Colonel Walther Mannheim tapped with one thick finger the map that glowed on the wall before him. "That's his nest," he said firmly. "Right there, where those tunnels come together." Bart Stanton looked at the map of Manhattan Island and at the gleaming colored traceries that threaded their various ways across it. "Just what was the purpose of all those tunnels?" he asked. "The majority of them were for rail transportation," said the colonel. "The island was hit by a sun bomb during the Holocaust and was almost completely leveled and slagged down. When the city was completely rebuilt afterwards, there was naturally no need for such things, so they were simply all sealed off and forgotten." "He's hiding directly under Government City," Stanton said. "Incredible." "It used to be one of the largest seaports in the world," Colonel Mannheim said, "and it very probably still would be if the inertia drive hadn't made air travel cheaper and easier than seagoing." "How did he find out about those tunnels?" Stanton asked. The colonel pointed at the north end of the island. "After the Holocaust, the first returnees to the island were wild animals which crossed over from the mainland to the north. The Harlem River isn't very wide at this point, as you can see. There was a bridge right at about this point here--the very tip of the island. It had collapsed into the water, but there was enough of it to allow animals to cross. Because of the rocky hills at this end of the island, there were places which were spared the direct effects of the bomb, and grasses and trees began growing there. That's why it was decided that section should be left as a game preserve when the Government built the capital on the southern part of the island." His finger moved down the map. "The upper three miles of the island, down to here, where it begins to widen, are all game preserve. There's a high wall at this point which separates it from the city, which keeps the animals penned in, and the ruins of the bridges which connected with the mainland have been removed, so animals can't get across any more. "Two years after he arrived, the Nipe was almost caught. He had managed to get here from Asia by stealing a flyer in Leningrad. According to Dr. Yoritomo and the other psychologists who have been studying the Nipe, he apparently does not believe that human beings are anything more than trained animals. He was looking then--as he is apparently still looking--for the 'real' rulers of Earth. He expected to find them, of course, in Government City. Needless to say," said the colonel with a touch of irony, "he failed." "But he was seen?" asked Stanton.