99% Invisible
Structural Integrity
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Show notes
When the (0:43) 601 Lexington / Citicorp Tower was completed in 1977, the 59-story skyscraper had a potentially fatal flaw that could have caused it to collapse in a severe storm. Once engineers realized the danger, they launched a secret emergency repair operation, welding through the night while evacuation plans and weather monitoring were quietly put in place.
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