breakaway civilization

A term first coined by UFO researcher, Richard Dolan, back in 2010. The term is his description of a particularly wealthy and powerful sub-set of the human race whom he believes have been secretly amassing for themselves exotic and highly advanced technology. Via this hoarding of high tech for themselves (and by keeping it from the rest of the world) these highly-placed elites actually live secret, hidden lives of extreme opulence and leisure. He has even postulated that via this advanced tech, they have built separate cities for themselves, located ether in remote places (such as underground, or on the ocean floor, or within the mountains of Antarctica, etc), or even off world.

The 2013 Matt Damon movie "Elysium" had a similar premise involving a massive, self-sustaining city that orbited the Earth and was the exclusive domain of the very wealthy. The only difference here is that in the movie "Elysium," the titular orbital city was not a secret, but rather its existence was fully known about by all peoples of Earth who could clearly see it orbiting overhead. The city was merely inaccessible to anyone who was not a wealthy elite.