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| Underwater air tower and transport tubes |
This is a drawing of an underwater tower in the main Castle
of Thelbia Bay. Because of the water pressure, rooms with air in them, or even
without air, are made up of strong glass and metal, and spade-shaped. The
air-room shown here is one of the closest rooms to the surface, and is still
twelve human feet under at the lowest tide. Merfolk come up here to give their
gills and fins a rest. The room is partly underwater, with seats just below the
surface, so that they can sit down, breathe, and talk to each other. Even
though they live in it, merfolk cannot drink salt water, (at least, not too
much of it) so they have fresh water pumped from a freshwater stream to the air
room, where they can fill up portable bottles and take a drink.
At the
closest few streams to the city, merfolk and helpful land creatures have
constructed water stations, half-submerged buildings where fresh water is put
to use and also pumped below the surface to the air rooms below.
