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It's not sealed, it's positive pressure, of course.
It's also okay to have the entrance and exit of the underground garage facing the bathroom, as long as you think it's good.
There is absolutely nothing wrong with this problem, and it is best to deal with it if there is something wrong.
It should be that the pipe under the floor of your bathroom is leaking (the pipe joint is cracked and seeping, or the pipe is cracked and a crack is broken...). And so on) so you don't perceive it.
The beams and columns of the building are not perforated, and anyone who ignores these regulations can report to the quality supervision department of the Construction Committee. I hope my answer can help you.
Generally, no.
Because the general floor slab is not much thick, it is generally not possible to bury pipes into it. >>>More