Whenever groundwork is done you’re supposed to apply for some kind of permit and part of that process is that they’re supposed to tell you if there’s any underground utilities.
I can’t count the number of times though that our engineers have dug up a fiber line or something that we would demonstrably told was not there. It’s great because sometimes you can see on the pavement that it’s being dug up and resurfaced in a different material so there’s obviously something down there, but the paperwork says, nope we just dug it up for no reason there’s nothing down there go mad.