shot 1:Based on the reference portrait image: At the beginning of the video, the character stands still in place, maintaining the original outfit and posture. Suddenly, clear water flows in slowly from the very bottom of the frame, the water level rises gradually, submerging the ground, ankles, calves, and eventually waist. As the water level rises to the chest, the character puts on a professional full-face diving oxygen mask, adjusts breathing, switches from standing to swimming posture, and starts swimming forward in the water with natural and smooth limb strokes. The background transitions seamlessly from the original scene to a deep underwater environment as the water level rises: sunlight filters through the water surface to form dappled light, tiny bubbles and plankton float around, the overall atmosphere changes from a daily ground scene to a quiet underwater world, with realistic water flow texture, smooth and coherent movements, 4K high definition, cinematic lighting