Engineering is an essential part of the modern world -- we wouldn't have things like roads without it -- but it can cause dangerous situations when things go wrong. This series takes a look at what happened to cause some of history's most notorious engineering accidents. From a stage collapse that killed seven people to an airplane that split in half in midair, the hourlong show goes inside each disaster to uncover how it happened. Expert and eyewitness interviews are combined with on-site footage and state-of-the-art graphics to examine each catastrophe.