I'm not sure if that's "high-realism"... But I'm trusting your judgement.
How close would that be? 1000 meters?
And how do you manage to attack convoys if you approach that much? Its too hard to scape. During the WW2 they would shoot at longer range, two eels for two targets, or sometimes 4 targets at once, between 2 and 4km away. I read about one attacking a destroyer about 6km away, and sunk it!
Its very hard to get at 800meters of the target without being spotted or heard... very stealthy movement, and not rushing anything...
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To each his own
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