I don't know if that's the right word, but as Yliakum is divided up into several levels, which APPEAR to have cliff-like edges, what would you see if you went to the edge of the current level. From the guide, it sounds like it would be a steep drop off, almost vertical. If you stood on the edge, would it be as if you were standing on the edge of a canyon? Would you be able to see all the way down to the lowest level? Would you be able to see the other side of the same level?
These questions can only be answered if we know the dimentions of each level. How wide is each level? How much is each level lower than the last? If we know these numbers (or even just the proportion of the measurements) we can determine sight lines. On the lower levels, you probably could see to the other side. On the higher levels, that's a question of air quality. Since PS is based in mideival times, I'd say there's very little pollution (except in big cities, where a bunch of fireplaces could cause smog. Of course there are volcanoes, but they don't erupt constantly (How are there volcanoes in a stalactite??) ) On a clear day, you should be able to see about 200 miles (this is through air. In water it would be much less)
Ok, so Yliakum is a self contained biome with its own ecosystem. The crystal is the source of energy for all the living things. Yliakum also must not have been naturally formed. A stalactite is formed naturallly through soft limestone, etc being dissolved in water and being left behind. It usually takes about 100 years per cubic centimeter Gold, silver, iron do not dissolve in water. The formation of the stalactite is truly a mystery. Maybe it was formed through tectonic activity?
Sorry if I cause any heads to explode with all the science, but this is cool to talk about!