The Port Nicholson, a British merchant ship, has been stuck on the bottom of the Atlantic Ocean for 70 years. But now treasure hunter Greg Brooks says he’s found not only the vessel but also the roughly $3 billion worth of platinum that sank with it when a German U-boat attacked it, killing six people on board. The British government says Brooks is overhyping the find, because its initial research is showing that the ship was carrying mostly machinery, but Brooks counters that a U.S. Treasury Department document shows the platinum was on board and on its way to pay the Soviet Union for war supplies. If the wreckage proves lucrative, the treasure hunter will have a fight on his hands. The British government may file a claim on the cargo.