This episode examines four aviation disasters to illustrate how minor errors cascade into catastrophe. It covers Helios Flight 522’s depressurization, the IFO-21 crash caused by bureaucratic negligence, the DC-10 cargo door design flaws, and the Air India 182 bombing. The hosts discuss the "Swiss cheese model" of failure and how safety regulations are often written in blood, emphasizing that modern aviation safety relies on lessons learned from past tragedies.