My dad had to work in the Matteson (just outside of Chicago) old sewer system. He was a skinny kid back then at 120 lbs and so he had to go down and pass out from the methane as he cleaned the old pipes. It was a parks and recs job. It was his "Thank God I got educated so I never have to do that again" job. It is the dirtest job he has ever seen and the smellest since it was human feces that was about 100 years of accumilation. Hugs all from Idaho - where he lives now thank God