Identify an existing opening or drill a minimum 20mm diameter hole into the surface to create an entry point.
Tie the cable to the tail end of The Ferret ready to be pulled, and insert the head (wheel end) into the opening.
Direct it using the body in alignment with the intended direction and feed it through until it reaches the required location.
Pull the Ferret through the opening to reveal the cable, and untie ready for use. Then Coil it up ready for the next job!