I had a huge 'tunnel' behind the house, from the neighbor putting in a fence, it was weird. I researched, found tunnel fill and tunnel plug and used them both. The hole is filled and didn't sink as of 2 weeks now. I then used both those products on about 10 or more rodent holes, maybe moles? or voles? or chipmunks? And, again, so far, so good.
Thanks, Wonder Soil for a solution to my 'hole' problem. :-)
