Mayrit Tunnel Boring Machine Crosses Under Manzanares and M-30 2026

The Mayrit tunnel boring machine has successfully crossed under the Manzanares River and the M-30 tunnels, marking a major milestone in the extension of Madrid Metro Line 11. The breakthrough occurred on Tuesday at the future Madrid Río station site on Paseo de Yeserías, completing the first significant geological section of the project.

The event was attended by Jorge Rodrigo, the Madrid regional minister of Housing, Transport and Infrastructure, who welcomed the machine as it broke through. The tunnel boring machine, named Mayrit, arrived at the station box around 5:30 PM local time, executing what is technically known as a "cale" — the moment when two excavation fronts meet and align.

What Happened: The Cale at Madrid Río

The cale is a critical step in tunnel construction, where the machine's cutting head breaks through the station wall to connect two sections of tunnel. According to reports, the breakthrough was preceded by a low rumble from underground, followed by falling stones, and finally the impact of the cutterhead breaking the station's diaphragm wall.

Rodrigo celebrated the moment as "a moment of joy and pride," highlighting the precision and speed of the operation. The cale was completed eleven days ahead of schedule, a notable achievement in large-scale infrastructure projects.

Why It Matters: Progress on Line 11 Extension

The Mayrit tunnel boring machine began its journey on March 26 from the future Comillas station in Carabanchel. In just over two months, it has excavated 1,116 meters of tunnel, which represents 21% of the total planned for this branch. This pace suggests the project is moving efficiently, potentially reducing disruptions and costs.

The crossing under the Manzanares River and the M-30 ring road is particularly complex due to the geological and urban challenges. Successfully navigating this section without incident demonstrates the technical expertise involved and minimizes risks to existing infrastructure. The longer history behind the story is traced in Madrid Metro Line 11 Tunnel Boring Machine Advances Rapidly.

Key Takeaways from the Breakthrough

• The Mayrit tunnel boring machine completed its first major geological section under the Manzanares and M-30.
• The breakthrough occurred eleven days ahead of the planned schedule.
• The machine has excavated 1,116 meters, or 21% of the total tunnel for this branch.
• The event was attended by regional minister Jorge Rodrigo, underscoring the project's importance.
• The cale marks the alignment of two excavation fronts, a critical step in tunnel construction.

Technical Details of the Mayrit Tunnel Boring Machine

The Mayrit machine is a state-of-the-art tunnel boring machine (TBM) designed for urban environments. It operates by excavating soil and installing precast concrete segments to form the tunnel lining simultaneously. This method minimizes surface disruption and ensures structural integrity. Context on how this played out before sits in China's Jiaoping No.1: The World's Largest Tunnel Boring Machine. A companion piece, Australia's 137-Ton Tunnel Boring Machine Needs 152-Wheel Truck, approaches the same subject from another angle.

For the Line 11 extension, the machine must navigate under densely populated areas and critical infrastructure. The successful crossing under the M-30, one of Madrid's busiest ring roads, without causing significant surface impact, is a testament to modern tunneling techniques. The background to this story is set out in Madrid Metro TBM Mayrit Hits Palos de la Frontera Early. A related thread runs through Madrid Metro Line 11 Tunneling: Mayrit Nears Atocha After 3 km.

What to Watch Next

With the first major section complete, the Mayrit machine will continue its journey toward the next station. The project team will now focus on reinforcing the tunnel and preparing for the next phase of excavation. The early completion of this milestone may set a positive tone for the remainder of the project. Earlier coverage in Madrid Metro Line 11 Grand Diagonal: €1.1B Expansion Revealed shows how the argument developed. A closer look at the same subject appears in Car: latest articles.

Stakeholders and residents should watch for further updates on the Line 11 extension, as it aims to improve connectivity in southern Madrid. The successful crossing under the Manzanares and M-30 is a promising sign that the project is on track to meet its broader deadlines. Anyone following the wider picture can start with Madrid Metro Line 10: 25 Years Since the M-40 Tunnel Challenge. The same theme surfaces in Madrid A-5 Tunnel Opening Set for December 23, 2025, which takes a different angle.