Shafts

The metro tunnel shafts are located at intervals of approximately 600 metres and extend to ground level. They serve as an escape route, a smoke vent, a pressure equalisation system and a ventilation system. The shaft buildings serve as emergency exits. The middle of the shaft contains a fire-compartmented escape route staircase. Vertical shafts are located above ground, in public street and park areas. The shaft buildings are technical spaces that are the size of a small, detached house, with a full height of approximately 3 metres and a floor area of roughly 100 m².  The shafts are clad in steel mesh.