With all the drifting snow, you would need an army of men with metal detectors to find most of the bits. If it was not a Bird-Strike, or a Drone, then maybe even a Meteorite-Strike is possible.
Although there is no signs of damage to the drive-shaft, the GP7200 has a 4:1 gearbox, ( and the GP8000 has a 3:1 ratio gearbox.) which could have played some part in the break up.
Last edited by scifi; 6th Oct 2017 at 22:56.