A camera run through the line shows the pipe’s actual interior condition directly: cracks, root intrusion, bellied sections, offset joints, and the material and general age of the line, rather than inferring any of that from symptoms at the surface. Footage is recorded as the camera travels, so the exact location of a problem is measured against the distance traveled, not estimated.
That location data is what turns a vague sense that something is wrong into an exact spot to excavate or line, which is the difference between opening one section of yard and guessing at several different ones.
This inspection is often the first step before a repair estimate, a real-estate transaction, or a property purchase where the buyer wants documented proof of a line’s actual condition rather than take it on faith alone.