In my world, a group of scientists decide that they have had enough of the current world. They decide that it's too late to fix the current system, so they set out to start a new one from scratch. Unfortunately, they are stuck trying to find a good place to start building.
My question is, where do we put our brand new idealistic society? I've been reading about the Derinkuyu underground city and while their motives are up for debate, I'm especially curious if something similar could work in modern times. On the other hand, would an underwater city be a practical solution? Both of these situations allow seclusion from the outside world but I'm curious if anyone can think of a more realistic solution.
They want to be secluded but not necessarily completely separate from the rest of the world and would like to trade and have a say in global matters as need be (they are not a cult or a terrorist group).
The story is set ~20 years from now. Lab grown food, 3D printing, clean energy production and robotics are mature and common place. Space travel is still in its infancy, but we are in the process of building a base on Mars (robotic crews are currently building the base before humans arrive)
In my mind, the question basically comes down to this. What is the most reasonable place to put a micro-nation that isn't outrageously expensive, can be done with modern or easily foreseeable technology and provides seclusion without completely separating them from the outside world?
EDIT: I've decided to make the group hardline science idealists. They would want to be reasonably secluded so that they only have to interact with other nations when they want to. Check out the revised criteria above.