TIL about Helios Flight 522. An engineer failed to set the pressurization system back to auto from manual, causing most (except 2 flight attendants) to lose consciousness. The auto-pilot reached Greece and stayed in a holding pattern until they ran out of fuel and crashed, killing all 121 onboard.

https://en.wikipedia.org/wiki/Helios_Airways_Flight_522
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1genonj/til_about_helios_flight_522_an_engineer_failed_to/