Metro train tunnel construction. Workers in a newly blasted tunnel where a steel structure has been erected to secure the top and sides of the tunnel against collapse. Welding work is being done on a steel strut in the background. This construction work took place between 2000 and 2005, on the Paris Metro, the underground train system in Paris, France. The Paris Metro was founded in 1900, and by 2005 had over 200 kilometres of tunnels and over 300 stations.
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