Is the question here HOW do you ask a question? Or is it how do I articulate a question underwater?
They both start the same. First off, you need to get your buddy's attention. To do this, don't ever, ever, ever tug on a fin to get their attention. Never. Of course, your buddy is a kick away, right?
You have options to get their attention:
1) Move your light slowly into their field of vision and pan is slowly. They'll look at you.
2) Shine your light onto their hands. That should do if they can't see the light pan.
3) Shine your light onto their cheek. It will light up their mask without blinding them. They'll look at you.
If that doesn't work (or if you have no light) place your hand lightly on their calf. They'll turn and you can fire off the question. Do NOT pull on their fin.
With their complete attention, simply ask the question.
Apart from the obvious ones that we all have signals for:
* You OK? (OK sign)
* How Much Gas you Got Left? - I will always look at the gauge when I'm not with a regular buddy (Palm up, point to it with other hand)
* Where's the Boat? (hands cupped in Hull shape, shrugged shoulder)
* Are you Cold? (Burrrrrrr)
* I gotta Pee (uh, you know that one...)
* Turn Around (fickle finger of fate - index finger spin)
* Stick together / get closer (index fingers from each hand pointing forward, close together)
etc, etc, etc...
Most of these are hashed out on the way to the site or on the boat ride over. The 4 or 5 essentials can be confirmed with an insta buddy in the 60 seconds before you drop.
Are you looking for a conversation? There isn't much signing underwater. If its not on the short list of 6 or 7 basic questions, break out the Wet Notes. They're the best
$16 investment you'll ever make in your diving.
No more "huh?"... When in doubt, write it out. If you have something to say, write it down.
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Ken