Good buoyancy control makes scuba diving feel calmer, easier and more enjoyable. Instead of repeatedly rising and sinking, a well-balanced diver can maintain depth, move efficiently and concentrate on the reef rather than constantly correcting position. Buoyancy is not a skill that most people perfect in a single course. It develops through correct weighting, an understanding of equipment, relaxed breathing and deliberate practice. The following tips can help you identify the changes that make the greatest difference. What is neutral buoyancy? A neutrally buoyant diver neither sinks nor floats when holding a normal position in the water. Small movements and normal breathing still cause gentle changes, but the diver remains broadly balanced without relying on the seabed, a reef or constant fin movement. The goal is not to become completely motionless in every situation. Currents, depth changes, equipment and breathing all affect buoyancy. The aim is to make controlled, predictable adjustments rather than large reactive ones. 1. Begin with the correct amount of weight Excess weight is one of the most common obstacles to good buoyancy. An overweighted diver must add more air to the BCD, creating a larger air space that shifts as body position changes. This can make depth control less stable. Too little weight is also a problem, particularly near the end of a dive when the cylinder is lighter. A proper buoyancy check should account for your equipment, exposure protection, cylinder type and remaining gas. Do not copy another diver’s weight simply because they look similar. Body composition, wetsuit thickness, cylinder material and personal equipment can all change the result. 2. Make small BCD adjustments Large bursts of air often produce delayed overcorrections. Add or release air in short, controlled amounts, then pause long enough to observe the effect. Remember that air inside a BCD changes volume as depth changes. During descent, it compresses and you may become more negatively buoyant. During ascent, it expands and must be managed before the ascent accelerates. Anticipation is more effective than reacting late. Begin making small adjustments as conditions change rather than waiting until you are moving rapidly. 3. Use your breathing for fine control Your lungs create small, temporary buoyancy changes. A normal inhalation may cause a gentle rise, while a normal exhalation may cause a gentle fall. This is useful for fine adjustments around an obstacle or while hovering. Breathing should remain continuous and relaxed. Do not hold your breath as a buoyancy technique. Breath-holding is unsafe during scuba diving and indicates that weighting or BCD control needs attention. 4. Improve your trim Trim describes your body position in the water. Many divers aim for a balanced, roughly horizontal position because it reduces drag and helps fin movements send water behind the diver rather than downward into the reef or seabed. If your feet constantly sink, the solution may involve more than adding air. Consider: The position of weights The height of the cylinder The weight of your fins Whether you are lifting your head excessively How equipment is distributed across your body Ask an instructor or experienced buddy to observe you from the side. A short video can also reveal posture and equipment issues that are difficult to feel underwater. 5. Stop using your hands to stay in place Sculling with the hands can hide a buoyancy problem. When you stop moving your hands, you may discover that you are slowly sinking, rising or rolling. Keep your arms relaxed and streamlined unless they are needed for a task or communication. This allows you to identify whether your weighting, trim and breathing are genuinely keeping you stable. 6. Practise hovering with a clear reference Choose a safe area away from fragile marine life and use a fixed visual reference without touching it. Try to maintain a consistent distance while breathing normally. Horizontal trim A relaxed seated position During a safety stop While making a slow turn The purpose is control, not competition. Short, repeated practice is more useful than becoming frustrated while trying to achieve a perfect hover immediately. 7. Adjust for changes in depth early Buoyancy changes are more noticeable when moving vertically. Watch your depth and surroundings rather than waiting to feel that you are rising or sinking quickly. When ascending, release expanding gas early and maintain control. When descending, add only enough air to slow the descent and establish balance at the new depth. 8. Streamline your equipment Dangling gauges, alternate air sources and accessories create drag and can damage the environment. Secure equipment close enough to remain streamlined while keeping it accessible for its intended purpose. Streamlining reduces effort and helps you maintain a stable position. It also protects hoses and accessories from becoming caught or contacting the reef. 9. Slow down and reduce unnecessary movement Fast finning and constant direction changes make it difficult to judge buoyancy. Pause, establish balance and then move deliberately. This may also support more efficient gas use. Phoenix Divers has a separate guide explaining how to improve gas consumption while diving, including the roles of relaxation, technique and physical effort. 10. Ask for focused feedback Your weighting Trim and cylinder position BCD use Breathing pattern Finning technique Depth awareness A focused session can identify habits that have continued unnoticed across many dives. Why buoyancy matters for marine conservation Controlled divers are less likely to kick coral, stir sediment or collide with marine life. They can approach subjects more calmly and enjoy better visibility without relying on the environment for support. SSI describes buoyancy training as a way to improve body position and relaxed diving while also developing techniques that help protect the environment. You can read more about the SSI Perfect Buoyancy programme. Continue developing your diving skillsBuoyancy improves when you combine knowledge with regular, mindful practice. Make one or two changes at a time, ask for feedback and notice how your equipment and breathing affect your position. Certified divers can explore Phoenix Divers’ advanced diving courses in Koh Tao. The Advanced Diving Course provides opportunities to extend your experience and practise skills in different diving situations.Get in touch