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gas lines are usually buried 450 and 600mm deep. Gas to a house is most likely around 18 inches for the house line around 30 to 36 gas main and water is around 3 to 4 feet towards the north where it gets cold. I guess you know the electric and phone could be buried too.
While most conventional gas can be found just a few thousand meters deep, deep natural gas is located in deposits at least 4,500 meters (15,000 feet) below the surface of the Earth. Drilling for deep natural gas is not always economically practical, although techniques to extract it have been developed and improved.