Conscientious, contact-free diving means diving in control at all times. You should constantly be aware of where you are in the water column. If your buoyancy is under control you won’t unconsciously float up or sink — or if you do, you’ll immediately recognize the situation and correct it.

Good buoyancy control alone is not enough, however, to guarantee that you’ll avoid accidental contacts while underwater. You also need to develop awareness of where your entire body is in relation to surrounding objects. This is especially important when night div­ing and maneuvering in confined spaces such as wrecks.

It’s easy to fall into the trap of think­ing that where your head goes, so goes the rest of your body. We secure our hoses and accessory gear so they won’t hit anything, but often pay little atten­tion to where our fins are as they flutter along behind us.

One of the ways to prevent fin con­tact is to move slowly and gently. Envi­sion yourself as part of a delicate ballet, a troupe of dancers gracefully executing precision movements to the rhythm of the flowing waters. This metaphor works for me, anyway; you can create your own vision to help you blend har­moniously with whatever underwater environment you’re exploring.

When you are a guest in somebody else’s home (in this case whatever aquatic creatures live where you’re div­ing) you do your best to fit in and to avoid disturbing or damaging it. Moving slowly and carefully through the water column allows you time to develop continual awareness of every part of your body. For instance, you’re swimming along, approaching a bottom feature protruding from the substrate (e.g., piece of a wreck, sea fan, giant anemone). Consider in ad­vance how you will clear it and by how much. “Shall I go over or around? Am I horizontal or are my legs lower than my torso? I have 6 inches vertical clearance, is that enough for my kick to clear’?”

If you conclude that you might not entirely miss the object, you have choices. One is to change course and kick around it, if possible. This option keeps you at the same depth and lets you view the feature from the side rather than the top. Alternatively, if the feature is large you can kick upward and pass well over it, adjusting your buoyancy as necessary.

Another option, if you’re near the top of the object, is to simply inhale deeper and glide over it. This is the most re­laxed response, involving no noticeable body movement, but requiring an awareness of how your personal buoyancy is affected by your breathing pattern. Still another choice is to change your kicking style to one that will avoid con­tact. In Open Water class we’re taught to use the flutter kick as our standard means of propulsion. It works well for covering distance, but for moving slowly or in close quarters other styles are preferable.

One of my favorites when I want to swim near the bottom without disturb­ing it is the side kick. This is basically a flutter or scissors kick performed side­ways — the stroke is parallel with the bottom instead of toward it. Twist your body at the waist so you are still facing forward, but your hips are rotated 90 degrees. Since the fin strokes push the water sideways rather than down, little turbulence reaches the bottom and the chances of contacting it are minimal. A Variation on this is the bent-knee flutter used by cave divers. This does not mean bicycling. The body stays in a straight line from head to knees (i.e., don’t bend at the waist). The kick is from the knees and the down­ward stroke stops with straight legs and the body aligned, rather than con­tinuing downward.

The frog kick is another option. The knees are brought forward and out to the side with the ankles bent so the fins stick out, like a frog. Then the knees are quickly straightened and the toes are pointed, so the legs snap to­gether (watch a frog for the best demonstration). Again, the force of this kicking method is toward the back rather than up and down, so it can be used near the bottom.

The amount of propulsion from the frog kick depends on how far apart the knees are extended and how fast the legs are brought together It is a good al­ternative for gliding slowly around a site as well as for maneuvering through a tight swim-through.

The ability of light to pass through water (and our ability to see clearly) is also influenced by its turbidity. Turbidity is influenced by many factors but they can be grouped into two large classes, things suspended in the water and things dissolved in the water. Suspended things include silt, plankton, etc. while dissolved things include salt and chemicals. When a diver is swimming along near the bottom, the water movement caused by their fins often stirs up the silt and for a while the water behind them has high turbidity this often results in death when open water divers enter caves. The water is crystal clear in front of them and they do not realize until they turn around that they have been kicking up the silt and they can no longer see the way out of the cave.

If the water is still, the silt will eventually settle back down to the bottom and the water will become clear once again. The time this process takes depends upon the size of the silt particles. Grains of sand will settle in a minute or two while the ultra fine grains of rock flour produced by a glacier will take several weeks to completely settle out. During a cave diving trip under the Columbia Ice fields in 1987 the water was ‘air clear’ when we arrived at the dive site. After we had made the area safe and several hundred (or thousand) kilograms (pounds) of mud and rocks had been dropped into the water, the visibility was less than 2.5 cm (I inch)! We went back to the surface and returned to the dive site two days later. The silt was so fine (glacial flour) that even though the water was absolutely still, the visibility had only improved to 30 cm (12 inches).

Salt water has large quantities of salt and other chemicals dissolved in it and for this reason, can never he as clear as fresh water. The best clarity to be found in the ocean would be around 60 meters (200 feet) while in some fresh water caves the water is so clear it cannot be seen, visibility is over 300 meters (1,000 feet). These ideal conditions are rarely encountered and we usually have much less visibility. For example, the Ottawa River contains water with many dissolved chemicals (from soil, trees, etc.) and visibility is seldom more than 6 meters (20 feet). The St. Lawrence River used to be similar but the infestation of billions of zebra mussels has changed this situation drastically. Zebra mussels are filter feeders and each mussel filters the silt and chemicals out of a large amount of water every day. The result is that places where 6 meters (20 feet) visibility used to be considered good now frequently have 30 meters (100 feet) visibility or snore. The problem is, now that the water is clear enough for divers to see well, the wrecks still can’t be seen because they are now covered in many layers of zebra mussels!

Before each dive, work with your stu­dents to closely examine the objects of their fear, help them rationally weigh the risks, and then develop a sound procedure to control the perceived risk or danger. By teaching our students to perform such an analysis, the stresses associated with common fears and concerns can be relieved.

The Cycle of Stress and Panic

It’s important for our students to un­derstand how too much stress can lead to panic. As part of the discussion, we can review how an accumulation of stressed causes an increase in heart rate, as well as rapid shallow breath­ing, the result being a buildup of CO2. Especially when breathing through a regulator, a diver can experience a real or perceived inability to breathe, or in­crease in breathing resistance, that heightens the stress and leads to panic. Oftentimes, a panicked diver will remove his regulator or mask, causing a more dire situation. When a diver un­derstands this cycle, he is better pre­pared to deal with stress, and may be more likely to take steps necessary to alleviate common stressed.

The Signs of Stress

The closer we get to the water, the more important it is to carefully moni­tor stress levels, so part of our efforts in teaching about stress must focus on identifying the signs of stress, and tak­ing actions to alleviate it.

A variety of subtle and not-so-subtle signs can let us know when a diver is experiencing elevated stress levels, and we should review these with our stu­dents both in class and as we prepare for an in-water exercise. Before a dive, we might see changes in personality. While one diver might become “dis­tant” or preoccupied, another might become giddy or start laying on the one-liners. A diver who becomes for­getful or who has problems assembling his gear, or who becomes angry or frustrated may also be experiencing el­evated stress levels.

Physiological stress can also be building in the pre-dive period. A fully suited diver sitting in the sun may be overheating. A diver who becomes overly quiet and looks pale could be experiencing the onset of seasickness. Remind your students that physiologi­cal stress can add to or heighten the psychological stress of a dive.

Once in the water, a number of signs may become apparent in divers who are becoming stressed. Our students should know to look for wide eyes, a high breathing rate, and flailing of the arms that signal a diver’s stress level is high or on the rise. A diver who “freezes” to the boarding ladder or down-line might also be experiencing high stress levels. When a diver is fum­bling with equipment underwater, or appears to be having some form of equipment problem, chances are his stress level is rising.

Just Relax

The time to be thinking about stress is long before it becomes a problem. One technique that can help students be on the lookout for stress is to in­struct them to take notes (mental or written) regarding the signs of stress they see in themselves and others be­fore, during and following a pool ses­sion or open-water training event.

When students are tuned in to looking for these signs, they are more likely to identify them. Follow-up after the pool or open-water training will help rein­force what they have learned, and help them develop better strategies and techniques for avoiding stress.

While we can always tell our stu­dents to just relax and enjoy the dive, several steps and procedures are more likely to help a diver relax before a dive. One key to maintaining confi­dence and alleviating stress is to re­view the plan for the dive, the normal and emergency procedure to be used, and underwater hand signs for the dive. Reviewing these items will help the diver develop a confident frame of mind and become mentally prepared for the challenges ahead.

Only after attending to proper weight­ing and trim can you expect to achieve consistent control over your buoyancy. Given a typical profile of descending to a certain depth and remaining at or near- that depth for the majority of the dive, the ideal is to establish neutral buoyancy by adding air to the BC, if necessary, and then not touching the inflator again until you are ready to surface.

Minor variations in depth are accom­plished by using the lungs to alter buoy­ancy — breathing slightly more deeply to swim over an object and exhaling more deeply to sink hack down. Larger changes in direction and body position are handled primarily by the fins. After awhile this technique becomes second nature, however, specific exercises can help develop this skill most effectively.

A simple exercise used for testing your weighting, the fin pivot, is also valuable to increase awareness of the ef­fects breathing has on buoyancy. To work best, the fin pivot should be per­formed in a pool or confined water that is not subject to water movement.

Lie facedown on the bottom with no air in your BC. Add air with short spurts of your power inflator until your upper body just begins to rise but your fins remain on the bottom. From this neutral buoyancy position inhale and exhale more deeply than normal. Notice how far your body pivots up and down.

Pay particular attention to the de­layed reaction between breathing and body movement. When applied, this knowledge can make all the difference between bumping into an underwater feature and gently gliding over it.

Aside from understanding, the role of breathing in mastering buoyancy skills, another crucial aspect is to reduce body movements to a minimum. With proper weighting and trim it is possible to maintain a horizontal body position without using the hands or kicking. Practice minimal body movement by hovering. Try to remain at a constant depth for several minutes without mov­ing. At a given depth, fold your arms across your chest, cross your ankles and gradually add air to your BC until you become neutral. Your depth should vary only slightly with each breath: be prepared to compensate by breathing shallower or deeper if you begin to float up or sink.

Practice hovering horizontally and vertically. The ultimate test of your hov­ering ability is the “Buddha” position — legs crossed in a sitting position, hands grasping the tips of the fins. If you can sustain this hover without turn­ing over forward or backward, you’ll know that not only do you have good buoyancy skills, but also your weighting and trim are well-adjusted.

A final test of buoyancy skills is to suc­cessfully maneuver a buoyancy practice course. These consist of a series of geo­metric shapes, such as a diamond and a circle, made of PVC pipe. Typically they are anchored above the bottom at various depths. The objective is to swim through each shape without touching the frame. Perfecting buoyancy control is largely a matter of repetitive practice. But you can he certain of using- the proper techniques and practicing in a safe environment by enrolling in a buoyancy specialty class.