Animate a serene underwater scene featuring sharks, seahorses, fishes, and sea turtles swimming and dancing gracefully. Ensure that each creature's movement is smooth and steady, exuding fluidity and grace. Integrate realistic water movements and bubbles to enhance the authenticity of the environment. Pay close attention to maintaining the sharks' body proportions, ensuring they swim forward without any distortion or unnatural bending. Similarly, preserve the natural proportions of other sea creatures, such as fishes, seahorses, and sea turtles, as they move in their respective forward directions. The animation should convey a sense of tranquility and harmony, inviting viewers to immerse themselves in the beauty of the underwater world.