FAIRPORT, Mich. -- French and U.S. experts are continuing their search for the 17th-century ship Griffin, which they believe sank in northern Lake Michigan in 1679.

Three French underwater archaeologists were planning to dive Monday afternoon at a site near Poverty Island, where expedition leader Steve Libert believes the vessel sank. He discovered a wooden beam jutting from the lake bottom in 2001.

Crews are digging a pit at the base of the beam to see if it's attached to a buried ship. Leaders say they hope to have an answer soon.

The search is stirring excitement in the Upper Peninsula community of Fairport, where about 40 experts and support crew members are encamped by the lake.