Anthropologist Wade Davis, his daughter, and Robert F. Kennedy, Jr. travel along the spectacular path of the Colorado River as it winds through the Grand Canyon in this stunning IMAX documentary, appreciating the beautiful natural vistas even as the film explores evidence that a drought may be placing the waterway's very existence in jeopardy. How real is the threat? Can people do anything to help? Narrated by Robert Redford. 40 min. Widescreen; Soundtrack: English DTS HD Master Audio.