ArmA has been missing the feature of flowing water sources and sub-terrain mapping. Being able to have tunnels and caves in ArmA 3 would be amazing as well as add to the overall beauty and aesthetics of the game as well as the tactical aspects. With the PhysX engine now working in ArmA 3, why not show the water physix that can be done in ArmA 3? What is really stopping us from having a stream running down a mountain from a cave at the top with a spring in it that connects it to the ocean water table? Or having a vehicle drive across a stream and have the tires kick up water splashing as it passes.