Constellations Over the Underground City

An expansive underground city carved from a vast cave, illuminated by neon lights, bioluminescent crystals, and glowing steam. Rendered in bold American comic book style with thick black outlines, high-contrast shading, and halftone dots. A dramatic skyline of subterranean towers and railways rises from polished rock and river-lit caverns. The ceiling above is a celestial map: constellations glow and are connected with luminous lines, forming mythic shapes as if projected into the air. A lone superhero in futuristic armor stands in a tunnel, cape fluttering, eyes fixed on the star-map above, action lines streaking around him. Textured rock walls, dripping water, and graffiti in a futuristic script. Color palette of electric blues, purples, pinks, and warm amber highlights to emphasize contrast. The mood is epic, mysterious, and cinematic, like a sci-fi-noir adventure set beneath the earth.