Snorkeling

Essential equipment includes the snorkel for breathing, and a diving mask or swimming goggles for vision. Swimfins for more efficient propulsion are common. Environmental protection against cold, sunburn, and marine stings and scratches is also regionally popular, and may be in the form of a wetsuit, dry suit, dive skins, or rash vest. Some snorkelers rely on waterproof sunscreen lotions, but some of these are environmentally damaging. If necessary, the snorkeler may wear a weightbelt to facilitate freediving, or an inflatable snorkeling vest, a form of buoyancy aid, for safety. Snorkel A snorkel is a device used for breathing air from above the surface when the wearer's head is facing downwards in the water with the mouth and the nose submerged. It may be either separate or integrated into a swimming or diving mask. The integrated version is only suitable for surface snorkeling, while the separate device may also be used for underwater activities such as spearfishing, freediving, finswimming, underwater hockey, underwater rugby and for surface breathing with scuba equipment. A swimmer's snorkel is a tube bent into a shape often resembling the letter "L" or "J", fitted with a mouthpiece at the lower end and constructed of light metal, rubber or plastic. The snorkel may come with a rubber loop or a plastic clip enabling the snorkel to be attached to the outside of the head strap of the diving mask. Although the snorkel may also be secured by tucking the tube between the mask strap and the head, this alternative strategy can lead to physical discomfort, mask leakage or even snorkel loss. features a slightly concave flange with two lugs to be gripped between the teeth. The tighter the teeth grip the mouthpiece lugs, the smaller the air gap between the teeth and the harder it will be to breathe. A tight grip with the teeth can also cause jaw fatigue and pain. Full-face snorkel mask 's Easybreath snorkel mask An integrated snorkel consists essentially of a tube topped with a shut-off valve and opening at the bottom into the interior of a diving mask. Integrated snorkels must be fitted with valves to shut off the snorkel's air inlet when submerged. Water will otherwise pour into the opening at the top and flood the interior of the mask. Snorkels are attached to sockets on the top or the sides of the mask. New-generation snorkel masks are full-face masks covering the eyes, the nose, and the mouth. They enable surface snorkelers to breathe nasally or orally and may be a workaround in the case of surface snorkelers who gag in response to the presence of standard snorkel mouthpieces in their mouths. Some early snorkel masks are full-face masks covering the eyes, nose, and mouth, while others exclude the mouth, covering the eyes and the nose only. The 1950s US Divers "Marino" hybrid comprised a single snorkel mask with eye and nose coverage and a separate snorkel for the mouth. Full-face snorkel masks use an integral snorkel with separate channels for intake and exhaled gases theoretically ensuring the user is always breathing untainted fresh air whatever the respiratory effort. They come with a built-in dry top snorkel system. In addition to a standard ball float system that stops the water from entering the tube when submerged, full-face masks are designed in such a way that even if a small amount of water does get into the snorkel, it will be channeled away from the face and into the chin area of the mask. A special valve located on the bottom of the chin allows to drain the water out. The main problem is that it must fit the whole face well enough to make a reliable seal and since no two faces are the same shape, it may not seal adequately on any specific user. In the event of accidental flooding, the whole mask must be removed to continue breathing. Unless the snorkeler is able to equalize without pinching their nose it can only be used on or within several feet of the surface, since the mask covers the nose with a rigid plastic structure, which makes it impossible to pinch the nose if needed to equalize pressure at greater depth. Trained scuba divers are likely to avoid such devices, however, snorkel masks are a boon for those with medical conditions that preclude taking part in scuba diving. As a result of a short period with an unusually high number of snorkeling deaths in Hawaii there is some suspicion that the design of the masks can result in buildup of excess CO2. It is far from certain that the masks are at fault, but the state of Hawaii has begun to track the equipment being used in cases of snorkeling fatalities. Besides the possibility that the masks, or at least some brands of the mask, are a cause, other theories include the possibility that the masks make snorkeling accessible to people who have difficulty with traditional snorkeling equipment. That ease of access may result in more snorkelers who lack experience or have underlying medical conditions, possibly exacerbating problems that are unrelated to the type of equipment being used. During the 2019–20 coronavirus pandemic related shortages, full-face snorkel masks were adapted to create oxygen dispensing emergency respiratory masks by deploying 3D printing and carrying out minimal modifications to the original mask. Italian healthcare legislation required patients to sign a declaration of acceptance of use of an uncertified biomedical device when they were given the modified snorkel mask for respiratory support interventions in the country's hospitals. France's main sportwear and snorkel masks producer Decathlon paused its sale of snorkel masks, redirecting them instead toward medical staff, patients and 3D printer operations. Diving mask Snorkelers normally wear the same kind of mask as those worn by scuba divers. By creating an airspace, the mask enables the snorkeler to see clearly underwater. All scuba diving masks consist of the lenses also known as a faceplate, a soft rubber skirt, which encloses the nose and seals against the face, and a head strap to hold it in place. There are different styles and shapes. These range from oval shaped models to lower internal volume masks and may be made from different materials; common choices are silicone and rubber. A snorkeler who remains at the surface can use swimmer's goggles which do not enclose the nose. Swimfins Swimfins, fins or flippers are fin-like accessories worn on the feet, In the new millennium, the use of drysuits in snorkelling is seeing something of a resurgence, thanks to the growing popularity of "wilderness swimming" or "wildswimming" in seas, lakes and rivers. Dive skins are used when diving in water temperatures above . They are usually one piece full length garments made from spandex or Lycra and provide little thermal protection, but do protect the skin from jellyfish stings, abrasion and sunburn. This kind of suit is also known as a 'Stinger Suit'. Some divers wear a dive skin under a wetsuit, which allows easier donning and (for those who experience skin problems from neoprene) provides additional comfort. They are generally made of tough nylon webbing, but other materials such as rubber can be used. Weight belts for snorkeling are generally fitted with a quick release buckle to allow the dumping of weight rapidly in an emergency. The most common design of weight used with a belt is rectangular lead blocks with two slots in them threaded onto the belt. These blocks can be coated in plastic, which increases corrosion resistance. The plastic coated weights may be marketed as being less abrasive to wetsuits. The weights may be constrained from sliding along the webbing by metal or plastic belt sliders. Another popular style has a single slot through which the belt can be threaded. These are sometimes locked in position by squeezing the weight to grip the webbing, but this makes them difficult to remove when less weight is needed. There are also weight designs which may be added to the belt by clipping on when needed. The amount of weight needed depends mainly on the buoyancy of the wet suit. Snorkeling vest An inflatable personal buoyancy aid designed for surface swimming applications. In shape, often like a horse-collar buoyancy compensator, or airline life jacket, but only with oral inflation or a CO2 cartridge for emergencies. == Operation ==

The simplest type of snorkel is a plain tube that is allowed to flood when underwater. The snorkeler expels water from the snorkel either with a sharp exhalation on return to the surface (blast clearing) or by tilting the head back shortly before reaching the surface and exhaling until reaching or breaking the surface (displacement method) and facing forward or down again before inhaling the next breath. The displacement method expels water by filling the snorkel with air; it is a technique that takes practice but clears the snorkel with less effort, but only works when surfacing. Clearing splash water while at the surface requires blast clearing. Experienced users tend to develop a surface breathing style which minimizes work of breathing, carbon dioxide buildup and risk of water inspiration, while optimizing water removal. This involves a sharp puff in the early stage of exhalation, which is effective for clearing the tube of remaining water, and a fairly large but comfortable exhaled volume, mostly fairly slowly for low work of breathing, followed by an immediate slow inhalation, which reduces entrapment of any residual water, to a comfortable but relatively large inhaled volume, repeated without delay. Elastic recoil is used to assist with the initial puff, which can be made sharper by controlling the start of exhalation with the tongue. This technique is most applicable to relaxed cruising on the surface. Racing finswimmers may use a different technique as they need a far greater level of ventilation when working hard. Some snorkels have a sump at the lowest point to allow a small volume of water to remain in the snorkel without being inhaled when the snorkeler breathes. Some also have a non-return valve in the sump, to drain water in the tube when the diver exhales. The water is pushed out through the valve when the tube is blocked by water and the exhalation pressure exceeds the water pressure on the outside of the valve. This is almost exactly the mechanism of blast clearing which does not require the valve, but the pressure required is marginally less, and effective blast clearing requires a higher flow rate. The full face mask has a double airflow valve which allows breathing through the nose in addition to the mouth. A few models of snorkel have float-operated valves attached to the top end of the tube to keep water out when a wave passes, but these cause problems when diving as the snorkel must then be equalized during descent, using part of the diver's inhaled air supply. Some recent designs have a splash deflector on the top end that reduces entry of any water that splashes over the top end of the tube, thereby keeping it relatively free from water. Finswimmers do not normally use snorkels with a sump valve, as they learn to blast clear the tube on most if not all exhalations, which keeps the water content in the tube to a minimum as the tube can be shaped for lower work of breathing, and elimination of water traps, allowing greater speed and lowering the stress of eventual swallowing of small quantities of water, which would impede their competition performance. A common problem with all mechanical clearing mechanisms is their tendency to fail if infrequently used, or if stored for long periods, or through environmental fouling, or owing to lack of maintenance. Many also either slightly increase the flow resistance of the snorkel, or provide a small water trap, which retains a little water in the tube after clearing. Modern designs use silicone rubber in the mouthpiece and one-way clearing and float valves due to its resistance to degradation and its long service life. Natural rubber was formerly used, but slowly oxidizes and breaks down due to ultraviolet light exposure from the sun. It eventually loses its flexibility, becomes brittle and cracks, which can cause clearing valves to stick in the open or closed position, and float valves to leak due to a failure of the valve seat to seal. In even older designs, some snorkels were made with small "ping pong" balls in a cage mounted to the open end of the tube to prevent water ingress. These are no longer sold or recommended because they are unreliable and considered hazardous. Similarly, diving masks with a built-in snorkel are considered unsafe by scuba diving organizations such as PADI, BSAC because they can engender a false sense of security and can be difficult to clear if flooded. A snorkel may be either separate or integrated into a swim mask. Usage of the term "snorkel" in this section excludes devices integrated with, and opening into, swimmers' or divers' masks. A separate snorkel typically comprises a tube for breathing and a means of attaching the tube to the head of the wearer. The tube has an opening at the top and a mouthpiece at the bottom. Some tubes are topped with a valve to prevent water from entering the tube when it is submerged. The total length, inner diameter and/or inner volume of a snorkel tube are matters of utmost importance because they affect the user's ability to breathe normally while swimming or floating head downward on the surface of the water. These dimensions also have implications for the user's ability to blow residual water out of the tube when surfacing. An overlong snorkel tube may cause breathing resistance, while an overwide tube may prove hard to clear of water. A high-volume tube is liable to encourage a build-up of stale air, including exhaled carbon dioxide, because it constitutes respiratory dead space. == Practice of snorkeling ==

Snorkeling is an activity in its own right, as well as an adjunct to other activities, such as breath-hold diving, spearfishing and scuba diving, Underwater photography Underwater photography has grown in popularity since the early 2000s as waterproof cameras became affordable to recreational users. Many snorkelers now carry a waterproof camera with them while they snorkel and may record photographs or video clips and later share them on social media platforms or post them to other websites. This mass of documentation has enormous scientific potential, as millions of tourists are able to cover greater areas than professional scientists whose field-study time is limited. Various citizen science programs have emerged to realize this potential. Thus underwater photographs of natural subjects become database records of geo-located and time-stamped species observations. The observed species may be identified by the contributor or by other website users or team members, depending on the platform. Various protocols for organization and self-directed study for snorkelers interested in natural science also exist. In Réunion, these approaches have resulted in many new records and even the discovery of new species. When snorkeling on or near coral reefs, care must be exercised to avoid contact with the delicate (and sometimes sharp or stinging) coral, and its venomous inhabitants, usually by wearing protective gloves and being careful of one's environment. Coral scrapes and cuts often require specialized first aid treatment and potentially, emergency medical treatment to avoid infection. Booties and surf shoes are especially useful as they allow trekking over reefs exposed by low tide, to access drop-offs or deeper waters of the outer reef—practices which are, however, considered ecologically irresponsible. Contact with coral should always be avoided, because even boulder corals are fragile. Fin contact is a well-known cause of coral reef degradation. Another safety concern is interaction and contact with the marine life during encounters. While seals and sea turtles can seem harmless and docile, they can become alarmed if approached or feel threatened. Some creatures, like moray eels, can hide in coral crevices and holes and may bite fingers in response to prodding. For these reasons, snorkeling websites often recommend an "observe but don't touch" etiquette when snorkeling. Generally shallow reefs ranging from are favored by snorkelers. Enough water cover to swim over the top without kicking the bottom is needed, but isolated shallow structure can be approached from the sides. Deeper reefs can also be explored, but repeated breath-holding to dive to those depths limits the number of practitioners, and raises the bar on the required fitness and skill level. Risk increases with increased depth and duration of the breath-hold excursions from the surface. Some less commonly snorkeled bodies of water include sinkholes, lakes and rivers. Snorkeling locations are often listed and described in publications promoting both diving and snorkeling in a particular region. Lonely Planet has published many of these, including several focusing on nations in the Caribbean. The Great Barrier Reef, Mexico, Belize, Bonaire, the Bahamas, Galápagos Islands, Hawaiian Islands and Indonesia are some of the most loved snorkeling destinations in the world. Variants and related activities • Bog snorkeling: An individual sport, popular in the United Kingdom and Australia. • Finswimming: An individual competitive speed and endurance sport, the most popular competitive sport of CMAS, the only sport of this federation present in World Games. Finswimmers use a slightly different snorkel, suited for hydrodynamics and speed. • Free-diving: Any form of diving without breathing apparatus, but often referring to competitive apnea as a sport. • Scuba diving: A form of untethered diving using a self-contained portable breathing apparatus, frequently as a pastime. • Spearfishing: Fishing with a spear often with snorkeling equipment, either for competitive sport or to obtain food. • Underwater hockey: A competitive team-sport played in swimming pools using snorkeling equipment, sticks and a puck. • Underwater rugby: A competitive team-sport played in deeper swimming pools using snorkeling equipment, baskets and a ball. ==See also==