Pipì, Pupù and Rosmary hope to find Mapà on the other side of the Ocean and so they decide to ask the Moon to accompany them to the other side. The Moon agrees, but tells them it won’t be able to take them completely across in one night because it’s too far, so perhaps it could drop them off on an island in the middle of the ocean, before sunrise, where they could then, during the day, continue their trip along with the Sun. And so, happy and satisfied, our trio accept the gracious offer and are dropped off on a little island which soon, however, turns out to be the back of a shark. At first the shark wants to eat them for lunch but then, hearing of the purpose of their trip, decides against it and indeed helps them and takes them on a journey of the deep blue sea. At the bottom of the sea Pipì, Pupù and Rosmary discover a wonderful world they didn’t know existed and at the end of this ‘tourist trip’ they heartily thank the big fish for the gift he has given them, and they continue their journey towards the other continent, accompanied by the Sun.