is symbolic, not operational.
There’s also an environmental calculation behind the European decision. Transporting freight by rail consumes a fraction of the energy per ton compared to trucks, concentrating emissions at one point in the electrical system instead of dispersing them across thousands of exhausts on a mountain highway. In the Alpine valleys, where air is trapped between slopes, this difference is felt directly by the residents. It’s no surprise that Austria has been imposing restrictions on heavy traffic in the corridor for years.
Even so, it’s easy to understand why photos of workers embracing in front of a freshly blasted wall circulate so widely. It’s one of those rare moments when an abstract effort, involving spreadsheets and schedules, turns into a tangible hole that connects two countries.
Is it worth starting a project that will only truly serve the next generation?
