In November 1940, the third-longest suspension bridge in the world tore itself apart in a 42-mph wind, twisting like a ribbon before plunging into Puget Sound. The disaster involves economic desperation, a man crawling 500 yards on bleeding knees, a three-legged dog, an insurance scam, and a physics mystery that textbooks still get wrong to this day.

This episode unpacks how a bridge that visibly bounced during construction ever got built, and what really destroyed it. We trace the cost-cutting design decisions, the frantic failed attempts to tame it, the dramatic final collapse, and the science that changed structural engineering forever. It matters because it is a humbling reminder of nature’s power over human hubris.

• How Leon Moisseff’s elastic distribution theory replaced deep stiffening trusses with solid plate girders to halve the cost
• Why the bridge earned the nickname Galloping Gertie and how tie-down cables, stays, and hydraulic buffers all failed to stop it
• Editor Leonard Coatsworth’s crawl to safety and the loss of Tubby the three-legged dog as the span tore apart
• Why the famous collapse footage runs 50% too fast because Elliott filmed at 16 frames per second, not 24
• Why it was aeroelastic flutter, a self-exciting feedback loop, not the textbook resonance explanation that von Karman’s commission debunked