In November 1942, the SS City of Cairo was sunk by a German U-boat while carrying 100 tons of silver.
The vessel sank to more than 16,800 feet (5,150 meters) where it was undiscovered until 2011 by Deep Ocean Search.
The City of Cairo was bring silver rupees from India to England as part of the war effort.
The ship was off the coast of Brazil when two torpedoes sank it.
A Deep Ocean Search sub found the City of Cairo split in two, buried by silt.
The retrieved coins were melted and sold, according to the BBC.
Only a handful of people died as the ship sank but about 100 more died during the desperate attempt of the ship's six lifeboats to make it to land.
At today's rate, 100 tons of silver would be worth about $50 million.