Will Smith confronts his fear of nature on powerful white-water rapids in Iceland. 

Will Smith discovers hidden worlds of fast and slow in the Earth's oldest desert.

On the trail of tiger sharks in the Pacific, Will explores the power of smell.

Will Smith crosses the Serengeti to catch one of the greatest migrations on Earth.

Will Smith descends 3,300 feet down into the ocean to explore a hidden world of color in the dark.

On a remote island in the Pacific, Will Smith descends into the heart of an active volcano to investigate sounds beyond human hearing. Will discovers that everything on our planet creates its own unique sound — even if we can't always hear it.