Explorer Johannes Krafft leads an expedition to Greenland, where he hopes to find his missing colleague Lorenz. During their mission, the group is stranded on a giant iceberg which threatens to drift into the open sea. When a desperate rescue attempt by Krafft′s wife Hela, whose plane crashes on landing, also fails, their fate appears to be sealed. But virtually in the last minute, the remaining survivors are rescued by famous pilot Ernst Udet.