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AdvancedBoat Dive
Mary Alice B Wreck (Sanilac Shores Underwater Preserve)
Michigan, United States
Depth85–95 ft (25.9–29 m)
AccessBoat
Cert LevelAdvanced Open Water; wreck training for interior
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June-September
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The Mary Alice B is a 62-ft steel tug built in 1931 for the Army Corps of Engineers (originally named Quintus) that foundered off Port Sanilac in September 1975 and was located in 1992. She sits upright and remarkably intact in about 92-95 ft of Lake Huron within the Sanilac Shores Underwater Preserve. The pilothouse, with the wheel still in place, offers a swim-through for trained divers, though silt is easily disturbed inside.
Quick Facts
Depth Range25.9m – 29m
CertificationAdvanced Open Water; wreck training for interior
GearDrysuit or thick wetsuit, primary and backup lights
HazardsDepth, dark cold water below thermocline, silt-out risk inside pilothouse, entanglement
boatwreck
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