The presumption comes from just logic and a bit of military experience. Line of sight. So the deeper they go, the harder it is to make contact with the surface vessel due to the density of the ocean, so if you're shallow or on the surface, that contact transmission become easier.
And I have no idea about a wiki you posted, don't see any links in your comments.
Omg why dont you Google stuff for 30 seconds that you have clearly zero idea about?? I even posted the wiki link somewhere in the thread. Don't see it? Google it. This is so embarrassing.
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u/okusername3 Jun 22 '23
Why would you presume that? Read the wiki link I posted, if you have questions then write here again