In Boston Harbor a barge maneuvers a huge floating section of a steel tunnel into place, then sets it gently onto the harbor floor. High above the Charles River workers place ten lanes of roadway on what will be the widest cable-stayed bridge in the world. Boston will never look the same. Since 1991 Boston has been the scene of the largest public construction project in American history. The Central Artery/Tunnel Project-the "Big Dig"-is the solution to problems that for decades have caused major headaches for people driving in and out of this major American city. Peter Vanderwarker takes us behind the scenes of this complex, awe-inspiring project. Informative text accompanied by remarkable photographs, illustrations, and maps explain these concepts and introduce us to some of the people who have worked on this project.