After a giant suspension bridge begins to violently rock, it suddenly collapses, marking one of the most iconic engineering disasters of all time; using the latest science, experts reveal what went so catastrophically wrong at the Tacoma Narrows bridge.

When Hurricane Harvey hits Houston, Texas, in 2017, the city is overwhelmed by four feet of rain in four days, causing catastrophic flooding and billions of dollars in damage; experts use cutting-edge tech to discover what went wrong and how it can be fixed.