I always run on continuous ping. The thermoclines don't seem to be reflecting the signal as they should, so I don't see any reason not to do it. After all, at 10+ knots while that shallow, you're going to be cavitating like crazy, to say nothing of the large mast and sail you're dragging through the water, so the sub is going to know that you're there anyway.
Clearly, DARPA does not specialize in subtlety.
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