@michiganlegacyfiles: Frozen in 1870. ⚓ Part 47: The Sunken Ghost Ships of Munising. Why does Lake Superior keep these wrecks perfectly preserved for centuries? #MichiganLegacy #Munising #Shipwrecks #LakeSuperior #HiddenHistory Munising shipwreck tours, Bermuda shipwreck Michigan, Alger Underwater Preserve, Part 47 Michigan's Hidden World, Lake Superior ghost ships, hidden underwater history