I think I may heave read you were in shallow waters. Towed array can bottom out and be useless for you in these situations. If you are sure you are dealing with a hostile but cannot classify it, then just send a couple of snapshots his way. That will do the trick if you need to take em out.
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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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