PATRICK LANDMANN / SCIENCE PHOTO LIBRARY PATRICK LANDMANN / SCIENCE PHOTO LIBRARY
Metro train tunnel construction. Workers building a sealed wall from plastic sheeting and wooden frames to prevent the spread of dust. The dust produced during excavations can lead to respiratory ailments. 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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