A medium shot from a side view captures a unique humanoid alien swimming gracefully through a dark, icy underwater cavern. The creature features a hybrid fish-mammal anatomy with a streamlined torso, a dorsal fin running along its back, and gills on its neck. Its entire body is covered in thick, insulating white and pale blue fur, under which bioluminescent markings glow with a faint light. The alien has large, completely black eyes without pupils, webbed hands and feet, and an expressive face, maintaining an upright bipedal posture as it glides through the water. The environment is a deep-sea ice cavern where ethereal blue light filters from above, illuminating floating ice crystals and jagged frozen walls. The visual style is a high-quality anime illustration with cinematic lighting, evoking a mysterious and cold deep-sea atmosphere with a professional, documentary-like composition.