216 m in diameter, 22 rooms m an extended trefoil with divided leaves Level 5 278 m in diameter, 49 rooms in sin hexagons around a central hexagon Workers dubbed this level "hexagon squared " Level 6 340 m in diameter, 61 rooms in a trefoil arrangement of six hexagonal rings with branches Level 7 402 m in diameter, 73 rooms in a trefoil of three hexagonal rings with complex, asymmetrical branches Level 8 464 m in diameter (theoretically), 89 rooms The eighth is the only level with an apparently random arrangement of chambers and the only one except for Level 1 to contain no crystals Researchers called this level ' the Wormhole ' Level 9 526 m m diameter, 121 rooms m a hexafoil arrangement of hexagonal rings, six with connecting stems Nicknamed "Leto's Bouquet" > Level 10 588 m in diameter, 175 rooms arranged m concentric galleries, "the Dragon s Lair * From the northeast corner of this level, a tunnel leads downward at a five-degree decline The ceiling of the tunnel has fallen or been made to fall about a hundred meters from the level opening, closing it for a considerable but undetermined distance If continued in a straight line (with an eventual ascension), it would pass under the intersection of longitude 50 east with latitude 60 north Nothing in mat region would explain its destination Excavation of the tunnel to determine its path will require heavy equipment and an enormous expenditure of funds, and cannot begin m any case until all the crystals have been cataloged and removed That task is proceeding slowly for one reason only despite diligent search, no in dex or catalog of the collection has yet been found, nor is there any grouping of materials by subject, date, area, author or any other arrangement jet tested Majority opinion at present is that there existed no system to the shelving of the contents Leto simply remem bered where each one was, startling as that may seem, and in view of his enormous lifespan saw no more need to classify them than we would to index the contents of each room of our houses The feeling one experiences within the structure is complex One feels dwarfed by the scale of the chambers, and the unvarying sameness of the rooms produces a lessening of alertness A typical room has walls and ceiling of the gray of synthrock, on each storage wall are rows of black metal shelves fixed one above the other at a distance of 260 cm The nduhan crystal papers he side by side on these shelves Unmodified glow plants encircle the room where the walls meet the ceiling and their dim light reflects from the crystals, casting patterns on the underside of each shelf much like those reflected from the surface of a pool of water Yet water reflections change as the water ripples, but the crystal reflections are un-moving, unchanging When someone with a heavy tread approaches the position of the observer his tread sets up \ibrations in the crystals, making the reflections quiver long before the footfall is hear