SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Train tunnel construction. Construction workers inside a tunnel section for an underground railway. Rails have been used to bring construction materials to the building site. This tunnel section will be joined to the completed section of tunnel seen in the background. This work is being carried out on the Frunzenskaya metro line in St Petersburg, Russia. Photographed on 7 March 2006.
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