Originally Posted by C-SAR
I am trying to fit this description with what I saw
To me the trench looks like it's made by the
front of the aircraft going in at a shallow angle but with high energy. The front half of the fuselage is fully destroyed (small pieces), the tough wing box and wings carry on forwards, the rear is destroyed in bigger pieces (as the energy is reduced) until the tail arrives and is left intact.
As has been said - any more has to come from the recorders.