Even in the Stock game, you can be seen below the water surface, and the periscope being up will leave a wake trail - though that isn't actually what is spotted. There is a "size of" setting for your boat's surface area that controls that. There might be a negative underwater visibility incorporated into RSRDC also. In theory, your boat might be visible down to roughly 120 foot with that. An airplane has to fly over your position at a certain angle for you to be "seen" like that supposedly. If I am seriously into "stealth", I will cruise at 100 ft depth, and come up every little bit to PD and have a look-see, then go back down, with the sonar actually being my main target finder. Even if an airplane can see you down there, they generally cannot bomb you that deep. However, they might call in the cavalry, and you end up with any available DD in the area coming to look for you...
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