The story

"Planet in Peril: Battle Lines" traveled to a place off the coast of South Africa known as "shark alley," one of the best places in the world to see great white sharks.

Shark tourism has become big business, bringing in more than $30 million every year to South Africa.

The experience is a major draw for tourists, but it's controversial. Local surfers and swimmers say it is changing shark behavior and may be causing more attacks. Anderson Cooper swam with these great white sharks -- without a cage -- as part of his report for "Planet in Peril: Battle Lines." Read full article »