The steamship S.S. Republic went down off the Georgia coast in 1865, was located by Odyssey Marine Exploration in 2003, and is estimated to have $350 million in gold aboard . . . and gold has increased lately.
Mel Fisher's Atocha find was up to $450 million.
And whatever Cortez abscounded with from Mexico City may top both - but that was extorsion (after kidnapping Montezuma) and so a theft and not a find. ;-)
Excal 1000, Excal II, Sovereign GT, CZ-20, Tiger Shark, Tejon, GTI 1500, Surfmaster Pulse, CZ6a, DFX, AT PRO, Fisher 1235, Surf PI Pro, 1280-X, many more because I enjoy learning them. New Garrett Ca