How is the tunnel being built?
The tunnel will be built using a combination of cut and cover (about 75 percent of the underground section) and bored tunneling techniques. The cut and cover approach is similar to the technique used to install sewer and water mains across the region. A trench is dug to an appropriate depth, tunnel segments are placed into the trench and, once the tunnel is assembled, the trench is backfilled. The roadway or ground above the construction is then returned to a pre-construction condition.
