Costa Rica's Cocos Island boasts more sharks per cubic yard of
water than perhaps any other place on the planet, including whitetip
reef sharks, 40-foot whale sharks, and hammerheads that school by
the hundreds. On this latest NOVA/PBS Online Adventure, we joined
Howard and Michele Hall, two of the world's leading underwater
filmmakers, as they dove into this shark-infested paradise to shoot an
IMAX large-format film, "Island of the Sharks."