If you can, go just a bit below Periscope Depth and put the Speed on 1 knot. Then try your time compression. It might be that your boat's AI is picking up the contacts because you're at or near Periscope Depth. Don't go too deep in the Inland Sea though - you'll run aground. You'll still get interrupted by "Sonar Reports!" In stock game, the lighter the water color, the shallow the depth... how soon until it's night time and you can surface the boat?
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