[Rarok]

Diggning a hole is: tons of paperwork, why are you doing, risks, licences for every machine you are going to use, studie that probes that you aren't going to damage any underground tube, cable or even if you are going to affect to the natural water-flow. Then you also need to explain how you are going to close the hole...

[derrida]

Yeah, I occasionally work in construction. In .au you have to have a Civil Engineer on site for anything like 2meters or more deep and so on, council approval, engineers reports, water course layouts, surveyors, soil experts, excavators required skilled labor (in the sense proof of competency & licenses) I don't know what OP is getting at.