OOC: lol the entire complex is underground, and all the entrances are well hidden, not just viusually, but on the sensors, due to the minerals in the ground (useless rocks otherwise

) But, the entire city was built underground, in case the Chozo were being hunted to extinction, they could have it serve as a safe haven, out of the eyes of the world. They could "disappear like ghosts" and no one would know where they went.

Its much better than a cloaking field that would be possible for enemies to pick up.

But with a planet that is an underground system of cities and fleet hangerbays, they could place the remaining populace, and their technology into a safe place, and simply disappear from people's radar, till they have recoupped, and regained streangth. There is also a possible two other planets that could have hidden cities within them, but they may or may not have the same minerals

Basically, the design of the complex is that the core of the planet is shielded, allowing various pipes to vent the heat into the crust and the city, to assume its normal heat through the years. Meanwhile, cities can be stacked on tope of eachother, with layers of rock and metal between them, layering the planet's core. With this, the entire Chozo race could be squeezed into one planet, though with not too pleasant circumstances, and be able to rebuild their empire. So, in short, NYC, in a layer around the core, at about half the distance between the core and the crust, and then another layer on top of that, and again, and again, while leaving around two massive hangers for their fleets. :3