Endangered sea turtles are making a comeback thanks to the T.E.D. - the Turtle Excluder Device.

The ocean is the source of all life. With every drop you drink and every breath you take, you are connected to the ocean no matter where on Earth you live. Oceans generate 70% of the oxygen in the air, and absorb much of its carbon dioxide. They drive the climate, the weather and the chemistry of the planet. Our oceans occupy over 2/3 of the planets surface and provide a home for most of the creatures on Earth. Unfortunately, our knowledge of the ocean is far outstripped by our impact on it. Although time is running out, it isn't too late to expand on our understanding of the worlds oceans, and to use that knowledge to effect positive change.

The Sub Marine Explorer was built in New York by Julius Kroehl in the mid-1800s. Kroehl brought his invention to Panama's pearl islands for pearl fishing, but the craft was technically flawed, giving its occupants the "bends" or decompression sickness. It was abandoned near shore in 1865 and was rediscovered in 2001 by archaeologist Dr. James Delgado. In 2008, the Waitt Institute partnered with Dr. Delgado, the Institute of Nautical Archaeology and the Instituto Nacional de Cultura de Panama to complete documentation of the sub before the tides erode its hull into the sea.

The laboratory for the study of the origins of life. See the amazing creatures Darwin first saw in 1835 -- giant tortoises, sea turtles, flightless cormorants, iguanas and penguins -- and venture deep in the ocean to hot water vents connected to the core of the earth.

Great White Sharks: the most majestic and most misunderstood predator on the face of the earth. A recurring population migrates each fall to Isla Guadalupe to feed on seals, sea lions, and tuna. Known as "apex' predators, these sharks are absolutely critical in maintaining a balanced marine ecosystem, but their future is threatened as their numbers decline due to commercial fishing and poaching.

www.silvertipworld.com - In the freezing waters of Svalbard, beyond 79 degrees north, an unusual predator is feeding on the abundant plankton. This is a type of ctenophore, or comb jelly - the name derives from the hair-like structures running down their length, which are used for movement. This jelly has swallowed an animal called a larvacean, a type of plankton that exists in huge numbers in these waters. This particular meal tries to escape - watch to see what happens!

Black Grouper Spawning Aggregation in Bermuda.

Ethereal, otherwordly, translucent sea angels seem to hover through the cold waters of the Arctic Ocean. Hard to believe they're related to snails!

The bluefin tuna is a hunter swifter than a dolphin and as bold as a great white shark. But little is known of their world. Radio tracking reveals that tuna travel thousands of miles across the ocean, gobbling up smaller fish along the way. Wild Chronicles joins the feeding frenzy as a group bluefin tuna feed on a giant baitball of mackerel.

The waters around Bermuda are warmed by the Gulf Stream, and host the Sargasso Sea--a liquid jungle of creatures such as loggerhead turtles, fish, sea hares, crabs, and seahorses that exists in floating forests of golden brown sargassum seaweed on the surface of the sea. Within Bermuda's deep waters, explorers William Beebe and Otis Barton discovered bioluminescent sea creatures reminiscent of comets, suns and stars. In between the surface and the deep sea, humpback whales and jellies drift along with the ocean currents.

Wild Chronicles plunges into the deep waters of Chatham Strait where Alaska's humpback whales perform one of the most breathtaking displays of cooperative feeding in nature. With a hankering for herring, the whales blow "bubblenets" to help herd their prey towards the surface. Using a tiny camera outfitted with a myriad of sensors, Crittercam reveals a whale's-eye view of hunting techniques and mealtime secrets.

The sargassum fish can camouflage itself to look exactly like a sargassum plant and ambush unsuspecting prey with deadly ease.

Now here's a question: How can a creature like the bowhead whale, which has no teeth, get to be 60 feet long and weigh up to 60 tons? Found out!

Some people think of sharks as blood thirsty man eaters but as you will see in this video they can be very docile if you scratch them in just the right spot. Some might even call what this diving guide does shark hypnotism.

Giant orcas are turning up missing along the California Coast. Wild Chronicles sets out to find the culprit before it's too late.

One of science's greatest riddles is finally solved when Harvard dentist and National Geographic grantee Dr. Martin Nweeia discovers the function of the narwhal whale's unicorn-like tusk. Wild Chronicles follows this dental detective to the Arctic where the extraordinary powers of this mysterious tool of nature are revealed.

A thousand miles off the coast of Portugal, the team from Crittercam is using revolutionary camera technology to investigate the deep water tendencies of sperm whales. Join Wild Chronicles on this journey beneath the waves where scientists are making new discoveries about the diving behavior and vocalizations of these underwater behemoths.

Footage from the Bermuda Tiger Shark Project

Wild Chronicles travels to the Greek island of Santorini, the ancient home of a thriving maritime community that vanished following the second-largest volcano eruption in human history. National Geographic Explorer-in-Residence Robert Ballard and his team dive into the Aegean Sea to investigate the islands surrounding volcano system where active hydrothermal vents may help predict the next big eruption.

Petty Officers Daniel Jackson and Phillip Kahl talk about their job maintaining weapons systems aboard the 378-foot High Endurance Cutter Boutwell on their deployment to the Far East. Properly firing weapon systems are necessary equipment for conducting a variety of the Coast Guard's missions. (Coast Guard video by Petty Officer Jonathan R. Cilley)

One of the strangest ecosystems on earth lies deep under the ocean.

Freeport, Gand Bahama is known for the pods of wild dolphin that frolic in it's waters. It is also known for UNEXSO the Underwater Explorers Society which operates one of the largest one of the largest interactive captive dolphin programs where tourists can get in the water and swim with trained captive dolphin and experience these wonderful gentle creatures in their own element. What is truly unique is that these dolphin are taken out into the open ocean on a daily basis to play with divers and snorkelers but never swim away to escape captivity. It is a testament to UNEXSO and the wonderful care they receive. This video was shot by George Monteiro of Sea-Cam, Inc. on the new Red Digital Cinema camera. The model/actress the lovely Muriel Hurtado

Wild Chronicles heads to the Florida Keys where one of the fiercest predators in the sea shares shallow waters with beachgoers. Tenacious and sometimes aggressive, bull sharks will eat just about anything — and they are known to attack humans. In an effort to understand more about their feeding habits, researchers call on the innovative technology of Crittercam® to get an underwater look at bull shark behavior.

With a body like few others on earth, the octopus reveals itself as truly extraordinary. Basically a brain attached to eight arms, the octopus may be the most intelligent of all invertebrates. Marvel at the amazing feats of this boneless creature as Wild Chronicles examines how the octopus has made a place for itself in nearly every corner of the world's oceans.

What possesses a girl to open up a box of dead fish fish on the ocean floor in the midst of a hungry school of sharks? Find out as this former olympic swimming contender befriends some of the fiercest predators in the sea.

The Coral Triangle is a fragile treasure between the Pacific and Indian Oceans. Encompassing over one and a half billion acres, it is equal in size to half of the United States. Its waters are home to 3,000 species of fish, and more than 600 kinds of coral.

Petty Officer Curtis Munsey, stationed on the 378-foot High Endurance Cutter Boutwell, talks about emergency procedures and training used on the cutter while on their deployment to the Far East in 2007. It is important for all members of the ship to know first aid since the ship could be days from hospital in port. Boutwell was deployed as the U.S. Coast Guard representative to the North Pacific Coast Guard Forum, a six-nation body created to combat international illegal, unregulated and unreported (IUU) fishing on the Northern Pacific Ocean. (Coast Guard video by Petty Officer Jonathan R. Cilley)

Sunk as an artificial reef by local dive operator Stuart Cove, this magnificent wreck site has become home to a beautiful array of hard and soft corals, sponges, tunicates and schooling fish. A popular site with divers, it never fails to provide the careful observer unique underwater experiences.

A tropical setting in the Caribbean is where sperm and eggs meet to form these coral reefs.

Just off the coast of Monterey Bay is an undersea canyon that ranks among the largest in the world. It supports life from tiny krill to baleen whales who feed on them. The bay is also home to the Humboldt squid, mola mola, seals, orcas -- and giant kelp forests full of sea slugs, sea urchins, octopus, melibe, and sea otters. At the curve of the bay is the Elkhorn Slough, a seasonal estuary rich in birds and marine life. Cannery Row used to be located here at a time when sardines, salmon and halibut were historically overfished, but the waters around Monterey Bay are now a protected marine sanctuary.

Join Wild Chronicles and National Geographic's Crittercam® team in Cape Washington as they deploy special cameras to reveal how emperor penguins travel vast distances to feed -- and then run a dangerous gauntlet back to their chicks. It takes well-honed skills to survive Antarctica's frigid waters, jagged ice fields and hungry leopard seals.

This video shows five new deepwater corals found in the Papahanaumokuakea Marine National Monument, Northwestern Hawaiian Islands in 2007.

Wild Chronicles travels to Cuba where two biologists, on a search for new species, explore an extraordinary saltwater cave ecosystem in the middle of the jungle. Cave diving is always a dangerous endeavor, but floating down through the fresh and salt water layers of the cave leads the researchers to species like the blind cave fish, which are perfectly adapted to total darkness and life below Earth's surface.

Join Wild Chronicles on a journey to the Arctic where wildlife filmmaker meets bowhead whale — one of nature's most long-lived mammals. Not much is known about this mysterious giant, but with a little help from National Geographic's Crittercam® the filmmaker gets a breathtaking glimpse into the whale's secret world. The revealing footage has helped researchers discover how these whales can survive centuries in their freezing habitat.

www.silvertipworld.com - St. Kilda is the most remote point of the British Isles and this island endures heavy weather from the Atlantic year round. Kelp gardens provide shelter for a variety of creatures, including grey seals, nudibranchs, anenomes and urchins. Follow divers as they explore some of the life to be found along these storm-washed shores.

Rare footage shot aboard the National Geographic Endeavour while in Antarctica, shows a family of Type B Orcas training a juvenile the technique of "wave hunting".

Off the coast of Monterey Bay, California, the arena is set killer whales and gray whales are set for an annual, epic battle. While gray whales are 30-ton powerhouses, they face a fierce predator in killer whales. Join Wild Chronicles to see who wins this struggle for survival beneath the turbulent waves.

National Geographic Endeavour Expedtion team comes to the aid of a fur seal, removing rope debris from his neck.

An 18' Great White Shark visits the Northshore of Oahu. Jimmy Hall swims with it and films it.

For two million years, the world's largest sea lions have survived along Alaska's rocky coastline, but now the population is declining at an alarming rate. Wild Chronicles joins a team of scientists using an innovative camera to investigate theories about the Steller sea lions' mysterious disappearance, and uncovers clues that could save the species.

The coldest, windiest place on Earth, holds 60 percent of the fresh water on the planet. It is home to the enormous elephant seal and the ferocious leopard seal. New expeditions to the Weddell Sea produced more than 700 new species, including giant carnivorous sponges.

Racing against time, researchers and volunteers work tirelessly to save a group of beached pilot whales in Florida. Every year thousands of whales beach themselves in an act that is as mysterious as it is tragic. A team of scientists is determined to solve this grand mystery of the sea before its too late.

A research team led by Woods Hole Oceanographic Institution (WHOI) has uncovered evidence of explosive volcanic eruptions on the Arctic Ocean seafloor almost 2.5 miles deep. Scientists did not think volcanoes submerged under such intense water pressure were capable of such violent eruptions. Researchers found jagged, glassy fragments of rock (called pyroclastic deposits) spread out over a 4-square-mile (10-square-kilometer) area around a series of small volcanic craters on the Gakkel Ridge, a remote and mostly unexplored section of the mid-ocean ridge, the volcanic undersea mountain chain that wraps around the globe. These are the first pyroclastic deposits we've ever found in such deep water, at oppressive pressures that inhibit the formation of steam, and many people thought this was not possible, said WHOI geophysicist Rob Reves-Sohn, chief scientist of an expedition to the Gakkel Ridge in July 2007. This means that a tremendous blast of carbon dioxide was released into the water column during the explosive eruption.

Sailing Antarctica is not the average summer vacation. Wild Chronicles meets a family of explorers and naturalists who sail Antarctica's frigid waters in their tiny yacht to monitor chinstrap penguins. Days are long and quarters are tight, but Antarctica's beauty is worth the ride.

At the Peninsula Valdez, a pod of orcas undertakes a daring dining ritual. They risk beaching themselves while on the hunt for seals and sea lions. The waters off the tip of South America are also home to the Chilean seabass, the legendary albatross, and the charismatic Magellanic penguin.

Join Wild Chronicles aboard the National Geographic Endeavor on an expedition to Antarctica to count chinstrap, adelie, and gentoo penguin populations one bird at a time. Natural dangers abound and survival is not easy in this frozen land. And now, new research suggests rising temperatures and climate change are providing additional threats to these creatures.

You might just miss them if you're not looking closely, but when they get together, a variety of jelly plankton make for one of the most luminous displays in the ocean.

New Edit of Tiger Shark video

Seven and One-half Fathom Reef is a submerged bank off the coast of South Texas in 10-20 m of water. It is one of several "snapper banks", and a true treasure in the Gulf of Mexico.