The toilets in a building are definitely all of the same style, so Dr. Zhang was certain this was the toilet of the mental hospital he was in!
As mentioned earlier, as soon as they climbed out of the hole, they saw a row of urinals, and next to the urinals was the door to the men's toilet. On the opposite wall was a row of partitioned cubicles... Yes, those were the kind of stalls made of wooden planks, with open space above the head, and doors that could be kicked open, used for defecating.
To the left of the defecation cubicles were a row of sinks, with a large mirror mounted on the wall that nearly covered the entire wall... The last wall had two windows, and naturally, both were obscured by frosted glass, so please refrain from any dirty thoughts...