On January 18th, 1978, at 4:19 in the morning, the roof of the Hartford Civic Center in Connecticut collapsed. The entire steel space-frame structure — 1,400 tons of metal — fell straight down into the arena below. Nobody was killed. Not because the engineers had planned for this. But because the collapse happened four hours after the last fan left the building. The night before, 5,000 people had been sitting directly underneath that roof watching a basketball game. Here is what makes this story different from every other engineering disaster you've heard about: the roof had been showing signs of failure for over two years. Multiple engineers had noticed it. Inspectors had flagged it. And every single warning was ignored. This is the story of the Hartford Civic Center collapse — and the six other major stadiums and arenas around the world that failed the same way, for the same reason, and that nobody has ever connected into a single investigation. Until now.