We recently moved into a new to us house. There are a couple of depressions in the asphalt driveway that I thought I should try to level with some bagged asphalt patch.
Maybe unsurprisingly, when I swept the dirt and loose debris out of one of them, I found that there was a hole straight through the asphalt and into a void in the soil below. I am thinking this is an animal burrow, since I have found another void just under the soil surface nearby which I was able to confirm is a burrow.
My thought is that I could break away an opening in the asphalt large enough to gain greater access, fill the cavity to the best of my ability with crushed stone and then cover with and tamp the patch material.
I realize of course that if there is a burrow that close to the surface, it may manifest in other locations over time which I'll have to address too.