Originally Posted by Stabilo31
The tail section which has been recovered is weighing at least several hundreds kilograms and probably more than a ton. Once this kind of piece has sunk (less than 30m deph) in the mud and due to the shape of this part (asperity), I doubt that it could have been dragged along the bottom even with a 6kts stream.
Weight is not a problem. Thanks god we have buoyancy, so multi-tons objects can float. (in water: immersed 1 cubic meter = 1000kg buoyancy)
In my opinion in this particular case, vertical stabilizer worked as kind of a parachute for this part of fuselage (because it contained some empty spaces or foam-filled) making the resultant force less. Not enough to float but sufficient to substantially reduce speed of decent. Add strong currents and mystery is solved.