Water, sanitary sewer, storm sewer, chiller lines, cable, phone, fiber, natural gas, oil, electric, sprinkler systems, under ground vaults for most of these things as well. Some cities have underground tunnels for things like storm over flow, communications, electric and various other things.

I'm answering this from a parking lot and from here I can see, street lights, parking lot lights, storm sewer, sanitary, water, bunch of electric coming down a pole as well as cable and phone. I have to assume there's gas as well.