The term 'underground network' refers to a system of interconnected tunnels, pipes, and other structures that are located beneath the surface of the ground. This network can include ROOTS, sewers, gas mains, and other underground infrastructure. ROOTS are the underground parts of plants, such as tree ROOTS, which can be found in soil and other substrates. Sewers are underground pipes that transport wastewater from homes and businesses to treatment facilities. Sewers can also refer to the system of pipes that make up the entire sewage system. Gas mains are large pipes that transport natural gas from one location to another. All of these components form an underground network that is essential for the functioning of many cities and towns.