How is the facility set up? is it underground; above ground, or are some parts of it under ground and above ground?

I think it's underground with some bits and pieces above ground, it probably looks like a simple military base from above but is a huge facility underground, seeing as both the gates are acessible through elevators.

Thought so. I just wanted some confirmation from the developers. There seems to be differing thoughts about how the facility actually was built.

So yeah, most of it is underground.

Thanks for the clarification. I knew most of it was underground. Mos t people think that it's above ground