Some home made rebreather were used by cave divers to penetrate cave sumps.

Some rebreather divers prefer not to carry enough bailout for a safe ascent breathing open circuit, but instead rely on the rebreather, believing that an irrecoverable rebreather failure is very unlikely.

Some rebreather divers fit backplates to their rebreathers.

Some of these may carry pure oxygen for accelerated decompression or as a component of a rebreather.

Some divers may find pike easier in a flip than tuck, and most find straight the easiest in a front / back dive, although it is still rated the most difficult because of the risk of overrotation.

' I am she that is the natural mother of all things, mistress and governess of all the elements, the initial progeny of worlds, chief of powers divine, Queen of heaven, the principal of the Gods celestial, the light of the goddesses: at my will the planets of the air, the wholesome winds of the Seas, and the silences of hell be disposed ; my name, my divinity is adored throughout all the world in divers manners, in variable customs and in many names, [...] Some call me Juno, others Bellona of the Battles, and still others Hecate.

Some divers will store it in a BC pocket, but this reduces availability in an emergency.

Some divers use nitrox, which usually has a higher percentage of oxygen, often 32 % or 36 % in EAN32 and EAN36, respectively.

Some divers instead connect their backup regulator to a smaller " pony cylinder " for extra safety, and there are also emergency systems which mount a simple regulator directly to the top of a small cylinder.

Some diver training organizations and groups of divers teach techniques, such as DIR diving for configuring diving equipment.

Some divers suffer from hyperbaric arthralgia during descent.

The most impressive diving exhibited by shearwaters is found in the Short-tailed Shearwater, which has been recorded diving below 70 m. Some albatross species are also capable of some limited diving, with Light-mantled Sooty Albatrosses holding the record at 12 m. Of all the wing-propelled pursuit divers, the most efficient in the air are the albatrosses, and it is no coincidence that they are the poorest divers.

Some plunge divers ( as well as some surface feeders ) are dependent on dolphins and tuna to push shoaling fish up towards the surface.

Some divers collect aluminum cans, which they can then sell for a small profit.

< center > Some remoras, such as this Echeneis naucrates, may attach themselves to scuba divers.

Some consider a dry suit mandatory ; however, a thick wetsuit may be sufficient for hardier divers.

Some precautions and skills for night diving include: avoiding shining your light in other divers ' eyes, to be aware of and use surface light signals for bearings, or similarly use a surface marker buoy with an attached strobe or cyalume stick.

Some commercial divers order their suits without boots and install rubber work boots such as those used by miners or firefighters.

Some divers ensure that the bubble remains at the top of their body by using the buoyancy compensator to counteract any excess weighting, keeping only the minimum gas necessary to avoid squeeze inside the drysuit.

Some British armed forces divers used bulky thick diving suits called Sladen suits ; one version of it had a flip-up single faceplate for both eyes to let the user get binoculars to his eyes when on the surface.

Some countries ' frogman organizations include a translation of the word " frogman " in their official names, e. g. Denmark's Frømandskorpset and Norway's Froskemanskorpset ; others call themselves " combat divers " or similar.

Some especially hardy midwestern and north central SCUBA divers go spearfishing under the ice in the winter when water clarity is at its best.

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.

Some divers can put on their own helmet, but it is usual for the topside crew to do most of the locking on to the neck dam, and check that there are no obvious faults with the seal.

Some divers prefer negatively buoyant fins.

Some of the first training started in 1952 at the Scripps Institution of Oceanography where Andy Rechnitzer, Bob Dill and Connie Limbaugh taught the first scuba courses in the United States, then in 1953 Trevor Hampton created the first British diving school, the British Underwater Centre and in 1954 when Los Angeles County created an Underwater Instructor Certification Course based on the training that they received from the scientific divers of the Scripps Institution of Oceanography.

Some fish had developed primitive lungs to help them breathe air when the stagnant pools of the Devonian swamps were lacking in oxygen.

Some dragons are said to breathe fire or to be poisonous, such as in the Old English poem Beowulf.

Some sharks suffocate within about 15 minutes while the whale holds them still, because these sharks need to move to breathe.

Many tightlacers dream of and waists, but are usually satisfied with anything under. Some went so far that they could only breathe with the top part of their lungs.

Some goods are " free ", such as the air we breathe, objects that could not sell at any price, or could not be given away.

Some species are considered air-breathing fishes because of their ability to breathe by highly vascularized buccopharyngeal pouches ( pharynx modified for breathing air ).

Some can move on land like snakes, and breathe air.

Some Dinalfos can also breathe fire.

Some of these materials " breathe " better than metals or plastics, preventing the buildup of sebum in the enlarged ear lobe.

Some of these fish are able to breathe atmospheric oxygen ( Clariidae ) or even live out of water ( Phreatobius cisternarum ).

Some gracefully soared from the backs of their wounded, screaming mounts to make one last defiant charge before the lead split their hearts or tore their guts.

Some of the ruddiness was gone from his face and he stared at Ramey.

Some let dances take their form from the experience of creation.

Some students from the University returned around six with a large pot containing enough hot soup to last me a week.

Some reports say he was rescued from timely retirement by his friend, Congressman Walter of Pennsylvania, at a moment when the Kennedy Administration was diligently searching for all the House votes it could get.

Some memorable plays have been drawn from books, notably Life With Father and Diary Of Anne Frank.

Some deductions are subtracted from Gross Income to determine Adjusted Gross Income.

Some 80 reaction tubes from 13 manifold fillings were illuminated in the temperature range from 40 to 85-degrees in a further endeavor to determine the cause of the irreproducibility and to obtain information on the activation energy and the effect of light intensity.

Some of these were obviously filling from interlobular branches of the bronchial arteries while others were filling from direct hilar branches following along the pleural surface.

Some investigators have found a parallelism between remissions and return of the sympathetic reactivity of the hypothalamus to the normal level as indicated by the Mecholyl test and, conversely, between clinical impairment and increasing deviation of this test from the norm.

Some date it from woman suffrage, others from when women first began to challenge men in the marketplace, still others from the era of the emancipated flapper and bathtub gin.

Some of them came from people who identified themselves.

Some excellent filmstrips with recordings and motion pictures may be secured from your denominational headquarters to enrich the class session.

Some clue to the character of London's approach in these discs may be gained immediately from the fact that ten of the 12 titles include the word `` percussion '' or `` percussive ''.

Some of the New York Philharmonic musicians who live in the suburbs spent yesterday morning digging themselves free from snow.

Some people said Linda had just announced the engagement to jolt John into some action, but when John came home from a business trip to Cleveland with Edythe, with Edythe his bride, it could no longer be John-and-Linda even to sentimental wishful thinkers.

Some jurisdictions have specialized appellate courts, such as the Texas Court of Criminal Appeals, which only hears appeals raised in criminal cases, and the United States Court of Appeals for the Federal Circuit, which has general jurisdiction but derives most of its caseload from patent cases, on the other hand, and appeals from the Court of Federal Claims on the other.

Some scholars point to a character from the Babylonian cuneiform which may have been derived from a representation of the abacus.

Some adaptations of the Latin alphabet are augmented with ligatures, such as æ in Old English and Icelandic and Ȣ in Algonquian ; by borrowings from other alphabets, such as the thorn þ in Old English and Icelandic, which came from the Futhark runes ; and by modifying existing letters, such as the eth ð of Old English and Icelandic, which is a modified d. Other alphabets only use a subset of the Latin alphabet, such as Hawaiian, and Italian, which uses the letters j, k, x, y and w only in foreign words.