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I'm a recently qualified sport diver so no expert but from my point of view, my left hand has got a good grip on the victim's BCD strap, my computer is on my right wrist where I can see it whilst operating the victim's inflator. Watching the victim is a secondary if not tertiary activity, I can do nothing for them underwater, the priority is to get them to the surface.
Originally Posted by Allan Carr
I would disagree watching the person is important. Twice I have carried out CBL's both times the diver was breathing just unresponsive in poor visibility I decided to lift rather than mess about on the bottom both of them came around after going up maybe 5 meters. By looking at their faces I could see they were safe to be released. If they had stopped breathing then the rate of ascent would have been increased drastically. I do not need to look at a computer to judge my speed.
Originally Posted by Moleshome
Totally agree! Face to face and watch the eyes... two real CBLs in 35 years ... neither unconscious but incapacitated and unable to manage their bouyancy adequately. Once control of situation was apparent to them the size of eyeballs in their mask reduced dramatically. I followed speed of small bubbles in both cases.. first was well before computer .. no alarms on a analog depth gauge!
Originally Posted by bottle maker
One thing I used to emphasis when teaching CBL in the past was dont piss about on the bottom. Try to dump any air on your own wing or BCD as you approach then get a firm grip the start inflating the casualty’s BCD and DONT STOP inflating until you are both moving .. then control ascent by dumping air and flaring fins. If either of you have a drysuit then try to remember to wind them fully open first too. Too often there was a lot of fannying about on bottom .. two squirts of air, wait, 2 more squirts, wait etc.. Keep inflating till you are both as ending helps avoid this.
Originally Posted by Steve C
Ooo no don't like that, don't piss about true, but don't like whacking a load of gas in.
Dump own gas, get in the propose position with casualty and push off from the bottom, then start fining.
Natural expansion takes over at about 2m and chances are if they are weighted right won't need to add
much, but if not, just add a squirt or two. By the time that's done they'll be at 4m+ and it's all expanding again.
This method is actually faster than using BC alone and a lot safer.
Drysuit gets taken care of by placing the casualties left hand on the rescuers shoulder and rescuer goes over
the top onto the inflator keeping arm in place. This means a cuff or shoulder dump is both at the highest point
and any venting can be easily seen or dealt with.
Good call on the drysuit but lots has to be right with your method of lifting for it to work or you find yourself finning hard and going nowhere .. and in limited vis perhaps not even realising. I preferred to know there is a positive ascent ... however I am not an active instructor so very possibly out of date with the current thinking. At the end of the day if shit happens what works works!
Originally Posted by Tel
Originally Posted by Steve C
All basic skills responses are based on the statistically most common of scenarios as a default.
Once that's established the skillset can be expanded to include much rarer and extreme scenarios.
To use an extreme scenario as the default can both increase the risk in the more common benign
environment and even in the act of training itself. It's also for this reason that a lot of older diving
skills are no longer taught.