The Helios Airlines Flight 522 crash in 2005 that killed all 121 on board reads like the script of a horror movie.
The pilots forgot to hit the pressurisation seal switch during the takeoff checks, resulting in the air leaking out as the aircraft climbed.
Everybody on board (including the pilots) blacked out except for a male flight attendant who used a spare oxygen cylinder.
The plane continued on autopilot and he found himself alone in a plane full of dead people.
It eventually crashed when the fuel ran out.
https://en.wikipedia.org/wiki/Helios_Airways_Flight_522
The pilots forgot to hit the pressurisation seal switch during the takeoff checks, resulting in the air leaking out as the aircraft climbed.
Everybody on board (including the pilots) blacked out except for a male flight attendant who used a spare oxygen cylinder.
The plane continued on autopilot and he found himself alone in a plane full of dead people.
It eventually crashed when the fuel ran out.
https://en.wikipedia.org/wiki/Helios_Airways_Flight_522
