When Go-Joe arrives to see his friends Feena and Pablo, they are playing a 'sink or float' game with objects in the paddling pool. Sarah-Jane joins them and their game gives her an idea: she takes them to a swimming pool to meet Kalie, who teaches them how to swim on their backs and dive for things that have sunk to the bottom of the pool - just like in their game! They also learn how to dive safely into the water.