Err... you were at 160m or or feet? And was a layer present? Because if you were below the layer then it would be perfectly ok for you to NOT hear those ships.
As for the torpedos ... I can't recall the mission right off the bat ... are you flying a P-3 or Helo (you said dropped)? And if you do, how deep is the water? Because it might be that you just buried your torps in the mud, either by dropping them from to high or by using the wrong settings.
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