March 28, 1979. If you lived in Pennsylvania at the time, you undoubtedly know the significance of that date. If that’s before your time, you’ve likely learned of it in history class. As Pennsylvanians went to bed the night before, little did they know that one of the worst disasters in U.S. history was only hours away. Here’s a brief summary of what turned out to be a very complex accident.

Do you have memories of the accident at Three Mile Island, one of the worst disasters in U.S. history, and its aftermath? Share below! Then, click here to read more about Donora, a small PA town with a deadly history.

OnlyInYourState may earn compensation through affiliate links in this article.