How is a BIG man supposed to work in a space that you can't even get your shoulders into? The space is limited in most plumbing situations and that means trouble. Limited space means there is a strong chance a bump of the elbow or knocking a hand against something and down comes a wrench right in the face. Do you know why the wrench hits the face? Because your more likely to get a Chilean miner out before you can get the BIG man out from underneath a sink.