Five years after the attacks on the World Trade Center, we were asked to undertake the physically and emotionally monumental task of restoring full transportation services underneath the 16-acre World Trade Center site. This included incorporating full pedestrian access from the site to the city's subway system.

The project required executing a large-scale and complex engineering project without creating service interruptions for the temporary subway and train station in place since November 2003. It meant moving large, often complex equipment and materials into the heart of one of the world's busiest and densest population centers. It also required sensitive, meticulous coordination with city officials as well as other crews working on the 9/11 Memorial and new One World Trade Center building above ground.