Thanks for the tips. That was my biggest worry, doing all that digging and nothing being down there. It looked like someone was using it to dump trash in at one point. I may give it a go.
I recently discovered an old school foundation in some woods. Off to the side is a pretty good size hole. I could stand in it and be waist level with the ground. The school dates back to the late 19th century. I started to dig a bit and was pulling out stuff from the 40s and 50s. Nothing too...