[ It also pays to pay attention to property lines.
Apparently this guy dug under his neighbour’s yard and that’s probably how the city found out. ]
Then it should be between him and his neighbor with the government arresting him/ fining him on behalf of his neighbor, not as a function of the government into itself.
Maybe he told the neighbor to go pound sand?????. If a neighbor was going this on my property and did not stop after beig told to I would be calling the authorities also.