So in my game I have a pirate ship with a below deck area that the player can explore. With the standard water (or any other water I have found so far) it just acts as an animated plane. Meaning that the part of the ship that is supposed to be underwater will look covered by this water.
Now, I realize that fluid simulations are unrealistic to some extent, but is there any good way of having a boat with a below deck area move through water?