Shark Expedition: Seeking Giant Sharks

What's got 3,000 tiny teeth and a 5-foot-wide mouth? The whale shark - or "the friendliest shark in the sea," according to diver and photographer Jeff Rotman. But friendly or not, these school-bus-size fish can be intimidating...as Jeff finds out! Join him on his quest to reveal the quiet mysteries of filter feeders such as the whale shark and basking sharks, and why these giant creatures need our help.