Actually its not the subnet that makes the noise, we always thought it was, bt its not. Its the actual PORT being spawned/rendered and as it does so it makes that horrible sound. It is the sound files listed above but why the hell it uses them as the Ports rendered I have no bloody idea. The only thing that springs to mind is a possible collision with the net as the harbour walls get rendered and pass through the net!
You can see this for your self in campain mode. Next time you load a game, enable the free camera. When your about 20-25Km away from a port on the map, take your camera over to the Port. When you get there you will find no port rendered. If you take the camera under water you will see that the sub net is there! As your sub closes on the port it will be suddenly rendered and as it does so that horrible noise will be heard.
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