Something to consider is that even at those depths there are bacteria and living things in the soil. Depriving them of heat, might disrupt another ecosystem tha

Something to consider is that even at those depths there are bacteria and living things in the soil. Depriving them of heat, might disrupt another ecosystem that is providing food for things above or below. https://www.bbc.com/news/science-environment-23855436 https://www.bbc.com/news/science-environment-23855436