To extend Manhattan's No. 7 subway line westward, a massive $1.1-billion construction effort was undertaken to dig new tunnels. After four years, the project has produced an L-shaped excavation stretching from Times Square, the No. 7 subway line's current terminus, to West 25th Street, and it includes a soaring new subway station at West 34th Street and 11th Avenue to serve the emerging Hudson Yards neighborhood.