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Stream the full NOVA: Mystery of the Megavolcano movie online for free in crystal-clear HD quality. No downloads required—just press play and enjoy the action, complete with English subtitles for an enhanced viewing experience.

Scientists confront on an astounding possibility: that a single ancient cataclysmic volcanic eruption 75,000 years ago blasted ash and rock across an entire continent, spewing so much sulfuric acid into the atmosphere that Earth was plunged into a global