massive underground evolving bunker...

massive underground evolving bunker base designed for survival progression, starting as a small primitive survival shelter and expanding into a highly advanced futuristic megastructure, coherent architectural evolution across all zones, central axis layout with a main corridor and modular side rooms, vertical multi-level design early stage: small rough bunker carved into stone, cobblestone and dirt walls, wooden supports, torches, basic survival setup with furnace, chests, bed, cramped but सुरक्षित atmosphere mid stage: organized underground base with stone brick and andesite structure, central corridor with symmetrical branching rooms, storage room with chests and drawers, furnace room, early farms, structured layout, lantern lighting, clean but still grounded survival aesthetic indust