Wikipedia

Index of underwater diving: A–M

See the Glossary of underwater diving terminology for definitions of technical terms, jargon, diver slang and acronyms used in underwater diving
See the Outline of underwater diving for a hierararchical listing of underwater diving related articles
See the Index of underwater divers for an alphabetical listing of articles about underwater divers
See the Index of recreational dive sites for an alphabetical listing of articles about places which are recreational dive sites

The following index is provided as an overview of and topical guide to underwater diving:

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, Ab, Ac, Ad, Ae, Af, Ai, Al, Am, An, Ap, Aq, Ar, As, At, Au, Av

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  • AFLOLAUN – Apparatus for laying out line and underwater navigation

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  • AIDA Hellas – National representative of AIDA International in Greece
  • AIDA International (AIDA) – Worldwide rule- and record-keeping body for competitive breath-hold events
  • Air embolism – Vascular blockage by air bubbles
  • Airlift (dredging device), also known as air-lift – Dredging device using injected air to move water and entrained load up a pipe
  • Airlift dredge – Dredging device using injected air to move water and entrained load up a pipe
  • Airlift dredging – Removing underwater sediment using an airlift pump
  • Air line – Tube or hose carrying a compressed air supply
  • Air-line diving, also known as airline diving – Basic mode of surface-supplied underwater diving
  • Airlock, also known as air-lock – Compartment for transfer between environments with different atmospheres
  • Air lock diving bell – Type of mobile pressure caisson
  • Air lock diving-bell plant – Underwater work support barge used at Gibraltar
  • Air spread – The topside base for surface-supplied air diving operations
  • Air top, also known as air top-up – Modifying or completing a gas blend by adding compressed air

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  • Anchor pattern – Arrangement of anchors allowing precise positioning of a vessel
  • Anti-fog – Chemicals that prevent the condensation of water as small droplets on a surface
  • Anti-frogman techniques – Methods of protection from incursions by divers and swimmers
  • AN/WQX-2 – Diver detection sonar used in defense against underwater incursions
  • Ankle strap (diving) – Staps worn over the ankles of dry suits to prevent the boots from pulling off when in use
  • Ankle weights (diving) – Diver trim weights worn at the ankles
  • ANMP – Association nationale des moniteurs de plongée
  • ANSTI breathing simulator – Machine to measure work of breathing of diving apparatus
  • ANSTI machine – Machine to measure work of breathing of diving apparatus
  • Anti-fog – Chemicals that prevent the condensation of water as small droplets on a surface
  • Anti-frogman techniques – Methods of protection from incursions by divers and swimmers
  • Antipodes (submersible) – Commercial submarine built in 1973
  • Anxiety – Unpleasant state of inner turmoil over anticipated events

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Subsection: Top, Ba, Be, Bi, Bl, Bo, Br, Bu

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  • Bifin – Swimfin type with single foot pocket
  • Biological hazard – Biological material that poses serious risks to the health of living organisms

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  • Boarding stirrup – A suspended step to help divers lift themselves from the water into a boat
  • Boat diving – Procedures specific to diving from boats
  • Boaty McBoatface – British autonomous underwater vehicle
  • Bolt snap – Sprung slide gated snap hook
  • Bond, George F. – US Navy physician and diving medicine and saturation diving researcher
  • Booster pump – Machine to increase pressure of a fluid
  • Bottom gas – Gas breathed during the deep part of a dive
  • Bottom time – Elapsed time underwater until th start of ascent to the surface
  • Bottom timer – An electronic instrument that records depth and elapsed time data on an underwater dive
  • Boyle, Robert – Anglo-Irish scientist (1627–1691)
  • Boyle's law – Relation between gas pressure and volume

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Subsection: Top, Ca, Ce, Ch, Ci, Cl, Cm, Co, Cr, Cu, Cy

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  • HMS Challenger K07 – Royal Navy saturation diving support vessel
  • Chamber operation – Operation of a hyperbaric chamber in support of underwater diving
  • Chamber operator – A person who operates a diving chamber
  • Charles's law – Relationship between volume and temperature of a gas at constant pressure
  • Chase boat – A tender generally not carried by the main vessel
  • Checklist – Aide-memoire to ensure consistency and completeness in carrying out a task
  • Checkout dive – Short dive to test a skill or equipment
  • Chemical hazard – Non-biological hazards of hazardous materials
  • Christmas tree ladder – Ladder with rungs cantilevered from a central rail

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  • CMAS* scuba diver – Entry level recreational diving certification from CMAS
  • CMAS** scuba diver, also known as CMAS two-star scuba diver – Autonomous recreational scuba diving certification
  • CMAS*** scuba diver – Fully trained and experienced recreational dive
  • CMAS**** scuba diver – A three-star diver with a high level of competence and broad experience
  • CMAS Europe – Non-profit branch of the world underwater federation representing European affiliates

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  • CUMA – Canadian military diving rebreather
  • Current (hydrology) – Flow of water in a stream caused by gravity
  • Current shear – Variation of flow rate transverse to flow direction
  • Current (stream) – Flow of water in a stream caused by gravity
  • CURV – Early remotely operated underwater vehicle

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Subsection: Top, Da, De, Di, Do, Dr, Ds, Du, Dy

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Subsection: Top, Ea, El, Em, En, Eq, Es, Eu, Ex

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Subsection: Top, Fe, Fi, Fl, Fo, Fr, Fu

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Subsection: Top, Ga, Ge, Gl, Go, Gr, Gy

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  • Gaiters (diving) – Accessories used to restrict volume of a dry suit over the lower legs
  • Gas blender – Person who blends breathing gas mixtures for scuba diving and fills diving cylinders
  • Gas blending – Producing special gas mixtures to specification
  • Gas blending for scuba diving – Mixing and filling cylinders with breathing gases for use when scuba diving
  • Gas booster – Machine to increase the pressure of compressed gas
  • Gas endurance – The time a gas supply will last
  • Gas exchange – Process by which gases diffuse through a biological membrane
  • Gas extender – Type of semi-closed circuit diving rebreather
  • Gas-integrated dive computer – A dive computer that displays the pressure of breathing gas remaining in the cylinder
  • Gas laws – Scientific description of the behaviour of gases as physical conditions vary
  • Gas man – Person who controls the breathing gas supply to a surface-supplied mixed-gas diver
  • Gas man (diving) – Member of a surface-supplied diving team who operates the breathing gas panel
  • Gas matching – Ensuring that reserve breathing gas is sufficient to supply the dive buddy
  • Gas panel – Breathing gas distribution panel for surface-supplied diving
  • Gas panel operator – Member of a surface-supplied diving team who operates the breathing gas panel
  • Gas-reclaim system – Equipment to recover exhaled gas from a diver to tecover the helium content
  • Gas storage bank – Manifolded group of gas storge cylinders
  • Gas storage quad – Group of similar size high pressure cylinders
  • Gas storage tube – Large volume, high pressure gas storage cylinder
  • Gas switch – Changing the breathing gas mixture during a dive
  • Gas switching – Changing the breathing gas mixture during a dive
  • Gas toxicity – Degree of harmfulness of gases
  • Gay-Lussac's law – Relationship between pressure and temperature of a gas at constant volume

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  • Gradient factor – Method for adjusting conservatism of decompression algorithms
  • Gradient factor in decompression modelling – A way for users to adjust the conservatism of a decompression algorithm in software
  • Green Fins – Organisation in South East Asia for preservation of coral reefs by improving diver behavior
  • GROM Military Unit – Polish special forces unit
  • GRUMEC, also known as Brazilian commando frogmen – Brazilian Navy special forces diving unit
  • Guide line – Line deployed by scuba divers for navigation

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  • Gyrojet – Firearm that fires small rocket projectiles

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Subsection: Top, Ha, He, Hi, Ho, Hu, Hy

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Subsection: Top, Ic, Id, Im, In, Is, It

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  • IDA71 – Russian military rebreather for underwater and high altitude use
  • Ideal gas law – Equation of the state of a hypothetical ideal gas
  • IDRCF – International Diving Regulators and Certifiers Forum

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Subsection: Top, La, Le, Li, Lo, Lu

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Subsection: Top, Ma, Me, Mi, Mo, Mu

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  • Mechanical dead space – Space in breathing apparatus in which the breathing gas must flow in both directions
  • Mechanism of diving regulators, also known as Mechanism of the diving regulator – Arrangement and function of the components of regulators for underwater diving
  • Media diver – Professional diver working in the media sector
  • Media diving – Underwater diving in support of the media industries
  • Medical fitness to dive – The medical fitness of a person to function safely underwater under pressure
  • Medical oxygen – Oxygen used for therapeutic purposes
  • Medically fit to dive – State of a person who has no medical constraints preventing them from underwater diving
  • Membrane gas separation – Technology for splitting specific gases out of mixtures
  • Messenger line – Light line used to pull heavier cable or lower a package along a downline
  • Metabolism – Set of chemical reactions in organisms
  • Metre sea water, also known as metre seawater – Unit of pressure equal to one tenth of a bar

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  • Muck diving – Recreational diving on a loose sedimentary bottom
  • Multi-level dive – Scuba diving in consecutively shallower depth ranges on one dive
  • Muscle-memory – Consolidating a motor task into memory through repetition
  • Mushroom valve – Arrangement and function of the components of regulators for underwater diving
  • M-value (decompression) – Maximum inert gas supersaturation allowed for a tissue in decompression theory}

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