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Freediver training agency
Performance Freediving International (PFI) is a freediving training agency founded in 2000 by Kirk Krack. Krack coached World Champion Freedivers and Mandy-Rae
Performance Freediving International
Performance_Freediving_International
Underwater diving without breathing apparatus
freediving is recognized as a distinct discipline focusing on maximizing underwater breath hold duration, depths, or distance. Competitive freediving
Freediving
Loss of consciousness caused by cerebral hypoxia towards the end of a breath-hold dive
Freediving blackout, breath-hold blackout, or apnea blackout is a class of hypoxic blackout, a loss of consciousness caused by cerebral hypoxia towards
Freediving_blackout
Irish safety freediver (1977-2017)
freedive instructor. Keenan discovered freediving while he was holidaying in Dahab, Egypt in 2009. He later relocated to Dahab, became a freediving instructor
Stephen_Keenan
British science fiction writer (1917–2008)
kilometres (22,000 mi) above the equator is officially recognised by the International Astronomical Union as the Clarke Orbit. His 1951 book, The Exploration
Arthur_C._Clarke
Austrian freediver and world record holder
Nitsch has held 33 world records across eight freediving disciplines recognised by AIDA International and one in the traditional Greek discipline of
Herbert_Nitsch
Copper helmet with rubberised canvas diving suit and weighted boots
order. In 2016 DESCO Corporation purchased the assets of Morse Diving International and began producing Morse helmets under the A. J. Morse and Son brand
Standard_diving_dress
2018 international rescue mission in Thailand
massive operation amid intense worldwide public interest and involved international rescue teams. On 2 July, after advancing through narrow passages and
Tham_Luang_cave_rescue
U.S. Navy's special operations force
official parachute demonstrations within the Navy. A typical Leap Frogs' performance consists of six jumpers leaping out of an aircraft at an altitude of
United_States_Navy_SEALs
English broadcaster and natural historian (born 1926)
Retrieved 5 September 2021. "People | Fauna & Flora International". Fauna & Flora International. Archived from the original on 7 October 2017. Retrieved
David_Attenborough
Semi-submersible offshore drilling rig
Mondiale des Activités Subaquatiques (CMAS) Performance Freediving International (PI) Scuba Schools International (SSI) Recreational scuba certification agencies
Byford_Dolphin
Australian conservationist (1962–2006)
by his father, Bob. He achieved international fame in the late 1990s through The Crocodile Hunter, an internationally broadcast wildlife documentary series
Steve_Irwin
Worldwide rule- and record-keeping body for competitive breath-hold events
known as freediving. It sets standards for safety, comparability of Official World Record attempts and freedive education. AIDA International is the parent
AIDA_International
2025 film by James Cameron
director Aashrita Kamath. Kirk Krack, founder of Performance Freediving International, worked as a freediving trainer for the cast and crew for the underwater
Avatar:_Fire_and_Ash
German filmmaker (1902–2003)
producer Harry Sokal. Riefenstahl often made almost 700 ℛ︁ℳ︁ for each performance. She began to suffer a series of foot injuries, which led to knee surgery
Leni_Riefenstahl
Special forces unit of the British Army
development of UK special forces and the global war on terror". Review of International Studies. 35 (4). Cambridge University Press: 971–982. doi:10.1017/S0260210509990398
Special_Air_Service
Swimming underwater, breathing gas carried by the diver
appropriate for some applications. Although underwater diving in the mode of freediving has been practised for thousands of years, the history of scuba diving
Scuba_diving
Recreational scuba and freediving training and certification agency
Instructor Freediving Assistant Instructor Freediving Instructor Advanced Freediving Instructor Performance Freediving Instructor Freediving Assistant
Scuba_Schools_International
British-Caymanian-American freediver
retired from freediving. She currently resides in Austin, Texas. Tanya also has four step children residing in the UK. Streeter took up freediving at age 25
Tanya_Streeter
Recreational diver training and certification agency
International, First Response Training International, Performance Freediving International and Technical Diving International. "Who Is SDI". Retrieved 14 September
Scuba_Diving_International
Death of bone tissue due to interruption of the blood supply
positioning system Underwater acoustic communication Freediving Activities Aquathlon Apnoea finswimming Freediving Haenyeo Pearl hunting Ama Snorkeling Spearfishing
Avascular_necrosis
Medical condition of lack of oxygen in the tissues
improve sporting performance. This is not considered a medical condition. Acute cerebral hypoxia leading to blackout can occur during freediving. This is a
Hypoxia_(medicine)
Severely deficient supply of oxygen
after asphyxia. Research by Ola Didrik Saugstad and others led to new international guidelines on newborn resuscitation in 2010, recommending the use of
Asphyxia
Perception of one's environment
using performance and behavioral measures of SA, as described next. Performance measures infer SA from the end result (i.e., task performance outcomes)
Situation_awareness
Disorder caused by dissolved gases forming bubbles in tissues
exposure and the magnitude of pressure, whereas AGE depends entirely on the performance of the ascent. In many cases, it is not possible to distinguish between
Decompression_sickness
American engineer, vintner, and former NASA astronaut
community contributions (1999) U.S. Department of Energy "Outstanding Performance Commendation" (2000) NASA Service Awards (2002, 2003) Lawrence Livermore
José_M._Hernández
British ocean liner (1907–1915)
(31 December 1995). "San Remo Manual on International Law Applicable to Armed Conflict at Sea". International Committee of the Red Cross. Archived from
RMS_Lusitania
Hunting for fish using a spear
are essential for freediving form. The types of fins used by SCUBA divers are generally shorter, bulky, and not favored for freediving. SCUBA diving fins
Spearfishing
Human body core temperature below 35 °C (95 °F)
"'Terminal burrowing behaviour'—a phenomenon of lethal hypothermia". International Journal of Legal Medicine. 107 (5): 250–6. doi:10.1007/BF01245483. PMID 7632602
Hypothermia
Female divers of Jeju, South Korea
haenyeo consist of a wetsuit, diving mask, fins, gloves, chest weights (or freediving weight belts, to assist diving), an L-shaped weeding hoe, and a net attached
Haenyeo
Equipment used to facilitate underwater diving
regulator(s) Rebreather diving, closed-circuit or semi-closed-circuit scuba Freediving or breathhold diving, where the diver completes the dive on a single breath
Diving_equipment
International trade association for the marine contracting industry
International Marine Contractors Association (IMCA) is a leading international trade association for the marine contracting industry. It is a not for profit
International Marine Contractors Association
International_Marine_Contractors_Association
Cayman Islands freediver (born 1970)
holder for the Cayman Islands in the sport of freediving. Collett started his training in apnea and freediving in August 2016 with the goal of being the first
Richard_Collett
Technique for equalising pressure in the middle ears
are also reports of syncope, chest pain, and arrhythmias due to the performance of the maneuver, so caution is necessary for patients with preexisting
Valsalva_maneuver
Subsea engineering and applied technology company
Oceaneering International, Inc. is a subsea engineering and applied technology company based in Houston, Texas, U.S. that provides engineered services
Oceaneering_International
Change in sea level due to gravity
C-13: Chapter 5 – Water Levels and Flow" (PDF). International Hydrographic Organization. Monaco: International Hydrographic Bureau. May 2005. Retrieved 3 January
Tide
American novelist and underwater explorer (1931–2020)
television commercials, many of which won international awards including an award at the Cannes Lions International Advertising Festival. After the publication
Clive_Cussler
Special operations unit of the Israeli Navy
wounded. Seven commandos were also wounded, two of them seriously. International condemnation of Shayetet 13's actions followed. Subsequently, Shayetet
Shayetet_13
Crewed full ocean depth rated submersible
'Full-Ocean Depth'". Titanium Today. No. 6 (2022 All Markets ed.). International Titanium Association. pp. 14–15. Retrieved 25 June 2023. Initially,
DSV_Limiting_Factor
Royal Navy frogman and MI6 diver
positioning system Underwater acoustic communication Freediving Activities Aquathlon Apnoea finswimming Freediving Haenyeo Pearl hunting Ama Snorkeling Spearfishing
Lionel_Crabb
Tactical scuba diver
uk. New Histories. 21 May 2011. Retrieved 12 March 2017. Reports of International Arbitral Awards : Case concerning the differences between New Zealand
Frogman
French oceanographer and author (1910–1997)
waters of Crete. In 1977, together with Peter Scott, he received the UN International Pahlavi Environment prize. On 28 June 1979, while the Calypso was on
Jacques_Cousteau
Acoustic sensing method
and their characteristics were different enough to impair the array's performance. The policy to allow repair of individual transducers was then sacrificed
Sonar
USMC deep reconnaissance unit
Mondiale des Activités Subaquatiques (CMAS) Performance Freediving International (PI) Scuba Schools International (SSI) Recreational scuba certification agencies
United States Marine Corps Force Reconnaissance
United_States_Marine_Corps_Force_Reconnaissance
Directional mass flow of oceanic water
to the meridional overturning circulation, (MOC). Since the 2000s an international program called Argo has been mapping the temperature and salinity structure
Ocean_current
Unplanned drop in the pressure of a sealed system
or compression Time of useful consciousness – Duration of effective performance in a hypoxic environment Notable exceptions include the Airbus A380,
Uncontrolled_decompression
Italian freediver (born 1992)
CMAS FREEDIVING OUTDOOR WORLD CHAMPIONSHIP". Molchanovs. Archived from the original on 12 November 2021. Retrieved 12 November 2021. "CMAS Freediving Outdoor
Alessia_Zecchini
Injury due to pressure difference between gas filled space and adjoining tissue
November 2016 – via Southern African Legal Information Institute. "International Diver Training Certification: Diver Training Standards, Revision 4"
Barotrauma
Pirate Blackbeard's ship
Mondiale des Activités Subaquatiques (CMAS) Performance Freediving International (PI) Scuba Schools International (SSI) Recreational scuba certification agencies
Queen_Anne's_Revenge
Techniques requiring specific equipment and procedures
and freediving; these categories overlap considerably. Several competitive underwater sports are practised without breathing apparatus. Freediving excludes
Modes_of_underwater_diving
Set of detailed instructions to assist in workplace safety
research, the International Council for Harmonisation (ICH) defines SOPs as "detailed, written instructions to achieve uniformity of the performance of a specific
Standard_operating_procedure
Stationary diving discipline of holding breath underwater
individual records. Shallow water blackout Freediving Underwater diving portal McKie, N (2004). "Freediving in cyberspace". Journal of the South Pacific
Static_apnea
Organ system for circulating blood in animals
medicine dealing with the heart Cardiovascular drift Cardiac cycle – Performance of the human heart Vital heat Cardiac muscle – Muscular tissue of heart
Circulatory_system
Six-round amphibious revolver for naval use
positioning system Underwater acoustic communication Freediving Activities Aquathlon Apnoea finswimming Freediving Haenyeo Pearl hunting Ama Snorkeling Spearfishing
AAI_underwater_revolver
2006 animal encounter accident
feel bitterness towards them. List of entertainers who died during a performance List of unusual deaths in the 21st century "Widow: 'Croc Hunter' thought
Death_of_Steve_Irwin
Special forces unit of the Royal Navy
September 1999, about 20 SBS members contributed to the Australian-led International Force for East Timor (INTERFET) in East Timor. Together with the Australian
Special_Boat_Service
Toxic effects of carbon monoxide
1989). "Short-term effects of carbon monoxide exposure on the exercise performance of subjects with coronary artery disease". The New England Journal of
Carbon_monoxide_poisoning
Outcrop of rock in the sea formed by the growth and deposit of stony coral skeletons
from the original (PDF) on 23 May 2013. Ferse, S.C.A. (2010). "Poor Performance of Corals Transplanted onto Substrates of Short Durability". Restoration
Coral_reef
Pathological, often painful, involuntary muscle contraction
positioning system Underwater acoustic communication Freediving Activities Aquathlon Apnoea finswimming Freediving Haenyeo Pearl hunting Ama Snorkeling Spearfishing
Skeletal_muscle_cramp
Garment worn to provide thermal protection while wet
(2004). Open Water Diver manual (in Dutch) (1st ed.). Scuba Schools International GmbH. pp. 1–9. ISBN 1-880229-95-1. Bardy, Erik; Mollendorf, Joseph;
Wetsuit
Stretch garment for protection from abrasion, UV and stings
watersports including surfing, canoe polo, scuba diving, snorkeling, freediving, wakeboarding, bodysurfing, bodyboarding, windsurfing, kitesurfing, kayaking
Rash_guard
Agencies which issue certification for competence in diving skills
Professional Scuba Schools SSI Freediving – Recreational scuba and freediving training and certification agency RAID World Series Freediving – Recreational diver
List of diver certification organizations
List_of_diver_certification_organizations
Respiratory impairment caused by submersion in liquid
populations. Some additional causes of drowning can also happen during freediving activities: Ascent blackout, also called deep water blackout, is caused
Drowning
Brazilian free-diver and presenter of TV series "APNEIA"
"APNEIA", freediving instructor trainer, international fashion and underwater model, conservationist, and TV personality. She has nine freediving records
Flavia_Eberhard
Toxic effects of breathing oxygen at high partial pressures
maint: deprecated archival service (link) Shykoff, Barbara E (2007). "Performance of various models in predicting vital capacity changes caused by breathing
Oxygen_toxicity
German manufacturer of breathing equipment
(2022-08-02). "Dräger launches BG ProAir for longer firefighting operations". International Fire and Safety Journal. Retrieved 2025-04-29. Devonshire, James (2024-09-18)
Dräger_(company)
Diving incident in the Maldives
were recovered; those found deepest in the cave were recovered by an international rescue team organized by the Divers Alert Network. Dhekunu Kandu Cave
2026 Dhekunu Kandu cave diving incident
2026_Dhekunu_Kandu_cave_diving_incident
Underwater diving breathing gas supplied from the surface
diving:[citation needed] Technically, atmospheric suit diving, scuba diving and freediving are also "surface oriented", but are not "surface-supplied".[citation
Surface-supplied_diving
Chamber for transporting divers vertically through the water
with a battery power supply, and a location transponder working on the international standard 37.5 kHz. The bell may also have viewports and a medical lock
Diving_bell
Anglo-Irish scientist (1627–1691)
Mondiale des Activités Subaquatiques (CMAS) Performance Freediving International (PI) Scuba Schools International (SSI) Recreational scuba certification agencies
Robert_Boyle
Hyperbaric pressure vessel for human occupancy used in diving operations
adapt to hyperbaric conditions and decompression routines and test their performance under pressure. to treat divers for decompression sickness (recompression
Diving_chamber
Estimation of risk associated with exposure to a given set of hazards
criterion have been previously assessed quantitatively by national and international health agencies. For non-cancer health effects, the terms reference
Risk_assessment
Water current moving away from shore
positioning system Underwater acoustic communication Freediving Activities Aquathlon Apnoea finswimming Freediving Haenyeo Pearl hunting Ama Snorkeling Spearfishing
Rip_current
Danish freediver, record holder and author
health and performance via breathing, breath holding and mental training techniques. Combining yoga and his knowledge of physiology in freediving, Severinsen
Stig_Severinsen
Underwater diving to a depth beyond the norm
underlies atmospheric pressure. Not included are the differing ranges of freediving – without breathing during a dive. Deep diving has more hazards and greater
Deep_diving
Special forces unit of the Australian Army
first battle honour since the end of the Vietnam War for outstanding performance during the Shah Wali Kot Offensive in Afghanistan from May to June 2010
Special_Air_Service_Regiment
2022 film by James Cameron
and art director Aashrita Kamath. Kirk Krack, founder of Performance Freediving International, worked as a free-diving trainer for the cast and crew for
Avatar:_The_Way_of_Water
Portable apparatus to recycle breathing gas
Diving International, 1995. Gant, Nicholas; van Waart, Hanna; Ashworth, Edward T.; Mesley, Peter; Mitchell, Simon J. (December 2019). "Performance of cartridge
Rebreather
Chinese military unit
positioning system Underwater acoustic communication Freediving Activities Aquathlon Apnoea finswimming Freediving Haenyeo Pearl hunting Ama Snorkeling Spearfishing
7th Marine Brigade (PLA Navy Marine Corps)
7th_Marine_Brigade_(PLA_Navy_Marine_Corps)
Topics referred to by the same term
FitzPatrick Institute of African Ornithology Performance Freediving International, a freediving organization PF International Kart Circuit, a kart circuit in England
PFI
Surface waves generated by wind on open water
Yolanda Cossio. ISBN 978-0495391937. International Towing Tank Conference (ITTC), retrieved 11 November 2010 International Ship and Offshore Structures Congress
Wind_wave
Swedish and American marine biologist and NASA astronaut
In 2016, Meir participated in ESA CAVES, a training course in which international astronauts train in a space-analogue cave environment. Meir launched
Jessica_Meir
Scientific study of the ocean
The earliest international organizations of oceanography were founded at the turn of the 20th century, starting with the International Council for the
Oceanography
Underwater assault rifle
positioning system Underwater acoustic communication Freediving Activities Aquathlon Apnoea finswimming Freediving Haenyeo Pearl hunting Ama Snorkeling Spearfishing
QBS-06
English Tudor warship (1511–1545)
contributor, in conjunction with the efficiency of the sails, to good sailing performance. This hull shape can certainly explain the reported good sailing qualities
Mary_Rose
Mystic-class deep-submergence rescue vehicle
positioning system Underwater acoustic communication Freediving Activities Aquathlon Apnoea finswimming Freediving Haenyeo Pearl hunting Ama Snorkeling Spearfishing
DSRV-2_Avalon
Cylindrical container for storing pressurised gas
Cylinders may have additional requirements placed on design and or performance from independent testing agencies such as Underwriters Laboratories (UL)
Gas_cylinder
Canadian astronaut (born 1959)
flown two Space Shuttle missions and also served as commander of the International Space Station (ISS). Prior to his career as an astronaut, he served
Chris_Hadfield
US Marine Corps special forces unit
positioning system Underwater acoustic communication Freediving Activities Aquathlon Apnoea finswimming Freediving Haenyeo Pearl hunting Ama Snorkeling Spearfishing
Marine_Raider_Regiment
Submersible that traveled to the Challenger Deep
Archived from the original on 15 April 2012. Retrieved 8 May 2012. "Performance Under Pressure – Off-the-shelf SNAP PAC System controls DEEPSEA CHALLENGER
Deepsea_Challenger
Variation of side-stroke swimming used by United States Navy SEALs
positioning system Underwater acoustic communication Freediving Activities Aquathlon Apnoea finswimming Freediving Haenyeo Pearl hunting Ama Snorkeling Spearfishing
Combat_sidestroke
Vietnamese assault rifle
classification and definition for assault rifle, while the majority of internationally-equivalent assault rifles are formally designated as submachine guns
STV_rifle
Equipment designed to help protect an individual from hazards
developed at the European or international level by the European Committee for Standardization (CEN, CENELEC) and the International Organization for Standardization
Personal_protective_equipment
Crewed submersible owned by Ifremer
positioning system Underwater acoustic communication Freediving Activities Aquathlon Apnoea finswimming Freediving Haenyeo Pearl hunting Ama Snorkeling Spearfishing
Nautile
Italian manufacturer of high pressure gas storage cylinders
positioning system Underwater acoustic communication Freediving Activities Aquathlon Apnoea finswimming Freediving Haenyeo Pearl hunting Ama Snorkeling Spearfishing
Faber_Industrie_S.p.A.
Elevated body temperature due to failed thermoregulation
produces or absorbs more heat than it dissipates. According to the International Emergency Medicine Education Project, severe hyperthermia (body temperature
Hyperthermia
Diving mode and decompression technique
equipment is used to control the risk, that require consistently correct performance by all the members of an extended diving team. The combination of relatively
Saturation_diving
Canadian astronaut, circled the Moon in 2026 (born 1976)
Mondiale des Activités Subaquatiques (CMAS) Performance Freediving International (PI) Scuba Schools International (SSI) Recreational scuba certification agencies
Jeremy_Hansen
French geologist who invented the pressurised caisson (1801–1867)
Mondiale des Activités Subaquatiques (CMAS) Performance Freediving International (PI) Scuba Schools International (SSI) Recreational scuba certification agencies
Jacques_Triger
First ironclad of the US Navy, 1861–1862
Reed, Sir Edward James (1869). Our Iron-Clad Ships: Their Qualities, Performances, and Cost. With Chapters on Turret Ships, Iron-Clad Rams &c. London:
USS_Monitor
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PERFORMANCE FREEDIVING-INTERNATIONAL
PERFORMANCE FREEDIVING-INTERNATIONAL
PERFORMANCE FREEDIVING-INTERNATIONAL
PERFORMANCE FREEDIVING-INTERNATIONAL
PERFORMANCE FREEDIVING-INTERNATIONAL
PERFORMANCE FREEDIVING-INTERNATIONAL
PERFORMANCE FREEDIVING-INTERNATIONAL
PERFORMANCE FREEDIVING-INTERNATIONAL
PERFORMANCE FREEDIVING-INTERNATIONAL
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