Directional boring or horizontal directional drilling is a way to get utilities from one point to another without destroying the existing ground or obstacles that are in between the two points.

Horizontal Directional Drilling (HDD) is a construction technique whereby a tunnel is drilled under a waterway or other designated area, and a pipeline or other utility is pulled through the drilled underground tunnel.  The drilling mud also helps coat the walls of the tunnel and remove drill cuttings.

Directional boring, also referred to as horizontal directional drilling, is a minimal impact trenchless method of installing underground utilities such as pipe, conduit, or cables in a relatively shallow arc or radius along a prescribed underground path using a surface-launched drilling rig.