Water in the LevelEditor

[Sovjet]

How do you make a layer water?
Like in Tau in the dive room when you open the door to the airlock, a layer water comes up.
When I make a liquid area I can't see the water but it does make the splash noise and effect when I jump, since I can't find the area in the tau map I have no clue how to make it like that.

Well i got the clue how but it wont work out for me either.

I will just wait a little time until tutorials come online.