This week, let's dive underground alongside Damien Buffet, Project Director at Equans Tunnels, an entity specializing in ventilation for underground spaces. With 15 years' experience and expertise forged on major construction sites such as the Grand Paris Express, he takes us behind the scenes of a little-known but essential profession.

Have you ever thought about the importance of ventilation when you go through a tunnel? This simple gesture hides complex engineering, essential to your comfort... but above all to your safety. Air quality, smoke evacuation in the event of fire, energy efficiency: ventilation plays a vital role in these underground infrastructures.