Sewer line replacement

Our ancient sewer line collapsed on Friday morning, sadly. It was evidently made of Orangeburg pipe, which is a pipe developed during WWII that is made out of tar paper. It turns out that tar paper has a life span of 20-50 years and eventually it is going to fail. Ours broke, split and got holes in it which mud began falling into and filled up the pipe and blocked it. Now we are having it all replaced, as are many many other people around here - evidently the plumber does 100 of these a year in town. It is almost done but has required a lot of digging in the back yard and into the neighbor's back yard, because the sewer line runs under the neighbor's yard (rather than running out toward the street, the utilities here are in the back). Many thousands of dollars later, at last we have a sewer that will be working fine.