In this episode, we dive into the concept of "good enough" in diving and how it relates to decision-making, risk, and safety. We explore why terms like "safe" and "good" are subjective and often influenced by context, experience, and social pressures, rather than absolutes. Using real-life examples, we discuss how divers weigh trade-offs between efficiency and thoroughness, balancing time, money, and risk to make decisions in uncertain situations. By understanding the biases and constraints that shape our choices, we can better assess what "good enough" means in different scenarios and improve through shared stories and context-rich learning.

Original blog: Spiderman drawing video: https://youtu.be/x9wn633vl_c

Blog from Steve Shorrock: https://humanisticsystems.com/2016/12/05/the-varieties-of-human-work/

Efficiency-Thouroughness Trade Off: http://erikhollnagel.com/ideas/etto-principle/index.html

Latent Pathogens from James Reason: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1117770/

Outcome bias: https://en.wikipedia.org/wiki/Outcome_bias

Tags: English, Gareth Lock

In this episode, we explore how decision-making under uncertainty plays a crucial role in scuba diving, drawing insights from Prospect Theory and real-life scenarios. We discuss how psychological factors, like loss aversion, influence divers to take risks they might otherwise avoid—whether it's diving with faulty gear after weeks of being unable to dive or dealing with pressures during high-profile expeditions. Highlighting examples from both individual dives and operational standards in dive centers, we examine the balance between minimizing loss and managing uncertainty. Finally, we emphasize the importance of teamwork, robust communication, and standardization to mitigate risks, ensuring safer and more informed diving decisions.

Original blog: DOSPERT Study: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=1301089

Near death experience in Truk lagoon: https://www.scubaboard.com/community/threads/complacency-kills-its-not-just-an-empty-threat.567481/

Tags:  English, Decision Making, Gareth Lock, Human Factors, Risk

In this episode, we explore how risk is perceived and managed in diving, where emotions, biases, and mental shortcuts often outweigh logic and statistics. Diving fatalities are statistically rare, but those numbers don’t resonate emotionally—our decisions are more influenced by stories and personal experiences. Through real-life examples, we unpack biases like availability bias, outcome bias, and the “turkey illusion,” showing how these distort our understanding of risks. The discussion also highlights strategies for improving risk management, such as using checklists, planning and debriefing effectively, and sharing experiences to enhance collective learning. Join us to rethink how we approach uncertainty and decision-making in diving and beyond.

Original blog: https://www.thehumandiver.com/blog/riskoffatality

Links: Fatalities COnference Procceedings: https://www.diversalertnetwork.org/files/Fatalities_Proceedings.pdf

Numbers don;t have the same emotional relevance as stories: https://hbr.org/2003/06/storytelling-that-moves-people

Risk of dying from a shark attack: https://www.floridamuseum.ufl.edu/shark-attacks/odds/compare-risk/death/

Behavioural economics: https://www.behavioraleconomics.com/resources/introduction-behavioral-economics/

Prospect theory: https://www.behavioraleconomics.com/resources/mini-encyclopedia-of-be/prospect-theory/

Video about normalisation of deviance: https://vimeo.com/174875861

4 T’s of risk management: https://www.facebook.com/groups/1612046102342961/permalink/2160646497482916/

How it makes sense for “stupid” decisions: https://www.facebook.com/gareth.lock.5/videos/10155465887236831/

Tags: English, Gareth Lock

How do you measure safety in diving? This episode dives into a real story of a dive team that adapted to an emerging safety risk when two divers, certified but inexperienced in drysuits and challenging conditions, showed signs of stress. Through situational awareness, communication, and teamwork, the team adjusted their plan, choosing a safer dive site where the less experienced divers could build confidence. The story highlights how safety isn’t about luck or strict rule-following but proactive decision-making and collaboration. We explore how divers can develop the skills to create safety and why “nothing happening” often means someone made it happen.

Original blog: https://www.thehumandiver.com/blog/safety-is-nothingness

Tags:  English, Decision Making, Gareth Lock, Human Factors, Leadership, Safety, Teamwork

In this episode, we explore the decision-making challenges in diving, sharing a personal story of risky dives and lessons learned. A diver reflects on their early diving experiences, from breaking training depth limits to encountering equipment failures at 30m, and how a lack of knowledge and overconfidence contributed to risky choices. We discuss the importance of understanding context when evaluating incidents, avoiding hindsight bias, and learning from mistakes to improve safety. Diving involves inherent risks, but by fostering curiosity, sharing lessons, and acknowledging uncertainties, we can create a safer and more informed diving community.

Original blog: https://www.thehumandiver.com/blog/responsible-but-not-informed

Tags:  English, Decision Making, Gareth Lock, Human Factors, Risk Management

In this episode, we dive into cognitive dissonance—the psychological discomfort of confronting facts that challenge our beliefs—and how it impacts decision-making and safety in diving. Drawing on insights from Black Box Thinking by Matthew Syed and examples from aviation, justice, and diving, we explore why even highly educated individuals can resist change to protect their reputation. From misconceptions about Nitrox and gas planning to biases in equipment and training preferences, we examine common examples in diving and discuss how human factors can improve safety. We also share practical steps to reduce cognitive dissonance, embrace learning from failure, and foster open-mindedness in the diving community.

Original blog: https://www.thehumandiver.com/blog/cognitive-dissonance

Links: Ditching in the Hudson of Cactus 1549: https://en.wikipedia.org/wiki/US_Airways_Flight_1549

Story about cult foollowers expecting a UFO: https://www.minnpost.com/second-opinion/2011/04/when-facts-fail-ufo-cults-birthers-and-cognitive-dissonance

“Unintended co-ejaculators”: https://ethicsunwrapped.utexas.edu/cognitive-dissonance-case-unindicted-co-ejaculator

Examples of cognitive dissonance: https://en.wikipedia.org/wiki/Cognitive_dissonance

Tags:  English, Decision Making, Gareth Lock, Human Factors

In this episode, we explore the gap between knowledge and action, focusing on how even small, intentional changes can lead to significant improvements in safety and performance. Drawing from examples like the WHO Safe Surgical Checklist and lessons from diving, we highlight the importance of applying what we know—whether through simple tools like checklists and debriefs or by understanding decision-making and systemic issues. Alongside a personal story about working with a coach to turn knowledge into impactful action, we challenge listeners to reflect: what will you do to turn your insights into meaningful change?

Original blog: https://www.thehumandiver.com/blog/anotherbrickinthewall

Links: CAP 737 http://publicapps.caa.co.uk/modalapplication.aspx?appid=11&mode=detail&id=6480

IOGP Doc 502 https://www.iogp.org/bookstore/product/guidelines-for-implementing-well-operations-crew-resource-management-training/

Non-technical skills for surgeons: https://www.rcsed.ac.uk/professional-support-development-resources/learning-resources/non-technical-skills-for-surgeons-notss

The Castle: http://www.thisiscolossal.com/2018/02/the-castle-by-jorge-mendez-blake/

World Health Organisation Safe Surgical Checklist: https://www.nejm.org/doi/full/10.1056/NEJMsa0810119

Semmelweis: https://en.wikipedia.org/wiki/Ignaz_Semmelweis

Distancing through differencing: https://www.researchgate.net/publication/292504703_Distancing_through_differencing_An_obstacle_to_organizational_learning_following_accidents

Tags:  English, Decision-Making, Gareth Lock, Human Factors, Non-Technical Skills

In this episode, we delve into the complexities of managing risk and uncertainty in diving, challenging the notion that accidents are "entirely predictable." Unlike measurable risks, diving involves countless variables that create uncertainty, often managed through mental shortcuts and biases. We discuss how hindsight bias, overconfidence, and peer pressure can cloud judgment, leading to poor decisions. Effective feedback, teamwork, and tools like checklists can reduce uncertainty, while debriefs and learning from others’ mistakes are crucial for improvement. Tune in to explore how divers can navigate uncertainty to enhance safety and performance in this high-stakes environment.

Original blog: https://www.thehumandiver.com/blog/uncertainty-vs-predictable

Links: Risk vs Uncertainty: http://www.mindtherisk.com/literature/67-risk-savvy-by-gerd-gigerenzer

Thinking, Fast and Slow: https://en.wikipedia.org/wiki/Thinking,_Fast_and_Slow

Blog about the Dunning Kruger effect: https://www.thehumandiver.com/blog/incompetent-and-unaware-you-don-t-know-what-you-don-t-know

Blog about biases: https://www.humaninthesystem.co.uk/blog/i-am-biased-you-are-biased-we-are-all-biased

Tags:  English, Decision Making, Gareth Lock, Risk

The diving industry faces challenges in maintaining high safety standards due to a lack of effective feedback mechanisms and a fear of reprisal for reporting substandard practices. Feedback is essential for improving performance and preventing dangerous "normalization of deviance," but it’s often viewed as blame rather than an opportunity for learning. Without proper acknowledgment or action from agencies, divers and instructors lose trust in the system, leading to fewer reports and greater risks. To protect the self-regulating nature of the industry, the community must embrace constructive feedback, report unsafe practices, and demand accountability from agencies to ensure safety and uphold standards.

Original blog: https://www.thehumandiver.com/blog/standard-you-accept

Links: Blog about normalisation of deviance: https://www.thehumandiver.com/blog/being-a-deviant-is-normal

Willful blindness: https://www.ted.com/talks/margaret_heffernan_the_dangers_of_willful_blindness

​Case study from healthcare in the US: https://news.aamc.org/patient-care/article/best-response-medical-errors-transparency/

Tags:  English, Gareth Lock, Just Culture, Reporting

When discussing diving incidents, it’s vital to shift away from blame and hindsight bias and instead foster a culture of open dialogue to understand why decisions made sense at the time. Often, divers are doing their best with the resources, training, and information available, but situational awareness and decision-making are shaped by incomplete data, personal experience, and environmental factors. Criticism without context or constructive feedback doesn’t improve safety or learning; instead, it deters people from sharing critical insights. By embracing a "just culture," the diving community can better explore the underlying factors behind incidents, address systemic issues, and create meaningful opportunities for growth and safety improvement.

Original blog: https://www.thehumandiver.com/blog/cannot-improve-do-not-understand

Links: Report of the death of CCR diver: https://cognitasresearch.files.wordpress.com/2015/05/dillon-2015-findings-in-the-inquest-into-the-death-of-philip-gray.pdf

Tags: English, Gareth Lock, Just Culture

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