History's most fatal engineering flaw. On the night of July 17, 1981, just seconds after witnesses heard a sound "like a tree limb cracking," two massive skywalks inside Kansas City's Hyatt Regency hotel tore loose and crashed into a crowded lobby, killing 114 people and injuring more than 200. It's still the deadliest structural collapse in U.S. history, and a horrifying example of one tiny design change leading to a total catastrophe. Today, engineering schools still teach the case as a stark reminder of how the smallest details carry the largest weight.
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