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 nodded in agreement with Xu Huawei's words. 。,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. 。。