The fate of the Empty Crown after the events of the Exomorph crisis are unknown; they may have been decimated or their organization may still exist within the Romulan Star Empire. However, Kleeya has revealed rumours to the attention of starfleet that a master key has been built, allowing control of exomorphs without the need for a control facility.
I'm not sure what that is on the top. A window with a view into the sky or perhaps some holographic movie.
If it's a window make sure to make the walls larger. At the moment you've got like 10cm thick walls. Little unrealistic don't you think?
Other than that it looks ok. Try to mix the textures more. to much gray in most of your screen shots.
It's actually to let the light in. It's an underground place.
Thanks for all the input and comments you've put.
Curious, are you a modder?