DAVID HAY JONES / SCIENCE PHOTO LIBRARY DAVID HAY JONES / SCIENCE PHOTO LIBRARY
Replacing water mains. Workers replacing Victorian water pipes (black) with modern ones (blue). The age of the pipes, dating back to the 1860s, does not affect the water quality, but they do leak and therefore need replacing to prevent water wastage and flooding. Photographed at King's Cross Station in London, UK.
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