Single Cylinder Divers | Wetsuit – 8.5 min

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00:00 Watch Our Correct Weighting Videos First
00:15 Overview Of Our BCD Failure Exercise
00:50 What The General Dive Industry Want You To Believe
01:13 This Is What Correct Weighting Is
02:06 Lung Capacity Testing
03:25 Test To Prove I am Correctly Weighted
04:26 We Simulate A BCD Failure At 25 metres
07:00 Extract From End Of Dive Weight Check Video
07:33 Common Problems That Many Scuba Divers Have

8 Comments on “Single Cylinder Divers | Wetsuit – 8.5 min”

  1. Colin Schneider

    Steve, While diving I normally take in deep/ slow breaths. Breathing to about 90 percent lung capacity each time, then fully exhaling. Is this recommended/ do you have any suggestion? I find my buoyancy is pretty good but I’m always open to suggestions and improvements.

    1. Steve Martin

      Hi Colin, good question. I do explain this in of the 165 videos I released don’t ask me which ones exactly 😉 With breathing, think about how you breath on land during normal activity this is how it should be underwater really after all what is the difference. Being able to utilise the full volume of your lungs to move up or down in the water column when you want is a skill you should develop, see my advanced buoyancy control videos on that. If a diver is breathing in 90% and then exhaling out fully, this is not necessarily good breathing and depending on how quickly a diver does that, it is just wasting gas or even hyperventilating. When divers are first learning my quick guide is 4 seconds inhale, pause for a few seconds, then breath out the same 4 to 5 seconds, when you normally exhale you will still have approx 20% air in lungs, just breath again when needed, can be 4 to 10 seconds later depending on fitness level of diver. My videos explain all this. Cheers, Steve

  2. Ted Reitsma

    I saw a TDI story of one diver using what I think he called a 7-13-20 rule. This kept him alive conserving air, hoping a silt out would resolve so he could get out of a mess he should not have gotten into in the first place. I modified it just slightly. Inhale for 7 seconds, hold for 7 seconds, then exhale for 7 seconds. This is not hard to do at all and basically maximizes the oxygen exchange going on as it is basically a full breath. The end result is just 3 breaths a minute. I suspect it also lowers heart rate (dive reflex), but I have not been able to check this out. I would mention you should NOT do this for ascents, it is for just stationary or horizontal travel and will improve your SAC. The problem is you need to think about this a bit (task loading). I think most experienced divers with good SAC rates are basically subconsciously doing this or a variant of this. it is not skip breathing.

  3. Matti Hämäläinen

    Some Custou stuff 🙂 this is actually really important in overhead enviroment. There was a diving accident in Finland in an overhead enviroment. The team was serious trouble because the amount of gas was not compensated with weights. This was in a cave system, but the lesson learned was that you would always have enough kilos to compansate the gas you have in your cylinders. In all your cylinders.

  4. Neville Douglas

    Thanks for the detail Steve, me and my partner completed the task in regard to the correct weighting, I then did the buoyancy check at the end of the dive, 5 meters as suggested and, made it to the surface and out, using the technique you have so eloquently demonstrated. On the surface another diver came up to me and asked I I managed to get to the surface, by the way we were at Capenwray, he said he saw me dump most of my air out of my cylinder and my BCD as he was doing his safety stop and saw me, I commented that I learned this from your site, and so was practising, he asked me how much weight I was carrying as I had a thick undergarment on and a dry suit, I said just the weight of the back place in the Zen delux its 3.5 kg, I then showed him my SPG it had 50 bar in and he said that he could not go down unless he had 10-12 kg on him as he was floaty and so what I had done would not work for him, my only comment was may you always continue to be floaty. thank for a great tip.

    1. Steve Martin

      Your very welcome Neville and thank you for feedback. Hopefully that guy went on to buy this video series so he too can learn to get the weight off 🙂 Keep me updated on your progress please, really like to hear about it. Cheers, Steve

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