Greg Brooks, co-manager of Sub Sea Research, is seen aboard the salvage ship Sea Hunter in Boston Harbor Wednesday, Feb. 1, 2012, holding a picture of the British merchant ship Port Nicholson, which was sunk by a German U-boat in 1942 with a cargo of 71 tons of platinum now worth about $3 billion. (AP Photo/Winslow Townson)

Photo by: Winslow Townson

Greg Brooks, co-manager of Sub Sea Research, is seen aboard the salvage ship Sea Hunter in Boston Harbor Wednesday, Feb. 1, 2012, holding a picture of the British merchant ship Port Nicholson, which was sunk by a German U-boat in 1942 with a cargo of 71 tons of platinum now worth about $3 billion. (AP Photo/Winslow Townson)