Sewer...
That's not a good place.
The sewer in the Royal Palace isn't as spacious as people imagine, because this is Nagariel.
As long as it doesn't flood on rainy days, it's not a problem for the people here.
Sewage?
That's called sewage?
So the Royal Palace's sewer is very narrow, with a diameter of only two feet.
A normal person can easily crawl through the pipes, but that would have to be in new pipes.
Old pipes have all sorts of accumulations that haven't rotted despite being soaked for a long time, so they rarely degrade naturally, eventually clumping together and entangling.
Some you can remove, while others, in a continuous calcification state, have merged with the pipe walls.
Even if the pipe is smashed, it won't break.
This also leads to the actual space of the sewer being much narrower than people imagine, especially in some bends, where it's impossible to pass.
