how do boats get from great lakes to ocean
Great Lakes Waterway Together with the Saint Lawrence Seaway, the Waterway allows both ocean-going vessels and the ore, grain and coal-bearing lake freighters to travel from the system's saltwater outlet to its far interior. The Waterway has larger locks and deeper drafts than the lower Seaway, limiting large freighters to the four lakes upstream of the Welland Canal and Lake Ontario, and similarly restricting passage beyond the canal by larger ocean vessels. The two waterways are often jointly and simply referred to as the "St. Lawrence Seaway", since the Great Lakes, together with the St. Lawrence River, comprise a single navigable body of freshwater linking the Atlantic Ocean to the continental interior.
SS Edmund Fitzgerald Carrying a full cargo of ore pellets with Captain Ernest M. McSorley in command, she embarked on her ill-fated voyage from Superior, Wisconsin, near Duluth, on the afternoon of November 9, 1975. En route to a steel mill near Detroit, Fitzgerald joined a second freighter, SS Arthur M. Anderson. By the next day, the two ships were caught in a severe storm on Lake Superior, with near hurricane-force winds and waves up to 35 feet (11 m) high. Shortly after 7:10 p.m., Fitzgerald suddenly sank in Canadian (Ontario) waters 530 feet (160 m) deep, about 17 miles (15 nautical miles; 27 kilometers) from Whitefish Bay near the twin cities of Sault Ste. Marie, Michigan, and Sault Ste. Marie, Ontario—a distance Fitzgerald could have covered in just over an hour at her top speed. Although Fitzgerald had reported being in difficulty earlier, no distress signals were sent before she sank; Captain McSorley's last message to Anderson said, "We are holding our own." Her crew of 29 perished, and no bodies were recovered. The exact cause of the sinking remains unknown, though many books, studies, and expeditions have examined it. Fitzgerald may have been swamped, suffered structural failure or topside damage, been shoaled, or suffered from a combination of these.