It is man's greatest fear-being eaten alive. And diving down here in the depths, the streamlined shark holds every advantage. How close do you want to get?Acclaimed underwater photographer David Doubilet takes you deep into their dangerous realm. Yet he points out that it is we who are the killers! Our fear and ignorance puts this diverse family of fish in great danger. Let David teach you about sharks' complex nature, and about how you can help to save the shark.