Palmer Luckey predicts the next great warfighting domain is subterranean, with vehicles moving through the crust of the earth "Everyone says that I'm nuts for this, and I'm going to keep saying it because it is true. The U.S. used to believe this. The Soviets used to believe this. Both countries were working on subterrenes, so vehicles that could move through the crust of the Earth." "A lot of people, when you say subterranean, what that currently means is fighting in tunnels, fighting in trenches, fighting in collapsed-in buildings or bunkers." "I am talking about the real deal, no-shit subterrene fight, where you are using the crust of the earth as a three-dimensional maneuver and battle space, and you have vehicles moving through it, people moving through it, supplies moving through it, and you could have fights that are fought entirely in this domain or using this domain to hit things on the surface, in the air, and subsea." "And there are a lot of things that have happened that make it a lot more viable." _____ Source: AIAA