Eli discusses his incredible experience diving with 80 sharks swimming around him.

Eli spends his morning with the shy blacktip sharks as he discusses his plans to go back to see the wall of sharks.

A camera called the "Shark Eye 2" will be used to track the behavior of a "grander" mako shark (over 1,000 pouds)...if the team can catch one. From Shark Week 2016's "Return of the Monster Mako."

After not seeing any last year, Eli prepares for a deep dive to see the strong silver tip sharks.

Before leaving Tahiti, Eli recounts his adventures and plans for next year's dives.

A dive team leaves the shark cage to get measurements of giant monster makos at night. How close is too close? From Shark Week 2016's "Return of the Monster Mako."

Each summer the Gulf Stream pushes north into the waters of southern New England, bringing with it 30 species of shark. Greg Skomal and Joe Romeiro study makos, great whites and porbeagles that can out-swim, out-think, and out-compete all the others.

Researchers are shocked to discover an absence of great white sharks in a prime location for shark migration, underscoring the need for protection. From Shark Week 2016's "Blue Serengeti."

A team of explorers float in a one-of-a-kind shark cage, 500 miles into the Gulf of Mexico. Acting as human lures in the open ocean will they encounter its deadliest shark?

From active to extinct, and at every stage in between, volcanoes hold a strong attraction for sharks of all kinds. Across the world, sharks congregate and concentrate around volcanoes and volcanic islands.

Experts unravel the mystery behind one of the sea's strangest creatures, the sawfish, from its evolutionary links to sharks and rays, to its key role in the marine ecosystem.

Michael Phelps enrolls in shark school to learn the truth about sharks.

In Brazil, Dr. Hazin has successfully reduced the number of shark encounters by simply catching and moving sharks out to the open sea. What’s his secret? And can this solution work in Australia, where encounters are a problem?

A shark's unique night vision makes it a pro at picking off prey under the moon's low light.

Shark Week is back. Are you ready?

Hammerhead sharks are on the endangered species list because they're being overfished for their fins. One of the best ways to protect such endangered species is to get them listed at CITES. James Williams reports.