This project included twin running tunnels with five cross passages, a 34th Street station cavern, three shafts, and numerous ancillary structures.
The 7 Line Extension was built by a JV of Skanska/ Shea/Schiavone known as S3. Gall Zeidler was involved with construction management as well as assessing the impact of the underground structures. The project cost approximately USD 2bn.
