He is most known 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.
Han er mest kendt for opdagelsen af vragene af RMS Titanic i 1985, slagskipet Bismarck i 1989 og vraget af hangarskibet USS Yorktown i 1998.