Marine biologist Tom Hird's search for the world's largest great white shark is featured during Discovery's "Shark Week," hosted by John Cena. They're looking for a 6,000-pound shark. Also on "Shark Week," prepare for an alien invasion. Wildlife biologist Forrest Galante searched for a rarely seen and little-known species of sharks. Cameras captured a rare velvet dogfish shark giving birth. Inside Edition's Jim Moret has more.
