What is a tunnel digger called？A tunnel digger, in the context of construction and engineering, is often referred to as a "tunnel boring machine" (TBM). This massive piece of equipment is specifically designed to excavate tunnels with minimal disturbance to the surrounding ground structure. TBMs come in various designs depending on the type of material they need to cut through, ranging from soft soils to hard rock.

　　In other contexts, particularly in mining or when referring to smaller scale operations, individuals who specialize in digging tunnels might be known as miners, tunnel workers, or tunnellers. These terms typically refer to people who use both manual tools and machinery to create underground passages for various purposes such as transportation, utility lines, exploration, or extraction of resources.

　　The term can also have specific historical connotations, especially during wartime, where soldiers would dig trenches and tunnels for strategic military advantages. In this case, they would be referred to as sappers or tunnel troops.

　　A person who digs tunnels is often called a tunnel worker or tunnel miner. In specific contexts, especially in engineering or construction, they may be referred to as a tunneler or tunnel boring machine (TBM) operator if they work with large mechanical digging machines. Skilled tunnel diggers who work with explosives or other specialized equipment may also be called blasters or drillers.