Checking Nerd Hole Caves in Tennessee After Work

Some after work fun with my friend, Troy last night. Checking a few nerd holes that a landowner wanted to know more about here in Marion County, Tennessee. One was behind a cool spring/ice house. It seems someone at some point in time also dug open an area near it to be used as possible food storage? The second lead was a sinkhole near a riding trail going up to his hunting area. The landowner says it had opened up since last winter. Upon inspection, there is no limestone and it's just a dirt hole..