Most of our understanding of animal behavior comes from observation in their natural habitat. It would seem nearly impossible to observe this behavior for undersoil.
Another great example studies of mycelium networks exchanging nutrients with forest tree root networks. The exchange of nutrients has much in common with the firing of neutrons in the animal brain. This was discovered by "feeding" trees radioactive CO2 gas and observing how it moves to other trees. https://onlinelibrary.wiley.com/doi/full/10.1111/mec.15520