Today I found a hole in the walkway between my house and my neighbors's. The hole is not big on the ground but when I use my flash light to take a look, I was quite shock as it is quite big and hollow deep down, at least 2 to 3 feet deep and 2-3 feet in width. The hole appears just right outside my backyard fence door and extend underneath to my neighbour's side.
Could this be possible a sinkhole? Any professionals out there who could give advise?
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