Scuba Buoyancy Control for Divers
Effective scuba buoyancy control is, without a doubt, the most important attribute that a diver needs to develop.
Control of your buoyancy has a direct impact on air consumption, comfort, relaxation and the control of descents and ascents – which have direct safety implications.
Whilst typical entry-level scuba courses teach divers to perform skills from a kneeling, static position; upon graduation, we are extremely unlikely to find that we have to deal with any real problem which occurs whilst kneeling.
True proficiency in a skill, such as mask-clearing, can never be attained whilst kneeling; as the demands of real diving require the ability to utilize skills in mid-water. This, in turn, requires the diver to be able to instantly achieve and maintain neutral buoyancy in the water column
To implement skills safely requires the diver to remain neutral and still in the water column. This sounds simple, doesn’t it? But how static in the water is enough?
The required level of precision in scuba buoyancy control, of course, varies with the demands of the dive undertaken.
Technical decompression diving requires absolutely precise buoyancy control due to the tolerances involved in using rich oxygen mixtures at specific operating depths, close to their toxicity threshold.
Consequently, technical diving requires perfected scuba buoyancy control from the outset. However, even for the recreational diver; personal and buddy safety, breathing efficiency and marine conservation considerations all benefit from the development of buoyancy control.
It should be considered as the primary platform upon which all diving skills are built and a responsible diver should aim for as much control as possible.
To quickly assess your scuba buoyancy control, descend slowly whilst adding air to the BCD where necessary and aim to remain neutral throughout the descent. A newly qualified recreational diver should be able to descend, stop and hover within 3 meters of the bottom without disturbing silt.
During the course of a dive, they should also be able to quickly achieve buoyancy to float statically in the water column for short intervals without having to fin, use hand movement or add/remove gas to maintain position.
A more advanced diver should be able to exercise far greater control than this. For some demanding dives, such as wreck penetration in very silty environments, a tolerance of less than 50cm of vertical movement may still be considered excessive.
A detailed list of buoyancy assessment standards is contained in a later article.
If a diver is compensating for a lack of effective scuba buoyancy control by the use of fining, hand-sculling or inflating/deflating their BCD, then they will be unlikely to maintain a set depth if they become otherwise task-loaded.
A small distraction (such as a flooded mask, or ear equalization problem) can lead to them unintentionally beginning an uncontrolled ascent or descent. The same is true if the diver is compensating for bad buoyancy control through extended shallow/deep breathing.
Scuba Buoyancy Masterclass – Article 1of9
The benefits of improving scuba buoyancy control & how it can be developed in training & practice.
What are the buoyancy control benefits for scuba divers? The reasons why it is worth devoting time & effort to developing core diving skillset
This is how you achieve great buoyancy control when scuba diving. There are a few key things to know, then you will find it easy
How to perfect your scuba weighting. Get this right & your buoyancy control will be much easier. Advice not taught in Open Water courses
Stable diver trim is the foundation for good buoyancy control and efficient propulsion. It also helps conserve the marine environment.
How to control your breathing & scuba buoyancy for more comfort, confidence and competency as a scuba diver.
How to improve your diving ascents & descents for safer and more comfortable scuba dives. This article can change your diving.
The balanced rig principle for diving describes a calculated approach to the amount of weight which can be jettisoned in an emergency
The benefits of streamlined dive gear and how to achieve it with your own scuba diving equipment. Small kit changes can have big effects.
About the Author
Andy Davis is a RAID, PADI TecRec, ANDI, BSAC and SSI-qualified independent technical diving instructor who specializes in teaching sidemount, trimix and advanced wreck diving courses.
Currently residing in Subic Bay, Philippines; he has amassed more than 10,000 open circuit and CCR dives over 27 years of diving across the globe.
He has published numerous diving magazine articles, designed courses for dive training agencies and tests/reviews dive gear for scuba equipment manufacturers. He is currently writing a series of advanced diving books and creating a range of tech diving clothing and accessories.
Prior to becoming a professional technical diving educator in 2006, Andy was a commissioned officer in the Royal Air Force and has served in Iraq, Afghanistan, Belize and Cyprus.
Originally posted 2011-05-29 20:34:23.