Cinematic science fiction scene, beneath the polar ice cap on Lidong, the winter-beginning solar term. A sleek white-and-orange research submarine glides through deep blue water under a vast ceiling of fractured sea ice, pale light shafts breaking through cracks above, tiny bubbles trailing from its stern. Through a large glowing viewport, two scientists in orange suits watch a school of small silver fish, while a small drone with headlights probes the darkness ahead. Deep blue and teal palette with warm amber interior light, volumetric god rays, fine hull panel detail and frost on the ice ceiling, sense of scale and quiet wonder, no text, no watermark, no logo, 3:2 landscape composition.