Usually it is enough to know if it is above or below a soundlayer. Once the torpedo get's close enough the seeker has a wide enough sensor cone to detect anything from 0 to crushdepth. If the target is there, it will find it anyway. At launch the torpedo follows the launch depth of the submarine, or either the floor or ceiling depth if it is outside of it. Setting the torpedo search depth works to make it "pop-up" to search the other side of the layer when it enables.
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