I assume you mean that you want more pitch and roll.
For that you need to change the values for your self.
You need a nifty little program called S3D Editor.
Download and install the program.
Start the program and select to open a file. Locate where you have Silenthunter4/Data/Submarine/Nss_gato and open the file Nss_Gato.sim file.
(You can do this for any sub in the Submarine directory. Its the .sim file you sould aim for)
When the file is loaded into the editor you will se some nodes like:
10:unit_submarine and click the little arrow and you will se
11:unit_submarine poping up ( click on this name) and you will get some "info" to the right that is called property tree.
Click the arrow there and navigate down to obj_hydro.
The full path i the property tree are: Unit_submarine/ Unit_ship/Obj_hydro.
There you should se a value called gc_height=2.50 ( or whatever it could be for value)
That value means Gravity center height and if you increase that value abit you raise the gravity center of the submarine and it will roll more.
Clcik the value and type in the new value in the bottom box and dont forget to save the file so it will take effect.
Start the game and get ready to puke as you get seasick
Note. Dont raise the value to much. Increase it max in steps of 0.2.
If you get to high value the submarine will flip and turn upside down.
Even if the sub goes nice on the surface it can flip upside down when you dive.
So test and do small changes untill you find something you are satisfied whit.
There are other values that also affect the pitch and roll but this is the most easiest value to change for an high effect.
I have upped my Gato value to 3.52 and that is enough for me to get seasick from
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