By this time the sun had dropped below his vision. He knew that any minute the Martian night would come with awful suddenness. And with it, would come ... other things. But Ketrik was unprepared for what came in that moment. He heard a sudden sharp _whirr_ of blades, and a 'copter appeared above him! It swept so low he could almost see the pilot. There was no doubt the pilot had seen him, for a heat-beam sliced downward, swept along the Canal floor. Ketrik leaped aside, hugged the sandy wall. Then the 'copter was gone, but Ketrik knew it would circle and return. That could only mean one thing. The caravan had reached the Station, and one of those Martians had spoken of him to the Specials. Ahead, through the gloom, the Canal seemed to dip into a sort of culvert. He raced for it as he heard the whirring blades again, entered the dark tunnel just as the heat-beam sprayed downward, sending the sand into molten froth. Ketrik groped forward in darkness. The tunnel leveled and continued. Ketrik's heart leaped as he realized where he was. This was one of the abandoned Canals which had been filled with slag from the Martian mines. But years ago pirates had conceived the unique idea of burrowing through it, making a perfect retreat from Turibek to the mountains! * * * * * Suddenly he started. Far behind he heard a scuffle of steps. That could only be the Martian Special! There was no doubt, now, that word had gone to Dar Vaajo; they really wanted to stop him! Ketrik grinned and went on, hurrying his steps a little. Rajecs could see in the dark, but Martians couldn't. If it came to a showdown.... His grin soon vanished. All about him now he heard vicious little animal squeals, the scuffing of tiny feet. Scavengers! There must be thousands of them. He saw their baleful red eyes. They gradually grew bolder, began nipping at him. Soon his trousers were in shreds from the knees down, and he felt the flow of blood. There was one satisfaction. The Martian coming behind must be suffering the same treatment! But the man kept coming. The footsteps were dogged and Ketrik knew he had a real antagonist here. Now the scavengers were becoming more than annoying. He knew that before he ever reached the city, he would weaken from loss of blood and they'd pull him down. He could use the electro to clear a path through the vicious beasts--but he knew the one coming behind was waiting for that, waiting for any sign of light that would give him a clear target. Ketrik gritted his teeth and went on, occasionally kicking out at the beasts in the dark. It didn't do much good. Then, far ahead, he saw the faintest glow of light. It seemed to come from around a bend in the tunnel. If he could only get up there in time--and beyond that light, before his pursuer came into view....