Hi. New here. I own a house in that area. The one thing I keep thinking about is why there dug up an old in ground oil tank. These tanks are buried deep and have a 4-6 inch access pipe (to refill oil). Anything that would fit into the pipe should drop down far. It would explain why there isn’t disturbed earth from digging.
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Oil tank makes sense. It looked like a huge round cylinder that had come open like a clam shell. Best as I could tell. Cell phones and shotguns could be dropped in there?
But, they are ow building retaining walls in the hole, so it looks like there will be some human hands digging in there soon.