Logically being close to any surface ship SHOULD mask your sub, but I'm fairly sure the game doesn't simulate that. I've seen cases where a DD is making a beeline towards me when I'm running quiet at periscope depth with a cruiser between me and the escort, and with either active or passive sonar he should NOT be able to either hear me over the noise from the cruiser or get an echo off me with the cruiser's hull between us. They do anyway, mainly because the AI cheats. The game controls the AI, the game always knows exactly where you are, simplest programming is for the game to feed your location to the enemy AI, so that's what it does. That's my theory, sloppy lazy programming, never been able to prove it with 100% certainty though. Decoys work more often than not, with the 30 minute decoys I've seen several different escorts making multiple attack runs on the decoys.
When all else fails, down the throat shots at 500-700 yards usually work, provided you make sure you're at or near a zero gyro angle so the torpedo doesn't need to make a turn.
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