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Breathing gas mixture of hydrogen, helium, and oxygen
Hydreliox or helihydrox is a breathing gas mixture of hydrogen, helium, and oxygen. It is used primarily for research and scientific deep diving, usually
Hydreliox
Breathing gas mixture experimentally used for very deep diving
breathing gas mixtures based on hydrogen, called hydrox (hydrogen-oxygen) or hydreliox (hydrogen-helium-oxygen). In July 2012, after about a year of preparation
Hydrox_(breathing_gas)
French offshore diving contractor
started work with heliox (a breathing gas mixture of helium and oxygen) and hydreliox (an exotic breathing gas mixture of helium, oxygen and hydrogen) mixtures
Compagnie maritime d'expertises
Compagnie_maritime_d'expertises
Psychotropic state induced by breathing hydrogen at high partial pressures
where divers dived to 500 m (1,600 ft) with a hydrogen–helium–oxygen (hydreliox) mixture containing 49% hydrogen, it was found that while the narcotic
Hydrogen_narcosis
Underwater diving to a depth beyond the norm
"Hydra 10" experiment simulated a dive in an onshore hyperbaric chamber with hydreliox. Théo Mavrostomos spent two hours at a simulated depth of 701 metres (2
Deep_diving
Semi-submersible offshore drilling rig
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Byford_Dolphin
Evidence of physiological disorders resulting from underwater diving
then causes high pressure nervous syndrome. More exotic mixtures such as hydreliox, a hydrogen–helium–oxygen mixture, are used at extreme depths to counteract
List of signs and symptoms of diving disorders
List_of_signs_and_symptoms_of_diving_disorders
German filmmaker (1902–2003)
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Leni_Riefenstahl
Gas used for human respiration
Hydreliox is a mixture of oxygen, helium, and hydrogen and is used for dives below 130 metres in commercial diving. Experimental work using hydreliox
Breathing_gas
Disorder from breathing helium based gas at high ambient pressure
helium–oxygen mixture, such as nitrogen (creating trimix) or hydrogen (producing hydreliox), suppresses the neurological effects. Alcohol, anesthetics, and anticonvulsant
High-pressure nervous syndrome
High-pressure_nervous_syndrome
Australian conservationist (1962–2006)
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Steve_Irwin
English broadcaster and natural historian (born 1926)
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
David_Attenborough
Breathing gas mixed from helium and oxygen
dry-suit inflation Nitrox – Breathing gas, mixture of nitrogen and oxygen Hydreliox – Breathing gas mixture of hydrogen, helium, and oxygen Hydrox – Breathing
Heliox
French oceanographer and author (1910–1997)
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Jacques_Cousteau
Tabulated data to facilitate safe diving ascents
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Decompression_tables
British Army Air Corps officer and astronaut (born 1972)
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Tim_Peake
2006 animal encounter accident
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Death_of_Steve_Irwin
U.S. Navy's special operations force
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
United_States_Navy_SEALs
Equipment designed to help protect an individual from hazards
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Personal_protective_equipment
Set of detailed instructions to assist in workplace safety
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Standard_operating_procedure
Human body core temperature below 35 °C (95 °F)
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Hypothermia
Irish safety freediver (1977-2017)
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Stephen_Keenan
US government scientific agency
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
National Oceanic and Atmospheric Administration
National_Oceanic_and_Atmospheric_Administration
Underwater diving breathing gas supplied from the surface
then causes high pressure nervous syndrome. More exotic mixtures such as hydreliox, a hydrogen–helium–oxygen mixture, are used at extreme depths to counteract
Surface-supplied_diving
Field concerned with the safety, health and welfare of people at work
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Occupational safety and health
Occupational_safety_and_health
Organ system for circulating blood in animals
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Circulatory_system
Danish maritime special operations unit
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Frogman_Corps_(Denmark)
Special forces unit of the British Army
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Special_Air_Service
Emergency first response medical treatment
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
First_aid
Severely deficient supply of oxygen
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Asphyxia
Jacques Cousteau's oceanographic research ship
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
RV_Calypso
Garment or device designed to protect a diver from the underwater environment
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Diving_suit
British cave diver who specialises in rescues
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Rick_Stanton
Hyperbaric pressure vessel for human occupancy used in diving operations
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Diving_chamber
American novelist and underwater explorer (1931–2020)
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Clive_Cussler
American writer, botanist, and SCUBA and aviation enthusiast
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Fred_M._Roberts
British volunteer cave rescue diver
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
John_Volanthen
Acoustic sensing method
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Sonar
Crewed deep-ocean research submersible
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
DSV_Alvin
Involuntary contraction of the vocal folds restricting inhalation
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Laryngospasm
Injury due to pressure difference between gas filled space and adjoining tissue
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Barotrauma
Crewed full ocean depth rated submersible
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
DSV_Limiting_Factor
Female divers of Jeju, South Korea
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Haenyeo
American mechanical engineer and NASA astronaut (born 1969)
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Karen_Nyberg
English science fiction writer (1917–2008)
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Arthur_C._Clarke
Urgent removal of people from an area of imminent or ongoing threat
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Emergency_evacuation
Safe isolation of dangerous equipment during maintenance or testing
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Lockout–tagout
Subsea engineering and applied technology company
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Oceaneering_International
Change in sea level due to gravity
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Tide
Cylindrical container for storing pressurised gas
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Gas_cylinder
Submerged ridge of rock, coral or other material
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Reef
Perception of one's environment
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Situation_awareness
Sudden overwhelming sensation of fear
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Panic
Unplanned drop in the pressure of a sealed system
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Uncontrolled_decompression
Worldwide rule- and record-keeping body for competitive breath-hold events
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
AIDA_International
Estimation of risk associated with exposure to a given set of hazards
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Risk_assessment
Diver who remains underwater for 24 hours or more
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Aquanaut
Scientific study of ocean life
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Marine_biology
Death of bone tissue due to interruption of the blood supply
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Avascular_necrosis
American astronaut, circled the Moon in 2026 (born 1975)
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Reid_Wiseman
British ocean liner (1907–1915)
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
RMS_Lusitania
U.S. Navy officer and NASA astronaut (born 1965)
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Sunita_Williams
Diving incident in the Maldives
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
2026 Dhekunu Kandu cave diving incident
2026_Dhekunu_Kandu_cave_diving_incident
Ukrainian synchronized swimmer (born 1992)
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Kateryna_Sadurska
French diver and cinematographer (1940–1979)
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Philippe_Cousteau
Submersible that traveled to the Challenger Deep
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Deepsea_Challenger
Underwater assault rifle
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
QBS-06
2019 maritime disaster
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Sinking_of_MV_Conception
2018 international rescue mission in Thailand
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Tham_Luang_cave_rescue
Firearm firing gyroscopic rockets in the 1960s
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Gyrojet
Breathing gas consisting of oxygen, helium and nitrogen
dry-suit inflation Heliox – Breathing gas mixed from helium and oxygen Hydreliox – Breathing gas mixture of hydrogen, helium, and oxygen Hydrox – Breathing
Trimix_(breathing_gas)
Physiological responses to immersion of air-breathing vertebrates
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Diving_reflex
Anglo-Irish scientist (1627–1691)
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Robert_Boyle
Narcotic effects of respiratory nitrogen
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Nitrogen_narcosis
Rebreather system for escaping sunken submarines
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Momsen_lung
Underwater diving without breathing apparatus
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Freediving
American engineer and NASA astronaut
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Mark_T._Vande_Hei
Medical condition of lack of oxygen in the tissues
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Hypoxia_(medicine)
Spread of planktonic algae in water
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Algal_bloom
Elevated body temperature due to failed thermoregulation
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Hyperthermia
Disorder caused by dissolved gases forming bubbles in tissues
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Decompression_sickness
Line of watches by Rolex
used during this scientific record dive, where a hydrogen-helium-oxygen (hydreliox) gas mixture was used as breathing gas, was a Rolex Sea-Dweller 166600
Rolex_Sea-Dweller
Tactical scuba diving unit
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Russian_commando_frogmen
Firearms that can be effectively fired underwater
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Underwater_firearm
Techniques requiring specific equipment and procedures
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Modes_of_underwater_diving
Diving mode and decompression technique
limit fire risk. A breathing gas mixture of oxygen, helium and hydrogen (hydreliox) was developed for use at extreme diving pressures to reduce the effects
Saturation_diving
Professional diving on industrial projects
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Commercial_diving
Italian freediver (born 1992)
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Alessia_Zecchini
Chinese military unit
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
7th Marine Brigade (PLA Navy Marine Corps)
7th_Marine_Brigade_(PLA_Navy_Marine_Corps)
American freediver who died while attempting to set a record (1981–2013)
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Nicholas_Mevoli
Gaseous diffusion through body tissue at constant total pressure
developed itching followed by joint pain. Saturation divers breathing hydreliox switched to a heliox mixture and developed symptoms of decompression sickness
Isobaric_counterdiffusion
Manned wet submersible for deploying naval special forces
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
SEAL_Delivery_Vehicle
Duplication of critical components to increase reliability of a system
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Redundancy_(engineering)
Unstable wave
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Breaking_wave
Austrian freediver and world record holder
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Herbert_Nitsch
Russian freediver (born 1987)
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Alexey_Molchanov
Equipment used by divers to facilitate decompression
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Decompression_equipment
South African diver (1974–1994)
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Deon_Dreyer
US Marine Corps special forces unit
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Marine_Raider_Regiment
Scuba set with variable-density buoyancy control
Bottom gas Breathing air Decompression gas Emergency gas supply Heliox Hydreliox Hydrox Nitrox Oxygen Travel gas Trimix Buoyancy and trim equipment Avelo
Avelo_diving_system
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