The Sub Sea Research crew had spent months in 2008 futilely scouring a wide swath of ocean off Cape Cod in search of the SS Port Nicholson, a merchant ship that sank in 1942 while laden with platinum now believed to be worth $3 billion.
http://articles.boston.com/2012-02-01/metro/31008710_1_shipwreck-crew-members-merchant-ship