No, I don't envy plumbers. Many years ago I was working in a new condo development. I was finishing up a panel that was located in a utility closet in one of the units. At my feet was a scuttle hole that accessed the crawl space below. Along comes the plumber with a tubing cutter, torch and some tools and down the scuttle hole he goes. Now, since all the plumbing fixtures were already installed, unbeknownst to this guy all the other trades made use of them for quite some time. Only problem was the 3" copper riser from like 3 floors was capped in the crawlspace and never connected to the cast iron sewer line. Apparently this guy was there to take care if that. I hear him put the cutter on the pipe and give it a turn or two and then all I hear is GET ME A BUCKET QUICK!!