The Wildings came cautiously, but they needed light to move at all. Light splashed off the rock around the corner. Shadowy figures moved behind the light. Heydrick pressed the trigger, and a pale beam flicked the darkness. In the close confinement of the tunnel, the shattering blast stunned their brains. The explosion stopped some of the pursuit, but a scuff of boots on rough rock warned Heydrick. Needles from paralysis guns snicked nastily from the naked rocks beside them. He and the girl turned and fled headlong through the darkness. Pain forgotten, he thrust Ria ahead of him, and pried up part of the strands. Heydrick followed, stumbling and swearing. In the darkness ahead, he heard Ria cry out. Unable to stop, he too collided with what seemed to be a solid wall of metal. Heydrick flicked the radilume switch. Light flooded an ore depot, with rusting electric cars. "Ore cars," he gasped. "Get in." He boosted the girl up and scrambled after her. Heydrick fumbled for the switch, found it. The car leaped ahead as a blaster beam licked the rails behind them. With shaking hands, Heydrick re-primed his blaster and fired wildly at the darkness behind them. Shadows danced. It seemed seconds before the blasts went off. Two in rapid succession. Another car leaped from the dust cloud behind. It was pursuing them on the parallel tracks. A blaster beam grazed the back wall of the ore-car. It was gone with a flash and a roar. The shock flattened Heydrick and the girl against the front wall. Heydrick re-primed his gun, but it was impossible to aim. The tracks went into a black maw and went up in a steeply climbing spiral. Flanges screamed wildly as the wheels bit into the curves. Up. Up. Up. The miles raced backward in a dizzy flow of darkness lit by faint reflections from the radilume. Suddenly the track levelled off on a straightaway. Heydrick peered ahead. Heaven alone knew where the tunnel led or how far the tracks were good. The car was going like a runaway rocket. Then they were out in the open, in daylight. The tracks came out of a tunnel-mouth on the banks of the dry canal. The hurtling ore-car was half way across the bridge before Heydrick knew they were heading for the city. Out of the tunnel-mouth across the canal shot the other ore-car. Both cars raced toward the city. Ten miles. Five. Three. One. Weird lights flickered on the tremendous dome ahead, as if some infernal carnival was being held within the city. Up a steep ramp to the airlock shot the cars. Seconds now. The airlock was closed. A gate of metal and plastic loomed close. Glass, plastic, metal and quartz vanished in a thunderous melee of sound. The first lock. The city's automatic wall-magnets clawed at the racing car. It slowed rapidly. The deceleration pinned both of them flat against the front wall of the car. It went through the second gate like a knife through dough. The jar was agony. The car rolled up to a dock and stopped.