The doomsday fortress, which can withstand nuclear strikes and allow people to survive for a long time in the underground city, does such an underground city really exist,Salman swallowed after listening to Xu Huasheng's words.,"Of course, it's just a bit more expensive." 。The entire doomsday fortress is actually a huge monolithic structure. During its construction, it would use caisson construction methods to continuously sink the building underground. Ultimately, it could potentially sink hundreds of meters underground. You can imagine this structure as a super skyscraper sinking hundreds of meters underground. It has an independent energy system and a capable ecological system... Xu Huasheng said directly: 。The design plan for the Doomsday Fortress was actually already in place. 。But this thing is too expensive to build. Constructing such a fortress is like using caisson technology for piles, slowly sinking the entire structure underground. When the depth is sufficient, even a nuclear attack won't be able to damage the underground city. 。Saliva, Salman could hardly contain his drool. 。This thing is great, a super turtle shell. If anyone hits us, they can't beat us, just dive into this, no one can do anything about it. 。This base can also produce things, and if it can't beat them, it hides and accumulates over time before counterattacking. 。"Xu, how much money would it take to build such a doomsday fortress" 。"Your Highness, this is hard to say. It depends on the scale and the specific construction difficulty." 。This thing is not something that can be built just anywhere. 。A specialized geological exploration team must first conduct an exploration and select a suitable location. 。Then, based on the geological conditions, design and construction plans are formulated, and the construction methods are determined. It also depends on the internal configuration. 。For example, building a doomsday bunker that can accommodate millions of people. If the geological conditions are favorable and the construction difficulty is low, it might be possible to build it for one or two hundred billion dollars. 。"But if the difficulty is high, it might take four or five hundred billion dollars, or even more..."。