"Damned if I know." Crag flashed his torch into the rill. It was wide and deep, a cleft with almost vertical sides. They would have to go around it. He flashed the light in both directions along the plain. There was no visible end to the fissure. He studied the stars briefly and said, "East is to our right. We'll have to work along the rill and gamble that it ends soon." It did. They rounded its end and resumed their way toward the east. Crag had to stop several times to get his bearings. The shadows danced before the torch beams confusing him, causing odd illusions. He fell to navigating by the stars. It occurred to him that Baker, measured against the expanse of the plain, would be but a speck of dust. Richter's voice broke reflectively into his earphones, "Oxygen's about gone. Looks like this place is going to wind up a graveyard." Crag said stubbornly: "We'll make it." "It better be soon...." "We should be about there." They topped a small rise and dropped back to the plain. The needle of Drone Baker punctuated the sky--blotted out the stars. Oxygen ... oxygen. The word was sweet music. He broke into a run, reached its base and clawed at the ladder leading to its hold. He got inside panting heavily, conscious of a slightly dizzy feeling, and grabbed the first cylinder he saw. He hooked it into his suit system before looking down toward the plain. Richter was not in sight. Filled with alarm he grabbed another cylinder and hurried down the ladder. His torch picked up Richter's form near the base of the rocket. He hooked the cylinder into his suit system and turned the valve, hoping he was in time, then flashed his torch on the German's face. He seemed to be breathing. Crag called experimentally into the earphone, without answer. He finally snapped off the torch to conserve the battery and waited, his mind a jumble of thoughts. "Commander...?" "Good. I was scared for a moment." He flashed the torch down. Richter's eyes were open; he was smiling faintly. "Not a bad way to go," he managed to say. "Nice and easy." "The only place you're going is Red Dog." "I'll be okay in a minute." "Sure you will." Richter struggled to his feet breathing deeply. "I'm okay." "We'd better get some more oxygen--enough to last through the fireworks," Crag suggested. They returned to the drone and procured eight cylinders, lowering them with a piece of line supplied for the purpose. They climbed down to the plain, packed the cylinders and started for Red Dog. "Going to be close but we'll make it," Crag said, thinking of the warhead. Richter answered confidently: "We'll make it."