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[ New Search ] Bolting Sections into Place in the Tunnel Location : Chicago, IL Agency : PWA Owner : NARA (SPB) Medium : B&W Photo Control Number : N/A Enlarged Image Description : New sections are bolted into place after the tunnel has been driven forward during the construction of Chicago's new sewer system. PWA financed this project. Listed Under: [Utilities][Sewage Systems][Chicago Sewer System]