Top screening is ineffective, however masking is nicely implemented by SCS and can be used in shallow waters. Depending on own depth, the SA may not pick up target sub running at or near peri depth on the opposite side of a surf. However if you can dive and/or deploy enough TA those faint tonals manifest.
Masking is difficult to pull off and would I'm sure only be used by a diver in extremis and in most cases would not inhibit a skillful opponent.
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