PHOTOS: A Journey with Sharks

An underwater voyage redeems sharks, and exposes the darker side of humanity.

Sharks: From Predator to Prey

Sharks
Sharks
Sharks
Sharks
Sharks
Sharks
Sharks
Sharks
Sharks
Sharks
Sharks
The distinctive head of the hammerhead shark remains a mystery. Some scientists think it helps them sense prey and navigate the water.

"There's a lot we can learn from sharks," Stewart said on his Web site. "They are a beautiful example of a creature that's managed to live in balance on earth — and survive." (SHARKWATER Productions)

Slideshows
ABC News on Facebook