(...) An intentional depressurization would have been an obvious way—and probably the only way—to subdue a potentially unruly cabin in an airplane that was going to remain in flight for hours to come. In the cabin, the effect would have gone unnoticed but for the sudden appearance of the drop-down oxygen masks and perhaps the cabin crew’s use of the few portable units of similar design. None of those cabin masks was intended for more than about 15 minutes of use during emergency descents to altitudes below 13,000 feet; they would have been of no value at all cruising at 40,000 feet. The cabin occupants would have become incapacitated within a couple of minutes, lost consciousness, and gently died without any choking or gasping for air. The scene would have been dimly lit by the emergency lights, with the dead belted into their seats, their faces nestled in the worthless oxygen masks dangling on tubes from the ceiling. (...) The cockpit, by contrast, was equipped with four pressurized-oxygen masks linked to hours of supply. Whoever depressurized the airplane would have simply had to slap one on. (...) All through the Strait of Malacca, the airplane continued to be hand-flown. It is presumed that everyone in the cabin was dead by this point. At 2:22 a.m., the Malaysian air-force radar picked up the last blip. The airplane was 230 miles northwest of Penang, heading northwest into the Andaman Sea and flying fast. (...) Three minutes later, at 2:25, the airplane’s satellite box suddenly returned to life. It is likely that this occurred when the full electrical system was brought back up, and that the airplane was repressurized at the same time. (...)