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51 impression for yourself. Just a minute...I have to try to convert the measurements approximately into your units. It is a dome-shaped cavern at a distance of about 4300 meters from the Earth's surface. The cavern was organized as a colony about 3000 years ago; a major portion of the ceiling structure is artificially integrated into the rock and the form was remodeled into an almost elegantly proportioned and very flat dome with an oval ground plan. The diameter of the dome according to your measures is about two-and-a-half kilometers. The height of the dome at the highest point is about 220 meters. Underneath that highest point in every colony there stands a special whitish-gray cylindrical building—a kind of supporting column which holds the honeycomb net-carrying structure of the dome. This building is the tallest, largest and oldest in the entire dome for it is always situated as the first construction together with the security of the ceiling. (In the meantime of course there were times when it was completed and reconditioned.) That building has a very special name and religious significance. We have only one of those columns; larger colonies even have more columns according to the construction of the ceiling. One of the main colonies in Inner Asia has as an example 9 of those kinds of supports, but that colony is also over 25 of your kilometers in size. The central building is generally a center of religion, but also a center for climate control, and a center for the behavior and the regulation of the lighting system. We have at our location all together 5 large artificial light sources which generate your UV light and its warmth through gravitational sources. The air shafts and the light systems from the surface likewise run through these columns and naturally, they are very intensely controlled. By the way, we have 3 air shafts and 2 elevator systems there, and even a tunnel connection to the next main colony which lies approximately 500 kilometers to the southeast. One elevator shaft leads to a cavern near the surface, the other leads to one of our depots for the ships—you remember, the cylindrical ships— that is naturally concealed closer to the surface behind a rocky mountain face. Normally, there are only three ships there—it's a small depot. The other buildings of the colony are, for the most part, concentrically ordered in oval circles around the main supporting column, and they are without exception much flatter; generally only between 3 and 20 meters tall. The shape of the buildings is round and dome-like. The color is even differentiated according to circle and distance