The only way to know for certain is when he starts dropping depth charges. If I hear a destroyer's propellors closing I assume he has me and go to flank speed, full rudder one way or the other (if he's off to one side I turn toward him in the assumption that this will throw his aim off) and dive another 50 feet or so.
I've never paid attention to the frequency or the volume of his pings. I just naturally assume that the game has it wrong.
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“Never do anything you can't take back.”
—Rocky Russo
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