We got an up close look at the construction project underway to add a new lock at the Soo. | MLive.com

The Great Lakes hold an estimated 6,000 shipwrecks and 30,000 lives lost, often preserved in cold, freshwater depths. Famous wrecks include the SS Edmund Fitzgerald (Superior), the "Christmas Tree Ship" Rouse Simmons (Michigan), and the 1913 storm casualties. Many remain undiscovered, though technological advances are increasing identification rates. Famous & Notable Great Lakes Wrecks SS Edmund Fitzgerald (Lake Superior): The largest ship to sink in the Great Lakes (1975). SS Bannockburn (Lake