[Trigger] How can I make linear fog appear for a player/in a region?

[Marine]

A certain region of my map is underwater; I'd like players who enter it to experience a bluish linear fog to enhance the effect. Is there any way for a trigger to do this?

Basically, I want a linear fog that appears for only ONE player.

(Players come and go from the region)

 

[defskull]

In the test map below, you will have 2 units that you can control (1 is your owning unit and the other is Player 2 unit)

If you order Player 2 to enter the Water Region, nothing happens to your computer but it does affect Player 2's computer

And if your unit enter that Water Region, your computer will have the Fog but other computer does not.