We will often dig for other trades such as plumbers, electricians, pool companies. We do it so much that we have our own name for it - "Digging for MEP" The MEP is Mechanical, Electrical, Plumbing.
Digging for sprinklers
Digging out under a piling and grade beam foundation so that a specialist underground air conditioning system can be installed. You can view more about the Blue Duct Underground AC ducting system here
Typical MEP digging