"Where did all the water on our planet come from? How deep is the ocean? What exactly is a fish? Find out all of this and more in the newest Professor Astro Cat adventure! Despite covering over 70% of the Earth's surface, the ocean is still roughly 95% unexplored. Join Professor Astro Cat and the gang as they take a deep dive from the sea shore all the way to the darkest depths of the ocean floor to find out more about this mysterious watery world. From coral reefs to deep-sea vents, there's so much to discover on this Deep-sea Voyage." -- Provided by publisher.