A video captures a large whale swimming underwater, appearing to be in an aquarium or a similar controlled environment. The whale is dark on its top and light on its underside, with visible white markings or barnacles. It moves gracefully through the blue water, propelling itself with its tail flukes. The perspective is from below, looking up at the whale as it swims overhead. The background is a deep blue, suggesting depth and the aquatic environment. The lighting is dim, emphasizing the deep blue hue of the water.