PROMPT:
Vibrant and photorealistic depiction of an underground metropolis, showcasing intricately designed tunnels and caverns illuminated by a kaleidoscope of colors, predominantly featuring electric blues, radiant yellows, and emerald greens, with subtle hints of copper and bronze accents, set against a dark, mysterious background, evoking a sense of wonder and discovery, as if stumbling upon a hidden world beneath the earth's surface.
