This is a portion of an article posted written by Christopher Solomon of Smithsonian Magazine.

On the still, moonlit night of September 26, 1903, a tug urged the barge Harold out of what’s today the South Street Seaport and south past the Statue of Liberty. The Harold’s load that night was nearly 7,700 silver-and-lead bars. They were destined for the glowing Asarco smelters of Perth Amboy, New Jersey. The silver, and the smelters, belonged to the Guggenheim family, which had made its fortune in mining and smelting.

The cargo never arrived, at least in one batch. Somewhere in the Arthur Kill tidal strait the Harold tipped, sending most of the silver bars to the bottom. The barge’s deckhands—“dumbest skunks I ever had to do with,” the salvage company’s owner later told the New York Times—didn’t notice until docking at dawn. A secret salvage effort recovered about 85 percent of the bars, but that still left up to 1,400 “pigs” unfound. Today they could be worth $20 million.

One morning last fall, Ken Hayes set out to find himself some sunken treasure—that is, if no one got to Hayes, or to the treasure, first.