I highly doubt it. Salt water is very corrosive, espeically over a long period of time. Your question reminds me of an old episode of the Twilight zone, good stuff. But nah, i really doubt it. Boats that have reamined on the surface, in care of musems and such are arguably too old now, and could dive sure, but probably woudlnt make it back to the surface.
At best, all youd find is maybe a small pocket of trapped air in the ceiling of a compartment, but thats about it.
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