[quote=OneShot]
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... its something else to hear an airplane like a P-3 flying at 170kts and 300ft above the water ... while TAs might be quite sensitive I'm not sure if this would work in reality - tho I'd like to have someone prove me wrong (with facts).
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While I would love to provide you with facts, all I can provide is anecdotal evidence. I know back in the early 90's a sonarman told me they could hear a whale fart are a considerable distance. The fact that a plane makes a lot of noise (I grew up around P-3C's and other military planes) and that it would make a sound wave at the surface interface, I would not put it beyond the scope of reality.
Facts that told you that it was possible and just how sensitivity the sonar on a submarines is would EXTREMELY classified.