Pipes in Part 1 Ch. 3

[Nice to Have]

Replaying this part right now. I remember I wasn't able to solve this on my first run, but instead did proceed via the drawbridges (which is one way).
Now, is there an alternative path here?
http://steamcommunity.com/sharedfiles/filedetails/?id=1166277893
The note says all pipes "in this room" should be closed to disable water sensors. (I'm not sure what disabling the water sensors is supposed to help in the first place.)
All pipes "in this room" are closed on the screenshot, but nothing happens. So I assume I should try to close ALL pipes. But the handle of A2 (outside of pipe room) wom't budge (green light on), and the pipe is broken.

Is there something here to achieve at all? Subtle hint?! Thanks!

[Soggy]

Ok so both the drawbridges and this room lead to the same event (tunnel collapse). You need to turn off all the lights, so turn all the wheels in this room that you can find until the lights are off. One of them starts in the off position. Once all lights are off, click the little blue button up to the right. It's not obvious, but it is in fact a button.

Also, bring the wheel/handle you find in the little kitchen area with you, you will need it straight after this room.

[oku]

there is more discussion " Help with water sensors puzzle in Bergmann tunnel?" on May 17th if that also can be of help to you.

[Nice to Have]

OK thanks! So the water sensors are more or less irrelevant, I guess... Except for achievement perhaps, which I don't care about.
But I will try it anyway. Thanks again!

[Nice to Have]

Ah, a misunderstanding. The picture shows: dark red = on = open.
But dark red actually is supposed to mean light red = off = closed!
I think the devs should correct this diagramm, please!

[oku]

Originally posted by Nice to Have:

Ah, a misunderstanding. The picture shows: dark red = on = open.
But dark red actually is supposed to mean light red = off = closed!
I think the devs should correct this diagramm, please!

Deciphering the diagrams is part of the puzzling. In real life diagrams/charts/instructions are also misleading which like in this game can have disastrous results.

[Nice to Have]

Well, after solving this that door opened
http://steamcommunity.com/sharedfiles/filedetails/?id=1166372914
leading to another door needing a valve wheel to open
http://steamcommunity.com/sharedfiles/filedetails/?id=1166372983
and the only one available I seem to have already used here
http://steamcommunity.com/sharedfiles/filedetails/?id=1166373060

[oku]

there is a red valve around. Look in the bit of a storage area that is in one of the rooms near where you turned that outside valve for the water sensor puzzle.

[Nice to Have]

I apologize; yeah, there was a yellow valve wheel still lying on the flloor. I may have overlooked that, and the one in my 3rd screenshot had already been there.
This game can really be confusing!