"Prince Salman, no problem, building an underground city, this is something we are very experienced in. Your Highness, come, let's sit down and talk slowly. What kind of specifications does Saudi Arabia want for its underground city" 徐華盛 smiled and asked. 。"Specs Does an underground dungeon even have specs" 。Of course, different needs mean different specifications. 。For example, an ordinary-level dungeon has the ability to provide shelter and air raid protection, capable of defending against ordinary aerial attacks…” Xu Huasheng began explaining the different levels of dungeons to Salem. 。What is called "grading" is actually just a difference in defensive capabilities. 。Salman listened very attentively, the more he listened, the more he wanted 。"Prince, the last one was amazing." 。The last one is a doomsday-level dungeon, also known as the Doomsday Fortress. 。The scenario is a global full-scale nuclear war erupting, plunging the entire Earth into an apocalypse. 。...And this underground city requires a complete defense against a saturation nuclear attack, and the underground city must have a complete ecosystem to ensure that the underground city can survive forever underground…",A super underground bunker capable of holding millions of people, hidden beneath the ground, would cost hundreds of billions of dollars. But to Salman, that price tag wasn't even expensive, it was practically a steal. 。"Mr. Xu, we want a doomsday fortress like this..." 。But can we use oil to offset the funds... " Salman looked at Xu Huasheng. 。,And there are satellites, this is something only big countries can afford, small countries can't afford satellites.。