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Snorkels are to skin diving as the scuba is to scuba diving. To be able to swim with fins for long distances, while keeping the head looking down, and not having to turn and breathe makes all the difference in the world.
However, snorkels in scuba diving are becoming less popular. Even though most certifying agencies still require the use of the snorkel, the fact of the matter is they are rarely needed, cumbersome, and annoying. The main purpose for using a snorkel during a scuba dive, as is stated in the textbooks, is to allow the diver to swim on the surface for long distances without the need for trying to breathe by lifting the head out of the water. Get over on your back, enjoy the swim, and talk to your buddy while you are doing it!
Some of the things to look for when purchasing a snorkel are:
Snorkels are traditionally worn on the left side of the diver's mask. That is because the scuba regulator comes over the right shoulder and both would conflict with each other.
The snorkel should be attached to the outside of the mask strap rather than putting it under it. Masks may leak if the snorkel is between the strap and the head, and if a keeper is not use the snorkel may be lost without warning. Also, it may become uncomfortable after a period of time to have it pressed against the head.
Proper breathing is important for pleasurable skin diving. The breathing should be longer and deeper (not faster) than usual. It is important to blow as much air out of the lungs as is comfortable. Short breaths would simply fill the snorkel with waste air that would be inhaled over and over again. A real shallow breath would not bring in any fresh air and the diver would suffer from oxygen starvation. Long, slow breaths are the key to enjoyable skin dives. The exhale should be fast followed by a deep inhale. Then hold your breath for a short time. Your expanded lungs will help to maintain buoyancy!
Lastly, there are two methods of getting water out of a non-purge valve snorkel. One is to surface and blow as hard as possible through the mouth. This burst of air should eliminate most, if not all, the water from the snorkel. Be careful on the inhalation. Start slowly just in case there is still a little water remaining. If so, there will be a sprinkling of water drops into the mouth. A quick inhale could cause coughing. If water remains in the snorkel, breathe in slowly until the lungs have sufficient air to blow out hard again. The second method of clearing has to be done in water where the diver can rise to the surface in a vertical position. On the way up, the head is tilted back so the diver is looking directly at the surface. As the surface is neared, air is gently blown into the snorkel continuously. As soon as the surface is reached, the head is brought to the position where the diver is looking toward the bottom. The snorkel should be completely empty! The effort is so slight compared to the forceful exhalation technique, skin diving can be done for hours without chest discomfort!
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