Imagine needing to guide a metro train over a natural valley and across several bustling highways without stopping traffic for even a single day. This was our "impossible" mission for Metro Line 6. Instead of a conventional bridge, we built a "concrete dragon" designed to be born piece by piece on one side of the valley and slowly creep towards the other.

This method was akin to assembling a long bridge from behind and inching it forward while the city's traffic flowed obliviously beneath.

Our main goal

We weren't just building a crossing; we were building a guarantee of continuity. The goal was for thousands of daily commuters to glide over an engineering marvel without even noticing, their journey between two tunnels perfectly seamless. We wanted to prove that massive urban projects could be polite guests that don't shut down daily life.

Take a look to our challenges

The core challenge was controlling a growing giant. How do you inch a span of this magnitude forward, millimeter by millimeter, without it warping or cracking? The answer lay in obsessive real‑time monitoring. Sensors, acting as the dragon's nerves, reported every stress and shift. The other battle was the precision‑timing of nightly operations during the quietest hours, coordinating with multiple agencies to temporarily block just a few highway lanes for a handful of hours each night. Every night was a commando operation.