The 80 meter long self-propelled tanker Luka went aground on the Rhine near St. Goar, Germany.  The Luka had made a navigational error and steered out of the fairway going aground into the shallows.  The lighter tanker Sankt Nikolaus arrived and unloaded 100 tons of the cargo of liquid fertilizer off the Luka.  Two tugs were able to refloat the Luka and the vessels proceeded to St. Goar.  Pumps were kept running on the Luka as the hull had suffered some damage.  No reports of injuries.