Isn't this the plot of BioShock? If this sounds like a dorky joke post, it's not. Isn't this literally motivated by the same neo-fuedal oligarchical narcissism that made the bad guy in BioShock build essentially the same thing as this? Tell me one of these "seasteads" won't get hit by some speedboat pirates and decide OK, we're gonna arm up and hey why not build down? And you know what? No one's gonna say we can't do…
Sure, it is obvious when spelt out, but it is less obvious when it is a game of implications.