I have a feeling you are playing the '68 campaign? If that is the case there were very few submarines that could dive deeper than 700-800 feet, so most (if not all) weapons are fired shallow and the detection cone is only able to "see" to about that depth. Air dropped weapons though, will circle as they dive down (eg helicopter and MPA) and they do go deep.
If you are playing the '84 campaign, perhaps you have not come up against the newer submarines (eg ALFA, CHARLIE II, OSCAR), as they can and will fire multiple UGST and these weapons are comparable to the Mk48 ADCAP, and these will definitely "see" you at 1200'.
Surface vessels generally have the older weapons that have the limitation of not being able to detect at depth.
Not sure if this answers your question, and I may be wrong on some of these points... Always happy to hear from someone more knowledgeable than I am.
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