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Robert Duane Ballard is an American retired Navy officer and a professor of oceanography at the University of Rhode Island who is noted for his work in underwater archaeology and marine geology. He is best known by the general public for the discoveries of the wrecks of the RMS Titanic in 1985, the battleship Bismarck in 1989, and the aircraft carrier USS Yorktown in 1998. He discovered the wreck of John F. Kennedy's PT-109 in 2002 and visited Biuku Gasa and Eroni Kumana, who saved its crew.