On May 6, 2010, the Dow Jones dropped nearly 1,000 points in minutes, then recovered almost as fast, the deepest and fastest plunge the U.S. stock market had ever seen. Director Marije Meerman reconstructs that afternoon through interviews with traders, regulators, and programmers who were watching their screens when the numbers went haywire, paired with data visualizations built by design studio Catalogtree that render the crash millisecond by millisecond. The film's real subject is the machinery behind the event: high-frequency trading algorithms executing thousands of orders a second, competing and colliding in microseconds no human eye can follow. Interview subjects describe designing and defending these systems, and their explanations expose how much of modern finance now runs on code trading against other code, with people mostly watching after the fact. The visualizations turn abstract order-flow data into something you can actually watch happen, which is the closest thing here to seeing inside a black box that was built, deliberately, to be opaque.