A tunnel boring machine, also known as a "mole" or a "worm", is a machine used to excavate tunnels. Tunnels are excavated through hard rock, wet or dry soil, or sand, each of which requires specialized technology. From Wikipedia
TBM Disha completes 1.647 km tunnel between Andheri East and CSIA Terminal 2, marking a milestone for MMRDA's metro expansion.
