now youre getting into some possibly classified stuff. Some sources i've seen give the 688i class a hull/flank array of some kind. (I cant quote them im at work) the 688i is known to carry the MIDAS HF under-ice imaging sonar. pretty much every submarine which operates under the ice needs some form of remote-sensing/imaging. this usually comes in the form of an HF sonar. Theres some speculation about Russian boats like Victor and Akula class (and probably delta, typhoon and borei as well) which may have HF sonar or some sort of LLTV (low light television) or both.
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