Answer: The HDD process is typically completed in three main stages:

1. Pilot Drilling: A small pilot hole is drilled from the entry point to the exit point along a planned path. A specialized drill head with a built-in transmitter allows the operator to precisely steer the drill and monitor its location, depth, and direction in real-time.

2. Reaming: Once the pilot hole is complete, a reamer is attached to the drill string. The reamer is pulled back through the pilot hole, enlarging it to the size required for the cable or conduit. This process may be repeated with larger reamers to achieve the desired final bore diameter.

3. Pipe Pullback: The final stage involves attaching the conduit or cable to the drill string via a pulling head. The drill rig then pulls the pipe or cable assembly back through the pre-reamed hole to the entry point, completing the installation.