Professor Cuddlefish, professor of chemistry, biology, and the geography of coral reefs, has gathered his students for their class at Phylum Molluska University. Two of his students, Zostera and Sepia, are giving presentations on their wonderful ability to change color when graduate students Papuensa and Elegans burst into the classroom with alarming information on the breathable water. Professor Cuddlefish must decide whether to stay with his wife Marianna and children, Latimanus and Pfefferi, or venture out to save their beloved lagoon