User blog comment:1onskates/BioShock 3: The Rise of Rapture/@comment-76.126.169.47-20131106042208/@comment-6024608-20131106083923

"built as a last resort if anything went wrong in rapture"

so a whole game set in a place no bigger than a WW@ city bomb shelter  (the germans had some that could hold 10000 people - at least for a while)