The HDD process for cable installation typically involves three main stages:

1. Pilot Bore: The machine drills a small-diameter pilot hole from a designated entry point to an exit point, following a carefully planned path to avoid obstacles.

2. Pre-reaming: A reamer is attached to the drill string and pulled back through the pilot bore to enlarge the hole to the required diameter for the cable or conduit.

3. Cable Pullback: The cable or conduit is attached to the reamer with a Swivel, and the rig pulls it back through the enlarged bore, completing the installation with minimal surface disturbance.