It already has: * Resources: lengthy tunnels, caverns, pipes and open pits are already bringing a wealth of subsurface minerals, salts, diamonds, hydrocarbon

It already has: * Resources: lengthy tunnels, caverns, pipes and open pits are already bringing a wealth of subsurface minerals, salts, diamonds, hydrocarbons and other ores for the use of humans. * Energy: geothermal energy is used now and is often deployed in places where portions of superheated mantle are closer to the surface, like near volcanoes in Iceland and Costa Rica. * Living space: subsurface living space is less common due to human's aesthetic preference for "natural light." However even as long ago as the 1800s US West people built subsurface dwellings as depicted in author Laura Ingalls Wilder's book "The Banks of Plum Creek." [0] 0. https://sitesandstories.wordpress.com/tag/the-dugout-site/ https://sitesandstories.wordpress.com/tag/the-dugout-site/