Index of underwater diving: F–K

{{Short description|Alphabetical listing of underwater diving related topics}}

{{Hatnote|See the Glossary of underwater diving terminology for definitions of technical terms, jargon, diver slang and acronyms used in underwater diving}}

{{Hatnote|See the Index of recreational dive sites for an alphabetical listing of articles about places which are recreational dive sites}}

{{Hatnote|See the Index of underwater divers for an alphabetical listing of articles about underwater divers}}

{{hatnote|See the Outline of recreational dive sites for a hierarchical listing of articles about sites used for recreational diving}}

{{Hatnote|See the Outline of underwater diving for a hierararchical listing of underwater diving related articles grouped by topical relevance}}

{{Transclude lead excerpt | 1=Index of underwater diving | paragraphs= | files=1 | fileargs= | errors=yes |more=no }}

F

{{Index of underwater diving ToC}}

Section contents: Top of section, Fa, Fe, Fi, Fl–Fn, Fo, Fr, Fu

=Fa=

  • {{annotated link|Faber Industrie S.p.A. |aka=Faber Cylinders}}
  • {{annotated link|Faceplate (diving)}}
  • {{annotated link|Fatal scuba diving incidents}}

=Fe=

Section contents: Top of section, Fa, Fe, Fi, Fl–Fn, Fo, Fr, Fu

  • {{annotated link|Feather breathing}}
  • {{annotated link|Federación Española de Actividades Subacuáticas|abbreviation=FEDAS}}
  • {{annotated link|Fédération Française d'Études et de Sports Sous-Marins|abbreviation=FFESSM}}
  • {{annotated link|Federazione Italiana Attività Subacquee|abbreviation=FIAS}}
  • {{annotated link|Feet fresh water}}
  • {{annotated link|Fenzy}}
  • {{annotated link|Maurice Fernez|Fernez, Maurice}}
  • {{annotated link|Luigi Ferraro|Ferraro, Luigi}}

=Fi=

Section contents: Top of section, Fa, Fe, Fi, Fl–Fn, Fo, Fr, Fu

  • {{annotated link|Fibre wound composite cylinder}}
  • {{annotated link|Fick's laws of diffusion}}
  • {{annotated link|William Paul Fife|Fife, William Paul}}
  • {{annotated link|Filling whip}}
  • {{annotated link|Fin retainer}}
  • {{annotated link|Finning technique}}
  • {{annotated link|Finswimming}}
  • {{annotated link|Finswimming at the 2001 World Games}}
  • {{annotated link|Finswimming at the 2001 World Games – Men's 50 m apnoea}}
  • {{annotated link|Finswimming at the 2005 World Games – Men's 50 m apnoea}}
  • {{annotated link|Finswimming at the 2009 Asian Indoor Games}}
  • {{annotated link|Finswimming at the 2009 World Games}}
  • {{annotated link|Finswimming at the 2009 World Games – Men's 50 m apnoea}}
  • {{annotated link|Finswimming at the 2011 SEA Games}}
  • {{annotated link|Finswimming at the 2021 SEA Games}}
  • {{annotated link|Finswimming at the 2023 SEA Games}}
  • {{annotated link|Finswimming at the World Games}}
  • {{annotated link|Finswimming in Australia}}
  • {{annotated link|Finswimming in the United Kingdom}}
  • {{annotated link|Finswimming in the United States}}
  • {{annotated link|Finswimming World Championships}}
  • {{annotated link|First aid}}
  • {{annotated link|George R. Fischer|Fischer, George R.}}
  • {{annotated link|Fitness to dive|aka=fitness for diving}}

=Fl–Fn=

Section contents: Top of section, Fa, Fe, Fi, Fl–Fn, Fo, Fr, Fu

  • {{annotated link|Henry Fleuss|Fleuss, Henry}}
  • {{annotated link|Flicker fusion threshold}}
  • {{annotated link|Flushing the loop}}
  • {{annotated link|Flying after diving}}
  • {{annotated link|FNRS-2}}
  • {{annotated link|FNRS-3}}

=Fo=

Section contents: Top of section, Fa, Fe, Fi, Fl–Fn, Fo, Fr, Fu

  • {{annotated link|Force}}
  • {{annotated link|Formoza Military Unit}}
  • {{annotated link|Forward dive profile}}

=Fr=

Section contents: Top of section, Fa, Fe, Fi, Fl–Fn, Fo, Fr, Fu

  • {{annotated link|Fraction of inspired oxygen}}
  • {{annotated link|Anders Franzén|Franzén, Anders}}
  • {{annotated link|Free immersion apnea}}
  • {{annotated link|Free-flow diving helmet|aka=free-flow helmet}}
  • {{annotated link|Freediving}}
  • {{annotated link|Freediving blackout}}
  • {{annotated link|Freediving blackout of ascent}}
  • {{annotated link|Freediving computer}}
  • {{annotated link|Freediving training agency|aka=freediver training agency}}
  • {{annotated link|Freeflow}}
  • {{annotated link|Free-flow breathing apparatus}}
  • {{annotated link|French commando frogmen}}
  • {{annotated link|Frenzel maneuver}}
  • {{annotated link|Fresh gas flow (disambiguation)}}
  • {{annotated link|Freshwater diving}}
  • {{annotated link|Freshwater diving environment}}
  • {{annotated link|Frog kick}}
  • {{annotated link|Frogman}}
  • {{annotated link|Frogman Corps (Denmark)}}
  • {{annotated link|FROGS (Full Range Oxygen Gas System)}}
  • {{annotated link|fsw (pressure)}}

=Fu=

Section contents: Top of section, Fa, Fe, Fi, Fl–Fn, Fo, Fr, Fu

  • {{annotated link|Fuerzas Especiales}}
  • {{annotated link|Fukuryu}}
  • {{annotated link|Full-face diving mask}}
  • {{annotated link|Full facepiece}}
  • {{annotated link|Full-face snorkel mask}}
  • {{annotated link|Full ocean depth}}

G

{{Index of underwater diving ToC}}

Section contents: Top of section, Ga, Ge, Gl, Go–Gp, Gr, Gu, Gy

=Ga=

  • {{annotated link|Gaiters (diving)}}
  • {{annotated link|Gap line|aka=jump line}}
  • {{annotated link|Gas blender}}
  • {{annotated link|Gas blender level 1|aka=nitrox blender}}
  • {{annotated link|Gas blender level 2|aka=trimix blender}}
  • {{annotated link|Gas blending}}
  • {{annotated link|Gas blending for scuba diving}}
  • {{annotated link|Gas booster}}
  • {{annotated link|Gas capacity}}
  • {{annotated link|Gas cylinder}}
  • {{annotated link|Gas cylinder bundle|aka=gas cylinder quad}}
  • {{annotated link|Gas diving}}
  • {{annotated link|Gas endurance}}
  • {{annotated link|Gas exchange}}
  • {{annotated link|Gas extender}}
  • {{annotated link|Gas-integrated dive computer}}
  • {{annotated link|Gas integration (diving)|Gas integration}}
  • {{annotated link|Gas laws}}
  • {{annotated link|Gas man (diving)|Gas man|aka=gas panel operator}}
  • {{annotated link|Gas matching}}
  • {{annotated link|Gas panel}}
  • {{annotated link|Gas panel operator|aka=gas man}}
  • {{annotated link|Gas-reclaim system}}
  • {{annotated link|Gas storage bank}}
  • {{annotated link|Gas storage cylinder}}
  • {{annotated link|Gas storage quad}}
  • {{annotated link|Gas storage tube}}
  • {{annotated link|Gas switch}}
  • {{annotated link|Gas switching}}
  • {{annotated link|Gas toxicity}}
  • {{annotated link|Gay-Lussac's law}}

=Ge=

  • {{annotated link|German commando frogmen}}

=Gl=

Section contents: Top of section, Ga, Ge, Gl, Go–Gp, Gr, Gu, Gy

  • {{annotated link|Global Explorer ROV}}
  • {{annotated link|Global Underwater Explorers|abbreviation=GUE}}
  • {{annotated link|Glossary of breathing apparatus terminology}}
  • {{annotated link|Glossary of underwater diving terminology|aka=Glossary of underwater diving terms or Glossary of SCUBA diving}}
  • {{annotated link|Glossary of underwater diving terminology: A–C}}
  • {{annotated link|Glossary of underwater diving terminology: D–G}}
  • {{annotated link|Glossary of underwater diving terminology: H–O}}
  • {{annotated link|Glossary of underwater diving terminology: P–S}}
  • {{annotated link|Glossary of underwater diving terminology: T–Z}}

=Go–Gp=

Section contents: Top of section, Ga, Ge, Gl, Go–Gp, Gr, Gu, Gy

  • {{annotated link|Goldfinder|Goldfinder}}
  • {{annotated link|Gold line (diving)}}
  • {{annotated link|Gold Rush: White Water}}
  • {{annotated link|Goldfish-class ROUV}}
  • {{annotated link|Goldman Interconnected Compartment Model}}
  • {{annotated link|Goodman handle}}
  • {{annotated link|Gorski (diving helmet)}}
  • {{annotated link|GPS sonobuoy|aka=GPS intelligent buoy}}

=Gr=

Section contents: Top of section, Ga, Ge, Gl, Go–Gp, Gr, Gu, Gy

  • {{annotated link|Gradient factor}}
  • {{annotated link|Gradient factor in decompression modelling}}
  • {{annotated link|Green Fins}}
  • {{annotated link|GROM Military Unit}}
  • {{annotated link|GRUMEC|aka=Brazilian commando frogmen}}

=Gu=

  • {{annotated link|Guide line}}

=Gy=

  • {{annotated link|Gyrojet}}

H

{{Index of underwater diving ToC}}

Section contents: Top of section, Ha–Hb, He, Hi, Ho, Hu, Hy

=Ha–Hb=

  • {{annotated link|Haenyeo}}
  • {{annotated link|Halcyon Dive Systems}}
  • {{annotated link|Halcyon PVR-BASC}}
  • {{annotated link|Halcyon RB80}}
  • {{annotated link|John Scott Haldane|Haldane, John Scott}}
  • {{annotated link|Haldane's decompression model}}
  • {{annotated link|Half + 15 bar}}
  • {{annotated link|Half mask}}
  • {{annotated link|Half time (physics)}}
  • {{annotated link|Halocline}}
  • {{annotated link|Robert William Hamilton Jr.|Hamilton, Robert William Jr.}}
  • {{annotated link|Hand-held sonar}}
  • {{annotated link|Hand-off a cylinder}}
  • {{annotated link|Hand-off cylinder}}
  • {{annotated link|Hang-off profile}}
  • {{annotated link|Hans Hass Award}}
  • {{annotated link|Hans Hass}}
  • {{annotated link|Harasib Cave}}
  • {{annotated link|Hawaiian sling}}
  • {{annotated link|Hazard}}
  • {{annotated link|Hazard analysis|abbreviation=HAZID}}
  • {{annotated link|Hazard elimination}}

  • {{annotated link|Hazard substitution}}
  • {{annotated link|Hazardous Materials Identification System}}
  • {{annotated link|Hazards of the aquatic environment}}
  • {{annotated link|Hazards of the diving environment}}
  • {{annotated link|Hazards of the specific diving environment}}
  • {{annotated link|Hazmat diver}}
  • {{annotated link|Hazmat diving}}
  • {{annotated link|Hazmat diving decontamination}}
  • {{annotated link|H-BRUV}}

=He=

Section contents: Top of section, Ha–Hb, He, Hi, Ho, Hu, Hy

  • {{annotated link|Health and Safety Executive|abbreviation=HSE}}
  • {{annotated link|Healthways (scuba gear company)}}
  • {{annotated link|Heckler & Koch P11}}
  • {{annotated link|Heinke (diving equipment manufacturer)}}
  • {{annotated link|HeinrichsWeikamp}}
  • {{annotated link|Helgoland Habitat}}
  • {{annotated link|Heliair}}
  • {{annotated link|Helicopter Aircrew Breathing Device|aka=helicopter escape set}}
  • {{annotated link|Helicopter turn}}
  • {{annotated link|Heliox}}
  • {{annotated link|Heliox diving}}
  • {{annotated link|Helium analyzer|aka=helium analyser}}
  • {{annotated link|Helium reclaim system}}
  • {{annotated link|Helium release valve}}
  • {{annotated link|Helium speech unscrambler}}
  • {{annotated link|Helium tremors}}
  • {{annotated link|Helix Energy Solutions Group}}
  • {{annotated link|Helmet squeeze}}
  • {{annotated link|Helmet weight}}
  • {{annotated link|Henry Valence Hempleman|Hempleman, Henry Valence}}
  • {{annotated link|Henry's law}}

=Hi=

Section contents: Top of section, Ha–Hb, He, Hi, Ho, Hu, Hy

  • {{annotated link|Hierarchy of hazard controls}}
  • {{annotated link|High energy coast}}
  • {{annotated link|High energy underwater environment}}
  • {{annotated link|High pressure breathing air compressor}}
  • {{annotated link|High-pressure gas storage cylinder|aka=high pressure storage cylinder}}
  • {{annotated link|High-pressure nervous syndrome|aka=high-pressure neurological syndrome}}
  • {{Annotated link|High-pressure water jetting}}
  • {{annotated link|Leonard Hill (physiologist)|Hill, Leonard Erskine}}
  • {{annotated link|Brian Andrew Hills|Hills, Brian Andrew}}

  • {{annotated link|History of decompression research and development}}
  • {{annotated link|History of dive computers}}
  • {{annotated link|History of Diving Museum}}
  • {{annotated link|History of scuba diving}}
  • {{annotated link|History of underwater diving}}

=Ho=

Section contents: Top of section, Ha–Hb, He, Hi, Ho, Hu, Hy

  • {{annotated link|Hog looped}}
  • {{annotated link|Hogarthian scuba configuration}}
  • {{annotated link|Hoke valve}}
  • {{annotated link|Hookah (diving)}}
  • {{annotated link|Hookah diving}}
  • {{annotated link|Felix Hoppe-Seyler|Hoppe-Seyler, Felix}}
  • {{annotated link|Hot stab}}
  • {{annotated link|Hot water suit}}
  • {{annotated link|Hot water system (diving)}}

=Hu=

Section contents: Top of section, Ha–Hb, He, Hi, Ho, Hu, Hy

  • {{annotated link|Karl E. Huggins|Huggins, Karl E.}}
  • {{annotated link|Human factors in diving equipment design}}
  • {{annotated link|Human factors in diving safety}}
  • {{annotated link|Human factors in the design of diving equipment}}
  • {{annotated link|Human physiology of underwater diving|aka=human physiology of diving}}
  • {{annotated link|Human torpedo}}

=Hy=

Section contents: Top of section, Ha–Hb, He, Hi, Ho, Hu, Hy

  • {{annotated link|Hydraulic chainsaw}}
  • {{annotated link|Hydreliox}}
  • {{annotated link|Hydrocleaning}}
  • {{annotated link|Hydrogen narcosis}}
  • {{annotated link|Hydrogen sulfide}}
  • {{annotated link|Hydrophobe}}
  • {{annotated link|HydroSpace Engineering}}
  • {{annotated link|Hydrostatic pressure}}
  • {{annotated link|Hydrostatic test}}
  • {{annotated link|Hydrox (breathing gas)}}
  • {{annotated link|Hyperbaric escape capsule}}
  • {{annotated link|Hyperbaric evacuation}}
  • {{annotated link|Hyperbaric evacuation and rescue}}
  • {{annotated link|Hyperbaric evacuation facilities}}
  • {{annotated link|Hyperbaric evacuation system}}
  • {{annotated link|Hyperbaric evacuation unit}}
  • {{annotated link|Hyperbaric lifeboat}}
  • {{annotated link|Hyperbaric medicine}}
  • {{annotated link|Hyperbaric nursing}}
  • {{annotated link|Hyperbaric oxygen therapy chamber}}
  • {{annotated link|Hyperbaric oxygen treatment}}
  • {{annotated link|Hyperbaric oxygen treatment table}}
  • {{annotated link|Hyperbaric reception facility}}
  • {{annotated link|Hyperbaric rescue}}
  • {{annotated link|Hyperbaric rescue chamber}}
  • {{annotated link|Hyperbaric rescue vessel}}
  • {{annotated link|Hyperbaric speech distortion}}
  • {{annotated link|Hyperbaric stretcher}}
  • {{annotated link|Hyperbaric transport}}
  • {{annotated link|Hyperbaric transportation}}
  • {{annotated link|Hyperbaric treatment}}
  • {{annotated link|Hyperbaric treatment schedules}}
  • {{annotated link|Hyperbaric treatment tables}}
  • {{annotated link|Hyperbaric welding}}
  • {{annotated link|Hypercapnia}}
  • {{annotated link|Hyperoxia}}
  • {{annotated link|Hyperoxic breathing gas}}
  • {{annotated link|Hyperoxic myopia}}
  • {{annotated link|Hyperthermia}}
  • {{annotated link|Hyperventilation}}
  • {{annotated link|Hyperventilation-induced blackout}}
  • {{annotated link|Hypobaric decompression}}
  • {{annotated link|Hypocapnia}}
  • {{annotated link|Hypothermia}}
  • {{annotated link|Hypoventilation}}
  • {{annotated link|Hypoxia (medicine)}}
  • {{annotated link|Hypoxia of ascent}}
  • {{annotated link|Hypoxic blackout}}
  • {{annotated link|Hypoxic breathing gas}}
  • {{annotated link|Hypoxic trimix}}
  • {{annotated link|Hypoxic trimix diver}}

I

{{Index of underwater diving ToC}}

Section contents: Top of section, Ic, Id, Im, In, Ir–Is, It

=Ic=

  • {{annotated link|Ice diving}}
  • {{annotated link|Ichthyander Project}}
  • {{annotated link|Ictineu 3}}

=Id=

Section contents: Top of section, Ic, Id, Im, In, Ir–Is, It

  • {{annotated link|IDA71}}
  • {{annotated link|Ideal gas law}}
  • {{annotated link|IDRCF}}

=Im=

Section contents: Top of section, Ic, Id, Im, In, Ir–Is, It

  • {{annotated link|International Marine Contractors Association|IMCA}}
  • {{annotated link|IMCA Code of Practice for Offshore Diving|IMCA Code of Practice for Offshore Diving|aka=IMCA D014}}
  • {{annotated link|IMCA Diving Supervisor's Manual|IMCA Diving Supervisor's Manual|aka=IMCA D022}}
  • {{annotated link|IMCA Safety flash}}
  • {{annotated link|Immersion finswimming}}
  • {{annotated link|Immersion finswimming with breathing apparatus}}
  • {{annotated link|Immersion pulmonary oedema}}
  • {{annotated link|Immersion response}}

=In=

Section contents: Top of section, Ic, Id, Im, In, Ir–Is, It

  • {{annotated link|Incident pit}}

  • {{annotated link|Independent doubles|aka=independent twin cylinders}}
  • {{annotated link|Index of recreational dive sites}}
  • {{annotated link|Index of underwater divers}}
  • {{annotated link|Index of underwater diving}}
  • {{annotated link|Industrie Werke Karlsruhe Aktiengesellschaft|abbreviation=IWKA}}
  • {{annotated link|Inert gas counterdiffusion}}
  • {{annotated link|Ingassing}}
  • {{annotated link|Inherent unsaturation}}
  • {{annotated link|Inland dive site}}
  • {{annotated link|Inland diving}}
  • {{annotated link|Inner ear barotrauma}}
  • {{annotated link|Inner ear decompression sickness}}
  • {{annotated link|Inshore diving}}

  • {{annotated link|Instinctive drowning response}}
  • {{annotated link|Stig Insulán|Insulán, Stig}}
  • {{annotated link|Integrated Diver Display Mask}}
  • {{annotated link|Integrated weight system}}
  • {{annotated link|Integrated weights}}
  • {{annotated link|Intelligent Water class AUV}}
  • {{annotated link|International Association for Handicapped Divers|abbreviation=IAHD}}
  • {{annotated link|International Association of Nitrox and Technical Divers|abbreviation=IANTD}}

  • {{annotated link|International Bluewater Spearfishing Records Committee}}
  • {{annotated link|International Coral Reef Society}}
  • {{annotated link|International Divers Alert Network}}
  • {{annotated link|International Diving Institute}}
  • {{annotated link|International Diving Regulators and Certifiers Forum|aka=International Diving Regulators Forum|abbreviation=IDRCF}}
  • {{annotated link|International Diving Schools Association|abbreviation=IDSA}}
  • {{annotated link|International Life Saving Federation}}
  • {{annotated link|International Marine Contractors Association|abbreviation=IMCA}}
  • {{annotated link|International Organization for Standardization|abbreviation=ISO}}
  • {{annotated link|International Scuba Diving Hall of Fame}}
  • {{annotated link|International Submarine Escape and Rescue Liaison Office}}
  • {{annotated link|International Underwater Cave Rescue and Recovery}}
  • {{annotated link|Interspiro}}
  • {{annotated link|Interspiro DCSC}}
  • {{annotated link|Intervention AUV}}
  • {{annotated link|Intestinal squeeze}}
  • {{annotated link|Introductory diving}}
  • {{annotated link|Introductory scuba experience}}
  • {{annotated link|Investigation of diving accidents}}
  • {{annotated link|In-water cleaning}}
  • {{annotated link|In-water recompression}}
  • {{annotated link|In-water surface cleaning}}
  • {{annotated link|In-water recompression}}

=Ir–Is=

Section contents: Top of section, Ic, Id, Im, In, Ir–Is, It

  • {{annotated link|iRobot Seaglider}}
  • {{annotated link|iSimangaliso Marine Protected Area}}
  • {{annotated link|Isobaric counterdiffusion}}
  • {{annotated link|Isolation manifold}}
  • {{annotated link|Isolation-manifolded twin cylinders|aka=isolation-manifolded twin set}}
  • {{annotated link|ISO 24801 Recreational diving services — Requirements for the training of recreational scuba divers}}
  • {{annotated link|ISO recreational diving standard}}
  • {{annotated link|ISO recreational diving training standards}}
  • {{annotated link|Israeli Diving Federation|abbreviation=TIDF}}

=It=

  • {{annotated link|Italian auxiliary ship Olterra}}

J

{{Index of underwater diving ToC}}

  • {{annotated link|Jacket harness}}
  • {{annotated link|Jackstay}}
  • {{annotated link|Jackstay (diving)}}
  • {{annotated link|Jackstay search}}
  • {{annotated link|Jagdkommando}}
  • {{annotated link|JAGO (German research submersible)}}
  • {{annotated link|Jednostka Wojskowa Komandosów|aka=Commandos Military Unit}}
  • {{annotated link|Jersey upline}}
  • {{annotated link|Jetsam Technologies}}
  • {{annotated link|JIM suit}}
  • {{annotated link|Job safety analysis|abbreviation=JSA}}
  • {{annotated link|Jocking harness|aka=jocking strap}}
  • {{annotated link|Johnson Sea Link accident}}
  • {{annotated link|Jonline}}
  • {{annotated link|Josef Heiser}}
  • {{annotated link|Jump camera}}
  • {{annotated link|Jump jacket}}
  • {{annotated link|Jump line|aka=gap line}}
  • {{annotated link|Jump spool}}
  • {{annotated link|Junior Open Water Diver }}
  • {{annotated link|Just culture}}
  • {{annotated link|J-valve}}

K

{{Index of underwater diving ToC}}

  • {{annotated link|Kaikō ROV}}
  • {{annotated link|Kaşif ROUV}}
  • {{annotated link|Karl Heinrich Klingert|Klingert, Karl Heinrich}}
  • {{annotated link|Karst Underwater Research}}
  • {{annotated link|Kayak diving}}
  • {{annotated link|Keel weight (diving)}}
  • {{annotated link|Kelly (gas storage)}}
  • {{annotated link|Kilsby sinkhole}}
  • {{annotated link|Kimiuo Aisek Memorial Museum}}
  • {{annotated link|KISS Classic}}
  • {{annotated link|KISS GEM}}
  • {{annotated link|KISS Rebreathers}}
  • {{annotated link|KISS Sidekick}}
  • {{annotated link|KISS Sidewinder}}
  • {{annotated link|Kiss Spirit}}
  • {{annotated link|KISS (rebreather)}}
  • {{annotated link|Kommando Spezialkräfte Marine|aka=Kampfschwimmer}}
  • {{annotated link|Kongsberg Mesotech}}
  • {{annotated link|Konsul-class submersible}}
  • {{annotated link|KOPASKA}}
  • {{annotated link|Peter Kreeft (diver)|Kreeft, Peter}}
  • {{annotated link|Kronan (ship)}}
  • {{annotated link|Kursk submarine disaster salvage operation}}
  • {{annotated link|K-valve}}

{{Index of underwater diving ToC}}

See also

{{Sister project links|Underwater diving}}

  • {{annotated link|Glossary of underwater diving terminology}}

{{Underwater diving}}

{{Index footer}}

{{DEFAULTSORT:Index of underwater diving F}}

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Underwater diving