Engineer Rob Bell investigates the world's worst engineering disasters. Visiting the scenes of bridge and building collapses, Rob discovers that design flaws and construction errors cost lives, but also teach engineers how to save them. Around the world, as steps have been taken to make the design and construction of bridges and buildings safer, deadly engineering disasters have become rare in the West. But, as our cities grow, our ambition to build bigger and better needs to be kept in check by the necessity for bridges and buildings to be completely safe and remain that way.