I worked the Boeing 727 crash in Escambia Bay during May 1978. This was the "perfect" water landing and there was lots of debris in the form of suitcase pieces and clothing. The primary damage was to the belly of the fuselage where it first came in contact with the water at 100+ knots. There were pieces of the underside that floated and were recovered as well.

If you wish to research this crash, it was National Airlines Flight 193, the aircraft's name was "Donna". The aircraft was raised and taken via barge to the Pensacola Navel Airsta for sufficient repairs to fly out.

There were 3 dead. 1 from heart failure after getting into the water w/life jacket donned and 2 from drowning after getting into the water w/I life jackets.
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QMC, USCG (Ret)
The best luck is what you make yourself!