Steam Rooms

Description
Steam rooms are deep subterranean structures part of the Yggdrazen inner-working. Those rooms have a funnel shaped bottom, surrounded by a flat walkway. This funnel is an artificial lake connected, at the bottom, to the Core cooling system. Meanwhile, the ceiling have an inverted funnel shape, leading supposedly to surface vents. Those rooms have varying depth, diameter and height. Those rooms do not require any operators and most are considered unreachable by conventional means (Maintenance corridor, access tunnels, etc.) as it is typical of Novan infrastructure design.

Function
Those rooms are believed to have many functions in the Yggdrazen system regulation, the two most explicit being:

- Core temperature regulation (although simple water evaporation is theoretically far less efficient than most heat-exchanger technologies.)

- Water cycle evaporation, as those structure behave like subterranean version of surface evaporation towers.

It is noteworthy to say that arcane concentration is abnormally high (code 2 to 4) in those rooms compared to surface levels, possibly due to core proximity, root proximity or permeability of the water system itself.

Distribution and its effects
Those rooms are spread non-uniformly beneath the habitable surface and at various depth. Their amount increase toward the center of the habitable terrain, and their size generally increase with depth.

Saronite rooms
Close to surface and distant from the landmass center, those rooms are carved out of the saronite body of the yggdrazen and display a standard novan architecture, sharp and hexagonal, surfaces white and usually marked with identification numbers on their walls. Their diameter goes from 20m to 70m. Those rooms are most of the time code 2.

Leukrite rooms
Deep rooms are often at the vicinity of Saronite - Leukrite junction. Their hexagonal diameter goes from 30m to 250m. Although of the same original conception, those rooms were gradually twisted by the saronite transformation. Today, their smooth coppery walls and funnels only leave subtle hints of their original hexagonal shapes. Additional piping cover most of the rooms walls and ceiling. Those areas are at least code 3.

Zhinite rooms
Deepest rooms are on the verge of Leukrite to Zhinite junction. Their original diameters range from 200m to 15 km. The leukrite transformation made those rooms shape irregular, most surfaces are no longer smooth but instead formed by various layers of pipes fused together. Those rooms are always code 4. It is to be noted that hundreds of smaller rooms (10 to 50m) seems to have formed, as they did not existed on the original blueprints.

Known rooms
Saronite rooms are commonly beneath most large settlements and cities.

The six largest leukrite rooms are beneath each of the six capital cities.

The largest steam room known is a Zhinite room, Herka Majoris, just on top of the Core, it is 15 km in diameter, its irregular edge form numerous smaller pools. It is believed to be originally three coterminous smaller rooms.