At first, only a few things are known about the celestial object that astronomers dub Rama. It is huge, weighing more than ten trillion tons. And it is hurtling through the solar system at inconceivable speed. Then a space probe confirms the unthinkable: Rama is no natural object. It is, incredibly, an interstellar spacecraft. Space explorers and planet-bound scientists alike prepare for mankind's first encounter with alien intelligence.

It has been 40 years since the publication of this classic science-fiction novel that changed the way we look at the stars and ourselves. From the savannas of Africa at the dawn of mankind to the rings of Saturn as man adventures to the outer rim of our solar system, 2001: A Space Odyssey is a journey unlike any other.

When itinerant cave diver James Tighe receives an invitation to billionaire Nathan Joyce's private island, he thinks it must be a mistake. But Tighe's unique skill set makes him a prime candidate for Joyce's high-risk venture to mine a near-Earth asteroid - with the goal of kick-starting an entire off-world economy. The potential rewards and personal risks are staggering, but the competition is fierce, and the stakes couldn't be higher. Isolated and pushed beyond their breaking points, Tighe and his fellow 21st-century adventurers must rely on each other to survive....

On a top-secret dive into the Pacific Ocean's deepest canyon, Jonas Taylor found himself face-to-face with the largest and most ferocious predator in the history of the animal kingdom. The sole survivor of the mission, Taylor is haunted by what he's sure he saw but still can't prove exists-Carcharodon megalodon, the massive mother of the great white shark. The average prehistoric Meg weighs in at twenty tons and could tear apart a Tyrannosaurus rex in seconds.

Ana Dakkar is 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. Ana's parents died while on a scientific expedition two years ago, and the only family's she's got left is her older brother, Dev, also a student at HP. Ana's freshman year culminates with the class' weekend trial at sea, the details of which have been kept secret. She only hopes she has what it'll take to succeed.

The Ice Diaries tells the incredible true story of Captain William R. Anderson and his crew's harrowing top-secret mission aboard the USS Nautilus, the world's first nuclear-powered submarine. Bristling with newly classified, never-before-published information, The Ice Diaries takes listeners on a dangerous journey beneath the vast, unexplored Arctic ice cap during the height of the Cold War.

Humans, unlike other animals that are drawn to water, are not natural-born swimmers. We must be taught. Our evolutionary ancestors learned for survival; now in the 21st century, we swim in freezing Arctic waters and piranha-infested rivers to test our limits. Swimming is an introspective and silent sport in a chaotic and noisy age; it’s therapeutic for both the mind and body; and it's an adventurous way to get from point A to point B. It's also one route to that elusive, ecstatic state of flow.

When the Imagine Network commissioned a documentary on mermaids, to be filmed from the cruise ship Atargatis, they expected what they had always received before: an assortment of eyewitness reports that proved nothing, some footage that proved even less, and the kind of ratings that only came from peddling imaginary creatures to the masses.

Susan Casey is our premiere chronicler of the aquatic world. For The Underworld she traversed the globe, joining scientists and explorers on dives to the deepest places on the planet, interviewing the marine geologists, marine biologists, and oceanographers who are searching for knowledge in this vast unseen realm. She takes us on a fascinating journey through the history of deep-sea exploration, from the myths and legends of the ancient world to storied shipwrecks we can now reach on the bottom.

Based on his historic mission to the International Space Station, Ask an Astronaut is Tim Peake's guide to life in space and his answers to the thousands of questions he has been asked since his return to Earth. With explanations ranging from the mundane (how do you wash your clothes or go to the bathroom while in orbit?) to the profound (do humans have a duty to explore the unknown?), all written in Tim's characteristically warm style, Tim shares his thoughts on every aspect of space exploration.

At the turn of the 22nd century, scientists make a breakthrough in human spaceflight. Through a revolutionary method known as somaforming, astronauts can survive in hostile environments off Earth using synthetic biological supplementations. With the fragility of the body no longer a limiting factor, human beings are at last able to journey to neighboring exoplanets long known to harbor life. A team of these explorers, Ariadne O’Neill and her three crewmates, are hard at work in a planetary system 15 light-years from Sol, on a mission to ecologically survey four habitable worlds.

Blending personal experience and real-world events in a fictional wrapping, Operation Ivy Bells offers a never-before-seen glimpse of these heroic men fearlessly facing death to gather the intel that tipped the scales to win the Cold War.

When Nicole Stott first saw Earth from space, she realized how interconnected we are and knew she had to help protect our planetary home. In Back to Earth, Stott imparts essential lessons in problem-solving, survival, and crisis response that each of us can practice to make change. She knows we can overcome differences to address global issues, because she saw this every day on the International Space Station. Stott shares stories from her spaceflight and insights from scientists, activists, and changemakers working to solve our greatest environmental challenges.

Major Chenesai Okonkwo is an auditor for the Sub-Saharan Union. Her mission: to find out if the Sixth Expeditionary Force's newly discovered time gate has been compromised. Is the union's revolutionary discovery already doomed, 11 years in the future? But there is another, more personal mission. The possible murder of her husband remains unsolved. But are the two things connected? Can she navigate the world of aliens, spies, politics and time paradoxes to find the truth, and save her people's future?

In this remarkable, groundbreaking audiobook, a documentarian and conservationist, determined to dispel misplaced fear and correct common misconceptions, explores in-depth the secret lives of sharks - magnificent creatures who play an integral part in maintaining the health of the world’s oceans and ultimately the planet.