Four children from very distant countries embark on a long journey to a new city. They are adopted by new families. These are the four travelers. A new life begins for them. One day, at school, the teacher talks to them about the sea, its vastness, its diversity of species, and its beauty... The children imagine a whole separate marine world. The teacher decides to take a trip to the aquarium. The four travelers dive fully into the world of fish, and all the children happily explore the depths of the ocean. Will they become fish too?
