What Is Underground Directional Drilling? Techniques, Benefits, And Applications Underground directional drilling (UDD) is a state-of-the-art technique used in the installation of underground utilities such as pipelines, cables, and conduits. It is a trenchless method that allows for the precise installation of materials without the need for large-scale excavation or disruption to the surrounding area. UDD offers a more environmentally friendly and efficient alternative to traditional open-cut methods, making it a popular choice in many industries today.