Imagine a vast underwater city built within a giant coral reef

Imagine a vast underwater city built within a giant coral reef. The structures are a mix of bioluminescent organisms and advanced technology, with glowing spires, domes, and arches crafted from seashells and pearls. Schools of colorful fish swim through the streets, and giant, gentle sea creatures like whales and octopuses coexist with the city’s inhabitants. The light from the surface filters down in beams, creating a serene, dreamlike atmosphere.