Dive into a mesmerizing underwater city where vibrant coral structures twist and turn into breathtaking architecture. Depict coral skyscrapers adorned with bioluminescent accents, surrounded by schools of colorful fish and graceful manta rays. Sunlight filters through the water’s surface, casting shimmering patterns on the cityscape. This fantastical environment combines nature and imagination, showcasing a lively ecosystem thriving amidst human creativity—all beneath the tranquil blue ocean.