The ocean covers 70 percent of the Earth's surface, but scientists say they still know shockingly little about the mysterious, deep blue sea. What lies at the bottom of our oceans?

Experts from Oceana, NOAA and the Consortium for Ocean Leadership describe how chronic over fishing has damaged ecosystems and threatens the entire food chain. But this crisis is solvable. Well-managed ocean fisheries hold out the promise of limitless seafood -- and a home for all sea life.

Renowned marine biologist Dr. Sylvia Earle reveals why the dual threats of ocean pollution and overfishing could have a devastating impact on mankind.

See many of Chile's varied marine animals as a group of dedicated filmmakers tries to have a close encounter with the largest animal to ever live on Earth, the blue whale.

Throughout history, human society has run on trade, and trade moved on the oceans. The innovations that allowed faster and more accurate oceanic travel revolutionized the world. New inventions now help people and goods move on the water faster for recreation and commerce.

Will Cubans be able to safeguard their heritage of pristine Nature and preserved ecological treasures under this new era, as they are facing the combined pressure of money and tourism? What policies can be implemented to maintain the island’s spectacular wilderness?

Great white sharks are one of the most feared predators on Earth, and yet we know very little about them. Science is now revealing the mysteries of this perfect predator through evolutionary biology.

The octopus is as close to an alien being as anything we've seen on Earth. From a feeding frenzy at the bottom of the sea to a mother taking care of thousands of its eggs, travel to the pacific ocean to see them at their best and most weird.

Adaptations in the oceans most colorful invertebrates. Nudibranchs, or sea slugs, have a remarkable range of adaptations to survive in the ocean. From weaponizing stinging cells, harvesting the power of the sun, spraying sulfuric acid, and turning their bodies into drift nets.

Kelp forests harbor a greater variety and higher diversity of plants and animals than almost any other ocean community. Many organisms use the thick blades as a safe shelter for their young from predators or even rough storms. But, what can be done when this ecosystem is out of balance?

Follow a family of sperm whales in the heart of the Indian Ocean. Alongside a team of scientists, who have witnessed their most intimate moments over the past 7 years, we will lift the veil on the largest-toothed predator on earth.

Take a journey with famed underwater photographer Peter Kragh, as he explores the coast of California, and reveals some of the most spectacular life found under the sea.

It all began in Florida in the 80’s when exotic fish aficionados decided to release their lionfish into the nearby ocean waters. In just over a decade, those fish conquered a massive territory at a horrifying speed. Scientists are calling it the worst invasion on the planet.

Shark expert Jim Abernethy conducts stunning, cage-free dives with the ocean’s greatest predators to demonstrate they are not mindless, man-eating monsters.

The power of the ocean’s tides is the last great untapped energy source on Earth. From sub-sea kites to floating platforms, teams of engineers are racing to perfect the technology to harness the vast flows of water.

If global shipping were a country it would be the sixth largest producer of greenhouse gas emissions. But shipping companies and engineers are creating remarkable new machines to make their industry greener, using a resource that has moved man across the world’s oceans for thousands of years…Wind.

By examining countless Megalodon teeth from around the world, scientists have concluded that "meg" was able to achieve its gargantuan proportions by starting its carnivorous diet early -- in the womb.

Discover the storied histories and witness the breathtaking beauty of the Palmyra, Midway and Rose Atolls in the Pacific Ocean: faraway islands and marine national monuments that remain untouched by civilization. Filmmakers had unprecedented access to the bio-secure zones of these marine monuments.

Whales have long been a profound mystery to us. They live in a world so removed from our own that we can barely imagine their lives. Their environment is different, their senses are different, their relationships are different. How might such almost alien creatures see the world?

What are the special challenges facing marine archaeologists? Experts discuss sites, like the Titanic, and how to protect our heritage.

Some say the oceans, not space, is the final frontier. Are we treating the oceans with the respect and care they deserve?

How can we conserve and protect the oceans and the many lifeforms with the coastal and deep waters?

The US National Parks have some of the most iconic landscapes in the U.S. But there is also an underwater side to explore!

In this prequel to Ancient Earth, travel back in time to the first two of the most powerful extinction periods in history.

The exploration and management of the Coral Triangle may well hold the key to the survival of marine species from all over the world.

Past the white sand beaches and beneath idyllic turquoise water lays one of the fiercest natural habitats in the world.