National Geographic The Sharks (1982)
Filmmakers Ron and Valerie Taylor go beneath the surface to tackle the fear and loathing of the ultimate predator -- the shark. This documentary bares its teeth to show the viewer the full spectrum of these carnivores, from their eating habits to their stalking maneuvers. The tape includes stunning actual footage of divers in cages and petting "sleeping" tiger sharks. While the video dispels the overstated body counts concerning shark attacks, it leaves no doubt that the threat from down below is a real one.