Seconded, Normal Accidents is one of the best books I've ever read. In addition to the maritime accidents, there are chapters on nuclear plants, chemical plants, and dams. It is a great discussion of how modern industrial accidents rarely have a single cause but instead are cascade failures of systems whose complexity has evolved beyond what we can handle, and presaged many of the messes we've got into with hyper-scale software projects before those ever existed.

Is there a "sequel" to Normal Accidents about software? Because I'd buy that in a heartbeat.