After weeks of marching, a herd of elephants finally reaches its destination. Unlike the dry, desolate Kalahari Desert, this part of Africa resembles a lush water world.

Underwater cameras capture an amazing scene that most people have never seen before. The elephants trod out into the water for a refreshing swim! "I didn't know elephants could swim underwater," Oprah says. "I've never seen that before. It's just incredible."

How did they get the incredible shot? Jonny says he was very fortunate to work with a lot of brave camera operators. During the five-year shoot, these men and women swam alongside many dangerous mammals, including elephants, hippos, polar bears and whales.