Appropriate Buoyancy Control Device:
Proper buoyancy control starts with a properly fitted Buoyancy Control Device or BCD that is also appropriate for the type of scuba diving you are doing. Scuba diving in cold areas requires a thicker wetsuit then scuba diving in warmer or tropical areas. The extra thickness of the wetsuit means that the scuba diver has to wear more weight then a diver with a thinner wetsuit. The extra weight means that the buoyancy control device needs to have more lift capacity then that of a warm water diver. You can dive in warmer water with a cold water BCD but you may not be able to dive in cold water with a tropical weight BCD.
Maintain Proper Weighting:
Scuba divers wear lead weight to offset the natural positive buoyancy of the human body and pieces of scuba diving equipment like the diver’s wet suit. If you do not wear enough weight you will not sink properly. If you wear too much you will have to over inflate your buoyancy control device to offset the excess weight. This will cause extra drag and resistance when diving making the diver work harder. Working harder means wasted energy and that the diver will breath through his or her air supply at a much faster rate. You can check to make sure that you have the correct amount of weight by floating on the surface in a face up position. Let all of the air out of your BCD and inhale fully. You should float at eye level. When you exhale you should start to slowly sink into the water. Remember that an aluminum scuba cylinder will become more buoyant as the air within it is used up. For this reason a diver should add four pounds of weight to offset the excess buoyancy that will be present during the latter part of the dive. Thus the scuba diver will be properly weighted at the end of the dive when doing a safety stop.
Maintain Proper Body Positioning and Stream Line When Diving:
The best position when scuba diving at depth is to be as horizontal as possible. This means that the diver will have less drag and resistance and will not have to work as hard during the dive. A proper fin kick will insure that energy is not wasted. Keep your hands together and do not skull or use hand movements when scuba diving. Hand movements merely create more drag and causes the diver to tire and to use air faster thus shortening your bottom time. Streamlining also means having your equipment properly secured and pinned to your BCD. This will prevent entanglements and insure that you are more streamlined.