Season 33, Episode 1 Mystery of the Megaflood

First Aired: September 20, 2005

“Mystery of the Megaflood” examines how a bizarre landscape in eastern Washington state known as the Scablands might have been formed. The consensus of opinion: “one of the biggest geological catastrophes ever,” says the narrator . Scientists now think that the Scablands' gorges, dry waterfall beds, scattered boulders and “potholes” were formed some 15,000 years ago when a natural ice dam holding an ancient lake burst. But, as is followed here, that theory took some 80 years to develop.

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  • Premiered: March 3, 1974
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  • Premise: PBS's premier science-documentary series, which has won six Peabody Awards and more than 20 Emmys (four in 2002 alone) since its 1974 debut. `Nova' clearly, and often engagingly, `demystifies' a vast range of science, technology and history topics---past a… (more)

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