Masterson, a grimy and bullet-headed little man with a drooping mustache and something of the look of a mournful Airedale, slapped the side of his duro-glass helmet in a casual salute. Larry knew that the ship was being left in good hands. He had come to have considerable respect for the taciturn engineer. He did not know why Masterson was on board the _Sky Maid_, very likely because he had been in some trouble similar to Larry's own, but he was certainly an efficient engineer. He wished he felt as sure of the three men who were going ashore with Ripon and himself. Colton he considered thoroughly untrustworthy, and the two quartermasters were a pair of sullen derelicts of the sort that Ripon had picked up off the beach for most of the crew. "Landing party ashore!" Ripon snapped. "Let's get going! This isn't an ordinary exploring party, and every hour counts." VII They stood on a bare expanse of pitted rock. The _Sky Maid_ had crashed on the outer slope of one of the craters, and the ground rose steadily to the jagged rim of the rocky bowl. Other bare peaks were all about them, black teeth against the starry sky. The earth gleamed large and pale above them. The scene was bleak and silent, unutterably desolate and forlorn, and the little group of Earthlings drew closer together. Then Ripon pointed up the ridge. "We'll go up there and look around. Larry--you carry the radium detector. We mustn't let the exploring fever make us forget our main purpose in having come here." They toiled slowly up the slope. Walking was difficult. Due to the power of their Earthly muscles on this planet of so much lighter gravity, they had a tendency to bound into the air at each step in spite of the heavy leaden soles on the feet of the space suits. Gradually they learned the necessary muscular control, a sort of sliding step, and then they made better progress. Ripon was some yards in the lead as they reached the rim of the crater. For a moment the tall scientist was silhouetted against the stars, then he abruptly dropped flat on the rock and motioned back to them to do the same. His voice was a faint whisper in the ear phones. "Crawl up here slowly, one at a time. Careful!" Larry was the first to join him, lying flat on the rock at Ripon's side. Together they peered down into the crater. It's flat floor was swarming with some sort of queer animal!