Something else I have noticed. The S boat DOES NOT have this capability, which is accurate. The Fleet boats had two sets, one below the water, when surfaced and one above. This was one of the many advantages fleet boats had. Before people say this or that is not right, look it up on the net, or better yet, look at some books on the subject. Hydrophones worked up to a speed of 10-11 kts on the surface, and on smooth seas. Any faster or rougher you needed an uber sound man.
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