A breathtaking underwater realm filled with fantastical marine creatures and glowing coral formations. The seafloor is covered in colorful plants and luminous crystals, casting a magical light throughout the scene. Schools of shimmering fish swim alongside mythical beings like mermaids, sea dragons, and jellyfish with translucent, glowing tentacles. Sunbeams filter through the water, creating dappled light and adding to the ethereal atmosphere. The background reveals ancient ruins of an underwater city, covered in coral and surrounded by mysterious sea life.