Some people have to dress up in a special suit and swim through raw sewage to repair a big pump - and they have to do it blindly because the sewage is opaque. Some people have an even dirtier job: They have to clean off that guy's shitty suit before he can take it off. They might have to do it multiple times if he needs to come out to take another look at schematics. They do it because it pays very well. It pays very well because nobody wants to do it.