A Canadian company will turn in a report tomorrow outlining whether it thinks a tunnel under the Straits of Mackinac is a feasible option for its pipeline. A tunnel was suggested by Michigan Governor Rick Snyder. Enbridge owns and operates a pair of 65 year old oil and gas pipelines known as Line 5. It lies on the bottom of the Straits between Lake Huron and Lake Michigan. According to the Detroit News , Enbridge is expected to say a tunnel 300 feet underground is feasible.