[fatman6502002]

I saw a post several months ago from a pilot that said in this particular it is quite possible that no debris would be found, if the pilot put the plane on auto pilot and killed himself that eventually when the fuel ran out the autopilot would keep the plane flying as a glider just above stall speed, so he said it is possible that the plane, rather than making a high speed plunge into the ocean might have been glided to a relatively soft landing on the water and then it just sunk. In any case all possibilities have to be considered.

[mazda77]

Jets don’t glide. When the engines stop, they have the glide path like a brick.

If he set it to just above stall speed, the changing weather conditions and wind speeds and direction would have easily foiled that plan.

[Robe]

Typically, an approach is flown at about 15% greater than stall speed. If the target approach speed of is publicized at 137 knots, then its stall speed would be about 120 knots (or about 138 mph). This would be in the landing configuration, gear and flaps down.
In the clean (cruse)configuration it would be substantially higher , prob about 180Kts or around 200 mph.
I would submit to all that at those speeds an aircraft as large as a B-77-200ER/LR would be like hitting concrete, no gentle floating down to the bottom like a model in a bathtub.
No,debris would be everywhere.
I once spotted a crashed Money near Austin TX, at first I thought the debris field was a trash dump. Airplanes are not as durable as they seem sitting on the ramp, they tend to crumple like Alum. Foil.