(REUTERS) — A Maine seafarer said he found the wreck of a World War II merchant ship off the Massachusetts coast, sunk while ferrying a load of the precious metal platinum valued today at nearly $3 billion, an unprecedented find that left some doubting the cargo.

Greg Brooks of Sub Sea Research in Gorham, Maine, said on Thursday he discovered the submerged ship in 2008 some 50 miles off the Massachusetts coast and, using a remotely run submersible vessel, identified it last summer as British freighter Port Nicholson.

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