Welcome to the Punkfish Library! At the top you will find our recommendations with a short summary, below that the full catalogue of all sources, sorted by topic. Wherever possible we link to freely available full texts.
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Decompression models, algorithms, gradient factors, deep stops and dive computers.
Author(s): Zaferes, Andrea
Year: 1997
A brief, readable discussion on how immune reactions might play a key role in what divers call “the hit.” The article suggests that it’s not just bubbles causing trouble, but also the body’s own inflammatory response that can turn a dive into a decompression incident.
Citation: Zaferes, A. (1997). Rethinking the hit. Immersed – The International Technical Diving Magazine, Spring 1997.
Author(s): Dunford, R.G.
Year: 2020
This study analyzes recorded depth-time profiles from divers and compares them to reported decompression sickness cases, aiming to describe the relationship between real dive exposure patterns and observed DCS incidents.
Citation: Dunford MS, R. G., Denoble, P. D., Forbes, R. B., Pieper DrPh, C. F., Howle, L. E., Vann, R. D., America, D., & Carolina, N. U. (2020). A study of decompression sickness using recorded depth-time profiles (Vol. 47, Issue 1).
Author(s): Doolette, David et al
Year: 2011
An experimental U.S. Navy study showing that shifting decompression time from shallow to deeper stops increased DCS incidence in controlled dives. This frequently cited and heavily debated work remains a key reference in discussions about “deep stop” strategies.
Citation: Doolette, D. J., Gerth, W. A., & Gault, K. A. (2011). Redistribution of Decompression stop time from shallow to deep stops increases incidence of decompression sickness in air decompression dives.
Author(s): Doolette, David et al
Year: 2015
NEDU report comparing decompression efficiency between trimix and heliox bounce dives. Findings show no measurable advantage of adding nitrogen to helium-oxygen mixtures for decompression efficiency. Frequently cited in discussions on gas choice and decompression theory.
Citation: Doolette, D. J., Gault, K. A., & Gerth, W. A. (2015). Decompression from He-N2-O2 (Trimix) bounce dives is not more efficient than from He-O2 (Heliox) bounce dives.
Author(s): Cialoni, Danilo et al
Year: 2017
Open-access study analyzing data from the DAN Europe Diving Safety Laboratory (DSL). It examines how various dive risk factors relate to post-dive venous gas bubble formation and decompression illness in recreational scuba diving.
Citation: Cialoni, D., Pieri, M., Balestra, C., & Marroni, A. (2017). Dive risk factors, Gas Bubble formation, and decompression illness in recreational SCUBA diving: Analysis of DAN Europe DSL data base. Frontiers in Psychology, 8(SEP).
Author(s): Mitchell, Simon J.; Doolette, David J.
Year: 2013
A compact introduction to technical diving: breathing gas mixtures, equipment configurations, and the planning and execution of deep, long dives. Written for physicians – ideal for putting tech diving into proper context.
Citation: Mitchell, S. J., & Doolette, D. J. (2013). Recreational technical diving part 1: an introduction to technical diving methods and activities. Diving and Hyperbaric Medicine, 43(2), 86–93. PMID: 23813462
Author(s): Doolette, David J.; Mitchell, Simon J.
Year: 2013
The evidence behind decompression practice in technical diving: many algorithm modifications are driven by anecdote. The authors test deep stops, gas switches and helium mixtures against the scientific data – essential reading for tech instructors.
Citation: Doolette, D. J., & Mitchell, S. J. (2013). Recreational technical diving part 2: decompression from deep technical dives. Diving and Hyperbaric Medicine, 43(2), 96–104. PMID: 23813463
Author(s): De Ridder, Sven et al.
Year: 2023
The Belgian Navy evaluated gradient factors for its dive computers. Key message: the common 30/70 setting produces deep first stops that load the slower tissues more – a low GF-low is not automatically safer. Symmetrical settings are recommended.
Citation: De Ridder, S., Pattyn, N., Neyt, X., & Germonpré, P. (2023). Selecting optimal air diving gradient factors for Belgian military divers: more conservative settings are not necessarily safer. Diving and Hyperbaric Medicine, 53(3), 251–258. doi: 10.28920/dhm53.3.251-258
Author(s): Gouin, Emmanuel; Dugrenot, Emmanuel; Gardette, Bernard
Year: 2025
Interviews with eight divers who have gone deeper than 200 m. The biggest challenge was not HPNS but decompression. A rare insight into the planning and limits of extreme deep dives.
Citation: Gouin, E., Dugrenot, E., & Gardette, B. (2025). Extremely deep bounce dives: planning and physiological challenges based on the experiences of a sample of French-speaking technical divers. Diving and Hyperbaric Medicine, 55(2), 203–210. doi: 10.28920/dhm55.2.203-210
Bubble formation, endothelium, inflammation, preconditioning and the body's response to pressure.
Author(s): Lindholm, Peter; Lundgren, Claes E. G.
Year: 2009
The classic review of breath-hold diving physiology: the diving response, limits of breath-hold time, pressure effects at depth and the risk of hypoxia on ascent. Most deaths occur among less-trained recreational breath-hold divers and spearfishers.
Citation: Lindholm, P., & Lundgren, C. E. G. (2009). The physiology and pathophysiology of human breath-hold diving. Journal of Applied Physiology, 106(1), 284–292. doi: 10.1152/japplphysiol.90991.2008
Inert gas narcosis, oxygen toxicity, CO2, gas density, nitrox, helium and more.
Author(s): Josef T. Hoyt, Simon Mitchell et al.
Year: 2025
New guideline for O2 exposure at 1,3 bar pO2
Citation: Hoyt JT, Murphy FG, Pollock NW, Kernagis D, Bird N, Menduno M, Bright J, Mitchell SJ. Revised guideline for central nervous system oxygen toxicity exposure limits when using an inspired PO2 of 1.3 atmospheres. Diving Hyperb Med. 2025 Sep 30;55(3):262-270. doi: 10.28920/dhm55.3.262-270. PMID: 40986922; PMCID: PMC12500339.
Author(s): Anthony, Gavin; Mitchell, Simon J.
Year: 2016
The foundational work on gas density: above about 6 g/L respired gas density the risk of dangerous CO2 retention rises sharply – on rebreathers as well as open circuit. Today's common recommendations (ideally below 5.2 g/L, maximum 6.2 g/L) derive from it. The link leads to the full proceedings.
Citation: Anthony, G., & Mitchell, S. J. (2016). Respiratory physiology of rebreather diving. In: Pollock, N. W., Sellers, S. H., & Godfrey, J. M. (Eds.), Rebreathers and Scientific Diving. Proceedings of NPS/NOAA/DAN/AAUS Workshop 2015 (pp. 66–79). Durham, NC.
Author(s): DDRC Healthcare (Anthony, Gavin)
Year: 2023
A short, practical summary of gas density research for recreational divers: why dense breathing gas impairs CO2 elimination and why you should not rely on noticing CO2 symptoms in time. With clear limits for dive planning.
Citation: DDRC Healthcare (2023). Gas Density and SCUBA. Based on a presentation by Gavin Anthony. https://www.ddrc.org/gas-density-and-scuba/
Decompression illness, PFO, fitness to dive, barotrauma and hyperbaric therapy.
Author(s): SPUMS and UKDMC - David Smart, Simon Mitchell et al.
Year: 2025
Every now and then the diving community discusses if a medical check for diving fitness should include checking for a PFO. The scientific and practical position of the leading hyperbaric physicians worldwide is absolutely clear: No. A check is only recommended after very specific symptoms of DCS have happend after dives generally considered as safe.
Citation: Smart D, Wilmshurst P, Banham N, Turner M, Mitchell SJ. Joint position statement on atrial shunts (persistent [patent] foramen ovale and atrial septal defects) and diving: 2025 update. South Pacific Underwater Medicine Society (SPUMS) and the United Kingdom Diving Medical Committee (UKDMC). Diving Hyperb Med. 2025 Mar 31;55(1):51-55. doi: 10.28920/dhm55.1.51-55. PMID: 40090026; PMCID: PMC12043516.
Author(s): Simon Mitchell
Year: 2024
This review explains decompression illness as including both decompression sickness (DCS) and arterial gas embolism (AGE). It outlines their distinct bubble sources, shared mechanisms of tissue injury, diverse clinical symptoms, and provides an overview of pathophysiology, prevention, and treatment strategies.
Citation: Mitchell SJ. Decompression illness: a comprehensive overview. Diving Hyperb Med. 2024 Mar 31;54(1Suppl):1-53. doi: 10.28920/dhm54.1.suppl.1-53. PMID: 38537300; PMCID: PMC11168797.
Author(s): Wilmshurst, Peter
Year: 2019
A cardiologist's review of immersion pulmonary oedema (IPE): how immersion, cold, exertion and cardiovascular factors combine to push fluid into the lungs. An often overlooked condition that dive instructors should know.
Citation: Wilmshurst, P. (2019). Immersion pulmonary oedema: a cardiological perspective. Diving and Hyperbaric Medicine, 49(1), 30–40. PMID: 30856665
Author(s): Diver Medical Screen Committee / UHMS
Year: 2026
The internationally agreed medical questionnaire for dive students, used by most training agencies. The page provides the current version in several languages, together with the guidance for physicians.
Citation: Diver Medical Screen Committee (2026). Diver Medical | Participant Questionnaire. Recreational Diving Medical Screening System. Undersea & Hyperbaric Medical Society.
Author(s): Diver Medical Screen Committee / UHMS
Year: 2023
Spanish edition of the physician guidance accompanying the diver medical questionnaire: which conditions increase the risk of decompression sickness, pulmonary barotrauma or loss of consciousness underwater, and how to assess them.
Citation: Diver Medical Screen Committee (2023). Guía médica de buceo para el médico (versión 2023-05-31). Undersea & Hyperbaric Medical Society.
Prevention, first aid, guidelines and emergency management in diving.
Author(s): Jüttner, Björn et al
Year: 2023
Definiert den Tauchunfall als potenziell lebensbedrohliches oder gesundheitsschädigendes Ereignis durch Druckabfall beim Tauchen. Beschreibt empfohlene Maßnahmen von Laien bis Ärzt:innen – darunter Erste-Hilfe mit 100 % Sauerstoff, Immobilisation, Flüssigkeitsgabe, Telefon-Konsultation mit Tauchmediziner – sowie Hyperbare Sauerstofftherapie bei schweren Fällen. Stützt sich auf nationale Konsensentwicklung S2k.
Citation: Leitlinie Tauchunfall (S2k) – GTÜM et al. (veröffentlicht Dezember 2022, gültig bis 30. November 2027)
Author(s): Jüttner, Björn et al
Year: 2023
Defines a diving accident as a potentially life-threatening or health-threatening event due to ambient pressure reduction during diving. Outlines recommended actions by lay rescuers and medical personnel – including onsite 100 % oxygen, immobilization, fluid administration, teleconsultation with a dive medicine specialist – and hyperbaric oxygen therapy for severe cases. Developed via national consensus (S2k methodology).
Citation: Guideline for Diving Accidents (S2k) – GTÜM et al. (published December 2022, valid until November 30, 2027)
Author(s): Mitchell, Simon et al.
Year: 2012
Expert consensus outlining best practices for rescuing an unresponsive compressed-gas diver. Covers underwater assessment, ascent procedures, surface management, and decision-making to balance drowning prevention with rescuer safety.
Citation: Mitchell, S. J., et al. (2012) – Recommendations for Rescue of a Submerged Unresponsive Compressed-Gas Diver
Author(s): Beatty, Paul et al.
Year: 2024
Review of common diving disorders and their incidence in recreational and military diving. It identifies physiological signals (heart rate, blood pressure, oxygen saturation, respiration, temperature) that could feed a future real-time underwater early-warning system.
Citation: Beatty, P., Evans, W., Gravelyn, S., Tumperi, M., Daubon, D., & Veith, A. (2024). Physiological monitoring to prevent diving disorders. Frontiers in Physiology, 15. doi: 10.3389/fphys.2024.1517361
Author(s): Mitchell, Simon J. et al.
Year: 2018
International expert recommendations on pre-hospital management of decompression illness: diagnosis, first aid, remote consultation with diving physicians, evacuation, the effect of delay to recompression, and in-water recompression. The current reference since the 2004 workshop.
Citation: Mitchell, S. J., Bennett, M. H., Bryson, P., Butler, F. K., Doolette, D. J., Holm, J. R., Kot, J., & Lafère, P. (2018). Pre-hospital management of decompression illness: expert review of key principles and controversies. Diving and Hyperbaric Medicine, 48(1), 45–55. PMID: 29557102
Author(s): Lott, Carsten et al.
Year: 2025
The current European resuscitation guidelines for special circumstances – including drowning, hypothermia and other environmental emergencies. Important for anyone teaching first aid and rescue. We could not confirm whether the full text is freely accessible.
Citation: Lott, C., Karageorgos, V., Abelairas-Gomez, C., Alfonzo, A., Bierens, J., et al. (2025). European Resuscitation Council Guidelines 2025 Special Circumstances in Resuscitation. Resuscitation, 215 Suppl 1, 110753. doi: 10.1016/j.resuscitation.2025.110753
Accident statistics, human factors, error analysis and lessons learned.
Author(s): Denoble, P. J.
Year: 2008
A clear, engaging overview of diving deaths that breaks down the chain of events in nearly a thousand cases to highlight where things went wrong—and why divers actually died.
Citation: Denoble, P., Dear, G. D. L., Pieper, C., & Vann, R. (2008). Common causes of open-circuit recreational diving fatalities.
Author(s): Lock, Gareth
Year: 2019
A must‑read for divers and instructors, this book explains how human factors, decision‑making, and communication shape diving safety. Packed with real case studies and practical lessons, it’s essential for anyone serious about understanding and managing risk underwater.
Citation: Lock, G. (2019). Under Pressure - Diving Deeper with Human Factors.
Author(s): Shreeves, Karl; Buzzacott, Peter; Hornsby, Al; Caney, Mark
Year: 2018
Analysis of 122 fatalities in North America and the Caribbean: 57% involved a medical event. In the non-medical cases, basic safe diving practices had been violated in three out of four deaths – a strong argument for taking standards seriously in training.
Citation: Shreeves, K., Buzzacott, P., Hornsby, A., & Caney, M. (2018). Violations of safe diving practices among 122 diver fatalities. International Maritime Health, 69(2), 94–98. doi: 10.5603/IMH.2018.0014
Author(s): Fock, Andrew W.
Year: 2013
Analysis of 181 closed-circuit rebreather deaths: the estimated fatality rate is about 4 per 100,000 dives – roughly ten times higher than open-circuit scuba. The most common cause was an unsuitable breathing gas leading to loss of consciousness and drowning.
Citation: Fock, A. W. (2013). Analysis of recreational closed-circuit rebreather deaths 1998–2010. Diving and Hyperbaric Medicine, 43(2), 78–85.
Author(s): Tillmans, Frauke et al.
Year: 2026
An up-to-date follow-up on rebreather fatalities (2013–2022): 241 deaths, an estimated 1.8–3.8 per 100,000 dives. The authors stress that incomplete incident reporting hampers better analysis. Free full text may only be available after an embargo.
Citation: Tillmans, F., Saraiva, C., Ferguson, S., Dugrenot, E., & Blogg, S. L. (2026). Recreational and technical rebreather fatalities and diving safety status. Diving and Hyperbaric Medicine, 56(2), 185–190. doi: 10.28920/dhm56.2.185-190
Author(s): Gouin, Emmanuel et al.
Year: 2026
A 15-year review of 124 injured technical divers in France: 84% had decompression sickness, notably often with musculoskeletal involvement. The injury pattern differs clearly from recreational diving. Free full text may only be available after an embargo.
Citation: Gouin, E., Caillard, A., Veses, C., et al. (2026). Technical diving accidents in France: a 15-year retrospective study reporting a high prevalence of musculoskeletal decompression sickness. Diving and Hyperbaric Medicine, 56(2), 125–136. doi: 10.28920/dhm56.2.125-136
Author(s): Divers Alert Network
Year: 2025
DAN's annual report on fatalities, injuries and incidents in recreational diving, here covering 2020. Includes case studies and statistics – one of the most important freely available sources for accident analysis in teaching.
Citation: Divers Alert Network (2025). DAN Annual Diving Report 2022 Edition: A report on 2020 diving fatalities, injuries, and incidents. Durham, NC: Divers Alert Network.
Equipment, technology, rebreathers, configurations and innovations.
Author(s): Mitchell, Simon J.; Pollock, Neal W.
Year: 2023
The 28 consensus statements of Rebreather Forum 4 (2023) on safety, training, equipment and incident analysis in rebreather diving. Short, current and backed by the leading experts – the reference for anyone teaching or diving CCR.
Citation: Mitchell, S. J., & Pollock, N. W. (2023). Rebreather Forum Four consensus statements. Diving and Hyperbaric Medicine, 53(2), 142–146. doi: 10.28920/dhm53.2.142-146
Author(s): Vann, Richard D.; Denoble, Petar J.; Pollock, Neal W. (Eds.)
Year: 2014
The 324-page proceedings of Rebreather Forum 3 (2012): technology, physiology, training, operations and accident statistics of rebreathers, compiled by leading specialists. A reference work to browse.
Citation: Vann, R. D., Denoble, P. J., & Pollock, N. W. (Eds.) (2014). Rebreather Forum 3 Proceedings. Durham, NC: AAUS/DAN/PADI.
Training, planning and conducting dives, freediving.
Author(s): Vrdoljak, Dario; Dujić, Željko; Foretić, Nikola
Year: 2024
Case study of one experienced freediver measuring muscle oxygen saturation and haemoglobin in the thigh across different freediving disciplines. An interesting look at muscle physiology during breath-hold diving, though with a single subject the results cannot be generalised.
Citation: Vrdoljak, D., Dujić, Ž., & Foretić, N. (2024). Muscular Oxygen Saturation and Hemoglobin Concentration during Freediving: A Case Study. Oxygen, 4(3). doi: 10.3390/oxygen4030016
Author(s): Downey, Greg
Year: 2024
An anthropologist describes how freediving training gradually transforms the body – psychologically, neurologically and physiologically. Worth reading for freediving instructors: progress takes time because the body adapts through patient, sustained practice.
Citation: Downey, G. (2024). The incremental transformation of the body through freediving: A biocultural approach to reflexive bodily practices. Ethos, 52, 225–240. doi: 10.1111/etho.12430
Author(s): Bakri, Syamsul; Suharjana
Year: 2018
Small conference study of 20 beginner freedivers testing whether dry static apnea training on land extends underwater breath-hold time. A simple approach but methodologically weak – best read as inspiration for training practice.
Citation: Bakri, S., & Suharjana (2018). The Analysis of Diving Resistance by Using Dry Static Method for Freediving Beginners. Proceedings of the Yogyakarta International Seminar on Health, Physical Education, and Sport Science (YISHPESS-CoIS 2018). Atlantis Press.
Author(s): Naval Sea Systems Command (NAVSEA)
Year: 2016
The US Navy's standard reference: diving physics, physiology, air and mixed-gas diving, rebreathers, decompression tables and treatment of diving injuries – nearly 1,000 pages, approved for public release. A revision ('Revision 7 Change A') followed in 2018.
Citation: Naval Sea Systems Command (2016). U.S. Navy Diving Manual, Revision 7 (SS521-AG-PRO-010). Washington, DC: NAVSEA. Approved for public release.
Author(s): Ranapurwala, Shabbar I. et al.
Year: 2017
Field study with more than 1,000 recreational divers: those who use a pre-dive checklist have fewer mishaps caused by equipment problems and human error. Solid evidence for consistently training the buddy check.
Citation: Ranapurwala, S. I., et al. (2017). Mishaps and unsafe conditions in recreational scuba diving and pre-dive checklist use: a prospective cohort study. Injury Epidemiology. doi: 10.1186/s40621-017-0113-z
Author(s): Downey, Greg
Year: 2024
How culture and biology interact in freediving training: regular practice reshapes the nervous system, muscles and lung capacity and strengthens the diving response. A freely available companion to Downey's article in 'Ethos'.
Citation: Downey, G. (2024). Skill building in freediving as an example of embodied culture. Philosophical Transactions of the Royal Society B: Biological Sciences. doi: 10.1098/rstb.2023.0150
Knowledge about marine life, ecosystems and biodiversity.
Author(s): Bagusche, Frauke
Year: 2019
Wunderschönes Buch einer begeisterten Meeresbiologin über ganz verschiedene Aspekte der Meeresökologie. Was hat es mit der Biolumineszenz des Planktons auf sich? Wie ist das mit der Fortpflanzung unter Meeresbewohnern? Und welchen Einfluss haben Menschen auf das Meer durch Mikroplastik, Verschmutzung, Überfischung, globale Erwärmung und vieles mehr? Ein muss für jeden, der sich für das Meer interessiert.
Citation: Bagusche, Frauke. Das blaue Wunder: Warum das Meer leuchtet, Fische singen und unsere Beziehung zum Meer so besonders ist. 2019.
Author(s): maribus gGmbH (Hrsg.)
Year: 2026
The latest World Ocean Review is devoted to marine biodiversity: what it is, why it is vital for ecosystems and people, and what threatens it. Superbly presented and free as PDF or in print, in German and English.
Citation: maribus (Hrsg.) (2026). World Ocean Review 9: Marine Biodiversität – das vitale Fundament unserer Meere. Hamburg: maribus.
Author(s): maribus gGmbH (Hrsg.)
Year: 2010–2024
The complete World Ocean Review series: state of the oceans, fisheries, marine resources, coasts, polar regions, sustainable use and the ocean's role in climate protection. All volumes are free as PDF or in print, in German and English.
Citation: maribus (Hrsg.) (2010–2024). World Ocean Review, Bände 1–8. Hamburg: maribus.
Author(s): Heinrich-Böll-Stiftung Schleswig-Holstein et al. (Hrsg.)
Year: 2017
18 short articles and more than 50 graphics on the state of the oceans: overfishing, pollution, plastic, warming, acidification and declining biodiversity – and what can be done about it. Ideal material for presentations and teaching (German).
Citation: Heinrich-Böll-Stiftung Schleswig-Holstein, Heinrich-Böll-Stiftung, Kieler Exzellenzcluster Ozean der Zukunft & Le Monde diplomatique (Hrsg.) (2017). Meeresatlas: Daten und Fakten über unseren Umgang mit dem Ozean.
Author(s): Souter, David et al. (Eds.), GCRMN / ICRI
Year: 2021
The global report on the status of coral reefs, based on almost two million observations at more than 12,000 sites in 73 countries (1978–2019). A powerful illustration of the toll that marine heatwaves take on reefs.
Citation: Souter, D., Planes, S., Wicquart, J., Logan, M., Obura, D., & Staub, F. (Eds.) (2021). Status of Coral Reefs of the World: 2020. Global Coral Reef Monitoring Network (GCRMN) / International Coral Reef Initiative.
All sources of our reference library – mostly English-language scientific literature.