large tunnels being dug through soil from the drainage hole

im having some problems in my closet i have 11 plants at various stages of flowering ive recently started waking up to find large piles of soil outside the drainage holes and 4 to 6 inch tunnels dug through the soil has anyone experienced this before and if so what would be the cause the first thing i thought was mice but havnt seen any in my place
also is this going to cause alot of stress on my plant i cant afford to turn hermie i have a large shiva skunk 2wks from finish and she was the recent victim this mornin it almost seems as if w.e it is is eating the roots as the soil piles contain no roots

Put metal mesh around the pots. Put traps out. Wrap the trigger with dental floss(unwaxed) and bait with peanut butter.