Ms. Frizzle takes the class on a trip to Hawaii, where the Magic School Bus provides them with individual submarines, and they learn about fish schools and the behavior of undersea animals--and try to avoid being eaten by a shark.

Snow day, snow way! -- Motion to ocean -- In it to fin it -- Something fishy -- Deepwater digs -- Sink or swim -- Snap to it -- Shark bait -- Better together -- Aloha, Walkerville.