I have noticed more divers are borrowing another safety tip from tech divers and using necklaces to keep the alternate reg. close by. Does anyone use the necklaces just for their primary? So if they are on the surface and want to let the primary out of their mouth to talk or something else the primary is right there at their mouth to be quickly and easily put back in.
Just wanted to see what others may think or be doing.
Thanks.
Well by now you know that it's not a common practice!
You cite the advantage of it keeping your primary second stage close to your mouth for quick and easy retrieval. That sounds like a good deal.
What are the risks? The only real one I see is if an OOA diver comes at you in a panic and goes for your primary second (in your mouth and bungied to your neck) they will not have an easy time of it. So let's pick this apart a little more.....
Scenario 1 you are diving with a buddy or as a team at a site where encountering other divers underwater is unlikely. The pre-dive air share discussion should set the expectation that a buddy go for your alternate, the location of which you point out.
How often do you have an OOA diver come to you in distress? The nearly universal failure mode of regulators is to over deliver air. If the diver is in any sort of buddy formation there is ample time to get to your alternate. If he or she has emptied their cylinder by breathing it down to nothing then that's inexcusable to begin with. Tank valve partially open, I'll admit in a moment of distraction it can happen.
So there are remote possibilities and these are what you need to deal with. So they are in a panic and snatch your primary. Your goal was to have it hang below your chin for easy retrieval and necklaces do stretch. They may stuff it their mouth upside down and it may breathe a little wet but they will still get air to ease the crisis. Meanwhile you can retrieve your alternate for immediate use and when appropriate get them on the alternate to ascend. I will tell you hear and now that this will be easier than making a grab for a double hose regulator mouthpiece.
Senario 2.. If you are in a public dive boat setting or a busy shore dive site with many disassociated divers then the lone diver out of the blue is more of a possibility. And it will come down to how well you have trained to work with your configuration and how you manage the situation.
I would make the necklace (with surgical tubing) long enough to allow some flexibility. As with any "non long hose diver" you should be well practiced in deploying your alternate second.
All this being said inventions occur for reason and this may be a solution in search of a problem. The common regulator retrieval techniques seem to serve most of us quite well. If you are removing your regulator on a surface pause consider hanging it down your right shoulder instead of tossing it aside.
Pete