It includes a bunker with:
-lava
-engineroom
-living_area
.sleeping_rooms
.kitchen
.toilets
.cafeteria
-much walks between
-controlroom
-controloffice
-secrets
-fog
-HDRR

Notice its abunker to live in

The style:

The main part is self explaining image
It is a lone world in the underground. You could call it a bunker.
I would say it is a bunker where some men can survive some time.

Thats the reason for the living area. It shouldn't look like a bunker there.
It shall look nice because they shall live there for some years.

They lava: well its in the underground.....
The engine room: They need energy there.

I know there are some bugs and someday i will fix them.

I know i should learn to model some own models.