-hh
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SeaJay once bubbled...
have found out in the first five finstrokes that chop or no chop... Swimming on your back in full scuba gear works a lot better than swimming face down - even if you have a snorkel.
It can depend. For example, I carry a pretty darn heavy camera system, and the "right place" generally to hold it is in front of me, at belly height. Rolling onto my back to swim isn't too bad with a Jacket style BC, but in a Back inflation type (BP/Wings, etc), it becomes a "topheavy" situation that simply doesn't work well when its rough. I relegate it for short duration, high exertion swims (such as getting away from waves breaking ashore).
This means that the rest of the time, I'm going to not be on my back, but in a position that needs an air supply system in my mouth, be it the reg or a snorkel.
I can assure you that every emergency situation I've ever been in like this has involved getting buoyant, leaning back in your gear and finning gently to shore.
Generally, the issue that I see with the proposal of using your reg instead of a snorkel is that your air supply is only going to last for a relatively short period of time. For a typical novice with SAC = 1ft^3, an AL80 with 500psi remaining will really only last 10 minutes, even if his SAC isn't in actuality a lot higher due to higher exertion levels.
The implication is that if you're on a drift with a chase diveboat, if they lose you due to degraded surface conditions, its not terribly unusual to spend 10-20 minutes on the surface before you're found and they pull up.
FWIW, within the past 12 months, I've probably had a half dozen dives that resulted in 10+minute surface drifts.
Even if the boat is only ~75yds away, they're not going to come speeding right to you: if they suspect other divers doing stops that might surface at any time, they'll either heave to and wait for everyone to come up, or come in very slowly. This can result in 5 minutes as a cork very easily.
Even if we say they arrive within 2-3 minutes, since it generally takes ~2 minutes for each diver to get onboard a small boat in rougher conditions, this means that the last guy in a sixpack can be expected to be in the water for 10+ minutes before its his turn. If he's on his regulator, that's an easy 500psi worth of air.
You know, I'd have had more respect for the answer, "I just like snorkels," or, "I'm worried that this might happen..."
Personally, I always dive with a snorkel. Been doing it that way for the past three decades, and the more advanced/remote the location, the more necessary IMO it is to have a snorkel.
My decision on if to switch to it on the surface depends on how soon (or not) pickup is going to be: if it looks like its not going to be immediate, I'll switch over to snorkel to conserve tank air.
Reason for this is because a DiveAlert horn is the best tool to signal a diveboat far away, and they don't work without an air supply. When you're diving off of Wolf or Darwin in the Galapagos, if your ship issued you an EPRIB, policy is that you don't even activate it until you've been drifting for a half hour. That means I'll be using the Horn for 29 minutes to help the zodiak fix our position, as the current will move us along nearly a mile in that period of time.
And for the entangler complainers: if it gets in your way, you either have the wrong $20 snorkel, or you rigged it wrong.
Finally, I've only had to rescue one diver so far this year, and the reason was they had drained their tank empty and then couldn't deploy their snorkel from their BC pocket to cope well with the short chop that we were in, and their abilty to "roll back" was compromised by the presence of a back inflation (Ladyhawk) BC.
The lesson here is that if you're going to stuff your snorkel, make sure that you can redeploy it in the water while carrying whatever you normally carry (in this case, they had an UW camera).
-hh