Watch Niagara Falls - Raging Rapids

We probe the secrets of Niagara Falls. From helicopter and speedboat, at high-tech labs and at rope's end, we join earth scientists as they struggle to piece together the epic life story of North America's most celebrated natural wonder. We experience the Falls that daredevils and stunters could never tame -- the Niagara that is a vertical battleground between water & rock.

Niagara Falls - Raging Rapids is a 1999 documentary with a runtime of 55 hours.