A colossal bio-luminescent reef metropolis built into a massive living coral mountain range on an alien ocean world, towering crystalline coral spires pulsing with ethereal glow, suspended transparent tunnels connecting floating reef platforms, schools of glowing fish weaving between bioluminescent kelp towers, sleek submersible vessels gliding through crystal clear waters, deep teal and electric cyan palette with shafts of filtered sunlight piercing the surface above, epic upward shot with tiny diver silhouettes on observation domes emphasizes impossible aquatic architectural scale, photorealistic, cinematic depth of field