Facts and figures about the Edmund Fitzgerald:

—At 13,632 tons and 729 feet long, was the largest Great Lakes freighter from its launch in 1958 until 1971.

—Hauled taconite ore pellets between Silver Bay, Minn., and steel mills in Detroit and Toledo area.

—Sank in Lake Superior during storm Nov. 10, 1975. All 29 crewmen lost.

—Wreckage lies 530 feet below surface.

—Coast Guard investigation found probable cause was loss of buoyancy from cargo hold flooding due to ineffective hatch covers. Others believe ship hit shoal and damaged hull or had structural failure.