A shark closes in on a boat.Discover Channel - Tuesday, July, 28, 2009, 9:28 PM

Just some of the equipment needed to study sharks in their natural habitat.Discover Channel - Tuesday, July, 28, 2009, 9:28 PM

A great white shark sinks his teeth into a decoy off southern Australia.Discover Channel/Caterina Gennaro - Tuesday, July, 28, 2009, 9:28 PM

The fearsome great white patrols the shores off more than 50 percent of the world's inhabited coastlines.Dicovery Channel - Tuesday, July, 28, 2009, 9:28 PM

This great white, off Guadalupe Island, Mexico, has a bloody nose.Discover Channel/Caterina Gennaro - Tuesday, July, 28, 2009, 9:28 PM

Ex-Marine Charles Ingram prepares to dive on "Great White Appetite."Discover Channel/Arom Starr-Paul - Tuesday, July, 28, 2009, 9:28 PM