World's Biggest Bull Shark?

Shark expert Neil Hammerschlag and a crew of researchers search for an elusive hammerhead shark.

Ocean Predators Immerse yourself deep into the ocean in search of the most dangerous predators in our seas. Unveil the mysteries of these fascinating and skilled hunters. Razor-sharp teeth and lightning-fast reactions rule in this unforgiving environment. Are you ready to discover the facts behind the myths and legends about sharks, barracudas and moray eels? Shot in 3D, this documentary introduces you to the Kings of the Sea in an unprecedented way..

Nearly 40 shark species live in the warm waters of Hawaii's volcanic islands, including white tip reef sharks, Galapagos sharks and tiger sharks.

Turtle Odyssey explores the unique lifecycle of an Australian green sea turtle named Bunji and her incredible journey across the open ocean. The film follows Bunji the green sea turtle from a hatchling into adulthood as she swims thousands of miles, meets incredible creatures and has some really wild encounters.

In April 2013, a fishing vessel was attacked off the coast of South Africa, killing all on board. A TV crew documented Marine Biologist Collin Drake as he worked to determine the predator responsible. His discovery is presented in this shocking footage.

An epic journey through the oceanic kingdom of the Atlantic Salmon in an attempt to unravel the mystery of their life at sea. Salmon are plummeting to critical levels. The cause is mortality at sea. For the 1st time, using the latest DNA technology, scientists are tracking the salmon from the rivers into the vast North Atlantic and back again, in hopes of finding an answer before it's too late.

OCEAN RAMSEY attributes her unparalleled connection with sharks to over a decade of research, but many are convinced it is something more... The media has dubbed her "The Shark Whisperer". Battling a looming extinction, Ocean and her team of marine biologists will travel the globe for 12 months, conducting research and expanding their conservation efforts. From renowned scientists and PHDs, to elite athletes and celebrities, "The Shark Whisperer" will lead humans from all walks of life out of their element and into the deep... free-diving with some of the worlds most dangerous sharks. Her goal: To give the world the opportunity to see sharks the way she does.

An underwater exploration beneath kelp forests in the Pacific Ocean off the coast of Southern California. The film captures the birth of a shark, squids mating, a lobster molting, a fish protecting its nest from an octopus and a sea urchin, and the sea bed covered with brittle stars.

A journey into the land of sharks. The old myth of swimming killing machines is put against the true nature of those rather peaceful hunters, whose evolution ended in biological perfection millions of years ago. We accompany expeditions of Dr. Eugenie Clark and Rodney Fox, who have studied sharks since the 1950's.

"Kon-Tiki" was the name of a wooden raft used by six Scandinavian scientists, led by Thor Heyerdahl, to make a 101-day journey from South America to the Polynesian Islands. The purpose of the expedition was to prove Heyerdal's theory that the Polynesian Islands were populated from the east- specifically Peru- rather than from the west (Asia) as had been the theory for hundreds of years. Heyerdahl made a study of the winds and tides in the Pacific, and by simulating conditions as closely as possible to those he theorized the Peruvians encountered, set out on the voyage.

See the world's first MRI scan of a great white shark as Ultimate Shark reveals the extreme engineering and predatory abilities of one of nature's most near perfect predators. Hear firsthand accounts of people who survived harrowing encounters, including a surfer who was bitten on the arm and leg, towed by the surfboard ankle strap and miraculously escaped only with minor injuries. National Geographic demystifies the true motives and power behind their behavior.