The volcanic winter of 536 was the most severe and protracted episode of climatic cooling in the Northern Hemisphere in the last 2,000 years. Investigating through the lens of dendrochronology and historical accounts, this documentary explores how a mysterious dimming of the sun, bloodcolored rain, and dust clouds plunged civilizations into two years of darkness, followed by famine, plague, and societal collapse. Through the groundbreaking research of historians like David Keys and scientist Mike Bailey, discover how tree rings from around the world offer crucial insights into this pivotal moment that forever altered the course of human history.

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