Explain for me, if you will, the physics that allows sound to reach a submarine under several layers yet the sound it produces can't be detected? After you've done that, pse explain where, exactly, these "several layers" exist
I sense I'm walking into something here! The Kilo hovering at 500 feet makes very little sound, to the surface craft it is essentially silent. But the Kilo can hear the surface craft, unless the surface craft is stationary. I would think that a USN carrier makes lots of noise, I also doubt if it would sit dead in the water listening for submarines. Can the Kilo hover at 500 feet in the Strait? No, too shallow, as is the Persian Gulf. But the Kilo can hover at 500 feet in the Gulf of Oman. Saline layers reduce the effectiveness of active sonar. Is there a saline gradient from sea level to 85 fathoms in the Gulf of Oman, I should think so, the stuff pours out of the Persian Gulf. Is the gradient constant? Unlikely where bodies of water meet.