I've become nauseated with the recent obsession with colonizing Mars, mining the moon or asteroids, and spending resources on intermittent power production from wind, solar, and batteries. I've looked at numerous sources of energy production and have come to the conclusion that instead of looking to the sky, one ought simply dig deeper. The Earths mantle is essentially an inexhaustible source of energy via injecting water for high-pressure steam extraction. Furthermore, we have barely begun mining deep into the Earth core for heavier elements and other resources, which are imperative for economic growth and prosperity. Energy is carbon neutral available 24/7 and there's no need for the expensive and labor intensive production of batteries to store energy. A third issue that gets solved is desalinization of water if there is such a need, which there is. On so many levels this seems like the most cost-effective and cheap and abundant source of energy just lying below our feet. I would be interested in getting to know why hasn't the simple issue of drilling holes as deep as possible and extracting energy via heat never taken off?