Fiber optic cables are typically buried between 12 and 36 inches (30–90 cm), depending on installation environment, soil conditions, and load requirements. In high-load areas such as roads or backbone routes, burial depth can reach 48 inches (120 cm) or more. Underground cables are pulled in conduit that is buried underground, usually 1-1. 2 meters (3-4 feet) deep to reduce the likelihood of accidentally being dug up. For broader context on underground. ion) and “ Installed” (after installation). The following formulas may be used to determine general guidelines for installing Corning Optical Communications fiber optic cable; however, refer to the cable specifi simply double the minimum working bend radius. However, simply hitting this depth isn't enough to guarantee your network survives.