In fog on 5 July 1942 HMS Niger mistook an iceberg for Iceland’s North Western Cape and led six merchant ships of Murmansk to Reykjavík convoy QP 13 into Northern Barrage minefield SN72 laid one month earlier at the entrance to the Denmark Strait. Every ship detonated British mines. There were no crewmen lost aboard the Soviet freighter Rodina (4441 GRT), the Panamanian-flagged freighter Exterminator (6115 GRT), or the American freighter Hybert (6120 GRT); but 46 civilian crew and 9 Naval Armed Guards died aboard the American Liberty shipJohn Randolph (7191 GRT) and freighters Hefron (7611 GRT) and Massmar (5825 GRT); and there were only eight survivors of the 127 men aboard Niger. Only Exterminator could be salvaged. The value of the Northern Barrage was questioned following the accident.