Part 4/10:
As the plane ascended to its cruising altitude of 34,000 feet, the passengers’ oxygen masks deployed. The flight crew received no alarms indicating a loss of cabin pressure, yet they failed to recognize the gravity of the situation. Attempts from air traffic control to communicate with Flight 522 were fruitless. By this point, the aircraft was on autopilot, proceeding on its flight path without any sign of distress.