Clues from other disasters are used to solve how the I-35 bridge in the heart of Minneapolis collapsed without warning at the peak of rush hour traffic.

A state-of-the-art high-speed train catastrophically crashes in Spain.

When a Boeing 777 crashes into San Francisco Airport with no warning, engineers race to figure out what could have caused such a disaster.

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?