I'm really not worried about running out of gas. I do think about clogged dip tubes, which instantly shut off your supply, and I worry about freeflows, because I have had a bad one. I have done the experiment of exhaling, pretending I'm out of gas, and swimming to an otherwise distracted buddy, and I found that 25 feet is as far as I EVER want to be from my spare gas. So 25 feet is the MAXIMUM I'll get from my buddy, and that is only in calm water with superb visibility. If the water is moving, it gets harder to reach that breathing supply, and if the viz is low, 25 feet might be quite enough to lose one's companion completely.
But I never, ever, ever dive as a loosely constructed group of 12, and the reason why? Go read accident reports. "The group surfaced, and noticed that 'Bob' was missing." I want ONE person (or two) who are committed to keeping track of ME, and who will notice if I am behaving erratically or appear impaired in any way. If we dive as a group, we divide into primary groups of two or three, and although we may execute the entire dive together, if someone needs to abort, not EVERYONE has to go back, nor does the person with a problem ever have to return alone.
If you were in front of me, you'd be getting an awful lot of "Slow DOWN" signals!
But I never, ever, ever dive as a loosely constructed group of 12, and the reason why? Go read accident reports. "The group surfaced, and noticed that 'Bob' was missing." I want ONE person (or two) who are committed to keeping track of ME, and who will notice if I am behaving erratically or appear impaired in any way. If we dive as a group, we divide into primary groups of two or three, and although we may execute the entire dive together, if someone needs to abort, not EVERYONE has to go back, nor does the person with a problem ever have to return alone.
When I'm leading the way out, I'm usually as much as 20' away.
If you were in front of me, you'd be getting an awful lot of "Slow DOWN" signals!