Salvage experts successfully refloated the freighter 'Paul R. Tregurtha' from downbound channel St. Mary's River. Two tugs with a combined 4,000 horsepower, moved the stern of the ship into the middle of the channel. This enabled salvage experts to successfully raise the ship’s bow by filling stern voids which reduced the amount of forward weight on the rocks. The vessel was cleared to proceed to anchorage near Detour, Mich., where the owners, the Coast Guard marine inspectors…