For many minutes I stared in wonder at it. Far away it was; it looked very small. It was like a little heap of light poured from the hand of a fire-god. What it might be, I could not imagine. At first sight, I imagined it might be a volcano with streams of incandescent lava flowing down the side. I knew that this continent of mystery boasted Mt. Erebus and other active craters. But there was none of the smoke or lurid yellow flame which accompanies volcanic eruptions. I was still watching it, and wondering, when the catastrophe took place--the catastrophe which hurled us into a mad extravaganza of amazing adventure. Our little two-place amphibian was flying smoothly, through air unusually good for this continent of storms. The twelve cylinders of the motor had been firing regularly since we took off from Byrd's old station at Little America fifteen hours before. We had crossed the pole in safety. It looked as if we might succeed in this attempt to penetrate the last white spot on the map. Then it Happened. A sudden crack of snapping metal rang out sharp as a pistol report. A bright blade of metal flashed past the wing-struts, to fall in a flashing arc. The motor broke abruptly into a mad, deep-voiced roar. Terrific vibration shook the ship, until I feared that it would go to pieces. Ray Summers, with his usual quick efficiency, cut the throttle. Quickly the motor slowed to idling speed; the vibration stopped. A last cough of the engine, and there was no sound save the shrill screaming of the wind in the gloomy twilight of this unknown land beyond the pole. "What in the devil!" I exclaimed. "The prop! See!" Ray pointed ahead. I looked, and the dreadful truth flashed upon me. The steel propeller was gone, or half of it at least. One blade was broken off at a jagged line just above the hub. * * * * * "The propeller! What made it break? I've never heard--" "Search me!" Ray grinned. "The important thing is that it did. It was all-metal, of course, tested and guaranteed. The guarantee isn't worth much here. A flaw in the forging, perhaps, that escaped detection. And this low temperature. Makes metal as brittle as glass. And the thing may have been crystallized by the vibration." The plane was coming down in a shallow glide. I looked out at the grim expanse of black ice-crags and glistening snow below us, and it was far from a comforting prospect. But I had a huge amount of confidence in Ray Summers. I have known him since the day he appeared, from his father's great Arizona ranch, to be a freshman in the School of Mines at El Paso, where I was then an instructor in geology. We have knocked about queer corners of the world together for a good many years. But he is still but a great boy, with the bluff, simple manners of the West. "Do you think we can land?" I asked. "Looks like we've got to," he said, grimly. "And what after that?"