Here, tunnel drilling machines work their way from several sides through the stone. There, they drill, blast, secure and clear the stone. Conveyor belts several kilometres long hum loudly. Tunnel construction is a highly precise clockwork mechanism in the mountain.

When tunnels are dug, routes are raised and stations and freight terminals are built, locals and neighbours want to be informed.

Ecologists and engineers have a lot to do to protect nature in the building phase and to develop new meadows, forests and creeks - with frog ponds and grey heron colonies, maple trees and trembling poplars.

Learn more about the Southern Line in on of the many Info Boxes, Info Glimpse and Bike Info Paths.