Traditional trenching - If your pipes are extremely damaged beyond repair, professionals will recommend trenching and replacing the pipes manually. The process is very invasive, and you will have to repair your damaged yard, floors, or walls. Unfortunately, it's the only solution to pipes that have collapsed, disintegrated, or are back-pitched.*
*Sewer lines should be sloped away from your home, down towards the city connection. A back-pitched pipe is a sewer line sloped toward your home in the wrong direction.