NATURE | Shark Mountain | Preview | PBS

Underwater filmmakers Howard and Michele Hall have spent 25 years diving and documenting the most remote and beautiful underwater locations, always learning something new about the fantastic creatures that live there. This film follows them to Cocos Island, an underwater kingdom in the Pacific dominated by an extraordinary number of sharks. Tune in Sunday, July 29th at 8 p.m. (ET) on PBS (check local listings.)

For more information, visit http://www.pbs.org/nature