Underground property damage is used in insurance to refer to damage to wires, conduits, pipes, mains, sewers, tanks, tunnels, any similar property, and any apparatus in connection beneath the surface of the ground or water.
An underground property damage exclusion would remove coverage for this class of property caused by and occurring during the use of mechanical equipment during construction operations such as grading land, paving, excavating, drilling, burrowing, filling, backfilling, or pile driving.