The crowd seemed to have thinned out somewhat, so he supposed the evening rush was about over. As in terminals nearly everywhere Dan had been, most of the people moved briskly, intent on their own affairs. No one paid much attention to Dan while he glanced around, noting the wall of flashing lights and moving letters, similar to but far larger than the one he had seen before, and a series of sizable blocky structures with large numerals suspended above them, and the stylized outlines of doorways on their four walls. People appeared in front of these doorways, or strolled directly toward them and vanished, hesitating only when a red glow outlined the door to show that someone was coming through from the other side.

In the center of the room toward either end were large silvery structures with the word "Information" hanging above them. Dan went to one and found that vertical blue lines divided it into twenty-four sections, with room left over for more that weren't there as yet, plus a section headed "General Information."

Dan studied the numerous slots, went to the General Information section and spent most of his change. He sat down with a small package of maps and folders and soon had before him a cross-sectional drawing showing a series of spherical layers one inside the other, labeled, "Level 1—Retail," "Level 2—Retail," "Level 3—Wholesale," "Level 4—Manufacturing," and so on, numbered from the outside in toward the center of the sphere, from one to twenty-five.

Dan sat perfectly still for a moment, looking at this. He leafed carefully though the folders, and was soon convinced that this wasn't a map of underground layers under just one city, but of an interconnected system that appeared to stretch over most of the planet. The surface was labeled, "Recreation—Ordeals—General."

The complex of underground layers seemed to be much thicker than separate floors of a building would be; the map showed cross-sections of buildings of many stories in the individual layers.

Dan studied the map further and found that Level 10 was marked, "Coordination—Government." Dan walked to the information machine and came back with a general map of Level 10, which was divided into sixteen sections. Sections 4 and 5 were headed "Government Sections," and Dan got large-scale maps of each of them.

What he was looking at was being reproduced far away on big screens, and instantly recorded, to be examined in detail by staffs of trained men. He was thankful this was so. The map was a maze of colored lines, blocks, and curves, with numbered lists up and down both sides and across the bottom.

Abruptly, Kielgaard's voice said, "Dan, see that dark purple oval a little to the left of the center of the page?"

"I see it." Dan glanced from the number to the list at the side of the page and read, "War Ruler's Control Center."