Prompt: Photorealistic video. A giant blue whale and a large shark are gracefully flying and gliding through a beautiful sky filled with soft, white cumulus clouds. The background is a vivid, deep blue sky. Low angle shot looking up. Below the clouds, there is a vast, lush green forest with tall trees. The whale and shark move slowly, like they are swimming underwater. Sunrays piercing through the clouds, casting dynamic shadows on the forest. Cinematic lighting, 4k, high detail, majestic and serene mood.