Well, you already know what's behind that window.
I wonder how many people have died here. More specifically, how many have been ritually sacrificed here, before I came. Look carefully at the tiles in the bathroom. I guess there's nothing more to explain.
Now it's the turn of the bottoms of the ventilation shafts. I assume the most important one will be bricked up at the bottom. Be careful, you know where they work and there might be a fuse connected to an explosion. There is gas distribution throughout the house.

Notice the brief video interruption at the window. There's something there. The same interruption was also in Svatý Jan pod skalou /St. John under the Rock down in the crypt https://duckduckgo.com/?q=...
It all kind of fits together, doesn't it?

...and the bathtub is damaged in one spot, it looked like it was hit by a bullet (not visible in the video). I painted the spot with silver nail polish.

And now I have another questions? Why is the water draining so badly and how is it possible that [she] can influence the drainage below?...There's probably something stuck in there, isn't?...and "somewhere" the pipe is cut.

Interesting🤔..., shortly after I sent this post, it suddenly feels better to breathe here.

...so carbon monoxide?
dull headache
weakness
nausea
feeling like vomiting
confusion
dizziness
difficulty breathing
strange taste in the mouth
At night I sometimes felt like I was going to faint.