Join Detective Marina and her curious students on a magical journey beneath the waves in their classroom-shaped submarine. When the coral gardens suddenly begin to disappear, the children meet talking sea creatures, glowing jellyfish, a friendly dolphin named Captain Bubbles, and the mysterious Coral Queen who guides them through the secret world of the ocean. Filled with vibrant illustrations, gentle humor, and simple lessons about teamwork, kindness, and protecting nature, this colorful comic-style book offers a delightful underwater adventure for young readers aged 4 to 8.