When you determine the DD is steaming away even if he is circling you. Go to flank and get above the thermal layer which may be about 150 feet or so. Then drop a volley of decoys and get below the thermal and steam about 3 knots away while ensuring you have silent running on. You should be able to slip away. The DD will focus on the decoys and once the decoys are dead you should be far enough away to just keep sailing until it is safe to surface again.
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"My Religion consists of a humble admiration of the illimitable superior spirit who reveals himself in the slight details we are able to perceive with our frail and feeble minds." Albert Einstein
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