My neighbor had a shallow wire burried next to steel fence posts. Lightning blew the wire out of the ground. Wasn't much left of the wire either. It damaged the wire in multiple places too. I think the lightning may have hit a tree and found it's way to the fence.
Another farmer had to put his wire 10ft underground, lightning blowing load centers off the wall.
When I run an undergound wire, I put it at least 3 ft and then run a water line too. Nice to have water next to the barn.
Don't you have to have grounding rods all over the place in Florida?