Captain Barnacles tangles with a Colossal Squid who has his hooks in the Octopod, Peso babysits a bunch of penguin chicks stuck in a blizzard, Kwazii has a shocking encounter with an Electric Torpedo Ray, and much more!

Readers make choices that determine the outcome of the story when, while exploring the seas for the lost continent of Atlantis, they are separated from their diving vessel.

Two shy children meet at a noisy pool and dive beneath the crowd into a magical undersea land, where they explore a fantastical landscape and meet various creatures.

Cookiecutter sharks: Captain Barnacles and the crew investigate why mysterious holes have started to appear in their equipment -- Lost lemon shark: The underwater explorers go in search of a lemon shark that has hurt its nose and is struggling to find its way home -- Dwarf lantern shark: Captain Barnacles and the team try to find an injured dwarf lantern shark -- Giant jelly: The crew tries to rescue Peso when he becomes trapped inside a giant jelly...

An anti-globalization activist learns how to artificially trigger a polar shift. He plans to use the event to jolt industrialized nations into corrective action. Unfortunately, unless NUMA Special Assignment Team can stop him, his "wake-up call" could annihilate the entire population of the world.

In this story inspired by Jules Verne's "20,000 Leagues Under the Sea," Ana Dakkar, a freshman at Harding-Pencroft Academy, a five-year high school that graduates the best marine scientists, naval warriors, navigators, and underwater explorers in the world, makes astounding discoveries about her heritage and puts her leadership skills to the test against deadly enemies from a rival school.

"Max is told that an island in the Indian Ocean has been flooded by a freak surge of water. The DFEA suspect sinister underwater forces are at work, and Max can't wait to dive into his third mission"--

"Shipwrecked! is an adventure-filled nonfiction book for young readers about the most captivating shipwrecks from history. Combining new research, stunning archival material, and vivid storytelling, Shipwrecked! dives deep into the world of marine archaeology and shows young readers what each discovery reveals about the world before our time"--

The author relates some of her adventures studying and exploring the world's oceans, including tracking whales, living in an underwater laboratory, and helping to design a deep water submarine.