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Index of underwater diving: N–Z

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The following index is provided as an overview of and topical guide to underwater diving: Links to articles and redirects to sections of articles which provide information on each topic are listed with a short description of the topic. When there is more than one article with information on a topic, the most relevant is usually listed, and it may be cross-linked to further information from the linked page or section.

Two divers wearing lightweight demand helmets stand back-to-back on an underwater platform holding on to the railings. The photo also shows the support vessel above the surface in the background.
Surface-supplied divers riding a stage to the underwater workplace

Underwater diving can be described as all of the following:

  • A human activity – intentional, purposive, conscious and subjectively meaningful sequence of actions. Underwater diving is practiced as part of an occupation, or for recreation, where the practitioner submerges below the surface of the water or other liquid for a period which may range between seconds to order of a day at a time, either exposed to the ambient pressure or isolated by a pressure resistant suit, to interact with the underwater environment for pleasure, competitive sport, or as a means to reach a work site for profit or in the pursuit of knowledge, and may use no equipment at all, or a wide range of equipment which may include breathing apparatus, environmental protective clothing, aids to vision, communication, propulsion, maneuverability, buoyancy and safety equipment, and tools for the task at hand.

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Subsection: Top, Na, Ne, Ni, No, Nu

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  • Night diver – Certification of competence to scuba dive at night
  • Night diving – Underwater diving during the hours of darkness
  • Nikonos – Brand of 35mm film amphibious cameras
  • Nitrogen narcosis – Reversible narcotic effects of respiratory nitrogen at elevated partial pressures
  • Nitrous oxide (medication) – Gas used as anesthetic and for pain relief
  • Nitrox – Breathing gas, mixture of nitrogen and oxygen
  • Nitrox blender – Person competent to blend nitrox for scuba diving
  • Nitrox diver – Recreational diving qualification to dive using oxygen enriched air
  • Nitrox production – Methods of producing nitrox mixtures

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  • Nuclear diving – Diving in an environment where there is a risk of exposure to radioactive materials

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Subsection: Top, Ob, Oc, Of, Om–On, Op, Or, Os, Ou, Ov, Ox

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  • Orca Edge – First commercially viable personal decompression computer
  • Orinasal mask, also known as Oral-nasal mask – Breathing mask that covers the mouth and the nose only.

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  • Osprey Reef – Submerged atoll in the Coral Sea, northeast of Queensland, Australia

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  • Oxygen analyser – Instrument to measure partial pressure of oxygen in a gas mixture
  • Oxugen cell – Electro-galvanic fuel cell used for measuring oxygen concentration
  • Oxygen cleaning – Removal of contaminants that might cause a fire hazard in an oxygen rich environment
  • Oxygen compatibility – Usability in high-oxygen environments
  • Oxygen decompression – Use of oxygen for accelerated decompression
  • Oxygen enriched air – Air with added oxygen
  • Oxygen fraction – The molar or volumetric fraction of oxygen in a gas
  • Oxygen prebreathing – Procedure to reduce risk of decompression sickness before hypobaric exposure
  • Oxygen service – Use in contact with high partial pressures of oxygen
  • Oxygen therapy – Use of oxygen as a medical treatment
  • Oxygen toxicity – Toxic effects of breathing oxygen at high partial pressures
  • Oxygen toxicity seizure – Underwater diving emergency
  • Oxygen window, also known as oxygen window in technical diving – Physiological effect of oxygen metabolism on the total dissolved gas concentration in venous blood

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Subsection: Top, Pa, Pe, Ph, Pi, Pn, Po, Pr, Ps, Pu, Py

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  • Pneumofathometer – Instrument for measuring the depth of a diver by air pressure

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  • Pyle stop – Type of short deep decompression stops in addition to the standard profile
  • Pyle, Richard – American ichthyologist and scuba diver

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Subsection: Top, Ra, Re, Ri–Rn, Ro, Ru

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  • Rack operator – Member of a surface-supplied diving team who operates the breathing gas panel
  • Raid on Alexandria (1941) – Italian frogman raid on British warships
  • Raid on Algiers – Italian frogman raid on Allied ships in Algiers harbour in 1942
  • Rash guard, also known as Rash vest – Stretch garment for protection from abrasion, UV and stings
  • Ratchet reel (diving) – Type of reel used by divers to deploy and recover line
  • Ratio deco – Rule of thumb for estimating a decompression schedule for a given set of breathing gases
  • Ratio decompression – Rule of thumb for estimating a decompression schedule for a given set of breathing gases
  • Rawlins, John – Royal Navy officer and pioneer in the field of diving medicine

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Subsection: Top, Sa–Sb, Sc–Sd, Se, Sh, Si–Sj, Sk, Sl, Sm, Sn, So, Sp–Sr, St, Su, Sw, Sy

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  • Sladen Suit – Early British military drysuit
  • Sling (rigging) – Rope, webbing, wire or chain used to support a load for lifting
  • Sling cylinder – An independent scuba set carried clipped to the side of a scuba diver's harness
  • Slingshot valve – Dual outlet scuba cylinder valve with Y-shape body

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  • Snag-line search – Use of a taut line towed across the search area to catch on the target
  • Snell's law, also known as Law of refraction – Formula for refraction angles
  • Snoopy loop, also known as ranger band – Rubber band made from inner tube
  • Snorkel – Tube for breathing face down at the surface of the water
  • Snorkel mask – Breathing apparatus for surface swimming
  • Snorkeling – Swimming while inhaling through a snorkel
  • Snorkeling vest, also known as snorkelling vest – Personal buoyancy aid for use while snorkeling
  • Snuba – Limited depth airline breathing apparatus towed by the diver

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Subsection: Top, Ta, Te, Th, Ti, To, Tr, Tu, Tw, Ty

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  • Tactical Divers Group – Special operations force of the Argentine Navy.
  • Taifib – Indonesian amphibious reconnaissance unit
  • Talus cave – Type of cave
  • Tank weight – Ballast weight attached to a scuba cylinder
  • Taravana – Decompression sickness after breath-hold diving
  • Task loading – Relationship between operator capacity and the accumulated activities that must be done

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  • Tidal race – Fast-moving tidal flow passing through a constriction, forming waves, eddies and strong currents
  • Tide – Rise and fall of the sea level under astronomical gravitational influences
  • Tillman, Albert – American educator and underwater diver
  • Timeline of diving technology, also known as Timeline of underwater diving technology – Chronological list of notable events in the history of underwater diving equipment
  • Time to surface (TTS) – Estimated ascent and decompression time from a given point on a dive profile
  • Tissue (biology) – Group of similar cells performing a specific function
  • Tissue gas loading – Amount of gas dissolved in a tissue
  • Tissue slab decompression model – A diffusion limited series tissue decompression model
  • Tissue slab diffusion model – Diffusion limited series tissue decompression model

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  • Tubesuit – Active heat transfer undergarment
  • Turbidity – Cloudiness of a fluid
  • Turkish Underwater Sports Federation (TSSF), also known as Türkiye Sualtı Sporları Federasyonu – Turkish national governing body for underwater sport and lifesaving
  • Turn pressure – Gas pressure at which the divers start the return from a dive

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Subsection: Top, Um, Un, Up, Us, Uw

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  • Uwatec – Manufacturer of diving equipment

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Subsection: Top, Va, Ve, Vi, Vo

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  • Venting the rebreather loop, also known as venting the loop – Intentionally releasing gas from the breathing circuit}
  • Venture One diving accident – Saturation diving fatality in the North Sea in 1977
  • Vertical Blue – Freediving competition in The Bahamas at Dean's Blue Hole
  • Vertigo – Type of dizziness where a person has the sensation of moving or surrounding objects moving

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  • VideoRay UROVs – Series of inspection class remotely operated underwater vehicles
  • Viewport (diving) – Transparent part of a helmet, submersible, or diving chamber
  • Vintage scuba – Early model scuba equipment and the ongoing activity of diving with it

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Subsection: Top, Wa, We, Wi, Wo, Wr

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  • Wreck Alley – Area off California with several wrecks sunk as artificial reefs
  • Wreck diving – Recreational diving on wrecks

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