File this under scary. Today, Reuters cited sources giving an eerie explanation for the crash of a Helios airliner last month in Greece: Confused pilots. The tragedy had been confusing from the start, because the flight crew and most of the passengers appeared to be unconscious when the Boeing 737 ran out of fuel and crashed. De-pressurization was a leading suspected cause of the crash.
Reuters, citing a story in International Herald Tribune, claims that a maintenance crew left a pressurization control knob undone. The pilots missed this and misunderstood a pressurization warning alarm. Apparently, the cabin never pressurized at all.