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An underwater cyberpunk cityscape illuminated by a glowing soul gem. A translucent chamber carved from coral and glass floats in a submerged plaza, housing the gem which radiates with haloed inner runes and a pulsating core like captured breath. Neon-blue, magenta, and cyan light filters through briny water as bioluminescent kelp sways around chrome-plated submersibles and holographic signs. A sleek diver in a luminescent exosuit studies the gem, its facets revealing fleeting ghost-like silhouettes of souls trapped within. Drones drift like metallic jellyfish, leaving trails of electric glow. The distant skyline shows sentinel towers encrusted with coral, submerged streets and schools of robotic fish weaving through cables. The scene is hyper-detailed, cinematic, with heavy volumetric light, moody shadows, and a sense of mystery, weightlessness, and awe.