TBM Mom Chung launches, beginning tunnel construction beneath SF
This video shows some of the first ground spoils excavated after our first TBM, Mom Chung, launched this week. This week tunnel boring machine (TBM) Mom Chung started digging, kicking off construction of San Francisco’s first new subway tunnel in decades. Over the next 10 months, the 350-foot-long, 750-ton machine will excavate and construct the […]