National Geographic Sharks

National Geographic goes on a deep-sea expedition with world-renowned shark experts as they tag a 12-foot great white they call Nicole. Driven by overpowering natural instincts, Nicole navigates icy cold waters, dives to unfathomable depths, battles hunger and fatigue, outsmarts some of the ocean's most lethal inhabitants and ultimately travels 6,000 nautical miles in 99 days, the fastest trans-oceanic migration recorded for any fish.

Cocos Island, appears as a tiny dot on a map in the Pacific Ocean more than 300 miles off the coast of Costa Rica, and is home to one of the greatest concentrations of predators on the planet. Dive into this carnivorous crowd with marine ecologist Enric Sala and an international team of explorers and scientists as they search for clues to explain why so many predators congregate here and why life largely disappears right outside its waters.

While on a study in Sharkville, a shark-infested area off Africa's coast, shark expert Ryan Johnson made the discovery of a lifetime, great whites hunting at night. For the first time on film, witness this remarkable sight.

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 and hear firsthand accounts of people who survived harrowing encounters. National Geographic demystifies the true motives and power behind their behavior.

Reptile expert Brady Barr plunges to frigid ocean depths to get close up to one of the world's most mysterious, deep-sea sharks-the giant sixgill shark. These prehistoric creatures have remained elusive despite their size, but while filming some of the largest congregations of sharks ever seen, Barr and his team make an amazing observation and capture unique shark behavior on film.

Hidden beneath the surface of the sea is a phenomenon we know almost nothing about. On land, scientists have long studied the great animal migrations, but in the ocean some of the most spectacular events go almost unnoticed. Now, with an international team of scientists, National Geographic examines the movements of hammerhead sharks. How do they navigate? Do they possess an internal compass? What prompts them to seek out distant destinations? In a world threatened by overfishing and declining marine populations, understanding their behavior may be the key to ensuring hammerhead survival.