In Minneapolis, a major freeway bridge suddenly collapses in the middle of rush hour.

A massive sinkhole swallows millions of dollars of legendary automobiles at the National Corvette Museum in Kentucky; expert geologists investigate and reveal how an enormous cave system could remain undetected and poised for catastrophic destruction.

A devastating rail disaster outside a small North Dakota town results in cargo erupting in massive explosions; experts use the latest science to investigate and uncover an engineering flaw poised for catastrophic failure.

A series of violent explosions rips through a major Texas oil refinery, causing a fatal disaster and devastation on a terrifying scale; experts use the latest science to investigate and uncover what triggered a catastrophic malfunction.