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Yes....//... I think underwater discussion should be kept to a comfortable minimum ...
Only need single hand signals, more than enough of them. We are talking about single channel communication. Talking or listening, can't do both effectively at the same time....//... I am a big fan of one hand signals. My second hand almost always has something else to do, so I'm glad when I meet another diver with one hand signals.
The whole single-channel communications problem was solved years ago.
Everyone is a listener. A 'talker' asserts him/herself with an 'attention' signal. Talker then transmits message and falls off-line back to listener status. Another 'talker' asserts. Answers message and immediately falls off-line as a listener.
The problem is that the needy diver often assumes that control of the line is always his/hers. This needs to be hammered out topside.