While visiting their uncle, Billy and Sheena do a little underwater exploring. Uncle Deep warns them to stay away from the coral reef, but Billy can't resist. He's not alone in the reef, there is something lurking, something dark and scaly... half-human, half-fish!

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.

"Leah is changed. Months earlier, she left for a routine expedition, only this time her submarine sank to the sea floor. When she finally surfaces and returns home, her wife Miri knows that something is wrong. Barely eating and lost in her thoughts, Leah rotates between rooms in their apartment, running the taps morning and night. As Miri searches for answers, desperate to understand what happened below the water, she must face the possibility that...

A discovery by submersible designer Hannah Bryson suggests a possible cause of mythical Atlantis's mysterious demise that has potentially cataclysmic consequences for the modern world.

A nineteenth-century science fiction tale of an electric submarine, its eccentric captain, and undersea world, which anticipated many of the scientific achievements of the twentieth century.

"To stop the world from burning, it's up to Sigma Force to uncover a secret buried at the heart of our planet. The Titan Project-an international research station off the coast of Australia-discovers a thriving zone of life in an otherwise dead sea. The area teems with a strange bioluminescent coral that defies science, yet holds great promise for the future. But the loss of a military submarine in the area triggers a brutal attack and sets in motion...

East Antarctica: The coldest, most desolate location on Earth. Two-and-a-half miles below the ice cap is Vostok, a six thousand square mile liquid lake, over a thousand feet deep, left untouched for more than 15 million years. Now, marine biologist Zachary Wallace and two other scientists aboard a submersible tethered to a laser will journey 13,000 feet beneath the ice into this unexplored realm to discover Mesozoic life forms long believed extinct...

"Explores methods and devices scientists use to explore the ocean, walking readers through the history, current developments, and potential for future discoveries, as well as the challenges scientists currently face. Includes infographics, discussion questions, and two "Scientist Bio" features highlighting people who've done important work studying the deep sea"--

When the Octonauts, a team of eight animals that explores the ocean, help a lonely monster, everyone learns the value of friendship and individuality.