I too am wondering this same thing. Trying to infiltrate a convoy is a nightmare. I put myself in their path, submerge way before visual range, I don't send any radio transmissions before contact. Down to 150+ meters with everything off, dead stop, manual steering, gyro off, pump off, compressor off, vent off, blue light on, and everyone except the hydo man in bed, and still they come right for me as if I was sitting out in the open on the surface. What gives, do they randomly ping sonar? There is no way they are expecting/suspecting me to be there. No ships were behaving like they thought I was there (no zig zagging, no speed changes etc.), up until the lead escorts magically divined not only my presence but my exact location. Makes no sense.
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