They Couldn't Stop the Trains, So They Froze the Earth #megaprojects #tunneling

When constructing Boston's Ted Williams Tunnel beneath the active South Station railway, engineers faced an impossible challenge. The ground was made of soft, water-logged clay, and excavating it risked collapsing the active train tracks directly above. Instead of halting the city's transport, they decided to completely freeze the earth. By circulating sub-zero brine through a massive underground network, they turned the unstable mud into solid rock, allowing them to carefully jack massive pre-cast concrete tunnel boxes through the ice. Discover how this ingenious ground-freezing technique pushed the boundaries of modern infrastructure without stopping a single train.

#bigdig #boston #civilengineering #tunneling #groundfreezing #tedwilliamstunnel #megaproject #infrastructure #engineeringmarvel #tunnelconstruction