F6F 42782
according to database
http://www.chinalakealumni.org/Accidents.htm this aircaft was involved in a accident in June 1944 while part of CASU-6.
Ditched during carrier qualifications Sep 30, 1944 125 mi SE of Nantucket Island.
http://lostaircraft.com/database.php...changeset_id=0
Located by submarine *Alvin* Sep 24, 1968.
Note on 30 Sept 1944 ditching the pilot is reported to have survived.
https://www.whoi.edu/page.do?pid=10737
Note By the way a picture of the aircraft was shown in a National Geographic article on "Alvin" giving the plane nUmber as well