How deep can voles dig?
Not to flog a dead, um, rodent, but ... how deep underground can a vole possibly dig? I'm trenching in heavy duty Â¼" stainless steel mesh 18 inches in an effort to keep them out of the vegetable garden once and for all, since they've managed to dig under and bite through the current hardware cloth version. I could bend the bottom 6" outwards to make a horizontal shelf. Is there any chance that they will tunnel down far enough to reach it? If not, I want to skip the hassle.
The material is 4' wide, so either way it will extend at least 2' above ground as well.