A look under the city

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Tunnel between La Sallaz and Fourmi under the Route de Berne with "Jumbo" vault reinforcements (© Schobinger/MLO SA)

Tunnel between La Sallaz and Fourmi under the Route de Berne with "Jumbo" vault reinforcements. (© Schobinger/MLO SA)

The St Martin Bridge below the Béssières Bridge with scaffolding before pouring the concrete (© Schobinger/MLO SA)

Making sure the tunnels are where they need to be (© Schobinger/MLO SA)

The drilling begins at the Place de l'Ours (© Schobinger/MLO SA)

The early stages of digging toward the Place de l'Ours (© Schobinger/MLO SA)

The Fourmi Station evolves (© Schobinger/MLO SA)

Industrial cutter in action, the principal machine responsible for digging the tunnels (© Schobinger/MLO SA)

Welding the rails (© Schobinger/MLO SA)

The tunnel with ventilators, close to Flon. (© Schobinger/MLO SA)

St Martin Bridge with the cathedral in the background. (© Schobinger/MLO SA)

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A look inside the tunnels for Lausanne's new underground, the M2