sentences:  On October 2, 1943, the old ferry harbor in Gronsund was also a location used by the Danish resistance to transport fleeing Danish Jews on fisherman boats to Sweden to escape the German attempt to round up the Danish Jews, as detailed in Bo Lidegaard's book Countrymen.On March 29, 2001, the oil tanker "Baltic Carrier" collided with the bulk carrier "Tern" in the western Baltic Sea, near the naval border between Germany and Denmark.2700 tons of bunker oil leaked from the cargo tanks into the sea, affecting the Danish shoreline, especially Grønsund.