Modern technology allows us to build incredible structures like giant tankers, mammoth skyscrapers and colossal bridges. But, with enormous size comes enormous risk, and when big things go wrong, they go really wrong. The HISTORY Channel's new series examines the catastrophic result of some of the world's worst engineering disasters caught on tape. Each episode breaks down shocking footage from collapses and collisions to reveal the shocking answers to the question, what happened? Woven together through innovative graphics, eyewitness accounts and expert knowledge, the series unravels the mystery behind these destructive moments and their lasting worldwide impact.