Download video: How Manhattan escaped tragedy

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The Citygroup Center in Manhattan, New York, formerly known as the Citycorp Center,
had a fatal flaw which could have led to a major disaster, killing tens of thousands of people...

In 1978, the skyscraper's chief structural engineer, William LeMessurier, discovered a potentially fatal flaw in the building's design: the skyscraper's bolted joints were too weak to withstand 70-mile-per-hour wind gusts.


part II ---
part III --

(c) BBC

This video comes in 3 parts of about 10 minutes each.