A Boeing 777 crash-lands into the San Francisco Airport with no warning, leaving everyone baffled; as engineers race to figure out what happened, they turn to other disasters to unveil the complicated relationship between humans and machines.

Italy suffers one of the worst engineering disasters when the Morandi bridge suddenly collapses; examining what failures of a Brazilian dam, a Manilla high rise, and a building in Jerusalem reveal about the collapse.

37,000-feet over Iowa, a DC-10 aeroplane explodes mid-flight and the quick-thinking pilot crash-lands, saving 184 passengers; the connection between the infamous Concorde crash, a fatal British skyscraper fire, and a North Dakota train derailment.

In busy downtown New Orleans, a high-rise hotel under construction unexpectedly comes crashing to the ground; as the dust settles, the question on everyone's lips is why?