[propbeanie]

Yes, the mines and nets are at either end. I don't think there is anything like that in the middle. If you're at 100 though, and the mine is at 15, you could hear the "chain" rattle as you catch it, then the "boom!" as the mine gets close. One thing we've discovered in FotRSU is that the anti-sub nets do not render correctly, and that you will hear their sound at approximately the 20km distance, though I don't think you take damage from them there... Are you sure you didn't get bombed? If you've got a save with replay, look again from a different angle. The game doesn't always "draw" things the same way twice in the replay files...