The theory is that these holes were formed by larva burning away the trees and leaving behind ashes which were eroded away. This theory is problematic. These holes appear in remote forests where its very hard to bring in equipment to dig them.
Maybe there old missle silos they started and forgot about lol how about telling folks 1 How deep are they & Where do they go?
2 Notice they are all very smooth an same size why didnt think eroding was that talented .
2 What dolt said DAH send me down first?
Water rotating very fast like at the bottom of a waterfall or in a whirlpool in a river over limestone rock would cause these. Its called a karst landscape.
Whatever they are they have been cut with something. They are not sinkholes and lava is a very unlikely culprit. UFO Soil testing? Probably not but I can't confirm anything. They could have been crudely cut and the rain would have smoothed out the sides. What I want to know is how deep are they and what sorts of minerals or plant/insect life is in these holes. What are similar between all of them? There has to be something the same about each and every one of them.