Chirri and Chirra are pedaling along when they find a cave. At the end of the tunnel, they see a light. Oh! They are under the sea! They pedal through a maze of color and pass through an opening in the seaweed, into a scene of seashells of all colors and shapes. Naturally, they come upon sea treats, such as parfait a la conch and marine soda jelly topped with pearl cream. This is the happy, lovely world of Chirri and Chirra, where they stumble on the most wonderful surprises.