Going underground: waterproofing on Boston's CA/T project

With almost half of the massive Central Artery Tunnel Project being constructed in tunnels, engineers rely on innovative waterproofing solutions to ensure that Boston traffic is kept safe and dry.
Downton Boston's archotecture features a unique mix of colonial era structures and modern office buildings. But these days, cranes -about 150 of them in all-dominate the skyline. The equipment is an inescapable sign of the city's massive road construction, known as the Central Artery/Tunnel Project (CA/T).