On the morning of November 20, 1944, a single U-boat cruised silently at periscope depth beneath the rough waves of the North Atlantic, lurking just a few kilometres off the Northwest coast of Iceland’s Reykjanes peninsula. The lone periscope was virtually invisible in the turbulent grey ocean waters. The German submarine, type VIIC/41, designated U-300, was commanded by 24-year-old Lieutenant Fritz Hein with a crew of 50 men barely out of their teens. Their mission was simple: To attack and destroy Allied vessels off the southwestern tip of Iceland as they approached the Icelandic mainland from North America. The bigger the ship they could sink, the better.