Well, you may have gotten unlucky in getting dealt with veteran crew aboard the escorts. They do indeed have better detection capabilities. Which might seem like a 6th sense.
I'm not clear on if you waited submerged or on the surface. Also you say you were pointed 90 degrees to the convoy's track at about 3km distance, and that you showed minimal aspect of your boat. But if you have a flanking escort approach you from your side he has a good perpendicular aspect on your hull, giving a nice active sonar echo. Can you clarify the situation more clearly?
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