SAULT STE. MARIE, Mich. — The Coast Guard oversaw the response and salvage Wednesday afternoon as the U.S. Army Corps of Engineers successfully refloated the tug Hammond Bay, which sank in the St. Marys River Monday morning. The cause of the sinking of the tug is unknown and under investigation. The tug was lifted out of the water by the crane barge Harvey as traffic along the St. Marys River...