is now available on audio!Format: Paperback book & CDNarrator: Cassandra Morris, Polly Adams, and a cast of children.

When Ms. Frizzle drives the Magic School Bus full speed ahead into the ocean, the class takes a submarine expedition that's anything but ordinary. With a well-meaning lifeguard in tow, the class takes a deep breath and learns about hot water vents, coral reefs, plant and animal life on the ocean floor, and more!