Underground cable is placed into ducts which are being built below the ground surface. In urban areas where space for telecommunications cable is limited, it needs to be used more efficiently. In underground installation, the conduit provides protection from both physical and environmental abuse. The conduit protects cable from shifting rocks, aggressive rodents, and/ or damage from hand shovels. Underground cable that is in conduit is easy to replace or upgrade. The old cable can be pulled out of the conduit and the new pulled in without extensive and expensive digging.Underground cable and ducts are part of the underground conduit system. Telecommunication conduits are made from various materials and buried directly into the soil or encased in concrete. Fiber optic cables have provided a more optimal use of available underground conduit space because of its small cable diameter and the much higher communications traffic capacity of each cable.