AllMovie

Not so far back, an iconoclastic geologist began theorizing - in the face of hundreds of skeptics - that two million years ago, a titanic flood carved out the majority of present day Montana, Washington, Oregon and Idaho. His contemporaries turned their noses up and scoffed - until evidence surfaced to corroborate the scientist's theory: traces of an ancient ice dam alongside a Montana valley, which held in millions of gallons of water, until the dam itself melted - sending untold torrents across the Pacific Northwest and decimating everything in its path. In NOVA: Mystery of The Megaflood, the acclaimed and multi-award winning WGBH series NOVA uses computer generated graphics to carry viewers into this ancient realm and study the enigmatic natural catastrophe that defined and sculpted broad vistas of our country.