Moko is an explorer. As he travels the world continent by continent, he makes many friends and discovers many natural phenomena which sometimes delight him, and other times scare him. Each animated episode recounts an adventure and takes an "original story" approach to explaining these natural phenomena. In this episode, Moko and Mei-Lei are gathering seashells in between the rocks on the white sand beach to decorate the village's houses. Moko asks Mei-Lei if they can go to other beaches to try to find other shells. Mei-Lei likes the idea and goes to ask a fisherman to take them to another beach on his boat. Just beyond the village Moko sees a vast plain that has been flooded with water. He thinks this must have been the great wave, flooding the field with water so that the rice would grow. This is when Mei-Lei picks up a magnificent seashell and Moko believes that it must surely be a gift from the ocean. Moko and Mei-Lei make their way back home, carrying their gift and happy to have seen wonderful new places. They are certain that the ocean must know an underground passage in which it sends waves every now and then to feed the rivers and the fields.