Layer
Yet once I feel important to say that in DW, layer effects are quite weak. There has to be very specific conditions to see any effect at all. To 'loose contact' due to depth change is possible only on the border of detection range. You definitelly won't evade torpedo because of the layer. Being on the other side of the layer can delay detection and classification a bit, but again, it takes place only at the detection range border. When they shoot at you, you are much closer and layer can be ignored.
In DW much more important factor is surface noise. It masks contacts. For beter sonar reception go as deep as possible, especially with high seas. In most conditions deep sonobuoys gives better results than shallow ones. I think this is because of surface noise.
This is how it works in DW. I don't know how it works in real.
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