... malfunction, and making their way back to the surface would be even more diffi cult because of the moving ice fl oes. If they failed to fi nd the exact spot where they had started then the submarines ... elsewhere.Soon the two men were ready to move, and slowly their vessels sank down into the water beneath. From their cockpits they looked up and saw the daylight shine through the ice circle above them ... from view and then disappeared altogether. Now, after so much preparation, they started their long journey to the sea-bed, carefully mapping their path so they could retrace their steps.Finally,...