A catastrophic fire at a fertilizer plant in 2022 threatens city-wide devastation in Winston-Salem, North Carolina. Experts use the latest science to investigate an outdated, wooden storage facility heavily stocked with volatile, explosive chemicals - ammonium nitrate and propane.

A perfect storm with tragic consequences struck in 1995 as flood waters in Arroyo Pasajero creek ripped away a double-span highway bridge on Interstate 5 in Huron, California. Seven people died as their cars fell into floodwaters. Experts use the latest tech to investigate and reveal bridge scouring with unsupported concrete columns exposed for failure.