Associated Press
In this June 16, 2013 file photo provided by Great Lakes Exploration Group, diver Jim Nowka of Great Lakes Exploration Group inspects a wooden beam extending from the floor of Lake Michigan that experts believe may be part of the Griffin, a ship that sank in 1679. A wooden beam that has long been the focus of the search for a 17th century shipwreck in northern Lake Michigan was not attached to a buried vessel as searchers had suspected, but still may have come from the elusive Griffin or some other ship, archaeologists said Wednesday, June 19, 2013 (AP Photo/Great Lakes Exploration Group, David J. Ruck, File)

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