Basically a chemical bubble releaser, the decoy released a large amount of bubbles. Wasn't really the noise as I understand as the large layers of bubbles that caused sonar reflection, thus appeared to be an object there.
Obviously best used when you're in trouble and under attack by escorts. If several escorts are headed my way I'll drop one above the thermal layer and head deep and haul arse. When they get rather close, 2000 yards or so I'll go silent. I'll then make slow turns keeping a narrow profile.
Then just use to as needed.
I think they're available in stock from the start. Mods like TMO you only get them when they become historically available late war, so I seldom ever get them.
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