A Magical Underwater Experience-- Husband and wife underwater filmmakers Howard and Michele Hall risked the dangers of the ocean, and explored its mysteries. In this very special episode of Nature, the Halls take you along on the expedition of a lifetime to Coco's Island.-- World famous for its sharks, this tiny outpost 200 miles into the Pacific off the coast of Central America was once a haven for pirates. But the Halls are seeking their own brand of beautiful wilderness were thousands of sharks and fantastic creatures gather in the currents beyond the reach of humans.