"Ernie - I work for a local Telephone/ISP and got these pics. You may or may not know about the law requiring you call for utility locating before you do any excavation. The pictures below are a result of a guy using a post hole digger with out calling for "locates" and he hit an underground cross county gas pipe. This happens all the time, just not to this extent. This is what a high pressure gas main is capable of. I remember one guy was just driving in a fence post and hit a telephone line. "It was only a fence post." Dumbass, call first! Anyway, this gives a new meaning to Call Before You Dig. Happy New Year and keep up the good work. Nic"
http://www.ehowa.com/features/callbeforeyoudig.shtml