In some parts of France, you can’t dig without getting a specialized surveyor inspection and certificate it’s safe to dig this deep in that place first.

Absolutely. In my country it is mandatory to submit an UXO report as part of getting the building permit for nontrivial stuff. Most of the time this is boring office work (Was there a strategic target nearby during WWII? Are there any records of bombing happening here? Have there been earthworks in the last 70 years significant enough to rule out anything still remaining?) and you get a report noting that there's no risk expected, but sometimes you have to call in the cavalry and go searching with ground-penetrating radar.

It's just part of doing business, really. Same story with archaeological remains, chemical contamination, or threatened animal species.