Oceanic 815 had mid-air break-up due to electromagnetic pull. This was triggered by Desmond's failure to push the button on 22 September, 2004, the same day as the crash. This resulted in a System Failure that involved an intense magnetic field from behind the concrete wall in the Swan. By the time Desmond was able to enter the numbers, the airframe of Oceanic 815 had undergone such violent stress that it disintegrated.