Originally Posted by
Stabilo31
What do you call a "light piece of aircraft"? 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.
Aircraft are made to 'fly' their structures are not solid and many are deliberately honeycombed. Some parts of the structure like engines are denser. If you drop something into water that is moving fast then it will be carried along dependent on its density and aspect ratio. The engines if disconnected are likely to fall to the bottom. Lightweight aluminum and composite structures are far less dense with a large surface area to weight ratio will be carried a long way. They are MADE to be carried a long way in the air after all. Aerodynamic forces are strong on flat panels hydrodynamic forces are hugely stronger.