Saw this picture earlier:
Appears to show Tail Rotor Gearbox next to the tail
pylon, so the one theory that some of us had (including myself) of the gearbox departing the aircraft seems to not hold up at this point.
The IVHMU is mounted in the avionics equipment rack in the tailcone, approximately 3 feet aft of the main fuel cells. If the tail pylon is in this condition perhaps the tailcone/aft transition section is in a similar state.
The post crash fire would be the big hurdle the CVR/FDR needed to survive.
Also confirms that was a UH-60L.