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We promote diving and conservation of the shipwrecks in Michigan's 13 designated Underwater Preserves, plus Isle Royale. These shipwrecks document the maritime history of the region, and are often found in good condition even after being submerged for 100+ years. Michigan's underwater preserve system occupies more than 7,000 square miles of Great Lakes bottomlands and protects some of the region's most sensitive and historic underwater resources.