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Surface vessels do not leave a propeller wake. They leave a bow wake. Their propellers are under water. A modern sub with a stealth design prop has a portion of the prop above the water when running at or near the surface. Any flying craft does not leave any wake in the water, other than a sea plane which is not flying in the normal sense if it is in contact with the water. The witness stated that the wake was like foam which, to me, is an asymmetrical shape off to one dominant side. What other than a modern sub would do this? And why did you give an exact type of helicopter if you don't know?

And why did you give an exact type of helicopter if you don't know?

Oh, Sorry. I can't tell you that.